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Preparation method of polyvinyl chloride resin special for chlorination

A technology of polyvinyl chloride resin and PVC resin, which is applied in the field of polymer materials, can solve problems such as high risk and complicated process, and achieve the effects of benefiting chlorination reaction, increasing specific surface area and shortening reaction time

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

[0028] A preparation method of special-purpose polyvinyl chloride resin for chlorination, comprising the following steps:

[0029] S1. Weigh 100g of SG-8 type 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 1g of methanol to the container and stir at 5°C for 1 Minutes, stirring speed 50 rev / min, obtain initial charge;

[0030] S2. Place the homogeneously mixed primary material of S1 at -20°C for freezing treatment, and the freezing time is 30 minutes; a large amount of water contained in the primary material particles is frozen into ice, the volume increases, and the internal pore diameter of the PVC resin particles expands;

[0031] S3. Put the frozen primary material of S2 into a microwave reactor for heating, the microwave power is 500w, and the heating time is 0.5 minutes; under the action of microwaves, the ice inside the PVC resin...

Embodiment 2

[0034] A preparation method of special-purpose polyvinyl chloride resin for chlorination, comprising the following steps:

[0035] S1. Weigh 100g of SG-5 PVC resin wet material with a water content of 10% after centrifugation in the water-phase polymerization PVC production system, and place it in a closed container with a stirring device; add 5g of the weight of the PVC resin wet material to the container ethanol, stirred at 60°C for 60 minutes, and the stirring speed was 1000 rpm to obtain the initial material;

[0036] S2. Place the uniformly mixed primary material of S1 at 0°C for freezing treatment, and the freezing time is 30 minutes; a large amount of water contained in the primary material particles is frozen into ice, the volume increases, and the internal pore diameter of the PVC resin particles expands;

[0037] S3. Put the frozen primary material of S2 into a microwave reactor for heating, the microwave power is 1500w, and the heating time is 30 minutes; under the ...

Embodiment 3

[0040] A preparation method of special-purpose polyvinyl chloride resin for chlorination, comprising the following steps:

[0041] S1. 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 1.5g of acetone of the weight of the PVC resin wet material to the container , stirring at 35°C for 30 minutes at a stirring speed of 500 rpm to obtain the initial material;

[0042] S2. Place the uniformly mixed primary material of S1 at -10°C for freezing treatment, and the freezing time is 60 minutes; a large amount of water contained in the primary material particles is frozen into ice, the volume increases, and the internal pore diameter of the PVC resin particles expands;

[0043] S3. Put the frozen primary material of S2 into a microwave reactor for heating, the microwave power is 900w, and the heating time is 1 minute; under the action of mi...

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PUM

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Abstract

The invention relates to the technical field of high polymer materials, and discloses a preparation method of polyvinyl chloride resin special for chlorination. The preparation method comprises the steps of adding a water-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 stirring and mixing, and carrying out freezing treatment, carrying out microwave heating on the frozen primary material at a low temperature, and drying to obtain the PVC resin special for chlorination. PVC resin wet material particles obtained through a water-phase polymerization method contain a large amount of water, the water becomes ice to expand the internal pore diameters of the PVCresin particles during freezing, the ice is sublimated into water vapor during microwave heating, the water vapor compresses the surrounding structures of the PVC resin particles at the early stage tobe closed, 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 is loose in particle structure, high in plasticizer oil absorption rate and large in specific surface area, can meet the production requirements of CPVC resin, and is more beneficial to chlorination reaction.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a preparation method of special-purpose polyvinyl chloride 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 r...

Claims

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Application Information

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IPC IPC(8): C08J9/28C08J3/28C08L27/06
CPCC08J9/28C08J3/28C08J2327/06C08J2201/0484
Inventor 张文学史万敬裴英鸽刘元戎饶栋周洪涛李开存张宇琪郭伟
Owner JINCHUAN GROUP LIMITED
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