CN108395588A - The strong forging press cushion pad and preparation method thereof of wear-resistant antibacterial ability - Google Patents
The strong forging press cushion pad and preparation method thereof of wear-resistant antibacterial ability Download PDFInfo
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- CN108395588A CN108395588A CN201810046094.4A CN201810046094A CN108395588A CN 108395588 A CN108395588 A CN 108395588A CN 201810046094 A CN201810046094 A CN 201810046094A CN 108395588 A CN108395588 A CN 108395588A
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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
- C08L9/00—Compositions of homopolymers or copolymers of conjugated diene hydrocarbons
- C08L9/02—Copolymers with acrylonitrile
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- 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
- 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
- C08K2003/2206—Oxides; Hydroxides of metals of calcium, strontium or barium
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- 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
- 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
- C08K2003/2227—Oxides; Hydroxides of metals of aluminium
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/18—Oxygen-containing compounds, e.g. metal carbonyls
- C08K3/24—Acids; Salts thereof
- C08K3/26—Carbonates; Bicarbonates
- C08K2003/265—Calcium, strontium or barium carbonate
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- 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
- C08K3/00—Use of inorganic substances as compounding ingredients
- C08K3/30—Sulfur-, selenium- or tellurium-containing compounds
- C08K2003/3045—Sulfates
- C08K2003/3063—Magnesium sulfate
-
- 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
- C08K2201/011—Nanostructured additives
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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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Tires In General (AREA)
- Compositions Of Macromolecular Compounds (AREA)
Abstract
The present invention relates to technical field of rubber material, and in particular to a kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：Nitrile rubber, natural rubber, ethylene propylene diene rubber, chitosan, probenazole, polyethylene glycol, methyl hydantoin compound, Peracetic acid, magnesium sulfate, calcium carbonate, sulphur, graphite, silica, calcium oxide, carbon black, boron carbide, nano aluminium oxide, rubber activator, thickener, rubber accelerator and anti-aging agent；The present invention is using nitrile rubber, natural rubber, ethylene propylene diene rubber, chitosan, probenazole, polyethylene glycol, methyl hydantoin compound and Peracetic acid as the raw material for preparing cushion pad, prepared cushion pad not only has cushion performance good, and antibiotic property improves, graphite, silica, calcium oxide, boron carbide, rubber activator, thickener, rubber accelerator and anti-aging agent make cushion pad that there is good wear-resisting property, service life to be extended.
Description
Technical field
The present invention relates to technical field of rubber material, and in particular to a kind of forging press cushion pad that wear-resistant antibacterial ability is strong
And preparation method thereof.
Background technology
Present many mechanical equipments are required for cushion pad, and cushion pad aged deterioration can influence the use of equipment, and tradition is slow
Punching pad have been unable to meet the market demand, the utilization rate in mechanical equipment of cushion pad is higher and higher, cushion pad with natural rubber with
Various synthetic rubber are primary raw material, add various auxiliary agents and filler material, through plasticating, being kneaded, compression moulding.Existing cushion pad
Cushion performance, resistance to ag(e)ing and tear resistance, adaptive deformation ability is strong, water resistance is good.Cushion pad frequency of use is high, wear-resisting
Poor performance, by bacterium infection, causes whole performance low and service life is reduced with easy.
Forging press cushion pad, how made of rubber, the type of rubber is relatively more, comparatively the quality of natural rubber can
Relatively good, because its shaping speed is than very fast, and the buffering effect that it is played is also extraordinary, but traditional natural
Cushion pad there is noises during use it is big, perishable the shortcomings of, the cushion pad on hot press is generally also to use
The material of rubber makes, cushion pad cushion performance, resistance to ag(e)ing and tear resistance, and adaptive deformation ability is strong, water proofing property
Can be good, but wear-resisting property difference and antibacterial ability are poor.
Although there is currently marketed cushion pad certain pressure buffer effect, the effect of its ageing resistance to need to be changed
It is kind, it is more than in this way, existing cushion pad there is also the poor disadvantages of antibiotic property and wearability.
Invention content
In view of the deficiencies of the prior art, the present invention provides a kind of forging press cushion pad that wear-resistant antibacterial ability is strong and its
Preparation method not only has the advantages that resiliency is good, also has the advantages that wearability is good and strong antibacterial.
In order to achieve the above object, the present invention is achieved by the following technical programs：
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：50-58 parts of nitrile rubber,
6-10 parts of natural rubber, 8-12 parts of ethylene propylene diene rubber, 6-8 parts of chitosan, 0.1-1 parts of probenazole, 1-3 parts of polyethylene glycol, first
0.3-2 parts of base hydantoin compound, 2-5 parts of Peracetic acid, magnesium sulfate, 3-8 parts of calcium carbonate, 3-8 parts of sulphur, calcium carbonate 3-8
Part, 12-20 parts of graphite, 5-12 parts of silica, 1-4 parts of calcium oxide, 3-10 parts of carbon black, 3-7 parts of boron carbide, nano aluminium oxide 2-
1-3 parts of 6 parts, 2-5 parts of rubber activator, 2-6 parts of thickener, 5-12 parts of rubber accelerator and anti-aging agent.
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, preparation method includes the following steps：
A, nitrile rubber, natural rubber, ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially added thereto
Rubber activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, in 130-180 DEG C of item
Mixing 35-50min is carried out under part, then heats to 195-210 DEG C of mixing 85-120min, after mixing, material is taken out,
Molten rubber is obtained, it is spare；
B, molten rubber is transferred in reaction kettle, and sequentially add into reaction kettle except nano aluminium oxide, silica and
The remaining material of thickener carries out heating in vacuum, is warming up to 75-90 DEG C, is stirred to react 135-170min, is then cooled to 50-
65 DEG C, obtain blending ingredients A；；
C, blending ingredients A is transferred in blender, nano aluminium oxide, silica and thickener is then added thereto,
And 10-18min is stirred under conditions of 190-210 DEG C, obtain blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 75-95min；
Preferably, the thickener selects polyacrylamide.
Preferably, the accelerating agent selects triethanolamine.
Preferably, the rubber softener selects hexamethylene oil.
Preferably, the anti-aging agent selects antioxidant 4020 and antioxidant 4010.
Advantageous effect：
The present invention is with nitrile rubber, natural rubber, ethylene propylene diene rubber, chitosan, probenazole, polyethylene glycol, methyl second
As the raw material for preparing cushion pad, prepared cushion pad not only has cushion performance for interior sulfonylurea compound and Peracetic acid
It is good, but also have the advantages that anti-microbial property is excellent.Magnesium sulfate, calcium carbonate and sulphur mutual cooperation make cushion pad improve desulfuration speed
Degree, shortens the time of the vulcanization of rubber.Graphite, silica, calcium oxide, carbon black and boron carbide mutual cooperation make cushion pad have
Good wear-resisting property.Nano aluminium oxide, rubber activator, thickener, rubber accelerator and anti-aging agent so that institute of the present invention
The cushion pad of preparation is with tensile strength is good, tear resistance is excellent and wear-resisting property is excellent.Simultaneously decrease hexamethylene oil dosage,
The input for having saved cost, reduces frequency of maintenance and maintenance cost at the service life for extending cushion pad.
Specific implementation mode
In order to make the object, technical scheme and advantages of the embodiment of the invention clearer, below in conjunction with the embodiment of the present invention,
Technical scheme in the embodiment of the invention is clearly and completely described, it is clear that described embodiment is the present invention one
Divide embodiment, instead of all the embodiments.Based on the embodiments of the present invention, those of ordinary skill in the art are not making
The every other embodiment obtained under the premise of creative work, shall fall within the protection scope of the present invention.
Embodiment 1：
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：It is 50 parts of nitrile rubber, natural
6 parts of rubber, 8 parts of ethylene propylene diene rubber, 6 parts of chitosan, 0.1 part of probenazole, 1 part of polyethylene glycol, methyl hydantoin compound
0.3 part, 2 parts of Peracetic acid, 3 parts of magnesium sulfate, 3 parts of calcium carbonate, 3 parts of sulphur, 12 parts of graphite, 5 parts of silica, 1 part of calcium oxide,
3 parts of carbon black, 3 parts of boron carbide, 2 parts of nano aluminium oxide, 2 parts of rubber activator, 2 parts of thickener, 5 parts of rubber accelerator and anti-aging agent
1 part.
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, preparation method includes the following steps：
A, nitrile rubber, natural rubber, ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially added thereto
Rubber activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, under conditions of 130 DEG C
Mixing 35min is carried out, 195 DEG C of mixing 85min is then heated to, after mixing, material is taken out, obtain molten rubber, it is standby
With；
B, molten rubber is transferred in reaction kettle, and sequentially add into reaction kettle except nano aluminium oxide, silica and
The remaining material of thickener carries out heating in vacuum, is warming up to 75 DEG C, is stirred to react 135min, be then cooled to 50 DEG C, mixed
It is combined a point A；
C, blending ingredients A is transferred in blender, nano aluminium oxide, silica and thickener is then added thereto,
And 10min is stirred under conditions of at 190 DEG C, obtain blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 75min.
After tested, it is 76H, tearing strength 42.3kN/m, volume by cushion pad shore hardness prepared by embodiment 1
Expansion rate is 101.3%, and wearability performance improves 35%, and the surfaces 72h bacterium is stood in the environment of 60 degree of relative humidity are 60%
Fall number (cfu/cm2) it is 3.
Embodiment 2：
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：It is 52 parts of nitrile rubber, natural
8 parts of rubber, 9 parts of ethylene propylene diene rubber, 6.5 parts of chitosan, 0.5 part of probenazole, 1.5 parts of polyethylene glycol, methyl hydantoin
Close 0.8 part of object, 3 parts of Peracetic acid, 4 parts of magnesium sulfate, 4 parts of calcium carbonate, 4 parts of sulphur, 14 parts of graphite, 7 parts of silica, calcium oxide
2 parts, 4.5 parts of carbon black, 4 parts of boron carbide, 3 parts of nano aluminium oxide, 3 parts of rubber activator, 3 parts of thickener, 6 parts of rubber accelerator and
1.5 parts of anti-aging agent.
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, preparation method includes the following steps：
A, nitrile rubber, natural rubber, ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially added thereto
Rubber activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, in 130-180 DEG C of item
Mixing 40min is carried out under part, 200 DEG C of mixing 95min is then heated to, after mixing, material is taken out, and obtains melting rubber
Glue, it is spare；
B, molten rubber is transferred in reaction kettle, and sequentially add into reaction kettle except nano aluminium oxide, silica and
The remaining material of thickener carries out heating in vacuum, is warming up to 85 DEG C, is stirred to react 145min, be then cooled to 55 DEG C, mixed
It is combined a point A；
C, blending ingredients A is transferred in blender, nano aluminium oxide, silica and thickener is then added thereto,
And 12min is stirred under conditions of at 195 DEG C, obtain blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 80min.
After tested, the cushion pad shore hardness prepared by embodiment 2 is 78H, tearing strength 42.4kN/m, and volume is swollen
Swollen rate is 101.4%, and wearability performance improves 38%, and 72h surface colonies are stood in the environment of 60 degree of relative humidity are 60%
Number (cfu/cm2) it is 4.
Embodiment 3：
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：It is 55 parts of nitrile rubber, natural
9 parts of rubber, 10 parts of ethylene propylene diene rubber, 7 parts of chitosan, 0.6 part of probenazole, 2 parts of polyethylene glycol, methyl hydantoin compound
1.3 parts, 4 parts of Peracetic acid, 6.5 parts of magnesium sulfate, 6.5 parts of calcium carbonate, 6.5 parts of sulphur, 17 parts of graphite, 0 part of silica 1, oxygen
Change 3 parts of calcium, 8 parts of carbon black, 6 parts of boron carbide, 5 parts of nano aluminium oxide, 4.5 parts of rubber activator, 5 parts of thickener, rubber accelerator 9
2.5 parts of part and anti-aging agent.
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, preparation method includes the following steps：
A, nitrile rubber, natural rubber, ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially added thereto
Rubber activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, under conditions of 160 DEG C
Mixing 45min is carried out, 206 DEG C of mixing 110min is then heated to, after mixing, material is taken out, obtain molten rubber, it is standby
With；
B, molten rubber is transferred in reaction kettle, and sequentially add into reaction kettle except nano aluminium oxide, silica and
The remaining material of thickener carries out heating in vacuum, is warming up to 83 DEG C, is stirred to react 160min, be then cooled to 60 DEG C, mixed
It is combined a point A；
C, blending ingredients A is transferred in blender, nano aluminium oxide, silica and thickener is then added thereto,
And 16min is stirred under conditions of at 200 DEG C, obtain blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 85min.
After tested, the cushion pad shore hardness prepared by embodiment 3 is 79H, tearing strength 42.3kN/m, and volume is swollen
Swollen rate is 101.5%, and wearability performance improves 41%, and 72h surface colonies are stood in the environment of 60 degree of relative humidity are 60%
Number (cfu/cm2) it is 4.
Embodiment 4：
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, ingredient is by weight：It is 58 parts of nitrile rubber, natural
10 parts of rubber, 12 parts of ethylene propylene diene rubber, 8 parts of chitosan, 1 part of probenazole, 3 parts of polyethylene glycol, methyl hydantoin compound 2
Part, 5 parts of Peracetic acid, 8 parts of magnesium sulfate, 8 parts of calcium carbonate, 8 parts of sulphur, 20 parts of graphite, 2 parts of silica 1,4 parts of calcium oxide, charcoal
Black 10 parts, 7 parts of boron carbide, 6 parts of nano aluminium oxide, 5 parts of rubber activator, 6 parts of thickener, 12 parts of rubber accelerator and anti-aging agent
3 parts.
A kind of forging press cushion pad that wear-resistant antibacterial ability is strong, preparation method includes the following steps：
A, nitrile rubber, natural rubber, ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially added thereto
Rubber activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, under conditions of 180 DEG C
Mixing 50min is carried out, 210 DEG C of mixing 120min is then heated to, after mixing, material is taken out, obtain molten rubber, it is standby
With；
B, molten rubber is transferred in reaction kettle, and sequentially add into reaction kettle except nano aluminium oxide, silica and
The remaining material of thickener carries out heating in vacuum, is warming up to 90 DEG C, is stirred to react 170min, be then cooled to 65 DEG C, mixed
It is combined a point A；
C, blending ingredients A is transferred in blender, nano aluminium oxide, silica and thickener is then added thereto,
And 18min is stirred under conditions of at 210 DEG C, obtain blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 95min.
After tested, the cushion pad shore hardness prepared by embodiment 4 is 80H, tearing strength 42.9kN/m, and volume is swollen
Swollen rate is 101.5%, and wearability performance improves 46%, and 72h surface colonies are stood in the environment of 60 degree of relative humidity are 60%
Number (cfu/cm2) it is 3.
It should be noted that herein, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also include other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although with reference to the foregoing embodiments
Invention is explained in detail, it will be understood by those of ordinary skill in the art that：It still can be to aforementioned each implementation
Technical solution recorded in example is modified or equivalent replacement of some of the technical features；And these modification or
It replaces, the spirit and scope for various embodiments of the present invention technical solution that it does not separate the essence of the corresponding technical solution.
Claims (6)
1. a kind of forging press cushion pad that wear-resistant antibacterial ability is strong, which is characterized in that its ingredient is by weight：Nitrile rubber
50-58 parts, 6-10 parts of natural rubber, 8-12 parts of ethylene propylene diene rubber, 6-8 parts of chitosan, 0.1-1 parts of probenazole, polyethylene glycol
1-3 parts, 0.3-2 parts of methyl hydantoin compound, 2-5 parts of Peracetic acid, 3-8 parts of magnesium sulfate, 3-8 parts of sulphur, calcium carbonate 3-8
Part, 12-20 parts of graphite, 5-12 parts of silica, 1-4 parts of calcium oxide, 3-10 parts of carbon black, 3-7 parts of boron carbide, nano aluminium oxide 2-
1-3 parts of 6 parts, 2-5 parts of rubber activator, 2-6 parts of thickener, 5-12 parts of rubber accelerator and anti-aging agent.
2. a kind of forging press cushion pad that wear-resistant antibacterial ability is strong according to claim 1, which is characterized in that it is prepared
Method includes the following steps：
A, nitrile rubber, natural rubber and ethylene propylene diene rubber silicon rubber are placed in mixer, and sequentially add rubber thereto
Glue activator, anti-aging agent, graphite, boron carbide, carbon black, sulphur, magnesium sulfate, calcium carbonate and accelerating agent, in 130-180 DEG C of condition
Lower progress mixing 35-50min, then heats to 195-210 DEG C of mixing 85-120min, takes out material after mixing, obtain
Molten rubber, it is spare；
B, molten rubber is transferred in reaction kettle, and into reaction kettle be added except nano aluminium oxide, silica and thickener with
Outer surplus stock carries out heating in vacuum, is warming up to 75-90 DEG C, is stirred to react 135-170min, is then cooled to 50-65 DEG C,
Obtain blending ingredients A；
C, blending ingredients A is transferred in blender, is then added nano aluminium oxide, silica and thickener thereto, and
10-18min is stirred under conditions of 190-210 DEG C, obtains blending ingredients B；
D, blending ingredients B is subjected to forming processes using mold, it is then cooling to get finished product stands solidification 75-95min.
3. according to a kind of forging press cushion pad that wear-resistant antibacterial ability is strong described in claim 1 is weighed, it is characterised in that：The increasing
Thick dose of selection polyacrylamide.
4. a kind of forging press cushion pad that wear-resistant antibacterial ability is strong according to claim 1, it is characterised in that：The promotion
Triethanolamine is selected in agent.
5. a kind of forging press cushion pad that wear-resistant antibacterial ability is strong according to claim 1, it is characterised in that：The rubber
Hexamethylene oil is selected in gum softening agent.
6. a kind of forging press cushion pad that wear-resistant antibacterial ability is strong according to claim 1, it is characterised in that：It is described anti-
Antioxidant 4020 and antioxidant 4010 are selected in old agent.
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| CN201810046094.4A CN108395588A (en) | 2018-01-17 | 2018-01-17 | The strong forging press cushion pad and preparation method thereof of wear-resistant antibacterial ability |
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| CN201810046094.4A CN108395588A (en) | 2018-01-17 | 2018-01-17 | The strong forging press cushion pad and preparation method thereof of wear-resistant antibacterial ability |
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| CN110669343A (en) * | 2019-10-24 | 2020-01-10 | 广州赫尔普化工有限公司 | Wear-resistant heat-conducting silicone rubber composite material and preparation method thereof |
| CN115160663A (en) * | 2022-06-27 | 2022-10-11 | 青岛橡六胶管有限公司 | Wear-resistant corrosion-resistant rubber hose and preparation method thereof |
| CN115785574A (en) * | 2022-12-01 | 2023-03-14 | 南通鼎佳橡胶科技有限公司 | Preparation method and system of high-temperature-resistant rubber material |
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