Preparation method of high-performance chlorinated polyvinyl chloride for injection molding

A chlorinated polyvinyl chloride, high-performance technology, applied in the chemical field, can solve the problems of poor uniformity of CPVC resin particles, large static electricity of CPVC resin particles, and increased waste water treatment costs, etc. cost effect

Active Publication Date: 2021-04-13
山东高信化学股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In summary, the CPVC resin prepared by the aqueous phase suspension method in the prior art has the following problems: the uniformity of the CPVC resin particles is poor; the CPVC resin particles have large static electricity, poor fluidity, and difficult processing; chemical initiators are used, and the pollution is high and increases waste water treatment cost

Method used

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  • Preparation method of high-performance chlorinated polyvinyl chloride for injection molding
  • Preparation method of high-performance chlorinated polyvinyl chloride for injection molding

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The preparation method of high-performance chlorinated polyvinyl chloride for injection molding comprises the following steps:

[0029] (1) Ingredients

[0030] Install a UV lamp in a 5m³ reactor;

[0031] Add 3800 Kg of 10% hydrochloric acid aqueous solution, 900 Kg of PVC resin with a degree of polymerization of 900, 2.5 Kg of dispersant polyvinyl alcohol, and stir at a speed of 80 r / min to disperse the PVC resin evenly in the water phase.

[0032] (2) Exhaust

[0033] Nitrogen gas was introduced into the reaction kettle to carry out degassing, and the degassing time was 20 minutes.

[0034] (3) Vacuum treatment

[0035] After degassing, the reactor is vacuumed to a pressure of -0.05MPa.

[0036] (4) Chlorination

[0037] A. The first stage of chlorination

[0038] Raise the temperature of the reactor to 80°C, turn on the ultraviolet lamp, and start to feed chlorine gas; the temperature rise rate is 4°C / 15min to 100°C, the rate of chlorine flow is 2.4Kg / min, the...

Embodiment 2

[0053] Using the same method as in Example 1, the intensity of ultraviolet light irradiated by the ultraviolet lamp was changed to 210uW / cm².

Embodiment 3

[0055] Using the same method as in Example 1, the intensity of ultraviolet light irradiated by the ultraviolet lamp was changed to 230uW / cm².

[0056] Table 1 Example 1-3 made CPVC resin performance index test results

[0057]

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Abstract

The invention discloses a preparation method of high-performance chlorinated polyvinyl chloride for injection molding, which comprises a batching step, a chlorination step, and a chlorinated polyvinyl chloride slurry treatment step; The irradiation method of the ultraviolet lamp is segmented irradiation, and the intensity of the ultraviolet light irradiated by the ultraviolet lamp is 160-230 uW / cm². The preparation method also includes adding a dispersant, and the dispersant is added in two times, and the time of the two additions is the ingredients. step and chlorination step, the total dosage of dispersant is 0.1-0.4% of the quality of PVC resin. Compared with the prior art, the uniformity of the chlorinated polyvinyl chloride resin particles is improved, the oil absorption rate of the resin is increased, and the plasticization is easy; the thermal stability of the CPVC resin is improved, the static electricity between the materials is reduced, and the outflow of the CPVC resin particles is reduced. Time, improve the fluidity of the resin; abandon the use of chemical initiators, reduce pollution and reduce wastewater treatment costs.

Description

technical field [0001] The invention relates to a preparation method of chlorinated polyvinyl chloride, in particular to a preparation method of high-performance chlorinated polyvinyl chloride for injection molding, and belongs to the technical field of chemical industry. Background technique [0002] CPVC resin is obtained by chlorination modification of PVC. The chlorine content is generally 61-73%. It has excellent corrosion resistance, heat resistance, and mechanical processing performance. Pipes, pipe fittings, injection molded parts are widely used in construction, chemical industry, electric power, fire protection and other fields. Injection molding is that granular or powdery raw materials are heated and melted into a fluid state and enter the mold cavity at one time to harden and shape. Therefore, CPVC resin for injection molding requires higher uniformity and fluidity. [0003] At present, the production technology of CPVC at home and abroad mainly adopts the aque...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F8/22C08F14/06
CPCC08F8/22C08F14/06
Inventor 张道同金胜波胡海波孙猛侯兰明
Owner 山东高信化学股份有限公司
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