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Synthesis Technology of Chlorinated Polyvinyl Chloride by Acid Phase Suspension Method

A technology for the synthesis of chlorinated polyvinyl chloride, which is applied in the field of synthesis of chlorinated polyethylene by the acid phase suspension method, can solve the problems of poor light and thermal stability, carbon-carbon bond breakage in the main chain, and large differences in technical levels. Achieve uniform distribution, reduce energy consumption, and achieve good quality

Active Publication Date: 2017-10-31
JIANGSU ZHONGXU POLYMER MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the overall technical level is quite different from that of foreign countries.
[0004] At present, there are mainly the following problems in the use of aqueous phase suspension method: the temperature needs to reach 100°C during the synthesis process, and PVC has poor stability to light and heat, and hydrogen chloride begins to decompose at 100°C, making it change color from white light yellow red black
The initiator and ultraviolet photoinitiation added in the chlorination reaction will cause photooxidative decomposition of PVC, break the carbon-carbon bond of the main chain, and cause poor product quality.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A kind of acid phase suspension method chlorinated polyvinyl chloride synthesis technique, comprises the following steps:

[0024] Put 10kg of PVC special material, 50 liters of 10~25% hydrochloric acid, 200g of dispersant A, 200g of dispersant B, and 15g of initiator into the reaction kettle, start stirring, slowly raise the temperature and emulsify to 80°C, and then carry out chlorine flow to drive the air in the kettle. After the temperature reaches 85°C, pass chlorine to control the temperature of the reactor to 85°C~90°C until the amount of chlorine required for the reaction (raw material: amount of chlorine = 1:0.3) and the reaction time (90 minutes) is reached, then the reaction is terminated, and the temperature is lowered to 80°C. Open the compressed air valve at ℃ to drive out the residual chlorine in the reaction kettle for 30 minutes, cool down to 40 ℃ and discharge the material to the deacidification tank to separate the material from the mother liquor of hy...

Embodiment 2

[0026] Put 15kg of PVC special material and 70 liters of 10~25% hydrochloric acid into the reaction kettle, 250g of dispersant A, 500g of dispersant B, and 30g of initiator, start stirring, slowly raise the temperature and emulsify to 80°C, and then carry out chlorine flow to catch the air in the kettle. After reaching 85°C, pass chlorine to control the temperature of the reactor to 85°C~90°C, until the amount of chlorine required for the reaction (raw material: chlorine amount = 1:0.52) and reaction time (180 minutes) is reached, then the reaction is terminated, and the temperature is lowered to 80°C Open the compressed air valve to drive out the residual chlorine in the reactor for 0.5 hours, cool down to 40°C and discharge the material until the material in the deacidification tank is separated from the mother liquor of hydrochloric acid, the mother liquor is recovered, the material is washed with process water until the pH value is 6, and then put into the reactor The pH of...

Embodiment 3

[0028] Put 20kg of PVC special material, 90 liters of 10~25% hydrochloric acid, 300g of dispersant A, 600g of dispersant B, and 50g of initiator into the reaction kettle, start stirring, slowly raise the temperature and emulsify to 80°C, and then carry out chlorine flow to drive the air in the kettle. After the temperature reaches 85°C, pass chlorine to control the temperature of the reactor to be 85°C~90°C until the amount of chlorine required for the reaction (raw material: amount of chlorine = 1:0.6) and the reaction time (250 minutes) is reached, then the reaction is terminated, and the temperature is lowered to 80°C. Open the compressed air valve at ℃ to drive out the residual chlorine in the reaction kettle for 0.5 hours, cool down to 40 ℃ and discharge until the material in the deacidification tank is separated from the mother liquor of hydrochloric acid, the mother liquor is recovered, the material is washed with process water until the pH value is 6, and then put into t...

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Abstract

The invention relates to a chlorinated polyvinyl chloride synthesized by virtue of an acid-phase suspension method. The chlorinated polyvinyl chloride is prepared from the raw materials comprising a special material for polyvinyl chloride, hydrochloric acid, a dispersant A, a dispersant B and an initiator, wherein the mass ratio of the special material for polyvinyl chloride to hydrochloric acid to the dispersant A to dispersant B to the initiator is equal to (10-20): (50-90): (0.2-0.3): (0.2-0.6): (0.015-0.05). According to the process, chlorination reaction is carried out by using the acid phase method as a reaction medium, mother liquor can be recycled, under the same circumstances, the chlorination reaction temperature in the acid phase method can be 10 DEG C lower than that of the aqueous phase method, the qualities of a product are same so that the energy consumption is effectively reduced and the economic efficiency is increased. At the same temperature, the distribution of chlorine atoms chlorinated by the acid phase method is more uniform than that chlorinated by the aqueous phase method, the quality of the product is better and the total amount of chlorine in the acid phase method is relatively less than that in the aqueous phase method.

Description

technical field [0001] The invention relates to the field of polymer synthetic materials, in particular to an acid phase suspension method chlorinated polyethylene synthesis process. Background technique [0002] Chlorinated polyvinyl chloride is made by chlorination modification of polyvinyl chloride (PVC) resin, and it is a new type of engineering plastic. It is a white powder, not easy to burn, resistant to concentrated acid, concentrated lye, mineral oil, etc. The product does not deform in boiling water, and is more soluble in organic solvents such as esters, ketones, and aromatic hydrocarbons than polyvinyl chloride. For the system of corrosion-resistant paint, adhesives and synthetic fibers. [0003] The synthesis process of chlorinated polyvinyl chloride mainly adopts the water phase suspension method. In the 1960s, the water phase suspension method CPVC industrialization device of Goodrich Company in the United States was put into production, and then Germany, Brit...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/22
Inventor 陈剑平朱晓芹陈凌峰徐晨曦王树东
Owner JIANGSU ZHONGXU POLYMER MATERIALS
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