Preparation of chlorinated polyvinyl chloride resin for pipe fittings

A technology of chlorinated polyvinyl chloride and polyvinyl chloride resin, which is applied in the field of aqueous phase suspension chlorination method, can solve the problems of resin fluidity deterioration, increase, and influence, and achieve good processing fluidity and heat resistance stability Effect

Inactive Publication Date: 2009-07-22
SHANGHAI CHLOR ALKALI CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The chlorine content has a great influence on the performance of CPVC resin for pipe fittings. If the chlorine content is high, the Vicat softening temperature and thermal deformation temperature of the resin will be high, but at the same time, the partial chlorine structure (—CH 2 CCl 2 -) will also increase accordingly, which will adversely affect the heat-resistant stability of the resin, and at the same time the fluidity of the resin will also deteriorate; the chlorine content is low, and the partial chlorine structure in the molecular chain is relatively small, and the resin's Good heat resistance stability and fluidity, but at the same time the Vicat softening temperature, heat distortion temperature and other indicators of the resin will decrease accordingly

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] In a 100L enamel reaction kettle, add 10kg of PVC resin with a polymerization degree of 500 and 90kg of hydrochloric acid with a weight concentration of 20%, and use different types of initiators under the same operating conditions except for different initiator conditions. Initiator consumption is 0.1% (wt %) of PVC consumption, i.e. 10g lauroyl peroxide, 10g benzoyl peroxide, 33.3g weight concentration are 30% hydrogen peroxide, 10g tert-butyl peroxycarbonate, 10g weight Concentration is the composite initiator of 30% hydrogen peroxide and 7g lauroyl peroxide, after adding 166.7g30% silica sol solution, feed nitrogen for 30 minutes, while the jacket feeds steam to raise the temperature to 75°C, turn off nitrogen, and pass through After 5 minutes of chlorine gas with a flow rate of 15L / min, close the tail gas valve, and at the same time raise the temperature to 95°C, adjust the chlorine flow rate to 6L / min for 40 minutes; raise the temperature to 105°C, adjust the chlor...

Embodiment 2

[0031] In a 100L enamel reaction kettle, add 25kg of PVC resin with a degree of polymerization of 800 and 75kg of hydrochloric acid with a weight concentration of 10%, and use different types of initiators under the same operating conditions except for different initiator conditions. Initiator consumption is 0.5% (wt%) of PVC consumption, i.e. 125g lauroyl peroxide, 125g benzoyl peroxide, 416.7g weight concentration are 30% hydrogen peroxide, 125g tert-butyl peroxycarbonate, 60g peroxide The composite initiator of benzoyl oxide and 65g lauroyl peroxide, after adding 2500g of polyvinyl alcohol 10% solution with a molar alcoholysis degree of 78%, feed nitrogen for 30 minutes, while the jacket feeds steam and heats up to 75 ℃, turn off the nitrogen, let in chlorine gas with a flow rate of 15L / min for 5 minutes, then close the tail gas valve, and at the same time raise the temperature to 95°C, and maintain the chlorine flow rate for 40 minutes; raise the temperature to 105°C, adjus...

Embodiment 3

[0035]In a 100L enamel reaction kettle, add 35kg of PVC resin with a polymerization degree of 1000 and 65kg of deionized water. Except for different initiator conditions, under the same operating conditions, add different types of initiators. The amount of initiators is 1.0% (wt %) of PVC consumption, i.e. 350g lauroyl peroxide, 350g benzoyl peroxide, 1166.7g weight concentration is 30% hydrogen peroxide, 350g tert-butyl peroxycarbonate, 500g weight concentration is 30% Hydrogen peroxide and 200g of benzoyl peroxide compound initiator, after adding 1750g of 30% silica sol solution, nitrogen gas was passed in for 30 minutes, while steam was passed into the jacket to raise the temperature to 75°C, nitrogen gas was turned off, and the flow rate was 15L / After 10 minutes of chlorine gas, close the tail gas valve, and at the same time raise the temperature to 95°C, adjust the chlorine gas flow rate to 20L / min for 40 minutes; raise the temperature to 105°C, adjust the chlorine flow r...

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PUM

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Abstract

The invention discloses a method for preparing chlorinated polynvinyl chloride resin for pipe fittings, comprising the following steps of: suspending polyvinyl chloride resin in water or hydrochloric acid solution, and adding initiator and dispersant; leading in chlorine at the temperature of 40-90 DEG C, on the basis of 10-35 kg of PVC and at the chlorine-leading speed of 10-30 L / min, closing an off gas valve after chlorine-leading lasts for 5-10 min, and raising the temperature till 90-100 DEG C, and then leading in the chlorine at the speed of 4-30 L / min for 30-50 min; and raising the temperature till 100-110 DEG C, then leading in the chlorine at the speed of 8-60 L / min for 60-140 min, then raising the temperature till 110-125 DEG C, leading in the chlorine at the speed of 4-30 L / min for 30-60 min, then stopping the chlorine leading-in, and continuing the reaction for 30-60 min so as to obtain the product. The CPVC resin prepared by the method has good heat resistance stability and good processing fluidity and is applicable to the fabrication of the pipe fittings by means of injection molding.

Description

technical field [0001] The invention relates to a method for preparing chlorinated polyvinyl chloride resin for pipe fittings, in particular to a water-phase suspension chlorination method by adding a chemical initiator. Background technique [0002] Chlorinated polyvinyl chloride resin (CPVC) is an important polymer material, which is the product of further chlorination of polyvinyl chloride (PVC). CPVC plastic has excellent physical and chemical properties such as heat resistance, weather resistance, chemical medium corrosion resistance, bacterial pollution resistance, flame retardancy, smoke resistance, colorless and odorless, and is a novel plastic material with rapid development in the application field in recent years. [0003] The methods for preparing chlorinated polyvinyl chloride mainly include solvent method, solid phase method, liquid chlorine method and aqueous phase suspension method. [0004] Among them, the aqueous phase suspension method is the method with ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F8/22C08F114/06
Inventor 张建陈斌武岳群袁茂全蔡华明
Owner SHANGHAI CHLOR ALKALI CHEM
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