Chloroprene rubber material and preparation method thereof

Abstract

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

Description

Technical Field

[0001] The present invention relates to the technical field of rubber materials, in particular to a chloroprene rubber material and a preparation method thereof. Background Art

[0002] Neoprene offers excellent resistance to aging, oil and solvents, flexing, ozone, and atmospheric aging. As a self-reinforcing rubber with excellent mechanical properties, it is well-suited for use in ball joint dust covers for automotive chassis. With the recent surge in vehicle exports to high-latitude, extremely cold regions, the risk of ball joint dust cover failure due to low temperatures, seal failure, and breakage has also increased dramatically. At the same time, OEMs are placing increasingly stringent requirements on the performance of dynamic sealing materials used in automotive applications. Compression set significantly impacts the sealing performance of dust covers, preventing failures caused by water, dust, and sand intruding into the ball joint pin. Therefore, the compression set of neoprene for automotive applications is crucial, and many major domestic and international automakers have stringent standards and requirements for compression set. Typically, chloroprene rubber is used for ball head dust covers, with conventional requirements of 50±5 degrees hardness, tensile strength ≥13MPa, elongation ≥350%, compression set (100°C x 22h) ≤35%, brittle temperature ≤-40°C, and tear strength (trouser-type) ≥5N / mm. However, to improve low-temperature performance of low-temperature rubber, large amounts of low-molecular-weight plasticizers are often added, reducing the viscosity of the rubber compound and thus reducing the resilience of the vulcanized rubber. Furthermore, the smaller the softener molecules, the more they enter the gaps between the rubber macromolecules, increasing the sliding ability of the molecular chains, resulting in greater compression set and poorer tear resistance for the low-temperature rubber. Consequently, there are few reports of chloroprene rubber materials that can achieve a low-temperature brittleness below -50°C while also exhibiting low compression set and high tear resistance. Summary of the Invention

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

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

[0005] Preferably, the Mooney viscosity ML (1+4) of the chloroprene rubber at 100° C. is 60-80, the crystallinity is very low, and the grade is adjusted by yellow hydrochloride.

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

[0007] Preferably, the plasticizer is selected from 812. One or both of DOS.

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

[0009] Preferably, the magnesium to 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 both of antioxidant ODA and antioxidant MB.

[0014] Preferably, the oleamide is AC-18.

[0015] The function of adding oleamide to the chloroprene rubber material of the present invention is to reduce the sliding friction coefficient of the material, reduce the internal heat, and extend the service life of the material.

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

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

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

[0019] Microcrystalline wax is an internal release agent and physical antiozonant, which facilitates product demoulding and enhances the static ozone resistance of the product.

[0020] The present invention also provides a method for preparing a chloroprene rubber material, comprising the following steps:

[0021] S1. Weigh the raw materials by mass, mix them, and filter them to obtain a mixed rubber material;

[0022] S2, heat-refining the mixed rubber material and forming the rubber sheet;

[0023] S3, vulcanizing the rubber sheet to obtain the product.

[0024] Preferably, in the step S1, the mixing temperature is 100-105° C., and the mixing time is 3-6 minutes.

[0025] Preferably, in said S2, the temperature of the hot refining in the open mill is 30-50° C., and the hot refining time is 3-5 min.

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

[0027] Among the raw materials of the present invention:

[0028] The preferred chloroprene rubber of the present invention has a Mooney viscosity (ML(1+4)) of 70 at 100°C, very low crystallinity, and is a yellow hydrochloride-adjusted grade. The chloroprene rubber molecular chain exhibits excellent low-temperature flexibility, and its DCB comonomer can reduce the rubber's tendency to crystallize at low temperatures. The yellow hydrochloride-adjusted grade has reactive end groups that form an additional crosslinking network, resulting in vulcanized products with improved mechanical and fatigue properties, as well as tear and dynamic crack resistance.

[0029] Carbon black is mainly used as a reinforcing agent and filler in rubber. As the amount of carbon black increases, the rigidity of the rubber sample increases under compression, resulting in the destruction of cross-linking bonds. At the same time, the cross-linking density increases with the increase of carbon black, which increases the probability of cross-linking bonds being destroyed, thereby increasing the compression permanent deformation. The higher the carbon black structure, the greater the surface roughness, the more tiny pores there are on the surface, and it is easy to form carbon black gel with the rubber mix, which can improve the physical and mechanical properties of the vulcanized rubber, improve the ability to resist compression permanent deformation, and reduce compression permanent deformation. In addition, the morphology of carbon black particles is well compatible with rubber, has a significant reinforcing effect on vulcanized rubber, increases the tensile stress of the vulcanized rubber, and can also reduce compression permanent deformation. The preferred carbon black of the present invention is carbon black N770.

[0030] The function of the vulcanization accelerator is to cause the rubber to undergo a cross-linking reaction, transforming the linear structure into a network structure. The present invention preferably uses a composite vulcanization system of zinc oxide + magnesium oxide + DHT-4A + ETU + TMTD. The zinc oxide / magnesium oxide cross-linking system is combined with the accelerator ETU to increase the vulcanization rate and cross-linking density, thereby reducing compression set. DHT-4A can improve the tear strength and fatigue cracking resistance of the rubber compound. At the same time, it acts as an acid absorber to neutralize the trace hydrochloric acid generated during the cross-linking process, reducing mold contamination and corrosion. TMTD has an anti-scorch function and can provide good scorch protection during mixing, extrusion, molding, and injection molding, improving mixing and mold filling capabilities, and improving operational safety.

[0031] The main function of rubber plasticizer is to reduce the Tg of CR and improve the rebound resilience and low temperature compliance of CR rubber. However, the softener enters the gap between rubber macromolecules, reduces the formation of cross-linking bonds, reduces the density of the cross-linking network, and increases the sliding ability of the molecular chain, which will lead to an increase in the compression permanent deformation of the vulcanized rubber. Chloroprene rubber is usually used with good compatibility with the rubber matrix. 812 or ester plasticizer, 812 has a high flash point, good heat resistance, tear resistance and extraction resistance, while ester plasticizers have a small molecular weight and good low temperature resistance, but poor extraction resistance. 812 and DOS are used together. 812 and DOS work synergistically to improve low temperature and anti-extraction performance.

[0032] The main function of an antioxidant is to improve the heat resistance of the rubber compound. The combination of two or more antioxidants can produce a synergistic effect. When two antioxidants with different activities are used together, the highly active antioxidant provides hydrogen atoms to capture free radicals and terminate the aging chain reaction. The less active antioxidant can provide hydrogen atoms for the highly active antioxidant, allowing the chain termination reaction to continue. The preferred amine antioxidant ODA of the present invention has better heat resistance than other antioxidants and is very effective in protecting against damage such as thermal oxidation and flex cracking. The heterocyclic antioxidant MB is a non-polluting antioxidant that can improve the elongation retention rate of the vulcanized rubber after thermal aging and can also improve the tear resistance of the rubber compound. The two are combined and used to form a synergistic effect, improving the heat resistance and tear resistance of the vulcanized rubber and reducing compression set.

[0033] The raw materials described in the formulation of the present invention can all be purchased commercially.

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

[0035] To achieve low-temperature resistance in chloroprene rubber, a large amount of low-molecular-weight ester plasticizers is typically added. However, due to their low molecular weight, ester plasticizers can be extracted by contacting grease during use, increasing the hardness of the product and reducing durability and tear resistance. Furthermore, they can negatively impact compression set performance. Therefore, balancing low-temperature resistance, low compression set, and tear resistance becomes a design challenge.

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

[0037] Compared to conventional low-temperature-resistant chloroprene rubber, this invention utilizes a specific raw material formula to produce a chloroprene rubber material with exceptional low-temperature resistance, low compression set, and tear resistance. This meets the low-temperature and tear resistance requirements of dynamic sealing products in high-latitude environments, resolving the seal failure issue caused by significant compression set in dynamic sealing products. This also expands the application range of chloroprene rubber dynamic seals, with successful applications in products such as steering ball head dust covers for new energy vehicles. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 The physical property curves of the rubber materials prepared in Examples 1-2 and Comparative Examples 1-10 of the present invention are shown.

[0039] Figure 2 This is a long-term compression curve of the rubber material prepared in Example 1 of the present invention. DETAILED DESCRIPTION

[0040] The technical solution of the present invention is described in detail below through specific embodiments.

[0041] Example 1

[0042] A low-temperature-resistant, low-pressure-deformation, and tear-resistant chloroprene rubber material, comprising the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0043] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0044] The preparation method comprises the following steps:

[0045] S1. Weigh the raw materials by mass, add them into an internal mixer and mix them thoroughly at a mixing temperature of 105°C for 5 min, and filter to obtain a mixed rubber material;

[0046] S2, the rubber compound is heated in an open mill at 40° C. for 5 min, and then extruded to obtain a rubber sheet;

[0047] S3, place the rubber sheet in a flat vulcanizing press at a pressure of 180Kgf / cm 2 , vulcanize for 420s at a temperature of 175°C.

[0048] Example 2

[0049] A low-temperature-resistant, low-pressure-deformation, and tear-resistant chloroprene rubber material, comprising the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0050] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0051] The preparation method comprises the following steps:

[0052] S1. Weigh the raw materials by mass, add them into an internal mixer and mix them thoroughly at a mixing temperature of 105°C for 5 min, and filter to obtain a mixed rubber material;

[0053] S2, the rubber compound is heated in an open mill at 50° C. for 4 min, and then extruded to obtain a rubber sheet;

[0054] S3, place the rubber sheet in a flat vulcanizing press at a pressure of 180Kgf / cm 2 , vulcanize for 420s at a temperature of 175°C.

[0055] Comparative Example 1

[0056] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0057] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0058] Comparative Example 2

[0059] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0060] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0061] Comparative Example 3

[0062] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0063] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0064] Comparative Example 4

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

[0066] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0067] Comparative Example 5

[0068] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0069] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0070] Comparative Example 6

[0071] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0072] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0073] Comparative Example 7

[0074] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 0.8 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0075] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0076] Comparative Example 8

[0077] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 75 parts of carbon black N770, 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, oleamide 2.5 parts, vulcanizing agent ETU 1.2 parts, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0078] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0079] Comparative Example 9

[0080] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 45 parts of carbon black N770, 25 parts of carbon black N550, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0081] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0082] Comparative Example 10

[0083] A chloroprene rubber material, characterized in that it comprises the following raw materials in parts by mass: 100 parts of chloroprene rubber, 35 parts of carbon black N770, 40 parts of white carbon black, 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, oleamide 2.5 parts, vulcanizing agent ETU 1 part, accelerator TMTD 0.5 parts, microcrystalline wax 0.5 parts;

[0084] Among them, the manufacturer of chloroprene rubber is Alanxin High Performance Elastomer Co., Ltd., and the brand is CR-126 adjusted with yellow hydrochloride, which has very low crystallinity and its Mooney viscosity ML (1+4) at 100℃ is 70.

[0085] The preparation methods of Comparative Examples 1-10 are the same as those of Example 1.

[0086] The specific formulas of the rubber material raw materials of Examples 1-2 and Comparative Examples 1-10 are shown in Table 1:

[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 conducted in accordance with GB / T 531, the tensile strength and elongation at break were conducted in accordance with GB / T 528, the brittle temperature test was conducted in accordance with GB / T 15256, the compression set test was conducted in accordance with GB / T 7759, and the trouser tear test was conducted in accordance with GB / T 529. The test results are shown in Table 2 and Figure 1 As shown:

[0091] Table 2 Performance test results of rubber materials

[0092]

[0093] The performance of low-temperature resistant chloroprene rubber material seals usually needs to meet the following standards: hardness, tensile strength, elongation at break, brittle temperature, compression set, and trouser-type tear strength. Hardness is used to evaluate the ability of rubber products to resist external stress without changing, tensile strength and elongation at break are used to evaluate the mechanical and assembly properties of rubber products, and compression set is used to evaluate the sealing performance and service life of rubber products, affecting the safety and reliability of product use. Brittle temperature is used to evaluate the low-temperature resistance limit of rubber products, and trouser-type tear strength is used to evaluate the tear resistance and resistance to dynamic crack formation of rubber products, affecting the reliability of the product. To this end, in order to meet the long-term service life requirements of low-temperature resistant dynamic seals, the performance standards of chloroprene rubber have been improved: hardness of 50±5 degrees, tensile strength ≥14MPa, elongation at break.

[0094] ≥450%, compression set (100°C x 22h) ≤25%, brittle temperature ≤-50°C, and trouser-type tear strength ≥7N / mm. The experimental data from the examples and comparative examples demonstrate that the rubber material produced by the present invention exhibits excellent performance, including a low brittle temperature, high tensile strength and elongation at break, low compression set, and high trouser-type tear strength, fully meeting the requirements for low-temperature-resistant rubber sealing materials. By screening raw materials and controlling the raw material ratios, the present invention achieves rubber materials that exhibit low-temperature resistance, low compression set, and tear resistance.

[0095] In order to verify the sealing performance of low temperature resistant chloroprene rubber, the rubber material prepared in Example 1 was subjected to a long-term compression permanent deformation test at 100°C to evaluate the life of the sealing product. Figure 2 .

[0096] It can be seen that the chloroprene rubber material prepared by the specific formula of the present invention has the properties of resistance to low temperature, low pressure change and tearing, which fully meets the requirements of dynamic sealing products. The product has a long service life and effectively solves the problem of deterioration of tearing resistance caused by obtaining resistance to low temperature and low pressure change. At the same time, it also expands the application range of chloroprene rubber dynamic seals and has been successfully applied to products such as dust covers of steering ball joints of new energy vehicles.

[0097] The above description is only a preferred specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any technician familiar with the technical field, within the technical scope disclosed by the present invention, who makes equivalent replacements or changes based on the technical solution and inventive concept of the present invention, should be covered by the scope of protection of the present invention.

Claims

1. A chloroprene rubber material, characterized in that: The invention comprises the following raw materials in parts by weight: 100 parts of chloroprene rubber, 70-80 parts of carbon black, 25-30 parts of plasticizer, 4-6 parts of zinc oxide, 2-3 parts of magnesium oxide, 2-3 parts of hydrotalcite, 0.3-0.6 parts of stearic acid, 1-3 parts of antioxidant, 2-3 parts of oleamide, 0.5-1.5 parts of vulcanization accelerator and 0.3-0.6 parts of microcrystalline wax.

2. The chloroprene rubber material according to claim 1, characterized in that: The plasticizer is selected from 812. One or both of DOS.

3. The chloroprene rubber material according to claim 2, characterized in that: The 812. The mass ratio of DOS is (10-15):

15.

4. The chloroprene rubber material according to claim 1, characterized in that: The vulcanization accelerator is selected from one or two of the vulcanization accelerator ETU and the vulcanization accelerator TMTD; the mass ratio of the vulcanization accelerator ETU to the vulcanization accelerator TMTD is (0.9-1.1):0.

5.

5. The chloroprene rubber material according to claim 1, characterized in that: The Mooney viscosity ML (1+4) of the chloroprene rubber at 100° C. is 60-80; the antioxidant is selected from one or two of antioxidant ODA and antioxidant MB; the zinc oxide is indirect zinc oxide with a purity of ≥99.8%; and the magnesium-aluminum ratio of the hydrotalcite is 4-5.

6. A method for preparing a chloroprene rubber material as claimed in any one of claims 1 to 5, characterized in that: The steps include: S1. Weigh the raw materials by mass, mix them, and filter them to obtain a mixed rubber material; S2, heat-refining the mixed rubber material on an open mill, and forming the rubber sheet into a rubber sheet; S3, vulcanizing the rubber sheet to obtain the product.

7. The preparation method according to claim 6, characterized in that: In the above S3, the vulcanization treatment comprises: placing the rubber sheet in a flat vulcanization press at a pressure of 150-190 Kgf / cm 2 , vulcanization treatment at a temperature of 170-180°C for 300-600s.

8. The preparation method according to claim 6, characterized in that: In the above-mentioned S1, the mixing temperature is 100-105° C., and the mixing time is 3-6 min.

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