Snowfield light truck tire

Abstract

The invention relates to the technical field of tires, and discloses a snowfield light truck tire. The tire adopts a double-layer tread design, the upper tread rubber adopts a special extremely cold region formula design and an ultra-low hardness design, the glass transition temperature Tg is lower than-50 DEG C, and the hardness is 48-56; the lower tread rubber adopts a low glass transition temperature design and a medium hardness design, the glass transition temperature Tg is lower than-45 DEG C, and the hardness is 60-70. By means of the design, the tire can provide shorter braking distance and better road holding force when running on the snowfield, and meanwhile the high speed and durability of the tire are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of tires, in particular to a snow light truck tire. Background Art

[0002] In the northern part of China, winter is cold for a long time, with a lot of snow and ice. In order to ensure driving safety, cars must be replaced with winter snow tires with better grip and better cold resistance. In order to ensure the operation of urban life, they are used very frequently, so there is a great demand for safe snow tires. When the existing ordinary snow tires are used in the snow, the snow and snow water on the tire tread are not easy to discharge, the snow discharge performance is weak, the tire grip is weak, and it is easy to slip, which poses a great safety hazard. Therefore, the tires must have good performance and traction characteristics on snowy roads. Compared with ordinary tires, light truck winter tires are very different in tire pattern and material design. They are specially designed for snowy and slippery roads in winter. Winter light truck tires can provide wheels with shorter braking distances and better grip when driving on snow.

[0003] The tread and shoulder structure of traditional light truck snow tires ( Figure 1 ) is mainly composed of three compounds, namely, tread rubber, base rubber and shoulder rubber. The tread is responsible for braking and wear resistance, handling comfort performance, snow and water drainage performance; the base rubber is responsible for modulus transition and molding viscosity, reducing heat generation; the shoulder rubber is responsible for flexibility at the shoulder. The tread pattern of snow light truck tires in the prior art has large deformation of the pattern blocks under a certain load, and the ground contact mark is deformed. If the design is improper, it will not be able to achieve good water drainage and snow drainage performance and high-speed handling performance, and the handling performance on ice and snow roads will deteriorate, which will cause greater fuel loss. Therefore, the present invention adopts a four-compound type ( Figure 2 ), the upper tread should maintain good flexibility at low temperatures to ensure that the tire has good snow grip performance, and the lower tread layer must have sufficient rigidity to ensure that the tire has good durability. Summary of the invention

[0004] In view of the deficiencies of the prior art, the present invention provides a snow light truck tire, which has a shorter braking distance and better grip, while ensuring high-speed durability.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical solutions: A snow light truck tire, the tire comprising a tread, a sidewall and a shoulder, the shoulder connecting the tread and the sidewall, that is, the shoulder is arranged on both lateral sides of the tread; the tread is composed of an upper tread rubber, a lower tread rubber and a base rubber in order from top to bottom, the shoulder is composed of a shoulder wing rubber, the upper tread rubber adopts a special extremely cold region formula design and an ultra-low hardness design, the glass transition temperature Tg is lower than -50°C, and the hardness is 48-56; the lower tread rubber adopts a low glass transition temperature design and a medium hardness design, the glass transition temperature Tg is lower than -45°C, and the hardness is 60-70; the shoulder wing rubber adopts a medium-low hardness design, and the hardness is 54-58; the base rubber adopts a hardness design similar to or slightly higher than that of the lower tread rubber, generally 1-2 hardness values ​​higher, and belongs to the transition of the modulus between the tread and the cap layer and the bonding transition between the tread and the cap layer, and needs to have a higher tear resistance, so the design is mainly natural rubber; The upper tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 30-60phr, Polyisoprene rubber 10-30phr, Cis-butadiene rubber 30-40phr, Highly dispersed white carbon black 20-40phr, SI69 silanized coupling agent 1.6-3.2phr, Super wear-resistant or high wear-resistant carbon black 15-25phr, Hard clay or ultrafine diatomaceous earth 10-20phr, Soybean oil 15-25phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer, wherein the SI69 silanization coupling agent is added in an amount of 8% of highly dispersed white carbon black, the white carbon black BET specific surface area is 150-170m2 / g, and the carbon black particle size is 30-40nm; Among them, hard clay or ultrafine diatomaceous earth provides tires with ice and snow grip performance and increases ice-breaking ability, and soybean oil as a softener provides better low-temperature performance; The lower tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 50-80phr, Styrene butadiene rubber 1500 10-20phr, Cis-butadiene rubber 20-40phr Highly dispersed white carbon black 10-20phr, Super wear-resistant or high wear-resistant carbon black 30-50phr, Environmentally friendly aromatic oil 3-8phr, and an appropriate amount of rubber activator, rubber antioxidant and rubber vulcanizer, the carbon black particle size is 20-40nm, and the BET specific surface area of ​​the highly dispersed white carbon black is 150-170m 2 / g; The base rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 50-80phr, Styrene butadiene rubber 10-25phr, Cis polybutadiene rubber 10-25phr, High wear-resistant carbon black 40-50phr, Environmentally friendly aromatic oil 2-6phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer, wherein the carbon black particle size is 20-40 nm; The shoulder wing rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 40-60phr, Cis polybutadiene rubber 40-60phr, High wear-resistant carbon black 35-45phr or fast extrusion carbon black 40-55phr, Environmentally friendly aromatic oil 5-10phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer. The carbon black particle size is 20-40nm; the high wear-resistant carbon black is N330 or N375, and the fast extrusion carbon black is N550.

[0006] Preferably, the glass transition temperature Tg of the upper tread rubber is -50°C to -60°C, and the hardness is 50-54; the glass transition temperature Tg of the lower tread rubber is -45°C to -55°C, and the hardness is 64-68.

[0007] Preferably, the upper tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 30-60phr, Polyisoprene rubber 10-30phr, Cis-butadiene rubber 30-40phr, Highly dispersed white carbon black 20-40phr, SI69 silanized coupling agent 1.8-3.0phr, Super wear-resistant or high wear-resistant carbon black 18-22phr, Hard clay or ultrafine diatomaceous earth 13-17phr, Soybean oil 18-22phr, Rubber activator 2.5-5.5phr, Rubber antioxidant 4.0-8.5phr, Rubber vulcanizing agent 2.2-6.0phr.

[0008] Preferably, the raw materials of the upper tread rubber include: rubber activators including 1.5-3.5 phr of zinc oxide and 1.0-2.0 phr of stearic acid; rubber antioxidants including 2.0-3.5 phr of antioxidant 6PPD, 1.0-2.0 phr of microcrystalline wax and 1.0-3.0 phr of TMQ; and rubber vulcanizers including 1.0-3.0 phr of sulfur, 1.0-2.5 phr of accelerator NS and 0.2-0.5 phr of accelerator DM.

[0009] Preferably, among the raw materials of the lower tread rubber: the rubber activator mainly adopts zinc oxide 2-3phr and stearic acid 1.0-2.0phr; the rubber antioxidant adopts antioxidant 6PPD 1-2phr, microcrystalline wax 1.0-2.0phr, TMQ 1.0-2.0phr; the rubber vulcanizer adopts sulfur 1.0-3.0phr, sulfonamide accelerator NS or CZ 0.5-1.5phr and scorch retarder CTP 0-0.3phr.

[0010] Preferably, among the raw materials of the base rubber: the rubber activator mainly adopts zinc oxide 1.5-2.5phr and stearic acid 1.0-2.0phr; the rubber antioxidant adopts antioxidant 6PPD 0.5-1.5phr and TMQ 0.5-1.5phr; the rubber vulcanizing agent adopts insoluble sulfur OT20 2.0-4.0phr, sulfonamide accelerator NS or CZ 0.5-1.2phr and anti-scorch agent CTP 0.1-0.3phr, wherein the insoluble sulfur can prevent sulfur blooming from affecting the molding viscosity.

[0011] Preferably, among the raw materials of the tire shoulder wing rubber: the rubber active agent mainly adopts zinc oxide 2.0-3.0phr and stearic acid 1.0-2.0phr; the tire shoulder is involved in more flexural strain, so the combination of rubber antioxidants is very important, and the rubber antioxidant adopts antioxidant 6PPD 2.0-4.0phr, TMQ 1.0-2.0phr and microcrystalline wax 1.2-1.8phr; the rubber vulcanizer adopts sulfur powder 1.0-2.0phr and sulfonamide accelerator NS 0.5-1.2phr.

[0012] Preferably, the upper tread rubber contains a relatively high content of white carbon black and silane coupling agent, and thus needs to be mixed at a constant temperature of 140-145° C. for more than 120 seconds.

[0013] Preferably, the upper tread rubber is prepared by mixing in an intermeshing type tandem internal mixer, and the lower tread rubber, base rubber and shoulder wing rubber are prepared by mixing in a conventional tangent type internal mixer.

[0014] The tire tread of the present invention adopts a double-layer tread design, the upper tread adopts a low glass transition temperature and ultra-low hardness design, and the lower tread adopts a low glass transition temperature and medium hardness design, which can allow the tire to provide a shorter braking distance and better grip when driving on snow, while ensuring the high speed and durability of the tire.

[0015] Hard clay or ultra-fine diatomaceous earth is added to the upper tread rubber to increase the tire's ice-breaking ability and improve the tire's grip on ice and snow; soybean oil is added as a softener to enable the upper tread to better maintain low-temperature performance.

[0016] The medium hardness of the lower tread can provide support when the tire is running, and is also beneficial to improving the tire's durability and dry and wet braking performance; the lower tread rubber is made of a composite of natural rubber, styrene-butadiene rubber, and butadiene rubber, which has a good modulus transition with the base rubber; the added silica is beneficial to suppressing the rapid increase in low-temperature modulus. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of a three-composite tread and shoulder structure.

[0018] Figure 2 It is a schematic diagram of a four-composite tread and shoulder structure. DETAILED DESCRIPTION

[0019] The following is a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0020] Example 1 A snow truck tire is provided, the tire comprising a tread, a sidewall and a shoulder, the shoulder connecting the tread and the sidewall, that is, the shoulder is arranged on both lateral sides of the tread. Figure 2 As shown, the tread is composed of an upper tread rubber 11, a lower tread rubber 12 and a base rubber 2 in order from top to bottom, and the shoulder is composed of a shoulder wing rubber 3. The glass transition temperature Tg of the upper tread rubber 11 is lower than -50°C, and the hardness is 48-56; the glass transition temperature Tg of the lower tread rubber 12 is also lower than -45°C, and the hardness is 60-70; the hardness of the shoulder wing rubber is 54-58;.

[0021] The upper tread rubber 11 is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: 45 phr of natural rubber, 20 phr of polyisoprene rubber, 35 phr of cis-butadiene rubber, 30 phr of highly dispersed white carbon black, 2.4 phr of SI69 silanization coupling agent, 20 phr of carbon black N330, 15 phr of ultrafine diatomaceous earth, 20 phr of soybean oil, 2.0 phr of zinc oxide, 1.5 phr of stearic acid, 2.5 phr of antioxidant 6PPD, 1.5 phr of microcrystalline wax, 2.0 phr of TMQ, 2.0 phr of sulfur, 1.5 phr of accelerator NS, and 0.4 phr of accelerator DM.

[0022] Among them, the BET specific surface area of ​​white carbon black is 160m 2 / g, and the carbon black particle size is 35nm.

[0023] The lower tread rubber 12 is prepared by mixing the raw materials including the following components based on 100 parts by weight of raw rubber: 55 phr of natural rubber, 15 phr of styrene-butadiene rubber 1500, 30 phr of cis-butadiene rubber, 10 phr of highly dispersed white carbon black, 40 phr of carbon black N375, 5 phr of environmentally friendly aromatic oil, 2.5 phr of zinc oxide, 1.5 phr of stearic acid, 1.5 phr of antioxidant 6PPD, 1.5 phr of microcrystalline wax, 1.5 phr of TMQ, 1.5 phr of sulfur, 1.0 phr of sulfonamide accelerator NS, and 0.15 phr of scorch retarder CTP.

[0024] Among them, the carbon black particle size is 30nm, and the BET specific surface area of ​​highly dispersed white carbon black is 160m 2 / g.

[0025] The base rubber 2 is prepared by mixing the raw materials including the following components based on 100 parts by weight of raw rubber: 65 phr of natural rubber, 15 phr of styrene-butadiene rubber, 20 phr of cis-polybutadiene rubber, 45 phr of carbon black N330, 4 phr of environmentally friendly aromatic oil, 2.0 phr of zinc oxide, 1.5 phr of stearic acid, 1.0 phr of antioxidant 6PPD, 1.0 phr of TMQ, 3.0 phr of insoluble sulfur OT20, 0.8 phr of sulfonamide accelerator NS, and 0.2 phr of scorch retarder CTP.

[0026] Among them, the carbon black particle size is 30nm.

[0027] The shoulder wing rubber 3 is prepared by mixing the raw materials including the following components based on 100 parts by weight of raw rubber: 50 phr of natural rubber, 50 phr of cis-polybutadiene rubber, 45 phr of carbon black N550, 8 phr of environmentally friendly aromatic oil, 2.5 phr of zinc oxide, 1.5 phr of stearic acid, 3.0 phr of antioxidant 6PPD, 1.5 phr of TMQ, 1.5 phr of microcrystalline wax, 1.5 phr of sulfur powder, and 0.8 phr of sulfonamide accelerator NS.

[0028] Among them, the carbon black particle size is 30nm.

[0029] The rubber composition is mixed and kneaded to prepare the tire tread, base and shoulder rubber, and then the tire is prepared. The obtained tire has a tread rubber glass transition temperature Tg of -50-60°C and a hardness of 52; a lower tread rubber glass transition temperature Tg of 45-55°C and a hardness of 66; a shoulder wing rubber hardness of 56; and a base rubber hardness of 68.

[0030] Comparative Example 1 The difference from Example 1 is that the upper tread rubber hardness is 57.

[0031] Comparative Example 2 The difference from Example 1 is that the lower tread rubber hardness is 71.

[0032] Reference example Ordinary snow tire structure, the tread hardness is the tread rubber hardness of Example 1.

[0033] Taking 205 / 55R16 91H grade tire as an example, the design performance of the embodiment, comparative example and reference example was tested. The results are shown in Table 1.

[0034] Table 1 Reference example Example 1 Comparative Example 1 Comparative Example 2 Single-ply tread 54 / / / Upper tread hardness / 52 57 52 Lower tread hardness / 66 66 71 Base glue hardness 64 68 68 68 Shoulder wing rubber hardness / 56 56 56 Snow braking distance / m 21 18 23 22 Wet braking distance / m 35 31 32 31 High speed performance ECER30 time 63 minutes 70 minutes 74 minutes 68 minutes Durability / hour (load increases by 10% every 10 hours after 34 hours, 100% load constant until failure) 65 72 75 68 The above is a description of the embodiments of the present invention. Through the above description of the disclosed embodiments, professionals and technicians in the field can implement or use the present invention. Various modifications to these embodiments will be apparent to professionals and technicians in the field. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown in this article, but will conform to the widest range consistent with the principles and novelties disclosed herein.

Claims

1. A snow light truck tire, comprising a tread, a sidewall and a shoulder, wherein the shoulder connects the tread and the sidewall, that is, the shoulder is arranged on both lateral sides of the tread; the tread is composed of an upper tread rubber, a lower tread rubber and a base rubber in sequence from top to bottom, and the shoulder is composed of a shoulder wing rubber, characterized in that: The glass transition temperature Tg of the upper tread rubber is lower than -50℃, and the hardness is 48-56; the glass transition temperature Tg of the lower tread rubber is also lower than -45℃, and the hardness is 60-70; the hardness of the shoulder wing rubber is 54-58; the hardness of the base rubber is 1-2 hardness values ​​higher than that of the lower tread rubber; The upper tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 30-60phr, Polyisoprene rubber 10-30phr, Cis-butadiene rubber 30-40phr, Highly dispersed white carbon black 20-40phr, SI69 silanized coupling agent 1.6-3.2phr, Super wear-resistant or high wear-resistant carbon black 15-25phr, Hard clay or ultrafine diatomaceous earth 10-20phr, Soybean oil 15-25phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer. The amount of SI69 silanization coupling agent added is 8% of highly dispersed white carbon black, and the BET specific surface area of ​​white carbon black is 150-170m 2 / g, carbon black particle size is 30-40nm; The lower tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 50-80phr, Styrene butadiene rubber 1500 10-20phr, Cis-butadiene rubber 20-40phr Highly dispersed white carbon black 10-20phr, Super wear-resistant or high wear-resistant carbon black 30-50phr, Environmentally friendly aromatic oil 3-8phr, and an appropriate amount of rubber activator, rubber antioxidant and rubber vulcanizer, the carbon black particle size is 20-40nm, and the BET specific surface area of ​​the highly dispersed white carbon black is 150-170m 2 / g; The base rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 50-80phr, Styrene butadiene rubber 10-25phr, Cis polybutadiene rubber 10-25phr, High wear-resistant carbon black 40-50phr, Environmentally friendly aromatic oil 2-6phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer, wherein the carbon black particle size is 20-40 nm; The shoulder wing rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 40-60phr, Cis polybutadiene rubber 40-60phr, High wear-resistant carbon black 35-45phr or fast extrusion carbon black 40-55phr, Environmentally friendly aromatic oil 5-10phr, and appropriate amounts of rubber activator, rubber antioxidant and rubber vulcanizer. The carbon black particle size is 20-40nm; the high wear-resistant carbon black is N330 or N375, and the fast extrusion carbon black is N550.

2. The tire according to claim 1, characterized in that The glass transition temperature Tg of the upper tread rubber is -50°C to -60°C, and the hardness is 50-54; the glass transition temperature Tg of the lower tread rubber is -45°C to -55°C, and the hardness is 64-68.

3. The tire according to claim 1, characterized in that The upper tread rubber is prepared by mixing the following raw materials based on 100 parts by weight of raw rubber: Natural rubber 30-60phr, Polyisoprene rubber 10-30phr, Cis-butadiene rubber 30-40phr, Highly dispersed white carbon black 20-40phr, SI69 silanized coupling agent 1.8-3.0phr, Super wear-resistant or high wear-resistant carbon black 18-22phr, Hard clay or ultrafine diatomaceous earth 13-17phr, Soybean oil 18-22phr, Rubber activator 2.5-5.5phr, Rubber antioxidant 4.0-8.5phr, Rubber vulcanizing agent 2.2-6.0phr.

4. The tire according to claim 1 or 3, characterized in that The raw materials of the upper tread rubber include: the rubber activator includes 1.5-3.5 phr of zinc oxide and 1.0-2.0 phr of stearic acid; the rubber antioxidant includes 2.0-3.5 phr of antioxidant 6PPD, 1.0-2.0 phr of microcrystalline wax and 1.0-3.0 phr of TMQ; the rubber vulcanizer includes 1.0-3.0 phr of sulfur, 1.0-2.5 phr of accelerator NS and 0.2-0.5 phr of accelerator DM.

5. The tire according to claim 1, characterized in that The raw materials of the lower tread rubber include: the rubber activator mainly includes 2-3 phr of zinc oxide and 1.0-2.0 phr of stearic acid; the rubber antioxidant includes 1-2 phr of antioxidant 6PPD, 1.0-2.0 phr of microcrystalline wax and 1.0-2.0 phr of TMQ; the rubber vulcanizer includes 1.0-3.0 phr of sulfur, 0.5-1.5 phr of sulfonamide accelerator NS or CZ and 0-0.3 phr of scorch retarder CTP.

6. The tire according to claim 1, characterized in that The raw materials of the base rubber include: the rubber activator mainly includes 1.5-2.5 phr of zinc oxide and 1.0-2.0 phr of stearic acid; the rubber antioxidant includes 0.5-1.5 phr of antioxidant 6PPD and 0.5-1.5 phr of TMQ; the rubber vulcanizer includes 2.0-4.0 phr of insoluble sulfur OT20, 0.5-1.2 phr of sulfonamide accelerator NS or CZ and 0.1-0.3 phr of anti-scorch agent CTP.

7. The tire according to claim 1, characterized in that The raw materials of the tire shoulder wing rubber include: the rubber activator mainly includes 2.0-3.0 phr of zinc oxide and 1.0-2.0 phr of stearic acid; the rubber antioxidant includes 2.0-4.0 phr of antioxidant 6PPD, 1.0-2.0 phr of TMQ and 1.2-1.8 phr of microcrystalline wax; the rubber vulcanizer includes 1.0-2.0 phr of sulfur powder and 0.5-1.2 phr of sulfonamide accelerator NS.

8. The tire according to claim 1, 3 or 4, characterized in that: The upper tread rubber is mixed at a constant temperature of 140-145° C. for more than 120 seconds.

9. The tire according to claim 1, characterized in that The upper tread rubber is prepared by mixing in a meshing type series internal mixer, and the lower tread rubber, base rubber and shoulder wing rubber are prepared by mixing in a conventional tangent type internal mixer.

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