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Method for solid phase grafting of maleic anhydride and polypropylene in supercritical CO#-[2] environment

A technology of maleic anhydride and solid-phase grafting is applied in the field of preparation of maleic anhydride grafted polypropylene, which can solve the problems of environmental pollution and the degradation of non-uniform graft products by grafting, and achieves solvent-free recovery and no environment. Low pollution and degradation effects

Inactive Publication Date: 2005-04-13
EAST CHINA UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved in the present invention is to disclose a supercritical CO 2 A method for grafting maleic anhydride to polypropylene solid phase in the environment, to overcome the shortcomings of the prior art such as solvent recovery, environmental pollution, uneven branching and serious degradation of grafted products

Method used

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  • Method for solid phase grafting of maleic anhydride and polypropylene in supercritical CO#-[2] environment
  • Method for solid phase grafting of maleic anhydride and polypropylene in supercritical CO#-[2] environment
  • Method for solid phase grafting of maleic anhydride and polypropylene in supercritical CO#-[2] environment

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Embodiment 1

[0033] Put polypropylene, maleic anhydride and initiator in the autoclave at a ratio of 100 / 3 / 1 by weight, fill the autoclave with low-pressure carbon dioxide to replace the air in the autoclave, and then fill with high-pressure carbon dioxide to increase the temperature of the reactor To 100°C, the pressure is controlled at 20.0MPa, swelling and permeating for 3 hours, and then the temperature of the reactor is raised to 120°C, and the pressure is 30.0MPa to react for 5 hours, the reactor is cooled and the pressure is released, and the grafted sample is taken out for purification and analysis and characterization . The grafting ratio measured by non-aqueous titration method is 0.72%. The GPC test was carried out on the grafted sample, and its average weight-average molecular weight was 94809.

[0034] Infrared spectrum see figure 1 , wherein: 1 is the raw material polypropylene; 2 is the grafted product.

[0035] 1850cm -1 , 1790cm -1 and 704cm -1 It is the carbonyl asy...

Embodiment 2

[0037] Put polypropylene, maleic anhydride and initiator in the autoclave at a weight ratio of 100 / 2 / 2, fill the autoclave with low-pressure carbon dioxide to replace the air in the autoclave, and then fill with high-pressure carbon dioxide to increase the temperature of the reactor To 40°C, the pressure is controlled at 8.0MPa, swelling and permeating for 5 hours, then the temperature of the reactor is raised to 150°C, the pressure is controlled at 10.0MPa and reacted for 2 hours, the reactor is cooled and the pressure is released, and the grafted sample is taken out for purification and analysis characterization. The grafting ratio measured by non-aqueous titration method is 0.37%. GPC test was carried out on the grafted samples, and its molecular weight distribution was as follows image 3 shown. Its average weight average molecular weight is 170513.

[0038] image 3It is the molecular weight distribution diagram of the raw material polypropylene and the grafted polypr...

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Abstract

The present invention discloses the process of solid phase grafting maleic anhydride onto polypropylene in supercritical CO2 environment. The grafting process includes the following steps: setting polypropylene, maleic anhydride and initiator in supercritical CO2 to swell and penetrate polypropylene; and subsequent reaction in supercritical CO2 for 1-5 hr to obtain the grafted product. The grafted product has grafting rate upto 0.5 %, reaching the grafting level of melting grafting, and no serious molecular weight degradation. The process of the present invention is simple, and has no solvent recovering, no environmental pollution, homogeneous grafting and less degradation of the grafted product.

Description

technical field [0001] The present invention relates to the preparation method of maleic anhydride grafted polypropylene, particularly relate to utilizing supercritical CO 2 The invention discloses a preparation method of graft-copolymerized maleic anhydride in swelling and permeable polypropylene. Background technique [0002] Polypropylene (PP) is one of the five general-purpose plastics. Through grafting modification, suitable polar branches are introduced into the molecular chain of polypropylene, which can improve its performance deficiencies and add new properties while maintaining the original excellent characteristics of polypropylene. Maleic anhydride is often used as a graft-modified monomer for polypropylene due to its strong polarity and difficulty in self-polymerization. The application of polypropylene maleic anhydride graft (MPP) mainly has the following aspects: (1) As an adhesive, it has strong adhesion to metal substrates and other polar materials. (2) A...

Claims

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Application Information

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IPC IPC(8): C08F255/02
CPCY02P20/54
Inventor 刘涛赵玲陈淼灿曹贵平许志美朱中南袁渭康
Owner EAST CHINA UNIV OF SCI & TECH
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