CN110527475B - Sprayable anti-sagging silane modified polyether sealant and preparation method thereof - Google Patents
Sprayable anti-sagging silane modified polyether sealant and preparation method thereof Download PDFInfo
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- CN110527475B CN110527475B CN201910918485.5A CN201910918485A CN110527475B CN 110527475 B CN110527475 B CN 110527475B CN 201910918485 A CN201910918485 A CN 201910918485A CN 110527475 B CN110527475 B CN 110527475B
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J11/00—Features of adhesives not provided for in group C09J9/00, e.g. additives
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
- C09J171/00—Adhesives based on polyethers obtained by reactions forming an ether link in the main chain; Adhesives based on derivatives of such polymers
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2201/00—Properties
- C08L2201/08—Stabilised against heat, light or radiation or oxydation
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2205/00—Polymer mixtures characterised by other features
- C08L2205/02—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group
- C08L2205/025—Polymer mixtures characterised by other features containing two or more polymers of the same C08L -group containing two or more polymers of the same hierarchy C08L, and differing only in parameters such as density, comonomer content, molecular weight, structure
Abstract
The invention discloses a sprayable anti-sagging type silane modified polyether sealant and a preparation method thereof. The sprayable anti-sagging silane modified polyether sealant comprises the following components in parts by mass: 60-100 parts of silane-terminated polyether, 30-60 parts of reactive diluent, 40-60 parts of plasticizer, 120-200 parts of filler, 0.1-16 parts of pigment, 0.5-5 parts of ultraviolet absorber, 0.5-5 parts of light stabilizer, 1-12 parts of thixotropic agent, 1-10 parts of water removing agent, 1-10 parts of coupling agent and 0.1-5 parts of catalyst; the reactive diluent is a silane modified polyether. Also discloses a preparation method of the sealant. The silane modified polyether sealant disclosed by the invention has the advantages of the traditional polyurethane glue and organic silica gel, has excellent sprayability and high sag resistance, has high bonding strength, meets the requirements of efficient spraying construction capability and deformation resistance, can be shaped and attractive, and is wide in application.
Description
Technical Field
The invention relates to the technical field of adhesives, in particular to a sprayable anti-sagging silane modified polyether sealant and a preparation method thereof.
Background
The sealing glue is a kind of sealing material with certain cohesiveness and deformation following the shape of the sealing surface, and is an adhesive for filling the gaps and sealing, and has the functions of preventing leakage, water, vibration, sound and heat. In recent years, the development of various industries such as locomotive, building interior decoration, industrial manufacturing and the like has higher and higher requirements on the performance of the sealant, including spraying, deformation resistance, high modulus, high bonding strength, environmental protection, high efficiency, simplicity and convenience in construction and the like.
Polyurethane sealant and silicone adhesive are main products in the field of sealant. The traditional polyurethane sealant contains free isocyanate and an organic solvent, has poor low-temperature workability, and is easy to generate bubbles during high-temperature curing. Common silicone adhesive has heavy smell, can not be coated, and is easy to generate oil dialysis to pollute concrete, stone and other ornaments.
The sprayability and sag resistance of sealants are contradictory, and when sprayable, it is necessary to reduce the viscosity, usually by adding solvents or plasticizers. However, the addition of solvents or plasticizers to the sealant can result in poor sag resistance of the overall sealant, which can result in some deformation or even sagging of the sealant, with a corresponding decrease in strength and modulus. The viscosity, thixotropy, consistency and other characteristics of the sealant can affect the sprayability and sag resistance of the product, and the sprayability and the sag resistance are often two different adjustment directions and are difficult to balance, so that the formula design of the sealant is difficult, and high adhesion strength or high modulus needs to be provided. Therefore, the existing sealant products, including polyurethane glue, silicone glue and other silane modified polyether sealants, generally cannot have both sprayability and high sag resistance, and cannot meet the performance requirements of high bonding strength and high modulus.
Disclosure of Invention
In order to overcome the problems that the sealant can not have both spraying property and high sag resistance and can not simultaneously meet the requirements of high bonding strength and high modulus in the prior art, the invention aims to provide a spraying sag-resistant silane modified polyether sealant, and the invention aims to provide a preparation method of the spraying sag-resistant silane modified polyether sealant.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
the invention provides a sprayable anti-sagging silane modified polyether sealant.
A sprayable anti-sagging silane modified polyether sealant comprises the following components in parts by mass: 60-100 parts of silane-terminated polyether, 30-60 parts of reactive diluent, 40-60 parts of plasticizer, 120-200 parts of filler, 0.1-16 parts of pigment, 0.5-5 parts of ultraviolet absorber, 0.5-5 parts of light stabilizer, 1-12 parts of thixotropic agent, 1-10 parts of water removing agent, 1-10 parts of coupling agent and 0.1-5 parts of catalyst; wherein the reactive diluent is silane modified polyether.
Preferably, the sprayable anti-sagging silane modified polyether sealant comprises the following components in parts by mass: 74-88 parts of silane-terminated polyether, 40-57 parts of reactive diluent, 51-59 parts of plasticizer, 191-196 parts of filler, 13.6-15 parts of pigment, 1.3-1.5 parts of ultraviolet absorber, 1.1-2.1 parts of light stabilizer, 2.2-4.1 parts of thixotropic agent, 3-3.5 parts of water remover, 2.8-4 parts of coupling agent and 1-2.4 parts of catalyst.
Preferably, in the sprayable anti-sagging type silane modified polyether sealant, the silane terminated polyether is selected from at least one of silyl terminated polyether, and mixture terminated polyether of dimethoxysilane and triethoxysilane; further preferably, the silane-terminated polyether is selected from at least one of S303H, SAX350, SAX400, SAX750, 12000DS, 30000T; still further preferred, the silane-terminated polyether is selected from at least one of S303H, SAX750, 12000 DS.
Preferably, in the sprayable sag resistant silane modified polyether sealant, the reactive diluent is prepared from the following components: 4-14 parts by mass of polyether, 4-10 parts by mass of modifier and 0.3-3 parts by mass of end capping agent; further preferably, the reactive diluent is prepared from the following components: 10-13 parts by mass of polyether, 4-6 parts by mass of modifier and 0.4-0.6 part by mass of end capping agent.
Preferably, in the preparation component of the reactive diluent, the modifier is isocyanate silane; further preferably, the modifier is at least one selected from the group consisting of isocyanatopropylmethyldimethoxysilane and isocyanatopropyltriethoxysilane.
Preferably, in the preparation component of the reactive diluent, the blocking agent is an amino hydrocarbyl silane; more preferably, the blocking agent is at least one selected from the group consisting of aminopropyltriethoxysilane, N-. beta. - (aminoethyl) - γ -aminopropylmethyldimethoxysilane, N- (. beta. -aminoethyl) - γ -aminopropyltriethoxysilane, and γ -aminopropylmethyldiethoxysilane.
Preferably, in the reactive diluent, polyether with the number average molecular weight of 300-2000 is selected as polyether; further preferably, the polyether has a number average molecular weight of 400-1200.
Preferably, in the sprayable sag resistant silane modified polyether sealant, the preparation method of the reactive diluent comprises the following steps: mixing polyether and a modifier, heating to 70-85 ℃, and reacting for 0.5-2 h; cooling to below 50 ℃, adding an end-capping reagent, and reacting for 20-40 min to obtain a reactive diluent; further preferably, the method for preparing the reactive diluent comprises the following steps: mixing polyether and a modifier, heating to 75-80 ℃, and reacting for 0.8-1.2 h; cooling to 20-48 ℃, adding a blocking agent, and reacting for 25-35 min to obtain the reactive diluent.
Preferably, the reactive diluent has a viscosity of 0.3 pas to 3 pas at 25 ℃; more preferably, the viscosity of the reactive diluent is 0.5 pas to 2 pas at 25 ℃.
Preferably, in the sprayable anti-sagging silane modified polyether sealant, the plasticizer is selected from at least one of phthalate plasticizers, fatty acid ester plasticizers, phosphate plasticizers and epoxy ester plasticizers; further preferably, the plasticizer is a phthalate plasticizer; still more preferably, the plasticizer is at least one selected from the group consisting of dibutyl phthalate, dioctyl phthalate, diisononyl phthalate, diisodecyl phthalate; still more preferably, the plasticizer is at least one selected from the group consisting of diisononyl phthalate and diisodecyl phthalate.
Preferably, in the sprayable anti-sagging type silane modified polyether sealant, the filler is selected from at least one of calcium carbonate, calcium silicate, diatomite, kaolin, montmorillonite and talcum powder; further preferably, the filler is at least one selected from calcium carbonate and talc.
Preferably, in the sprayable sag resistant silane modified polyether sealant, the pigment is at least one selected from carbon black, titanium dioxide and iron oxide.
Preferably, in the sprayable anti-sagging silane-modified polyether sealant, the ultraviolet absorber is at least one selected from the group consisting of benzotriazole ultraviolet absorbers, salicylate ultraviolet absorbers, benzophenone ultraviolet absorbers, substituted acrylonitrile ultraviolet absorbers, and triazine ultraviolet absorbers; further preferably, the ultraviolet absorber is a benzotriazole-based ultraviolet absorber; still more preferably, the ultraviolet absorber is at least one selected from the group consisting of UV-326, UV-327, UV-328, UV-329, and UV-5411; still more preferably, the ultraviolet absorber is at least one selected from the group consisting of UV-326, UV-328, and UV-329.
Preferably, in the sprayable anti-sagging type silane modified polyether sealant, the light stabilizer is a hindered amine light stabilizer; further preferably, the light stabilizer is at least one selected from the group consisting of UV-292, UV-622, UV-770, UV-783, UV-791 and UV-944; still more preferably, the light stabilizer is at least one selected from the group consisting of UV-292, UV-622 and UV-770.
Preferably, in the sprayable anti-sagging silane modified polyether sealant, the thixotropic agent is at least one selected from polyamide wax, hydrogenated castor oil, fumed silica and organic bentonite; further preferably, the thixotropic agent is a polyamide wax, and a polyamide wax of Crayvallac SL may be used.
Preferably, in the sprayable anti-sagging silane modified polyether sealant, the water removal agent is a silane water removal agent; more preferably, the water removing agent is at least one selected from the group consisting of vinyltrimethoxysilane, vinyltriethoxysilane and vinyldimethoxysilane; still more preferably, the water scavenger is vinyl trimethoxy silane, and can be selected from at least one of A-171 and Z6300.
Preferably, in the sprayable anti-sagging type silane modified polyether sealant, the coupling agent is a silane coupling agent; further preferably, the coupling agent is at least one selected from the group consisting of γ -aminopropyltrimethoxysilane, γ -aminopropyltriethoxysilane, N- (β -aminoethyl) - γ -aminopropylmethyldimethoxysilane, N- (β -aminoethyl) - γ -aminopropyltrimethoxysilane, and N- (β -aminoethyl) - γ -aminopropyltriethoxysilane; still more preferably, the coupling agent is at least one selected from the group consisting of N- (beta-aminoethyl) -gamma-aminopropylmethyldimethoxysilane and N- (beta-aminoethyl) -gamma-aminopropyltrimethoxysilane, such as at least one selected from A-1120 and KBM-602.
Preferably, in the sprayable anti-sagging type silane modified polyether sealant, the catalyst is an organic tin catalyst; further preferably, the catalyst is at least one selected from the group consisting of dibutyltin dilaurate, dioctyltin dilaurate, dimethyltin dineodecanoate, dibutyltin diacetate, stannous octoate and chelated tin; still more preferably, the catalyst is a chelated tin catalyst, and can be selected from at least one of U-220H (dibutyltin bis (acetylacetonate)) and KRA-1.
The invention also provides a preparation method of the sprayable anti-sagging type silane modified polyether sealant.
A preparation method of sprayable anti-sagging silane modified polyether sealant comprises the following steps:
1) adding silane-terminated polyether, a reactive diluent, a plasticizer, a filler, a pigment, an ultraviolet absorbent, a light stabilizer and a thixotropic agent into a stirring kettle, stirring under vacuum, and heating to 100-120 ℃ to obtain a dry paste;
2) and cooling the dried paste to below 50 ℃, adding a water removing agent, a coupling agent and a catalyst, mixing and stirring to obtain the sprayable anti-sagging type silane modified polyether sealant.
Preferably, in the step 1) of the preparation method of the sprayable anti-sagging silane modified polyether sealant, the stirring vacuum degree is less than or equal to-0.09 MPa.
Preferably, in the preparation method step 1) of the sprayable anti-sagging silane modified polyether sealant, the heating to 100-120 ℃ needs to be maintained for 2-4 h.
Preferably, in the step 2) of the preparation method of the sprayable anti-sagging silane modified polyether sealant, the temperature of the dried paste is reduced to 20-48 ℃.
Preferably, in the step 2) of the preparation method of the sprayable anti-sagging silane modified polyether sealant, the mixing and stirring time is 15min to 30 min.
The invention has the beneficial effects that:
the sprayable anti-sagging type silane modified polyether sealant prepared by the invention has the advantages of the traditional polyurethane adhesive and organic silica gel, has high fixing strength, good sealing performance, simple construction, strong adhesive force, attractive appearance, short surface drying time, instantaneous positioning, high elasticity, improved anti-seismic performance of a sealing element, no primer, simple assembly process, reduced working procedures, accelerated production speed and reduced cost. The sealant product improves the heat resistance, cold resistance, hydrophobicity, moisture resistance, wear resistance and electrical insulation of the material, and has excellent ultraviolet resistance.
The invention introduces the self-made reactive diluent to replace the traditional solvent oil, and combines with other silane modified polyether polymers, thereby reducing the system viscosity, participating in the curing reaction, improving the crosslinking density, and fundamentally avoiding the oily dialysis caused by adding too much traditional solvent oil. And then through the formulation design in the aspects of reinforcing of thixotropic agent and filler, reach high extrudability and possess "zero" sag at the same time, can possess splendid spraying nature and high anti-deformability simultaneously, and have high bonding strength, satisfy high-efficient spraying construction ability and anti-deformation plastic aesthetic property, provide high-quality performance experience and higher economic benefits.
The sealant product of the invention has wide application, can meet the higher and higher performance requirements of various industries such as current locomotive, building interior decoration, industrial manufacturing and the like on the sealant product, and has various application and high-efficiency operation requirements.
Detailed Description
The present invention will be described in further detail with reference to specific examples. The starting materials, reagents or apparatus used in the examples and comparative examples were obtained from conventional commercial sources unless otherwise specified. For example, a manufacturer of silane-terminated polyethers may select Kaneka, Japan, or Riyangtai, a national product. Unless otherwise indicated, the testing or testing methods are conventional in the art.
Example 1
The sprayable sag resistant silane modified polyether sealant of this example had the composition shown in table 1.
TABLE 1 EXAMPLE 1 sprayable sag resistant silane modified polyether sealant composition
| Components | Raw materials | Mass portion of |
| Silane terminated polyethers | Silyl terminated polyether S303H | 88 |
| Reactive diluents | Silane modified polyether | 57 |
| Plasticizer | Diisononyl phthalate | 51 |
| Filler material | Calcium carbonate | 191 |
| Pigment (I) | Titanium dioxide | 14 |
| Thixotropic agent | Polyamide wax Crayvallac SL | 4.1 |
| Ultraviolet absorber | UV-326 | 1.5 |
| Light stabilizers | UV-622 | 1.1 |
| Water removing agent | Silane water scavenger A-171 | 3.5 |
| Coupling agent | Silane coupling agent A-1120 | 4.0 |
| Catalyst and process for preparing same | Chelated tin catalyst U-220H | 2.3 |
The reactive diluent of this example was prepared by a method comprising the steps of: mixing 12 parts by weight of polyether with the average molecular weight of 1000 and 5 parts by weight of isocyanate propyl methyl dimethoxy silane, heating to 76 ℃, and reacting for 1 hour; cooling to 45 ℃, adding 0.5 part by mass of aminopropyltriethoxysilane, reacting for 30min, and blocking the isocyanate group to obtain the silane modified polyether reactive diluent with the viscosity of 1.2 Pa.s (25 ℃).
Example 1 a method for preparing a sprayable sag resistant silane modified polyether sealant, comprising the steps of:
1) adding silane-terminated polyether, reactive diluent, plasticizer, filler, pigment, ultraviolet absorbent, light stabilizer and thixotropic agent into a vacuum double-shaft stirring kettle, stirring and dispersing uniformly, vacuumizing to be less than or equal to-0.09 MPa, heating to 110 ℃, and maintaining for 3 hours to obtain dry paste;
2) and cooling the dried paste to 45 ℃, adding a water removing agent, a coupling agent and a catalyst, and mixing and stirring for 20 minutes to obtain the fine silane modified polyether sealant product.
Example 2
The sprayable sag resistant silane modified polyether sealant of this example had the composition shown in table 2.
Table 2 example 2 sprayable sag resistant silane modified polyether sealant composition
| Components | Raw materials | Mass portion of |
| Silane terminated polyethers | Silyl terminated polyether SAX750 | 74 |
| Reactive diluents | Silane modified polyether | 40 |
| Plasticizer | Diisodecyl phthalate | 59 |
| Filler material | Calcium carbonate | 196 |
| Pigment (I) | Titanium dioxide | 15 |
| Thixotropic agent | Polyamide waxCrayvallac SL | 2.2 |
| Ultraviolet absorber | UV-329 | 1.3 |
| Light stabilizers | UV-292 | 2.1 |
| Water removing agent | Silane water remover Z6300 | 3.0 |
| Coupling agent | Silane coupling agent KBM-602 | 2.8 |
| Catalyst and process for preparing same | Chelated tin catalyst U-220H | 2.4 |
The reactive diluent of example 2 is the same as in example 1 and the sprayable sag resistant silane modified polyether sealant of example 2 is prepared by the same method as in example 1.
Example 3
The sprayable sag resistant silane modified polyether sealant of this example had the composition shown in Table 3.
Table 3 example 3 sprayable sag resistant silane modified polyether sealant composition
The reactive diluent of example 3 is the same as example 1 and the sprayable sag resistant silane modified polyether sealant of example 3 is prepared by the same method as example 1.
Comparative example 1
The sag resistant silane modified polyether sealant composition of this example is shown in Table 4.
TABLE 4 COMPARATIVE EXAMPLE 1 sag resistant silane modified polyether sealant composition
| Components | Raw materials | Mass portion of |
| Silane terminated polyethers | Silyl terminated polyether S303H | 133 |
| Plasticizer | Diisononyl phthalate | 63 |
| Filler material | Calcium carbonate | 191 |
| Pigment (I) | Titanium dioxide | 14 |
| Thixotropic agent | Polyamide wax Crayvallac SL | 4.1 |
| Ultraviolet absorber | UV-326 | 1.5 |
| Light stabilizers | UV-622 | 1.1 |
| Water removing agent | Silane water scavenger A-171 | 3.5 |
| Coupling agent | Silane coupling agent A-1120 | 4.0 |
| Catalyst and process for preparing same | Chelated tin catalyst U-220H | 2.3 |
Comparative example 1 differs from example 1 mainly in that comparative example 1 has 133 parts of silyl terminated polyether S303H and 63 parts of diisononyl phthalate, with no reactive diluent.
Comparative example 1 a method of preparing an anti-sag silane modified polyether sealant comprising the steps of:
1) adding silane-terminated polyether, plasticizer, filler, pigment, ultraviolet absorbent, light stabilizer and thixotropic agent into a vacuum double-shaft stirring kettle, uniformly stirring and dispersing, vacuumizing to be less than or equal to-0.09 MPa, heating to 110 ℃, and maintaining for 3 hours to obtain dry paste;
2) and cooling the dried paste to 45 ℃, adding a water removing agent, a coupling agent and a catalyst, and mixing and stirring for 20 minutes to obtain the silane modified polyether sealant product.
Comparative example 2
The sprayable silane-modified polyether sealant of this example had the composition shown in Table 5.
TABLE 5 COMPARATIVE EXAMPLE 2 sprayable silane modified polyether sealant composition
The main difference between comparative example 2 and example 2 is that the silyl terminated polyether SAX750 of comparative example 2 was changed to 78 parts, diisodecyl phthalate was changed to 101 parts, no reactive diluent was used and the other components were unchanged.
Comparative example 2 a silane modified polyether sealant was prepared in the same manner as in comparative example 1.
The sealant products of examples 1-3 and comparative examples 1-2 were subjected to performance tests according to GB/T14683-2017, and the test results are shown in Table 6.
TABLE 6 Properties of silane-modified polyether sealants
| Item | Unit of | Example 1 | Example 2 | Example 3 | Comparative example 1 | Comparative example 2 |
| Degree of sagging | mm | 0 | 0 | 0 | 0 | 3 |
| Time to surface dry | min | 30 | 40 | 30 | 40 | 30 |
| Extrudability | mL/min | 640 | 556 | 582 | 284 | 780 |
| Tensile modulus (20HM/23 ℃) | MPa | 1.6 | 1.7 | 1.9 | 1.1 | 0.6 |
| Definite elongation adhesion | Without destruction | Without destruction | Without destruction | Without destruction | Without destruction | |
| Fixed-elongation cohesiveness after immersion in water | Without destruction | Without destruction | Without destruction | Without destruction | Without destruction | |
| Cold drawing-hot pressing adhesion | Without destruction | Without destruction | Without destruction | Without destruction | Without destruction | |
| Sprayability | Good taste | Good taste | Good taste | Difference (D) | Good taste | |
| Sag resistance | Height of | Height of | Height of | Height of | Is low in |
As can be seen from Table 6, the silane modified polyether sealant prepared in the examples of the present invention has both sag resistance of 0 and high extrudability, high sag resistance and sprayability, and also has good adhesion, high adhesion strength or high modulus. Comparative example 1 is a typical high sag resistant silane modified polyether sealant with higher performance and poorer sprayability. Comparative example 2 is a typical sprayable silane modified polyether sealant requiring the addition of more solvent or plasticizer which results in poor sag resistance and also results in lower bond strength or modulus.
The sprayable anti-sagging type silane modified polyether sealant prepared by the invention has the advantages of the traditional polyurethane adhesive and organic silica gel, is high in fixing strength, good in sealing performance, free of primer, simple in construction, strong in adhesive force, short in surface drying time, capable of being coated, extremely low in smell, high in elasticity and capable of improving the anti-seismic performance of a sealing element. The sealant product of the example completed 1m in 10 seconds with about 60g of glue2The surface to be bonded is sprayed and constructed, the concave-convex shape of the sizing material is kept, the collapse is avoided, the assembly process is simple, the working procedures are reduced, the production speed is accelerated, and the cost is reduced.
The self-made reactive diluent is introduced to be combined with the thixotropic agent, and the high-performance spray coating paint has excellent spray coating property, high sag resistance and high bonding strength by a formula design taking viscosity, thixotropy, consistency and the like into consideration, meets the requirements of high-efficiency spray coating construction capability and deformation resistance, plasticity and attractiveness, and provides high-quality performance experience and higher economic benefit.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (8)
1. A sprayable anti-sagging silane modified polyether sealant is characterized in that: the paint comprises the following components in parts by mass: 60-100 parts of silane-terminated polyether, 30-60 parts of reactive diluent, 40-60 parts of plasticizer, 120-200 parts of filler, 0.1-16 parts of pigment, 0.5-5 parts of ultraviolet absorber, 0.5-5 parts of light stabilizer, 1-12 parts of thixotropic agent, 1-10 parts of water removing agent, 1-10 parts of coupling agent and 0.1-5 parts of catalyst; the reactive diluent is silane modified polyether;
the reactive diluent is prepared from the following components: 4-14 parts by mass of polyether, 4-10 parts by mass of modifier and 0.3-3 parts by mass of end capping agent; the modifier is isocyanate silane; the end-capping agent is an amino hydrocarbon silane;
the preparation method of the reactive diluent comprises the following steps: mixing polyether and a modifier, heating to 70-85 ℃, and reacting for 0.5-2 h; cooling to below 50 ℃, adding an end-capping reagent, and reacting for 20-40 min to obtain the reactive diluent.
2. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the silane terminated polyether is selected from at least one of silyl terminated polyether, dimethoxy silane and triethoxy silane mixed terminated polyether.
3. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the plasticizer is selected from at least one of phthalate plasticizers, fatty acid ester plasticizers, phosphate plasticizers and epoxy ester plasticizers.
4. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the filler is at least one selected from calcium carbonate, calcium silicate, diatomite, kaolin, montmorillonite and talcum powder.
5. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the thixotropic agent is at least one of polyamide wax, hydrogenated castor oil, fumed silica and organic bentonite.
6. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the water removing agent is a silane water removing agent.
7. The sprayable sag-resistant silane-modified polyether sealant of claim 1, wherein: the coupling agent is a silane coupling agent.
8. A preparation method of the sprayable anti-sagging silane modified polyether sealant as defined in any one of claims 1 to 7, is characterized in that: the method comprises the following steps:
1) adding silane-terminated polyether, a reactive diluent, a plasticizer, a filler, a pigment, an ultraviolet absorbent, a light stabilizer and a thixotropic agent into a stirring kettle, stirring under vacuum, and heating to 100-120 ℃ to obtain a dry paste;
2) and cooling the dried paste to below 50 ℃, adding a water removing agent, a coupling agent and a catalyst, mixing and stirring to obtain the sprayable anti-sagging type silane modified polyether sealant.
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