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Method for preparing unsaturated carboxylic acid grafted polypropylene copolymer

A grafted polypropylene, unsaturated technology, applied in the field of preparation of organic macromolecular polymers, can solve the problems of operator eye and skin damage, easy volatilization or sublimation, difficulty in actual production, etc., and achieves low operating pressure and post-processing. Simple, high grafting effect

Inactive Publication Date: 2012-07-25
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Currently commonly used polypropylene solid-phase grafting monomers mainly include maleic anhydride, glycidyl methacrylate, acrylic acid, methacrylic acid, methyl methacrylate, etc. These monomers often have greater toxicity, and the boiling point Low, volatile or sublimated, causing serious damage to the eyes and skin of field operators, and bringing difficulties to actual production

Method used

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  • Method for preparing unsaturated carboxylic acid grafted polypropylene copolymer
  • Method for preparing unsaturated carboxylic acid grafted polypropylene copolymer
  • Method for preparing unsaturated carboxylic acid grafted polypropylene copolymer

Examples

Experimental program
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Effect test

Embodiment 1

[0030] Dissolve 300 parts by weight of unsaturated carboxylic acid grafting monomer 1-acryloylpyrrolidine-2-carboxylic acid in 280 parts of N, N-dimethylformamide, 100 parts of initiator dibenzoyl peroxide Soluble in 770 parts of interface agent xylene, in N 2 The two solutions were added under atmosphere to a reaction apparatus already charged with 300 parts of copolymerized polypropylene particles and 700 parts of auxiliary grafted monomer styrene. React at 110±2° C. for 30 minutes, cool, filter, wash with methanol and acetone respectively, and dry in vacuum to obtain the final grafted product with a grafting rate of 14.3%.

[0031] The method for measuring the grafting rate of unsaturated carboxylic acid in the grafted product of modified polypropylene is a titration method, and the specific method is as follows: firstly, the grafted product is extracted with acetone and methanol for 24 hours to remove possible residual styrene and Unsaturated carboxylic acid homopolymer. ...

Embodiment 2

[0036] Dissolve 150 parts by weight of unsaturated carboxylic acid grafting monomer 1-acryloylpyrrolidine-2-carboxylic acid in 280 parts of N, N-dimethylformamide, 100 parts of initiator dibenzoyl peroxide Soluble in 770 parts of interface agent xylene, in N 2 The two solutions were added under atmosphere to a reaction apparatus already charged with 300 parts of copolymerized polypropylene particles and 350 parts of auxiliary grafted monomer styrene. React at 110±2° C. for 30 minutes, cool, filter, wash with methanol and acetone respectively, and dry in vacuum to obtain the final grafted product with a grafting rate of 6.7%.

Embodiment 3

[0038] Dissolve 45 parts by weight of unsaturated carboxylic acid grafting monomer 1-acryloylpyrrolidine-2-carboxylic acid in 280 parts of N, N-dimethylformamide, 100 parts of initiator dibenzoyl peroxide Soluble in 770 parts of interface agent xylene, in N 2 The two solutions were added under atmosphere to a reaction apparatus already charged with 300 parts of copolymerized polypropylene particles and 105 parts of auxiliary grafted monomer styrene. React at 110±2° C. for 30 minutes, cool, filter, wash with methanol and acetone respectively, and vacuum-dry to obtain the final grafted product with a grafting rate of 5.1%.

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Abstract

The invention provides a method for preparing an unsaturated carboxylic acid grafted polypropylene copolymer, which includes the steps: dissolving 45-300 parts by weight of unsaturated carboxylic acid grafting monomers into 280 parts by weight of N, N-dimethyl formamide, dissolving 100 parts by weight of dibenzoyl peroxide into 770 parts by weight of dimethylbenzene, mixing the solutions with 300parts by weight of polypropylene granules and 45-700 parts by weight of styrene, mixing the mixture for one hour at the room temperature in the N2 (nitrogen) atmosphere, and carrying out a reaction for 0.5-2 hours at the temperature of 100-130 DEG C to obtain a product. The method is simple in process, free of environmental pollution and easy in aftertreatment, and grafted polypropylene containing amino acid residues has excellent biocompatibility.

Description

technical field [0001] The invention relates to a method for preparing an organic polymer, in particular to a method for grafting and modifying polypropylene. Background technique [0002] Polypropylene has the advantages of high melting point, good heat resistance, low density, excellent mechanical properties and good chemical stability, etc. It is widely used in packaging materials, mechanical parts, household appliances, medical equipment, synthetic fibers and other fields. In the last 20 years, polypropylene has continued to maintain the fastest development rate among general plastics. [0003] Although polypropylene has many advantages, polypropylene also has some disadvantages. The biggest disadvantage is poor cold resistance, brittle at low temperature; followed by large shrinkage, poor creep resistance, poor dimensional stability of products, and prone to warping deformation; compared with traditional engineering plastics, polypropylene also has poor weather resista...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F220/58C08F220/60
Inventor 徐晓冬常秀娟邱蕾蕾张立芬李林萍朱元棋
Owner HARBIN ENG UNIV
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