Application of lignin in preparation of radial tires

A radial tire and lignin technology, applied in special tires, tire parts, transportation and packaging, etc., can solve the problems of endangering the health of workers, easy sublimation of resorcinol, environmental pollution, etc., to improve various performances, Effect of improving thermo-oxidative aging properties

Active Publication Date: 2020-10-09
NANJING TECH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, resorcinol is generally used in the compound formula of radial tire carcass. Although its effect is good, resorcinol is easy to sublime during high temperature mixing process, which will cause resorcinol to volatilize and smoke. Contains certain toxicity
Therefore, using resorcinol as a raw material to prepare radial tires not only brings serious environmental pollution to processes such as rubber mixing, but also endangers the health of workers.
In the prior art, in order to solve technical problems, meta-cresol is usually used to replace resorcinol, but the performance of the radial tire prepared by adopting meta-cresol will decline, and it cannot reach the level equivalent to resorcinol. Effect

Method used

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  • Application of lignin in preparation of radial tires
  • Application of lignin in preparation of radial tires
  • Application of lignin in preparation of radial tires

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Basic formula: 100 parts of natural rubber; filler: 55 parts of carbon black N234; antioxidant: 0.3 parts of RD, 1 part of 40201; 10 parts of zinc oxide; adhesion promoter: 1 part of cobalt caprate; vulcanizing agent: 6 parts of sulfur OT20 Adhesive: 4 parts of RA-65; Vulcanization accelerator: 2 parts of MBTS (DM), which also contains resorcinol-80 and enzymatic lignin, the amount of both is shown in Table 1.

[0041] The preparation process is as follows:

[0042](1) One stage of mastication: according to the formula ratio, place the natural rubber in the mixing chamber of the internal mixer to press the weight for 40 seconds, the temperature of the rubber material is 160-170°C, and the rubber is discharged; the rotor speed is 50rpm, and the pressure is 0.7MPa;

[0043] (2) Two-stage mixing: the plasticized rubber obtained in step (1), filler, anti-aging agent, zinc oxide, adhesive, adhesion promoter and resorcinol, or enzymatically decomposed lignin and resorcinol ...

Embodiment 2

[0051] Example 2: Same as Example 1-2, only the enzymatic lignin is air-pulverized to different particle sizes, and the test results are shown in Table 2.

[0052] Table 2

[0053]

[0054] Note: The above particle size refers to d50.

[0055] It can be seen from Table 2 that the performance of the product is better as the particle size of lignin decreases; among them, when the particle size of lignin exceeds 8 μm, the performance drops significantly; when the particle size of lignin is 1.8 μm When the particle size of lignin is 3.8 μm, its performance is the best; when the particle size of lignin is 3.8 μm, its overall performance is not much different from that of 1.8 μm; in the course of the experiment, if the lignin is airflow crushed to 1.8 μm, every The hourly output is low and the energy consumption is high. Therefore, from the perspective of cost and performance, generally speaking, the particle size of lignin can be selected to be 1-5 μm.

Embodiment 3

[0057] 3.1 Same as Example 1-2, only the enzymatic lignin in 1-2 in the embodiment is replaced by alkali lignin (3-1), soda lignin (3-2), organic solvent lignin (acetic acid lignin prime) (3-3), the test results are shown in Table 5.

[0058] 3.2 Same as in Example 1-5, except that the enzymatic lignin in Example 1-5 was replaced with acetate lignin (3-4), the test results are shown in Table 3.

[0059] table 3

[0060]

[0061] As can be seen from Table 3, lignin acetate can effectively replace resorcinol, and after 5 parts of lignin acetate replaces 1 part of resorcinol, its tensile strength at break can be compared with that of Example 1-1 (completely resorcinol Diphenol, without lignin replacement) at the same level, and other properties are also better than Example 1-1, especially the steel drawing performance reaches 732N / mm, thereby opening up a new method for preparing radial tires.

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Abstract

The invention belongs to the field of rubber tire processing, and particularly discloses an application of lignin in preparation of radial tires. The lignin can completely or partially replace resorcinol, and meanwhile, the lignin can completely or partially replace an anti-aging agent. Compared with the prior art, resorcinol is replaced or partially replaced by biomass-derived lignin or modifiedlignin, so that the requirements of cost reduction, environmental protection and no toxicity are met. Especially, the demethylated modified lignin can effectively enhance various properties of the rubber. In addition, lignin is used as a thermo-oxidative aging agent to improve the thermo-oxidative aging performance of rubber products, and the aging change rate is obviously lower than that of radial tires without lignin.

Description

technical field [0001] The invention belongs to the field of rubber tire processing and relates to the application of lignin in preparing radial tires. Background technique [0002] As an important part of automobiles, tires are the basis for the development of the automobile industry. As an important supporting industry for the automobile industry, the tire industry is closely related to my country's economic development. In the past five years, the sales volume of China's auto tire market has grown strongly at a compound annual growth rate of 9.1%, from 396.0 million units in 2012 to 561.2 million units in 2016. Among them, the sales volume of all-steel radial tires, semi-steel radial tires and bias tires grew at a compound annual growth rate of 2.1%, 13.5% and -0.3%, respectively. It is predicted that by 2021, the sales volume of semi-steel radial tires will reach 594.5 million units, with a compound annual growth rate of 8.8%; the sales volume of all-steel radial tires...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L7/00C08L97/00C08K13/02C08K5/13C08K3/04C08K3/22B60C1/00
CPCC08L7/00B60C1/0016C08L2201/08C08K2003/2296C08L97/005C08K13/02C08K5/13C08K3/04C08K3/22B60C1/00B60C1/0041
Inventor 朱晨杰应汉杰李明欧阳平凯沈建农徐新建庄伟沈涛
Owner NANJING TECH UNIV
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