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Preparation method of grafted and modified polypropylene

A graft modification, polypropylene technology, applied in the field of polypropylene, can solve the problems of low graft rate of graft modified polypropylene, and achieve the effect of improving the graft rate

Active Publication Date: 2021-05-25
石家庄联合石化有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, one of the major difficulties currently faced by the above-mentioned graft modified polypropylene is that the grafted modified polypropylene prepared by conventional techniques or techniques has a very low graft rate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0022] The invention discloses a preparation method of graft modified polypropylene, comprising the following steps:

[0023] a) The polypropylene is subjected to plasma treatment, after vacuuming to 100Pa-200Pa, argon gas is introduced, and the gas flow rate is 20-40cm 3 / s, when the power is 20-100KW, the voltage is 380V, the processing time is 30-100s; then feed ammonia gas, the air flow is 20-40cm 3 / s, when the power is 20-100KW, the voltage is 380V, the processing time is 30-100s;

[0024] b) Soak the polypropylene treated in step a) in the grafted monomer solution, in a water bath for 5-10 hours, and the temperature of the water bath is 60-80°C;

[0025] c) Then carry out ultraviolet irradiation treatment, the irradiation wavelength is below 300nm, the power is 500W-2000W, and the treatment time is 10-20min;

[0026] d) The polypropylene treated in step c) is rinsed with deionized water for 3-5 times, and after removing impurities, it is dried under vacuum for 3-5 hou...

Embodiment 1

[0037] A preparation method of graft modified polypropylene, comprising the following steps:

[0038] a) The polypropylene is subjected to plasma treatment, after vacuuming to 100Pa, argon gas is introduced, and the gas flow rate is 20cm 3 / s, when the power is 20KW, the voltage is 380V, and the processing time is 30s; then the ammonia gas is introduced, and the air flow rate is 20cm 3 / s, at a power of 20KW, a voltage of 380V, and a processing time of 30s; the polypropylene is granular, with an average particle size of 200μm and a weight average molecular weight of 6×10 4 ;

[0039] b) Soak the polypropylene treated in step a) in the grafted monomer solution, take a water bath for 5 hours, and the temperature of the water bath is 80°C; the grafted monomer solution includes the following raw materials in parts by weight: 20 parts of acrylic acid, 0.5 parts Rosin soap, 0.1 part of azobisisobutyronitrile, 60 parts of toluene; the addition of the grafted monomer solution is 0.8...

Embodiment 2

[0043] A preparation method of graft modified polypropylene, comprising the following steps:

[0044] a) The polypropylene is subjected to plasma treatment, after vacuuming to 200Pa, argon gas is introduced, and the gas flow rate is 40cm 3 / s, when the power is 100KW, the voltage is 380V, and the processing time is 100s; then the ammonia gas is introduced, and the air flow is 40cm 3 / s, at a power of 100KW, a voltage of 380V, and a processing time of 100s; the polypropylene is granular, with an average particle size of 300μm and a weight average molecular weight of 2×10 5 ;

[0045]b) Soak the polypropylene treated in step a) in the grafted monomer solution, take a water bath for 10 hours, and the temperature of the water bath is 60°C; the grafted monomer solution includes the following raw materials in parts by weight: 15 parts of methyl methacrylate Ester, 15 parts of epoxy acrylate, 1 part of sodium petroleum sulfonate, 0.3 parts of benzoyl peroxide, 40 parts of ether, 40...

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Abstract

The invention discloses a preparation method of grafted and modified polypropylene. The preparation method comprises the following steps: carrying out plasma treatment on polypropylene, conducting vacuumizing, and respectively introducing argon and ammonia gas for treatment; soaking the treated polypropylene in a grafting monomer solution, and carrying out water-bath treatment for 5-10 hours at a water-bath temperature of 60-80 DEG C; then conducting ultraviolet radiation treatment, wherein a radiation wavelength is 300 nm or below, and treatment time is 10-20 min; and conducting washing with deionized water, removing impurities, and performing drying in vacuum for 3-5 hours to obtain the grafted and modified polypropylene. After the polypropylene is subjected to argon and ammonia plasma treatment, a large number of active groups including carboxyl, hydroxyl, carbonyl and amino groups can be generated on the surface of the polypropylene, so reaction active sites are provided for graft modification; the polypropylene having been subjected to plasma treatment is soaked in the grafting monomer solution, and a part of grafting monomers are enabled to undergo a reaction with the groups, so the grafting monomers are grafted on the polypropylene; and then through ultraviolet radiation, the grafting rate of the grafting monomer can be improved, and the problem of low grafting rate of a traditional method is solved.

Description

technical field [0001] The invention belongs to the field of polypropylene, in particular to a preparation method of graft modified polypropylene. Background technique [0002] Polypropylene (polypropylene) is one of the five general-purpose plastics. It has good physical and mechanical properties and excellent price, and has outstanding stress crack resistance, wear resistance and chemical stability. Because of its wide source of raw materials and low price, it has been widely used in the development of polyolefin for more than 40 years. However, polypropylene also has some outstanding shortcomings. Its mechanical properties are inferior to engineering plastics, so it cannot be used as an engineering structural material; and because of the non-polarity and crystallinity of polypropylene, it is difficult to alloy it with polar polymers. It is not easy to wet, bond, print, dye and coat, which limits its further application. Therefore, it is necessary to modify polypropylene...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F255/02C08F220/06C08F220/14C08F220/32C08F222/08C08F212/08C08F220/18C08F2/48
CPCC08F255/02C08F2/48C08F220/06C08F220/14C08F220/32C08F222/08C08F212/08C08F220/1802Y02P20/52
Inventor 乔亮梁信科张立云杨连宝于常艳
Owner 石家庄联合石化有限公司