Polyolefin grafting method

A polyolefin and grafting monomer technology, applied in the field of polyolefin solid-phase graft modification, can solve the problems of difficult product purification, limited raw material sources, etc., to achieve improved product purity, high product grafting rate, and reduced side reactions Effect

Active Publication Date: 2015-01-14
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both CN1948356 and CN1884326 disclose the method of suspended solid-phase grafting modified polypropylene, the former is a reaction carried out in water suspension, the product is difficult to purify, and the polypropylene used in the latter is a porous particle, which limits the source of raw materials

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0021] The preparation method of wax-coated peroxide microcapsules uses low-molecular alcohol as a solvent, the mass ratio of low-molecular alcohol to the total amount of peroxide and wax is 3:1~6:1, and the temperature is 50°C~90°C , dissolve the wax, add non-ionic surfactant, then add peroxide, stir evenly (control stirring speed 3000~8000r / min), cool down to 25℃~30℃, remove solvent by vacuum filtration, blow dry with nitrogen to obtain wax Coated with peroxide microcapsules.

[0022] Further, low molecular alcohol is used as solvent, and the mass ratio of low molecular alcohol to peroxide and the total amount of wax is 3:1~6:1. Dissolve the mixture, add non-ionic surfactant, the state is translucent, then add peroxide powder, control the stirring speed 5000~8000r / min, cool down to 25°C~30°C, remove the solvent by vacuum filtration, blow dry with nitrogen, Wax-coated peroxide microcapsules are obtained.

[0023] Among them, the low molecular weight alcohol acts as a solven...

Embodiment 1

[0040] The reaction temperature is 140°C~150°C, the reaction time is 40~45min, and the stirring speed is 100~110r / min.

Embodiment 2

[0042] The reaction temperature is 100°C~110°C, the reaction time is 30~35min, and the stirring speed is 140~150r / min.

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PUM

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Abstract

The invention discloses a polyolefin grafting method. According to the invention, polyolefin, a graft monomer and an interfacial agent are added into a stirring reactor, an initiator is added after a reaction temperature is reached, the reaction temperature is smaller than a glass transition temperature of polyolefin, a solid phase grafting process is utilized for a reaction, and the initiator is a wax-wrapped peroxide microcapsule; the wax-wrapped peroxide microcapsule can be easily dispersed on the surface of a polyolefin particle, which enables reaction efficiency to be improved, and the wall of the microcapsule does not break before full dispersion of the microcapsule, so local auto-agglutination of the graft monomer is not initiated, side reactions are reduced, and the quality of a reaction product is improved.

Description

technical field [0001] The invention belongs to the field of polyolefin solid-phase grafting modification, in particular to a polyolefin grafting method using peroxide as an initiator. Background technique [0002] Polyolefin grafting is an important modification technique. Common polyolefins include polyethylene and polypropylene. Polar groups are introduced into the molecule through grafting to improve mechanical properties, thermal properties, dispersion properties and surface properties. Grafting monomers generally include maleic anhydride and its derivatives, acrylic acid and its derivatives, styrene and vinyl acetate, etc. The methods of graft modification mainly include solvent method, melting method and solid phase method. The solvent method has a high grafting rate, but the post-processing is complicated and the environmental pollution is serious. The melting process is simple, but the reaction temperature is high, the polymer degradation is serious, and the prod...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02C08F4/34
Inventor 赵起超
Owner CHINA PETROLEUM & CHEM CORP
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