Anti-aging epoxidized natural rubber and preparation method thereof

A technology of natural rubber and epoxidation, which is applied to the field of aging-resistant epoxidized natural rubber and its preparation, can solve the problems of short service life, short storage time, easy aging and the like, and achieves easy large-scale production and simple preparation method. , the effect of low cost

Inactive Publication Date: 2016-06-22
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

[0003] Although epoxidized natural rubber overcomes the problem of storage hardening of natural rubber, it has a fatal shortcoming of poor aging resistance, because the molecular chain of epoxidized natural rubber contains a large number of unsaturated double bonds and epoxy groups , very prone to chemical reactions, epoxidized natural rubber is affected by external factors such as heat, oxygen, light, mechanical force, radiation, chemical media, ozone in the air, etc. during use, causing chemical changes in its macromolecular chains and destroying them. The original chemical structure of the rubber is destroyed, which leads to the deterioration of the rubber properties and leads to the aging of epoxidized natural rubber products during processing or use, and its aging performance is worse than that of natural rubber.
Therefore, epoxidized natural rubber products generally have problems such as short storage time, short service life, aging and stickiness, which limit the application of epoxidized natural rubber to a large extent.
[0004] At present, in the prior art, the method of adding rare earth stearate to the compounding system of epoxidized natural rubber is often used to improve the aging performance of epoxidized natural rubber, but after adding rare earth stearate, the effect on epoxidized natural rubber Poor protection against ozone aging

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  • Anti-aging epoxidized natural rubber and preparation method thereof

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preparation example Construction

[0032] The present invention provides the preparation method of anti-ageing epoxidized natural rubber described in above-mentioned technical scheme, comprises the following steps:

[0033] (1) under ultrasonic stirring condition, stearate is reacted with surfactant in aqueous phase system, obtains modified stearate dispersion;

[0034] (2) the modified stearate dispersion is mixed with the milky epoxidized natural rubber, and the ultrasonic stirring is continued to obtain the epoxidized natural rubber of the latex state;

[0035] (3) mixing the epoxidized natural rubber in the latex state with a coagulant to obtain the epoxidized natural rubber dry glue;

[0036] (4) Mixing the epoxidized natural rubber dry rubber with rare earth carboxylates and vulcanization processing aids to obtain aging-resistant epoxidized natural rubber.

[0037] In the present invention, under the condition of ultrasonic stirring, the stearate and the surfactant are reacted in the water phase system t...

Embodiment 1

[0044]Add 0.2 parts of calcium stearate to 100 parts of deionized water, control the ultrasonic power to 500W, and add 0.05 parts of sodium dodecylbenzenesulfonate in the state of ultrasonic dispersion, and place it in a water bath at 60°C for continuous Ultrasonic stirring for 4 hours to obtain a modified stearate dispersion, followed by adding 100 parts of epoxidized natural rubber latex with an epoxidation degree of 2 in dry rubber, and continuing ultrasonic stirring for 0.5 hours to obtain epoxidized natural rubber latex in a latex state. Natural rubber; add 0.5 part of methanol to coagulate the epoxidized natural rubber in the milk state, after solidification, go through tableting, granulation, and dry to obtain the epoxidized natural rubber in the dry state, then add 0.2 part on the double-roller open mill Lanthanum oleate and 0.8 parts of sulfur, 2 parts of accelerator NS, 5 parts of zinc oxide and 1 part of stearic acid are mixed and vulcanized to obtain aging-resistant...

Embodiment 2

[0047] Add 1 part of magnesium stearate to 100 parts of deionized water, control the ultrasonic power to 700W, and add 0.08 parts of sodium lauryl sulfate in the state of ultrasonic dispersion, and place it in a water bath at 70°C for 5 hours and continuously stir , to obtain a modified stearate dispersion, then add 100 parts of epoxidized natural rubber latex with a degree of epoxidation of 10 dry rubber, continue ultrasonic stirring for 0.6h, then add 2 parts of ethanol to make the milk state Epoxidized natural rubber is solidified to obtain the epoxidized natural rubber of dry rubber state, then on the two-roll mill, add 0.5 part of cerium stearate and 1 part of sulfur, 1.8 parts of accelerator NS, 4 parts of zinc oxide and 1 part of 100% stearic acid is mixed and vulcanized to obtain anti-aging epoxidized natural rubber.

[0048] According to the methods described in GB / T3512-2001, GB / T7762-2003 and GB / T16585-1996, the air aging resistance, ozone aging resistance and ultra...

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Abstract

The invention discloses anti-aging epoxidized natural rubber and a preparation method thereof.The method comprises the steps that stearate is added to deionized water, surfactant is added in the state of ultrasonic dispersion, the mixture is put into a water bath, continuous ultrasonic stirring is conducted, modified stearate dispersions are obtained, then epoxidized natural latexes are added, ultrasonic stirring is conducted continuously, and epoxidized natural rubber in a latex state is obtained; rare earth carboxylate is added onto a double-roller open mixing machine to be subjected to mixing with a vulcanization processing agent, and the anti-aging epoxidized natural rubber is obtained.The prepared anti-aging epoxidized natural rubber is excellent in performance, the processing property and the physical mechanical property of sizing materials are not affected, and meanwhile the anti-aging property is significantly improved; the anti-aging epoxidized natural rubber can be used for epoxidized natural rubber products such as high-performance green tires, rubber tubes, medical latex products and shoe soles.

Description

technical field [0001] The invention relates to the technical field of epoxidized natural rubber, in particular to an aging-resistant epoxidized natural rubber and a preparation method thereof. Background technique [0002] Epoxidized natural rubber is obtained by epoxidizing natural rubber by adding hydrogen peroxide under acidic conditions. Epoxidized natural rubber has excellent air tightness, oil resistance and good adhesion, as well as good wet skid resistance and low rolling resistance, and has broad application prospects in the application of high-performance green tires. [0003] Although epoxidized natural rubber overcomes the problem of storage hardening of natural rubber, it has a fatal shortcoming of poor aging resistance, because the molecular chain of epoxidized natural rubber contains a large number of unsaturated double bonds and epoxy groups , very prone to chemical reactions, epoxidized natural rubber is affected by external factors such as heat, oxygen, l...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L15/00C08K13/02C08K3/06C08K5/47C08K3/22C08K5/09C08K5/098
CPCC08K3/06C08K3/22C08K5/09C08K5/098C08K5/47C08K13/02C08K2003/2296C08K2201/014C08L2201/08C08L15/00
Inventor 杨昌金罗勇悦彭政许逵钟杰平黄红海林宏图
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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