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Technique for preparing epoxy natural rubber

A technology for natural rubber and epoxidation, applied in the field of preparing epoxidized natural rubber, can solve the problems of large dosage and rising reaction temperature, and achieve the effect of inhibiting ring opening and ensuring product quality and quality consistency

Inactive Publication Date: 2010-02-24
AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Moreover, the preparation reaction conditions have a great influence on the ring-opening reaction of epoxy groups in the preparation reaction stage of epoxidized natural rubber, because the preparation reaction of epoxidized natural rubber is a typical exothermic reaction, and the existing preparation method The amount of formic acid in the medium is very large, and the reaction rate is relatively fast. In addition, the natural latex is a viscous fluid, so that the heat released during the reaction cannot be diffused outward through heat exchange in time, and the heat will continue to accumulate, which will inevitably lead to an increase in the reaction temperature of the preparation. , to promote the ring-opening of the epoxy group

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Weigh 113 parts of concentrated natural rubber latex with a total solid mass content of 60%, and add 0.3 part of polyoxyethylene sorbitol ether to keep the latex stable. Then, 10 parts of formic acid with a mass concentration of 86%, 90 parts of hydrogen peroxide with a mass concentration of 30%, 5 parts of fatty acid enzyme Novozym 435, and 180 parts of deionized water were sequentially added under stirring. The reaction was carried out at 40° C. for 24 hours. After the reaction is over, adjust the pH value of the latex to 7 with ammonia water, and heat the latex until the latex is solidified, dehydrated, rinsed, granulated, and dried to make a particle size of 5 to 12 mm and a degree of epoxidation of 48%. Epoxidized natural rubber with a mass content of 3%.

Embodiment 2

[0022] Weighing 113 parts of concentrated natural latex with a total solid mass content of 60%, added 0.3 part of polyoxyethylene sorbitol ether to keep the latex stable. Then, 8 parts of formic acid with a mass concentration of 86%, 70 parts of hydrogen peroxide with a mass concentration of 30%, 4 parts of fatty acid enzyme Novozym 435, and 160 parts of deionized water were sequentially added under stirring. The reaction was carried out at 35°C for 20 hours. After the reaction, the pH value of the latex is adjusted to 7 with ammonia water, and steam is heated until the latex is solidified, dehydrated, rinsed, granulated, and dried. Epoxidized natural rubber with a mass content of cyclic substances of 2.8%.

Embodiment 3

[0024]Weigh 113 parts of concentrated natural rubber latex with a total solid mass content of 60%, add 0.2 part of polyoxyethylene sorbitol ether to keep the latex stable. Then, 6 parts of formic acid with a mass concentration of 86%, 60 parts of hydrogen peroxide with a mass concentration of 30%, 3 parts of fatty acid enzyme Novozym 435, and 160 parts of deionized water were sequentially added under stirring. The reaction was carried out at 35°C for 12 hours. After the reaction, use ammonia water to adjust the pH value of the latex to 7, feed steam and heat until the latex is solidified, dehydrated, rinsed, granulated, and dried to make a particle size of 5-12 mm and an epoxidation degree of 8%. Epoxidized natural rubber with a mass content of 1.0%.

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Abstract

The invention discloses a technique for preparing epoxy natural rubber, related to a technique for preparing the epoxy natural rubber through epoxidation reaction. The technique comprises the following steps: stabilizing concentrated natural rubber by using a stabilizing agent; then, keeping stirring and sequentially adding methanoic acid, peroxide, lipase Novozym 435 and deionized wate; uniformlystirring and reacting for 12-24 hours under the temperature of 25 DEG C-50 DEG C; after the reaction is completed, using ammonia water to regulate the pH value of rubber latex to be 7; leading in steam to heat the rubber latex until the rubber latex is solidified, and then dehydrating, rinsing, granulating and drying the rubber latex. The invention effectively reduces the temperature of preparation reaction so that the preparation reaction of the epoxy natural rubber is carried out under a more moderate condition and the content of ring-opening products is controlled to be lower than 3 percent.

Description

【Technical field】 [0001] The invention relates to the technology of preparing epoxidized natural rubber through epoxidation reaction. 【Background technique】 [0002] Epoxidized natural rubber is a chemically modified natural rubber prepared by epoxidizing natural rubber. With the conversion of non-polar carbon-carbon double bonds into polar epoxy groups, the wet skid resistance, oil resistance, gas permeation resistance, adhesion and other properties of epoxidized natural rubber are significantly improved, and can replace Butadiene rubber, nitrile rubber, butyl rubber and other synthetic materials are used in the production of automobile tires, oil-resistant sealing products, pharmaceutical bottle stoppers, cord dipping, and paper bonding. Especially in the automotive tire industry, epoxidized natural rubber is the only polymer material that can improve the tire's wet skid resistance and reduce rolling resistance, and is an essential engineering material for the production ...

Claims

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Application Information

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IPC IPC(8): C08C19/06
Inventor 余和平曾宗强黄茂芳
Owner AGRI PRODS PROCESSING RES INST CHINESE ACAD OF TROPICAL AGRI SCI
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