CN115594929B - High-wear-resistance combined sealing filler for dryer and filter as well as preparation method and application thereof - Google Patents

High-wear-resistance combined sealing filler for dryer and filter as well as preparation method and application thereof Download PDF

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CN115594929B
CN115594929B CN202211133314.XA CN202211133314A CN115594929B CN 115594929 B CN115594929 B CN 115594929B CN 202211133314 A CN202211133314 A CN 202211133314A CN 115594929 B CN115594929 B CN 115594929B
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fluororubber
carbon black
resistant
sealing filler
high wear
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CN115594929A (en
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王陈利
孙利杰
任宪知
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Zhejiang Cps Cathay Packing & Sealing Co ltd
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Zhejiang Cps Cathay Packing & Sealing Co ltd
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    • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
    • C08L27/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers
    • C08L27/02—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment
    • C08L27/12—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a halogen; Compositions of derivatives of such polymers not modified by chemical after-treatment containing fluorine atoms
    • C08L27/16—Homopolymers or copolymers or vinylidene fluoride
    • C—CHEMISTRY; METALLURGY
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    • C08L33/00—Compositions of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and only one being terminated by only one carboxyl radical, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Compositions of derivatives of such polymers
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    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/0056—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof characterised by the compounding ingredients of the macro-molecular coating
    • D06N3/0063—Inorganic compounding ingredients, e.g. metals, carbon fibres, Na2CO3, metal layers; Post-treatment with inorganic compounds
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/042—Acrylic polymers
    • D—TEXTILES; PAPER
    • D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/04—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
    • D06N3/047—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds with fluoropolymers
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N3/00—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof
    • D06N3/12—Artificial leather, oilcloth or other material obtained by covering fibrous webs with macromolecular material, e.g. resins, rubber or derivatives thereof with macromolecular compounds obtained otherwise than by reactions only involving carbon-to-carbon unsaturated bonds, e.g. gelatine proteins
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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    • C08K3/22—Oxides; Hydroxides of metals
    • C08K2003/2217—Oxides; Hydroxides of metals of magnesium
    • C08K2003/222—Magnesia, i.e. magnesium oxide
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    • C08L2201/00—Properties
    • C08L2201/08—Stabilised against heat, light or radiation or oxydation
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    • D06N—WALL, FLOOR, OR LIKE COVERING MATERIALS, e.g. LINOLEUM, OILCLOTH, ARTIFICIAL LEATHER, ROOFING FELT, CONSISTING OF A FIBROUS WEB COATED WITH A LAYER OF MACROMOLECULAR MATERIAL; FLEXIBLE SHEET MATERIAL NOT OTHERWISE PROVIDED FOR
    • D06N2201/00—Chemical constitution of the fibres, threads or yarns
    • D06N2201/02—Synthetic macromolecular fibres
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Abstract

The invention relates to the field of sealing fillers, and provides a high wear-resistant combined sealing filler for a dryer and a filter as well as a preparation method and application thereof, aiming at the problem of poor wear resistance of the sealing filler, wherein the high wear-resistant combined sealing filler comprises, by mass, 100 parts of fluororubber, 10-20 parts of magnesium oxide, 15-35 parts of carbon black, 5-10 parts of an accelerator and 3-6 parts of a vulcanizing agent, and the carbon black contains 30-50wt% of high wear-resistant carbon black. The invention selects the high-temperature-resistant and wear-resistant fluororubber, and adds a proper amount of high-wear-resistant carbon black to further improve the wear resistance of the fluororubber. The preparation of the sealing filler comprises the following steps: 1) Adding the raw materials of the sealing filler into mixing equipment, and mixing for 2-10 min at 90-110 ℃ to obtain fluororubber compound; 2) And vulcanizing and molding the fluororubber compound. The invention also provides application of the sealing filler, and the sealing filler is compounded with the aramid cloth to prepare the fluororubber clamp cloth combined V-shaped sealing ring, and the aramid cloth has an abrasion-resistant effect.

Description

High-wear-resistance combined sealing filler for dryer and filter as well as preparation method and application thereof
Technical Field
The invention relates to the field of sealing fillers, in particular to a high wear-resistant combined sealing filler for a dryer and a filter, and a preparation method and application thereof.
Background
When the vacuum drying mechanism is used for vacuum drying, if the tightness is not good enough, excessive energy consumption and cost increase of external equipment can be caused, and the workpiece can not be sufficiently dried due to insufficient contact with gas, so that the workpiece is not thoroughly dried and is damaged in the following working procedures and the workpiece. The clamping cloth combined V-shaped seal is a seal form commonly used for a dryer filter, for example, patent CN212775007U discloses a V-shaped combined seal piece which is provided with a compression ring, a V-shaped seal ring and a support ring, so that the piston rod is sealed, the seal stability is strong, the structure is optimized, and the service life is long; meanwhile, the number of the V-shaped sealing rings can be increased or decreased, so that the piston rod is suitable for piston rods of different specifications, and the service performance is enhanced. However, the sealing element is mainly formed by optimizing the sealing performance through the structure, on one hand, the structure is complex and is not beneficial to manufacture, and on the other hand, the high temperature resistance and the wear resistance of the material per se are limited, for example, the V-shaped sealing of the clamping cloth combination is usually manufactured by clamping the nitrile rubber cotton fiber, and the nitrile rubber can only be used for a long time in the environment below 100 ℃. An ideal solution is therefore needed.
Disclosure of Invention
In order to overcome the problem of poor wear resistance of the sealing filler, the invention provides the high wear-resistant combined sealing filler for the dryer and the filter, wherein high-temperature-resistant and wear-resistant fluororubber is selected, and a proper amount of high wear-resistant carbon black is added to further improve the wear resistance of the fluororubber.
In order to achieve the above purpose, the present invention adopts the following technical scheme:
the high wear-resistant combined sealing filler for the dryer and the filter comprises, by mass, 100 parts of fluororubber, 10-20 parts of magnesium oxide, 15-35 parts of carbon black, 5-10 parts of an accelerator and 3-6 parts of a vulcanizing agent, wherein the carbon black contains 30-50wt% of high wear-resistant carbon black. The fluororubber has excellent heat resistance, oil resistance, corrosion resistance, wear resistance and atmospheric aging resistance, and the excellent physical and mechanical properties of the fluororubber enable the fluororubber to be suitable for various fluctuating working condition environments. The carbon black is used for reinforcement, and the high wear-resistant carbon black can further improve the wear resistance of the fluororubber, but the dosage of the high wear-resistant carbon black needs to be controlled in a reasonable range to exert the best effect.
Preferably, the carbon black is N990 and the highly abrasion resistant carbon black is N330. The advantages of carbon black N990 are mainly expressed in that: 1. particle size and distribution, average particle size of 280nm, nitrogen surface area of 7-11 square meters per gram, sulfonic value of 10 grams per kilogram, CTAB method surface area of 9 square meters per gram; 2. the particles have a very low degree of aggregation or structure, and are shown as a plurality of individual spherical carbon black particles, the other part of the particles consist of a small number of fusion particles, and the overall aggregation degree is very low compared with other varieties of carbon black. Carbon black N330 is a product with good reinforcing performance, and can endow colloidal particles with good stretching performance, tear resistance, wear resistance and elasticity.
Preferably, the fluororubber contains polyhydroxy fluororubber; the high wear-resistant carbon black is modified by an epoxy silane coupling agent, and comprises the following steps: dispersing high wear-resistant carbon black in ethanol solution, heating to 40-60 ℃, adding epoxy silane coupling agent, carrying out reflux reaction under stirring for 2-3 h, and filtering the reaction solution to obtain the silane modified carbon black.
The high wear-resistant carbon black is modified by the epoxy silane coupling agent, so that the high wear-resistant carbon black is not only favorable for dispersion, but also has epoxy groups which are easy to participate in reaction on the surface, and the fluororubber contains polyhydroxy fluororubber, so that the epoxy groups can be attacked to react under the catalysis of tertiary amine at about 100 ℃. The hydroxyl fluororubber and the modified high wear-resistant carbon black undergo a crosslinking reaction to generate a network structure, the fluororubber coats the high wear-resistant carbon black therein, and the two are more reliably connected. Therefore, on one hand, the surface of the high wear-resistant carbon black is coated, so that the wear resistance can be improved, and on the other hand, the high wear-resistant carbon black is not easy to fall off and has good stability.
Preferably, the epoxy silane coupling agent is 3- (2, 3-glycidoxy) propyl trimethoxy silane or 3- (2, 3-glycidoxy) propyl methyl dimethoxy silane, and the mass ratio of the epoxy silane coupling agent to the high abrasion resistant carbon black is (1-4): 5.
Preferably, the conditions for the dispersion are: ultrasound is 0.5-1 h under 200-220W power.
Preferably, the fluororubber contains 10-30wt% of polyhydroxy fluororubber, and the hydroxyl functionality of the polyhydroxy fluororubber is 2-4. The polyhydroxy fluororubber is a polyol taking vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene chloride copolymer, fluoroether rubber or fluorinated phosphazene rubber as a matrix or a fluoroacrylate copolymer polyol. Further preferred is a hydroxyl-terminated vinylidene fluoride-chlorotrifluoroethylene copolymer type liquid fluororubber having a molecular weight of 860 g/mol.
The invention also provides a preparation method of the high wear-resistant combined sealing filler for the dryer and the filter, which comprises the following steps:
1) Adding the raw materials of the sealing filler into mixing equipment, and mixing for 2-10 min at 90-110 ℃ to obtain fluororubber compound;
2) And (3) vulcanizing and molding the fluororubber compound obtained in the step (1).
Preferably, the fluororubber in the raw material of the sealing filler contains polyhydroxy fluororubber, the high wear-resistant carbon black is modified by an epoxy silane coupling agent, tertiary amine is further added during mixing in the step 1), and the tertiary amine is selected from bis (dimethylaminoethyl) ether, N-methylmorpholine or triethylenediamine, and the consumption of the tertiary amine is 0.5-2% of the sum of the mass of the raw materials of the sealing filler.
The invention also provides application of the high wear-resistant combined sealing filler for the dryer and the filter, and the sealing filler is compounded with the aramid cloth to prepare the fluororubber clamp cloth combined V-shaped sealing ring, and the following steps can be referred to by adopting the prior art:
(1) Preparation of fluororubber cloth
The sealing filler (namely fluororubber compound in the preparation method) is thinned into 0.5-2 mm slices, the slices are separated into strips and then added into a stirring machine together with a mixed solvent, and the mixed solvent is stirred for 2-4 hours to obtain fluororubber slurry, wherein the mixed solvent consists of solvents with the following mass ratio, namely, methyl isobutyl ketone, butyl acetate, no. 120 solvent gasoline=100-150:50-100:20-50, and the mass ratio of the fluororubber compound to the mixed solvent is 1:2.5-3.5; coating the obtained fluorine rubber slurry on aramid cloth through a knife coater, and drying to obtain fluorine rubber cloth;
(2) Preparation of V-shaped sealing ring with fluororubber cloth
And (3) pre-forming the fluororubber clamping cloth, then, putting the fluororubber clamping cloth into a vulcanization mold, vulcanizing the fluororubber clamping cloth on a flat vulcanizing machine for 10-30 min at 165-175 ℃, trimming the flash, performing secondary vulcanization for 2-4 h at 200-230 ℃ to obtain a fluororubber clamping cloth V-shaped sealing ring, and combining the obtained fluororubber clamping cloth V-shaped sealing rings to obtain the fluororubber clamping cloth combined V-shaped sealing ring.
Therefore, the invention has the beneficial effects that: (1) The high-temperature-resistant and wear-resistant fluororubber is selected, and a proper amount of high-wear-resistant carbon black is added to further improve the wear resistance of the fluororubber; (2) The hydroxyl fluororubber and the modified high wear-resistant carbon black undergo a crosslinking reaction to generate a network structure, the fluororubber coats the high wear-resistant carbon black therein, and the two are more reliably connected. Therefore, on one hand, the surface of the high wear-resistant carbon black is coated, so that the wear resistance can be improved, and on the other hand, the high wear-resistant carbon black is not easy to fall off and has good stability. (3) The fluororubber and the aramid cloth are combined, so that the wear resistance of the sealing filler is further improved.
Description of the embodiments
The technical scheme of the invention is further described through specific embodiments.
In the present invention, unless otherwise specified, the materials and equipment used are commercially available or are commonly used in the art, and the methods in the examples are conventional in the art unless otherwise specified.
General examples
The high wear-resistant combined sealing filler for the dryer and the filter comprises, by mass, 100 parts of fluororubber, 10-20 parts of magnesium oxide, 15-35 parts of carbon black, 5-10 parts of an accelerator and 3-6 parts of a vulcanizing agent, wherein the carbon black contains 30-50wt% of high wear-resistant carbon black.
The preparation method of the high wear-resistant combined sealing filler for the dryer and the filter comprises the following steps:
1) Adding the raw materials of the sealing filler into mixing equipment, and mixing for 2-10 min at 90-110 ℃ to obtain fluororubber compound;
2) And (3) vulcanizing and molding the fluororubber compound obtained in the step (1). The vulcanization temperature of the primary vulcanization is 140-160 ℃ and the vulcanization time is 0.5h; the second-stage vulcanization is carried out at normal temperature for vulcanizing 1 h, then sequentially heating to 90-110 ℃ and 110-130 ℃ for vulcanizing 1 h respectively, heating to 150 ℃ for vulcanizing 0.5h, continuously heating to 200 ℃ for vulcanizing 12 h, and finally cooling to below 80 ℃ for blanking. The molding pressure is 20 MPa, the temperature is 170-180 ℃ and the time is 10-15 min.
Preferably, the fluororubber contains 10-30wt% of polyhydroxy fluororubber, and the hydroxyl functionality of the polyhydroxy fluororubber is 2-4. The polyhydroxy fluororubber is a polyol taking vinylidene fluoride-hexafluoropropylene copolymer, vinylidene fluoride-tetrafluoroethylene chloride copolymer, fluoroether rubber or fluorinated phosphazene rubber as a matrix or a fluoroacrylate copolymer polyol.
The high wear-resistant carbon black is modified by an epoxy silane coupling agent, and comprises the following steps: dispersing high wear-resistant carbon black in ethanol solution, heating to 40-60 ℃, adding epoxy silane coupling agent, carrying out reflux reaction under stirring for 2-3 h, and filtering the reaction solution to obtain the silane modified carbon black. The epoxy silane coupling agent is 3- (2, 3-glycidoxy) propyl trimethoxy silane or 3- (2, 3-glycidoxy) propyl methyl dimethoxy silane, and the mass ratio of the epoxy silane coupling agent to the carbon black N330 is (1-4): 5. The dispersing condition is that the ultrasonic wave is 0.5-1 h under the power of 200-220W.
In the step 1) of the preparation, tertiary amine is also added during mixing, wherein the tertiary amine is selected from bis (dimethylaminoethyl) ether, N-methylmorpholine or triethylenediamine, and the use amount of the tertiary amine is 0.5-2% of the sum of the mass of the raw materials of the sealing filler.
The application of the high wear-resistant combined sealing filler for the dryer and the filter is that the sealing filler is compounded with the aramid cloth to prepare the fluororubber clamp cloth combined V-shaped sealing ring, and the following steps are referred to:
(1) Preparation of fluororubber cloth
The sealing filler (namely fluororubber compound in the preparation method) is thinned into 0.5-2 mm slices, the slices are separated into strips and then added into a stirring machine together with a mixed solvent, and the mixed solvent is stirred for 2-4 hours to obtain fluororubber slurry, wherein the mixed solvent consists of solvents with the following mass ratio, namely, methyl isobutyl ketone, butyl acetate, no. 120 solvent gasoline=100-150:50-100:20-50, and the mass ratio of the fluororubber compound to the mixed solvent is 1:2.5-3.5; coating the obtained fluorine rubber slurry on aramid cloth through a knife coater, and drying to obtain fluorine rubber cloth;
(2) Preparation of V-shaped sealing ring with fluororubber cloth
And (3) pre-forming the fluororubber clamping cloth, then, putting the fluororubber clamping cloth into a vulcanization mold, vulcanizing the fluororubber clamping cloth on a flat vulcanizing machine for 10-30 min at 165-175 ℃, trimming the flash, performing secondary vulcanization for 2-4 h at 200-230 ℃ to obtain a fluororubber clamping cloth V-shaped sealing ring, and combining the obtained fluororubber clamping cloth V-shaped sealing rings to obtain the fluororubber clamping cloth combined V-shaped sealing ring.
Example 1
The high wear-resistant combined sealing filler for the dryer and the filter is prepared from 10 kg fluororubber, 1.5 kg magnesia, 1.5 kg carbon black N990, 1 kg high wear-resistant carbon black N330, 0.7 kg accelerator M4 (TDN-204 resin) and 0.5 kg of 3# vulcanizing agent.
The preparation method of the high wear-resistant combined sealing filler for the dryer and the filter comprises the following steps:
1) Adding the raw materials of the sealing filler into mixing equipment, and mixing at 100 ℃ for 8 min to obtain fluororubber compound;
2) And (3) vulcanizing and molding the fluororubber compound obtained in the step (1). The vulcanization temperature of the primary vulcanization is 150 ℃ and the vulcanization time is 0.5h; the second-stage vulcanization is carried out at normal temperature for vulcanizing 1 h, then sequentially heating to 100 ℃ and 120 ℃ for vulcanizing 1 h respectively, heating to 150 ℃ for vulcanizing 0.5h, continuously heating to 200 ℃ for vulcanizing 12 h, and finally cooling to below 80 ℃ for blanking. The molding pressure is 20 MPa, the temperature is 180 ℃ and the time is 12 min.
The application of the high wear-resistant combined sealing filler for the dryer and the filter comprises the following steps:
(1) The fluororubber compound obtained in the step 1) is thinned into 1 mm sheets, the sheets are separated into strips, the strips and a mixed solvent are added into a stirrer, and the mixed solvent is stirred for 3 h to obtain fluororubber slurry, wherein the mixed solvent consists of solvents with the following mass ratio, namely methyl isobutyl ketone, butyl acetate, no. 120 solvent gasoline=100:50:30, and the mass ratio of the fluororubber compound to the mixed solvent is 1:3; coating the obtained fluorine rubber slurry on aramid cloth through a knife coater, and drying to obtain fluorine rubber cloth;
(2) Preparation of V-shaped sealing ring with fluororubber cloth
And (3) pre-forming the fluororubber clamping cloth, then filling the fluororubber clamping cloth into a vulcanization mold, vulcanizing the fluororubber clamping cloth on a flat vulcanizing machine at 170 ℃ for 20 min, trimming the flash, secondarily vulcanizing the fluororubber clamping cloth at 220 ℃ for 3 h to obtain a fluororubber clamping cloth V-shaped sealing ring, and combining the obtained fluororubber clamping cloth V-shaped sealing rings to obtain the fluororubber clamping cloth combined V-shaped sealing ring.
Example 2
The high wear-resistant combined sealing filler for the dryer and the filter is prepared from 10 kg fluororubber, 1.5 kg magnesia, 1.5 kg carbon black N990, 1 kg modified high wear-resistant carbon black, 0.7 kg accelerator M4 (TDN-204 resin) and 0.5 kg of 3# vulcanizing agent. The fluororubber contains 2 kg polyhydroxy fluororubber, and the polyhydroxy fluororubber is a fluoroacrylate copolymer polyol with hydroxyl functionality of 3.
The preparation method of the modified high wear-resistant carbon black comprises the following steps: dispersing high wear-resistant carbon black N330 in ethanol solution, carrying out ultrasonic treatment at 200W power for 1 h, heating to 50 ℃, adding 0.6 kg of 3- (2, 3-glycidoxy) propyl trimethoxy silane, carrying out reflux reaction for 2 h under stirring, and filtering the reaction solution to obtain the silane modified carbon black.
The preparation method of the high wear-resistant combined sealing filler for the dryer and the filter comprises the following steps: 1) Adding the raw materials of the sealing filler and 7.6 kg triethylene diamine into mixing equipment, and mixing at 100 ℃ for 8 min to obtain fluororubber compound;
2) And (3) vulcanizing and molding the fluororubber compound obtained in the step (1). The vulcanization temperature of the primary vulcanization is 150 ℃ and the vulcanization time is 0.5h; the second-stage vulcanization is carried out at normal temperature for vulcanizing 1 h, then sequentially heating to 100 ℃ and 120 ℃ for vulcanizing 1 h respectively, heating to 150 ℃ for vulcanizing 0.5h, continuously heating to 200 ℃ for vulcanizing 12 h, and finally cooling to below 80 ℃ for blanking. The molding pressure is 20 MPa, the temperature is 180 ℃ and the time is 12 min.
The application of the combined sealing filler with high wear resistance for the dryer and the filter is the same as in the embodiment 1.
Example 3
The difference from example 2 is that the fluororubber contains 4 kg polyhydroxy fluororubber.
Comparative example 1
The difference from example 1 is that the feedstock does not contain highly abrasion resistant carbon black N330, which is supplemented with carbon black N990.
Comparative example 2
The difference from example 1 is that the mass of highly abrasion resistant carbon black N330 in the raw material is 2 kg.
Comparative example 3
The difference from example 2 is that the fluororubber does not contain polyhydroxy fluororubber.
Performance testing
The heat-resistant and wear-resistant performance of the sealing fillers prepared in each of the examples and comparative examples was tested. Wherein, heat resistance test conditions: according to GB/T3512-2001 test, placing the material in an aging test box, and performing a 72 h hot air aging test at 70 ℃; wear resistance test conditions: the amount of abrasion of the material was determined according to GB/T1689-1998.
The results are shown in the following table.
Tensile Strength Change Rate% Rate of hardness change% Abrasion index
Example 1 -10 3 150
Example 2 -7 1 168
Example 3 -7 2 161
Comparative example 1 -12 6 132
Comparative example 2 -11 5 145
Comparative example 3 -8 2 157
As can be seen from the table, in the embodiment 1 of the invention, the high-temperature-resistant and wear-resistant fluororubber is selected, and the proper amount of high-wear-resistant carbon black is added, so that the wear resistance of the fluororubber is further improved. Comparative example 1 does not contain high wear carbon black, comparative example 2 has too much high wear carbon black and the seal filler has less wear resistance than example 1.
In the embodiment 2, epoxy silane modification is carried out on the high-wear-resistance carbon black, and the fluororubber containing hydroxyl is added into the fluororubber, so that crosslinking reaction is generated between the epoxy silane modification and the fluororubber, and the wear resistance of the sealing filler is obviously improved. In example 3, the excessive amount of the hydroxyl group-containing fluororubber adversely decreases the abrasion resistance of the seal filler, and it is presumed that the excessive coating affects the action of the highly abrasion-resistant carbon black. Comparative example 3, in which only the high abrasion carbon black was subjected to the epoxysilane modification, did not add the hydroxyl group-containing fluororubber to the fluororubber, and was better than example 1 but not as good as example 2, it was revealed that although the silane modification of the high abrasion carbon black could improve the dispersibility of the high abrasion carbon black, the improvement of the abrasion resistance of the present invention was more dependent on the crosslinking reaction of the epoxysilane and the hydroxyfluororubber.
The present invention is not limited to the above-mentioned embodiments, but is intended to be limited to the following embodiments, and any modifications, equivalent changes and variations in the above-mentioned embodiments can be made by those skilled in the art without departing from the scope of the present invention.

Claims (6)

1. The high wear-resistant combined sealing filler for the dryer and the filter is characterized by comprising, by mass, 100 parts of fluororubber, 10-20 parts of magnesium oxide, 15-35 parts of carbon black, 5-10 parts of an accelerator and 3-6 parts of a vulcanizing agent, wherein the carbon black contains 30-50wt% of high wear-resistant carbon black;
the fluororubber contains 10-30wt% of polyhydroxy fluororubber, and the hydroxyl functionality of the polyhydroxy fluororubber is 2-4;
the high wear-resistant carbon black is modified by an epoxy silane coupling agent, and comprises the following steps: dispersing high wear-resistant carbon black in ethanol solution, heating to 40-60 ℃, adding epoxy silane coupling agent, carrying out reflux reaction under stirring for 2-3 h, and filtering the reaction solution to obtain silane modified carbon black;
the preparation method of the sealing filler comprises the steps of adding all raw materials of the sealing filler into mixing equipment for mixing to obtain fluororubber compound, and adding tertiary amine during mixing.
2. The combined sealing filler with high wear resistance for a dryer and a filter according to claim 1, wherein the epoxy silane coupling agent is 3- (2, 3-glycidoxy) propyltrimethoxysilane or 3- (2, 3-glycidoxy) propylmethyldimethoxysilane, and the mass ratio of the epoxy silane coupling agent to the high wear resistance carbon black is (1-4): 5.
3. The combined high wear seal filler for a dryer and filter according to claim 1 or 2, wherein the conditions of dispersion are: ultrasound is 0.5-1 h under 200-220W power.
4. The method for preparing the high wear-resistant combined sealing filler for the dryer and the filter as claimed in claim 1, which is characterized by comprising the following steps:
1) Adding the raw materials of the sealing filler into mixing equipment, and mixing for 2-10 min at 90-110 ℃ to obtain fluororubber compound;
2) And (3) vulcanizing and molding the fluororubber compound obtained in the step (1).
5. The method for preparing the high wear-resistant combined sealing filler for the drier and the filter according to claim 4, wherein the tertiary amine added during the mixing in the step 1) is selected from bis (dimethylaminoethyl) ether, N-methylmorpholine or triethylenediamine, and the tertiary amine is used in an amount of 0.5-2% of the sum of the mass of the raw materials of the sealing filler.
6. The use of the high wear-resistant combined sealing filler for a dryer and a filter as claimed in claim 1, wherein the sealing filler is compounded with aramid cloth to prepare a fluororubber clamp cloth combined V-shaped sealing ring.
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104356563A (en) * 2014-11-17 2015-02-18 中昊晨光化工研究院有限公司 High-temperature/pressure-resistant vapor-resistant fluororubber compounded rubber
CN108178892A (en) * 2018-02-05 2018-06-19 青岛科技大学 A kind of high intensity low pressure becomes fluorubber material and preparation method thereof
CN111004460A (en) * 2019-12-04 2020-04-14 西北橡胶塑料研究设计院有限公司 Fluororubber material for oil seal and preparation method thereof
CN112625386A (en) * 2019-09-24 2021-04-09 中昊晨光化工研究院有限公司 Fluororubber compound and preparation method and application thereof

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Publication number Priority date Publication date Assignee Title
CN100354358C (en) * 2003-04-21 2007-12-12 Nok株式会社 Method for producing low-friction fluorine rubber crosslinked body

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Publication number Priority date Publication date Assignee Title
CN104356563A (en) * 2014-11-17 2015-02-18 中昊晨光化工研究院有限公司 High-temperature/pressure-resistant vapor-resistant fluororubber compounded rubber
CN108178892A (en) * 2018-02-05 2018-06-19 青岛科技大学 A kind of high intensity low pressure becomes fluorubber material and preparation method thereof
CN112625386A (en) * 2019-09-24 2021-04-09 中昊晨光化工研究院有限公司 Fluororubber compound and preparation method and application thereof
CN111004460A (en) * 2019-12-04 2020-04-14 西北橡胶塑料研究设计院有限公司 Fluororubber material for oil seal and preparation method thereof

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