Preparation method for chlorinated polypropylene resin

A technology of chlorinated polypropylene and polypropylene, which is applied in the field of preparation of chlorinated polypropylene resin, can solve the problems of low output, low yield, and poor safety of chlorinated polypropylene, achieve solvent recycling, simple operation, and environmental friendliness Effect

Active Publication Date: 2013-09-04
广州合成材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the hottest research in China is the technology of replacing carbon tetrachloride with chloroform, but the solubility of polypropylene dissolved in chloroform is low. High requirements on reaction equipment, poor safety, and there is also the problem of carbon tetrachloride, which is limited by the reaction between chloroform and chlorine gas; the mixed solvent method of chloroform and water also has poor solubility for polypropylene and uneven chlorination products , low output and other issues
[0005] Up to now, the industry has not found a suitable solvent to replace carbon tetrachloride in the solvent method to generate chlorinated polypropylene

Method used

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Examples

Experimental program
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Effect test

preparation example Construction

[0021] A preparation method for chlorinated polypropylene resin, comprising the following steps:

[0022] 1) Put the polypropylene raw material into the reaction kettle with xylene, and heat the temperature in the kettle to 80~140℃ under the condition of stirring, and keep it warm for 1~4 hours to make the polypropylene material swell in xylene , then add a lattice breaker to xylene, disperse it evenly in xylene, then add an initiator to initiate the reaction, react for 1-5h, then add a mixture of emulsifier and water, mix and disperse for 0.5-3h, and then The reaction solution is filtered, washed with water, and dried to obtain polypropylene nano powder;

[0023] 2) Dissolve the polypropylene nanopowder in the mixed solvent formed by trichloroethane and water, raise the temperature to 70~125℃ under the condition of stirring, then add the initiator, after the initiator is uniformly dispersed in the solution, Chlorine gas is passed into it for 0.5-3h to react, the reaction by-...

Embodiment 1

[0031] In the 2000L reactor, drop into 200kg polypropylene and 400L xylene, then under the condition of stirring, heat up to 120 ℃, drop into 2.5kg maleic anhydride, after waiting to stir evenly, drop into 1kg benzoyl peroxide in the reactor, Keep warm for 3 hours, then put 1200L of distilled water with 0.4kgOP-10 into the reactor (the total volume of emulsifier and distilled water is 1200L), stir for half an hour, filter, and dry to obtain nano-sized polypropylene white powder; detected by TEM , The particle size of the powder is 30-80nm.

[0032] Put the above-prepared nano-sized polypropylene white powder, 1000L trichloroethane and 400L distilled water into the reaction kettle, raise the temperature to 90°C under stirring conditions, put in 0.5kg of azobisisobutyronitrile and stir for 15 minutes, then Fill the still with 65kg of chlorine gas, after reacting for 1 hour, reduce the temperature in the still to 50°C, use nitrogen to purge the unreacted chlorine in the still, th...

Embodiment 2

[0034] Put 150kg of polypropylene and 320L of xylene into a 2000L reactor, then raise the temperature to 125°C while stirring, and put in 1.6kg of maleic anhydride. After stirring evenly, put 0.75kg of benzoyl peroxide into the reactor , keep warm for 3.5 hours, then put 1200L of distilled water equipped with 0.3kg Tween 80 into the reaction kettle, stir for half an hour, filter, and dry to obtain nano-sized polypropylene white powder; the particle size of the powder is 30-80nm as detected by TEM .

[0035] Put the nano-scale polypropylene white powder prepared above, 1000L trichloroethane and 200L distilled water into the reactor, under stirring conditions, heat up to 95°C, drop in 0.5kg benzoyl peroxide and stir for 15 minutes, then add Fill the kettle with 65kg of chlorine gas, and after reacting for 1 hour, lower the temperature in the kettle to 60°C, purge the unreacted chlorine gas in the kettle with nitrogen, then lower it to room temperature, stop stirring, let the chl...

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Abstract

The invention discloses a preparation method for chlorinated polypropylene resin. The preparation method comprises the following steps of: (1) fully swelling polypropylene in a solvent, adding a lattice destructive agent, uniformly dispersing the lattice destructive agent in the solvent, adding an initiator to initiate reaction, adding the mixture of an emulsifier and water, fully mixing and dispersing to form emulsion, and filtering, washing the emulsion with water and drying the emulsion to obtain polypropylene powder; and (2) dissolving the polypropylene powder into a mixed solvent formed by trichloroethane and water, fully mixing and dispersing, heating, adding the initiator, introducing a chlorine gas to react after mixing and dispersing the initiator uniformly, removing the residual chlorine gas from the liquid after the chlorination degree reaches a set value, and obtaining the chlorinated polypropylene resin by performing two-phase separation, washing with water, neutralizing, drying and crushing. The chlorinated polypropylene produced by the invention is chlorinated uniformly, and can be fully dissolved in the solvents such as dimethylbenzene, methylbenzene, ketone solvents and environment-friendly butyl acetate solvents. In addition, through the preparation method disclosed by the invention, the product with controllable chlorination degree can be prepared.

Description

technical field [0001] The invention discloses a preparation method of chlorinated polypropylene resin. Background technique [0002] Chlorinated polypropylene (CPP for short) is one of the important chemically modified products of polypropylene. It is widely used in coatings, ink vehicles, adhesives, etc., and has a large market demand. [0003] Chlorinated polypropylene is produced by chlorination of polypropylene. According to the specific process of chlorination reaction, it can be divided into solvent method, solid phase method and aqueous phase suspension method. The solvent method is one of the most commonly used methods for industrial production of CPP in the past. The process is to dissolve polypropylene in carbon tetrachloride, add a small amount of initiator, and pass chlorine gas under certain conditions for substitution reaction. Chlorinated polypropylene is obtained after drying to remove the solvent. The solid-phase method is to place polypropylene dry powde...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F10/06C08F8/22
Inventor 樊小军杨育农王浩江王庆谭卓华
Owner 广州合成材料研究院有限公司
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