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Preparation method of PVC resin special for chlorination

A PVC resin and particle technology, applied in the field of polymer materials, can solve the problems of complex process and high risk, and achieve the effects of simple and easy process, high oil absorption rate of plasticizer and large specific surface area

Pending Publication Date: 2020-12-04
JINCHUAN GROUP LIMITED
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The preparation of PVC resin for chlorination is mostly achieved by adjusting the polymerization conditions of vinyl chloride, such as adjusting the type and proportion of dispersants, adding surfactants, etc., and the polymerization conditions and processes of vinyl chloride need to be adjusted, which has the problems of high risk and complicated process

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A preparation method of special PVC resin for chlorination, comprising the following steps:

[0024] Step 1. Weigh 100g of SG-8 PVC resin wet material with a water content of 5% after centrifugation in the water-phase polymerization PVC production system, and place it in a closed container with a stirring device; add 0.5g of methanol to the container at 5°C Stir for 1 minute, and the stirring speed is 50 rpm to obtain the initial material;

[0025] Step 2. Put the homogeneously mixed primary material in step 1 into a microwave reactor for heating. The microwave power is 900w, and the heating time is 1 minute. Rapidly increasing, compressing the structure around the PVC resin particles close together at the initial stage, breaking through the shackles of the outer film of the PVC particles in the later stage, and quickly escaping, so that the internal pore size of the PVC particles increases again, and a large number of holes are formed after the water vapor escapes, whi...

Embodiment 2

[0028] A preparation method of special PVC resin for chlorination, comprising the following steps:

[0029] Step 1, take by weighing 100g of the SG-5 type PVC resin wet material with a water content of 25% after centrifugation in the PVC production system of the aqueous phase polymerization method, and place it in a closed container with a stirring device; add 1.5g of ethanol to the container, and Stir at 35°C for 30 minutes at a stirring speed of 500 rpm to obtain the initial material;

[0030] Step 2. Put the uniformly mixed primary material in step 1 into a microwave reactor for heating. The microwave power is 2000w, and the heating time is 10 minutes. Rapidly increasing, compressing the structure around the PVC resin particles close together at the initial stage, breaking through the shackles of the outer film of the PVC particles in the later stage, and quickly escaping, so that the internal pore size of the PVC particles increases again, and a large number of holes are f...

Embodiment 3

[0033] A preparation method of special PVC resin for chlorination, comprising the following steps:

[0034] Step 1. Weigh 100g of SG-5 PVC resin wet material with a water content of 15% after centrifugation in the PVC polymerization production system, and place it in a closed container with a stirring device; add 1.0g of the weight of the PVC resin wet material to the container Acetone was stirred at 25°C for 10 minutes at a stirring speed of 100 rpm to obtain the initial material;

[0035] Step 2. Put the homogeneously mixed primary material in step 1 into a microwave reactor for heating. The microwave power is 1200w, and the heating time is 5 minutes. Rapidly increasing, compressing the structure around the PVC resin particles close together at the initial stage, breaking through the shackles of the outer film of the PVC particles in the later stage, and quickly escaping, so that the internal pore size of the PVC particles increases again, and a large number of holes are for...

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Abstract

The invention relates to the technical field of high polymer materials, and discloses a preparation method of PVC resin special for chlorination. The preparation method comprises the steps of adding awater-containing PVC resin wet material centrifuged by a PVC polymerization production system into a closed container with a stirring function, adding a functional organic solvent, uniformly stirringand mixing, carrying out microwave heating and drying on the uniformly mixed primary material, and obtaining the PVC resin special for chlorination. PVC resin wet material particles obtained througha water-phase polymerization method contain a large amount of water, the water is changed into water vapor during microwave heating, the water vapor compresses surrounding structures of the PVC resinparticles to be closed at the initial stage, breaks through constraint of the PVC resin particles and outer membranes of the particles at the later stage, and escapes rapidly. The resin special for chlorination, which is loose in particle structure, high in plasticizer oil absorption rate and large in specific surface area, is obtained, the production requirements of CPVC resin can be met, and chlorination reaction is more facilitated to be carried out.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of a special-purpose PVC resin for chlorination. Background technique [0002] Chlorinated polyvinyl chloride (CPVC) resin introduces chlorine atoms into the molecular structure of PVC resin through chlorination reaction, increasing the chlorine content from 56% of ordinary PVC resin to 61%~75%. The increase of chlorine content improves the performance of PVC resin, making it have good chemical corrosion resistance, flame retardancy and insulation, and the heat resistance is much better than PVC resin, so that CPVC resin can be used in chemical industry , Building materials, metallurgy, shipbuilding, electrical appliances and adhesives. [0003] The preparation of CPVC resin requires the use of special chlorinated special PVC resin. The development of chlorinated special PVC resin is one of the difficulties in the production of CPVC resin. PVC is...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/28C08J3/28C08L27/06
CPCC08J9/28C08J3/28C08J2327/06C08J2201/0504
Inventor 张文学史万敬裴英鸽刘元戎饶栋周洪涛李开存张宇琪
Owner JINCHUAN GROUP LIMITED
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