High-hardness high-definite-elongation rubber material and preparation method thereof

Abstract

The invention discloses a high-hardness high-definite-elongation rubber material and a preparation method thereof. The high-hardness high-definite-elongation rubber material comprises the following raw materials in percentage by weight: 33-38% of natural rubber, 8-14.5% of butadiene rubber, 40-45% of a reinforcing filler, 1-4% of a plasticizing softener, 2-4% of an active agent, 5-7% of other processing aids and 2-3% of a vulcanizing agent. After the formula is improved, the tensile strength, the elongation and the tensile strength at definite elongation of the rubber material are obviously improved, and the comprehensive performance of the rubber raw materials is greatly improved, so that the rubber material has wider application space in the automobile accessory industry, and great convenience is brought to the development of the raw materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber formulations, in particular to a high-hardness high-elongation rubber material and a preparation method thereof. BACKGROUND

[0002] Natural rubber has good elasticity, wear resistance and other advantages, with the development of the automobile industry, the conventional hardness of natural rubber is difficult to meet the application of some automobile parts or industrial sealing parts and the like. At present, the hardness of natural rubber is usually improved by increasing the amount of carbon black or other fillers, which also leads to the decline of other properties of the rubber, such as the body strength, processing difficulty and the like. Therefore, it is of great significance to develop a method for improving the hardness and elongation strength of natural rubber while maintaining its good comprehensive performance. SUMMARY

[0003] The present application aims to provide a high-hardness high-elongation rubber material and a preparation method thereof to solve the problems of poor tear resistance and high cost of existing automobile valve rubber materials in the background art.

[0004] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a high-hardness high-elongation rubber material, comprising raw materials in the following weight percentage: natural rubber 33%-38%, butadiene rubber 8%-14.5%, reinforcing filler 40%-45%, plastic softener 1%-4%, active agent 2%-4%, other processing aids 5%-7%, vulcanizing agent 2%-3%.

[0005] In some embodiments of the present application, the active agent is a mixture of zinc oxide and stearic acid in a weight ratio of 10:3.

[0006] In some embodiments of the present application, the other processing aids include paraffin, coumarone-indene resin, antioxidant.

[0007] In some embodiments of the present application, the reinforcing agent is high-wear-resistant carbon black and semi-reinforcing carbon black.

[0008] In some embodiments of the present application, the plasticizer is paraffin oil.

[0009] The present application also discloses a preparation method of a high-hardness high-elongation rubber material, and the specific steps are as follows: S1, open the pressurized rubber kneader, set the rotating speed: 30 rpm, plasticize the natural rubber in the above-mentioned formula to a plasticized rubber with a Mooney value of 60 (test method: ML1+4 100℃), cool and wait for use, the plasticizing time is 12 minutes; S2, give the internal mixer water cooling, control the temperature of the working chamber < 120 DEG C, the plastic after the natural rubber, butadiene rubber into the internal mixer, internal mixing, internal mixing time 1 minute, then the active agent, plasticizer, reinforcing agent, into the internal mixer, internal mixing, internal mixing time 10-11 minutes, the glue temperature control in 120 DEG C below discharge, then on the open mill sheet, cooling to obtain the masterbatch; S3, open mill cooling, the drum spacing is adjusted to the scale 2, control the open mill drum temperature < 70 DEG C, the masterbatch is put into the open mill, uniformly add the curing agent mixing, 3 minutes, the drum spacing is adjusted to 0 scale, the glue thin pass 3 times, then on the open mill sheet, placed in a constant temperature refrigerator for 24 hours or more, namely obtain high strength rubber material.

[0010] Compared with the prior art, the beneficial effects of the present application are: the formula of the present application is improved, the rubber material has obvious improvement in tensile strength, elongation, and modulus, the comprehensive performance of the rubber raw material is greatly improved, which makes it have more broad application space in the automotive industry, and brings great convenience to the development of raw materials. DETAILED DESCRIPTION

[0011] The following is a clear and complete description of the technical solutions in the embodiments of the present application, based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative labor belong to the scope of protection of the present application.

[0012] In addition, the terms "first", "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include one or more features. In the description of the present application, the meaning of "multiple" is two or more, unless otherwise specifically limited.

[0013] Example 1 The high hardness high modulus rubber material disclosed in the present example comprises raw materials in the following weight percentage: natural rubber 33%-38%, butadiene rubber 8%-14.5%, reinforcing filler 40%-45%, plasticizer 1%-4%, active agent 2%-4%, other processing aids 5%-7%, curing agent 2%-3%.

[0014] In some embodiments of the present application, the activator is a mixture of zinc oxide and stearic acid in a weight ratio of 10:3.

[0015] In some embodiments of the present application, the other processing aids include 2.5% by weight of the raw materials wax, 1.3% of coumarone-indene resin, 2% of antioxidant.

[0016] In some embodiments of the present application, the plasticizer is paraffin oil.

[0017] The present application also discloses a preparation method of high hardness and high elongation rubber material, and the specific steps are as follows: S1, open the pressurized rubber kneader, set the rotating speed: 30 rpm, plasticize the natural rubber in the above formula to a plasticized rubber with a Mooney value of 60 (test method: ML1+4 100℃), cool and wait for use, the plasticizing time is 12 minutes; S2, cool the internal mixer, control the temperature of the working chamber to be less than 120℃, put the plasticized natural rubber and butadiene rubber into the internal mixer, mix for 1 minute, then put the active agent, plasticizing softening agent, reinforcing agent in the formula into the internal mixer, mix for 10-11 minutes, control the rubber temperature to be less than 120℃, then discharge the rubber, and obtain the masterbatch by sheeting on the open mill and cooling; S3, cool the open mill, adjust the roller spacing to scale 2, control the roller temperature of the open mill to be less than 70℃, put the masterbatch into the open mill, mix uniformly by adding the curing agent in the formula, the mixing time is 3 minutes, adjust the roller spacing to scale 0, pass the rubber through the open mill for 3 times, then sheet on the open mill, place in a constant-temperature cold storage for more than 24 hours, and obtain the high-strength tire belt rubber material.

[0018] In the embodiment, the high hardness and high elongation rubber material is mainly prepared from the following raw materials by weight percentage: mainly prepared from the following raw materials by weight percentage: Natural rubber: 34.9%, butadiene rubber: 8.73%; Reinforcing filler: high wear-resistant carbon black: 28.36%, natural gas semi-reinforcing carbon black: 15.27%; Plasticizing softening agent: 1.75% Active agent: 2.83%.

[0019] Other processing aids: 2.62% of microcrystalline wax and paraffin wax, 1.31% of coumarone-indene resin, 1.95% of antioxidant.

[0020] Curing agent: 1.31% of sulfur masterbatch, 0.83% of N-cyclohexyl-2-benzothiazole sulfenamide and dithiodibenzothiazole in a weight ratio of 18:1, and 0.14% of anti-scorching agent CTP.

[0021] Example 2 This example discloses a high-hardness, high-elongation rubber material, comprising raw materials in the following weight percentages: Natural rubber: 33.18%, butadiene rubber: 14.22%; Reinforcing fillers: High abrasion-resistant carbon black: 25.6%, semi-reinforcing carbon black: 14.22%, and 1.9% silica; Plasticizer: 1.9% Surfactant: 3.08%.

[0022] Other processing aids: 0.95% microcrystalline wax, 0.95% coumarone indene resin, 1.65% antioxidant.

[0023] Vulcanizing agent: 1.07% sulfur masterbatch, and 0.9% N-cyclohexyl-2-benzothiazole sulfenamide and dithiodibenzothiazole in a mixture of the two in a weight ratio of (15:4), 0.24% tetramethylthiuram disulfide, and 0.14% scorching inhibitor CTP.

[0024] Preparation method: Same as the preparation method in Example 1 above. Comparative Example 1 Existing high-hardness rubber materials and their preparation methods are mainly prepared from the following raw materials by weight percentage: Rubber raw materials: Natural rubber: 32.61%, Styrene-butadiene rubber 1502: 13.98% Fillers: High abrasion-resistant carbon black: 32.61%, silica: 4.66% Plasticizer: 3.73% Surfactant: 3.27%.

[0025] Other additives: 2.33% C5 resin, 2.56% antioxidant, 1.4% dispersant, and 0.47% microcrystalline wax.

[0026] Vulcanizing agent: 0.7% sulfur powder, and a mixture of 1.47% N-cyclohexyl-2-benzothiazole sulfenamide, tetramethylthiuram disulfide, and tetramethylthiuram disulfide in a weight ratio of (10:10:1), and 0.23% HVA-2 The preparation process steps are as follows: Turn on the pressure rubber kneading mill and set the speed to 32 rpm. Plasticize the natural rubber in the above formula until the Mooney score is 60. Cool the plasticized rubber for 12 minutes. Cool the internal mixer with water and control the working chamber temperature to <120℃. Put the plasticized natural rubber and butadiene rubber into the internal mixer and mix for 1 minute. Then, put the activator, plasticizer, and reinforcing agent in the formula into the internal mixer and mix for 10-11 minutes. Control the rubber temperature to below 120℃ and discharge the rubber. Then, sheet the rubber on an open mixing mill and cool it to obtain the masterbatch. The open mill is cooled by water. The roller spacing is adjusted to mark 2, and the roller temperature is controlled to be below 70℃. The masterbatch is added to the open mill, and the vulcanizing agent in the formula is added evenly and mixed for 3 minutes. The roller spacing is then adjusted to mark 0, and the rubber compound is passed through the mill three times. The mixture is then sheeted out on the open mill and placed in a constant-temperature cold storage for at least 24 hours to obtain the tire rubber material.

[0027] Comparative Example 2 Existing high-hardness rubber materials and their preparation methods are mainly prepared from the following raw materials by weight percentage: Rubber raw materials: Natural rubber: 38.89%, Butadiene rubber: 9.72% Fillers: High abrasion-resistant carbon black: 37.92%, silica: 2.43% Plasticizer: 1.94% Surfactant: 3.16%.

[0028] Other additives: 1.95% antioxidant, 0.97% microcrystalline wax, 0.73% methyl methacrylate (MMA).

[0029] Vulcanizing agent: 1.36% sulfur powder masterbatch, and 0.78% N-cyclohexyl-2-benzothiazole sulfenamide and 2-thiol benzothiazole in a weight ratio of (7:1), and 0.15% scorching inhibitor CTP.

[0030] Preparation method: Same as comparative example 1 Table 1 shows the experimental data for high-hardness, high-elongation rubber material products obtained through experiments. The results in Table 1 above show that the formulations used in Examples 1 and 2 have significant improvements in tensile strength, elongation, and tensile strength at a given elongation, greatly improving the overall performance of the rubber raw materials and making their application scenarios more diversified.

[0031] Therefore, after the formulation improvement of this invention, the rubber material has significant improvements in tensile strength, elongation, and tensile strength at a given elongation. The comprehensive performance of the rubber raw material has been greatly improved, which gives it a wider range of applications in the auto parts industry and brings great convenience to the development of raw materials.

[0032] Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A high-hardness, high-elongation rubber material, characterized in that: It includes raw materials in the following weight percentages: natural rubber 33%-38%, butadiene rubber 8%-14.5%, reinforcing filler 40%-45%, plasticizer softener 1%-4%, activator 2%-4%, other processing aids 5%-7%, and vulcanizing agent 2%-3%.

2. The high-hardness, high-elongation rubber material according to claim 1, characterized in that: The activator is a mixture of zinc oxide and stearic acid in a weight ratio of 10:

3.

3. The high-hardness, high-elongation rubber material according to claim 1, characterized in that: Other processing aids include paraffin wax, coumarone-indene resin, and antioxidants.

4. The high-hardness, high-elongation rubber material according to claim 1, characterized in that: The plasticizer is paraffin oil.

5. A method for preparing a high-hardness, high-elongation rubber material, characterized in that, The specific steps are as follows: S1. Turn on the pressure rubber kneader and set the speed to 30 rpm. Plasticize the natural rubber in the above formula until the Mooney score is 60. Cool the plasticized rubber for later use. The plasticizing time is 12 minutes. S2. Cool the internal mixer with water and control the working chamber temperature to <120℃. Put the plasticized natural rubber and butadiene rubber into the internal mixer and mix for 1 minute. Then, put the activator, plasticizer, and reinforcing agent in the formula into the internal mixer and mix for 10-11 minutes. Control the rubber temperature to below 120℃ and discharge the rubber. Then, sheet the rubber on an open mixing mill and cool it to obtain the masterbatch. S3. Cool the open mill with water, adjust the roller spacing to scale 2, control the open mill roller temperature to <70℃, put the masterbatch into the open mill, add the vulcanizing agent in the formula evenly and mix for 3 minutes, adjust the roller spacing to scale 0, pass the rubber compound through the open mill 3 times, then sheet it on the open mill and place it in a constant temperature cold storage for more than 24 hours to obtain high-strength tire rubber material.

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