Process for water-phase suspension ultraviolet preparing chlorinated polyvinyl chloride

A chlorinated polyvinyl chloride and water-phase suspension technology, which is applied in the field of ultraviolet light preparation of chlorinated polyvinyl chloride in water-phase suspension, can solve the problems of environmental pollution, high production cost, narrow application range, etc., and achieves stable process control, Low production cost and versatile effects

Inactive Publication Date: 2003-03-12
刘旭思
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  • Summary
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  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage of the solvent method is that the products produced by the solvent method have poor heat resistance, high production cost, and environmental pollution; although the products produced by the aqueous phase suspension method have good heat resistance and low cost, but due to the addition of chemical initiators in the production process Initiation reaction is carried out, causing the product to decompose after long-term storage, unstable performance, narrow application range, and cannot be used as a raw material for making drinking water pipes

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] Install a UV lamp with a power of 1000W in a reactor with a volume of 5000L, fill the reactor with 800Kg of polyvinyl chloride resin, 3500Kg of water, and 6.5-7.5Kg of dispersant polysodium methacrylate, and control the reaction temperature at 80-85 ℃, the reaction pressure is 0.25-0.4Mpa, feed 480kg of chlorine gas into the reactor, turn on the ultraviolet light, react under the irradiation of ultraviolet light for 6 hours, turn off the ultraviolet light, the reaction is terminated, and then wash with water, neutralize and centrifuge And drying process, the obtained chlorine content is the extruded pipe type (J-700) chlorinated polyvinyl chloride of 66%.

example 2

[0015] Install a UV lamp with a power of 1000W in a reactor with a volume of 5000L, fill the reactor with 800Kg of polyvinyl chloride resin, 3500Kg of water, and 6.5-7.5Kg of dispersant polysodium methacrylate, and control the reaction temperature at 78-82 ℃, the reaction pressure is 0.2-0.4Mpa, feed 320Kg of chlorine gas into the reactor, turn on the ultraviolet light, react under the irradiation of ultraviolet light for 6 hours, turn off the ultraviolet light, the reaction is terminated, and then wash with water, neutralize and centrifuge And drying process, the obtained chlorine content is 63% injection pipe type (Z-500) chlorinated polyvinyl chloride.

example 3

[0017] Install a UV lamp with a power of 1000W in a reactor with a volume of 5000L, fill the reactor with 800Kg of polyvinyl chloride resin, 3500Kg of water, and 6.5-7.5Kg of dispersant polysodium methacrylate, and control the reaction temperature at 93-97 ℃, the reaction pressure is 0.2-0.4Mpa, feed 450Kg of chlorine gas into the reactor, turn on the ultraviolet light, react under the irradiation of ultraviolet light for 5.5 hours, turn off the ultraviolet light, the reaction is terminated, and then wash with water, neutralize and centrifuge And drying process, the obtained chlorine content is 65% adhesive type (N-500) chlorinated polyvinyl chloride.

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Abstract

A process for preparing chlorinated polyvinyl chloride by water-phase suspension method and ultraviolet radiation includes adding polyvinyl chloride resin and disperser to water, introducing C1 gas, copolymerizing reaction at 70-100 deg.C and 0.2-0.4 MPa under ultraviolet radiation for 4-6 hr, washing with water, neutralizing, centrifugal separation and drying. Its advantages are stable process, low cost, and high stability of products.

Description

technical field [0001] The invention relates to a method for preparing chlorinated polyvinyl chloride, more specifically a method for preparing chlorinated polyvinyl chloride with aqueous phase suspension ultraviolet light. Background technique [0002] Chlorinated polyvinyl chloride is a new type of polymer synthetic material. Its performance mainly depends on the content of chlorine and the distribution of chlorine on the molecular chain of chlorinated polyvinyl chloride. The key to the distribution of ethylene molecular chains, chlorinated polyvinyl chloride with the same chlorine content, due to the difference in chlorination conditions, the molecular structure is different, and its performance is also different. At present, the production methods for preparing chlorinated polyvinyl chloride mainly include solvent method, aqueous phase suspension method, and gas-solid phase method. The disadvantage of the solvent method is that the products produced by the solvent metho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F10/02
Inventor 刘旭思
Owner 刘旭思
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