CN114015166A - EPDM rubber foaming material and application - Google Patents
EPDM rubber foaming material and application Download PDFInfo
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- CN114015166A CN114015166A CN202111333882.XA CN202111333882A CN114015166A CN 114015166 A CN114015166 A CN 114015166A CN 202111333882 A CN202111333882 A CN 202111333882A CN 114015166 A CN114015166 A CN 114015166A
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- 229920002943 EPDM rubber Polymers 0.000 title claims abstract description 46
- 238000005187 foaming Methods 0.000 title claims abstract description 38
- 239000000463 material Substances 0.000 title claims abstract description 26
- 229920001971 elastomer Polymers 0.000 claims abstract description 38
- 239000006229 carbon black Substances 0.000 claims abstract description 29
- XLOMVQKBTHCTTD-UHFFFAOYSA-N Zinc monoxide Chemical compound [Zn]=O XLOMVQKBTHCTTD-UHFFFAOYSA-N 0.000 claims abstract description 22
- 239000004088 foaming agent Substances 0.000 claims abstract description 21
- NBOCQTNZUPTTEI-UHFFFAOYSA-N 4-[4-(hydrazinesulfonyl)phenoxy]benzenesulfonohydrazide Chemical compound C1=CC(S(=O)(=O)NN)=CC=C1OC1=CC=C(S(=O)(=O)NN)C=C1 NBOCQTNZUPTTEI-UHFFFAOYSA-N 0.000 claims abstract description 16
- 239000005662 Paraffin oil Substances 0.000 claims abstract description 11
- 235000021355 Stearic acid Nutrition 0.000 claims abstract description 11
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 claims abstract description 11
- OQCDKBAXFALNLD-UHFFFAOYSA-N octadecanoic acid Natural products CCCCCCCC(C)CCCCCCCCC(O)=O OQCDKBAXFALNLD-UHFFFAOYSA-N 0.000 claims abstract description 11
- 239000008117 stearic acid Substances 0.000 claims abstract description 11
- 239000011787 zinc oxide Substances 0.000 claims abstract description 11
- NINIDFKCEFEMDL-UHFFFAOYSA-N Sulfur Chemical compound [S] NINIDFKCEFEMDL-UHFFFAOYSA-N 0.000 claims abstract description 9
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 8
- 229920001807 Urea-formaldehyde Polymers 0.000 claims abstract description 7
- 229910052717 sulfur Inorganic materials 0.000 claims abstract description 7
- 239000011593 sulfur Substances 0.000 claims abstract description 7
- 230000003712 anti-aging effect Effects 0.000 claims abstract description 6
- 239000006260 foam Substances 0.000 claims description 19
- 238000013040 rubber vulcanization Methods 0.000 claims description 18
- 238000004073 vulcanization Methods 0.000 claims description 17
- 239000004156 Azodicarbonamide Substances 0.000 claims description 9
- XOZUGNYVDXMRKW-AATRIKPKSA-N azodicarbonamide Chemical compound NC(=O)\N=N\C(N)=O XOZUGNYVDXMRKW-AATRIKPKSA-N 0.000 claims description 9
- 235000019399 azodicarbonamide Nutrition 0.000 claims description 9
- AFZSMODLJJCVPP-UHFFFAOYSA-N dibenzothiazol-2-yl disulfide Chemical compound C1=CC=C2SC(SSC=3SC4=CC=CC=C4N=3)=NC2=C1 AFZSMODLJJCVPP-UHFFFAOYSA-N 0.000 claims description 6
- BOXSVZNGTQTENJ-UHFFFAOYSA-L zinc dibutyldithiocarbamate Chemical compound [Zn+2].CCCCN(C([S-])=S)CCCC.CCCCN(C([S-])=S)CCCC BOXSVZNGTQTENJ-UHFFFAOYSA-L 0.000 claims description 6
- 239000003963 antioxidant agent Substances 0.000 claims description 3
- 230000003078 antioxidant effect Effects 0.000 claims description 3
- 238000000465 moulding Methods 0.000 claims description 3
- 239000006261 foam material Substances 0.000 claims 2
- 238000000034 method Methods 0.000 abstract description 15
- 230000008569 process Effects 0.000 abstract description 9
- 239000012752 auxiliary agent Substances 0.000 abstract description 6
- XSQUKJJJFZCRTK-UHFFFAOYSA-N Urea Chemical compound NC(N)=O XSQUKJJJFZCRTK-UHFFFAOYSA-N 0.000 abstract description 3
- 239000004202 carbamide Substances 0.000 abstract description 3
- 230000006835 compression Effects 0.000 abstract description 2
- 238000007906 compression Methods 0.000 abstract description 2
- 239000004636 vulcanized rubber Substances 0.000 abstract description 2
- 235000019241 carbon black Nutrition 0.000 description 20
- 230000000052 comparative effect Effects 0.000 description 10
- 229920001821 foam rubber Polymers 0.000 description 7
- 239000000203 mixture Substances 0.000 description 6
- LELOWRISYMNNSU-UHFFFAOYSA-N hydrogen cyanide Chemical compound N#C LELOWRISYMNNSU-UHFFFAOYSA-N 0.000 description 5
- 230000000704 physical effect Effects 0.000 description 5
- 238000002360 preparation method Methods 0.000 description 5
- 150000001875 compounds Chemical class 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 239000004604 Blowing Agent Substances 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000000354 decomposition reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 239000011159 matrix material Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 238000011056 performance test Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- ZCYVEMRRCGMTRW-UHFFFAOYSA-N 7553-56-2 Chemical compound [I] ZCYVEMRRCGMTRW-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- VJRITMATACIYAF-UHFFFAOYSA-N benzenesulfonohydrazide Chemical compound NNS(=O)(=O)C1=CC=CC=C1 VJRITMATACIYAF-UHFFFAOYSA-N 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000013329 compounding Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 229910052740 iodine Inorganic materials 0.000 description 1
- 239000011630 iodine Substances 0.000 description 1
- 238000010030 laminating Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 238000010074 rubber mixing Methods 0.000 description 1
- 125000000391 vinyl group Chemical group [H]C([*])=C([H])[H] 0.000 description 1
- 229920002554 vinyl polymer Polymers 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/102—Azo-compounds
- C08J9/103—Azodicarbonamide
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0014—Use of organic additives
- C08J9/0023—Use of organic additives containing oxygen
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0066—Use of inorganic compounding ingredients
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/0095—Mixtures of at least two compounding ingredients belonging to different one-dot groups
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
- C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
- C08J9/06—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent
- C08J9/10—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a chemical blowing agent developing nitrogen, the blowing agent being a compound containing a nitrogen-to-nitrogen bond
- C08J9/104—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof
- C08J9/105—Hydrazines; Hydrazides; Semicarbazides; Semicarbazones; Hydrazones; Derivatives thereof containing sulfur
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01B—PERMANENT WAY; PERMANENT-WAY TOOLS; MACHINES FOR MAKING RAILWAYS OF ALL KINDS
- E01B7/00—Switches; Crossings
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/04—N2 releasing, ex azodicarbonamide or nitroso compound
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2203/00—Foams characterized by the expanding agent
- C08J2203/18—Binary blends of expanding agents
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/16—Ethene-propene or ethene-propene-diene copolymers
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Inorganic Chemistry (AREA)
- Mechanical Engineering (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Emergency Medicine (AREA)
- Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
Abstract
The application relates to the technical field of rubber, in particular to an EPDM rubber foaming material and application. The EPDM rubber foaming material comprises the following components in parts by weight: 40-60 parts of EPDM4045, 12-23 parts of paraffin oil, 2-2.5 parts of zinc oxide, 1-1.5 parts of stearic acid, 0.8-1.5 parts of anti-aging agent TMQ, 1.3-1.4 parts of accelerator, 0.8-10 parts of foaming agent, 0.4-0.5 part of sulfur, 30-36 parts of carbon black and 0.3-0.5 part of urea resin BK; the EPDM4045 vulcanized rubber has larger compression permanent deformation degree and slightly smaller rebound value; and the foaming process can be effectively controlled by the application of foaming agents OBSH and AC and urea auxiliary agent BK in EPDM4045 foamed rubber, the foaming aperture can be controlled within 13 mu m, and the comprehensive performance of EPDM4045 foamed rubber products can reach and exceed the railway industry standard.
Description
Technical Field
The application relates to the technical field of rubber, in particular to an EPDM rubber foaming material and application thereof.
Background
In the field of railway rubber turnout products, high-performance foamed rubber materials are applied more and more, and the requirements are higher and higher. At present, EPDM9090 and EPDM9950 are mainly used as main materials in other industries to carry out a rapid vulcanization system, and in the railway turnout rubber base plate industry, the strict requirements newly proposed at the present stage cannot be met by using the traditional process. Trial production according to the performance and specification requirements of customers shows that although the rapid vulcanization system taking EPDM9090 and EPDM9950 as main materials has higher foaming efficiency, the detection shows that the indexes such as tensile elongation, stress at definite elongation and the like do not meet the requirements. Therefore, it is necessary to research the properties and foaming effects of different vulcanization systems and different rubber materials to make the EPDM rubber foaming material have better properties so as to meet the requirements of the railway industry.
Disclosure of Invention
The application provides an EPDM rubber foaming material and application to solve the technical problem that the performance of the existing EPDM rubber foaming material does not reach the standard.
In a first aspect, the present application provides an EPDM rubber foam, which comprises the following components in parts by weight: 40-60 parts of EPDM4045, 12-23 parts of paraffin oil, 2-2.5 parts of zinc oxide, 1-1.5 parts of stearic acid, 0.8-1.5 parts of anti-aging agent TMQ, 1.3-1.4 parts of accelerator, 0.8-10 parts of foaming agent, 0.4-0.5 part of sulfur, 30-36 parts of carbon black and 0.3-0.5 part of urea resin BK.
Optionally, the accelerators include rubber vulcanization accelerator ZDBC, rubber vulcanization accelerator MBTS, and vulcanization accelerator TRA.
Optionally, the weight ratio of the rubber vulcanization accelerator ZDBC, the rubber vulcanization accelerator MBTS, and the vulcanization accelerator TRA is 6:5: 3.
Optionally, the blowing agent comprises azodicarbonamide and OBSH.
Optionally, the weight ratio of azodicarbonamide to OBSH is 0.75: 1.
Optionally, the carbon black includes carbon black N330 and carbon black N550.
Optionally, the weight ratio of the carbon black N330 to the carbon black N550 is 26: 10.
Optionally, the EPDM rubber foaming material comprises the following components in parts by weight: 50 parts of EPDM4045, 2.3 parts of paraffin oil, 2.5 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of an antioxidant TMQ, 0.6 part of a rubber vulcanization accelerator ZDBC, 0.5 part of the rubber vulcanization accelerator MBTS, 0.3 part of the vulcanization accelerator TRA, 0.75 part of azodicarbonamide, 1 part of OBSH, 0.5 part of sulfur, 26 parts of carbon black N330, 10 parts of carbon black N550 and 0.5 part of urea resin BK.
In a second aspect, the present application provides the use of the EPDM rubber foam of the first aspect, which includes the use of the EPDM rubber foam in the preparation of a foamed rubber switch pad.
In a third aspect, the present application provides a foamed rubber switch pad made from the EPDM rubber foam of the first aspect by high temperature molding.
Compared with the prior art, the technical scheme of the application has the following advantages:
the EPDM4045 is adopted as the matrix, because the EPDM4045 raw rubber has large vinyl mass fraction, small iodine value and small difference between the average relative molecular mass and the distribution thereof, the Mooney viscosity of the EPDM4045 rubber compound is close, the vulcanization rate is slightly small, the elastic torque is low, the compression permanent deformation degree of the EPDM4045 vulcanized rubber is large, and the rebound value is slightly small; the foaming process can be effectively controlled by the foaming agent OBSH and AC and the urea assistant BK in the EPDM4045 foaming rubber, the pore diameter of the foaming agent can be controlled within 13 mu m, the comprehensive performance of the EPDM4045 foaming rubber product can reach and exceed the railway industry standard, and the technical problem that the performance of the existing EPDM rubber foaming material cannot reach the standard is solved.
Detailed Description
The following further describes the claimed embodiments with reference to specific embodiments (including examples), but not as limitations to the claimed embodiments. The details which are not described in detail below are all common technical knowledge or conventional technical means in the field.
In a first aspect, the present application provides an EPDM rubber foam, which comprises the following components in parts by weight: 40-60 parts of EPDM4045, 12-23 parts of paraffin oil, 2-2.5 parts of zinc oxide, 1-1.5 parts of stearic acid, 0.8-1.5 parts of anti-aging agent TMQ, 1.3-1.4 parts of accelerator, 0.8-10 parts of foaming agent, 0.4-0.5 part of sulfur, 30-36 parts of carbon black and 0.3-0.5 part of urea resin BK.
In the technical scheme of the application, the application of the urea auxiliary agent BK can promote the dispersing performance of the rubber material. Because the decomposition temperature of the foaming agent OBSH and AC is high, the residue after foaming is odorous, and after the BK auxiliary agent is added, the decomposition temperature of the foaming agent OBSH and AC can be effectively reduced to 120 ℃; meanwhile, the problems of odor, color change and pollution generated by foaming agents OBSH and AC in the foaming process can be inhibited. The combination of the foaming agent OBSH, the foaming agent AC and the auxiliary agent BK can effectively improve the defects of uneven foaming holes and unsmooth appearance quality of the EPDM4045 foamed rubber product, so that the EPDM4045 foamed rubber product can ensure the quality as a railway turnout product and has extremely excellent appearance quality.
In practice, the preparation method of the EPDM rubber foaming material can be as follows: preparing raw materials; adding EPDM raw rubber into an internal mixer, and adding a foaming agent, zinc oxide and stearic acid after the torque is stable; then adding the rest components into the mixture for mixing; after discharging, thinly passing the lower sheet on an open mill, and standing for later use; cutting the rubber compound into a sample, placing the sample on a flat vulcanizing machine, and vulcanizing and foaming by adopting a mould pressing method; and (4) laminating and compounding the rubber compound, placing the rubber compound into a mold for foaming and vulcanization to obtain the EPDM rubber foaming material.
The method specifically comprises the following steps: the initial temperature of an internal mixer is 70-90 ℃, the rotating speed is 40-45r/min, EPDM raw rubber is added, foaming agent AC, zinc oxide and stearic acid are added after torque is stable, then filler and paraffin oil are added for 2-3 times, finally, the rest components such as vulcanizing agent DCP and co-vulcanizing agent are added, mixing is carried out for about l0 min, the rubber discharging temperature exceeds l30 ℃, thinning and passing are carried out on an open mill after discharging, the sheet feeding can be carried out for 9-10 times, the sheet feeding is parked for 12 hours for standby, the rubber mixing and cutting are carried out, the vulcanization foaming is carried out on a flat vulcanizing machine by adopting a mould pressing method, and the vulcanization temperature is 150-l70 ℃.
As an alternative embodiment, the accelerators include rubber vulcanization accelerator zdbc (bz), rubber vulcanization accelerator mbts (dm), vulcanization accelerator tra (dptt).
As an alternative embodiment, the rubber vulcanization accelerator zdbc (bz), the rubber vulcanization accelerator mbts (dm), the vulcanization accelerator tra (dptt) are in a weight ratio of 6:5: 3.
In the present application, the rubber vulcanization accelerator zdbc (bz), the rubber vulcanization accelerator mbts (dm), and the vulcanization accelerator tra (dptt) are controlled in a weight ratio of 6:5:3 because the control of the foamed cell diameter in the EPDM rubber foam to 13 μm or less is ensured, and if the ratio is more than 6:5:3, the foamed cell diameter is not uniform, and if the ratio is less than 6:5:3, the foamed cell diameter is larger than 50 μm, and if the ratio is less than 6:5:3, the foamed cell diameter is larger, and the tensile elongation is poor.
As an alternative embodiment, the blowing agent comprises azodicarbonamide and OBSH.
As an alternative embodiment, the weight ratio of azodicarbonamide to OBSH is 0.75: 1.
In the present application, the reason for controlling the weight ratio of the azodicarbonamide (foaming agent AC) to the OBSH (4, 4-oxybis benzenesulfonylhydrazide) to be 0.75:1 is to accelerate the foaming speed while ensuring the foaming quality, and if the ratio is greater than 0.75:1, the foaming speed is too fast, the foaming quality is not good, the pore size is not uniform, and if the ratio is less than 0.75:1, the foaming speed is slow.
As an alternative embodiment, the carbon blacks include carbon black N330 and carbon black N550.
As an alternative embodiment, the weight ratio of the carbon black N330 to the carbon black N550 is 26: 10.
In the application, the reason for controlling the weight ratio of the carbon black N330 to the carbon black N550 to be 26:10 is to improve the tensile elongation rate on the premise of ensuring the tensile strength, if the ratio is greater than 26:10, the influence of overlarge strength and poor tensile elongation rate can be caused, and if the ratio is less than 26:10, the adverse influence of substandard tensile strength can be caused.
The invention adopts high-reinforcement carbon black and semi-reinforcement carbon black for filling in the preparation of the foamed rubber taking EPDM4045 as a matrix, and researches the influence of the preparation process and the forming condition of the EPDM4045 foamed rubber on the foaming process. Then, the dosage of the accelerator, the filler, the foaming agent, the auxiliary agent and the paraffin oil is improved, and the vulcanization performance and the mechanical property analysis are carried out. The effect of various factors on the structure and properties of the foamed material is discussed. The influence rule of foaming agents OBSH, AC and an auxiliary agent BK in the formula on the foaming process under the action of the accelerators BZ and DPTT is summarized, and the proper formula dosage is found, so that the optimal physical property of the railway foaming rubber base plate is achieved, and the railway foaming rubber base plate has high stability, high insulativity and high weather resistance.
In a second aspect, the present application provides the use of the EPDM rubber foam of the first aspect, which includes the use of the EPDM rubber foam in the preparation of a foamed rubber switch pad.
In a third aspect, the present application provides a foamed rubber switch pad made from the EPDM rubber foam of the first aspect by high temperature molding.
Example 1:
in this embodiment, the EPDM rubber foaming material comprises the following components in parts by weight: 40-60 parts of EPDM4045, 12-23 parts of paraffin oil, 2-2.5 parts of zinc oxide, 1-1.5 parts of stearic acid, 0.8-1.5 parts of antioxidant TMQ, 1.3-1.4 parts of accelerator, 0.8-10 parts of foaming agent, 0.4-0.5 part of sulfur, 30-36 parts of carbon black and 0.3-0.5 part of urea resin BK, wherein the specific components are shown in Table 1, the EPDM rubber foaming material is prepared into a foaming rubber pad, and the related performance is tested in Table 2.
Table 1: EPDM (4045) rubber foam composition Table of example 1.
Table 2: physical properties of the EPDM (4045) foam rubber gasket of example 1.
Comparative example 1:
the rubber foam composition of the comparative example is shown in Table 3, and the EPDM rubber foam is used to prepare a foamed rubber pad, and the related performance test is shown in Table 4.
Table 3: EPDM (9950) rubber foam composition Table for comparative example 1.
| Type of material | Weight (KG) |
| EPDM9950 | 50 |
| Semi-reinforced | 30 |
| Paraffin oil | 13.5 |
| Zinc oxide<The content of the indirect method is more than or equal to 99.7 percent> | 2 |
| Stearic acid | 1 |
| Anti-aging agent TMQ | 0.8 |
| Accelerant BZ | 0.7 |
| Accelerator DCP | 0.6 |
| Foaming agent AC | 1 |
| Sulfur powder | 0.4 |
Table 4: physical properties of the EPDM (9950) foam rubber pad of comparative example 1.
Comparative example 2:
the rubber foam composition of the comparative example is shown in Table 5, and the EPDM rubber foam is used to prepare a foamed rubber pad, and the relevant performance test is shown in Table 6.
Table 5: EPDM (9090) rubber foam composition Table for comparative example 2.
| Type of material | Weight (KG) |
| EPDM 9090 | 45 |
| Semi-reinforced | 25 |
| White carbon black | 10.5 |
| Paraffin oil | 12 |
| Zinc oxide<The content of the indirect method is more than or equal to 99.7 percent> | 1.7 |
| Stearic acid | 1 |
| Anti-aging agent TMQ | 1 |
| Accelerant BZ | 1.2 |
| Accelerator DM | 0.6 |
| Foaming agent AC | 1.5 |
| Sulfur powder | 0.5 |
Table 6: physical properties of the EPDM (9090) foamed rubber gasket of comparative example 2.
As is apparent from tables 2, 4 and 6, the comparative example group had the cell size of the foams of 45 to 66 μm and 42 to 63 μm, while the examples had the cell size of the foams within 13 μm; the tensile strength of the comparative example group is 10.2MPa and 11.9MPa, the tensile elongation is 213 percent and 249 percent, and the 200 percent stress at definite elongation is 7.5MPa and 8.6MPa, while the tensile strength of the example is 16.5MPa, the tensile elongation is 345 percent, and the 200 percent stress at definite elongation is 11.7MPa, and the physical properties of the foamed rubber pad of the embodiment of the invention meet the requirements, and the foamed rubber pad can be used for railway turnout rubber pads.
It should be noted that the technical solution of the present invention is not limited to the above-mentioned embodiments, and other embodiments can be formed within the scope of the technical solution of the present invention to achieve the object of the present invention, which is not listed here.
It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The foregoing are merely exemplary embodiments of the present invention, which enable those skilled in the art to understand or practice the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. The EPDM rubber foaming material is characterized by comprising the following components in parts by weight: 40-60 parts of EPDM4045, 12-23 parts of paraffin oil, 2-2.5 parts of zinc oxide, 1-1.5 parts of stearic acid, 0.8-1.5 parts of anti-aging agent TMQ, 1.3-1.4 parts of accelerator, 0.8-10 parts of foaming agent, 0.4-0.5 part of sulfur, 30-36 parts of carbon black and 0.3-0.5 part of urea resin BK.
2. The EPDM rubber foam of claim 1, wherein the accelerator includes a rubber vulcanization accelerator ZDBC, a rubber vulcanization accelerator MBTS, and a vulcanization accelerator TRA.
3. The EPDM rubber foamed material according to claim 2, wherein a weight ratio of said rubber vulcanization accelerator ZDBC, said rubber vulcanization accelerator MBTS, and said vulcanization accelerator TRA is 6:5: 3.
4. The EPDM rubber foam of claim 1, wherein the foaming agent includes azodicarbonamide and OBSH.
5. The EPDM rubber foamed material according to claim 4, wherein the weight ratio of azodicarbonamide to OBSH is 0.75: 1.
6. The EPDM rubber foam of claim 1, wherein the carbon black includes carbon black N330 and carbon black N550.
7. The EPDM rubber foamed material according to claim 6, wherein a weight ratio of said carbon black N330 to said carbon black N550 is 26: 10.
8. The EPDM rubber foam of claim 1, wherein the components of the EPDM rubber foam include, in parts by weight: 50 parts of EPDM4045, 2.3 parts of paraffin oil, 2.5 parts of zinc oxide, 1.5 parts of stearic acid, 1 part of an antioxidant TMQ, 0.6 part of a rubber vulcanization accelerator ZDBC, 0.5 part of the rubber vulcanization accelerator MBTS, 0.3 part of the vulcanization accelerator TRA, 0.75 part of azodicarbonamide, 1 part of OBSH, 0.5 part of sulfur, 26 parts of carbon black N330, 10 parts of carbon black N550 and 0.5 part of urea resin BK.
9. Use of an EPDM rubber foam material for producing a foamed rubber switch pad, said use comprising the use of an EPDM rubber foam material as claimed in any one of claims 1 to 8.
10. A foamed rubber switch pad characterized in that it is obtained by high temperature molding of the EPDM rubber foam of any one of claims 1 to 8.
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Application publication date: 20220208 |