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Rubber composition for coating crowned layer of radial tire

A technology of rubber composition and radial tire, which is applied in the field of rubber composition coating radial tire cap ply, to achieve the effects of simplifying the production process, good anti-blocking, and improving the mechanical performance and dimensional stability of the shoulder

Active Publication Date: 2019-02-26
PRINX CHENGSHAN (SHANDONG) TIRE COMPANY LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The composition has better adhesion to larger diameter steel cords, so it is suitable for belts with larger steel cords, but not suitable for caps where small diameter steel cords and moderate surface viscosity are required

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] 1) Take 225kg of natural rubber, 3.4kg of binder RE, 2.5kg of cobalt boroacylate (cobalt ion accounts for 0.56kg), 1.2kg of tackifying resin TKM-M, 95kg of N326 carbon black, 15.8kg of zinc oxide, and 1.1kg of stearin Acid, 4.5kg anti-aging agent 6PPD, 5.6kg anti-aging agent RD, 0.21kg pentachlorothiophenol and 3.4kg naphthenic oil and mix evenly, mix at 100°C for 3min at a speed of 30r / min, and control the debinding temperature at 150°C to obtain Mixed Rubber A;

[0039] 2) Add 38.5kg of N326 carbon black to rubber compound A and mix evenly, mix at 100°C for 1.5min at a speed of 45r / min, and control the discharge temperature at 150°C to obtain compound B;

[0040] 3) Add 1.2kg sulfenamide accelerator DCBS, 0.1kg anti-scorch agent CTP, 4.5kg insoluble sulfur, 1.8kg ordinary sulfur and 4.5kg binder RA to the rubber compound B and mix evenly. Knead at a speed of 30 r / min for 1.5 min, and control the discharge temperature at 95° C. to obtain a rubber composition.

Embodiment 2

[0042] 1) Take 206kg natural rubber, 23kg isoprene rubber, 3.4kg binder B-18-S, 2.5kg boroacylated cobalt (cobalt ion accounts for 0.56kg), 3.4kg tackifying resin TKM-M, 94kg N330 carbon black , 16.0kg zinc oxide, 1.2kg stearic acid, 4.6kg anti-aging agent 6PPD, 5.7kg anti-aging agent RD, 0.21kg pentachlorothiophenol and 3.4kg naphthenic oil and mix well, at 80 ℃, at 50r / min Mix at a rotational speed for 2 minutes, and control the discharge temperature at 145°C to obtain compound A;

[0043] 2) Add 39.3kg of N330 carbon black to rubber compound A and mix evenly, mix at 120°C for 2.5min at a speed of 30r / min, and control the discharge temperature at 140°C to obtain compound B;

[0044] 3) Add 1.2kg sulfenamide accelerator DCBS, 0.1kg anti-scorch agent CTP, 6.7kg insoluble sulfur and 4.5kg binder RA to the rubber compound B and mix evenly. Mix at a rotational speed for 2 minutes, and control the debinding temperature at 100° C. to obtain a rubber composition.

Embodiment 3

[0046] 1) Take 229kg of natural rubber, 3.4kg of adhesive SL-3019F, 2.5kg of cobalt boroacylate (cobalt ion accounts for 0.56kg), 2.29kg of tackifying resin TKM-M, 91.6kg of N375 carbon black, 16.0kg of zinc oxide, 1.2kg of stearic acid, 4.6kg of anti-aging agent 6PPD, 5.7kg of anti-aging agent RD, 0.21kg of pentachlorothiophenol and 3.4kg of naphthenic oil were mixed evenly, and mixed at 120°C for 2.5min at a speed of 40r / min. The debinding temperature is controlled at 160°C to obtain compound A;

[0047] 2) Add 38.5kg of N375 carbon black to rubber compound A and mix evenly, mix at 80°C for 2 minutes at a speed of 40r / min, and control the discharge temperature at 145°C to obtain rubber compound B;

[0048] 3) Add 1.2kg sulfenamide accelerator DCBS, 0.1kg anti-scorch agent CTP, 3.3kg insoluble sulfur, 2.7kg ordinary sulfur, 4.5kg binder RA to the rubber compound B and mix evenly, at 60°C, Knead at a speed of 25 r / min for 2 minutes, and control the debinding temperature at 10...

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Abstract

The invention provides a rubber composition for coating a crowned layer of a radial tire, and relates to the field of tire rubber materials. The rubber composition is prepared from a rubber raw material and a binder system, and the binder system is prepared from 0.1 to 6 parts by weight of a resorcinol diphenolic binder, 1 to 15 parts by weight of a methyl donor binder, 0.1 to 6 parts by weight ofwhite carbon black and cobalt salt containing 0.01 to 2 parts by weight of cobalt. The rubber composition provided by the invention is extremely high in strike-through, fluidity and rubber rigidity,and the rubber composition-coated crowned layer of the radial tire has a relatively moderate surface viscosity, which can guarantee the stickiness during bonding and also can achieve an extremely goodanti-blocking effect. The crowned layer can be wound directly in actual production and preparation, and interzonal isolation can be realized without using a fiber or polyethylene film patch, which prevents the surface of the crowned layer from being externally contaminated and then affecting the surface viscosity, reduces the production cost, simplifies the production flow and improves the production efficiency.

Description

technical field [0001] The invention relates to the field of tire rubber materials, in particular to a rubber composition used for coating a crown layer of a radial tire. Background technique [0002] The cap layer inside the radial tire plays the role of restraining the belt layer, enhancing the mechanical properties and dimensional stability of the shoulder of the radial tire. The steel cord crown strip with an angle of 0° can be applied to truckbus radial tires (TBR). The rubber material used to coat the steel cord itself and the cord must have good adhesion and adhesion rate, so as to ensure the quality of the obtained cap belt used in radial tires. [0003] After the cord of the cap layer is coated with the rubber coating, it relies on its surface to bond the crown and the belt layer. When the surface is dry or the viscosity is poor, the cap layer is easily separated from other parts. Subsequent pressure roller rolling process or during the use of tires will cause dis...

Claims

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Application Information

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IPC IPC(8): C08L7/00C08L9/00C08L91/00C08K3/36C08K5/55C08K3/22C08K5/09C08K3/06
CPCC08K2003/2296C08L7/00C08L9/00C08L91/00C08K3/36C08K5/55C08K3/22C08K5/09C08K3/06
Inventor 谭建良许建欣孙蕾郭星
Owner PRINX CHENGSHAN (SHANDONG) TIRE COMPANY LTD
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