Tread rubber formula for improving aging resistance of rubber product and application

Abstract

The invention discloses a tread rubber formula for improving the anti-aging performance of rubber products and application, and belongs to the technical field of tire manufacturing, and the tread rubber formula comprises the following substances: natural rubber, styrene butadiene rubber, butadiene rubber, common white carbon black, a novel heavy environment-friendly plasticizer, a silane coupling agent, carbon black, an anti-aging agent, stearic acid, an activator ZnO, cashew nut shell oil and sulfur. An accelerator and other components. On the basis of an existing tread rubber formula, a novel heavy environment-friendly plasticizer obtained through an environment-friendly process is added, traditional environment-friendly aromatic hydrocarbon oil is replaced with cashew nut shell oil, the proportion of all components is optimized, and manufacturing and application of the formula 1 and the formula 2 are improved. The formula system of the tread rubber not only has excellent oxidation resistance, but also can effectively inhibit the rubber from being degraded by ozone and ultraviolet rays to achieve an anti-aging effect, and also can improve the ozone cracking resistance of a rubber product, improve the durability of a tire and prolong the service life of the tire by 6-12%.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of tire manufacturing, in particular to a tread rubber formula for improving the anti-aging performance of rubber products and application. BACKGROUND

[0002] At present, the rubber plasticizer in the tire industry is mainly based on petroleum, such as aromatic oil, naphthenic oil and paraffin oil, etc. However, this kind of plasticizer depends on fossil raw materials, which does not meet the trend of sustainable development; and contains benzene, toluene, xylene and polycyclic aromatic hydrocarbons (PAHs), etc., which may cause the surface of the tire to be colored and discolored, and harm human health; and may accelerate the aging of rubber under long-term exposure to ozone and ultraviolet light.

[0003] Although the tire industry upgrades the process to purify petroleum-based (such as aromatic oil and alkane oil) into environmentally friendly aromatic oil, which reduces some harmful ingredients, but its raw materials and production process still cannot completely get rid of the dependence on fossil resources, and still has certain environmental problems.

[0004] Therefore, the use of environmentally friendly natural oil becomes a more potential alternative. The bio-based product using cashew nut shell as raw material shows significant advantages: good environmental performance, containing natural antioxidant ingredients, which can effectively delay the aging of rubber and prolong the service life of the tire; at the same time, it has good compatibility with most rubbers, long storage period, and broad application prospect. SUMMARY

[0005] Therefore, the present application provides a tread rubber formula for improving the anti-aging performance of rubber products and application, by adding a new type of heavy environmentally friendly plasticizer obtained by dehydrating and degassing, and secondary solvent extraction from heavy base oil in the refinery, and replacing the traditional environmentally friendly aromatic oil with cashew nut shell oil containing antioxidant ingredients, so that the tread rubber formula system not only has excellent antioxidant properties, but also improves the durability of the tire, thereby prolonging its service life.

[0006] In order to achieve the above purpose, the present application provides the following technical scheme: According to the first aspect of the present application, a tread rubber formula for improving the anti-aging performance of rubber products is provided, which is composed of natural rubber, styrene-butadiene rubber, butadiene rubber, ordinary white carbon black, coupling agent, carbon black, stearic acid, activator, new type of heavy environmentally friendly plasticizer, antioxidant, processing oil, vulcanizing agent, accelerator and other ingredients.

[0007] Further, the new type of heavy environmentally friendly plasticizer is made of heavy base oil in the refinery, and is obtained by dehydrating and degassing, and secondary solvent extraction.

[0008] Further, the coupling agent is a silane coupling agent.

[0009] Further, the activator is zinc oxide.

[0010] Further, the processing oil is cashew nut shell liquid.

[0011] Further, the vulcanizing agent is sulfur.

[0012] Further, the filler dispersant and the paraffin wax.

[0013] Further, the substances are counted by weight parts, including 5-10 parts of natural rubber, 70-80 parts of styrene-butadiene rubber, 15-20 parts of cis-butadiene rubber, 70-90 parts of ordinary white carbon black, 7-9 parts of silane coupling agent, 6-9 parts of carbon black, 1.5-2 parts of stearic acid, 2-3 parts of activator ZnO, 3-5 parts of new heavy environmental protection plasticizer, 4.5-6 parts of antioxidant, 3-5 parts of cashew nut shell liquid, 1.5-2.5 parts of sulfur, 2-4 parts of accelerator and 4-8 parts of filler dispersant and paraffin wax.

[0014] Further, the substances are counted by weight parts, including 5-10 parts of natural rubber, 70-80 parts of styrene-butadiene rubber, 15-20 parts of cis-butadiene rubber, 70-90 parts of ordinary white carbon black, 7-9 parts of silane coupling agent, 6-9 parts of carbon black, 1.5-2 parts of stearic acid, 2-3 parts of activator ZnO, 4-6 parts of new heavy environmental protection plasticizer, 6-7.5 parts of antioxidant, 2-4 parts of cashew nut shell liquid, 1.5-2.5 parts of sulfur, 2-4 parts of accelerator and 4-8 parts of filler dispersant and paraffin wax.

[0015] According to the second aspect of the present application, a process for preparing a tread rubber for improving the anti-aging performance of a rubber product is provided, comprising the following steps: (1) One-stage mixing Lifting the top pin, adding natural rubber, styrene-butadiene rubber and cis-butadiene rubber at the speed of 50 rpm, mixing for 30 s; lifting the top pin, adjusting the speed of the internal mixer to 45 rpm, adding 80% ordinary white carbon black and silane coupling agent; lifting the top pin, when the temperature of the internal mixer rises to 95 ℃, adjusting the speed to 40 rpm, adding 100% carbon black; lifting the top pin, when the temperature of the internal mixer rises to 110 ℃, keeping the speed unchanged, adding 80% stearic acid, activator ZnO, new heavy environmental protection plasticizer, antioxidant, cashew nut shell liquid and filler dispersant and paraffin wax; lifting the top pin, when the temperature of the internal mixer rises to 120 ℃, adjusting the speed to 35 rpm, cleaning; lifting the top pin, when the temperature of the internal mixer rises to 130 ℃, adjusting the speed to 20 rpm, keeping the temperature for 80 s; when the temperature of the internal mixer rises to 140 ℃, opening the discharge door to discharge the rubber; (2) Two-stage mixing Lifting the top pin, when the speed of the internal mixer is 45 rpm, add a section of mixing rubber, mixing 30s; lifting the top pin, adjust the speed of the internal mixer to 40 rpm, add the remaining 20% ordinary white carbon black and silane coupling agent; lifting the top pin, when the temperature of the internal mixer rises to 105℃, adjust the speed to 35 rpm, add the remaining 20% stearic acid, activator ZnO, new heavy environmental protection plasticizer, antioxidant, cashew nut shell oil and filler dispersant and paraffin wax; lifting the top pin, when the temperature of the internal mixer rises to 115℃, adjust the speed to 30 rpm, clean; lifting the top pin, when the temperature of the internal mixer rises to 125℃, adjust the speed to 20 rpm, constant temperature rubber 40s; when the temperature of the internal mixer rises to 135℃, open the discharge door to discharge the glue; (3) Final refining Lifting the top pin, when the speed of the internal mixer is 30 rpm, add a section of mixing rubber, mixing 30s; lifting the top pin, adjust the speed of the internal mixer to 30 rpm, clean; when the temperature of the internal mixer rises to 100℃, open the discharge door to discharge the glue.

[0016] The present application has the following advantages: The present application provides a kind of reducing tire rolling resistance tread rubber formula. First, we use the heavy base oil in refinery as raw material, through dewatering and degassing, secondary solvent extraction develops a new heavy environmental protection plasticizer. The plasticizer can use the super strong solubility of formula solvent to polycyclic aromatic hydrocarbon, under certain temperature, pressure and time, the polycyclic aromatic hydrocarbon (PAHs) content in raw oil is reduced to less than 10 ppm, to meet the EU standard. Add the new heavy environmental protection plasticizer in the existing tread rubber formula, and replace the traditional environmental aromatic oil with cashew nut shell oil containing antioxidant ingredients, while increasing the amount of new heavy environmental protection plasticizer and antioxidant. Through this formula improvement, the tread rubber formula system not only has excellent antioxidant property, can effectively inhibit the degradation of rubber caused by ozone and ultraviolet, achieve the effect of anti-aging, but also can improve the ozone cracking resistance of rubber products, improve the durability of tire, thereby prolong its service life. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. Obviously, the drawings in the following description are only exemplary, and those skilled in the art can obtain other implementation drawings according to the provided drawings without creating any creative labor.

[0018] The structures, proportions, sizes, etc. shown in the specification are only used to cooperate with the content disclosed in the specification, to be understood and read by those skilled in the art, and are not used to limit the conditions that can be implemented by the application, so they do not have technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size, without affecting the effect and purpose that can be achieved by the application, should still fall within the scope of the technology disclosed by the application.

[0019] Figure 1 The tread rubber prepared in Example 1, Example 4 and Comparative Example 1 of the present application was placed in an environment with a temperature of 40°C, a relative humidity of 60%, and an ozone concentration of 50pphm for aging for 72h, and a surface cracking pattern comparison diagram is shown. DETAILED DESCRIPTION

[0020] The embodiments of the present application are described below by specific examples, and those skilled in the art can easily understand other advantages and effects of the present application from the content disclosed in the specification. Obviously, the described examples are part of the embodiments of the present application, not all. Based on the examples in the present application, all other examples obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0021] The use process of the embodiment of the present application is as follows: Example 1

[0022] A tread rubber formula for reducing tire rolling resistance, each substance is counted by weight parts, including 5 parts of natural rubber, 70 parts of butadiene styrene rubber, 15 parts of butadiene rubber, 70 parts of ordinary white carbon black, 7 parts of silane coupling agent, 6 parts of carbon black, 1.5 parts of stearic acid, 2 parts of activator ZnO, 3 parts of new heavy environmental protection plasticizer, 4.5 parts of antioxidant, 3 parts of cashew nut shell oil, 1.5 parts of sulfur, 2 parts of accelerator and 4 parts of filler dispersant and paraffin wax.

[0023] The preparation process of the tread rubber comprises the following steps: (1) One-stage mixing Lifting the top pin, the mixer speed at 50 rpm, add natural rubber, styrene butadiene rubber and butadiene rubber, mixing 30 s; lifting the top pin, the mixer speed adjusted to 45 rpm, add 80% ordinary white carbon black and silane coupling agent; lifting the top pin, when the mixer temperature rises to 95 ℃, the speed adjusted to 40 rpm, add 100% carbon black; lifting the top pin, when the mixer temperature rises to 110 ℃, the speed remains unchanged, add 80% stearic acid, activator ZnO, new heavy environmental plasticizer, antioxidant, cashew nut shell oil, and filler dispersant and paraffin; lifting the top pin, when the mixer temperature rises to 120 ℃, the speed adjusted to 35 rpm, cleaning; lifting the top pin, when the mixer temperature rises to 130 ℃, the speed adjusted to 20 rpm, constant temperature rubber 80 s; when the mixer temperature rises to 140 ℃, open the discharge door to discharge the glue; (2) Second mixing Lifting the top pin, the mixer speed at 45 rpm, add the first mixing rubber, mixing 30 s; lifting the top pin, the mixer speed adjusted to 40 rpm, add the remaining 20% ordinary white carbon black and silane coupling agent; lifting the top pin, when the mixer temperature rises to 105 ℃, the speed adjusted to 35 rpm, add the remaining 20% stearic acid, activator ZnO, new heavy environmental plasticizer, antioxidant, cashew nut shell oil, and filler dispersant and paraffin; lifting the top pin, when the mixer temperature rises to 115 ℃, the speed adjusted to 30 rpm, cleaning; lifting the top pin, when the mixer temperature rises to 125 ℃, the speed adjusted to 20 rpm, constant temperature rubber 40 s; when the mixer temperature rises to 135 ℃, open the discharge door to discharge the glue; (3) Final mixing Lifting the top pin, the mixer speed at 30 rpm, add the second mixing rubber, sulfur and accelerator, mixing 30 s; lifting the top pin, the mixer speed adjusted to 30 rpm, cleaning; when the mixer temperature rises to 100 ℃, open the discharge door to discharge the glue.

[0024] Example 2

[0025] The difference between Example 2 and Example 1 is that the amount of each substance in the tread rubber formula is counted by weight parts, including 7.5 parts of natural rubber, 75 parts of styrene butadiene rubber, 17.5 parts of butadiene rubber, 80 parts of ordinary white carbon black, 8 parts of silane coupling agent, 7.5 parts of carbon black, 1.7 parts of stearic acid, 2.5 parts of activator ZnO, 4 parts of new heavy environmental plasticizer, 5.3 parts of antioxidant, 4 parts of cashew nut shell oil, 2 parts of sulfur, 3 parts of accelerator, and 6 parts of filler dispersant and paraffin. The specific preparation method is the same as that of Example 1.

[0026] Example 3

[0027] Example 3 is different from Example 1 in that the amounts of each substance in the tread rubber formulation are counted by weight parts, including 10 parts of natural rubber, 80 parts of styrene-butadiene rubber, 20 parts of butadiene rubber, 90 parts of ordinary white carbon black, 9 parts of silane coupling agent, 9 parts of carbon black, 2 parts of stearic acid, 3 parts of activator ZnO, 5 parts of new heavy environmental protection plasticizer, 6 parts of antioxidant, 5 parts of cashew nut shell oil, 2.5 parts of sulfur, 4 parts of accelerator and 8 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0028] Example 4

[0029] Example 4 is different from Example 1 in that the amounts of new heavy environmental protection plasticizer and antioxidant are increased; the amounts of each substance in the tread rubber formulation are counted by weight parts, including 5 parts of natural rubber, 70 parts of styrene-butadiene rubber, 15 parts of butadiene rubber, 70 parts of ordinary white carbon black, 7 parts of silane coupling agent, 6 parts of carbon black, 1.5 parts of stearic acid, 2 parts of activator ZnO, 4 parts of new heavy environmental protection plasticizer, 6 parts of antioxidant, 2 parts of cashew nut shell oil, 1.5 parts of sulfur, 2 parts of accelerator and 4 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0030] Example 5

[0031] Example 5 is different from Example 1 in that the amounts of new heavy environmental protection plasticizer and antioxidant are increased; the amounts of each substance in the tread rubber formulation are counted by weight parts, including 7.5 parts of natural rubber, 75 parts of styrene-butadiene rubber, 17.5 parts of butadiene rubber, 80 parts of ordinary white carbon black, 8 parts of silane coupling agent, 7.5 parts of carbon black, 1.7 parts of stearic acid, 2.5 parts of activator ZnO, 5 parts of new heavy environmental protection plasticizer, 6.8 parts of antioxidant, 3 parts of cashew nut shell oil, 2 parts of sulfur, 3 parts of accelerator and 6 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0032] Example 6

[0033] Example 6 is different from Example 1 in that the amounts of new heavy environmental protection plasticizer and antioxidant are increased; the amounts of each substance in the tread rubber formulation are counted by weight parts, including 10 parts of natural rubber, 80 parts of styrene-butadiene rubber, 20 parts of butadiene rubber, 90 parts of ordinary white carbon black, 9 parts of silane coupling agent, 9 parts of carbon black, 2 parts of stearic acid, 3 parts of activator ZnO, 6 parts of new heavy environmental protection plasticizer, 7.5 parts of antioxidant, 4 parts of cashew nut shell oil, 2.5 parts of sulfur, 4 parts of accelerator and 8 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0034] Comparative Example 1 The difference between Comparative Example 1 and Example 1 is that the new heavy environmentally-friendly plasticizer is not added, and the environmentally-friendly aromatic hydrocarbon oil is used instead of cashew nut shell oil; each substance in the formula of the tread rubber is counted by weight parts, including 5 parts of natural rubber, 70 parts of styrene-butadiene rubber, 15 parts of butadiene rubber, 70 parts of ordinary white carbon black, 7 parts of silane coupling agent, 6 parts of carbon black, 1.5 parts of stearic acid, 2 parts of activator ZnO, 4.5 parts of antioxidant, 6 parts of environmentally-friendly aromatic hydrocarbon oil, 1.5 parts of sulfur, 2 parts of accelerator, and 4 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0035] Comparative Example 2 The difference between Comparative Example 1 and Example 1 is that the new heavy environmentally-friendly plasticizer is not added, and the environmentally-friendly aromatic hydrocarbon oil is used instead of cashew nut shell oil; each substance in the formula of the tread rubber is counted by weight parts, including 7.5 parts of natural rubber, 75 parts of styrene-butadiene rubber, 17.5 parts of butadiene rubber, 80 parts of ordinary white carbon black, 8 parts of silane coupling agent, 7.5 parts of carbon black, 1.7 parts of stearic acid, 2.5 parts of activator ZnO, 5.3 parts of antioxidant, 8 parts of environmentally-friendly aromatic hydrocarbon oil, 2 parts of sulfur, 3 parts of accelerator, and 6 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0036] Comparative Example 3 The difference between Comparative Example 1 and Example 1 is that the new heavy environmentally-friendly plasticizer is not added, and the environmentally-friendly aromatic hydrocarbon oil is used instead of cashew nut shell oil; each substance in the formula of the tread rubber is counted by weight parts, including 10 parts of natural rubber, 80 parts of styrene-butadiene rubber, 20 parts of butadiene rubber, 90 parts of ordinary white carbon black, 9 parts of silane coupling agent, 9 parts of carbon black, 2 parts of stearic acid, 3 parts of activator ZnO, 6 parts of antioxidant, 10 parts of environmentally-friendly aromatic hydrocarbon oil, 2.5 parts of sulfur, 4 parts of accelerator, and 8 parts of filler dispersant and paraffin wax, and the specific preparation method is the same as that of Example 1.

[0037] In order to verify the effect of reducing rolling resistance, the production and application of improved formula 1 (Examples 1-3) and improved formula 2 (Examples 4-6) are carried out on the basis of the currently used formula of the tread.

[0038] The performance analysis results of the tread rubber prepared by Examples 1-6 and Comparative Examples 1-3 of the present application are listed in the following table: Table 1

[0039] *Note: MDR 2000: vulcanization instrument.

[0040] From the experimental results in the above table, it can be seen that, in the formula of the tread rubber, the new heavy environmental protection plasticizer is introduced and the cashew nut shell oil is used to replace the environmental protection aromatic oil, and on this basis, the proportion of the main rubber is adjusted, so that the Mooney viscosity ML(1+4)100℃ of the rubber material is reduced by 2.8%~8.3%, and the elongation is increased by 1.2%~1.4%, which shows that the introduction of the new heavy environmental protection plasticizer and the cashew nut shell oil has a positive effect on the tensile properties of the rubber material, and the processing performance of the rubber material is improved.

[0041] The final rubber obtained from Example 1 (improvement 1), Example 4 (improvement 2) and Comparative Example 1 (the currently used formula) is placed in an internal mixer and opened for 5 min at 100℃, and an opened sheet with a thickness of 3 mm is prepared for standby. Then the opened sheet is placed in a vulcanizing machine and vulcanized at 160℃ for 15 min. After vulcanization is completed, the performance of the vulcanized sheet is tested, and an aging experiment is carried out at a temperature of 40℃, a relative humidity of 60%, and an ozone concentration of 50pphm for 72h.

[0042] The aging experiment results show that the surface cracking time of the tread rubber prepared by Comparative Example 1 (the currently used formula) is 52h, and the cracking time of Example 1 (improvement 1) is delayed by 3h compared with Comparative Example 1. In particular, Example 4 (improvement 2) further increases the content of the new heavy environmental protection plasticizer and the antioxidant on the basis of the formula of Example 1 (improvement 1), and the cracking time of the tread rubber is delayed by 3h compared with Example 1 (improvement 1). From the above results, it can be seen that the cracking degree of the tread rubber of Example 4 (improvement 2) is the lowest, and the cracking degree of the tread rubber of Example 1 (improvement 1) is higher than that of Example 4 (improvement 2), and the cracking degree of the tread rubber of Comparative Example 1 (the currently used formula) is the highest. Figure 1 It can be seen from the comparison of the surface cracking morphology of the tread rubber that the cracking degree is: Example 4 (improvement 2) < Example 1 (improvement 1) < Comparative Example 1 (the currently used formula). The above results show that the tread rubber formula technology using the new heavy environmental protection plasticizer and replacing the environmental protection aromatic oil with the cashew nut shell oil can effectively delay the aging and cracking of the tread rubber, and the service life of the rubber material is increased by 6~12%.

[0043] Although the present application has been described in detail by the general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application, all belong to the scope of protection required by the present application.

Claims

1. A tread compound formulation for improving the anti-aging properties of rubber products, characterized in that, It is composed of the following substances: natural rubber, styrene-butadiene rubber, cis-butadiene rubber, ordinary silica, coupling agent, carbon black, stearic acid, activator, new heavy-duty environmentally friendly plasticizer, antioxidant, processing oil, vulcanizing agent, accelerator and other ingredients.

2. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The novel heavy environmentally friendly plasticizer is made from environmentally friendly heavy base oil from oil refineries through dehydration, degassing, and secondary solvent extraction.

3. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The coupling agent is a silane coupling agent.

4. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The activator is zinc oxide.

5. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The processed oil is cashew nut shell oil.

6. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The vulcanizing agent is sulfur.

7. The tread compound formulation for improving the anti-aging properties of rubber products as described in claim 1, characterized in that, The other components are fillers, dispersants, and paraffin.

8. The tread compound formulation for improving the anti-aging properties of rubber products as described in any one of claims 1 to 7, characterized in that, The substances, by weight, include 5-10 parts natural rubber, 70-80 parts styrene-butadiene rubber, 15-20 parts butadiene rubber, 70-90 parts ordinary silica, 7-9 parts coupling agent, 6-9 parts carbon black, 1.5-2 parts stearic acid, 2-3 parts activator, 3-5 parts new heavy-duty environmentally friendly plasticizer, 4.5-6 parts antioxidant, 3-5 parts processing oil, 1.5-2.5 parts vulcanizing agent, 2-4 parts accelerator, and 4-8 parts other components.

9. The tread compound formulation for improving the anti-aging properties of rubber products as described in any one of claims 1 to 7, characterized in that, The substances, by weight, include 5-10 parts natural rubber, 70-80 parts styrene-butadiene rubber, 15-20 parts butadiene rubber, 70-90 parts ordinary silica, 7-9 parts coupling agent, 6-9 parts carbon black, 1.5-2 parts stearic acid, 2-3 parts activator, 4-6 parts new heavy-duty environmentally friendly plasticizer, 6-7.5 parts antioxidant, 2-4 parts processing oil, 1.5-2.5 parts vulcanizing agent, 2-4 parts accelerator, and 4-8 parts other components.

10. A process for preparing a tread compound to improve the anti-aging properties of rubber products, applicable to the tread compound formulation for improving the anti-aging properties of rubber products as described in any one of claims 1 to 7, characterized in that, Includes the following steps: (1) A section of mixing Raise the top bolt, add natural rubber, styrene-butadiene rubber, and butadiene rubber to the internal mixer at 50 rpm, and mix for 30 seconds; raise the top bolt, adjust the internal mixer speed to 45 rpm, and add 80% ordinary silica and coupling agent; raise the top bolt, when the internal mixer temperature rises to 95℃, adjust the speed to 40 rpm, and add 100% silica; raise the top bolt, when the internal mixer temperature rises to 110℃, keep the speed constant, and add 80% stearic acid, activator, new heavy-duty environmentally friendly plasticizer, antioxidant, processing oil, and other components; raise the top bolt, when the internal mixer temperature rises to 120℃, adjust the speed to 35 rpm for cleaning; raise the top bolt, when the internal mixer temperature rises to 130℃, adjust the speed to 20 rpm, and maintain the temperature for 80 seconds; when the internal mixer temperature rises to 140℃, open the discharge door to discharge the rubber. (2) Two-stage mixing Lift the top bolt, add the first batch of compound rubber at a speed of 45 rpm in the internal mixer, and mix for 30 seconds; lift the top bolt, adjust the speed of the internal mixer to 40 rpm, and add the remaining 20% ​​ordinary silica and coupling agent; lift the top bolt, when the internal mixer temperature rises to 105℃, adjust the speed to 35 rpm, and add the remaining 20% ​​stearic acid, activator, new heavy-duty environmentally friendly plasticizer, antioxidant, processing oil, and other ingredients; lift the top bolt, when the internal mixer temperature rises to 115℃, adjust the speed to 30 rpm for cleaning; lift the top bolt, when the internal mixer temperature rises to 125℃, adjust the speed to 20 rpm, and maintain the temperature for 40 seconds; when the internal mixer temperature rises to 135℃, open the discharge door to discharge the rubber. (3) Final Refinement Raise the top bolt, add the second-stage compound, vulcanizing agent and accelerator at 30 rpm in the internal mixer, and mix for 30 seconds; raise the top bolt, adjust the speed of the internal mixer to 30 rpm, and clean it; when the temperature of the internal mixer rises to 100℃, open the discharge door to discharge the compound.

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