CN111154272A - Wear-resistant silica gel key and production process thereof - Google Patents
Wear-resistant silica gel key and production process thereof Download PDFInfo
- Publication number
- CN111154272A CN111154272A CN202010040493.7A CN202010040493A CN111154272A CN 111154272 A CN111154272 A CN 111154272A CN 202010040493 A CN202010040493 A CN 202010040493A CN 111154272 A CN111154272 A CN 111154272A
- Authority
- CN
- China
- Prior art keywords
- portions
- silica gel
- key
- gel key
- vulcanization
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
- C08L83/04—Polysiloxanes
- C08L83/08—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K2201/00—Specific properties of additives
- C08K2201/014—Additives containing two or more different additives of the same subgroup in C08K
-
- 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
-
- 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
-
- 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
-
- 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
- C08L2205/03—Polymer mixtures characterised by other features containing three or more polymers in a blend
- C08L2205/035—Polymer mixtures characterised by other features containing three or more polymers in a blend containing four or more polymers in a blend
Landscapes
- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The invention relates to the technical field of silica gel key production, in particular to a wear-resistant silica gel key and a production process thereof; the traditional Chinese medicine composition is prepared from the following raw materials in parts by weight: 100 portions of modified fluorosilicone rubber, 130 portions of methyl silicone rubber, 25 portions to 35 portions of methyl silicone rubber, 8.5 portions to 10 portions of SI-TUFF silicon carbide, 3.2 portions to 4.0 portions of matting powder, 5.5 portions to 7.0 portions of micro-pulverized wax, 6.5 portions to 8.0 portions of microcrystalline cellulose, 1.8 portions to 2.5 portions of stabilizer, 10 portions to 15 portions of additive, 0.5 portion to 1.6 portions of vulcanizing agent and 3 portions to 10 portions of filler; the silica gel key produced by the invention has good scratch resistance and ageing resistance; but also has good wear resistance; in addition, the smoothness of the surface of the silica gel key produced by the invention is effectively improved, and the hand feeling of the silica gel key is improved.
Description
Technical Field
The invention relates to the technical field of silica gel key production, in particular to a wear-resistant silica gel key and a production process thereof.
Background
Silica gel is called silicon rubber, is a high-activity adsorption material, belongs to an amorphous substance, and has a chemical molecular formula of mSiO 2. nH 2O. Insoluble in water and any solvent, non-toxic, odorless, stable in chemical property, and non-reactive with any substance except strong alkali and hydrofluoric acid. Different types of silica gel form different microporous structures due to different manufacturing methods.
The silica gel key is a key product made of silica gel as a raw material, belongs to a product category of silica gel products, and has the characteristics of excellent heat resistance, cold resistance, environmental resistance, electric insulation, fatigue resistance and the like. Silica gel keys are often used in electronic calculators, remote controllers, telephones, wireless telephones, electronic toys, computer keyboards, learning machine keys, scrambler keys, and digital product keys.
However, although the existing silica gel key has good heat resistance, the wear resistance of the existing silica gel key is relatively poor, so that the service life of the existing silica gel key is correspondingly shortened. Furthermore, the surface smoothness is relatively poor, i.e., the hand is relatively poor.
Disclosure of Invention
The first purpose of the invention is to provide a wear-resistant silica gel key, which has the advantages that: the silica gel key produced by the invention has good scratch resistance and ageing resistance, and also has good wear resistance, and the hand feeling of the silica gel key is improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a wear-resistant silica gel key is prepared from the following raw materials in parts by weight: 100 portions of modified fluorosilicone rubber, 130 portions of methyl silicone rubber, 25 portions to 35 portions of methyl silicone rubber, 8.5 portions to 10 portions of SI-TUFF silicon carbide, 3.2 portions to 4.0 portions of matting powder, 5.5 portions to 7.0 portions of micro-pulverized wax, 6.5 portions to 8.0 portions of microcrystalline cellulose, 1.8 portions to 2.5 portions of stabilizing agent, 10 portions to 15 portions of additive, 0.5 portion to 1.6 portions of vulcanizing agent and 3 portions to 10 portions of filling agent.
By adopting the technical scheme, the modified fluorosilicone rubber, the methyl silicone rubber, the SI-TUFF silicon carbide, the matting powder, the micronized wax and the microcrystalline cellulose are used as raw materials for preparing the wear-resistant silicone rubber key, wherein the use of the SI-TUFF silicon carbide, the matting powder and the micronized wax can obviously improve the scratch resistance and the wear resistance of the modified fluorosilicone rubber and the methyl silicone rubber. The wear resistance of the prepared silica gel key is greatly improved; due to the use of microcrystalline cellulose, the smoothness of the surface of the silica gel key produced by the invention is effectively improved, and the hand feeling of the silica gel key is improved.
The invention is further configured to: the preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane with the mass ratio of 90-100:1 into ethyl acetate, reacting for 5-8h at 60-70 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, transferring the silicon powder into a drying oven for drying treatment, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 5-8 times of deionized water and 0.4-0.6% of potassium persulfate into the reaction kettle by mass respectively, uniformly mixing and stirring, reacting for 3-5h at 50-70 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder;
c. putting the fluorosilicone rubber into a double-roll open mill, adding 20-30% by mass of white carbon black, 6-10% by mass of N, N' -m-phenylene bismaleimide and 12-18% by mass of modified silica fume into the double-roll open mill, mixing for 45-60min, discharging, standing at room temperature for 8-12h, and then carrying out remixing, simultaneously adding 0.8-1.5% by mass of a vulcanizing agent and 2.8-4.2% by mass of iridium trichloride into the open mill, and pressing out bubbles in the rubber material after remixing for 30-40 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 2-3 days under natural conditions to obtain the modified fluorosilicone rubber finished product.
By adopting the technical scheme, the invention modifies the micro silicon powder, then chemically modifies the fluorosilicone rubber by the modified micro silicon powder, and chemically modifies the micro silicon powder to enable the micro silicon powder and the 3-mercaptopropyltriethoxysilane to take chemical bonds with larger bond energy as connecting links, thereby successfully realizing the purpose of grafting the 3-mercaptopropyltriethoxysilane on the surface of the micro silicon powder and improving the chemical reaction activity of the micro silicon powder. 3-mercaptopropyltriethoxysilane is used as a bridge to connect the silica fume and the fluorosilicone rubber through chemical bonds, so that the chemical modification of the fluorosilicone rubber is realized. The modified fluorosilicone rubber not only has good weather resistance and aging resistance, but also has excellent wear resistance, thereby overcoming the technical defect of poor wear resistance commonly existing in silica gel materials and effectively prolonging the service life of silica gel keys.
The invention is further configured to: the matting powder is any one of superfine silicon dioxide, talcum powder and aluminum stearate.
By adopting the technical scheme, the use of the matting powder can not only obviously improve the scratch resistance and the wear resistance of the modified fluorosilicone rubber and the methyl silicone rubber. The abrasion resistance of the prepared silica gel key is also greatly improved.
The invention is further configured to: the type of the micro-powder wax is any one of YL-902 and YL-903.
By adopting the technical scheme, the use of the micronized wax can not only obviously improve the scratch resistance and the wear resistance of the silica gel key produced by the invention; can also improve the smoothness of the product.
The invention is further configured to: the stabilizing agent is epoxidized soybean oil.
By adopting the technical scheme, the epoxy soybean oil can slow down the reaction, ensure the stability of the modified fluorosilicone rubber and the methyl silicone rubber and prevent the decomposition and aging of the modified fluorosilicone rubber and the methyl silicone rubber.
The invention is further configured to: the additive is any one of methyl phenyl methoxy silicone oil and ethoxy end-capped polymethylsilicone oil.
By adopting the technical scheme, the additive can obviously improve the space structure of the prepared silica gel key, so that the prepared silica gel key has excellent wear resistance.
The invention is further configured to: the vulcanizing agent is any one of epoxy resin or sulfur.
By adopting the technical scheme, the vulcanizing agent can convert the linear molecular structures of the modified fluorine silicon rubber and the methyl silicone rubber into a three-dimensional net-shaped mechanism, so that the physical properties of the produced silica gel key are obviously improved.
The invention is further configured to: the filler is any one of quartz powder and nano zinc oxide.
By adopting the technical scheme, the filler can not only obviously improve the wear resistance and mechanical strength of the silica gel key, but also obviously improve the ageing resistance and prolong the service life of the silica gel key.
The second purpose of the invention is to provide a production process of a wear-resistant silica gel key, which has the advantages that: the silica gel key produced by the invention has good scratch resistance and ageing resistance, and also has good wear resistance, and the hand feeling of the silica gel key is improved.
In order to achieve the purpose, the invention provides the following technical scheme:
a production process of a wear-resistant silica gel key comprises the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 30-40min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 10-15min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein, the temperature is set to be 190-210 ℃ during the secondary vulcanization, and the heating time is 2-3 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
By adopting the technical scheme, the silica gel key produced by the invention not only has good scratch resistance and ageing resistance, but also has good wear resistance. In addition, due to the use of microcrystalline cellulose, the smoothness of the surface of the silica gel key produced by the invention is effectively improved, and the hand feeling of the silica gel key is improved.
In summary, the invention has the following advantages:
1. according to the invention, the micro silicon powder is modified, then the fluorosilicone rubber is chemically modified by the modified micro silicon powder, and the micro silicon powder is chemically modified to enable the micro silicon powder and 3-mercaptopropyltriethoxysilane to be connected by a chemical bond with larger bond energy, so that the 3-mercaptopropyltriethoxysilane is successfully grafted on the surface of the micro silicon powder to improve the chemical reaction activity of the micro silicon powder. When the activated silica fume and the fluorosilicone rubber are transferred into an open mill together for mixing, the 3-mercaptopropyltriethoxysilane grafted on the surface of the activated silica fume and the fluorosilicone rubber are also connected in a chemical bond mode, so that the silica fume and the fluorosilicone rubber are connected through the chemical bond by taking the 3-mercaptopropyltriethoxysilane as a bridge, and the chemical modification of the fluorosilicone rubber is realized. The modified fluorosilicone rubber not only has good weather resistance and aging resistance, but also has excellent wear resistance, thereby overcoming the technical defect of poor wear resistance commonly existing in silica gel materials and effectively prolonging the service life of silica gel keys;
2. the wear-resistant silicone rubber key is prepared from modified fluorosilicone rubber, methyl silicone rubber, SI-TUFF silicon carbide, matting powder, micro-pulverized wax and microcrystalline cellulose, wherein the SI-TUFF silicon carbide, the matting powder and the micro-pulverized wax are used, so that the scratch resistance and the wear resistance of the modified fluorosilicone rubber and the methyl silicone rubber can be remarkably improved. The wear resistance of the prepared silica gel key is greatly improved; the use of the microcrystalline cellulose effectively improves the smoothness of the surface of the silica gel key produced by the invention and improves the hand feeling of the silica gel key.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments of the present invention without any inventive step, are within the scope of the present invention.
Example 1:
a wear-resistant silica gel key is prepared from the following raw materials in parts by weight: 110 parts of modified fluorosilicone rubber, 25 parts of methyl silicone rubber, 9 parts of SI-TUFF silicon carbide, 3.2 parts of flatting powder, 6.0 parts of micronized wax, 6.5 parts of microcrystalline cellulose, 2.0 parts of stabilizer, 10 parts of additive, 0.8 part of vulcanizing agent and 3 parts of filler.
The preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane with a mass ratio of 90:1 into ethyl acetate, reacting for 5 hours at 60 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, drying the silicon powder in a drying oven, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 5 times of deionized water and 0.4% of potassium persulfate into the reaction kettle, mixing and stirring uniformly, reacting for 3 hours at 50 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder;
c. putting fluorosilicone rubber into a double-roller open mill, adding 20% of white carbon black, 6% of N, N' -m-phenylene bismaleimide and 12% of modified silica fume into the double-roller open mill, mixing for 45min, then discharging rubber, standing for 8h at room temperature, and then performing remixing, simultaneously adding 0.8% of vulcanizing agent and 2.8% of iridium trichloride into the open mill, and pressing out bubbles in the rubber after remixing for 30 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 2 days under natural conditions to obtain the finished modified fluorosilicone rubber product.
The matting powder is selected from superfine silicon dioxide.
The micronized wax is available in the model number YL-902.
The stabilizer is epoxidized soybean oil.
The addition auxiliary agent is methyl phenyl methoxy silicone oil.
The vulcanizing agent is epoxy resin.
The filling agent is quartz powder.
A production process of a wear-resistant silica gel key comprises the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 30min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 10min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein the temperature during the secondary vulcanization is set to 190 ℃, and the heating time is 2 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
Example 2:
a wear-resistant silica gel key is prepared from the following raw materials in parts by weight: 100 parts of modified fluorosilicone rubber, 30 parts of methyl silicone rubber, 8.5 parts of SI-TUFF silicon carbide, 3.5 parts of flatting powder, 5.5 parts of micronized wax, 7.0 parts of microcrystalline cellulose, 1.8 parts of stabilizer, 12 parts of additive, 0.5 part of vulcanizing agent and 5 parts of filler.
The preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane with a mass ratio of 95:1 into ethyl acetate, reacting for 6 hours at 65 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, drying the silicon powder in a drying oven, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 6 times of deionized water and 0.45% of potassium persulfate into the reaction kettle, mixing and stirring uniformly, reacting for 4 hours at 55 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder; c. putting fluorosilicone rubber into a double-roller open mill, adding 25% by mass of white carbon black, 7% by mass of N, N' -m-phenylene bismaleimide and 14% by mass of modified silica fume into the double-roller open mill, mixing for 50min, then discharging rubber, standing for 9h at room temperature, and then performing remixing, simultaneously adding 1.0% by mass of a vulcanizing agent and 3.0% by mass of iridium trichloride into the open mill, and pressing out bubbles in the rubber material after remixing for 35 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 2 days under natural conditions to obtain the finished modified fluorosilicone rubber product.
The matting powder is talcum powder.
The micronized wax is YL-903.
The stabilizer is epoxidized soybean oil.
The addition auxiliary agent is ethoxy end-capped polymethylsilicone oil.
The vulcanizing agent is sulfur.
The filler is selected from nano zinc oxide.
A production process of a wear-resistant silica gel key comprises the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 35min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 12min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein the temperature during the secondary vulcanization is set to be 200 ℃, and the heating time is 2 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
Example 3:
a wear-resistant silica gel key is prepared from the following raw materials in parts by weight: 130 parts of modified fluorosilicone rubber, 35 parts of methyl silicone rubber, 10 parts of SI-TUFF silicon carbide, 3.8 parts of flatting powder, 7.0 parts of micronized wax, 7.5 parts of microcrystalline cellulose, 2.5 parts of a stabilizer, 14 parts of an additive, 1.6 parts of a vulcanizing agent and 7 parts of a filler.
The preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane in a mass ratio of 98:1 into ethyl acetate, reacting for 7 hours at 68 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, drying in a drying oven, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 7 times of deionized water and 0.5% of potassium persulfate into the reaction kettle, mixing and stirring uniformly, reacting for 4 hours at 60 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder; c. putting fluorosilicone rubber into a double-roller open mill, adding 28% of white carbon black, 8% of N, N' -m-phenylene bismaleimide and 16% of modified silica fume into the double-roller open mill, mixing for 55min, then discharging rubber, standing for 10h at room temperature, and then performing remixing, simultaneously adding 1.2% of vulcanizing agent and 3.5% of iridium trichloride into the open mill, and pressing out bubbles in the rubber after remixing for 35 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 3 days under natural conditions to obtain the finished modified fluorosilicone rubber product.
The matting powder is aluminum stearate.
The micronized wax is available in the model number YL-902.
The stabilizer is epoxidized soybean oil.
The addition auxiliary agent is methyl phenyl methoxy silicone oil.
The vulcanizing agent is epoxy resin.
The filling agent is quartz powder.
A production process of a wear-resistant silica gel key comprises the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 35min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 14min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein the temperature during the secondary vulcanization is set to be 205 ℃, and the heating time is 3 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
Example 4:
a wear-resistant silica gel key is prepared from the following raw materials in parts by weight: 120 parts of modified fluorosilicone rubber, 30 parts of methyl silicone rubber, 9.5 parts of SI-TUFF silicon carbide, 4.0 parts of matting powder, 6.5 parts of micronized wax, 8.0 parts of microcrystalline cellulose, 2.3 parts of a stabilizer, 15 parts of an additive, 1.2 parts of a vulcanizing agent and 10 parts of a filler.
The preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane with a mass ratio of 100:1 into ethyl acetate, reacting for 8 hours at 70 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, drying the silicon powder in a drying oven, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 8 times of deionized water and 0.6 percent of potassium persulfate into the reaction kettle, mixing and stirring uniformly, reacting for 5 hours at 70 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder;
c. putting fluorosilicone rubber into a double-roller open mill, adding 30% of white carbon black, 10% of N, N' -m-phenylene bismaleimide and 18% of modified silica fume into the double-roller open mill, mixing for 60min, then discharging rubber, standing for 12h at room temperature, and then performing remixing, simultaneously adding 1.5% of vulcanizing agent and 4.2% of iridium trichloride into the open mill, and pressing out bubbles in the rubber after remixing for 40 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 3 days under natural conditions to obtain the finished modified fluorosilicone rubber product.
The matting powder is selected from superfine silicon dioxide.
The micronized wax is YL-903.
The stabilizer is epoxidized soybean oil.
The addition auxiliary agent is ethoxy end-capped polymethylsilicone oil.
The vulcanizing agent is sulfur.
The filler is selected from nano zinc oxide.
A production process of a wear-resistant silica gel key comprises the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 40min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 15min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein, the temperature is set as 210 ℃ during the secondary vulcanization, and the heating time is 3 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
And (3) performance detection:
the performance of the silicone keys produced by the present invention provided in examples 1-4 (examples 1-4) and the commercially available silicone keys produced by the prior art (comparative) were tested and the data reported in the following table:
note: 1. the equipment used for the Arthrone abrasion test in the table is an Arthrone abrasion tester (GT-7012-A) which performs the test according to the standard GB-T1689-1998.
2. The equipment used for the DIN abrasion test in the table is a DIN abrasion tester (GT-7012-D) which performs the test according to the standard GB-T9867-1988.
3. During testing, 10 judges respectively touch each silica gel key of the comparative example and the embodiment, score the silica gel keys, and finally take the average value of the silica gel keys, wherein the full sliding performance is 10 scores.
The specific scores of the comparative examples and the examples are as follows:
| comparative example | 8 | 7 | 9 | 6 | 8 | 9 | 7 | 8 | 9 | 7 |
| Example 1 | 9 | 10 | 8 | 9 | 10 | 9 | 8 | 7 | 10 | 8 |
| Example 2 | 9 | 9 | 7 | 8 | 8 | 10 | 8 | 9 | 7 | 9 |
| Example 3 | 8 | 7 | 9 | 9 | 9 | 10 | 8 | 7 | 8 | 10 |
| Example 4 | 10 | 7 | 9 | 8 | 8 | 7 | 9 | 10 | 9 | 8 |
From the relevant data in the table, compared with the commercially available silica gel key produced by the existing process, the silica gel key produced by the invention has better wear resistance and smoothness, which shows that the silica gel key produced by the invention has better wear resistance and hand feeling, better market prospect and more suitability for popularization.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the design concept of the present invention should be included in the scope of the present invention.
Claims (9)
1. The wear-resistant silica gel key is characterized by being prepared from the following raw materials in parts by weight: 100 portions of modified fluorosilicone rubber, 130 portions of methyl silicone rubber, 25 portions to 35 portions of methyl silicone rubber, 8.5 portions to 10 portions of SI-TUFF silicon carbide, 3.2 portions to 4.0 portions of matting powder, 5.5 portions to 7.0 portions of micro-pulverized wax, 6.5 portions to 8.0 portions of microcrystalline cellulose, 1.8 portions to 2.5 portions of stabilizing agent, 10 portions to 15 portions of additive, 0.5 portion to 1.6 portions of vulcanizing agent and 3 portions to 10 portions of filling agent.
2. The wear-resistant silicone key according to claim 1, wherein the preparation method of the modified fluorosilicone rubber comprises the following steps:
a. adding silicon powder and 3-mercaptopropyltriethoxysilane with the mass ratio of 90-100:1 into ethyl acetate, reacting for 5-8h at 60-70 ℃, performing vacuum filtration and ultrasonic dispersion after the reaction is finished, soaking the obtained silicon powder into methanol, performing filtration treatment, transferring the silicon powder into a drying oven for drying treatment, and storing the obtained silicon powder for later use;
b. b, placing the silicon micropowder powder obtained in the step a into a reaction kettle, adding sodium dodecyl benzene sulfonate, 5-8 times of deionized water and 0.4-0.6% of potassium persulfate into the reaction kettle by mass respectively, uniformly mixing and stirring, reacting for 3-5h at 50-70 ℃, after the reaction is finished, carrying out vacuum filtration on the obtained solid product, washing the solid product with deionized water, and carrying out vacuum drying to obtain modified silicon micropowder;
c. putting the fluorosilicone rubber into a double-roll open mill, adding 20-30% by mass of white carbon black, 6-10% by mass of N, N' -m-phenylene bismaleimide and 12-18% by mass of modified silica fume into the double-roll open mill, mixing for 45-60min, discharging, standing at room temperature for 8-12h, and then carrying out remixing, simultaneously adding 0.8-1.5% by mass of a vulcanizing agent and 2.8-4.2% by mass of iridium trichloride into the open mill, and pressing out bubbles in the rubber material after remixing for 30-40 min; vulcanizing in a mold in a fixed volume manner, wherein the first-stage vulcanization temperature is 140 ℃, the vulcanization time is 15min, the second-stage vulcanization temperature is 160 ℃, and the vulcanization time is 7 min; and then cooling, demolding and standing for 2-3 days under natural conditions to obtain the modified fluorosilicone rubber finished product.
3. The abrasion-resistant silicone key according to claim 1, wherein: the matting powder is any one of superfine silicon dioxide, talcum powder and aluminum stearate.
4. The abrasion-resistant silicone key according to claim 1, wherein: the type of the micro-powder wax is any one of YL-902 and YL-903.
5. The abrasion-resistant silicone key according to claim 1, wherein: the stabilizing agent is epoxidized soybean oil.
6. The abrasion-resistant silicone key according to claim 1, wherein: the additive is any one of methyl phenyl methoxy silicone oil and ethoxy end-capped polymethylsilicone oil.
7. The abrasion-resistant silicone key according to claim 1, wherein: the vulcanizing agent is any one of epoxy resin or sulfur.
8. The abrasion-resistant silicone key according to claim 1, wherein: the filler is any one of quartz powder and nano zinc oxide.
9. The production process of the wear-resistant silica gel key according to any one of claims 1 to 8, characterized by comprising the following steps:
s1, feeding the raw materials except the vulcanizing agent into an internal mixer, mixing for 30-40min, discharging, and cooling to room temperature under natural conditions; then putting the cooled banburying rubber into an open mill, adding a vulcanizing agent, and mixing for 10-15min to obtain a rubber compound;
s2, putting the black conductive adhesive particles and the cut and weighed silica gel key raw materials on the male die of the vacuum vulcanizing machine, stuffing a color key into the female die, closing the die after preparation, and heating and pressurizing for vulcanization; after vulcanization, the molded key is taken out of the mold by matching with an air gun;
s3, putting the formed key into a vertical oven for secondary vulcanization, and obtaining a silica gel key main body after vulcanization; wherein, the temperature is set to be 190-210 ℃ during the secondary vulcanization, and the heating time is 2-3 h;
s4, spraying ink on the surface of the silica gel key main body according to the prior art, and laser engraving characters on the ink layer; and then spraying a layer of protective printing ink on the surface of the silica gel key body, vulcanizing and curing, and obtaining a wear-resistant silica gel key finished product after curing is finished.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040493.7A CN111154272A (en) | 2020-01-15 | 2020-01-15 | Wear-resistant silica gel key and production process thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010040493.7A CN111154272A (en) | 2020-01-15 | 2020-01-15 | Wear-resistant silica gel key and production process thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN111154272A true CN111154272A (en) | 2020-05-15 |
Family
ID=70562919
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202010040493.7A Withdrawn CN111154272A (en) | 2020-01-15 | 2020-01-15 | Wear-resistant silica gel key and production process thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN111154272A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849166A (en) * | 2020-05-29 | 2020-10-30 | 南京林名鑫电子有限公司 | Silicone rubber key and preparation method thereof |
-
2020
- 2020-01-15 CN CN202010040493.7A patent/CN111154272A/en not_active Withdrawn
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111849166A (en) * | 2020-05-29 | 2020-10-30 | 南京林名鑫电子有限公司 | Silicone rubber key and preparation method thereof |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN109456725B (en) | Environment-friendly silane modified polyether sealant for home decoration and preparation method thereof | |
| CN107641228B (en) | Use of organosilanes and rubber compositions and vulcanizates and process for their preparation | |
| CN106608990A (en) | Rubber composition and preparation method thereof, and vulcanized rubber | |
| CN110240746A (en) | A kind of anti-skidding heat-proof aging EVA, NR composite foam material and preparation method thereof | |
| CN111154272A (en) | Wear-resistant silica gel key and production process thereof | |
| CN113999531A (en) | Mold glue and preparation method thereof | |
| CN110845788B (en) | Durable elastic floating body and preparation method thereof | |
| CN111004434B (en) | High-wear-resistance anti-slip EVA (ethylene-vinyl acetate) composite foam material and preparation method thereof | |
| CN111117017A (en) | Rubber-plastic product without short-chain chlorinated paraffin and preparation method thereof | |
| CN107641219B (en) | Use of organosilanes and rubber compositions and vulcanizates and process for their preparation | |
| CN112210216B (en) | High-damping phenyl silicone rubber and preparation method and application thereof | |
| CN110396265B (en) | Rubber composition with self-healing function, vulcanized rubber, and preparation method and application thereof | |
| CN111690174B (en) | Silicon rubber for rubber covered roller containing modified white carbon black and preparation method thereof | |
| CN110862693B (en) | Bi-component liquid silicone rubber with ultralow compression set rate for foam | |
| CN116396626B (en) | Modified white carbon black and preparation method thereof | |
| CN111849166A (en) | Silicone rubber key and preparation method thereof | |
| CN115678128B (en) | Full explosion-proof tire inner side supporting adhesive and detection method | |
| CN113480853B (en) | Composite vulcanized silica gel gasket and preparation method thereof | |
| CN107880373B (en) | Antistatic shoe material and preparation method thereof | |
| CN112159595B (en) | Rubber head for pad printing of different types of hand surface plate glass and preparation method thereof | |
| CN109608721A (en) | A kind of preparation method of modified styrene butadiene rubber composite material | |
| CN108912429A (en) | A kind of ozone proof and corrosion resistant type rubber material and its preparation process | |
| CN112898705A (en) | Inner layer peroxide fluorine rubber material of rubber tube at high-temperature section of silicon-fluorine composite turbocharging system | |
| CN110982276A (en) | Silicone rubber vibration damping pad with low dynamic-static stiffness ratio and preparation method thereof | |
| CN109266016A (en) | A kind of key insulation silica gel and preparation method thereof |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| WW01 | Invention patent application withdrawn after publication | ||
| WW01 | Invention patent application withdrawn after publication |
Application publication date: 20200515 |