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A kind of preparation method of chlorinated polyvinyl chloride for paint, coating and fiber

A chlorinated polyvinyl chloride, paint technology, applied in the chemical characteristics of fibers, coatings, textiles and papermaking, etc., can solve the problems of long time, large nitrogen consumption, long time for normal pressure acid blowing, etc., to achieve investment and steam Reduced consumption, increased production capacity and considerable economic benefits

Active Publication Date: 2016-04-20
LIAONING FANGDA ENG DESIGN CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problems existing in the current solution chlorination process include: raw material polyvinyl chloride and solvent selection are not reasonable enough, the dissolving sequence of the initiator after polyvinyl chloride should be changed, the acid blowing time at normal pressure is long, the nitrogen consumption is large, and the normal pressure Solvent recovery by distillation, high steam consumption, long time, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0024] Chlorinated polyvinyl chloride for the preparation of paints. at 5m 3 Add chlorinated benzene (chlorinated benzene content > 99.2W / %, polychlorobenzene content ≤ 0.65W / % moisture content ≤ 5 × 10 -5 mass fraction) 3.96 tons, add 0.772 kg of azobisisobutyronitrile, and start stirring until the initiator is completely dissolved in chlorobenzene. Slowly add 396 kg of PVC (polymerization degree 900, oil absorption rate 28), cover the reaction kettle, vacuumize the polymerization kettle to a vacuum degree of 0.08Mpa, and break the vacuum to normal pressure with 0.1Mpa nitrogen. Start to heat up, and control the temperature rise rate to 2°C / min. When the temperature in the reactor is 35°C, the chlorine flow is started, and the chlorine flow rate is 36m 3 / h. When the temperature in the reactor reaches 90°C, increase the chlorine flux to 64m 3 / h. It is advisable that the tail gas basically does not discharge chlorine. When the reaction temperature reached 95°C, the tempe...

example 2

[0029] Chlorinated polyvinyl chloride for the preparation of fibers. at 5m 3 Add chlorinated benzene (chlorinated benzene content > 99.2W / %, polychlorobenzene content ≤ 0.65W / % moisture content ≤ 5 × 10 -5 mass fraction) 3.916 tons, add 0.484 kg of azobisisobutyronitrile, and start stirring until the initiator is completely dissolved in chlorobenzene. Slowly add 484 kg of PVC (polymerization degree 1400, oil absorption rate 32), cover the reaction kettle, vacuumize the polymerization kettle to a vacuum degree of 0.08Mpa, and break the vacuum to normal pressure with 0.1Mpa nitrogen. Start to heat up, and control the temperature rise rate to 2°C / min. When the temperature in the reactor is 35°C, the chlorine flow is started, and the chlorine flow rate is 36m 3 / h. When the temperature in the reactor reaches 90°C, increase the chlorine flux to 64m 3 / h. It is advisable that the tail gas basically does not discharge chlorine. When the reaction temperature reached 95°C, the tem...

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PUM

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Abstract

The invention discloses a preparation method of chlorinated polyvinyl chloride for a paint, a coating and a fiber, and relates to the preparation method of the chlorinated polyvinyl chloride. The method comprises the following processes: dissolving an initiator into a solvent; dissolving polyvinyl chloride (PVC) into a solution, so as to form a PVC solution; vacuumizing and deoxidizing a reactor; introducing vaporized chlorine to chloridize; then blowing acid by nitrogen, so as to obtain chloridized liquid for water analysis; separating out the chloridized resin from a solvent phase by using hot water; preparing vinylidene chloride resin by dewatering and drying; separating out a solvent chlorobenzene from water by distillation of water vapor and recycling. By adopting the method, excellent PVC is taken as the raw material; the chlorobenzene is selected as the solvent; chlorination is carried out under the effects of the initiator and certain temperature, so as to obtain excellent vinylidene chloride resin for the paint, the coating and the fiber. By adopting special process technologies and conditions for acid blowing and chlorobenzene solvent recovery, the production capacity of the device is greatly increased; the investment and steam consumption are significantly reduced; the economic benefit is considerable.

Description

technical field [0001] The invention relates to a preparation method of chlorinated polyvinyl chloride, in particular to a preparation method of chlorinated polyvinyl chloride for paint, coating and fiber. Background technique [0002] Chlorinated polyvinyl chloride (also known as perchlorinated vinyl resin) for paints, coatings and fibers is obtained by chlorination and modification of polyvinyl chloride (PVC) resin, and is a high-quality base material for paints and coatings. The product is white or light yellow tasteless, odorless, non-toxic loose granules or powder. After the PVC resin is chlorinated, the irregularity of the molecular chain arrangement increases and the polarity increases, which increases the solubility of the resin. It can be dissolved in ketones, esters, chlorinated hydrocarbons, nitro, toluene at room temperature. , Xylene and other organic solvents, soluble in benzene, aniline, dibutyl phthalate, carbon tetrachloride, etc. under heating; chemical st...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F14/06C08F8/22C09D127/24D01F6/10D01F6/32
Inventor 薛之化陈淑艳徐志学安立凯张雅娟魏勇贾绍林刘岩峰齐丽姝王必君
Owner LIAONING FANGDA ENG DESIGN CO LTD