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Method for preparing liquid natural rubber

A natural rubber and liquid technology, which is applied in the field of preparing liquid natural rubber, can solve the problems of high environmental hazards, phenylhydrazine is highly toxic, and cannot be applied to industrial production, and achieves the effects of low energy consumption, low cost, and low toxicity

Active Publication Date: 2011-01-12
HAINAN UNIVERSITY
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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

[0018] Step 1: Preparation of purified latex

[0019] Make a solution of 8% sodium lauryl sulfate in terms of dry rubber content, add it to the concentrated latex with a concentration of 60%, and dilute the latex to 20% with distilled water, let it stand for 15 hours, and then concentrate it to 60% by centrifugation. %, so repeated three times to obtain purified latex.

[0020] Step 2: Preparation of liquid natural rubber

[0021] Adding 1 mass part of potassium persulfate and 15 mass parts of propionaldehyde in the dry rubber mass fraction of 100 mass parts in dry rubber content is 30% of the purified latex, and the reaction is carried out in a shaking device in a water bath at 80 ° C. The shaking range is 2cm, the shaking speed is 115r / min, and the reaction is 24h. The number average molecular weight of the obtained liquid natural rubber is 19000. The product is a viscous yellow liquid with fluidity. Then it is coagulated with acetone, and the clot is soaked in water for 24...

Embodiment 2

[0023] Step 1: Preparation of purified latex

[0024] The preparation of purified latex is with example 1.

[0025] Step 2: Preparation of liquid natural rubber

[0026] Adding 1 mass part of potassium persulfate and 30 mass parts of propionaldehyde in the dry rubber mass fraction of 100 mass parts in dry rubber content is 45% of the purified latex, and the reaction is carried out in a shaking device in a water bath at 70 ° C. The shaking range is 2cm, the shaking speed is 115r / min, and the reaction is 20h. The number average molecular weight of the obtained liquid natural rubber is 11000. The product is a viscous yellow liquid with fluidity. Then it is coagulated with acetone, and the clot is soaked in water for 24h and cleaned. , dried in vacuo at room temperature.

Embodiment 3

[0028] Step 1: Preparation of purified latex

[0029] The preparation of purified latex is with example 1.

[0030] Step 2: Preparation of liquid natural rubber

[0031] Add 1 mass part of potassium persulfate and 20 mass parts of propionaldehyde to 60% of the purified latex in 100 mass parts of dry rubber content, the reaction is carried out in a shaking device in a water bath at 50 ° C, and the shaking range is 2cm, the shaking speed is 115r / min, and the reaction is 26h. The number average molecular weight of the obtained liquid natural rubber is 16000. The product is a viscous yellow liquid with fluidity. Then it is coagulated with acetone, and the clot is soaked in water for 24h and cleaned. , dried in vacuo at room temperature.

[0032] It can be seen that by adding different mass parts of reagents, liquid natural rubbers with different molecular weights can be prepared under different reaction time and temperature conditions, and the appropriate proportion can be adjus...

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Abstract

The invention relates to a method for preparing liquid natural rubber. The liquid natural rubber is another new variety of natural rubber at the latest development stage. 1 mass part of radical initiator and 15 to 30 mass parts of carbonyl compound are added into purified latex at the temperature of between 50 and 80 DEG C, the mixture is reacted for 20 to 26 hours to form the liquid natural rubber of different relative molecular weights, and the product is viscous yellow liquid with liquidity. The method for preparing the liquid natural rubber has the advantages of simple process, low energy consumption, low cost, low pollution, stable product performance, wide application range and high economic benefit.

Description

technical field [0001] The present invention relates to the method for preparing liquid natural rubber, and liquid natural rubber is another new variety of natural rubber in the latest development stage. Background technique [0002] So far, there are 3 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 peptizer to the 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, which consumes a lot of energy and costs a lot. In addition, the liquid natural rubber prepared by the photocatalysis method is not very good, the structure is quite complicated, and the reaction time is long, so the degradation rate of NR cannot be well controlled. , not suitable for industrial production. At present, the redox method is...

Claims

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Application Information

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IPC IPC(8): C08C1/04C08C19/00
Inventor 廖双泉廖小雪廖建和佘晓东陈永平胡志海
Owner HAINAN UNIVERSITY
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