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Method for producing chlorinated polyvinyl chloride with high chlorinity by one-step method

A chlorinated polyvinyl chloride, chlorine content technology, applied in the field of one-step production of high chlorine content chlorinated polyvinyl chloride resin, can solve the problems of low reaction pressure, high reaction pressure, complicated process, etc., and achieve fast reaction speed , Excellent processing performance, high chlorine content effect

Inactive Publication Date: 2009-10-07
WUHU RONGHUI CHEM IND
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the low reaction pressure of this method, it is difficult to obtain CPVC resin with higher chlorine content
[0005] U.S. Patent No. 6,187,868 uses a two-step process to synthesize CPVC resin with a chlorine content greater than 70%, which effectively improves the thermal deformation resistance of CPVC, but the reaction pressure of this process is relatively high (up to 1.0 MPa), and it needs to be processed in the second step of the reaction. phase add H 2 o 2 , the process is complex and difficult to implement

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] In a 200L reactor, add 150kg of deionized water, 90g of sodium dodecylbenzenesulfonate, 300g of hydroxypropyl cellulose, 150g of BPO / DCP composite initiator with a mass ratio of 2:1, and the average degree of polymerization is 1000 30 kg of PVC resin with an oil absorption rate of 20.3% and a bulk density of 0.46 g / mL. Under stirring, fully emulsify for 20 minutes, then close the reaction kettle, and then inject N 2 Replace the air in the kettle for 5 minutes. When steam is introduced into the jacket to raise the temperature of the material to 60°C, stop heating and start to feed chlorine gas into the kettle to make the pressure in the kettle reach 0.5 MPa, and continue the reaction while maintaining this pressure, and the temperature of the material during the reaction continues to rise due to the heat of reaction. High, when the chlorine passing time is 5.5h, the chlorine passing amount is 29.4kg, and the material temperature is 116°C. At this time, the introduction...

Embodiment 2

[0018] In a 200L reactor, add 150kg of deionized water, 300g of nonylphenol polyoxyethylene ether, 1000g of hydroxyethyl cellulose, 150g of BPO / DCP composite initiator with a mass ratio of 2:1, and the average degree of polymerization is 1000, 30 kg of PVC resin with an oil absorption rate of 20.3% and a bulk density of 0.46 g / mL. Under stirring, fully emulsify for 20 minutes, then close the reaction kettle, and then inject N 2 Replace the air in the kettle for 5 minutes. When steam is introduced into the jacket to raise the temperature of the material to 60°C, stop heating and start to introduce chlorine gas into the kettle to make the pressure in the kettle reach 0.6MPa, and continue the reaction at this pressure, and the temperature of the material during the reaction continues to rise due to the heat of reaction. High, when the chlorine passing time is 5.6h, the chlorine passing amount is 31.6kg, and the material temperature is 118°C. At this time, the introduction of ch...

Embodiment 3

[0020] In a 200L reactor, add 150kg of industrial hydrochloric acid with a mass concentration of 20%, 900g of ethylene oxide-propylene oxide copolymer, 1500g of silica powder, and 300g of BPO / DCP composite initiator with a mass ratio of 2:1, and the average polymerization 30kg of PVC resin with a degree of 1000, an oil absorption rate of 20.3%, and a bulk density of 0.46g / mL. Under stirring, fully emulsify for 20 minutes, then close the reaction kettle, and then inject N 2 Replace the air in the kettle for 5 minutes. When steam is introduced into the jacket to raise the temperature of the material to 60°C, stop heating and start to introduce chlorine gas into the kettle to make the pressure in the kettle reach 0.6MPa, and continue the reaction at this pressure, and the temperature of the material during the reaction continues to rise due to the heat of reaction. High, when the chlorine passing time is 5.5h, the chlorine passing amount is 35.7kg, and the material temperature i...

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Abstract

The present invention discloses a method for producing chlorinated polyvinyl chloride with a high chlorinity by a one-step method, namely, in a CPVC synthetic process of an aqueous phase method, an industry alcaine with 20% of water or mass concentration is used as a reaction medium, by means of improving the reaction pressure suitably and adding the dissolvability of chlorine gas in water, the reaction speed and the product chloridization uniformity degree are all improved, thereby a CPVC resin with good processability and high chlorinity will be synthesizing by one step.

Description

technical field [0001] The invention relates to a method for producing chlorinated polyvinyl chloride resin with high chlorine content in one step. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) is a PVC modified material obtained after chlorination modification of polyvinyl chloride (PVC). Compared with PVC, CPVC has a higher chlorine content (63% to 74%). Due to the presence of a large number of chlorine atoms in its molecular chain, the polarity and rigidity of its molecular chain increase, making it have higher thermal deformation. Temperature and unique chemical resistance, so CPVC is widely used as a high-quality heat-resistant material and anti-corrosion plastic. It is widely used in the production of pipes, pipe fittings, and large-diameter cable buried sheath pipes for hot water transportation and corrosive fluid transportation. [0003] The purpose of developing CPVC resin is to use CPVC resin containing a large number of chlorine atoms, the ...

Claims

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Application Information

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IPC IPC(8): C08F114/06C08F8/22
Inventor 宋秋生班琳宋永海汪爱兵凌林张顺利万艺
Owner WUHU RONGHUI CHEM IND
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