Track pattern side rubber composition, track pattern side rubber and application of track pattern side rubber

Abstract

The invention provides a track pattern side rubber composition, track pattern side rubber and application thereof, and particularly relates to the technical field of tire manufacturing. The track pattern side rubber composition comprises the following components in parts by weight: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 25-70 parts of a flame retardant, 5-10 parts of an activating agent, 0.5-1.5 parts of an activating auxiliary agent, 1-3 parts of an anti-aging agent, 1-4 parts of a vulcanizing agent and 2-4 parts of an accelerant, the flame retardant comprises antimony trioxide. According to the track pattern side rubber composition provided by the invention, through the synergistic effect of the raw materials, the maintenance of physical properties is ensured while the flame-retardant property is improved, and dual optimization of the flame-retardant property and the physical properties is realized. Meanwhile, the invention provides a mixing method of the track pattern side rubber, and the problem that high-part white carbon black is not easy to disperse is solved.

Description

Technical Field

[0001] The invention relates to the technical field of tire manufacturing, and in particular to a track pattern side rubber composition, a track pattern side rubber and applications thereof. Background Art

[0002] The tread side rubber is an important part of the track. Its function is to prevent the belt body from mechanical damage and early wear, while transmitting the vehicle's traction and braking force to the road surface, increasing the grip with the road surface, and absorbing and transmitting the vibration of the track during movement. As a polymer rubber material, the tread side rubber is flammable, which not only affects the service life of the track, but also poses a challenge to environmental protection requirements. Rubber, as the basic raw material of the rubber industry, is widely used in tires, tracks, conveyor belts, hoses, soles, cables and other fields due to its good resilience, insulation, plasticity, wear resistance, oil resistance and acid and alkali resistance. However, rubber itself is a polymer flammable material. It is easy to thermally decompose in an environment with high temperature or close to a fire source, releasing flammable rubber hydrocarbon gas, which may spontaneously combust when in contact with oxygen and reaching a certain concentration. Therefore, the flame retardancy and flame retardancy of rubber are crucial to the driving safety and environmental protection of the track. Improving the flame retardancy of the tread side rubber of the track has become an important task.

[0003] Although the existing technology can improve the flame retardant properties of tracks to a certain extent, it still faces some challenges. The use of flame retardants may affect other properties of tracks, such as cut resistance and aging resistance. In addition, white carbon black, which is commonly used in conventional flame retardant formulations to replace carbon black, has the problem of difficult dispersion, which affects the mixing process. Therefore, the main problem of the current technology is how to improve the flame retardant properties of tracks while avoiding negative effects on other properties, reducing production costs, and reducing environmental pollution.

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

[0005] One of the objectives of the present invention is to provide a track pattern side rubber composition to alleviate at least one of the above-mentioned technical problems in the prior art.

[0006] A second object of the present invention is to provide a track pattern side rubber.

[0007] A third object of the present invention is to provide an application of a track pattern side rubber.

[0008] In order to solve the above-mentioned technical problems, the present invention particularly adopts the following technical solutions: The first aspect of the present invention provides a track pattern side rubber composition, which comprises, by weight: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 25-70 parts of flame retardant, 5-10 parts of activator, 0.5-1.5 parts of activation aid, 1-3 parts of antioxidant, 1-4 parts of vulcanizing agent and 2-4 parts of accelerator; The flame retardant includes antimony trioxide.

[0009] Furthermore, the flame retardant further comprises tricresyl phosphate and / or chlorinated paraffin.

[0010] Furthermore, the activator includes magnesium oxide and / or zinc oxide.

[0011] The activating aid includes stearic acid.

[0012] Furthermore, the brands of the antioxidant include antioxidant 4020 and / or antioxidant RD.

[0013] The vulcanizing agent includes sulfur.

[0014] The brand of the accelerator includes at least one of NA-22, DM and CZ.

[0015] Furthermore, the grade of the carbon black includes N234.

[0016] The white carbon black includes vapor deposition white carbon black and precipitation white carbon black.

[0017] The white carbon black has a silicon dioxide content of ≥99.8%, an average particle size of 8-19 nm, a specific surface area of ​​130-400 m² / g, a DBP oil absorption value of 1.5-2 cm³ / g, a relative density of 2.00-2.30 g / cm³, a pH value of 3.9-4.0, and a moisture content of 1.0-1.5%.

[0018] Furthermore, the track pattern side rubber composition comprises, in parts by weight: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 20-60 parts of antimony trioxide, 5-10 parts of chlorinated paraffin, 3-6 parts of zinc oxide, 2-4 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur, and 2-4 parts of accelerator.

[0019] The second aspect of the present invention provides a track pattern side rubber, which is mainly obtained by mixing the track pattern side rubber composition.

[0020] Further, the mixing comprises the following steps: A. mixing white carbon black and antimony trioxide and dispersing them uniformly to obtain a suspension; then mixing the suspension with natural rubber to obtain a first masterbatch; B. Mixing other raw materials except the vulcanizing agent and the accelerator, and performing two-stage mixing to obtain a second masterbatch; C. adding the first masterbatch to the second masterbatch and mixing them in three stages and four stages to obtain a third masterbatch; D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track pattern side rubber.

[0021] The one-stage mixing process is: mixing the suspension and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber.

[0022] Furthermore, the two-stage mixing includes mixing for 20-60 seconds, mixing with the plug lifted and pressed for 20-35 seconds, and then mixing with the plug lifted and pressed to 150-165° C. for debonding in this order.

[0023] The three-stage mixing includes mixing for 15-50 seconds, mixing for 15-30 seconds with the bolt lifted and the bolt pressed, and then mixing to 140-150° C. for debonding with the bolt lifted and the bolt pressed.

[0024] The four-stage mixing includes mixing for 15-60 seconds, mixing with the plug lifted and the plug pressed for 20-40 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135-145° C. for debonding.

[0025] The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

[0026] The third aspect of the present invention provides the use of the track pattern side rubber in the preparation of engineering tracks.

[0027] Preferably, the engineering tracks include tracks for fire trucks, tracks for transporting hazardous chemicals or tracks for agriculture.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects: The track pattern side rubber composition provided by the present invention improves the flame retardancy by partially replacing natural rubber with chloroprene rubber. Chloroprene rubber exhibits excellent flame retardant properties due to the chlorine atoms in its molecular structure, which can effectively curb the combustion process. In addition, antimony trioxide, as a flame retardant, reacts with the chlorine element in chloroprene rubber to generate antimony chloride, which forms a covering layer on the surface of the rubber material, effectively isolating oxygen, and further enhancing the flame retardant effect of the material. In terms of mechanical properties, the addition of white carbon black significantly improves the strength and toughness of the composition. At the same time, antimony trioxide not only acts as a flame retardant, but also improves the dispersibility of white carbon black in the rubber material, allowing the addition amount of white carbon black to be increased, thereby further improving the mechanical properties of the composition. Through this synergistic effect, the track pattern side rubber composition of the present invention not only improves the flame retardancy, but also ensures the maintenance of physical properties, achieving dual optimization of flame retardancy and physical properties.

[0029] The track pattern side rubber provided by the present invention, in view of the advantages of the above-mentioned track pattern side rubber composition, makes the prepared track pattern side rubber have better flame retardancy, wear resistance, aging resistance and tear resistance, is suitable for various harsh working environments, expands the application fields of track pattern side rubber, and promotes the development of related industries.

[0030] The application of the track pattern side rubber provided by the present invention provides better raw materials for preparing fire truck tires, hazardous chemical transport vehicle tires or coal mine underground transport vehicle tires. It releases less toxic gas during combustion, making it an ideal choice in modern society with increasing environmental awareness, and meets the modern tire industry's needs for high performance, high safety and environmental protection. DETAILED DESCRIPTION

[0031] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution in the embodiment of the present invention will be clearly and completely described below in combination with the embodiment of the present invention. Obviously, the described embodiment is a part of the embodiment of the present invention, but not all of the embodiments. The components of the embodiment of the present invention can be arranged and designed in various different configurations.

[0032] It should be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0033] The first aspect of the present invention provides a track pattern side rubber composition, which comprises, by weight: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 25-70 parts of flame retardant, 5-10 parts of activator, 0.5-1.5 parts of activation aid, 1-3 parts of antioxidant, 1-4 parts of vulcanizing agent and 2-4 parts of accelerator; The flame retardant includes antimony trioxide.

[0034] The track pattern side rubber composition provided by the present invention improves the flame retardancy by partially replacing natural rubber with chloroprene rubber. Chloroprene rubber exhibits excellent flame retardant properties due to the chlorine atoms in its molecular structure, which can effectively curb the combustion process. In addition, antimony trioxide, as a flame retardant, reacts with the chlorine element in chloroprene rubber to generate antimony chloride, which forms a covering layer on the surface of the rubber material, effectively isolating oxygen, and further enhancing the flame retardant effect of the material. In terms of mechanical properties, the addition of white carbon black significantly improves the strength and toughness of the composition. At the same time, antimony trioxide not only acts as a flame retardant, but also improves the dispersibility of white carbon black in the rubber material, allowing the addition amount of white carbon black to be increased, thereby further improving the mechanical properties of the composition. Through this synergistic effect, the track pattern side rubber composition of the present invention not only improves the flame retardancy, but also ensures the maintenance of physical properties, achieving dual optimization of flame retardancy and physical properties.

[0035] Chloroprene rubber contains chlorine, which makes it non-self-igniting and self-extinguishing. Chloroprene rubber is a synthetic rubber with excellent flame retardancy. Its molecular structure contains chlorine atoms, which can effectively prevent the spread of combustion. By adjusting the proportion of chloroprene rubber, the purpose of improving flame retardancy can be achieved while avoiding negative impact on other properties.

[0036] Typically but not limiting, the natural rubber content in the composition can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, or any value in the range of 10 to 50 parts; the chloroprene rubber content can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or 90 parts, or any value in the range of 50 to 90 parts; the carbon black content can be 10 parts, 15 parts, 20 parts, 25 parts or 30 parts, or any value in the range of 10 to 30 parts; the white carbon black content can be 5 parts, 7 parts, 10 parts, 12 parts or 15 parts, or any value in the range of 5 to 15 parts; the flame retardant content can be 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts , 55 parts, 60 parts, 65 parts or 70 parts, or any value within the range of 25-70 parts; the content of the activator can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts, or any value within the range of 5-10 parts; the content of the activating aid can be 0.5 parts, 0.7 parts, 0.9 parts, 1.1 parts, 1.3 parts or 1.5 parts, or any value within the range of 0.5-1.5 parts; the content of the antioxidant can be 1 part, 1.5 parts, 2 parts or 3 parts, or any value within the range of 1-3 parts; the content of the vulcanizing agent can be 1 part, 1.5 parts, 2 parts, 2.5 parts, 3 parts or 4 parts, or any value within the range of 1-4 parts; the content of the accelerator can be 2 parts, 2.5 parts, 3 parts or 4 parts, or any value within the range of 2-4 parts.

[0037] Furthermore, the flame retardant also includes tricresyl phosphate and / or chlorinated paraffin. Antimony trioxide is used as a flame retardant, which can react with the chlorine in chloroprene rubber to generate antimony chloride, which covers the surface of the rubber material, blocks the invasion of oxygen, and has excellent flame retardant effect. Chlorinated paraffin is a chlorinated derivative of paraffin, which has both anti-aging and flame retardant properties, and effectively protects the aging properties of the composition while being flame retardant. Antimony trioxide is a highly efficient flame retardant that can promote the carbonization of rubber and form a carbon layer that isolates the air, thereby preventing combustion. Chlorinated paraffin is an organic flame retardant that can cool and isolate oxygen, thereby reducing the possibility of combustion. By accurately controlling the addition amount of these two flame retardants, the purpose of both improving flame retardant properties and reducing environmental pollution can be achieved.

[0038] Furthermore, the activator includes magnesium oxide and / or zinc oxide. Magnesium oxide can be used as a vulcanizing agent, an activating agent, and a filler, and can increase the tensile stress of the vulcanized rubber, and improve the physical properties lost by using chloroprene rubber instead of natural rubber. Because the use of chloroprene rubber slows down the vulcanization speed, the use of magnesium oxide is also conducive to the increase of the vulcanization speed, and because of the presence of magnesium ions, the thermal conductivity of the rubber is increased, and it is not easy to cause heat accumulation, thereby achieving the purpose of flame retardancy.

[0039] The activating aid includes stearic acid.

[0040] Furthermore, the brands of the antioxidant include antioxidant 4020 and / or antioxidant RD.

[0041] The vulcanizing agent includes sulfur.

[0042] The accelerator includes NA-22. Accelerator NA-22 effectively solves the problem that chloroprene rubber is not easy to vulcanize. By selecting an appropriate compounding system, it can be vulcanized quickly and safely. Its vulcanized products have high tensile strength and small permanent compression deformation, effectively ensuring the physical properties of the rubber. The addition amount of accelerator NA-22 is 0.5 to 1.5 parts.

[0043] Typically but not limiting, the amount of accelerator NA-22 added can be 0.5 parts, 0.6 parts, 0.7 parts, 0.8 parts, 0.9 parts, 1.0 parts, 1.1 parts, 1.2 parts, 1.3 parts, 1.4 parts or 1.5 parts, or any value within the range of 0.5 to 1.5 parts.

[0044] Furthermore, the grade of the carbon black includes N234.

[0045] The white carbon black includes vapor deposition white carbon black and precipitation white carbon black.

[0046] The white carbon black has a silicon dioxide content of ≥99.8%, an average particle size of 8-19 nm, a specific surface area of ​​130-400 m² / g, a DBP oil absorption value of 1.5-2 cm³ / g, a relative density of 2.00-2.30 g / cm³, a pH value of 3.9-4.0, and a moisture content of 1.0-1.5%.

[0047] Furthermore, the track pattern side rubber composition comprises, in parts by weight: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 20-60 parts of antimony trioxide, 5-10 parts of chlorinated paraffin, 3-6 parts of zinc oxide, 2-4 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur, and 2-4 parts of accelerator.

[0048] Typically but not limiting, the amounts of the components in the composition can be adjusted within the following ranges: the content of natural rubber can be 10 parts, 15 parts, 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts or 50 parts, or any value within the range of 10-50 parts; the content of chloroprene rubber can be 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts, 80 parts, 85 parts or 90 parts, or any value within the range of 50-90 parts; the content of carbon black can be 10 parts, 15 parts, 20 parts, 25 parts or 30 parts, or any value within the range of 10-30 parts; the content of white carbon black can be 5 parts, 7 parts, 10 parts, 12 parts or 15 parts, or any value within the range of 5-15 parts; the content of antimony trioxide can be 20 parts, 25 parts, 30 parts, 35 parts, 40 parts, 45 parts, 50 parts, 55 parts or 60 parts, or any value within the range of 20 to 60 parts; the content of chlorinated paraffin can be 5 parts, 7 parts, 8 parts, 9 parts or 10 parts, or any value within the range of 5 to 10 parts; the content of zinc oxide can be 3 parts, 4 parts, 5 parts or 6 parts, or any value within the range of 3 to 6 parts; the content of magnesium oxide can be 2 parts, 3 parts or 4 parts, or any value within the range of 2 to 4 parts; the content of stearic acid can be 0.5 parts, 0.75 parts, 1 part or 1.25 parts, or any value within the range of 0.5 to 1.5 parts; the content of antioxidant 4020 can be 1 part, 2 parts or 3 parts, or any value within the range of 1 to 3 parts; the content of sulfur can be 1 part, 2 parts, 3 parts or 4 parts, or any value within the range of 1 to 4 parts; the content of accelerator can be 2 parts, 3 parts or 4 parts, or any value within the range of 2 to 4 parts.

[0049] The second aspect of the present invention provides a track pattern side rubber, which is mainly obtained by mixing the track pattern side rubber composition.

[0050] The track pattern side rubber provided by the present invention, in view of the advantages of the above-mentioned track pattern side rubber composition, makes the prepared track pattern side rubber have better flame retardancy, wear resistance, aging resistance and tear resistance, is suitable for various harsh working environments, expands the application fields of track pattern side rubber, and promotes the development of related industries.

[0051] Further, the mixing comprises the following steps: A. Mix white carbon black and antimony trioxide and disperse them uniformly to obtain a suspension; then mix the suspension with natural rubber to obtain a first masterbatch.

[0052] B. Mix the other raw materials except the vulcanizer and the accelerator, and perform two-stage mixing to obtain the second masterbatch.

[0053] C. Adding the first masterbatch to the second masterbatch and performing three-stage mixing and four-stage mixing to obtain a third masterbatch.

[0054] D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track pattern side rubber.

[0055] Since there is a large amount of white carbon black in the formula, it is difficult to disperse during mixing. The method of preparing antimony trioxide white carbon black masterbatch is adopted to effectively solve the problem of poor dispersion of white carbon black.

[0056] The one-stage mixing process is: mixing the suspension and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber.

[0057] Furthermore, the two-stage mixing includes mixing for 20-60 seconds, mixing with the plug lifted and pressed for 20-35 seconds, and then mixing with the plug lifted and pressed to 150-165° C. for debonding in this order.

[0058] Typically but not restrictively, the two-stage mixing includes mixing in a sequential order, wherein the mixing time may be 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s or 60s; the mixing time for lifting the bolt and pressing the bolt may be 20s, 22s, 24s, 26s, 28s, 30s, 32s, 34s ​​or 35s; then the mixing for lifting the bolt and pressing the bolt may be performed until the temperature reaches 150°C, 151°C, 152°C, 153°C, 154°C, 155°C, 156°C, 157°C, 158°C, 159°C, 160°C, 161°C, 162°C, 163°C, 164°C or 165°C before debinding.

[0059] The three-stage mixing includes mixing for 15-50 seconds, mixing for 15-30 seconds with the bolt lifted and the bolt pressed, and then mixing to 140-150° C. for debonding with the bolt lifted and the bolt pressed.

[0060] Typically but not restrictively, the three-stage mixing includes mixing in a sequential order, wherein the mixing time may be 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s; the mixing time for lifting the bolt and pressing the bolt may be 15s, 18s, 21s, 24s, 27s, 30s; then the mixing is performed by lifting the bolt and pressing the bolt until the temperature reaches 140°C, 142°C, 144°C, 146°C, 148°C, 150°C before degumming.

[0061] The four-stage mixing includes mixing for 15-60 seconds, mixing with the plug lifted and the plug pressed for 20-40 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135-145° C. for debonding.

[0062] Typically but not restrictively, the four-stage mixing includes mixing in a sequential order, wherein the mixing time may be 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s, 55s or 60s; the mixing time for lifting the bolt and pressing the bolt may be 20s, 25s, 30s, 35s, 40s; then the mixing is carried out by lifting the bolt and pressing the bolt until the temperature reaches 135°C, 137°C, 139°C, 141°C, 143°C, 145°C before degumming.

[0063] The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

[0064] Typically but not restrictive, the five-stage mixing includes mixing in a sequential order, wherein the mixing time may be 10s, 15s, 20s, 25s, 30s, 35s, 40s, 45s, 50s; the mixing time for lifting the bolt and pressing the bolt may be 15s, 20s, 25s, 30s; then the mixing is carried out by lifting the bolt and pressing the bolt until the temperature reaches 95°C, 100°C, 105°C, 110°C, 115°C before degumming.

[0065] The third aspect of the present invention provides the use of the track pattern side rubber in the preparation of engineering tracks.

[0066] Preferably, the engineering tracks include tracks for fire trucks, tracks for transporting hazardous chemicals or tracks for agriculture.

[0067] The application of the track pattern side rubber provided by the present invention provides better raw materials for preparing fire truck tires, hazardous chemical transport vehicle tires or coal mine underground transport vehicle tires. It releases less toxic gas during combustion, making it an ideal choice in modern society with increasing environmental awareness, and meets the modern tire industry's needs for high performance, high safety and environmental protection.

[0068] In conjunction with the examples, some embodiments of the present invention are described in detail below. In the absence of conflict, the following examples and features in the examples can be combined with each other. The raw materials used in the examples and comparative examples of the present invention, if no specific conditions are specified, are carried out under normal conditions or conditions recommended by the manufacturer. The reagents or instruments used, if the manufacturer is not specified, are all conventional products that can be purchased commercially.

[0069] The silica used in the following examples and comparative examples is the deposited silica supplied by Quecheng Silicon Chemical Co., Ltd.; the accelerator DM is provided by LANXESS Chemical, and the accelerator CZ is provided by LANXESS Chemical.

[0070] Example 1 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0071] Example 2 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 70 parts of chloroprene rubber, 30 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0072] Example 3 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 50 parts of antimony trioxide, 20 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0073] Example 4 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 20 parts of carbon black N234, 10 parts of white carbon black, 3 parts of microcrystalline wax, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0074] Example 5 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 47 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0075] Example 6 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 9 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0076] Example 7 This embodiment provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 9 parts of magnesium oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0077] Example 8 This embodiment provides a track pattern side rubber, which is obtained by mixing a composition. The formula of the composition is exactly the same as that of Example 1, but the mixing method is different.

[0078] Comparative Example 1 This comparative example provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 50 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ (without antimony trioxide).

[0079] Comparative Example 2 This comparative example provides a track pattern side rubber, which is obtained by mixing the following composition: 100 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N23425 parts, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ (without chloroprene rubber).

[0080] Comparative Example 3 This comparative example provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 18 parts of carbon black N234, 20 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0081] Comparative Example 4 This comparative example provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 35 parts of carbon black N234, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 4 parts of magnesium oxide, 5 parts of zinc oxide, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0082] Comparative Example 5 This comparative example provides a track pattern side rubber, which is obtained by mixing the following composition: 80 parts of chloroprene rubber, 20 parts of natural rubber, 40 parts of antimony trioxide, 25 parts of carbon black N234, 10 parts of white carbon black, 7 parts of chlorinated paraffin, 1 part of stearic acid, 1 part of antioxidant 4020, 2 parts of sulfur, 0.5 parts of accelerator NA-22, 1 part of accelerator DM, and 1.5 parts of accelerator CZ.

[0083] Preparation Example 1 The preparation methods of Examples 1-7 and Comparative Examples 2-5 are as follows: 1. First, place white carbon black and antimony trioxide in a stirring kettle and stir them evenly to prepare antimony trioxide white carbon black pre-dispersed suspension, and then mix the suspension with natural rubber to prepare the first masterbatch, which is reserved for later use.

[0084] The specific process of the first stage mixing is: add antimony trioxide and white carbon black pre-dispersed suspension and half of the natural rubber into the internal mixer, control the speed at 40-55rpm, mix for 20-60s, lift the plug and add the remaining natural rubber, press the plug and mix for 20-50s, mix to 150-165℃, and discharge the rubber.

[0085] 2. The remaining raw materials, except the vulcanizer and the accelerator, are mixed in two stages to prepare the second masterbatch.

[0086] The specific process of the two-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 20~60s, the plug is lifted and pressed for mixing for 20~35s, and then the plug is lifted and pressed for mixing to 150~165℃ and the glue discharge is carried out at 40~55 rpm.

[0087] 3. The first masterbatch prepared in step 1 is added to the second masterbatch, and the mixture is mixed in three stages and four stages to obtain the third masterbatch.

[0088] The specific process of the three-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 15~50s, the plug is lifted and pressed to mix for 15~30s, and then the plug is lifted and pressed to mix until the temperature reaches 140~150℃ for degumming.

[0089] The specific process of the four-stage mixing is: the rotation speed is controlled at 40~55rpm, mixing is carried out in sequence for 15~60s, mixing with the plug lifted and the plug pressed for 20~40s, and then mixing with the plug lifted and the plug pressed until the temperature reaches 135~145℃ for degumming.

[0090] 4. Add vulcanizing agent and accelerator to the third masterbatch and mix them in five stages to obtain the track pattern side rubber.

[0091] The specific process of the five-stage mixing is: the rotation speed is controlled at 20-35 rpm, mixing is carried out in sequence for 10-50 s, the plug lifting and pressing mixing is carried out for 15-30 s, and then the plug lifting and pressing mixing is carried out to 95-115°C for degumming.

[0092] Preparation Example 2 The preparation methods of Example 8 and Comparative Example 1 are as follows: 1. One-stage mixing: The raw materials other than the vulcanizing agent and the accelerator are mixed in one stage. The specific process of the one-stage mixing is that the rotation speed is controlled at 40-55 rpm, and the mixing is carried out in sequence for 30-70 seconds, the plug is lifted and pressed, and the mixing is carried out for 20-35 seconds, and then the plug is lifted and pressed, and the mixing is carried out to 150-165°C and the rubber discharge is 40-55 rpm to obtain a mixed rubber.

[0093] 2. Second stage mixing: the rotation speed is controlled at 40-55 rpm, the first stage mixed rubber is mixed in sequence for 15-50 s, the plug is lifted and pressed for mixing for 15-30 s, and then the plug is lifted and pressed for mixing until the temperature is 140-150 ℃ for rubber discharge to obtain the second stage mixed rubber.

[0094] 3. Vulcanization stage: Add vulcanizing agent and accelerator to the above two-stage mixed rubber, control the speed at 20-35rpm, mix for 10-50s, remove the plug and mix for 15-30s, then remove the plug and mix until the temperature is 95-115℃ to discharge the rubber, and obtain the final mixed rubber.

[0095] Test Example 1 The track pattern side rubber obtained in the embodiment and the comparative example was subjected to performance tests.

[0096] Including: 300% elongation stress M300 is carried out in accordance with the provisions of GB / T528-1998; tensile strength TB is carried out in accordance with the provisions of GB / T528-1998; elongation at break EB% is carried out in accordance with the provisions of GB / T528-1998; hardness is carried out in accordance with the provisions of GB / T531.1-2008.

[0097] The flame retardant performance was tested by Qingdao Sinochem New Materials Laboratory, a third-party testing agency, and the testing method was carried out in accordance with the provisions of MT / T113-1995.

[0098] The obtained data are shown in Tables 1 and 2 below.

[0099] Table 1

[0100] Table 2

[0101] It can be seen from the embodiment and the comparative example that the physical properties and flame retardant properties of the embodiment have a good balance, ensuring both flame retardant properties and physical properties, while the physical properties of the comparative example are similar to those of the embodiment, but its flame retardant properties are poor. Compared with the prior art, the present invention has obvious and positive progress. The tire prepared by the present invention has the characteristics of high performance and high flame retardancy, which greatly improves the service life of the tire.

[0102] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or replace some or all of the technical features therein by equivalents. However, these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A crawler tread side rubber composition, characterized in that: In parts by weight, the composition comprises: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 25-70 parts of flame retardant, 5-10 parts of activator, 0.5-1.5 parts of activation aid, 1-3 parts of antioxidant, 1-4 parts of vulcanizing agent and 2-4 parts of accelerator; The flame retardant includes antimony trioxide.

2. The crawler tread side rubber composition according to claim 1, characterized in that: The flame retardant further comprises tricresyl phosphate and / or chlorinated paraffin.

3. The crawler tread side rubber composition according to claim 1, characterized in that: The activator comprises magnesium oxide and / or zinc oxide; The activating aid includes stearic acid.

4. The crawler tread side rubber composition according to claim 1, characterized in that: The brands of the antioxidant include antioxidant 4020 and / or antioxidant RD; The vulcanizing agent includes sulfur; The brand of the accelerator includes at least one of NA-22, DM and CZ.

5. The crawler tread side rubber composition according to any one of claims 1 to 4, characterized in that: The grades of the carbon black include N234; The white carbon black includes vapor deposition white carbon black and precipitation white carbon black.

6. The crawler tread side rubber composition according to any one of claims 1 to 4, characterized in that: In parts by weight, the composition comprises: 10-50 parts of natural rubber, 50-90 parts of chloroprene rubber, 10-30 parts of carbon black, 5-15 parts of white carbon black, 20-60 parts of antimony trioxide, 5-10 parts of chlorinated paraffin, 3-6 parts of zinc oxide, 2-4 parts of magnesium oxide, 0.5-1.5 parts of stearic acid, 1-3 parts of antioxidant 4020, 1-4 parts of sulfur, and 2-4 parts of accelerator.

7. A track pattern side rubber, characterized in that: The invention is mainly obtained by mixing the crawler pattern side rubber composition according to any one of claims 1 to 6.

8. The crawler tread side rubber according to claim 7, characterized in that: The mixing comprises the following steps: A. mixing white carbon black and antimony trioxide and dispersing them uniformly to obtain a suspension; then mixing the suspension with natural rubber to obtain a first masterbatch; B. Mixing other raw materials except the vulcanizing agent and the accelerator, and performing two-stage mixing to obtain a second masterbatch; C. adding the first masterbatch to the second masterbatch and mixing them in three stages and four stages to obtain a third masterbatch; D. Adding a vulcanizing agent and an accelerator into the third masterbatch and kneading them in five stages to obtain the track pattern side rubber.

9. The crawler tread side rubber according to claim 8, characterized in that: The mixing process of the first stage is: mixing the suspended matter and part of the natural rubber for 20-60 seconds, adding the plug to the remaining natural rubber plug and mixing for 20-50 seconds, and mixing until the temperature reaches 150-165° C. to discharge the rubber; The two-stage mixing includes mixing for 20-60 seconds, mixing for 20-35 seconds with the bolt lifted and the bolt pressed, and then mixing to 150-165° C. for debonding with the bolt lifted and the bolt pressed; The three-stage mixing includes mixing for 15-50 seconds, mixing for 15-30 seconds with the bolt lifted and the bolt pressed, and then mixing to 140-150° C. for debonding with the bolt lifted and the bolt pressed; The four-stage mixing includes mixing for 15-60 seconds, mixing for 20-40 seconds with the bolt lifted and the bolt pressed, and then mixing until the temperature reaches 135-145° C. for debonding. The five-stage mixing includes mixing for 10-50 seconds, mixing with the plug lifted and the plug pressed for 15-30 seconds, and then mixing with the plug lifted and the plug pressed until the temperature reaches 95-115° C. for debonding.

10. Use of the track pattern side rubber according to any one of claims 7 to 9 in preparing engineering tracks.

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