Preparation method of CPVC resin by water-phase suspension method

A technology of CPVC resin and PVC resin, which is applied in the field of preparation of CPVC resin by aqueous phase suspension method, can solve the problems of weakening the absorption capacity of CPVC resin additives, poor plasticization uniformity of CPVC resin, and hindering resin uniformity, etc., to achieve dynamic thermal stability Long time, good initial colorability, and the effect of reducing structural defects

Active Publication Date: 2017-04-19
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

On the one hand, it hinders the deep chlorination of the resin and the uniformity of chlorination, causing defects in the structure of CPVC resin; on the other hand, it weakens the absorption capacity of CPVC resin additives, making CPVC resin poor in plasticization uniformity and difficult to process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] Add 80kg of deionized water and 10kg of chlorinated PVC resin QS-C60 with a degree of polymerization of 800 into a 100L chlorination reactor, start the stirring and ultrasonic device, the ultrasonic frequency is 25MHz, after the PVC resin is suspended in the water phase, turn off the ultrasonic device. Add 150g of peroxydicarbonate with a concentration of 40%. After using chlorine gas to discharge the air in the kettle, raise the temperature of the reactor, slowly introduce chlorine gas, and turn on the ultrasonic device at the same time. When the temperature of the reactor reaches about 85°C, the chlorination reaction accelerates. The temperature of the reactor is 100°C, the speed of chlorine flow is controlled at 50g / min, and the pressure of the reactor is kept at 0.3MPa. After chlorination reaction for 20 minutes, the ultrasonic device is turned off. When the amount of chlorine flow reaches 6.8kg, the flow of chlorine is stopped, and a terminator with a concentration o...

Embodiment 2

[0027] Add 80kg of deionized water and 15kg of chlorinated PVC resin QS-C65 with a degree of polymerization of 850 into a 150L chlorination reactor, start the stirring and ultrasonic device, the ultrasonic frequency is 25MHz, after the PVC resin is suspended in the water phase, turn off the ultrasonic device . Add 200g of peroxydicarbonate with a concentration of 40%. After using chlorine gas to discharge the air in the kettle, raise the temperature of the reactor, slowly introduce chlorine gas, and turn on the ultrasonic device at the same time. When the temperature of the reactor reaches about 85°C, the chlorination reaction accelerates. The temperature of the reaction kettle is 95°C, the speed of chlorine flow is controlled at 60g / min, and the pressure of the reaction kettle is maintained at 0.3MPa. After chlorination reaction for 15 minutes, the ultrasonic device is turned off. When the amount of chlorine flow reaches 10kg, the flow of chlorine is stopped, and the concentra...

Embodiment 3

[0029] Add 80kg of deionized water and 18kg of chlorinated PVC resin QS-C65 with a degree of polymerization of 900 into a 100L chlorination reactor, start the stirring and ultrasonic device, the ultrasonic frequency is 25MHz, after the PVC resin is suspended in the water phase, turn off the ultrasonic device . Add a total of 100g of peroxydicarbonate and dibenzoyl peroxide with a concentration of 40%. After using chlorine gas to discharge the air in the reactor, raise the temperature of the reactor, slowly introduce chlorine gas, and turn on the ultrasonic device at the same time. The temperature of the reactor reaches about 85°C When the chlorination reaction is accelerated, the temperature of the reactor is controlled at 105°C, the rate of chlorine flow is controlled at 7.2g / min, and the pressure of the reactor is maintained at 0.3MPa. After 20 minutes of chlorination, the ultrasonic device is turned off, and when the amount of chlorine flow reaches 12.5kg, stop Pass chlorin...

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Abstract

A preparation method of CPVC resin by a water-phase suspension method belongs to the field of a CPVC preparation technology. The preparation method is characterized in that ultrasonic wave at specific frequency is selected and has an effect of dispersing PVC resin. At this frequency of ultrasonic wave, it can be ensured that PVC resin is uniformly dispersed in an aqueous suspension system; and by utilization of energy effect and chemical effect of ultrasonic wave, deep chlorination and chlorination uniformity are guaranteed and structure defect of CPVC resin is reduced. The prepared CPVC resin has high chlorine content and ageing whiteness, good initial coloration, long dynamic thermal stable time, and good processing plasticizing performance.

Description

technical field [0001] The invention discloses a method for preparing CPVC resin by an aqueous phase suspension method, belonging to the technical field of CPVC preparation. Background technique [0002] CPVC resin is an important polymer material. According to different dispersion media, there are three main production methods of CPVC: solvent method, solid phase method and aqueous phase suspension method. Affected by environmental protection, energy consumption, process, etc., solvent method has been Basically eliminated. At present, domestic CPVC resins have two production methods: solid phase method and water phase suspension method, and the water phase suspension method is the main method. Internationally famous CPVC manufacturers also use this method as the main method. The specific steps of the water phase suspension method CPVC resin production process are as follows: suspend the PVC resin in water or hydrochloric acid solution, add initiator and dispersant, stir to ...

Claims

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Application Information

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IPC IPC(8): C08F14/06C08F8/22
Inventor 张学明孔秀丽贾小波肖恩琳李长春张强许永森孙丽朋
Owner CHINA PETROLEUM & CHEM CORP
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