CN112109352A - Production process of medical high-performance caster - Google Patents
Production process of medical high-performance caster Download PDFInfo
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- CN112109352A CN112109352A CN202010913277.9A CN202010913277A CN112109352A CN 112109352 A CN112109352 A CN 112109352A CN 202010913277 A CN202010913277 A CN 202010913277A CN 112109352 A CN112109352 A CN 112109352A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D99/00—Subject matter not provided for in other groups of this subclass
- B29D99/0032—Producing rolling bodies, e.g. rollers, wheels, pulleys or pinions
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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
- C08L11/00—Compositions of homopolymers or copolymers of chloroprene
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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
- C08L23/00—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers
- C08L23/02—Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers not modified by chemical after-treatment
- C08L23/16—Elastomeric ethene-propene or ethene-propene-diene copolymers, e.g. EPR and EPDM rubbers
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- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
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- 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
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/20—Oxides; Hydroxides
- C08K3/22—Oxides; Hydroxides of metals
- C08K2003/2296—Oxides; Hydroxides of metals of zinc
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K3/00—Use of inorganic substances as compounding ingredients
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- C08K2003/382—Boron-containing compounds and nitrogen
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- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
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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
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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
- C08L2205/03—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
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Abstract
The invention discloses a production process of a medical high-performance caster, which comprises the following steps: s1: preparing raw materials: 60-70 parts of methyl vinyl silicone rubber, 20-30 parts of ethylene propylene diene monomer, 25-30 parts of fluorosilicone rubber, 6-8 parts of hydroxyl-terminated polydimethylsiloxane, 0.7-0.9 part of silane coupling agent, 0.12-0.15 part of toluene diisocyanate, 5-8 parts of linoleic acid, 3-5 parts of white carbon black, 2-3 parts of fumed silica, 1.5-1.8 parts of zinc oxide, 2.5-4.5 parts of anti-aging agent, 2-4 parts of heat stabilizer and 2-4 parts of cross-linking agent; s2: mixing; s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length; s4: sending the cut semi-finished product into an oven at 80-85 ℃ for preheating; then placing the preheated semi-finished product of the cutting section into a vulcanization mold, and vulcanizing for 4-8min at the pressure of 160-; s5: cooling after vulcanization to obtain a semi-finished product of the caster; s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain the finished caster wheel.
Description
Technical Field
The invention belongs to the technical field of rubber part processing, and particularly relates to a production process of a medical high-performance caster.
Background
The medical caster is a special caster which is suitable for the characteristics of light operation, flexible steering, large elasticity, special ultra-silence, wear resistance, winding prevention, chemical corrosion resistance and the like required by hospitals. Mainly comprises light casters (a chrome-plated support circular inserted bar caster, a chrome-plated support hollow rivet caster, a chrome-plated support screw rod caster and a chrome-plated support bottom plate caster) and metal support casters (screw rod type, hollow rivet type, inserted bar type and bottom plate type); all-plastic support casters (movable/fixed type, screw rod stainless steel type, insertion rod type, bottom plate type); medical double-wheel caster wheels (economic screw rod type, movable/fixed type and inserted rod type), central control caster wheels and medical bag cover folding brake caster wheels can meet various medical environmental requirements in all directions.
The traditional caster is made of common rubber, so that the traditional caster has poor aging resistance, the service life of the traditional caster is shortened, and the caster is easy to age, harden and crack after being used for a period of time, so that the caster cannot be used; in addition, the conventional caster needs to rub against the ground, and in order to improve the durability of the caster, the hardness of the surface needs to be increased, but after the hardness is increased, the vibration absorption capability of the caster is deteriorated during the moving process of the medical vehicle, and the moving noise is increased; however, if the caster is soft, the friction between the caster and the ground can be improved, so that the grip performance of the caster is improved, the shock absorption capacity of the caster is improved, the caster is not wear-resistant, the caster is difficult to use for a long time, and the service life of the caster is greatly reduced.
Disclosure of Invention
The invention aims to provide a production process of a medical high-performance caster, which aims to solve the technical problems in the background art.
In order to solve the technical problem, the invention aims to realize that:
a production process of a medical high-performance caster comprises the following steps:
s1: preparing raw materials: 60-70 parts of methyl vinyl silicone rubber, 20-30 parts of ethylene propylene diene monomer, 25-30 parts of fluorosilicone rubber, 6-8 parts of hydroxyl-terminated polydimethylsiloxane, 0.7-0.9 part of silane coupling agent, 0.12-0.15 part of toluene diisocyanate, 5-8 parts of linoleic acid, 3-5 parts of white carbon black, 2-3 parts of fumed silica, 1.5-1.8 parts of zinc oxide, 2.5-4.5 parts of anti-aging agent, 2-4 parts of heat stabilizer and 2-4 parts of cross-linking agent;
s2: mixing: carrying out high-speed mixing on methyl vinyl silicone rubber, ethylene propylene diene monomer rubber and fluorosilicone rubber at the temperature of 115-125 ℃ for 3-5min, then transferring the mixture into an environment of 10-20 ℃ for cooling treatment for 3-5h to obtain mixed silicone rubber, feeding the mixed silicone rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent, linoleic acid and a heat stabilizer, and mixing for 10-15 min at the temperature of 100-105 ℃; then continuously mixing for 8-12 min at the temperature of 115-120 ℃; then cooling to the temperature of 105-108 ℃, adding toluene diisocyanate and a cross-linking agent, continuously mixing for 7-10 min, and then mixing at a high speed of 140-155 ℃ for 6-8 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length;
s4: sending the cut semi-finished product into an oven at 80-85 ℃ for preheating; then placing the preheated semi-finished product of the cutting section into a vulcanization mold, and vulcanizing for 4-8min at the pressure of 160-;
s5: cooling after vulcanization to obtain a semi-finished product of the caster;
s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain a finished caster wheel.
On the basis of the above scheme and as a preferable scheme of the scheme: the production steps of the coating layer are as follows:
a: preparing raw materials, namely preparing 30-40 parts of chloroprene rubber, 30-40 parts of ethylene propylene diene monomer, 8-14 parts of silicon micropowder, 3-5 parts of boron nitride, 15-20 parts of nitrile rubber, 6-10 parts of nano graphene, 2-3 parts of talcum powder, 1-2 parts of cyclohexanone oxime, 5-8 parts of linoleic acid, 10-15 parts of a composite stabilizer, 5-10 parts of a cross-linking agent, 6-8 parts of hydroxyl-terminated polydimethylsiloxane and 0.7-0.9 part of a silane coupling agent;
b: mixing, namely mixing chloroprene rubber, ethylene propylene diene monomer rubber, silica powder, boron nitride, nitrile rubber, nano graphene, talcum powder, cyclohexanone oxime, linoleic acid and a composite stabilizer, feeding the mixed rubber into an internal mixer, adding a cross-linking agent, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, continuously mixing for 7-10 min, and then mixing at a high speed of 140-155 ℃ for 6-8 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
c: obtaining a semi-finished product of the coating layer.
On the basis of the above scheme and as a preferable scheme of the scheme: coating the obtained semi-finished product of the coating layer on the surface of the semi-finished product of the caster wheel, and sending the semi-finished product of the coating layer into an oven at 80-85 ℃ for preheating; preheating, placing into a vulcanization mold, and vulcanizing at the pressure of 160-180kgf/cm2 and the temperature of 170-180 ℃ for 5-10 min; after cooling, a finished caster is obtained.
On the basis of the above scheme and as a preferable scheme of the scheme: the fluorosilicone rubber is FVMQ fluorosilicone rubber.
On the basis of the above scheme and as a preferable scheme of the scheme: the silane coupling agent is KH 570.
On the basis of the above scheme and as a preferable scheme of the scheme: the cross-linking agent is a mixture of sulfur and zinc methacrylate.
On the basis of the above scheme and as a preferable scheme of the scheme: the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the sulfur to the zinc methacrylate is 1: 0.3 to 0.37.
On the basis of the above scheme and as a preferable scheme of the scheme: the anti-aging agent is an anti-aging agent 4010.
On the basis of the above scheme and as a preferable scheme of the scheme: the heat stabilizer is stearic acid, and the zinc oxide is nano zinc oxide.
Compared with the prior art, the invention has the outstanding and beneficial technical effects that: compared with the traditional caster, the caster produced by the method has excellent aging resistance, is not easy to age and harden and crack, and can keep the flexibility and elasticity of the caster for a long time; the utility model provides a required function of making an uproar of falling of shaking has been compromise simultaneously to the truckle, still compromises the wear-resisting durable characteristic of truckle wheel face simultaneously.
Detailed Description
To make the objects, technical solutions and advantages of the present application clearer, the technical solutions will be clearly and completely described below with reference to the embodiments,
example one
A production process of an aging-resistant window wiper comprises the following steps:
s1: preparing raw materials: 60 parts of methyl vinyl silicone rubber, 20 parts of ethylene propylene diene monomer, 25 parts of fluorosilicone rubber, 6 parts of hydroxyl-terminated polydimethylsiloxane, 0.7 part of silane coupling agent, 0.12 part of toluene diisocyanate, 5 parts of linoleic acid, 3 parts of white carbon black, 2 parts of fumed silica, 1.5 parts of zinc oxide, 2.5 parts of anti-aging agent, 2 parts of heat stabilizer and 2 parts of crosslinking agent;
s2: mixing: carrying out high-speed mixing on methyl vinyl silicone rubber, ethylene propylene diene monomer rubber and fluorosilicone rubber at the temperature of 115 ℃ for 3min, then transferring the mixture into a 10 ℃ environment for cooling treatment for 3h to obtain mixed silicone rubber, feeding the mixed silicone rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, linoleic acid, zinc oxide, an anti-aging agent and a heat stabilizer, and mixing for 10min at the temperature of 100 ℃; then continuously mixing for 8min at the temperature of 115 ℃; then cooling to 105 ℃, adding toluene diisocyanate and a cross-linking agent, continuing to mix for 7min, and then mixing at a high speed for 6min at 140 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length;
s4: sending the extruded semi-finished product into an oven at 80 ℃ for preheating; placing the preheated semi-finished product extruded into strips into a vulcanization mold, and vulcanizing for 4min at the temperature of 170 ℃ and the pressure of 160kgf/cm 2;
s5: cooling after vulcanization to obtain a semi-finished product of the caster;
s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain a finished caster wheel.
The production steps of the coating layer are as follows:
a: preparing raw materials, namely preparing 30 parts of chloroprene rubber, 30 parts of ethylene propylene diene monomer, 8 parts of silicon micropowder, 3 parts of boron nitride, 15 parts of nitrile rubber, 6 parts of nano graphene, 2 parts of talcum powder, 1 part of cyclohexanone oxime, 5 parts of linoleic acid, 10 parts of a composite stabilizer, 5 parts of a cross-linking agent, 6 parts of hydroxyl-terminated polydimethylsiloxane and 0.7 part of a silane coupling agent;
b: mixing, namely mixing chloroprene rubber, ethylene propylene diene monomer rubber, silicon micropowder, boron nitride, nitrile rubber, nano graphene, talcum powder, cyclohexanone oxime, linoleic acid and a composite stabilizer, feeding the mixed rubber into an internal mixer, adding a cross-linking agent, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, continuously mixing for 7min, and then mixing at a high speed for 6min at the temperature of 140 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
c: obtaining a semi-finished product of the coating layer.
Coating the obtained semi-finished product of the coating layer on the surface of the semi-finished product of the window wiper, and sending the semi-finished product of the coating layer into an oven at 80 ℃ for preheating; preheating, placing into a vulcanization mold, and vulcanizing at 170 deg.C and 160kgf/cm2 for 5 min; and cooling to obtain the finished window wiper product.
In the present embodiment, the fluorosilicone rubber is further preferably FVMQ fluorosilicone rubber.
In the present embodiment, the silane coupling agent is further preferably KH 570.
In a further preferred embodiment, the crosslinking agent is a mixture of sulfur and zinc methacrylate.
In this embodiment, it is further preferable that the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of sulfur to zinc methacrylate is 1: 0.3 to 0.37.
In this embodiment, the antioxidant is preferably an antioxidant 4010.
In a further preferred embodiment of the present invention, the heat stabilizer is stearic acid, and the zinc oxide is nano zinc oxide.
Compared with the traditional caster, the caster produced by the embodiment has excellent aging resistance, is not easy to age and harden and crack, and can keep flexibility and elasticity for a long time; the utility model provides a required function of making an uproar of falling of shaking has been compromise simultaneously to the truckle, still compromises the wear-resisting durable characteristic of truckle wheel face simultaneously.
Example two
A production process of an aging-resistant window wiper comprises the following steps:
s1: preparing raw materials: 65 parts of methyl vinyl silicone rubber, 25 parts of ethylene propylene diene monomer, 27.5 parts of fluorosilicone rubber, 7 parts of hydroxyl-terminated polydimethylsiloxane, 0.8 part of silane coupling agent, 0.13 part of toluene diisocyanate, 6.5 parts of linoleic acid, 4 parts of white carbon black, 2.5 parts of fumed silica, 1.65 parts of zinc oxide, 3.5 parts of anti-aging agent, 3 parts of heat stabilizer and 3 parts of crosslinking agent;
s2: mixing: carrying out high-speed mixing on methyl vinyl silicone rubber, ethylene propylene diene monomer rubber and fluorosilicone rubber at 120 ℃ for 4min, then transferring the mixture into an environment at 15 ℃ for cooling treatment for 4h to obtain mixed silicone rubber, feeding the mixed silicone rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent, linoleic acid and a heat stabilizer, and mixing for 12.5min at 102.5 ℃; then continuously mixing for 10min at the temperature of 117 ℃; then cooling to the temperature of 1.65 ℃, adding toluene diisocyanate and a cross-linking agent, continuing to mix for 8min, and then mixing at a high speed for 7min at the temperature of 150 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length;
s4: sending the extruded semi-finished product into an oven at 82 ℃ for preheating; placing the preheated semi-finished product extruded into strips into a vulcanization mold, and vulcanizing at the pressure of 170kgf/cm2 and the temperature of 175 ℃ for 6 min;
s5: cooling after vulcanization to obtain a semi-finished product of the caster;
s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain a finished caster wheel.
The production steps of the coating layer are as follows:
a: preparing raw materials, namely preparing 35 parts of chloroprene rubber, 35 parts of ethylene propylene diene monomer, 11 parts of silicon micropowder, 4 parts of boron nitride, 17 parts of nitrile rubber, 8 parts of nano graphene, 2.5 parts of talcum powder, 1.5 parts of cyclohexanone oxime, 6.5 parts of linoleic acid, 12.5 parts of a composite stabilizer, 7 parts of a cross-linking agent, 7 parts of hydroxyl-terminated polydimethylsiloxane and 0.8 part of a silane coupling agent;
b: mixing, namely mixing chloroprene rubber, ethylene propylene diene monomer rubber, silicon micropowder, boron nitride, nitrile rubber, nano graphene, talcum powder, cyclohexanone oxime, linoleic acid and a composite stabilizer, feeding the mixed rubber into an internal mixer, adding a cross-linking agent, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, continuously mixing for 8min, and then mixing at a high speed for 7min at the temperature of 147 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
c: obtaining a semi-finished product of the coating layer.
Coating the obtained semi-finished product of the coating layer on the surface of the semi-finished product of the window wiper, and sending the semi-finished product of the coating layer into an oven at 82 ℃ for preheating; preheating, placing into a vulcanization mold, and vulcanizing at a pressure of 170kgf/cm2 and a temperature of 175 deg.C for 7 min; and cooling to obtain the finished window wiper product.
In the present embodiment, the fluorosilicone rubber is further preferably FVMQ fluorosilicone rubber.
In the present embodiment, the silane coupling agent is further preferably KH 570.
In a further preferred embodiment, the crosslinking agent is a mixture of sulfur and zinc methacrylate.
In this embodiment, it is further preferable that the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of sulfur to zinc methacrylate is 1: 0.3 to 0.37.
In this embodiment, the antioxidant is preferably an antioxidant 4010.
In a further preferred embodiment of the present invention, the heat stabilizer is stearic acid, and the zinc oxide is nano zinc oxide.
Compared with the traditional caster, the caster produced by the embodiment has excellent aging resistance, is not easy to age and harden and crack, and can keep flexibility and elasticity for a long time; the utility model provides a required function of making an uproar of falling of shaking has been compromise simultaneously to the truckle, still compromises the wear-resisting durable characteristic of truckle wheel face simultaneously.
EXAMPLE III
A production process of an aging-resistant window wiper comprises the following steps:
s1: preparing raw materials: 70 parts of methyl vinyl silicone rubber, 30 parts of ethylene propylene diene monomer, 30 parts of fluorosilicone rubber, 8 parts of hydroxyl-terminated polydimethylsiloxane, 0.9 part of silane coupling agent, 0.15 part of toluene diisocyanate, 8 parts of linoleic acid, 5 parts of white carbon black, 3 parts of fumed silica, 1.8 parts of zinc oxide, 4.5 parts of anti-aging agent, 4 parts of heat stabilizer and 4 parts of cross-linking agent;
s2: mixing: carrying out high-speed mixing on methyl vinyl silicone rubber, ethylene propylene diene monomer rubber and fluorosilicone rubber at 125 ℃ for 5min, then transferring the mixture into an environment of 20 ℃ for cooling treatment for 5h to obtain mixed silicone rubber, feeding the mixed silicone rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent, linoleic acid and a heat stabilizer, and mixing for 15min at 105 ℃; then continuously mixing for 12min at the temperature of 120 ℃; then cooling to 108 ℃, adding toluene diisocyanate and a cross-linking agent, continuing to mix for 10min, and then mixing at a high speed for 8min at a temperature of 155 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length;
s4: sending the extruded semi-finished product into an oven at 85 ℃ for preheating; placing the preheated semi-finished product extruded into strips into a vulcanization mold, and vulcanizing at 180 ℃ for 8min under the pressure of 180kgf/cm 2;
s5: cooling after vulcanization to obtain a semi-finished product of the caster;
s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain a finished caster wheel.
The production steps of the coating layer are as follows:
a: preparing raw materials, namely preparing 40 parts of chloroprene rubber, 40 parts of ethylene propylene diene monomer, 14 parts of silicon micropowder, 5 parts of boron nitride, 20 parts of nitrile rubber, 10 parts of nano graphene, 3 parts of talcum powder, 2 parts of cyclohexanone oxime, 8 parts of linoleic acid, 15 parts of a composite stabilizer, 10 parts of a cross-linking agent, 8 parts of hydroxyl-terminated polydimethylsiloxane and 0.9 part of a silane coupling agent;
b: mixing, namely mixing chloroprene rubber, ethylene propylene diene monomer rubber, silicon micropowder, boron nitride, nitrile rubber, nano graphene, talcum powder, cyclohexanone oxime, linoleic acid and a composite stabilizer, feeding the mixed rubber into an internal mixer, adding a cross-linking agent, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, continuously mixing for 10min, and then mixing at a high speed for 8min at a temperature of 155 ℃; then discharging rubber, turning over by an open mill, then discharging and cooling;
c: obtaining a semi-finished product of the coating layer.
Coating the obtained semi-finished product of the coating layer on the surface of the semi-finished product of the window wiper, and sending the semi-finished product of the coating layer into an oven at 85 ℃ for preheating; preheating, placing into a vulcanization mold, and vulcanizing at 180 deg.C under 180kgf/cm2 for 10 min; and cooling to obtain the finished window wiper product.
In the present embodiment, the fluorosilicone rubber is further preferably FVMQ fluorosilicone rubber.
In the present embodiment, the silane coupling agent is further preferably KH 570.
In a further preferred embodiment, the crosslinking agent is a mixture of sulfur and zinc methacrylate.
In this embodiment, it is further preferable that the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of sulfur to zinc methacrylate is 1: 0.3 to 0.37.
In this embodiment, the antioxidant is preferably an antioxidant 4010.
In a further preferred embodiment of the present invention, the heat stabilizer is stearic acid, and the zinc oxide is nano zinc oxide.
Compared with the traditional caster, the caster produced by the embodiment has excellent aging resistance, is not easy to age and harden and crack, and can keep flexibility and elasticity for a long time; the utility model provides a required function of making an uproar of falling of shaking has been compromise simultaneously to the truckle, still compromises the wear-resisting durable characteristic of truckle wheel face simultaneously.
The following tests were performed on the casters obtained in the first to third examples of the present invention and the conventional caster (see the test standard HG/T2579-94), and the test results are shown in table 1:
TABLE 1
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, so: all equivalent changes made according to the structure, shape and principle of the invention are covered by the protection scope of the invention.
Claims (9)
1. A production process of a medical high-performance caster wheel is characterized by comprising the following steps: the method comprises the following steps:
s1: preparing raw materials: 60-70 parts of methyl vinyl silicone rubber, 20-30 parts of ethylene propylene diene monomer, 25-30 parts of fluorosilicone rubber, 6-8 parts of hydroxyl-terminated polydimethylsiloxane, 0.7-0.9 part of silane coupling agent, 0.12-0.15 part of toluene diisocyanate, 5-8 parts of linoleic acid, 3-5 parts of white carbon black, 2-3 parts of fumed silica, 1.5-1.8 parts of zinc oxide, 2.5-4.5 parts of anti-aging agent, 2-4 parts of heat stabilizer and 2-4 parts of cross-linking agent;
s2: mixing: carrying out high-speed mixing on methyl vinyl silicone rubber, ethylene propylene diene monomer rubber and fluorosilicone rubber at the temperature of 115-125 ℃ for 3-5min, then transferring the mixture into an environment of 10-20 ℃ for cooling treatment for 3-5h to obtain mixed silicone rubber, feeding the mixed silicone rubber into an internal mixer, adding hydroxyl-terminated polydimethylsiloxane, a silane coupling agent, white carbon black, fumed silica, zinc oxide, an anti-aging agent, linoleic acid and a heat stabilizer, and mixing for 10-15 min at the temperature of 100-105 ℃; then continuously mixing for 8-12 min at the temperature of 115-120 ℃; then cooling to the temperature of 105-108 ℃, adding toluene diisocyanate and a cross-linking agent, continuously mixing for 7-10 min, and then mixing at a high speed of 140-155 ℃ for 6-8 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
s3: extruding the rubber material mixed in the step S2 into a column shape through a screw extruder, and cutting the column shape into sections with fixed length;
s4: sending the cut semi-finished product into an oven at 80-85 ℃ for preheating; then placing the preheated semi-finished product of the cutting section into a vulcanization mold, and vulcanizing for 4-8min at the pressure of 160-;
s5: cooling after vulcanization to obtain a semi-finished product of the caster;
s6: and coating a coating layer on the surface of the semi-finished caster wheel to obtain a finished caster wheel.
2. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the production steps of the coating layer are as follows:
a: preparing raw materials, namely preparing 30-40 parts of chloroprene rubber, 30-40 parts of ethylene propylene diene monomer, 8-14 parts of silicon micropowder, 3-5 parts of boron nitride, 15-20 parts of nitrile rubber, 6-10 parts of nano graphene, 2-3 parts of talcum powder, 1-2 parts of cyclohexanone oxime, 5-8 parts of linoleic acid, 10-15 parts of a composite stabilizer, 5-10 parts of a cross-linking agent, 6-8 parts of hydroxyl-terminated polydimethylsiloxane and 0.7-0.9 part of a silane coupling agent;
b: mixing, namely mixing chloroprene rubber, ethylene propylene diene monomer rubber, silica powder, boron nitride, nitrile rubber, nano graphene, talcum powder, cyclohexanone oxime, linoleic acid and a composite stabilizer, feeding the mixed rubber into an internal mixer, adding a cross-linking agent, hydroxyl-terminated polydimethylsiloxane and a silane coupling agent, continuously mixing for 7-10 min, and then mixing at a high speed of 140-155 ℃ for 6-8 min; then discharging rubber, turning over by an open mill, then discharging and cooling;
c: obtaining a semi-finished product of the coating layer.
3. The production process of the medical high-performance caster according to claim 2, wherein: coating the obtained semi-finished product of the coating layer on the surface of the semi-finished product of the caster wheel, and sending the semi-finished product of the coating layer into an oven at 80-85 ℃ for preheating; preheating, placing into a vulcanization mold, and vulcanizing at the pressure of 160-180kgf/cm2 and the temperature of 170-180 ℃ for 5-10 min; after cooling, a finished caster is obtained.
4. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the fluorosilicone rubber is FVMQ fluorosilicone rubber.
5. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the silane coupling agent is KH 570.
6. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the cross-linking agent is a mixture of sulfur and zinc methacrylate.
7. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the cross-linking agent is a mixture of sulfur and zinc methacrylate, and the mass ratio of the sulfur to the zinc methacrylate is 1: 0.3 to 0.37.
8. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the anti-aging agent is an anti-aging agent 4010.
9. The production process of the medical high-performance caster according to claim 1, wherein the production process comprises the following steps: the heat stabilizer is stearic acid, and the zinc oxide is nano zinc oxide.
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