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Method of preparing polypropylene graft polymer

A polypropylene grafting and polymer technology is applied in the field of polypropylene grafting polymer and solid-phase free radical grafting polymerization of polypropylene, which can solve the problems of increasing interfacial adhesion, reducing interfacial tension and poor compatibility.

Active Publication Date: 2011-03-16
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although polypropylene has many advantages such as good chemical stability, good electrical insulation, non-toxicity, and high-temperature cooking resistance, there are still some shortcomings: polypropylene is non-polar and crystalline, and other materials such as polarity The compatibility of polymers, inorganic fillers and metals is poor, and compatibilizers need to be added to reduce interfacial tension and increase interfacial bonding when used in combination
Since the reactivity of the carboxyl group is much lower than that of the anhydride group, this change has a negative impact on the application properties of the grafted product

Method used

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  • Method of preparing polypropylene graft polymer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0031] The polypropylene used in the present invention is a homopolymer of propylene, and the measured melt index is 3.25g (230° C., 10 minutes). Get a 500ml single-necked glass flask, and mix 100 grams of polypropylene, 4.62 grams of maleic anhydride, 5.5 grams of styrene and 0.4 grams of dibenzoyl peroxide in the flask. Then put the glass flask into an oven with a temperature of 90° C. to react for 4 hours. After cooling, the material in the flask is poured into a glass petri dish, put into a vacuum oven, and dried to a constant weight at a temperature of 80-85°C to obtain 109.68 grams of the product, and the conversion rate of the grafted monomer is 99.5%. The melt index is 1.85. It shows that the conversion rate of the grafted monomer in the method of the present invention is high, and the degradation reaction of polypropylene in the graft polymerization process is effectively simulated. Accurately weigh 5.004 grams of the grafted product, extract it with acetone for 24 ...

Embodiment 2

[0033] Take a 500ml single-necked glass flask, add 100 grams of polypropylene, 4.62 grams of maleic anhydride, 5.05 grams of vinyl acetate and 0.4 grams of dibenzoyl peroxide, and mix well. Then put the glass flask into a water bath with a temperature of 90° C., and react for 6 hours. After cooling, the material in the flask was poured into a glass petri dish, put into a vacuum oven, and dried to a constant weight at a temperature of 80-85°C to obtain 108.60 grams of the product, and the conversion rate of the grafted monomer was 99%. The melt index is 5.1. Accurately weigh 5.003 grams of the grafted product, extract it with acetone for 24 hours in a Soxhlet fat extractor, then dry it to constant weight in a vacuum oven at a temperature of 80-85 ° C, and the weight of the remaining product is 4.7741 grams. 56.5% of the monomers were converted to graft copolymers.

Embodiment 3

[0035] Take a 500ml three-neck glass flask equipped with mechanical stirring and put it into a water bath, add 100 grams of polypropylene, 2.31 grams of maleic anhydride, 3.0 grams of styrene and 0.2 grams of dibenzoyl peroxide, start stirring and mixing for 20 minutes . Set the temperature of the water bath to 90° C., and react for 6 hours. After cooling, the material in the flask is poured into a glass petri dish, put into a vacuum oven, and dried to a constant weight at a temperature of 80-85° C. to obtain 105.1 grams of the product, and the conversion rate of the grafted monomer is 99.8%. The melt index is 5.49. Accurately weigh 5.0024 grams of the grafted product, extract it with acetone for 24 hours in a Soxhlet fat extractor, then dry it to constant weight in a vacuum oven at a temperature of 80-85 ° C, and the weight of the remaining product is 4.8999 grams. 65.3% of the monomers were converted to graft copolymers.

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Abstract

The invention relates to a polypropylene graft polymer preparing method which is characterized in that: (a) calculated by weight parts, the polypropylene graft polymer comprises 100 parts of polypropylene, 0.1-20 parts of graft monomer maleic anhydride, 0.1-20 parts of graft monomer styrene monomer or vinyl acetate monomer, 0.01-10 parts of peroxide initiator and 1-20 parts of other vinyl monomers; (b) the graft monomers, the initiator and the polypropylene are evenly mixed; (c) the reactants are heated to reach a temperature of 70-120 DEG C and then react for 1-10 hours; and (d) after the reaction, the polypropylene graft polymer can be obtained through cooling. During the implementation of the method, no solvent, suspending medium or interfacial agent needs to be used, the obtained product can be applied without needing further treatment, for example, a compatilizer for a polypropylene composite material; and the obtained product is particularly used for improving the interfacial compatibility and dispersivity of inorganic filler and polyolefine. The conversion rate of the graft monomers of the invention is greater than 95 percent, and at least 55 percent of the graft monomers form graft polypropylene.

Description

Technical field: [0001] The invention belongs to the field of macromolecular materials, in particular to a graft modification method of polyolefin, more specifically to a solid-phase radical graft polymerization method of polypropylene, and a polypropylene graft polymer prepared by the method. Background technique: [0002] Since the invention of the Zigler-Natta catalyst in the 1950s, many important advances have been made in the structural design and aggregation regulation of polypropylene, such as the copolymer of ethylene / propylene and higher α-olefins, ethylene Copolymers with propylene, etc. In terms of polymerization technology and engineering, it has successively realized the industrialization of in-kettle toughening, spherical particles and wide distribution (bimodal or multimodal) polyolefins. However, the copolymerization of propylene and polar monomers, such as acrylic acid and its lipids, vinyl acetate and maleic anhydride, and the direct polymerization of high...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F222/06C08F255/00
Inventor 杨万泰马育红李卓商运生
Owner BEIJING UNIV OF CHEM TECH
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