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Method for preparing epoxidized liquid natural rubber

A technology of natural rubber and natural rubber latex, which is applied in the field of preparation of epoxidized liquid natural rubber, can solve the problems that phenylhydrazine is highly toxic, has great environmental hazards, and cannot be applied to industrial production, and achieves short reaction time, low reaction temperature, low cost effect

Active Publication Date: 2012-01-11
HAINAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the United States and Malaysia, the technology of producing liquid natural rubber at the latex stage using the phenylhydrazine / air redox system has been industrialized. However, phenylhydrazine is highly toxic and cannot be used in industrial production in my country, which is more harmful to the environment.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Step 1: Preparation of epoxidized natural rubber latex

[0017] Epoxidized natural rubber latex was prepared by known methods. That is to dilute the centrifugally concentrated natural rubber latex to 20% of the dry rubber content, add a non-ionic surfactant, commonly used Ethomeen 18 / 60, so that the dosage is 3% of the weight of the dry rubber, and then add a concentration of 35% peracetic acid or The peroxyformic acid solution was slowly added to the stabilized diluted latex, and the reaction conditions were controlled at 60°C for 24 hours to obtain epoxidized natural rubber latex.

[0018] Step 2: Preparation of Epoxidized Liquid Natural Rubber

[0019] Add 0.5 parts by mass of periodic acid to the epoxidized natural rubber latex with a dry rubber content of 20%, and the ratio of periodic acid to the epoxidized unit is 0.51mol.mo -1 , reacted at 30°C for 2h, then precipitated in methanol, and dried in vacuum at room temperature to obtain a bright yellow epoxidized l...

Embodiment 2

[0021] Step 1: Preparation of epoxidized natural rubber latex

[0022] Epoxidized natural rubber latex was prepared by known methods. That is to dilute the centrifugally concentrated natural rubber latex to 20% of the dry rubber content, add a non-ionic surfactant, commonly used Ethomeen 18 / 60, so that the dosage is 3% of the weight of the dry rubber, and then add a concentration of 35% peracetic acid or The peroxyformic acid solution was slowly added to the stabilized diluted latex, and the reaction conditions were controlled at 60°C for 24 hours to obtain epoxidized natural rubber latex.

[0023] Step 2: Preparation of Epoxidized Liquid Natural Rubber

[0024] Add 0.5 parts by mass of periodic acid to the epoxidized natural rubber latex with a dry rubber content of 35%, and the ratio of periodic acid to the epoxidized unit is 1.13mol.mol -1 , reacted at 30°C for 12h, then precipitated in methanol, and dried in vacuum at room temperature to obtain a bright yellow epoxidized...

Embodiment 3

[0026] Step 1: Preparation of epoxidized natural rubber latex

[0027] Epoxidized natural rubber latex was prepared by known methods. That is to dilute the centrifugally concentrated natural rubber latex to 20% of the dry rubber content, add a non-ionic surfactant, commonly used Ethomeen 18 / 60, so that the dosage is 3% of the weight of the dry rubber, and then add a concentration of 35% peracetic acid or The peroxyformic acid solution was slowly added to the stabilized diluted latex, and the reaction conditions were controlled at 60°C for 24 hours to obtain epoxidized natural rubber latex.

[0028] Step 2: Preparation of Epoxidized Liquid Natural Rubber

[0029] Add 0.5 parts by mass of periodic acid to the epoxidized natural rubber latex with a dry rubber content of 50%, and the ratio of periodic acid to the epoxidized unit is 0.24mol.mol -1 , reacted at 30°C for 21h, then precipitated in methanol, and dried in vacuum at room temperature to obtain a bright yellow epoxidized...

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Abstract

The invention discloses a method for preparing epoxidized liquid natural rubber, which is characterized by adding a strong oxidizer (periodic acid) to epoxidized natural rubber at 30 DEG C to prepare the epoxidized liquid natural rubber by chemical degradation. The prepared epoxidized liquid natural rubber is a brilliant yellow liquid which is sticky and has liquidity. The new method for preparing the epoxidized liquid natural rubber has the advantages of simple technical process, less energy consumption, less pollution, short reaction time, low reaction temperature, obvious degradation effect, wide application and high economic benefit.

Description

technical field [0001] The present invention is a method for preparing epoxidized liquid natural rubber. specifically involves the use of a strong oxidizing agent, periodate H 5 IO 6 A preparation method for preparing epoxidized liquid natural rubber by chemically degrading epoxidized natural rubber. Background technique [0002] Liquid natural rubber is another new variety of natural rubber in the latest development stage, which can be used in technical fields such as processing aids, reactive plasticizers, and adhesives. So far, there are three methods for preparing liquid natural rubber, these methods are: redox method, photocatalytic method, high temperature and high pressure oxidation method. Traditional production adopts the method of adding a peptizer to a high-temperature open mixer to produce liquid natural rubber with a number-average molecular weight of 39,000. However, this method requires high-temperature degradation, consumes a lot of energy, and has a high ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/08
Inventor 廖双泉廖小雪廖建和佘晓东陈永平胡志海
Owner HAINAN UNIV