Fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber materials and their preparation methods

Abstract

This invention relates to the field of rubber materials technology. It provides a chlorohydrin rubber material with fatigue resistance, low-temperature resistance, and low air permeability, as well as its preparation method. The raw materials of the chlorohydrin rubber material, by weight, include 95-105 parts of chlorohydrin rubber, 33-37 parts of carbon black, 0.29-0.31 parts of sulfur, 0.9-1.1 parts of accelerator CZ, 1.1-1.3 parts of accelerator ETU, 4.8-5.2 parts of acid scavenger, 2.8-3.2 parts of antioxidant, 13-17 parts of plasticizer, 1.3-1.7 parts of dispersant, 1.5-2.5 parts of lubricant, and 2.0-3.0 parts of sodium stearate. The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber with a chlorine content of 24-26%. The chlorohydrin rubber material of this invention, without adding homopolymer raw rubber, can simultaneously satisfy the requirements of high fatigue resistance, excellent low-temperature resistance, and low air permeability.

Description

Technical Field

[0001] This invention relates to the field of rubber materials technology, and more specifically, to a chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability, and its preparation method. Background Technology

[0002] Chloroprene rubber (CRB) is suitable for use in energy storage diaphragm products in the automotive and industrial fields due to its excellent resistance to oil, ozone, heat aging, and gas permeation. In practical applications, CRB must simultaneously meet three key performance requirements: 1. High dynamic fatigue resistance: The flexural life must reach over 600,000 cycles to withstand high-frequency reciprocating motion; 2. Excellent low-temperature flexibility: The low-temperature brittleness temperature must reach below -45°C to ensure normal operation in extremely cold high-latitude regions; 3. Low gas permeability: For example, nitrogen permeability ≤30% to ensure the airtightness of the pneumatic system.

[0003] Homopolymer chlorohydrin rubbers exhibit high polarity, high air permeability, and good fatigue resistance, but poor low-temperature resistance. Binary copolymer chlorohydrin rubbers, while having lower air permeability and fatigue resistance than homopolymer chlorohydrin rubbers, possess excellent low-temperature performance. Currently, to balance these properties, traditional technologies typically employ a combination of binary copolymer chlorohydrin rubbers and homopolymer chlorohydrin rubbers. However, while homopolymer chlorohydrin rubbers improve air tightness and fatigue resistance, their high molecular chain regularity leads to significantly reduced low-temperature brittleness and makes it difficult to simultaneously meet high-frequency fatigue life requirements. Achieving a balance between high low-temperature resistance, high fatigue resistance, and low air permeability solely through the synergistic design of the formulation system, without completely abandoning homopolymer raw rubber, remains a key technical challenge for the industry.

[0004] In view of this, the present invention is hereby proposed. Summary of the Invention

[0005] The purpose of this invention is to propose a chlorohydrin rubber material and preparation method with fatigue resistance, low temperature resistance and low air permeability, so as to solve the problem that in the prior art, chlorohydrin rubber materials cannot simultaneously meet the requirements of high fatigue resistance, excellent low temperature resistance and low air permeability without the addition of homopolymer raw rubber, and therefore cannot be used in energy storage membrane products in the fields of new energy vehicles and industry.

[0006] To achieve the above objectives, the technical solution of the present invention is implemented as follows:

[0007] A fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material, wherein the raw materials of the chlorohydrin rubber material, by weight, include 95-105 parts of chlorohydrin rubber, 33-37 parts of carbon black, 0.29-0.31 parts of sulfur, 0.9-1.1 parts of accelerator CZ, 1.1-1.3 parts of accelerator ETU, 4.8-5.2 parts of acid scavenger, 2.8-3.2 parts of antioxidant, 13-17 parts of plasticizer, 1.3-1.7 parts of dispersant, 1.5-2.5 parts of lubricant, and 2.0-3.0 parts of sodium stearate. The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber, and the chlorine content of the chlorohydrin rubber is 24-26%. The carbon black includes N550 carbon black and N339 carbon black, and the plasticizer includes plasticizer DOS and plasticizer TP759.

[0008] Furthermore, the mass ratio of carbon black N550 to carbon black N339 is 3:4.

[0009] Furthermore, the mass ratio of plasticizer DOS to plasticizer TP759 is 7:8.

[0010] Furthermore, the acid absorbent is hydrotalcite DHT-4A.

[0011] Furthermore, the lubricant is SRP66.

[0012] Furthermore, the antioxidant includes antioxidant NBC and antioxidant MB.

[0013] Furthermore, the dispersant is dispersant FL.

[0014] A second aspect of the present invention provides a method for preparing a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material, said preparation method being used to prepare the fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material described in any one of the claims, the preparation method comprising the following steps:

[0015] S1. Weigh the raw materials according to the mass fraction, add them to the internal mixer for thorough mixing, and filter to obtain the compounded rubber.

[0016] S2. The rubber compound is hot-mixed and homogenized using a two-roll mill, then sheeted to obtain rubber sheets, which are then vulcanized to obtain the final product.

[0017] Furthermore, in step S2, the vulcanization treatment includes the following steps: placing the rubber sheet in a flat vulcanizing press, under a pressure of 150~190 kgf / cm². 2 The product is vulcanized at 170-180℃ for 300-600 seconds, and then placed in a hot air oven for a second treatment at 130-160℃ for 2-5 hours.

[0018] Furthermore, in step S1, the mixing temperature is 110~130℃, and the mixing time is 3~6min.

[0019] This invention proposes a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material and its preparation method. Compared with the prior art, the fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material and its preparation method of this invention have the following beneficial effects:

[0020] The present invention discloses a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material. Without adding homopolymer chlorohydrin rubber, the various components of the raw material of the chlorohydrin rubber material are interconnected and work together to simultaneously achieve a Democcia fatigue life of over 600,000 cycles, a low-temperature brittleness temperature as low as -45°C, and a nitrogen permeability ≤30cm². 3 / m 2 With a strength of ×24h and 0.1MPa, it achieves a synergistic unity of three key performance characteristics, solving the problem of sealing failure of gas-sealed diaphragm products in high-latitude and extremely cold regions. It is particularly suitable for energy storage diaphragm products in new energy vehicles and industrial fields where safety and durability requirements are high. Attached Figure Description

[0021] Figure 1 This is a long-term compression deformation curve of a chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability as described in Embodiment 1 of the present invention. Detailed Implementation

[0022] To make the technical means and objectives and effects of the present invention easier to understand, the embodiments of the present invention will be described in detail below with reference to specific illustrations.

[0023] In the existing technology, chlorohydrin rubber materials, without the addition of homopolymer raw rubber, cannot simultaneously meet the requirements of high fatigue resistance, excellent low temperature resistance, and low air permeability, and therefore cannot be used in energy storage membrane products in the fields of new energy vehicles and industry.

[0024] To address the aforementioned technical problems, the applicant proposes a chlorohydrin rubber material with fatigue resistance, low-temperature resistance, and low air permeability. The raw materials of the chlorohydrin rubber material, by weight, include 95-105 parts of chlorohydrin rubber, 33-37 parts of carbon black, 0.29-0.31 parts of sulfur, 0.9-1.1 parts of accelerator CZ, 1.1-1.3 parts of accelerator ETU, 4.8-5.2 parts of acid scavenger, 2.8-3.2 parts of antioxidant, 13-17 parts of plasticizer, 1.3-1.7 parts of dispersant, 1.5-2.5 parts of lubricant, and 2.0-3.0 parts of sodium stearate. The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber with a chlorine content of 24-26%. The carbon black includes N550 carbon black and N339 carbon black, and the plasticizer includes DOS plasticizer and TP759 plasticizer.

[0025] Specifically, the mass ratio of carbon black N550 to carbon black N339 is 3:4.

[0026] Carbon black N550 and carbon black N339 are blended at this mass ratio to construct a filler network with high fatigue resistance and low air permeability, which can simultaneously achieve high fatigue life and air permeability resistance.

[0027] Specifically, the mass ratio of plasticizer DOS to plasticizer TP759 is 7:8.

[0028] When plasticizers DOS and TP759 were compounded at this mass ratio, it was unexpectedly found that while maintaining excellent low-temperature performance (brittle temperature ≤ -45℃), the nitrogen permeability decreased instead of increasing, meeting the requirement of ≤30cm³ / (m²×24h×0.1MPa), achieving a "1+1>2" effect. This may be because plasticizers DOS and TP759 form a synergistic plasticizing effect in chlorohydrin rubber, optimizing the molecular chain stacking density and inhibiting plasticizer migration, thereby improving the material density while maintaining flexibility.

[0029] Specifically, the acid absorbent is hydrotalcite DHT-4A.

[0030] Hydrotalcite is used as a highly efficient acid acceptor to neutralize hydrogen chloride generated during sulfidation and dynamic processes, preventing the main chain from "reverting" and breaking, and improving the stability of fatigue life.

[0031] Specifically, the lubricant is SRP66.

[0032] Specifically, the antioxidants include antioxidant NBC and antioxidant MB.

[0033] Specifically, the dispersant is dispersant FL.

[0034] The present invention discloses a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material. Without adding homopolymer chlorohydrin rubber, the various components of the raw material of the chlorohydrin rubber material are interconnected and work together, representing a systematic and synergistic innovation.

[0035] 1. Raw Rubber System: The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer, with a chlorine content of 25% and a Mooney viscosity (ML(1+4)) of 65 at 100℃. The low chlorine content and low polarity of the chlorohydrin rubber result in excellent low-temperature flexibility of its molecular chains. The glass transition temperature (Tg) of the raw rubber is close to -45℃, ensuring excellent low-temperature performance of the matrix material.

[0036] 2. Reinforcing System: The main function of carbon black in this invention is to improve air tightness and fatigue resistance. A carbon black system composed of N550 and N339 is selected to construct a filler network with high fatigue resistance and low air permeability. N550 carbon black has good flowability, avoiding localized stress concentration caused by filler aggregation, which is beneficial for improving fatigue life, but its air permeability resistance is poor. N339 carbon black has high structure, which can form strong chemical and physical adsorption with rubber molecular chains, helping to compensate for the poor air tightness of the binary copolymer ECO, but its fatigue heat generation is high, which is not conducive to improving fatigue life. By compounding carbon black N550 and N339, a filler network with high fatigue resistance and low air permeability is constructed, achieving both high fatigue life and air permeability resistance simultaneously.

[0037] 3. Vulcanization System: The role of the vulcanizing agent is to induce a cross-linking reaction in the rubber, transforming it from a linear structure to a network structure. This invention preferably uses a composite vulcanization system of accelerator ETU + hydrotalcite + sulfur + accelerator CZ. Hydrotalcite DHT-4A acts as an acid scavenger, improving the tear strength and fatigue crack resistance of the rubber compound. Simultaneously, it neutralizes the trace amounts of hydrochloric acid generated during the cross-linking process, mitigating mold contamination and corrosion. The composite accelerator system of sulfur S + accelerator CZ + accelerator ETU constructs a cross-linked network dominated by polysulfide bonds and mixed cross-linking bonds, imparting good dynamic flexibility to the material and ensuring high fatigue life and good heat resistance.

[0038] 4. Plasticizing System: The main function of rubber plasticizers is to lower the Tg of chlorohydrin rubber and improve its resilience and low-temperature flexibility. However, plasticizers enter the intermolecule gaps in rubber, reducing cross-linking bond formation, lowering the density of the cross-linking network, and increasing the sliding ability of molecular chains, which usually leads to a decrease in the gas tightness of the vulcanized rubber. Chlorohydrin rubber typically uses ester plasticizers with good compatibility with the rubber matrix. This invention uses a compound system of plasticizers DOS and TP759. Both DOS and TP759 are ester plasticizers with good compatibility with the rubber matrix. Plasticizer TP759 has a high flash point and good heat resistance, tear resistance, and pull-out resistance, while plasticizer DOS has a small molecular weight and good low-temperature resistance, but poor pull-out resistance. Using plasticizer DOS or plasticizer TP759 alone will reduce air tightness. However, by compounding plasticizers DOS and TP759 in a certain proportion, it was unexpectedly found that while maintaining excellent low-temperature performance (brittle temperature ≤ -45℃), the nitrogen permeability decreased instead of increasing, meeting the requirement of ≤30cm³ / (m²×24h×0.1MPa), achieving a "1+1>2" effect. This may be because plasticizers DOS and TP759 form a synergistic plasticizing effect in chlorohydrin rubber, optimizing the molecular chain stacking density and inhibiting plasticizer migration, thereby improving the material density while maintaining flexibility.

[0039] 5. Protection System: The main function of antioxidants is to improve the resistance of rubber compounds to heat and oxygen aging. Combining two or more antioxidants can produce a synergistic effect. When two antioxidants with different activities are used together, the highly active antioxidant donates hydrogen atoms to capture free radicals and terminate the aging chain reaction. The less active antioxidant can provide hydrogen atoms to the highly active antioxidant, allowing the chain termination reaction to continue. This invention uses antioxidants NBC and MB in combination. Antioxidant NBC has excellent protective effects against heat and oxygen damage, flexural cracking, etc., mitigating performance deterioration caused by the breakage of cross-links at stress points during material fatigue. Heterocyclic antioxidant MB is a non-polluting antioxidant that can improve the elongation retention rate of vulcanizates after heat aging and also improve the tear resistance of the rubber compound. The combined use of antioxidants NBC and MB creates a synergistic effect, improving the heat resistance and tear resistance of vulcanizates, and enhancing their fatigue resistance.

[0040] In summary, this invention, through the synergistic design of specific raw material formulations, successfully produced a chlorohydrin rubber material with high fatigue resistance (Demosia fatigue ≥ 600,000 cycles), excellent low-temperature resistance (brittle temperature ≤ -45℃), and low gas permeability (nitrogen permeability ≤ 30cm³ / (m²×24h×0.1MPa)) without the addition of homopolymer chlorohydrin rubber. This solves the problem of sealing failure and fatigue cracking of gas-sealing diaphragm products in high-latitude and extremely cold regions, and can be successfully applied to high-performance dynamic sealing products such as energy storage diaphragms for new energy vehicles.

[0041] A second aspect of the present invention provides a method for preparing a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material, said preparation method being used to prepare the fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material described in any one of the claims, the preparation method comprising the following steps:

[0042] S1. Weigh the raw materials according to the mass fraction, add them to the internal mixer for thorough mixing, and filter to obtain the compounded rubber.

[0043] S2. The rubber compound is hot-mixed and homogenized using a two-roll mill, then sheeted to obtain rubber sheets, which are then vulcanized to obtain the final product.

[0044] Specifically, in step S2, the vulcanization treatment includes the following steps: placing the rubber sheet in a flat vulcanizing press, and applying a pressure of 150~190 kgf / cm². 2 The product is vulcanized at 170-180℃ for 300-600 seconds, and then placed in a hot air oven for a second treatment at 130-160℃ for 2-5 hours.

[0045] Specifically, in step S1, the mixing temperature is 110~130℃ and the mixing time is 3~6 minutes.

[0046] The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0047] Example 1

[0048] This embodiment proposes a chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability. The raw materials of the chlorohydrin rubber material include, by weight, 100 parts of chlorohydrin rubber, 35 parts of carbon black, 0.3 parts of sulfur, 1 part of accelerator CZ, 1.2 parts of accelerator ETU, 5.0 parts of acid scavenger, 3 parts of antioxidant, 15 parts of plasticizer, 1.5 parts of dispersant, 2 parts of lubricant, and 2.5 parts of sodium stearate. The chlorohydrin rubber is a binary copolymer with a chlorine content of 25%. The carbon black includes N550 carbon black and N339 carbon black. The plasticizer includes plasticizer DOS and plasticizer TP759.

[0049] More specifically, the chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber, the grade of the chlorohydrin rubber is ECO C of EP / EO copolymer, the Mooney viscosity ML(1+4) at 100°C is 65; the manufacturer of the chlorohydrin rubber is Daisaku Corporation of Japan.

[0050] Specifically, the mass ratio of carbon black N550 to carbon black N339 is 3:4.

[0051] More specifically, in this embodiment, the carbon black N550 is 15 parts and the carbon black N339 is 20 parts.

[0052] Specifically, the mass ratio of plasticizer DOS to plasticizer TP759 is 7:8.

[0053] More specifically, in this embodiment, the plasticizer DOS is 7 parts and the plasticizer TP759 is 8 parts.

[0054] Specifically, the acid absorbent is hydrotalcite DHT-4A.

[0055] Specifically, the lubricant is SRP66.

[0056] Specifically, the antioxidants include antioxidant NBC and antioxidant MB.

[0057] More specifically, in this embodiment, the mass ratio of antioxidant NBC to antioxidant MB is 1:2, with NBC comprising 1 part and MB comprising 2 parts.

[0058] Specifically, the dispersant is dispersant FL.

[0059] The preparation method of the fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material includes the following steps:

[0060] S1. Weigh the raw materials according to the mass fraction, add them to the internal mixer for thorough mixing, and filter to obtain the compounded rubber.

[0061] S2. The rubber compound is hot-mixed and homogenized using a two-roll mill, then sheeted to obtain rubber sheets, which are then vulcanized to obtain the final product.

[0062] In step S1, the mixing temperature is 120℃ and the mixing time is 5 minutes.

[0063] In step S2, the vulcanization treatment includes the following steps: placing the rubber sheet in a flat vulcanizing press, under a pressure of 170 kgf / cm². 2 The product is vulcanized at 175℃ for 420 seconds, and then placed in a hot air oven for a second treatment at 145℃ for 3.5 hours.

[0064] Example 2

[0065] In this embodiment, unlike in Embodiment 1, the mass ratio of antioxidant NBC to antioxidant MB is 2:1, with 2 parts of antioxidant NBC and 1 part of antioxidant MB.

[0066] The raw materials of the chlorohydrin rubber material include, by weight, 102 parts of chlorohydrin rubber, 35 parts of carbon black, 0.3 parts of sulfur, 0.9 parts of accelerator CZ, 1.3 parts of accelerator ETU, 5.1 parts of acid absorber, 3 parts of antioxidant, 15 parts of plasticizer, 1.3 parts of dispersant, 1.5 parts of lubricant, and 2.0 parts of sodium stearate.

[0067] Comparative Example 1

[0068] In this comparative example, unlike Example 1, the chlorohydrin rubber is a homopolymer and the chlorine content is 37%.

[0069] Specifically, the chlorohydrin rubber is an epichlorohydrin homopolymer, the grade of the chlorohydrin rubber is ECO H of EP homopolymer, and the Mooney viscosity ML(1+4) of the chlorohydrin rubber at 100°C is 55.

[0070] Comparative Example 2

[0071] In this comparative example, unlike Example 1, the chlorohydrin rubber is a homopolymer and the chlorine content is 37%.

[0072] Specifically, the chlorohydrin rubber is an epichlorohydrin homopolymer, the grade of the chlorohydrin rubber is ECO H of EP homopolymer, and the Mooney viscosity ML(1+4) of the chlorohydrin rubber at 100°C is 55.

[0073] Specifically, in this comparative example, the plasticizers included only DOS, and not TP759.

[0074] Comparative Example 3

[0075] In this comparative example, unlike Example 1, the carbon black only includes carbon black N550 and does not include carbon black N339.

[0076] Comparative Example 4

[0077] In this comparative example, unlike Example 1, the carbon black only includes carbon black N339 and does not include carbon black N550.

[0078] Comparative Example 5

[0079] In this comparative example, unlike Example 1, the raw materials do not contain sulfur and accelerator CZ.

[0080] Comparative Example 6

[0081] In this comparative example, unlike Example 1, the antioxidant is 1 part, and the antioxidant only includes antioxidant NBC and does not include antioxidant MB.

[0082] Comparative Example 7

[0083] In this comparative example, unlike Example 1, there are 2 parts of antioxidant, and the antioxidant only includes antioxidant MB and does not include antioxidant NBC.

[0084] Comparative Example 8

[0085] In this comparative example, unlike Example 1, the plasticizer only includes plasticizer DOS and does not include plasticizer TP759.

[0086] Comparative Example 9

[0087] In this comparative example, unlike Example 1, the plasticizer only includes plasticizer TP759 and does not include plasticizer DOS.

[0088] Comparative Example 10

[0089] In this comparative example, unlike in Example 1, the accelerator ETU was 2.0 parts.

[0090] The specific formulations of the rubber materials in Examples 1-2 and Comparative Examples 1-10 are shown in Table 1:

[0091] Table 1 Raw material formulation of rubber materials

[0092]

[0093] Performance testing

[0094] The rubber materials obtained in Examples 1-2 and Comparative Examples 1-10 were subjected to physical property tests. Hardness testing was conducted according to GB / T 531 standard, tensile strength and elongation at break testing according to GB / T 528 standard, brittle temperature testing according to GB / T 15256 standard, nitrogen permeability testing according to GB / T 7755.1 standard, and Demosia flexural strength testing according to GB / T 13934 standard. The test results are shown in Table 2.

[0095] Table 2 Performance test results of rubber materials

[0096]

[0097] Hardness is used to evaluate the ability of rubber products to resist external stress without changing shape; tensile strength and elongation at break are used to evaluate the mechanical and assembly properties of rubber products; brittle temperature is used to evaluate the low-temperature resistance limit of rubber products; Demosia flexure is used to evaluate the resistance of rubber products to dynamic crack formation, affecting product reliability; and nitrogen permeability is used to evaluate the gas sealing performance of rubber products. Therefore, to meet the long service life requirements of low-temperature dynamic seals, the performance standards of chlorohydrin rubber materials have been improved: hardness 65±5 degrees, tensile strength ≥10MPa, elongation at break ≥350%, Demosia fatigue ≥600,000 cycles, and nitrogen permeability ≤30cm.3 / (m 2 (×24h×0.1MPa), brittle temperature ≤-45℃.

[0098] As can be seen from the experimental data of Examples 1-2 and Comparative Examples 1-10 in Table 2, the rubber materials prepared in Examples 1-2 of this invention have excellent properties, with a hardness of 65±5 degrees, tensile strength ≥10MPa, elongation at break ≥380%, Demosia fatigue resistance ≥650,000 cycles, and nitrogen permeability ≤30cm. 3 / (m 2 (×24h×0.1MPa), brittle temperature ≤-45℃. Therefore, the rubber materials prepared in Examples 1-2 of this invention have excellent properties, low brittle temperature, high tensile strength and elongation at break, low nitrogen permeability, and high fatigue life, fully meeting the requirements for low-temperature resistant rubber sealing materials.

[0099] To verify the low-temperature fatigue resistance of chlorohydrin rubber, the rubber material prepared in Example 1 was subjected to flexural life tests at different frequencies to evaluate the lifespan of the sealing product. The test results are shown below. Figure 1 .

[0100] Depend on Figure 1 It can be seen that the rubber material prepared in Example 1 has a fatigue life of ≥600,000 cycles at a test frequency of 0.5~5 Hz.

[0101] In summary, it can be seen that the chlorohydrin rubber material prepared by this invention has fatigue resistance, low temperature resistance and low air permeability, which fully meets the requirements of dynamic sealing of diaphragm products. The product has a long service life and effectively solves the problem of sealing failure caused by fatigue cracking in this type of product. At the same time, it expands the application range of chlorohydrin rubber dynamic seals and has been successfully applied to products such as diaphragms for energy storage devices in new energy vehicles.

[0102] While the present invention has been disclosed above, it is not limited thereto. Any person skilled in the art can make various modifications and alterations without departing from the spirit and scope of the invention; therefore, the scope of protection of the present invention should be determined by the scope defined in the claims.

Claims

1. A chlorohydrin rubber material with fatigue resistance, low-temperature resistance, and low air permeability, characterized in that, The raw materials of the chlorohydrin rubber material include, by weight, 95-105 parts of chlorohydrin rubber, 33-37 parts of carbon black, 0.29-0.31 parts of sulfur, 0.9-1.1 parts of accelerator CZ, 1.1-1.3 parts of accelerator ETU, 4.8-5.2 parts of acid scavenger, 2.8-3.2 parts of antioxidant, 13-17 parts of plasticizer, 1.3-1.7 parts of dispersant, 1.5-2.5 parts of lubricant, and 2.0-3.0 parts of sodium stearate. The chlorohydrin rubber is an epichlorohydrin-ethylene oxide binary copolymer chlorohydrin rubber with a chlorine content of 24-26%. The carbon black includes N550 carbon black and N339 carbon black, and the plasticizer includes plasticizer DOS and plasticizer TP759.

2. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The mass ratio of carbon black N550 to carbon black N339 is 3:

4.

3. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The mass ratio of plasticizer DOS to plasticizer TP759 is 7:

8.

4. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The acid absorbent is hydrotalcite DHT-4A.

5. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The lubricant is SRP66.

6. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The antioxidants include antioxidant NBC and antioxidant MB.

7. The chlorohydrin rubber material with fatigue resistance, low temperature resistance, and low air permeability according to claim 1, characterized in that, The dispersant is dispersant FL.

8. A method for preparing a chlorohydrin rubber material with fatigue resistance, low-temperature resistance, and low air permeability, characterized in that, The preparation method is used to prepare a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material according to any one of claims 1 to 7, and the preparation method includes the following steps: S1. Weigh the raw materials according to the mass fraction, add them to the internal mixer for thorough mixing, and filter to obtain the compounded rubber. S2. The rubber compound is hot-mixed and homogenized using a two-roll mill, then sheeted to obtain rubber sheets, which are then vulcanized to obtain the final product.

9. The method for preparing a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material according to claim 8, characterized in that, In step S2, the vulcanization treatment includes the following steps: placing the rubber sheet in a flat vulcanizing press, and applying a pressure of 150~190 kgf / cm². 2 The product is vulcanized at 170-180℃ for 300-600 seconds, and then placed in a hot air oven for a second treatment at 130-160℃ for 2-5 hours.

10. The method for preparing a fatigue-resistant, low-temperature-resistant, and low-permeability chlorohydrin rubber material according to claim 8, characterized in that, In step S1, the mixing temperature is 110~130℃ and the mixing time is 3~6min.

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