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Porous polypropylene particle suspension solid phase graft-modification method

A technology of suspension grafting and solid-phase grafting is applied in the field of suspension and solid-phase grafting modification of porous polypropylene particles, which can solve the problem of low grafting depth, unsuitable monomers, reactants and The products are difficult to separate and other problems, to achieve the effect of simple process, no pollution, and improved mechanical properties

Active Publication Date: 2008-09-17
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0016] However, since this method uses pure water as the reaction medium, there are certain restrictions on grafted monomers, and it is not suitable for monomers with greater solubility in water.
And there are problems such as difficult separation of reactants and products and low grafting depth

Method used

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  • Porous polypropylene particle suspension solid phase graft-modification method
  • Porous polypropylene particle suspension solid phase graft-modification method
  • Porous polypropylene particle suspension solid phase graft-modification method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] Dissolve the initiator benzoyl peroxide in the acrylic acid monomer according to 0.5% of the mass of the monomer, and then soak the porous polypropylene (PP) particles with a porosity of 0.14-0.44 in the above-mentioned monomer / initiator solution for 30 Minutes, so that monomers and initiators are fully adsorbed into the pores of PP particles. Prepare sodium chloride brine with a concentration of 20%, put it in the reactor, turn on the stirring and heating device, and when the temperature reaches 85°C, put in PP particles soaked in monomer and initiator, react for 2 hours, and discharge , washed with distilled water and acetone to remove unreacted monomers and initiators, and then dried to obtain a graft-modified product.

Embodiment 2

[0032] Dissolve the initiator benzoyl peroxide in the methyl acrylate monomer according to 1% of the monomer mass, and then soak the porous polypropylene (PP) particles with a porosity of 0.14-0.44 in the above monomer / initiator solution For 20 minutes, the monomer and initiator are fully absorbed into the pores of PP particles. Prepare brine with a concentration of 35% sodium chloride, place it in the reactor, and turn on the stirring and heating device. When the temperature reaches 85°C, put PP particles soaked in monomers and initiators, react for 3 hours, discharge, wash with distilled water and acetone respectively, remove unreacted monomers and initiators, and then dry to obtain Graft modified products.

Embodiment 3

[0034] The initiator benzoyl peroxide is dissolved in acrylic acid and methyl acrylate monomer (mass ratio is 1:1) according to 1.5% of the monomer mass, and then the porous polypropylene (PP) particles with a porosity of 0.14-0.44 Soak in the above monomer / initiator solution for 30 minutes to fully absorb the monomer and initiator into the pores of PP particles. Prepare brine with a concentration of 25% sodium chloride, place it in the reactor, and turn on the stirring and heating device. When the temperature reaches 85°C, put PP particles soaked in monomers and initiators, react for 3 hours, discharge, wash with distilled water and acetone respectively, remove unreacted monomers and initiators, and then dry to obtain Graft modified products. The grafted product was injected into a specimen, and the notched impact strength (kJ / M 2 ) is 5.44, the tensile strength (Mpa) is 37.54, and the yield stress (Mpa) is 31.99.

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Abstract

The invention relates to a method for modifying grafting for porous polypropylene particle floating solid phase. The invention modifies floating solid phase grafting for polypropylene particle absorbed with monomer and initiator in salt solution, to increase grafting depth, reduce degradation and side reaction, and improve mechanics property for polypropylene. The modified product can also be used as compatible agent for PP and other polymer to increase material compatibility and then improve mechanics property.

Description

Technical field: [0001] The invention relates to a porous polypropylene particle suspension solid-phase graft modification method. Background technique: [0002] Among the five general-purpose plastics, polypropylene (PP) has a short development history, but it is the fastest growing one. Its output and production capacity are steadily increasing, with an annual growth rate of 8-12%. The United States, Western Europe and Japan The production capacity of other countries accounts for 2 / 3 of the world. However, the share of high value-added products is relatively small, which leads to their inability to meet the rapidly growing needs of the market, especially the plastic products industry. For this reason, the PP industry at home and abroad is actively adjusting the industrial structure, opening up new application fields, adding new high-performance varieties and grades, developing PP-based alloy materials, vigorously researching and developing PP modified products and technol...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F255/02
Inventor 杨万泰罗伟孙玉凤何辰凤
Owner BEIJING UNIV OF CHEM TECH