A kind of preparation method of aqueous phase suspension method cpvc resin

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: 2018-11-13
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 chlorinable PVC resin QS-C60 with a degree of polymerization of 800 to 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, the ultrasonic device is turned off. Add 150g of peroxydicarbonate with a concentration of 40%, use chlorine to exhaust the air in the kettle, heat up the reactor, slowly pass in chlorine, and turn on the ultrasonic device. When the temperature of the reactor reaches about 85°C, the chlorination reaction will accelerate and control The temperature of the reactor is 100℃, the chlorine flow rate is controlled to be 50g / min, the pressure of the reactor is maintained at 0.3MPa, and the ultrasonic device is turned off after the chlorination reaction for 20 minutes. When the chlorine flow reaches 6.8kg, the chlorine flow is stopped and a 20% terminator is added. After 10 minutes of 300 g of diethylhydroxylamine, ...

Embodiment 2

[0027] Add 80kg of deionized water and 15kg of chlorinable PVC resin QS-C65 with a degree of polymerization of 850 to 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%, use chlorine to exhaust the air in the kettle, heat up the reactor, slowly pass in chlorine, and turn on the ultrasonic device. When the temperature of the reactor reaches about 85℃, the chlorination reaction will accelerate and control The temperature of the reactor is 95℃, the chlorine flow rate is controlled at 60g / min, the pressure of the reactor is kept at 0.3MPa, after the chlorination reaction for 15 minutes, the ultrasonic device is turned off, when the chlorine flow reaches 10kg, the chlorine flow is stopped, and 20% terminator acetone is added. After 10 minutes, 400 g of thiosemicarbazone was vacuumed to ...

Embodiment 3

[0029] Add 80kg of deionized water and 18kg of chlorinable PVC resin QS-C65 with a degree of polymerization of 900 to 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 40% peroxydicarbonate and dibenzoyl peroxide, use chlorine to exhaust the air in the kettle, heat up the reactor, slowly pass in chlorine, and turn on the ultrasonic device. The temperature of the reactor reaches about 85℃ When the chlorination reaction is accelerated, control the temperature of the reactor at 105℃, control the chlorine flow rate of 7.2g / min, and keep the pressure of the reactor at 0.3MPa. After the chlorination reaction for 20 minutes, turn off the ultrasonic device. When the chlorine flow reaches 12.5kg, stop Chlorine, add 200g of 20% terminator compound heat-resistant terminator, 10 minutes later, vacuumize the remaining chlorine,...

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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] A preparation method of CPVC resin by an aqueous suspension method belongs to the technical field of CPVC preparation. Background technique [0002] CPVC resin is an important polymer material. Depending on the dispersion medium, there are three main production methods for CPVC: solvent method, solid phase method and water phase suspension method. The solvent method has been affected by environmental protection, energy consumption, and technology. Basically eliminated. At present, domestic CPVC resin has two production methods: solid phase method and aqueous phase suspension method, and the main method is aqueous phase suspension method. Internationally renowned CPVC production enterprises also use this method as the main method. The specific steps of the production process of CPVC resin by the aqueous suspension method are as follows: Suspend the PVC resin in water or hydrochloric acid solution, add initiator and dispersant, stir to suspend the PVC resin i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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