Method for preparing chlorinated polypropylene by heterogeneous mixed solvent method

A technology of chlorinated polypropylene and mixed solvents, which is applied in the field of industrialized production of chlorinated polypropylene, can solve the problems of reducing the reaction temperature and pressure of the solvent method, and achieve the effects of cost-environmental friendliness, low cost, and reduction of reaction temperature and pressure

Inactive Publication Date: 2008-12-31
BEIJING UNIV OF CHEM TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, chloroform is used to prepare polypropylene particles for reaction and chlorinated polypropylene as a dissolved product, and water is used to absorb the hydrogen chloride of chlorination reaction and can prevent the reaction of chloroform and chlorine gas. This method combines the solvent method and aqueous phase of chlor

Method used

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  • Method for preparing chlorinated polypropylene by heterogeneous mixed solvent method
  • Method for preparing chlorinated polypropylene by heterogeneous mixed solvent method

Examples

Experimental program
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Example Embodiment

[0022] Example 1:

[0023]Put 1200kg (800L) of chloroform, 24kg of isotactic polypropylene and 0.6kg of Span80 into the 2000L enamel reactor A, then, under agitation, raise the temperature of the materials in the kettle to 100°C and keep it at this temperature 1 Within hours, the polypropylene was completely dissolved in chloroform. While the reactor A is heating up and keeping warm, 1200kg (800L) of chloroform and 0.6kg of Span80 are put into the reactor B, and kept at room temperature for later use. After the temperature of the materials in the reactor A is finished, press the chloroform in the reactor B into the reactor A with compressed air. At this time, the temperature of the materials in the reactor A will be reduced to between 50°C and 55°C. The polypropylene is made of fine particles. The form precipitated from chloroform. Maintain the temperature at 50°C, then put 0.12kg of azobisisobutyronitrile and 5% of 60kg (60L) dilute hydrochloric acid into the reaction kettle and ...

Example Embodiment

[0024] Example 2:

[0025] Put 960kg (640L) of chloroform and 140kg of isotactic polypropylene into a 2000L enamel reactor A. Then, under agitation, raise the temperature of the materials in the kettle to 115°C and keep it at this temperature for 3 hours to make polymerization Propylene is completely dissolved in chloroform. While the reactor A is warming up and keeping warm, put 960 (640L) chloroform into the reactor B and keep it at room temperature for later use. After the temperature of the materials in the reactor A is finished, press the chloroform in the reactor B into the reactor A with compressed air. At this time, the temperature of the materials in the reactor A will be reduced to between 55℃-60℃. The form precipitated from chloroform. Maintain the temperature at 55°C. Then put 0.7kg of azobisisobutyronitrile and 320kg (320L) of water into the reactor and stir for 15 minutes, and then pass 156kg of chlorine gas into the reactor to react. After the reaction, the unreacte...

Example Embodiment

[0026] Example 3:

[0027] Put 1050kg (700L) of chloroform, 210kg of syndiotactic polypropylene and 10.5kg of Span80 into a 2000L enamel reactor A, then, under agitation, raise the temperature of the materials in the kettle to 130°C and keep them at this temperature 6 Within hours, the polypropylene was completely dissolved in chloroform. While the reactor A is heating up and keeping warm, 840 kg (560 L) of chloroform and 8.4 kg of Span 80 are put into the reactor B, and kept at room temperature for later use. After the temperature of the materials in the reactor A is finished, use compressed air to quickly press the chloroform in the reactor B into the reactor A. At this time, the temperature of the materials in the reactor A will be reduced to between 65°C and 70°C. The form of precipitated out from chloroform. Continue to lower the temperature to 61.5°C, then put 0.63kg of benzoyl peroxide and 630kg (630L) of water into the reactor and stir for 25 minutes, and then pass 420kg o...

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Abstract

A method for preparing chlorinated polypropylene through heterogeneous component solvent belongs to chemical field of polymer modification. The method includes the following steps: putting polypropylene and Span80 into a reaction kettle which is added with chloroform; blending and heating the mixture to 100-150 DEG C and then thermally insulating for 1-10 hours; wherein the polypropylene is 1-20% the weight of chloroform and the Span80 is 0-1%the weight of chloroform; after thermal insulation, adding chloroform with the same amount and the same concentration as the Span80 into the reaction kettle, after which the temperature will drop to below 70 DEG C and polypropylene particulates will be separated out; adding water and evocating agent into the reaction kettle, blending the mixture to be even and introducing chlorine when the temperature is between 40 DEG C and 61.5 DEG C; after the reaction, blowing out the unreacted chlorine through compressed air or nitrogen gas; post-processing the chloride solution to get chlorinated polypropylene which contains 25-50wt% chlorine. The dissolution liquid of the finished product of the chlorinated polypropylene is clear and bright with no suspension or sediment. The method is simple and is pollution-free and low in cost and solves the problem that chloroform can not replace carbon tetrachloride to heterogeneously produce chlorinated polypropylene under low temperature.

Description

technical field [0001] The invention relates to the field of polymer modification chemical industry, and relates to a new method for industrial production of chlorinated polypropylene. It is characterized by the principle and industrialization method of preparing chlorinated polypropylene under heterogeneous conditions by using polypropylene fine particles prepared from industrial polypropylene pellets and chloroform and chlorine gas as raw materials, and using chloroform and water as mixed solvents. Background technique [0002] Chlorinated polypropylene is a chlorinated high polymer obtained by chlorinating polypropylene, which is mainly used in the production of composite inks, adhesives and anti-corrosion coatings. At present, the industrial production of chlorinated polypropylene adopts the solvent method production process. This method is to dissolve polypropylene in carbon tetrachloride at a temperature of 120 ° C and a pressure of 0.2 MPa, and then dissolve it in the...

Claims

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Application Information

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IPC IPC(8): C08F8/22C08F110/06
Inventor 李春喜陆颖舟孙爱军谭魁龙朱沛
Owner BEIJING UNIV OF CHEM TECH
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