CA2021413C - Water-swellable adhesive water stop - Google Patents
Water-swellable adhesive water stopInfo
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- CA2021413C CA2021413C CA 2021413 CA2021413A CA2021413C CA 2021413 C CA2021413 C CA 2021413C CA 2021413 CA2021413 CA 2021413 CA 2021413 A CA2021413 A CA 2021413A CA 2021413 C CA2021413 C CA 2021413C
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Abstract
The water-swellable adhesive water stop of the invention is advantageous in respect of the improved workability and high water-stopping power as a consequence of the unique formulation of the rubber composition from which the water stop is prepared by shaping and vulcanization. The rubber composition comprises: (A) a butyl rubber; (B) a highly water-absorptive resin; (C) an inorganic water-absorbent;
(D) a tackifier; (E) a plasticizer; (F) a vulcanizing agent and, optionally, (G) a basic filler each in a limited amount relative to the component (A). The water stop is further characterized by a tensile strength in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break of at least 300% and degree of swelling in water in the range from 150 to 500%
by weight after immersion in water for 21 days at 23 °C.
(D) a tackifier; (E) a plasticizer; (F) a vulcanizing agent and, optionally, (G) a basic filler each in a limited amount relative to the component (A). The water stop is further characterized by a tensile strength in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break of at least 300% and degree of swelling in water in the range from 150 to 500%
by weight after immersion in water for 21 days at 23 °C.
Description
~O:~I413 WATER-SWELLABLE ADHESIVE WATER STOP
BACKGROUND OF THE INVENTION
The present invention relates to a novel water-swell-able adhesive water stop. More particularly, the inventionrelates to a water-swellable adhesive water stop improved in respect of the workability and capable of exhibiting a high water-stopping efficiency.
A water stop ls a shaped body widely used to prevent leakage of water by filling gap spaces, interstices, cracks, fissures and the like responsible for leakage of water therethrough, for example, in the joints of precast concrete bodies, construction joints of mortar or concrete works, joints in water-supply pipes and the like in civil engineer-ing works and building construction works in general. Asa trend in recent years, in partlcular, so-called water-swellable water stops are highlighted in respect of the high efficiency of water leakage prevention with a capability of complying wlth any subsequent expansion of the joint gaps after the construction works by virtue of the volume increase of the water stop by swelling in water.
The major current in the above mentioned water stops in the prior art is in the use of those of the complete-vulcanization type. A problem in the use of the water stops of this type is in the relatively low working efficiency therewith due to the requirement of a considerably high fastening pressure to completely fill up the gaps in a joint between irregular or rugged surfaces or at a corner portion of concrete bodies because the water stop material usually has a high tensile strength Tb and high compressive elastic resilience. Accordingly, it is eagerly desired to develop a novel water-swellable water stop material improved in this regard.
Besides, known water stops include those formulated with a readily deformable water-resistant material, such as rubbers, plastics, bitumens and the like, as a base. The water stops formulated with these base materials, however, 2û21413 are not always quite satlsfactory in respect of their poor compllance with the changes ln the dimensions of the gaps fllled therewith due to the decrease in the elastic resil-ience or appearance of the phenomenon of creeping after a long time of service so as to cause a loss in the leakage-preventlng power. Water stops of the water-swellable vulcanized-rubber type have also been proposed although they still have a problem to be solved in respect of the poor working efficiency as a consequence of the initial leakage-preventing effect exhibited largely depending on theadhesive and the compressive elastic resilience of the rubber.
On the other hand, water stops formulated with an adheslve butyl rubber are under prevailing use as a water stop for gap-filling applications despite the defects due to the relatively large permanent compression set and poor restorability thereof. Water-swellable adhesive water stops formulated with a butyl rubber have been proposed as an improved modification of the above but they, being of the unvulcanized-rubber type, have a defect in the basic properties that the water stop is susceptible to collapsing under the swelling pressure which the water stop cannot withstand when swollen with water.
SUMMARY OF THE INVENTION
The present invention accordingly has an object to provide an improved water-swellable adhesive water stop of excellent performance by fully overcoming the above describ-ed problems and disadvantages in the conventional water-swellable water stops, which is imparted simultaneously with the good workability possessed by the unvulcanized adhesive butyl rubbers in the prior art and the good leakage preventing power of the water-swellable water stops of the vulcanized-rubber type and capable of exhibiting excellent adhesiveness, relatively small compressive elastic resil-ience, good workability in gap-filling works and high leakage-preventing effect under the surface-contacting 2~2t41:~
BACKGROUND OF THE INVENTION
The present invention relates to a novel water-swell-able adhesive water stop. More particularly, the inventionrelates to a water-swellable adhesive water stop improved in respect of the workability and capable of exhibiting a high water-stopping efficiency.
A water stop ls a shaped body widely used to prevent leakage of water by filling gap spaces, interstices, cracks, fissures and the like responsible for leakage of water therethrough, for example, in the joints of precast concrete bodies, construction joints of mortar or concrete works, joints in water-supply pipes and the like in civil engineer-ing works and building construction works in general. Asa trend in recent years, in partlcular, so-called water-swellable water stops are highlighted in respect of the high efficiency of water leakage prevention with a capability of complying wlth any subsequent expansion of the joint gaps after the construction works by virtue of the volume increase of the water stop by swelling in water.
The major current in the above mentioned water stops in the prior art is in the use of those of the complete-vulcanization type. A problem in the use of the water stops of this type is in the relatively low working efficiency therewith due to the requirement of a considerably high fastening pressure to completely fill up the gaps in a joint between irregular or rugged surfaces or at a corner portion of concrete bodies because the water stop material usually has a high tensile strength Tb and high compressive elastic resilience. Accordingly, it is eagerly desired to develop a novel water-swellable water stop material improved in this regard.
Besides, known water stops include those formulated with a readily deformable water-resistant material, such as rubbers, plastics, bitumens and the like, as a base. The water stops formulated with these base materials, however, 2û21413 are not always quite satlsfactory in respect of their poor compllance with the changes ln the dimensions of the gaps fllled therewith due to the decrease in the elastic resil-ience or appearance of the phenomenon of creeping after a long time of service so as to cause a loss in the leakage-preventlng power. Water stops of the water-swellable vulcanized-rubber type have also been proposed although they still have a problem to be solved in respect of the poor working efficiency as a consequence of the initial leakage-preventing effect exhibited largely depending on theadhesive and the compressive elastic resilience of the rubber.
On the other hand, water stops formulated with an adheslve butyl rubber are under prevailing use as a water stop for gap-filling applications despite the defects due to the relatively large permanent compression set and poor restorability thereof. Water-swellable adhesive water stops formulated with a butyl rubber have been proposed as an improved modification of the above but they, being of the unvulcanized-rubber type, have a defect in the basic properties that the water stop is susceptible to collapsing under the swelling pressure which the water stop cannot withstand when swollen with water.
SUMMARY OF THE INVENTION
The present invention accordingly has an object to provide an improved water-swellable adhesive water stop of excellent performance by fully overcoming the above describ-ed problems and disadvantages in the conventional water-swellable water stops, which is imparted simultaneously with the good workability possessed by the unvulcanized adhesive butyl rubbers in the prior art and the good leakage preventing power of the water-swellable water stops of the vulcanized-rubber type and capable of exhibiting excellent adhesiveness, relatively small compressive elastic resil-ience, good workability in gap-filling works and high leakage-preventing effect under the surface-contacting 2~2t41:~
pressure by the rapld swelling with water to fully comply with separation of the jointed surfaces in the joint after working along with a sufficiently high materlal strength to withstand the swelling pressure which might cause collapsing of the water stop.
Thus, the water-swellable adhesive water stop of the present invention, which has been completed as a result of the extensive investigations undertaken by the inventor, is a shaped and vulcanized body of a composition comprising:
(A) 100 parts by weight of a butyl rubber;
(B) from 1 to 50 parts by weight of a highly water-absorp-tive resin;
(C) from 30 to 200 parts by weight of an inorganic water-absorbent, preferably, having basicity;
(D) from 10 to 50 parts by weight of a tackifier;
(E) from 30 to 200 parts by weight of a plasticizer;
(F) from 0.1 to 5 parts by weight of a vulcanizlng agent;
and (G) optionally, up to 300 parts by weight of a basic filler, and has a tensile strength Tb in the range from 1 to 30 kgf/cm2, a 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break Eb of at least 300%
and water-swellability S2l in the range from 150 to 500%
at 23 ~C.
The above mentioned water-swellability S2, or, gener-ally, S~ is defined by the ratio in % of the weight of the material swollen by keeping in water at 23 ~C for 21 days or n days to the weight of the same material before swelling with water.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The butyl rubber or isobutylene-based rubber used as the component (A) in the present invention includes so-called butyl rubbers as a copolymeric rubber of isobutylene and a small amount of isoprene, which should preferably have a degree of unsaturation of 0.3 to 3.0% by moles, and halogenated butyl rubbers, e.g., chlorinated and brominated ~21413 butyl rubbers, which should preferably have a degree of unsaturation of 0.1 to 3.0% by moles and a halogen content of 0.3 to 3.0% by welght. In particular, chlorinated and bromlnated butyl rubbers are preferred in respect of the high reactlvity.
The hlghly water-absorptlve resln used as the component (B) ln the present invention is a polymeric electrolyte having a crosslinked structure capable of absorbing water ln an amount of several tens to several hundreds times by welght based on the welght of the polymer at room tempera-ture and serves as a swelling-supporting material and includes, for example, poly(acrylic acid)-based ones, modified poly(vinyl alcohol)-based ones, copolymers of vinyl alcohol and acryllc acid, copolymers of an olefin and maleic anhydrlde and the like. The last mentloned copolymers of an olefln and malelc anhydrlde, such as a commerclally avallable product sold under the tradename of KI Gel, are preferred. The amount of thls component (B) ls usually ln the range from 1 to 50 parts by weight or, preferably, from 3 to 40 parts by welght per 100 parts by weight of the component (A)~ When the amount of the com-ponent (B) is too small, the water stop prepared from the composltlon would be poor in the water-swellability showing only insufficient degree of expansion by swelling or taking an unduly long tlme for swelling resulting in a poor water leakage-preventing power. When the amount of the component (B) is too large, on the other hand, the water stop may exhlblt an excesslvely large swelling pressure eventually resulting in collapsing of the water stop bodies per se or cracking of the concrete bodies by the back-pressure of the back-fills.
The component (C) compounded in the water-swellable composltion for the water stop is can be any of inorganic powdery materials capable of swelling by absorbing water in an amount of several to several tens times by weight based on the dry weight of the powder at room temperature.
Examples of such an inorganic water-absorbent include, for 202f ~I3 example, sil1cic acid compounds such as hydrated sllicic acid, hydrated sllicates and the like, bentonites mainly composed of montmorillonite and so on. The inorganic water-absorbent as the component ~C) should preferably have basicity as determined by the pH of at least 8 or, prefer-ably, at least 9 of a 10% by weight aqueous suspension thereof. The amount of the component (C) compounded in the water-swellable composltion is usually in the range from 30 to 200 parts by weight or, preferably, from 50 to 150 parts by weight per lO0 parts by weight of the component (A).
When the amount of the component (C) is too small, the water stop prepared from the composition would be poor ln the water-swellability showing only insufficient degree of expansion by swelling or taking an unduly long time for swelling resulting in a poor water leakage-preventing power, in particular, at the initial stage. When the amount of the component (C) is too large, on the other hand, the workability with the water stop would be poor due to the eventual collapsing or hardening of the water stop bodies when swollen with water.
The component (D) compounded in the water-swellable composition for the inventive water stop is a tackifier which is exemplified by petroleum resins including those of the aliphatic, aromatic, alicyclic, copolymeric and hydrogenated types, terpene reslns including polyterpenes, terpene-phenol resins and the like, xylene resins including modified xylene resins, phenolic resins including alkylphe-nol resins, modified phenol resins and the l1ke, coumarone-indene resins, rosins, rosin-based resins including modified roslns and the like, shellacs, dammar resins, copal resins, polybutenes, polyisobutylenes, liquid polychloroprenes, liquid polybutadienes and the like. The amount of the component (D) is usually in the range from 10 to 50 parts by weight or, preferably, from 15 to 40 parts by weight per lO0 parts by weight of the component (A). When the amount of the component (D) is too small, the water stop would only have poor adhesiveness and the impregnability thereof to 202I~13 jolnt gaps is decreased. When the amount thereof is too large, on the other hand, the surface of the water stop is lmparted with hydrophobicity more or less so that the water stop is less water-swellable not to fully exhibit the desired water leakage preventing power.
The component (E) compounded in the water-swellable composition for the inventive water stop is a plasticizer which is exempllfied by plasticizers of phthalic acld-mineral oil of the paraffinic, naphthenic or aromatic type, phosphate ester-based plasticizers, adipate-based plasti-cizers, sebacate-based plasticizers, stearic acid, palmitic acid, castor oil, cottonseed oil, rapeseed oil, paraffins, chlorinated paraffins and the like. The amount of the plasticizer as the component (E) compounded in the water-swellable composition for the inventive water stop isusually in the range from 30 to 200 parts by weight or, preferably, from 50 to 150 parts by weight per 100 parts by weight of the component (A). When the amount thereof is too small, the composltion is imparted with increased hardness resulting in poor workability of the water stop prepared therefrom. When the amount thereof is too large, on the other hand, the composition is imparted with decreased hardness so that the water stop prepared therefrom would be under a risk of eventual collapsing by swelling with water after working.
The component (F) compounded in the water-swellable composition for the inventive water stop is a vulcanizing agent which is exemplified by sulfur, modified phenolic resins such as methylolated alkylphenol resins, brominated alkylphenol resins and the like and thiuram compounds such as tetramethyl thiuram disulfide, tetramethyl thiuram monosulfide and the like. The amount of the component (F) is usually in the range from 0.1 to 5 parts by weight or, preferably, from 0.3 to 2.0 parts by weight per 100 parts by weight of the component (A). When the amount of-the vulcanizing agent is too small, the crosslinking density in the water stop would be too low so that the water stop body 21~f 4I 3 has poor mechanlcal strengths resulting in eventual col-lapsing of the water stop body after swelllng with water.
When the amount of the vulcanizing agent is too large, on the other hand, an undesirable phenomenon of blooming may be caused on the surface of the water stop.
It ls usually desirable that the vulcanizing agent as the component (F) is used in combination with a vulcaniza-tion accelerator. Examples of the vulcanization accelerator include thiourea compounds such as mercaptoimidazoline and the like, thiazole compounds such as mercaptobenzothiazole, dibenzothiazyl disulfide and the like, carbamate compounds such as zinc dimethyl dithiocarbamate, copper dimethyl-dithiocarbamate and the like, and so on. Though largely dependent on the types of the vulcanizing agent, the amount of the vulcanization accelerator is usually in the range not to exceed 5 parts by weight or, preferably, from 0.5 to 3 parts by weight per 100 parts by weight of the component ~A).
Further, the water-swellable composition for the inventive water stop is compounded optionally with a basic filler as the component (G), especially, when the inorganic water-absorbent as the component (C) has no basicity. The basic filler here implied includes various kinds of inor-ganic fillers of which a 10% by weight aqueous suspension has a pH of 8 or higher or, preferably, 9 or higher as exemplifled by magnesium carbonate hydroxide, calcium carbonate hydroxide and the like. Compounding of the component (G) has an effect to accelerate water absorption and swelling of the water stop when it is contacted with water so that the initial water-stopping effect can be rapidly exhibited. The amount of the component (G) usually should not exceed 300 parts by weight or, preferably, should not exceed 200 parts by weight per 100 parts by weight of the component (A). When the amount thereof is too large, the water leakage preventing power of the water stop may be somewhat decreased.
In addltion to the above descrlbed components, lt is optlonal that the water-swellable composition for the inventive water stop is admixed with various kinds of additives conventionally compounded in the prior art water stops each in a limited amount. Some of such optional additlves lnclude aging retarders, fillers, coloring agents, processing aids and the like. Examples of the aging retarder include amine compounds, phenolic compounds and the like. Examples of the filler include calcium carbonate, zlnc oxide, hard clay, carbon black and the like.
The water-swellable adheslve water stop of the inven-tion can be prepared by uniformly compounding the above described components each in a specified amount by using a suitable blending machine such as a pressurizable kneader and the like to give a water-swellable composition and then shaping and vulcanizing the shaped composltion to such an extent that the vulcanlzed compositlon may have a tensile strength Tb in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elonga-tlon at break Eb of at least 300% and degree of swellingSz, ln the range from 150 to 500%. The definition of the degree of swelling Sz~ lS given before. The water-swellable composition can be shaped by any known shaping method lncludlng extrusion molding, compression molding and the llke.
The water-swellable adhesive water stop prepared in the above described manner exhibits excellent performance for water leakage prevention with various advnatages including high adhesiveness to the substrate surface, relatively small compressive elastic resillence, good workability such as impregnability in working to any narrow gaps, follow-up behavlor to the gap expansion after working by virtue of swelling with water and sufficiently high strengths to withstand the collapsing force caused by excessive swelling.
Accordingly, the water-swellable adhesive water stop of the invention can be used in a wide field of applications not only in civil engineering and architectural works of - 9 ~ 3 construction and maintenance for the prevention of water leakage through the joints in the shield tunnel works and shield segments, joints of precast concrete bodies such as precast concrete pipes, precast culvert boxes and the like, construction joints in concrete structures, joints between steel-made bodies such as U-flumes, corrugated pipes and the like but also as various kinds of repair materials and water-retainlng material in agriculture and horticulture.
In the following, examples are given to illustrate the present invention in more detail but not to limit the scope of the invention in any way. The term of "parts" appearing in the following always refers to "parts by weight". The materials used in the following examples for compounding are specified as follows.
(I) Butyl rubber A: Exxon*Butyl 268, a product by Exxon Chemical Co.
(II) Butyl rubber B: Exxon Butyl 065, a product by Exxon Chemical Co.
(III) Butyl rubber C: Exxon Bromobutyl 2244, a product by Exxon Chemical Co.
(IV) Highly water-absorptive resin: KI Gel, a product by Kuraray Co.
(V) Inorganic water-absorbent A: Nipsil* VN-3, a product by Nippon Silica Kogyo Co. (hydrated silicic acid, neutral) (VI) Inorganic water-absorbent B: Nipsil NA, a product by Nippon Silica Kogyo Co. (hydrated sllicic acid, basic) (VII) Tackifier: petroleum resin Escorez 1102, a product by Tonex Co.
(VIII) Plasticizer: naphthenic process oil (IX) Vulcanizing agent A: sulfur (X) Vulcanizing agent B: tetramethyl thiuram disulfide (IX) Vulcanization accelerator: mercaptobenzothiazole (XII) Basic filler A: magnesium carbonate hydroxide (XIII) Basic filler B: calcium carbonate hydroxide *Trade Mark ~. ~ .v Example 1.
A butyl rubber compound was prepared by thoroughly blendlng, ln a pressurlzable kneader for 30 minutes, 100 parts of the butyl rubber A, 20 parts of the highly water-absorptive resin, 80 parts of the inorganic water-absorbent A, 20 parts of the tackifler, 80 parts of the plasticizer, 2 parts of the vulcanizlng agent A, 1 part of the vulcanl-zatlon accelerator 5 parts of zlnc oxlde, 75 parts of calclum carbonate and 20 parts of carbon black. The com-pound was extruslon-molded from a 60 mm-dlameter extruder machine having a screw rotating at 40 rpm and a die kept at a temperature of 80 ~C and the shaped compound was vulcanlzed by heatlng at 170 ~C for 8 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 19.0 kgf/cmZ, 100% elastic modulus of 2.5 kgf/cm2, ultlmate elongation at break of 1200% and degree of swelling S2, of 250%. The test bodies swollen with water maintained the shape before swelllng without collapsing.
Example 2.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 50 parts of the butyl rubber B, 50 parts of the butyl rubber C, 40 parts of the highly water-absorptlve resln, 30 parts of the lnorganlc water-absorbent A, 25 parts of the tacklfier, 75 parts of the plasticlzer, 1.5 parts of the vulcanizing agent A, 0.8 part of the vulcanizing agent B, 4 parts of zinc oxide, 60 parts of calcium carbonate and 16 parts of carbon black.
The compound was extruslon-molded in the same manner as in Example l and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 18.0 kgf/cm2, 100% elastic modulus of 2.0 kgf/cm2, ultimate elongatlon at break of 1350% and degree of swelllng S2l of 420%. The test bodles swollen wlth water malntalned the shape before swelllng without collapslng .
Example 3.
A rubber compound was prepared ln the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber C, 80 parts of an EPDM rubber, 40 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent A, 50 parts of the tackifier, 120 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanizing agent B, 5 parts of zinc oxide, 75 parts of calcium carbonate and 20 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tenslle strength of 25.0 kgf/cmZ, 100% elastic modulus of 2.2 kgf/cm2, ultimate elongation at break of 950% and degree of swelling S2, of 170%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 4.
A butyl rubber compound was prepared in the same manner as ln Example 1 by thoroughly blending 100 parts of the butyl rubber C, 10 parts of the highly water-absorptive resin, 120 parts of the inorganlc water-absorbent A, 10 parts of a polybutene as a tackifier, 100 parts of the plasticizer, 1 part of the vulcanizing agent A, 1 part of 25 the vulcanizing agent B, 3.5 parts of zinc oxide, 52.5 parts of calcium carbonate and 14 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodles had a tenslle strength of 15.0 kgf/cm2, 100% elastic modulus of 1.3 kgf/cm2, ultimate elongation at break of 1410% and degree of swelling S2~ of 220%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 5.
A butyl rubber compound was prepared in the same manner as ln Example 1 by thoroughly blending 50 parts of the butyl rubber C, 50 parts of a reclalmed butyl rubber, 20 parts of the hlghly water-absorptive resin, 90 parts of the inorganic water-absorbent A, 20 parts of the tackifier, 80 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanlzing agent B, 4 parts of zinc oxide, 60 parts of calcium carbonate and 16 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 16.0 kgf/cm2, 100% elastic modulus of 15 1.8 kgf/cm2, ultlmate elongation at break of 1150% and degree of swelling S2, of 280%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Comparative Example 1.
A full-vulcanization type SBR rubber compound was prepared in the same manner as in Example 1 by thoroughly blending lO0 parts of an SBR, 7 parts of the plasticizer, 2 parts of the vulcanizing agent A, 3 parts of the vulcani-zation accelerator, 1 part of stearic acid, 3.5 parts of 25 zinc oxide, 52.5 parts of calcium carbonate and 14 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a 30 tensile strength of 185 kgf/cm2, 100~ elastic modulus of 15 kgf/cm2, ultimate elongation at break of 650% and degree of swelling S2, of 100% exhibiting low water-swellability and poor workability.
Comparative Example 2.
A full-vulcanization type rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of a polychloroprene rubber, 60 parts of the ~14I3 hlghly water-absorptive resin, 4 parts of magneslum oxide, 5 parts of zinc oxlde, 7 parts of the plasticizer, 1 part of the vulcanizing agent B, 1 part of stearic acid and 2 parts of an aging retarder. The compound was extrusion-molded in the same manner as in Example 1 and the shapedcompound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 55 kgf/cm2, 100% elastic modulus of 9 kgf/cmZ, ultimate elongation at break of 670% and degree of swelling S2, of 610%. The water-swollen test bodies retained the shape before swelling without collapsing but the workability thereof as a water stop was poor due to the high rigidity.
Comparative Example 3.
An unvulcanizable adhesive butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 10 parts of the tackifier, 100 parts of a polybutene as an additional tacklfier, 150 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 0.57 kgf/cm2, 100% elastic modulus of 0.5 kgf/cm2, ultimate elongation at break of 1600% and degree of swelling S2 1 of 100% showing a very small swelling with water not to meet the requirement for a water stop.
Comparative Example 4.
An unvulcanizable water-swellable adhesive butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blendlng 100 parts of the butyl rubber A, 40 parts of the highly water-absorptive resin, 50 parts of the inorganic water-absorbent A, 10 parts of the tackifier, 100 parts of a polybutene as an additional tackifier, 100 parts of calcium carbonate and 20 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 0.52 kgf/cm2, 100% elastic modulus of 0.48 kgf/cm2 and 2~1413 ultlmate elongation at break of 1550%. The degree of swelling could not be determined because the test bodles became collapsed in the course of swelling in water.
Comparative Example 5.
A partial-vulcanization type butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending lO0 parts of a partlally vulcanlzed butyl rubber Escolant-lO, 30 parts of the highly water-absorptive resin, 40 parts of the lnorganic water-absorbent A, 10 parts of the tackifier, 50 parts of a polybutene as an additional tacki-fier, 120 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 15 7.0 kgf/cm2, 100% elastic modulus of 4.4 kgf/cm2 and ulti-mate elongation at break of 790%. The degree of swelling could not be determined because the test bodies became collapsed in the course of swelling in water.
Example 6.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 10 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent B, 20 parts of the tackifier, 60 parts of the plastlclzer, 2 parts of the vulcanizlng agent A, 1 part of the vulcanization accelerator, 5 parts of zinc oxide, 50 parts of calcium carbonate and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 2.53 kgf/cm2, 100% elastic modulus of 1.3 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling Sl, Sl 4 and S2l of 180%, 275% and 304%, respectively. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 7.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blendlng 50 parts of the butyl rubber B, 50 parts of the butyl rubber C, 30 parts of the hlghly water-absorptive resin, 30 parts of the inorganic water-absorbent A, 30 parts of the inorganic water-absorbent B, 30 parts of the tackifier, 80 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcaniz-ing agent B, 5 parts of zinc oxide, 50 parts of calcium carbonate and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 15.8 kgf/cmZ, 100% elastic modulus of 2.8 kgf/cm2, ultimate elongation at break of 1200% and degrees of swelling S~, S, 4 and S2l of 220%, 350% and 381%, respectively. The test bodies swollen with water maintained the shape before swelllng without collapsing.
Example 8.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber C, 25 parts of the highly water-absorptive resin, 80 parts of the inorganic water-absorbent A, 10 parts of a polybutene as a tackifier, 100 parts of the plasti-cizer, 1 part of the vulcanizing agent A, 0.8 part of the vulcanizing agent B, 50 parts of the basic filler A, 5 parts of zinc oxide, 15 parts of carbon black and 40 parts of calclum carbonate. The compound was extrusion-molded ln the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 4 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.10 kgf/cm2, 100% elastic modulus of 1.1 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling S~, Sl 4 and S2~ of 250%, 390% and 416%, respectively. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 9.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 30 parts of the butyl rubber B, 70 parts of the butyl rubber C, 10 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent A, 10 parts of a polybutene as a tackifier, 70 parts of the plasticlzer, 2 parts of the vulcanizing agent A, 1 part of the vulcanizing agent B, 0.8 part of the vulcanization accelerator, 50 parts of the basic filler B, 5 parts of zinc oxide, 15 parts of carbon black and 40 parts of calcium carbonate. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 7 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.80 kgf/cm2, 100% elastic modulus of 1.5 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling S7, Sl 4 and S2~ of 150%, 230% and 260%, respectively. The test bodies swollen with water malntained the shape before swelling without collapsing.
Example 10.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 60 parts of the inorganic water-absorbent B, 20 parts of the highly water-absorptive resin, 20 parts of the tackifier, 60 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanization accele-rator, 60 parts of the basic filler A, 5 parts of zinc oxide and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanlzed by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.80 kgf/cm2, ultimate elongation at break of at least 2000~ and degrees of swelling S7, S~ 4 and S2 1 of 210%, 330% and 368%, respectively. The test bodies swollen with water maintained the shape before swelling without collapslng.
2û214I3 . ..~
Comparative Example 6.
A butyl rubber compound was prepared ln the same manner as in Example 1 by thoroughly blendlng 50 parts of the butyl rubber A, 50 parts of the butyl rubber C, 80 parts of the highly water-absorptlve resin, 10 parts of the tackifier, 80 parts of the plasticlzer, 2 parts of the vulcanizing agent A, l part of the vulcanlzation accelerator, 10 parts of zinc oxide, 100 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 3.50 kgf/cm2, 100% elastic modulus of 2.6 kgf/cm2, ultimate elongation at break of at least 1800%
and degree of swelling S7 of 320~. The thus prepared water stop had poor mechanical strengths and was collapsed during the further continued lmmersion in water.
Thus, the water-swellable adhesive water stop of the present invention, which has been completed as a result of the extensive investigations undertaken by the inventor, is a shaped and vulcanized body of a composition comprising:
(A) 100 parts by weight of a butyl rubber;
(B) from 1 to 50 parts by weight of a highly water-absorp-tive resin;
(C) from 30 to 200 parts by weight of an inorganic water-absorbent, preferably, having basicity;
(D) from 10 to 50 parts by weight of a tackifier;
(E) from 30 to 200 parts by weight of a plasticizer;
(F) from 0.1 to 5 parts by weight of a vulcanizlng agent;
and (G) optionally, up to 300 parts by weight of a basic filler, and has a tensile strength Tb in the range from 1 to 30 kgf/cm2, a 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break Eb of at least 300%
and water-swellability S2l in the range from 150 to 500%
at 23 ~C.
The above mentioned water-swellability S2, or, gener-ally, S~ is defined by the ratio in % of the weight of the material swollen by keeping in water at 23 ~C for 21 days or n days to the weight of the same material before swelling with water.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
The butyl rubber or isobutylene-based rubber used as the component (A) in the present invention includes so-called butyl rubbers as a copolymeric rubber of isobutylene and a small amount of isoprene, which should preferably have a degree of unsaturation of 0.3 to 3.0% by moles, and halogenated butyl rubbers, e.g., chlorinated and brominated ~21413 butyl rubbers, which should preferably have a degree of unsaturation of 0.1 to 3.0% by moles and a halogen content of 0.3 to 3.0% by welght. In particular, chlorinated and bromlnated butyl rubbers are preferred in respect of the high reactlvity.
The hlghly water-absorptlve resln used as the component (B) ln the present invention is a polymeric electrolyte having a crosslinked structure capable of absorbing water ln an amount of several tens to several hundreds times by welght based on the welght of the polymer at room tempera-ture and serves as a swelling-supporting material and includes, for example, poly(acrylic acid)-based ones, modified poly(vinyl alcohol)-based ones, copolymers of vinyl alcohol and acryllc acid, copolymers of an olefin and maleic anhydrlde and the like. The last mentloned copolymers of an olefln and malelc anhydrlde, such as a commerclally avallable product sold under the tradename of KI Gel, are preferred. The amount of thls component (B) ls usually ln the range from 1 to 50 parts by weight or, preferably, from 3 to 40 parts by welght per 100 parts by weight of the component (A)~ When the amount of the com-ponent (B) is too small, the water stop prepared from the composltlon would be poor in the water-swellability showing only insufficient degree of expansion by swelling or taking an unduly long tlme for swelling resulting in a poor water leakage-preventing power. When the amount of the component (B) is too large, on the other hand, the water stop may exhlblt an excesslvely large swelling pressure eventually resulting in collapsing of the water stop bodies per se or cracking of the concrete bodies by the back-pressure of the back-fills.
The component (C) compounded in the water-swellable composltion for the water stop is can be any of inorganic powdery materials capable of swelling by absorbing water in an amount of several to several tens times by weight based on the dry weight of the powder at room temperature.
Examples of such an inorganic water-absorbent include, for 202f ~I3 example, sil1cic acid compounds such as hydrated sllicic acid, hydrated sllicates and the like, bentonites mainly composed of montmorillonite and so on. The inorganic water-absorbent as the component ~C) should preferably have basicity as determined by the pH of at least 8 or, prefer-ably, at least 9 of a 10% by weight aqueous suspension thereof. The amount of the component (C) compounded in the water-swellable composltion is usually in the range from 30 to 200 parts by weight or, preferably, from 50 to 150 parts by weight per lO0 parts by weight of the component (A).
When the amount of the component (C) is too small, the water stop prepared from the composition would be poor ln the water-swellability showing only insufficient degree of expansion by swelling or taking an unduly long time for swelling resulting in a poor water leakage-preventing power, in particular, at the initial stage. When the amount of the component (C) is too large, on the other hand, the workability with the water stop would be poor due to the eventual collapsing or hardening of the water stop bodies when swollen with water.
The component (D) compounded in the water-swellable composition for the inventive water stop is a tackifier which is exemplified by petroleum resins including those of the aliphatic, aromatic, alicyclic, copolymeric and hydrogenated types, terpene reslns including polyterpenes, terpene-phenol resins and the like, xylene resins including modified xylene resins, phenolic resins including alkylphe-nol resins, modified phenol resins and the l1ke, coumarone-indene resins, rosins, rosin-based resins including modified roslns and the like, shellacs, dammar resins, copal resins, polybutenes, polyisobutylenes, liquid polychloroprenes, liquid polybutadienes and the like. The amount of the component (D) is usually in the range from 10 to 50 parts by weight or, preferably, from 15 to 40 parts by weight per lO0 parts by weight of the component (A). When the amount of the component (D) is too small, the water stop would only have poor adhesiveness and the impregnability thereof to 202I~13 jolnt gaps is decreased. When the amount thereof is too large, on the other hand, the surface of the water stop is lmparted with hydrophobicity more or less so that the water stop is less water-swellable not to fully exhibit the desired water leakage preventing power.
The component (E) compounded in the water-swellable composition for the inventive water stop is a plasticizer which is exempllfied by plasticizers of phthalic acld-mineral oil of the paraffinic, naphthenic or aromatic type, phosphate ester-based plasticizers, adipate-based plasti-cizers, sebacate-based plasticizers, stearic acid, palmitic acid, castor oil, cottonseed oil, rapeseed oil, paraffins, chlorinated paraffins and the like. The amount of the plasticizer as the component (E) compounded in the water-swellable composition for the inventive water stop isusually in the range from 30 to 200 parts by weight or, preferably, from 50 to 150 parts by weight per 100 parts by weight of the component (A). When the amount thereof is too small, the composltion is imparted with increased hardness resulting in poor workability of the water stop prepared therefrom. When the amount thereof is too large, on the other hand, the composition is imparted with decreased hardness so that the water stop prepared therefrom would be under a risk of eventual collapsing by swelling with water after working.
The component (F) compounded in the water-swellable composition for the inventive water stop is a vulcanizing agent which is exemplified by sulfur, modified phenolic resins such as methylolated alkylphenol resins, brominated alkylphenol resins and the like and thiuram compounds such as tetramethyl thiuram disulfide, tetramethyl thiuram monosulfide and the like. The amount of the component (F) is usually in the range from 0.1 to 5 parts by weight or, preferably, from 0.3 to 2.0 parts by weight per 100 parts by weight of the component (A). When the amount of-the vulcanizing agent is too small, the crosslinking density in the water stop would be too low so that the water stop body 21~f 4I 3 has poor mechanlcal strengths resulting in eventual col-lapsing of the water stop body after swelllng with water.
When the amount of the vulcanizing agent is too large, on the other hand, an undesirable phenomenon of blooming may be caused on the surface of the water stop.
It ls usually desirable that the vulcanizing agent as the component (F) is used in combination with a vulcaniza-tion accelerator. Examples of the vulcanization accelerator include thiourea compounds such as mercaptoimidazoline and the like, thiazole compounds such as mercaptobenzothiazole, dibenzothiazyl disulfide and the like, carbamate compounds such as zinc dimethyl dithiocarbamate, copper dimethyl-dithiocarbamate and the like, and so on. Though largely dependent on the types of the vulcanizing agent, the amount of the vulcanization accelerator is usually in the range not to exceed 5 parts by weight or, preferably, from 0.5 to 3 parts by weight per 100 parts by weight of the component ~A).
Further, the water-swellable composition for the inventive water stop is compounded optionally with a basic filler as the component (G), especially, when the inorganic water-absorbent as the component (C) has no basicity. The basic filler here implied includes various kinds of inor-ganic fillers of which a 10% by weight aqueous suspension has a pH of 8 or higher or, preferably, 9 or higher as exemplifled by magnesium carbonate hydroxide, calcium carbonate hydroxide and the like. Compounding of the component (G) has an effect to accelerate water absorption and swelling of the water stop when it is contacted with water so that the initial water-stopping effect can be rapidly exhibited. The amount of the component (G) usually should not exceed 300 parts by weight or, preferably, should not exceed 200 parts by weight per 100 parts by weight of the component (A). When the amount thereof is too large, the water leakage preventing power of the water stop may be somewhat decreased.
In addltion to the above descrlbed components, lt is optlonal that the water-swellable composition for the inventive water stop is admixed with various kinds of additives conventionally compounded in the prior art water stops each in a limited amount. Some of such optional additlves lnclude aging retarders, fillers, coloring agents, processing aids and the like. Examples of the aging retarder include amine compounds, phenolic compounds and the like. Examples of the filler include calcium carbonate, zlnc oxide, hard clay, carbon black and the like.
The water-swellable adheslve water stop of the inven-tion can be prepared by uniformly compounding the above described components each in a specified amount by using a suitable blending machine such as a pressurizable kneader and the like to give a water-swellable composition and then shaping and vulcanizing the shaped composltion to such an extent that the vulcanlzed compositlon may have a tensile strength Tb in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elonga-tlon at break Eb of at least 300% and degree of swellingSz, ln the range from 150 to 500%. The definition of the degree of swelling Sz~ lS given before. The water-swellable composition can be shaped by any known shaping method lncludlng extrusion molding, compression molding and the llke.
The water-swellable adhesive water stop prepared in the above described manner exhibits excellent performance for water leakage prevention with various advnatages including high adhesiveness to the substrate surface, relatively small compressive elastic resillence, good workability such as impregnability in working to any narrow gaps, follow-up behavlor to the gap expansion after working by virtue of swelling with water and sufficiently high strengths to withstand the collapsing force caused by excessive swelling.
Accordingly, the water-swellable adhesive water stop of the invention can be used in a wide field of applications not only in civil engineering and architectural works of - 9 ~ 3 construction and maintenance for the prevention of water leakage through the joints in the shield tunnel works and shield segments, joints of precast concrete bodies such as precast concrete pipes, precast culvert boxes and the like, construction joints in concrete structures, joints between steel-made bodies such as U-flumes, corrugated pipes and the like but also as various kinds of repair materials and water-retainlng material in agriculture and horticulture.
In the following, examples are given to illustrate the present invention in more detail but not to limit the scope of the invention in any way. The term of "parts" appearing in the following always refers to "parts by weight". The materials used in the following examples for compounding are specified as follows.
(I) Butyl rubber A: Exxon*Butyl 268, a product by Exxon Chemical Co.
(II) Butyl rubber B: Exxon Butyl 065, a product by Exxon Chemical Co.
(III) Butyl rubber C: Exxon Bromobutyl 2244, a product by Exxon Chemical Co.
(IV) Highly water-absorptive resin: KI Gel, a product by Kuraray Co.
(V) Inorganic water-absorbent A: Nipsil* VN-3, a product by Nippon Silica Kogyo Co. (hydrated silicic acid, neutral) (VI) Inorganic water-absorbent B: Nipsil NA, a product by Nippon Silica Kogyo Co. (hydrated sllicic acid, basic) (VII) Tackifier: petroleum resin Escorez 1102, a product by Tonex Co.
(VIII) Plasticizer: naphthenic process oil (IX) Vulcanizing agent A: sulfur (X) Vulcanizing agent B: tetramethyl thiuram disulfide (IX) Vulcanization accelerator: mercaptobenzothiazole (XII) Basic filler A: magnesium carbonate hydroxide (XIII) Basic filler B: calcium carbonate hydroxide *Trade Mark ~. ~ .v Example 1.
A butyl rubber compound was prepared by thoroughly blendlng, ln a pressurlzable kneader for 30 minutes, 100 parts of the butyl rubber A, 20 parts of the highly water-absorptive resin, 80 parts of the inorganic water-absorbent A, 20 parts of the tackifler, 80 parts of the plasticizer, 2 parts of the vulcanizlng agent A, 1 part of the vulcanl-zatlon accelerator 5 parts of zlnc oxlde, 75 parts of calclum carbonate and 20 parts of carbon black. The com-pound was extruslon-molded from a 60 mm-dlameter extruder machine having a screw rotating at 40 rpm and a die kept at a temperature of 80 ~C and the shaped compound was vulcanlzed by heatlng at 170 ~C for 8 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 19.0 kgf/cmZ, 100% elastic modulus of 2.5 kgf/cm2, ultlmate elongation at break of 1200% and degree of swelling S2, of 250%. The test bodies swollen with water maintained the shape before swelllng without collapsing.
Example 2.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 50 parts of the butyl rubber B, 50 parts of the butyl rubber C, 40 parts of the highly water-absorptlve resln, 30 parts of the lnorganlc water-absorbent A, 25 parts of the tacklfier, 75 parts of the plasticlzer, 1.5 parts of the vulcanizing agent A, 0.8 part of the vulcanizing agent B, 4 parts of zinc oxide, 60 parts of calcium carbonate and 16 parts of carbon black.
The compound was extruslon-molded in the same manner as in Example l and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 18.0 kgf/cm2, 100% elastic modulus of 2.0 kgf/cm2, ultimate elongatlon at break of 1350% and degree of swelllng S2l of 420%. The test bodles swollen wlth water malntalned the shape before swelllng without collapslng .
Example 3.
A rubber compound was prepared ln the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber C, 80 parts of an EPDM rubber, 40 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent A, 50 parts of the tackifier, 120 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanizing agent B, 5 parts of zinc oxide, 75 parts of calcium carbonate and 20 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tenslle strength of 25.0 kgf/cmZ, 100% elastic modulus of 2.2 kgf/cm2, ultimate elongation at break of 950% and degree of swelling S2, of 170%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 4.
A butyl rubber compound was prepared in the same manner as ln Example 1 by thoroughly blending 100 parts of the butyl rubber C, 10 parts of the highly water-absorptive resin, 120 parts of the inorganlc water-absorbent A, 10 parts of a polybutene as a tackifier, 100 parts of the plasticizer, 1 part of the vulcanizing agent A, 1 part of 25 the vulcanizing agent B, 3.5 parts of zinc oxide, 52.5 parts of calcium carbonate and 14 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodles had a tenslle strength of 15.0 kgf/cm2, 100% elastic modulus of 1.3 kgf/cm2, ultimate elongation at break of 1410% and degree of swelling S2~ of 220%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 5.
A butyl rubber compound was prepared in the same manner as ln Example 1 by thoroughly blending 50 parts of the butyl rubber C, 50 parts of a reclalmed butyl rubber, 20 parts of the hlghly water-absorptive resin, 90 parts of the inorganic water-absorbent A, 20 parts of the tackifier, 80 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanlzing agent B, 4 parts of zinc oxide, 60 parts of calcium carbonate and 16 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 16.0 kgf/cm2, 100% elastic modulus of 15 1.8 kgf/cm2, ultlmate elongation at break of 1150% and degree of swelling S2, of 280%. The test bodies swollen with water maintained the shape before swelling without collapsing.
Comparative Example 1.
A full-vulcanization type SBR rubber compound was prepared in the same manner as in Example 1 by thoroughly blending lO0 parts of an SBR, 7 parts of the plasticizer, 2 parts of the vulcanizing agent A, 3 parts of the vulcani-zation accelerator, 1 part of stearic acid, 3.5 parts of 25 zinc oxide, 52.5 parts of calcium carbonate and 14 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a 30 tensile strength of 185 kgf/cm2, 100~ elastic modulus of 15 kgf/cm2, ultimate elongation at break of 650% and degree of swelling S2, of 100% exhibiting low water-swellability and poor workability.
Comparative Example 2.
A full-vulcanization type rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of a polychloroprene rubber, 60 parts of the ~14I3 hlghly water-absorptive resin, 4 parts of magneslum oxide, 5 parts of zinc oxlde, 7 parts of the plasticizer, 1 part of the vulcanizing agent B, 1 part of stearic acid and 2 parts of an aging retarder. The compound was extrusion-molded in the same manner as in Example 1 and the shapedcompound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 55 kgf/cm2, 100% elastic modulus of 9 kgf/cmZ, ultimate elongation at break of 670% and degree of swelling S2, of 610%. The water-swollen test bodies retained the shape before swelling without collapsing but the workability thereof as a water stop was poor due to the high rigidity.
Comparative Example 3.
An unvulcanizable adhesive butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 10 parts of the tackifier, 100 parts of a polybutene as an additional tacklfier, 150 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 0.57 kgf/cm2, 100% elastic modulus of 0.5 kgf/cm2, ultimate elongation at break of 1600% and degree of swelling S2 1 of 100% showing a very small swelling with water not to meet the requirement for a water stop.
Comparative Example 4.
An unvulcanizable water-swellable adhesive butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blendlng 100 parts of the butyl rubber A, 40 parts of the highly water-absorptive resin, 50 parts of the inorganic water-absorbent A, 10 parts of the tackifier, 100 parts of a polybutene as an additional tackifier, 100 parts of calcium carbonate and 20 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 0.52 kgf/cm2, 100% elastic modulus of 0.48 kgf/cm2 and 2~1413 ultlmate elongation at break of 1550%. The degree of swelling could not be determined because the test bodles became collapsed in the course of swelling in water.
Comparative Example 5.
A partial-vulcanization type butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending lO0 parts of a partlally vulcanlzed butyl rubber Escolant-lO, 30 parts of the highly water-absorptive resin, 40 parts of the lnorganic water-absorbent A, 10 parts of the tackifier, 50 parts of a polybutene as an additional tacki-fier, 120 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded to give test samples.
The thus shaped test bodies had a tensile strength of 15 7.0 kgf/cm2, 100% elastic modulus of 4.4 kgf/cm2 and ulti-mate elongation at break of 790%. The degree of swelling could not be determined because the test bodies became collapsed in the course of swelling in water.
Example 6.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 10 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent B, 20 parts of the tackifier, 60 parts of the plastlclzer, 2 parts of the vulcanizlng agent A, 1 part of the vulcanization accelerator, 5 parts of zinc oxide, 50 parts of calcium carbonate and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 2.53 kgf/cm2, 100% elastic modulus of 1.3 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling Sl, Sl 4 and S2l of 180%, 275% and 304%, respectively. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 7.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blendlng 50 parts of the butyl rubber B, 50 parts of the butyl rubber C, 30 parts of the hlghly water-absorptive resin, 30 parts of the inorganic water-absorbent A, 30 parts of the inorganic water-absorbent B, 30 parts of the tackifier, 80 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcaniz-ing agent B, 5 parts of zinc oxide, 50 parts of calcium carbonate and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 10 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 15.8 kgf/cmZ, 100% elastic modulus of 2.8 kgf/cm2, ultimate elongation at break of 1200% and degrees of swelling S~, S, 4 and S2l of 220%, 350% and 381%, respectively. The test bodies swollen with water maintained the shape before swelllng without collapsing.
Example 8.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber C, 25 parts of the highly water-absorptive resin, 80 parts of the inorganic water-absorbent A, 10 parts of a polybutene as a tackifier, 100 parts of the plasti-cizer, 1 part of the vulcanizing agent A, 0.8 part of the vulcanizing agent B, 50 parts of the basic filler A, 5 parts of zinc oxide, 15 parts of carbon black and 40 parts of calclum carbonate. The compound was extrusion-molded ln the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 4 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.10 kgf/cm2, 100% elastic modulus of 1.1 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling S~, Sl 4 and S2~ of 250%, 390% and 416%, respectively. The test bodies swollen with water maintained the shape before swelling without collapsing.
Example 9.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 30 parts of the butyl rubber B, 70 parts of the butyl rubber C, 10 parts of the highly water-absorptive resin, 60 parts of the inorganic water-absorbent A, 10 parts of a polybutene as a tackifier, 70 parts of the plasticlzer, 2 parts of the vulcanizing agent A, 1 part of the vulcanizing agent B, 0.8 part of the vulcanization accelerator, 50 parts of the basic filler B, 5 parts of zinc oxide, 15 parts of carbon black and 40 parts of calcium carbonate. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 7 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.80 kgf/cm2, 100% elastic modulus of 1.5 kgf/cm2, ultimate elongation at break of at least 2000%
and degrees of swelling S7, Sl 4 and S2~ of 150%, 230% and 260%, respectively. The test bodies swollen with water malntained the shape before swelling without collapsing.
Example 10.
A butyl rubber compound was prepared in the same manner as in Example 1 by thoroughly blending 100 parts of the butyl rubber A, 60 parts of the inorganic water-absorbent B, 20 parts of the highly water-absorptive resin, 20 parts of the tackifier, 60 parts of the plasticizer, 2 parts of the vulcanizing agent A, 1 part of the vulcanization accele-rator, 60 parts of the basic filler A, 5 parts of zinc oxide and 15 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanlzed by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 1.80 kgf/cm2, ultimate elongation at break of at least 2000~ and degrees of swelling S7, S~ 4 and S2 1 of 210%, 330% and 368%, respectively. The test bodies swollen with water maintained the shape before swelling without collapslng.
2û214I3 . ..~
Comparative Example 6.
A butyl rubber compound was prepared ln the same manner as in Example 1 by thoroughly blendlng 50 parts of the butyl rubber A, 50 parts of the butyl rubber C, 80 parts of the highly water-absorptlve resin, 10 parts of the tackifier, 80 parts of the plasticlzer, 2 parts of the vulcanizing agent A, l part of the vulcanlzation accelerator, 10 parts of zinc oxide, 100 parts of calcium carbonate and 30 parts of carbon black. The compound was extrusion-molded in the same manner as in Example 1 and the shaped compound was vulcanized by heating at 170 ~C for 5 minutes.
The thus shaped and vulcanized test bodies had a tensile strength of 3.50 kgf/cm2, 100% elastic modulus of 2.6 kgf/cm2, ultimate elongation at break of at least 1800%
and degree of swelling S7 of 320~. The thus prepared water stop had poor mechanical strengths and was collapsed during the further continued lmmersion in water.
Claims (5)
1. A water-swellable adhesive water stop which is a shaped and vulcanized body of a vulcanizable rubber composition comprising:
(A) 100 parts by weight of a butyl rubber;
(B) from 1 to 50 parts by weight of a highly water-absorptive resin;
(C) from 30 to 200 parts by weight of an inorganic water-absorbent;
(D) from 10 to 50 parts by weight of a tackifier;
(E) from 30 to 200 parts by weight of a plasticizer; and (F) from 0.1 to 5 parts by weight of a vulcanizing agent, and has a tensile strength in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break of at least 300% and degree of swelling in water in the range from 150 to 500%
after immersion in water for 21 days at 23 °C.
(A) 100 parts by weight of a butyl rubber;
(B) from 1 to 50 parts by weight of a highly water-absorptive resin;
(C) from 30 to 200 parts by weight of an inorganic water-absorbent;
(D) from 10 to 50 parts by weight of a tackifier;
(E) from 30 to 200 parts by weight of a plasticizer; and (F) from 0.1 to 5 parts by weight of a vulcanizing agent, and has a tensile strength in the range from 1 to 30 kgf/cm2, 100% elastic modulus in the range from 1 to 4 kgf/cm2, ultimate elongation at break of at least 300% and degree of swelling in water in the range from 150 to 500%
after immersion in water for 21 days at 23 °C.
2. The water-swellable adhesive water stop as claimed in claim 1 wherein the inorganic water-absorbent has basicity.
3. The water-swellable adhesive water stop as claimed in claim 1 wherein the vulcanizable rubber composition further comprises:
(G) from 5 to 300 parts by weight of a basic filler.
(G) from 5 to 300 parts by weight of a basic filler.
4. The water-swellable adhesive water stop as claimed in claim 1 wherein the inorganic water-absorbent is selected from the group consisting of hydrated silicic acid, hydrated silicates and bentonite.
5. The water-swellable adhesive water stop as claimed in claim 3 wherein the basic filler is magnesium carbonate hydroxide or calcium carbonate hydroxide.
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1-196039 | 1989-07-28 | ||
| JP1196039A JP2774319B2 (en) | 1989-07-28 | 1989-07-28 | Adhesive water-swelling waterproof material |
| JP2-93682 | 1990-04-09 | ||
| JP9368290A JP2774353B2 (en) | 1990-04-09 | 1990-04-09 | Adhesive water-swelling waterproof material |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2021413A1 CA2021413A1 (en) | 1991-01-29 |
| CA2021413C true CA2021413C (en) | 1999-01-12 |
Family
ID=26434982
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2021413 Expired - Fee Related CA2021413C (en) | 1989-07-28 | 1990-07-18 | Water-swellable adhesive water stop |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2021413C (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109370314A (en) * | 2018-10-22 | 2019-02-22 | 上海宝冶集团有限公司 | A kind of construction site maintenance record method of concrete |
-
1990
- 1990-07-18 CA CA 2021413 patent/CA2021413C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2021413A1 (en) | 1991-01-29 |
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| EEER | Examination request | ||
| MKLA | Lapsed |