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Low acid value solvent process of preparing chlorinated rubber

A technology of chlorinated natural rubber and natural rubber, which is applied in the field of preparation of chlorinated natural rubber by solvent method, and can solve the problems of accelerating the thermal decomposition speed of chlorinated natural rubber, corroding steel, poor thermal stability, etc.

Inactive Publication Date: 2008-12-17
FUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But, in this production process, the HCl in the carbon tetrachloride solution and the unreacted Cl 2 It is difficult to completely blow out with air; and the residual HCl and Cl 2 Adsorbed in the micropores of chlorinated natural rubber, it is also difficult to remove in the subsequent drying process
Therefore, the acid value of chlorinated natural rubber products is higher, the corrosion is strong, and the thermal stability is poor.
[0006] HCl and Cl contained in chlorinated natural rubber 2 It has seriously affected the quality of chlorinated natural rubber and restricted its application in high-end products; and it is used to contain HCl and Cl 2 The paint produced by chlorinated natural rubber will seriously corrode steel and cause rust spots on steel
At the same time, HCl has a self-catalytic effect on the degradation of chlorinated natural rubber, which accelerates the thermal decomposition rate of chlorinated natural rubber, reduces the chlorine content of chlorinated natural rubber, and leads to the deterioration of the performance of chlorinated natural rubber.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Measure 500ml of the chlorinated natural rubber organic solution after the chlorination reaction is finished in a 1000ml three-necked flask, add 5g of calcium stearate, turn on the mixer to completely dissolve the calcium stearate; slowly add 6ml of 1.5mol / L sodium carbonate dropwise to three-necked flask (about 1ml / min), and then place the three-necked flask in a constant temperature water bath at 60°C for 40 minutes to react. After the reaction, the chlorinated natural rubber solution was dried for 6 hours in a vacuum drying oven with a temperature of 60° C. and a vacuum degree of 0.075 MPa to make a powder product.

Embodiment 2

[0021] Measure 500ml of the chlorinated natural rubber organic solution after the chlorination reaction in a 1000ml three-necked flask, add 5g of calcium stearate, turn on the mixer to completely dissolve the calcium stearate; slowly add 6ml of 1.5mol / L sodium bicarbonate dropwise into a three-necked flask (about 1ml / min), and then place the three-necked flask in a constant temperature water bath at 70°C to react for 40 minutes. After the reaction, the chlorinated natural rubber solution was dried for 6 hours in a vacuum drying oven with a temperature of 60° C. and a vacuum degree of 0.075 MPa to make a powder product.

Embodiment 3

[0023] Measure 500ml of the chlorinated natural rubber organic solution after the chlorination reaction in a 1000ml three-necked flask, add 5g of calcium stearate, turn on the mixer to completely dissolve the calcium stearate; slowly drop 3ml of 2.0mol / L sodium thiosulfate Add it into a three-necked flask (about 1ml / min), and then place the three-necked flask in a constant temperature water bath at 50°C for 60 minutes to react. After the reaction, the chlorinated natural rubber solution was dried for 6 hours in a vacuum drying oven with a temperature of 60° C. and a vacuum degree of 0.075 MPa to make a powder product.

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Abstract

The low acid value solvent process of preparing chlorinated rubber includes the following steps: plasticating natural rubber; chemically degrading; chlorinating reaction; and dechlorinating. It has the dechlorinating step. After finishing chlorinating reaction, water solution of stearate and water solution of weak alkaline salt are added into the reactor and mixed homogeneously, and the organic chlorinated natural rubber solution is finally dried to form the product. The said preparation process can eliminate HCl and Cl2 dissolved in organic solvent completely top high quality low acid value chlorinated rubber.

Description

technical field [0001] The present invention relates to the improvement of the preparation method of chlorinated natural rubber by solvent method. Background technique [0002] Chlorinated natural rubber (CNR) is a derivative with a chlorine content of more than 60% obtained from natural rubber modified by chlorination, soluble in aromatic hydrocarbons, esters, ketones, ethers , animal and vegetable oils and other solvents, but insoluble in aliphatic hydrocarbons, alcohols and water. It is widely used in coatings, inks, adhesives and other industries due to its excellent properties such as film formation, adhesion, weather resistance, wear resistance, quick drying, corrosion resistance, water penetration resistance, flame retardancy and insulation. In recent years, the application field of chlorinated natural rubber has been expanding continuously, and its demand is also increasing. [0003] The traditional solvent-based chlorinated natural rubber production process is as ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08C19/12
Inventor 施小芳郑智扬林青林述英
Owner FUZHOU UNIV