Rubber composition, rubber compound and preparation method thereof

Abstract

The invention provides a rubber composition, a rubber compound and a preparation method thereof. The rubber composition is prepared from the following components in parts by weight: 100.0 parts of diene rubber, 70.0 to 85.0 parts of carbon black, 2.6 to 7.5 parts of an anti-aging agent, 3.5 to 9.0 parts of an active agent, 1.0 to 4.0 parts of tackifying resin, 2.0 to 5.0 parts of chloranil, 2.0 to 6.0 parts of operating oil, 0.8 to 1.4 parts of a vulcanizing agent, 0.8 to 1.4 parts of an accelerant and 0.1 to 0.3 part of a scorch retarder. The chloranil is added into the rubber composition, so that the high-temperature resistance and flame retardance of the rubber composition are improved, and meanwhile, the physical properties such as wear resistance are not adversely affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of rubber, in particular to a rubber composition, a rubber compound and a preparation method thereof. BACKGROUND

[0002] The bead of a tire is the part directly contacting with the rim, and the force and temperature of the bead part are large during the driving of the tire due to the load, driving force, braking force and lateral force. For example, when the special purpose vehicle for long-distance transportation of flammable and explosive goods frequently brakes and accelerates on mountain roads, the temperature of the rim part is extremely high, which causes thermal damage to the bead part, and even causes the tire to burn. For special vehicles such as fire engines, the flame retardant performance of the tire is required to be higher, and therefore, it is necessary to improve the heat resistance and flame retardant performance of the bead part of the tire of the special vehicle.

[0003] At present, for improving the high temperature resistance of the bead part or other rubber parts, the proportion of sulfur and accelerator in the vulcanization system is usually adjusted to change the vulcanization system from the traditional polysulfide system to the semi-effective vulcanization system, and the bond energy of single sulfur bond and double sulfur bond is higher than that of polysulfide bond, so as to improve the high temperature resistance of the rubber part. In addition, a peroxide crosslinking system is introduced to introduce carbon-carbon single bond, but due to the difference in vulcanization rate between the peroxide vulcanization system and the conventional sulfur system, there are problems in the co-vulcanization between the tire side or bead and the adjacent rubber part, which causes the tire to be damaged too early, thereby limiting the application of the peroxide crosslinking system.

[0004] For improving the flame retardant performance of the rubber material, the common formula design is to introduce inorganic flame retardant or organic flame retardant. The Chinese patent application with the publication number CN104311909A provides a fire-resistant and flame-retardant tire rubber composition, which is compounded by adding zinc borate, antimony trioxide and decabromodiphenyl ether flame retardant, so as to achieve good flame retardant performance, and the aging resistance and flexing performance of the rubber composition meet the requirements by adjusting the raw rubber, antioxidant and filler system, but the modulus of the rubber composition in the patent is reduced, which cannot be used as the bead wear-resistant rubber, and also affects the wear resistance of the bead wear-resistant rubber.

[0005] For improving the flame retardant performance and high temperature resistance, the flame retardant causes the physical properties of the rubber to decrease to different degrees. Therefore, it is necessary to develop a high temperature resistant and flame retardant bead rubber composition to improve the high temperature resistance and flame retardant performance of the rubber while still having excellent wear resistance and other physical properties. SUMMARY

[0006] The main purpose of the present application is to provide a rubber composition, a rubber compound and a preparation method thereof, so as to solve the problem that the rubber composition in the prior art is difficult to balance the wear resistance and other physical properties while improving the high temperature resistance and flame retardant performance.

[0007] To achieve the above object, according to one aspect of the present application, there is provided a rubber composition comprising, in parts by weight: 100.0 parts of diene rubber, 70.0-85.0 parts of carbon black, 2.6-7.5 parts of antioxidant, 3.5-9.0 parts of activator, 1.0-4.0 parts of tackifying resin, 2.0-5.0 parts of chloranil, 2.0-6.0 parts of process oil, 0.8-1.4 parts of vulcanizing agent, 0.8-1.4 parts of accelerator, and 0.1-0.3 parts of scorch retardant.

[0008] Further, the above rubber composition comprises, in parts by weight: 100.0 parts of diene rubber, 72.0-82.0 parts of carbon black, 2.8-7.0 parts of antioxidant, 4.0-8.0 parts of activator, 1.0-4.0 parts of tackifying resin, 2.2-4.8 parts of chloranil, 2.5-5.5 parts of process oil, 0.8-1.2 parts of vulcanizing agent, 0.8-1.2 parts of accelerator, and 0.1-0.25 parts of scorch retardant.

[0009] Further, the diene rubber is natural rubber and / or diene synthetic rubber; wherein the diene synthetic rubber is selected from any one or more of butadiene rubber, styrene-butadiene rubber, and nitrile rubber; when the diene rubber is a mixed rubber of natural rubber and diene synthetic rubber, the parts by weight of natural rubber is 30.0-50.0, and the parts by weight of diene synthetic rubber is 40.0-70.0.

[0010] Further, the mass ratio of chloranil, natural rubber, and diene synthetic rubber is 2-5: 35-55: 45-65.

[0011] Further, the grade of the carbon black is selected from any one or more of N330, N347, N375, N326, N351, N339 and N220; and / or, the antioxidant is selected from any one or more of antioxidant wax, antioxidant RD and antioxidant 4020; wherein the weight fraction of the antioxidant wax is 0.8-2.0 parts, preferably 0.8-1.5 parts; the weight fraction of the antioxidant RD is 0.8-2.5 parts, preferably 1.0-2.5 parts; the weight fraction of the antioxidant 4020 is 1.0-3.0 parts, preferably 1.0-2.5 parts; and / or, the active agent includes stearic acid and zinc oxide, the weight fraction of the stearic acid is 1.0-3.0 parts, preferably 1.5-3.0 parts; the zinc oxide is indirect zinc oxide, the weight fraction of the zinc oxide is 2.5-6.0 parts, preferably 2.5-5.0 parts; and / or, the tackifying resin is selected from any one or more of KORESIN resin, t-butyl phenolic tackifying resin and p-tetraoctyl phenolic tackifying resin; and / or, the process oil is selected from any one or more of aromatic oil, naphthenic oil and paraffinic oil.

[0012] Further, the vulcanizing agent is sulfur; and / or, the accelerator is selected from any one or more of accelerator NS, accelerator CZ and accelerator DZ; and / or, the scorch retarder is scorch retarder CTP.

[0013] According to another aspect of the present application, there is provided a rubber mixture obtained by mixing the rubber composition described above.

[0014] According to yet another aspect of the present application, there is provided a method for preparing the rubber mixture described above, the method comprising: step S1, sequentially subjecting raw materials including diene rubber, first carbon black, active agent and process oil to primary mixing and first discharging to obtain a primary master batch; step S2, sequentially subjecting raw materials including the primary master batch, antioxidant, tackifying resin and second carbon black to secondary mixing and second discharging to obtain a secondary master batch; and step S3, sequentially subjecting raw materials including the secondary master batch, chloranil, vulcanizing agent, accelerator and scorch retarder to final mixing and third discharging to obtain the rubber mixture.

[0015] Further, the mass ratio of the first carbon black to the second carbon black is 1-3:1; and / or, the rotation speed of the primary mixing is 35-48 rpm, and the time of the primary mixing is 120-160 s; the temperature of the first discharging is 165-170°C.

[0016] Further, the rotation speed of the secondary mixing is 30-35 rpm, and the time of the secondary mixing is 120-160 s; the temperature of the second discharging is 160-165°C; and / or, the rotation speed of the final mixing is 28-35 rpm, and the time of the final mixing is 90-140 s; the temperature of the third discharging is 100-110°C.

[0017] By applying the technical solution of the present application, the present application provides a rubber composition containing chloranil, which uses chloranil as a crosslinking agent for rubber, replacing part of the traditional vulcanizing agent and accelerator system. Specifically, chloranil can not only act as a crosslinking agent for diene rubber, enabling diene rubber to form carbon-carbon crosslinking bonds and thus improving the high-temperature resistance of the rubber composition; but also can act as a suspended side group for diene rubber, providing excellent flame retardant performance for the rubber composition. At the same time, chloranil is directly bonded to the rubber molecular chain in the form of a chemical bond, so that the addition of chloranil can improve the high-temperature resistance and flame retardant performance of the rubber composition without adversely affecting physical properties such as wear resistance, thereby better serving as a tread wear-resistant rubber for special vehicles. In addition, the addition of carbon black can combine with rubber molecules, thereby improving the strength, hardness, and wear resistance of the rubber composition. The addition of an antioxidant can delay the aging of rubber, thereby prolonging the service life of the tread wear-resistant rubber. The addition of stearic acid, zinc oxide, accelerators, and vulcanizing agents can promote the crosslinking reaction process between them and the rubber molecular chain, thereby forming a three-dimensional network structure and accelerating vulcanization, and further improving the hardness, wear resistance, and tear resistance of the tread wear-resistant rubber. The addition of tackifying resin can improve the processing performance of the rubber composition. The addition of process oil can improve the flowability of the rubber composition, making it easier to process during processing and reducing energy consumption during the mixing process. The addition of scorch retarder can prevent the rubber composition from scorching prematurely, thereby improving the quality of the tread wear-resistant rubber. DETAILED DESCRIPTION

[0018] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the embodiments.

[0019] As analyzed in the background art of the present application, the rubber composition in the prior art has the problem of being difficult to balance the wear resistance and other physical properties while improving the high-temperature resistance and flame retardant performance. In order to solve the above problems, the present application provides a rubber composition, a rubber compound, and a preparation method thereof.

[0020] In a typical embodiment of the present application, a rubber composition is provided, which includes, in parts by weight: 100.0 parts of diene rubber, 70.0-85.0 parts of carbon black, 2.6-7.5 parts of antioxidant, 3.5-9.0 parts of active agent, 1.0-4.0 parts of tackifying resin, 2.0-5.0 parts of chloranil, 2.0-6.0 parts of process oil, 0.8-1.4 parts of vulcanizing agent, 0.8-1.4 parts of accelerator, and 0.1-0.3 parts of scorch retarder.

[0021] The application provides a rubber composition containing chloranil, which uses chloranil as a crosslinking agent of rubber, instead of part of a traditional vulcanizing agent and accelerator system. Specifically, chloranil can not only be used as a crosslinking agent of diene rubber to make diene rubber form carbon-carbon crosslinking bonds, thereby improving the high-temperature resistance of the rubber composition; but also can be used as a suspended side group of diene rubber to provide excellent flame retardation of the rubber composition. Meanwhile, chloranil is directly bonded to the rubber molecular chain in the form of a chemical bond, so that the addition of chloranil can improve the high-temperature resistance and flame retardation of the rubber composition without adversely affecting the physical properties such as wear resistance, so that the rubber composition is better applied to special vehicles as a tread wear-resistant rubber. In addition, the addition of carbon black can be combined with the rubber molecules to improve the strength, hardness and wear resistance of the rubber composition. The addition of an antioxidant can delay the aging of the rubber, thereby prolonging the service life of the tread wear-resistant rubber. The addition of stearic acid, zinc oxide, accelerators and vulcanizing agents can promote the crosslinking reaction process between them and the rubber molecular chain, thereby forming a three-dimensional network structure and accelerating vulcanization, and further improving the hardness, wear resistance and tear resistance of the tread wear-resistant rubber. The addition of tackifying resin can improve the processing performance of the rubber. The addition of operating oil can improve the flowability of the rubber, making it easier to process during processing and reducing energy consumption during mixing. The addition of an anti-scorching agent can prevent the rubber composition from scorching prematurely, thereby improving the quality of the tread wear-resistant rubber.

[0022] In order to further improve the high-temperature resistance and flame retardation of the rubber composition, in an embodiment of the application, the rubber composition contains, in parts by weight, 100.0 parts of diene rubber, 72.0-82.0 parts of carbon black, 2.8-7.0 parts of an antioxidant, 4.0-8.0 parts of an activator, 1.0-4.0 parts of tackifying resin, 2.2-4.8 parts of chloranil, 2.5-5.5 parts of operating oil, 0.8-1.2 parts of a vulcanizing agent, 0.8-1.2 parts of an accelerator and 0.1-0.25 parts of an anti-scorching agent.

[0023] In an embodiment of the application, the diene rubber is natural rubber and / or diene synthetic rubber; wherein the diene synthetic rubber is selected from any one or more of butadiene rubber, styrene-butadiene rubber and nitrile rubber; when the diene rubber is a mixed rubber of natural rubber and diene synthetic rubber, the weight fraction of the natural rubber is 30.0-50.0 parts, and the weight fraction of the diene synthetic rubber is 40.0-70.0 parts.

[0024] It is preferred that the type of diene rubber is in the above range, which helps the rubber to form carbon-carbon crosslinking bonds with chloranil, thereby further improving the high-temperature resistance of the rubber composition, and helps chloranil to further improve the flame retardation of the rubber composition as a suspended side group of diene rubber, while having no adverse effect on the physical properties such as wear resistance of the rubber composition.

[0025] Preferably, the weight average molecular weight of the synthetic diene rubber is 250,000-750,000. Further preferably, the diene rubber is a combination of natural rubber and butadiene rubber, the mass ratio of which is 20:80-50:50, wherein the natural rubber is SMR20# natural rubber, and the butadiene rubber is high-cis butadiene rubber, the mass content of cis-1,4 structure of which is 96-98%.

[0026] In an embodiment of the present application, the mass ratio of the chloranil, the natural rubber and the synthetic diene rubber is 2-5:35-55:45-65.

[0027] Preferably, the mass ratio of the chloranil, the natural rubber and the synthetic diene rubber is within the above range, which is helpful for the rubber to form carbon-carbon cross-linking with the chloranil, thereby further improving the high-temperature resistance of the rubber composition, and is also helpful for the chloranil to further improve the flame retardation of the rubber composition as a pendant side group of the diene rubber, while having no adverse effect on the physical properties such as wear resistance of the rubber composition.

[0028] Preferably, the mass ratio of the chloranil and the vulcanizing agent is 2-5:1, which is helpful for maintaining the integrity of the cross-linking network, thereby improving the wear resistance.

[0029] In an embodiment of the present application, the grade of the carbon black is selected from any one or more of N330, N347, N375, N326, N351, N339 and N220; and / or, the antioxidant is selected from any one or more of antioxidant wax, antioxidant RD and antioxidant 4020; wherein the weight fraction of the antioxidant wax is 0.8-2.0 parts, preferably 0.8-1.5 parts; the weight fraction of the antioxidant RD is 0.8-2.5 parts, preferably 1.0-2.5 parts; the weight fraction of the antioxidant 4020 is 1.0-3.0 parts, preferably 1.0-2.5 parts; and / or, the active agent includes stearic acid and zinc oxide, the weight fraction of the stearic acid is 1.0-3.0 parts, preferably 1.5-3.0 parts; the zinc oxide is indirect zinc oxide, the weight fraction of the zinc oxide is 2.5-6.0 parts, preferably 2.5-5.0 parts; and / or, the tackifying resin is selected from any one or more of KORESIN resin, t-butyl phenolic tackifying resin and p-t-octyl phenolic tackifying resin; and / or, the process oil is selected from any one or more of aromatic oil, naphthenic oil and paraffinic oil, preferably the aromatic oil is environmentally friendly oil TDAE (environmentally friendly aromatic oil).

[0030] Preferably, the type and amount of carbon black is in the above range, which helps to promote the combination of carbon black and rubber molecules, thereby improving the strength, hardness and wear resistance of the rubber composition. Preferably, the type and amount of antioxidant is in the above range, and further preferably the antioxidant is a combination of antioxidant wax, antioxidant RD and antioxidant 4020, which helps to delay the aging of the vulcanized rubber, thereby helping to extend the service life of the tread wear-resistant rubber.

[0031] Preferably, the type and amount of stearic acid and zinc oxide is in the above range, which helps to accelerate the vulcanization process, improve the vulcanization effect, and at the same time improve the processing performance and physical properties of the rubber, such as hardness, wear resistance and tear resistance. Preferably, the type of tackifying resin is in the above range, which helps to improve the processing performance of the rubber. Preferably, the type of processing oil is in the above range, which helps to improve the flowability of the rubber, making it easier to process during processing, thereby reducing energy consumption during mixing.

[0032] In one embodiment of the present application, the vulcanizing agent is sulfur; and / or, the accelerator is selected from any one or more of accelerator NS, accelerator CZ and accelerator DZ; and / or, the scorch retarder is scorch retarder CTP; and / or, the rubber composition further comprises 0.1-0.5 parts by weight of an environmentally friendly peptizer, which is 2,2'-dibenzamide diphenyl disulfide.

[0033] Preferably, the type of vulcanizing agent and accelerator is in the above range, which helps to accelerate the vulcanization reaction between sulfur and rubber molecules, forming a uniform and stable cross-linked structure, thereby helping to improve the hardness, wear resistance and tear strength of the tread wear-resistant rubber. Preferably, the type of scorch retarder is in the above range, which helps to control the vulcanization rate, thereby improving the quality of the tread wear-resistant rubber.

[0034] Preferably, the above types and amounts of additives are added, which helps to improve the mixing efficiency and adjust the performance according to the use requirements.

[0035] In another typical embodiment of the present application, a mixed rubber is provided, which is obtained by mixing the above-mentioned rubber composition.

[0036] The mixed rubber obtained by mixing the above-mentioned rubber composition has good high temperature resistance and flame retardance, while taking into account the physical properties such as wear resistance, thereby being better applied to special vehicles.

[0037] In another typical embodiment of the present application, a preparation method of the above-mentioned rubber compound is provided, which comprises: step S1, sequentially performing one-stage mixing and first discharging on raw materials comprising diene rubber, first carbon black, active agent and process oil to obtain one-stage rubber compound; step S2, sequentially performing two-stage mixing and second discharging on raw materials comprising one-stage rubber compound, antioxidant, tackifying resin and second carbon black to obtain two-stage rubber compound; and step S3, sequentially performing final mixing and third discharging on raw materials comprising two-stage rubber compound, chloranil, vulcanizing agent, accelerator and anti-scorching agent to obtain the rubber compound.

[0038] In the present application, the first carbon black, active agent and process oil are uniformly dispersed into the diene rubber through one-stage mixing to form one-stage rubber compound with good dispersibility and plasticity, thereby facilitating subsequent processing. The antioxidant, tackifying resin and second carbon black are dispersed in the one-stage rubber compound through two-stage mixing to improve the aging resistance and adhesion of the rubber, and the addition of the second carbon black further improves the physical properties of the sub-gasket, such as wear resistance and strength. Meanwhile, the two-stage mixing not only ensures that the newly added materials are uniformly distributed in the rubber matrix, but also further enhances the dispersion effect of the raw materials added in the one-stage mixing. The addition of chloranil, vulcanizing agent, accelerator and anti-scorching agent in the final mixing process ensures that each component is uniformly distributed in the rubber matrix, and the addition of chloranil in this stage can replace part of the traditional vulcanizing agent and accelerator system to form a more stable cross-linked structure, thereby improving the high-temperature resistance and flame retardance of the rubber. Therefore, the rubber compound obtained by the preparation method of the present application has good high-temperature resistance and flame retardance, while considering the physical properties such as wear resistance, thereby better applying to special vehicles.

[0039] In an embodiment of the present application, the mass ratio of the first carbon black to the second carbon black is 1-3:1; and / or, the rotation speed of the one-stage mixing is 35-48 rpm, the time of the one-stage mixing is 120-160 s; and the temperature of the first discharging is 165-170°C.

[0040] Preferably, the first carbon black and the second carbon black are added in the one-stage mixing and the two-stage mixing, respectively, and the mass ratio of the two is controlled in the above-mentioned range, which helps to improve the dispersibility of the carbon black. The first carbon black is added in the one-stage mixing to preliminarily disperse the carbon black, at this time the rubber matrix is relatively soft, which is conducive to the uniform dispersion of the carbon black. The second carbon black is added in the two-stage mixing to further refine the carbon black particles and improve the overall dispersion effect. Preferably, the rotation speed, time of the one-stage mixing and the temperature of the first discharging are controlled in the above-mentioned range, which helps to improve the dispersibility of the first carbon black, active agent and process oil in the diene rubber, thereby facilitating subsequent processing.

[0041] In one embodiment of the present application, the rotation speed of the second mixing is 30-35 rpm, the time of the second mixing is 120-160 s; the temperature of the second discharge is 160-165 °C; and / or, the rotation speed of the final mixing is 28-35 rpm, the time of the final mixing is 90-140 s; the temperature of the third discharge is 100-110 °C.

[0042] Preferably, the rotation speed, time of the second mixing and the temperature of the second discharge are controlled in the above ranges, which helps to disperse the antioxidant, tackifying resin and the second carbon black in the first masterbatch, to improve the aging resistance and adhesion of the rubber, and the addition of the second carbon black further improves the physical properties of the sub-port wear part, such as wear resistance and strength, and also helps to further strengthen the dispersion effect. Preferably, the rotation speed, time of the final mixing and the temperature of the third discharge are controlled in the above ranges, which helps to uniformly disperse the chloranil, vulcanizing agent, accelerator and anti-scorching agent, and the addition of chloranil in this stage helps to form a more stable cross-linking structure, thereby improving the high temperature resistance and flame resistance of the rubber.

[0043] The beneficial effects of the present application will be further illustrated in conjunction with the examples below.

[0044] The mixing rubber of Examples 1-4 and Comparative Examples 1-3 is prepared by the same method, except that the rubber composition formulations are different, and the composition and source of the rubber composition are shown in Table 1.

[0045] Example 1

[0046] The composition of the rubber composition is shown in Table 1.

[0047] The rubber composition is used as raw material to prepare the mixing rubber by the following preparation method:

[0048] In a GK255 internal mixer, the rotation speed is set to 45 rpm, and the natural rubber, butadiene rubber, 2 / 3 of the total mass of carbon black, zinc oxide, stearic acid, and environmentally friendly peptizer are added, and the top bolt is pressed and mixed for 35 s, and the top bolt is raised to the position, and the environmentally friendly oil is added, and the top bolt is pressed, and the rotation speed is adjusted to 40 rpm, and mixed for 35 s, and the top bolt is raised, and the top bolt is pressed and mixed for 35 s, and the top bolt is raised, and the top bolt is pressed and mixed for 35 s, and the discharge door is opened, and the first discharge is carried out, and the temperature of the first discharge is controlled at 165-170 °C; the mill is opened and the sheet is cooled and collected, and the first masterbatch is obtained.

[0049] In the GK255 internal mixer, the rotation speed was set to 35 rpm, and a first-stage masterbatch, an antioxidant, a tackifying resin, and 1 / 3 of the total mass of carbon black were added, and the top bolt was pressed and mixed for 35 s, the top bolt was raised, the rotation speed was adjusted to 32 rpm, and the top bolt was pressed and mixed for 35 s, the top bolt was raised, the top bolt was pressed and mixed for 35 s, the top bolt was raised, the top bolt was pressed and mixed for 35 s, the top bolt was pressed, the discharge door was opened, and the second-stage masterbatch was discharged, and the temperature of the second-stage masterbatch was controlled at 160-165℃; the mill was opened, and the second-stage masterbatch was cooled and collected to obtain a second-stage masterbatch.

[0050] In the GK255 internal mixer, the rotation speed was set to 30 rpm, and the second-stage masterbatch, p-chloranil, sulfur, an accelerator, and an anti-scorching agent were added, the top bolt was pressed, and mixed for 35 s, the top bolt was pressed, and mixed for 35 s, the top bolt was raised, the top bolt was pressed and mixed for 35 s, the top bolt was raised, the top bolt was pressed and mixed for 35 s, the discharge door was opened, and the third-stage masterbatch was discharged, and the temperature of the third-stage masterbatch was controlled at 100-110℃; the mill was opened, and the third-stage masterbatch was cooled and collected to obtain a mixed rubber.

[0051] Example 5

[0052] The difference from Example 1 is that the weight fraction of p-chloranil is 3 parts, the weight fraction of natural rubber is 45 parts, the weight fraction of butadiene rubber is 55 parts, and the mass ratio of p-chloranil, natural rubber, and butadiene rubber is 3:45:55, and finally a mixed rubber is obtained.

[0053] Example 6

[0054] The difference from Example 1 is that the weight fraction of p-chloranil is 3, the weight fraction of natural rubber is 30 parts, the weight fraction of butadiene rubber is 70 parts, and the mass ratio of p-chloranil, natural rubber, and butadiene rubber is 3:30:70, and finally a mixed rubber is obtained.

[0055] Example 7

[0056] The difference from Example 1 is that the weight fraction of p-chloranil is 2 parts, the weight fraction of sulfur is 0.8 parts, and the mass ratio of p-chloranil and sulfur is 2.5:1, and finally a mixed rubber is obtained.

[0057] Example 8

[0058] The difference from Example 1 is that the weight fraction of p-chloranil is 2 parts, the weight fraction of sulfur is 1.4 parts, and the mass ratio of p-chloranil and sulfur is 2:1.4, and finally a mixed rubber is obtained.

[0059] Test method:

[0060] Tensile property test: The tensile property test was performed according to GB / T 528-2009 “Rubber and Vulcanized Rubber Products-Determination of Tensile Properties”.

[0061] Thermal oxygen aging performance test: aging condition is 100℃, 48h, and vulcanization condition is 150℃, 30min.

[0062] Flame retardant performance test: GB / T 10707-2008 Determination of the burning behavior of rubber.

[0063] Abrasion resistance performance test: GB / T 9867-2008 Determination of the abrasion resistance of vulcanized or thermoplastic rubber (rotating drum abrasion machine method).

[0064] The above examples and comparative examples of the rubber compound were subjected to performance tests, and the test results are shown in Tables 2 and 3.

[0065] Table 1

[0066]

[0067]

[0068] Table 2

[0069]

[0070] Table 3

[0071]

[0072]

[0073] From the above description, it can be seen that the above-mentioned examples of the present application achieve the following technical effects:

[0074] The application provides a rubber composition containing chloranil, which uses chloranil as a crosslinking agent of rubber, instead of part of traditional vulcanizing agent and accelerator system, specifically, the chloranil can not only be used as a crosslinking agent of diene rubber, so that the diene rubber forms carbon-carbon crosslinking bond, thereby improving the high temperature resistance of the rubber composition; the chloranil can also be used as a suspended side group of diene rubber, so as to provide excellent flame retardant performance for the rubber composition. At the same time, the chloranil is directly bonded to the rubber molecular chain in the form of chemical bond, therefore, the addition of chloranil can improve the high temperature resistance and flame retardant performance of the rubber composition without adversely affecting the physical properties such as wear resistance, so as to be better applied to special vehicles as a tread wear-resistant rubber. In addition, the addition of carbon black can be combined with the rubber molecules, so as to improve the strength, hardness and wear resistance of the rubber composition. The addition of anti-aging agent can delay the aging of rubber, thereby prolonging the service life of the tread wear-resistant rubber. The addition of stearic acid, zinc oxide, accelerator and vulcanizing agent can promote the crosslinking reaction process between them and the rubber molecular chain, so as to form a three-dimensional network structure and accelerate the vulcanization, thereby improving the hardness, wear resistance and tear resistance of the tread wear-resistant rubber. The addition of tackifying resin can improve the processing performance of the rubber. The addition of operating oil can improve the flowability of the rubber, so that it is easier to process in the processing process, and reduce the energy consumption in the mixing process. The addition of scorch retarder can prevent the rubber composition from scorching in advance, thereby improving the quality of the tread wear-resistant rubber.

[0075] The above is only an embodiment of the application and is not used to limit the application. The application can have various modifications and changes for those skilled in the art. Any modification, equivalent replacement, improvement, etc. within the spirit and principle of the application shall be included in the protection scope of the application.

Claims

1. A rubber composition characterized in that, The rubber composition comprises, in parts by weight: 100.0 parts of diene rubber; 70.0-85.0 parts of carbon black; 2.6-7.5 parts of antioxidant; 3.5-9.0 parts of active agent; 1.0-4.0 parts of tackifying resin; 2.0-5.0 parts of chloranil; 2.0-6.0 parts of process oil; 0.8-1.4 parts of vulcanizing agent; 0.8-1.4 parts of accelerator; and 0.1-0.3 parts of scorch retardant.

2. The rubber composition according to claim 1, characterized in that, The rubber composition comprises, in parts by weight: 100.0 parts of the diene rubber; 72.0-82.0 parts of the carbon black; 2.8-7.0 parts of the antioxidant; 4.0-8.0 parts of the active agent; 1.0-4.0 parts of the tackifying resin; 2.2-4.8 parts of the chloranil; 2.5-5.5 parts of the process oil; 0.8-1.2 parts of the vulcanizing agent; 0.8-1.2 parts of the accelerator; and 0.1-0.25 parts of the scorch retardant.

3. Rubber composition according to claim 1 or 2, characterized in that, The diene rubber is natural rubber and / or diene synthetic rubber; wherein the diene synthetic rubber is selected from any one or more of butadiene rubber, styrene-butadiene rubber, nitrile-butadiene rubber; when the diene rubber is a mixed rubber of natural rubber and diene synthetic rubber, the parts by weight of the natural rubber is 30.0-50.0 parts, and the parts by weight of the diene synthetic rubber is 40.0-70.0 parts.

4. The rubber composition according to claim 3, characterized in that, The mass ratio of the chloranil, the natural rubber and the diene synthetic rubber is 2-5: 35-55: 45-65.

5. The rubber composition according to any one of claims 1 to 4, characterized in that, The grade of the carbon black is selected from any one or more of N330, N347, N375, N326, N351, N339 and N220; and / or, the antioxidant is selected from any one or more of antioxidant wax, antioxidant RD and antioxidant 4020; wherein the parts by weight of the antioxidant wax is 0.8-2.0 parts, preferably 0.8-1.5 parts; the parts by weight of the antioxidant RD is 0.8-2.5 parts, preferably 1.0-2.5 parts; the parts by weight of the antioxidant 4020 is 1.0-3.0 parts, preferably 1.0-2.5 parts; and / or, the active agent comprises stearic acid and zinc oxide, the parts by weight of the stearic acid is 1.0-3.0 parts, preferably 1.5-3.0 parts; the zinc oxide is indirect zinc oxide, the parts by weight of the zinc oxide is 2.5-6.0 parts, preferably 2.5-5.0 parts; and / or, the tackifying resin is selected from any one or more of KORESIN resin, t-butyl phenolic tackifying resin and p-tetraoctyl phenolic tackifying resin; and / or, the process oil is selected from any one or more of aromatic oil, naphthenic oil and paraffinic oil.

6. The rubber composition according to any one of claims 1 to 5, characterized in that, The vulcanizing agent is sulphur; and / or, the accelerator is selected from any one or more of accelerator NS, accelerator CZ and accelerator DZ; and / or, the scorch retardant is scorch retardant CTP.

7. A rubber compound obtained by mixing a rubber composition, characterized in that, The rubber composition is the rubber composition of any one of claims 1-6.

8. A process for preparing the rubber mix of claim 7, characterized in that, The preparation method comprises: Step S1, raw materials including diene rubber, first carbon black, active agent, operating oil are sequentially subjected to one-stage mixing and first discharging, to obtain one-stage masterbatch; Step S2, raw materials including the one-stage masterbatch, antioxidant, tackifying resin and second carbon black are sequentially subjected to two-stage mixing and second discharging, to obtain two-stage masterbatch; and Step S3, raw materials including the two-stage masterbatch, chloranil, vulcanizing agent, accelerator and anti-scorching agent are sequentially subjected to final mixing and third discharging, to obtain the mixing rubber.

9. The production method according to claim 8, characterized by, The mass ratio of the first carbon black and the second carbon black is 1-3:1; and / or, the rotating speed of the one-stage mixing is 35-48 rpm, and the time of the one-stage mixing is 120-160 s; The temperature of the first discharging is 165-170℃.

10. The production method according to claim 8 or 9, characterized by, The rotating speed of the two-stage mixing is 30-35 rpm, and the time of the two-stage mixing is 120-160 s; the temperature of the second discharging is 160-165℃; and / or, the rotating speed of the final mixing is 28-35 rpm, and the time of the final mixing is 90-140 s; the temperature of the third discharging is 100-110℃.

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