A neoprene material and a method for producing the same

Abstract

The application provides a chlorobutyl rubber material and a preparation method thereof, and relates to the technical field of rubber materials.A chlorobutyl rubber material comprises the following raw materials in parts by mass: chlorobutyl rubber 100 parts, carbon black 70-80 parts, plasticizer 25-30 parts, zinc oxide 4-6 parts, magnesium oxide 2-3 parts, hydrotalcite 2-3 parts, stearic acid 0.3-0.6 parts, antioxidant 1-3 parts, oleic acid amide 2-3 parts, vulcanization accelerator 0.5-1.5 parts, and microcrystalline wax 0.3-0.6 parts.The chlorobutyl rubber material has the excellent characteristics of low-temperature resistance, low-pressure change and tear resistance.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber materials, and particularly relates to a chloroprene rubber material and a preparation method thereof. BACKGROUND

[0002] Chloroprene rubber has excellent aging resistance, oil and solvent resistance, flex resistance, ozone resistance and atmospheric aging resistance, belongs to self-reinforced rubber, and has excellent mechanical properties, so the chloroprene rubber is suitable for a ball head dust cover product of an automobile chassis. In recent years, as the automobile export to high-latitude extremely cold regions has increased sharply, the risk of low-temperature failure, sealing failure and damage failure of the ball head dust cover product also increases sharply. At the same time, the main machine factory puts forward more stringent requirements for the use performance of the dynamic sealing material of the automobile. The compression permanent deformation performance has a great influence on the sealing performance of the dust cover product, and can prevent water, dust and sand from entering the inside of the ball head pin to cause failure. Therefore, the compression permanent deformation of the chloroprene rubber for the automobile is very important, and many domestic and foreign large automobile enterprises put forward strict standards and requirements for the compression permanent deformation. Generally, the chloroprene rubber for the ball head dust cover requires a hardness of 50±5 degrees, a tensile strength of greater than or equal to 13 MPa, an elongation of greater than or equal to 350%, a compression permanent deformation (100℃*22h) of less than or equal to 35%, a brittle temperature of less than or equal to -40℃, and a tear strength (pant type) of greater than or equal to 5 N / mm. However, due to the low-temperature-resistant rubber, in order to improve the low-temperature performance, a large amount of low-molecular-weight plasticizer is usually added, the viscosity of the rubber is reduced, and the resilience of the vulcanized rubber is reduced. At the same time, the softener molecules are small, enter the gap between the rubber macromolecules, improve the sliding ability of the molecular chain, and result in large compression permanent deformation and poor tear resistance of the low-temperature-resistant rubber. Therefore, there is no report on the chloroprene rubber material which can achieve a low-temperature brittleness of less than or equal to -50℃ and has low compression permanent deformation and high tear resistance. SUMMARY

[0003] Based on the technical problems in the background art, the present application provides a chloroprene rubber material and a preparation method thereof.

[0004] The chloroprene rubber material provided by the present application comprises the following raw materials in parts by mass: chloroprene rubber 100 parts, carbon black 70-80 parts, plasticizer 25-30 parts, zinc oxide 4-6 parts, magnesium oxide 2-3 parts, hydrotalcite 2-3 parts, stearic acid 0.3-0.6 parts, antioxidant 1-3 parts, oleic acid amide 2-3 parts, vulcanization accelerator 0.5-1.5 parts, and microcrystalline wax 0.3-0.6 parts.

[0005] Preferably, the chloroprene rubber has a Mooney viscosity ML(1+4)100℃ of 60-80 and a very low crystallinity, and the yellow salt hydrochloride adjustment brand.

[0006] Preferably, the carbon black is carbon black N770.

[0007] Preferably, the plasticizer is selected from 812, one or two of the DOS.

[0008] More preferably, the plasticizer is selected from 812, the mass ratio of the DOS is (10-15):15.

[0009] Preferably, the magnesium-aluminum ratio of the hydrotalcite is 4-5.

[0010] More preferably, the hydrotalcite is DHT-4A.

[0011] Preferably, the zinc oxide is indirect zinc oxide, with a purity of ≥99.8%.

[0012] More preferably, the zinc oxide is zinc oxide BA01-05.

[0013] Preferably, the antioxidant is selected from one or two of antioxidant ODA, antioxidant MB.

[0014] Preferably, the oleic acid amide is AC-18.

[0015] The effect of adding oleic acid amide in the neoprene rubber material of the present application is to reduce the sliding friction coefficient of the material, reduce the internal heat, and prolong the service life of the material.

[0016] Preferably, the vulcanization accelerator is selected from one or two of vulcanization accelerator ETU, vulcanization accelerator TMTD.

[0017] More preferably, the mass ratio of the vulcanization accelerator ETU and the vulcanization accelerator TMTD is (0.9-1.1):0.5.

[0018] Preferably, the melting point of the microcrystalline wax is 64-68℃.

[0019] The microcrystalline wax is an internal release agent and a physical anti-ozone agent, which facilitates product demolding and at the same time enhances the static ozone resistance of the product.

[0020] The present application also proposes a preparation method of a neoprene rubber material, comprising the following steps:

[0021] S1, the raw materials are weighed according to the mass fraction, mixed, and filtered to obtain a mixed rubber material;

[0022] S2, the mixed rubber material is heat treated and sheeted to form a rubber sheet;

[0023] S3, the rubber sheet is subjected to vulcanization treatment, and the neoprene rubber material is obtained.

[0024] Preferably, in S1, the mixing temperature is 100-105℃, and the mixing time is 3-6min.

[0025] Preferably, in S2, the temperature of the hot mixing of the open mill is 30-50℃, and the time of the hot mixing is 3-5min.

[0026] Preferably, in S3, the vulcanization treatment comprises: placing the rubber sheet in a flat vulcanization press, and vulcanizing the rubber sheet for 300-600s under the condition that the pressure is 150-190Kgf / cm 2 , and the temperature is 170-180℃.

[0027] In the raw material of the present application:

[0028] The preferred chloroprene rubber has a Mooney viscosity ML(1+4)100℃ of 70 and a very low crystallinity, and is a yellow hydrochloride adjusted grade. The molecular chain of the chloroprene rubber has excellent low-temperature flexibility, and the comonomer DCB can reduce the crystallization tendency of the rubber at low temperature. The yellow hydrochloride adjusted grade has a reactive end group, which can form an additional crosslinking network, so that the vulcanized product has better mechanical properties and fatigue properties, tear resistance and dynamic crack formation ability.

[0029] Carbon black is mainly used as a reinforcing agent and a filler in rubber. With the increase of the amount of carbon black, the rigidity of the rubber block in the compressed state increases, and the crosslinking bonds are broken. At the same time, the crosslinking density increases with the increase of carbon black, so that the probability of crosslinking bond breaking increases, thereby increasing the compression permanent deformation. The higher the structure degree of carbon black, the larger the surface roughness, and the more the small pores on the surface, which can form carbon black gel with the mixed rubber, thereby improving the physical and mechanical properties of the vulcanized rubber and the ability to resist compression permanent deformation, and the compression permanent deformation is small. In addition, the morphology of the carbon black particles is good in compatibility with rubber, and the reinforcing effect on the vulcanized rubber is obvious, which can improve the modulus of the vulcanized rubber and also reduce the compression permanent deformation. The preferred carbon black in the present application is carbon black N770.

[0030] The role of the vulcanization accelerator is to make the rubber crosslinking reaction, and change from linear structure to network structure; the preferred composite vulcanization system of the present application is zinc oxide+ magnesium oxide+DHT-4A+ETU+TMTD. The zinc oxide / magnesium oxide crosslinking system matched with the accelerator ETU can improve the vulcanization speed and crosslinking density, thereby reducing the compression permanent deformation. DHT-4A can improve the tear resistance and anti-fatigue cracking performance of the rubber, and also neutralize the trace amount of hydrochloric acid generated in the crosslinking process as an acid absorbent, thereby slowing down the mold pollution and corrosion. TMTD has an anti-scorching function, which can provide good scorch protection in mixing, extrusion, molding, and injection molding, improve the mixing and mold filling capacity, and improve the operation safety.

[0031] The main role of rubber plasticizer is to reduce the Tg of CR, improve the resilience and low temperature flexibility of CR compound. But the softener enters the gap between the rubber macromolecules, reduces the crosslinking bond formation, reduces the density of crosslinking network, and increases the sliding ability of molecular chain, which will also cause the increase of compression set of vulcanized rubber. Chloroprene rubber usually uses 812 or ester plasticizer, 812 The flash point is high, the tear resistance and the resistance to extraction are good, the molecular weight of the ester plasticizer is small, the low temperature resistance is good, but the anti-extraction performance is poor. The application preferably uses 812 and DOS together. 812 and DOS synergistically improve the low temperature and anti-extraction performance.

[0032] The main role of antioxidant is to improve the heat resistance of the compound. Two or more than two antioxidants can produce synergistic effect. When two antioxidants with different activities are used together, the high-activity antioxidant provides hydrogen atoms to capture free radicals to terminate the aging chain reaction. The low-activity antioxidant can provide hydrogen atoms for the high-activity antioxidant to make the chain termination reaction continue. The application preferably uses amine antioxidant ODA, which has better heat resistance than other antioxidants, and has good protection effect on thermal oxidation, flex cracking and other damage. Heterocyclic antioxidant MB belongs to non-polluting antioxidant, which can improve the elongation retention rate of vulcanized rubber after heat aging, and also can improve the tear resistance of the compound. The combination of the two forms a synergistic effect, improves the heat resistance and tear resistance of the vulcanized rubber, and reduces the compression set.

[0033] The raw materials in the formula of the application can be purchased on the market.

[0034] The beneficial effects of the application are as follows:

[0035] In order to obtain low temperature resistant chloroprene rubber material, a large amount of low molecular weight ester plasticizer is usually added, but the ester plasticizer, on the one hand, because of the small molecular weight, will be extracted by the lubricating grease in contact during use, thereby causing the hardness of the product to increase, the durability and tear resistance to be poor, and on the other hand, the compression set performance is not good. Therefore, how to balance the low temperature resistance, low compression set and tear resistance performance has become a design difficulty.

[0036] The chloroprene rubber selected in the application is a yellow hydrochloride adjusted brand, which has very low crystallinity to ensure that the vulcanized rubber has good low temperature resistance and fatigue resistance and tear resistance; N770 carbon black is added to obtain higher elasticity and reduce the compression set; the 812 + DOS as plasticizer can better improve the low temperature and anti-extraction performance, but at the same time, the compression set will increase; the use of antioxidant ODA and antioxidant MB together can improve the heat resistance of the vulcanized rubber by using synergistic effect, thereby reducing the compression set; in particular, DHT-4A and MB and 812+DOS can well solve the problem of poor tear resistance caused by low temperature and low pressure deformation.

[0037] Compared with conventional low temperature resistant neoprene rubber, the low temperature resistant, low pressure deformation and tear resistant neoprene rubber material can be prepared by using specific raw materials in the application, which meets the requirements of low temperature resistance and tear resistance of dynamic sealing products in high latitude areas in low temperature environment, and solves the sealing failure problem of dynamic sealing products caused by large compression permanent deformation. At the same time, the application range of neoprene rubber dynamic sealing parts is also expanded, which is successfully applied to new energy automobile steering ball head dust cover and other products. BRIEF DESCRIPTION OF DRAWINGS

[0038] Figure 1 The physical property curve diagram of the rubber material prepared for example 1-2 and comparative example 1-10 of the application.

[0039] Figure 2 The long time pressure deformation curve diagram of the rubber material prepared for example 1 of the application. DETAILED DESCRIPTION

[0040] In the following, the technical scheme of the application will be described in detail through specific examples.

[0041] Example 1

[0042] A low temperature resistant, low pressure deformation and tear resistant neoprene rubber material, comprising the following raw materials by mass fraction: neoprene rubber 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, indirect zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 part, microcrystalline wax 0.5 part.

[0043] Among them, the production factory of neoprene rubber is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is yellow hydrochloride adjusted CR-126, and the very low crystallinity, the mooney viscosity ML(1+4)100℃ is 70.

[0044] The preparation method comprises the following steps:

[0045] S1, the raw materials are weighed by mass fraction, added to the internal mixer for sufficient mixing, the mixing temperature is 105℃, the mixing time is 5min, and the mixing rubber material is obtained by filtering;

[0046] S2, the rubber material is heated by the open mill at 40℃ for 5min, and then extruded into a rubber sheet;

[0047] S3, place the rubber sheet in a flat vulcanizing machine, and vulcanize under the condition of pressure 180 Kgf / cm 2 , temperature 175℃ for 420s.

[0048] Example 2

[0049] A low-temperature and low-pressure resistant tear-resistant neoprene material, comprising the following raw materials by mass fraction: neoprene 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, indirect zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 1 part, antioxidant MB 2 parts, oleic acid amide 2.5 parts, curing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts.

[0050] Among them, the manufacturer of neoprene is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is yellow hydrochloride adjusted CR-126, very low crystallinity, and the Mooney viscosity ML(1+4)100℃ is 70.

[0051] The preparation method comprises the following steps:

[0052] S1, the raw materials are weighed by mass fraction, added to the internal mixer for full mixing, the mixing temperature is 105℃, the mixing time is 5min, and the mixing rubber material is obtained by filtering;

[0053] S2, the rubber material is heated by an open mill at 50℃ for 4min, and then extruded into a rubber sheet;

[0054] S3, place the rubber sheet in a flat vulcanizing machine, and vulcanize under the condition of pressure 180 Kgf / cm 2 , temperature 175℃ for 420s.

[0055] Comparative Example 1

[0056] A neoprene material, characterized in that it comprises the following raw materials by mass fraction: neoprene 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 4 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, curing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts.

[0057] Among them, the manufacturer of neoprene is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is yellow hydrochloride adjusted CR-126, very low crystallinity, and the Mooney viscosity ML(1+4)100℃ is 70.

[0058] Comparative Example 2

[0059] A neoprene material, characterized in that it comprises the following raw materials by mass: neoprene 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, DHT-4A 4 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0060] Among them, the manufacturer of neoprene is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is CR-126 with yellow hydrochloride adjustment, very low crystallinity, and the Mooney viscosity ML(1+4)100℃ is 70.

[0061] Comparative Example 3

[0062] A neoprene material, characterized in that it comprises the following raw materials by mass: neoprene 100 parts, carbon black N770 75 parts, 812 27 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0063] Among them, the manufacturer of neoprene is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is CR-126 with yellow hydrochloride adjustment, very low crystallinity, and the Mooney viscosity ML(1+4)100℃ is 70.

[0064] Comparative Example 4

[0065] A neoprene material, characterized in that it comprises the following raw materials by mass: neoprene 100 parts, carbon black N770 75 parts, DOS 27 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0066] Among them, the manufacturer of neoprene is Arlong Xinkexing High Performance Elastomer Co., Ltd., the brand is CR-126 with yellow hydrochloride adjustment, very low crystallinity, and the Mooney viscosity ML(1+4)100℃ is 70.

[0067] Comparative Example 5

[0068] A neoprene material, characterized in that it comprises the following raw materials by mass: neoprene 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0069] The chloroprene rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4) 100℃ of 70.

[0070] Comparative Example 6

[0071] A chloroprene rubber material, characterized by comprising the following raw materials in mass parts: chloroprene rubber 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0072] The chloroprene rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4) 100℃ of 70.

[0073] Comparative Example 7

[0074] A chloroprene rubber material, characterized by comprising the following raw materials in mass parts: chloroprene rubber 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 0.8 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0075] The chloroprene rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4) 100℃ of 70.

[0076] Comparative Example 8

[0077] A chloroprene rubber material, characterized by comprising the following raw materials in mass parts: chloroprene rubber 100 parts, carbon black N770 75 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1.2 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0078] The chlorobutyl rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4)100℃ of 70.

[0079] Comparative Example 9

[0080] A chlorobutyl rubber material, characterized by comprising the following raw materials in mass parts: chlorobutyl rubber 100 parts, carbon black N770 45 parts, carbon black N550 25 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1.2 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0081] The chlorobutyl rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4)100℃ of 70.

[0082] Comparative Example 10

[0083] A chlorobutyl rubber material, characterized by comprising the following raw materials in mass parts: chlorobutyl rubber 100 parts, carbon black N770 45 parts, carbon black N550 25 parts, 812 12 parts, DOS 15 parts, zinc oxide 5 parts, magnesium oxide 2 parts, DHT-4A 2 parts, stearic acid 0.5 parts, antioxidant ODA 2 parts, antioxidant MB 1 part, oleic acid amide 2.5 parts, vulcanizing agent ETU 1.2 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0084] The chlorobutyl rubber is produced by Arlanxeo High Performance Elastomers Co., Ltd., and has a brand of CR-126, a very low crystallinity, and a Mooney viscosity ML(1+4)100℃ of 70.

[0085] The preparation method of Comparative Examples 1-10 is the same as that of Example 1.

[0086] The raw material formula of the rubber material of Examples 1-2 and Comparative Examples 1-10 is shown in Table 1 specifically:

[0087] Table 1 Raw material formula of rubber material

[0088]

[0089]

[0090] The rubber materials prepared in the examples and comparative examples were subjected to physical property tests, wherein the hardness test was performed in accordance with the GB / T 531 standard, the tensile strength and elongation at break tests were performed in accordance with the GB / T 528 standard, the brittle temperature test was performed in accordance with the GB / T 15256 standard, the compression set test was performed in accordance with the GB / T 7759 standard, and the trouser tear test was performed in accordance with the GB / T 529 standard. The test results are shown in Table 2 and Figure 1

[0091] Table 2. Test results of the properties of the rubber materials

[0092]

[0093] The performance of the low-temperature-resistant neoprene rubber material seal generally needs to meet the following standards: hardness, tensile strength, elongation at break, brittle temperature, compression set, and trouser tear strength. The hardness is used to evaluate the ability of the rubber product to resist external stress without changing, the tensile strength and elongation at break are used to evaluate the mechanical and assembly properties of the rubber product, the compression set is used to evaluate the sealing performance and service life of the rubber product, and affects the safety and reliability of product use. The brittle temperature is used to evaluate the low-temperature resistance limit of the rubber product, and the trouser tear strength is used to evaluate the tear resistance and dynamic crack formation resistance of the rubber product, which affects the reliability of the product. Therefore, in order to meet the long service life requirement of the low-temperature-resistant dynamic seal, the performance standards of the neoprene rubber are improved: the hardness is 50 ± 5 degrees, the tensile strength is ≥ 14 MPa, the elongation at break

[0094] is ≥ 450%, the compression set (100°C x 22h) is ≤ 25%, the brittle temperature is ≤ -50°C, and the trouser tear strength is ≥ 7 N / mm. As can be seen from the experimental data of the test of the examples and comparative examples, the rubber material prepared by the present application has excellent performance, low brittle temperature, high tensile strength and elongation at break, small compression set value, and high trouser tear strength, fully meeting the requirements of low-temperature-resistant rubber sealing materials. The rubber material obtained by the present application through raw material screening and control of the raw material ratio can have low-temperature resistance, low pressure change, and tear resistance.

[0095] In order to verify the sealing performance of the low-temperature-resistant neoprene rubber, the rubber material prepared in Example 1 was subjected to a 100°C long-time compression set test to evaluate the service life of the sealing product. The test results are shown in Figure 2 .

[0096] ​It can be seen that the chloroprene rubber material prepared by the specific formula has the performance of low temperature and low pressure variable resistance and tear resistance, fully meets the requirements of dynamic sealing products, has a long service life, and solves the problem of poor tear resistance caused by obtaining low temperature and low pressure variable resistance, expands the application range of chloroprene rubber dynamic sealing parts, and is successfully applied to new energy automobile steering ball head dust cover and other products.

[0097] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can make equivalent replacement or change according to the technical scheme and the inventive concept of the present application within the technical range disclosed by the present application, which should be covered in the protection scope of the present application.

Claims

1. A chlorobutyl rubber material characterized in that, The raw materials include the following quality parts: chlorobutyl rubber 100 parts, carbon black N770 70-80 parts, plasticizer 25-30 parts, zinc oxide 4-6 parts, magnesium oxide 2-3 parts, hydrotalcite DHT-4A 2-3 parts, stearic acid 0.3-0.6 parts, antioxidant 1-3 parts, oleic acid amide 2-3 parts, vulcanization accelerator 0.5-1.5 parts, microcrystalline wax 0.3-0.6 parts; the plasticizer is TegMeR ® 812、DOS; the mass ratio of TegMeR ® 812、DOS is (10-15): 15; the antioxidant is antioxidant ODA, antioxidant MB; the vulcanization accelerator is vulcanization accelerator ETU, vulcanization accelerator TMTD; the mass ratio of vulcanization accelerator ETU, vulcanization accelerator TMTD is (0.9-1.1): 0.

5.

2. The chlorobutyl rubber material according to claim 1, characterized in that, The chloroprene rubber has a Mooney viscosity ML(1+4) 100℃ of 60-80; the zinc oxide is indirect zinc oxide, and the purity is ≥99.8%.

3. A process for the preparation of a chlorobutadiene rubber material as claimed in any one of claims 1-2, characterized in that, The method comprises the following steps: S1, ingredients are weighed by mass fraction, mixed, filtered to obtain a mixed rubber material; S2, the mixed rubber material is hot-mixed on an open mill, and then sheeted to form a rubber sheet; S3, the rubber sheet is subjected to vulcanization treatment, and the rubber sheet is obtained.

4. The production method according to claim 3, characterized by, The S3 is a vulcanization process, which includes placing the rubber sheet in a flat vulcanization press, and vulcanizing the rubber sheet for 300-600 seconds under the conditions of a pressure of 150-190 Kgf / cm 2 and a temperature of 170-180°C.

5. The preparation method according to claim 3, characterized in that, In S1, the mixing temperature is 100-105℃, and the mixing time is 3-6min.

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