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Method for grafting polar monomer onto polypropylene through aqueous suspension solid-phase graft

A water-phase suspension and solid-phase grafting technology, which is applied in the field of graft modification of polypropylene, can solve the problems of poor aging resistance, poor transparency, and low strength, achieve good heat transfer and uniformity, and improve application Foreground, overcoming the effect of material bonding

Inactive Publication Date: 2013-02-06
三亚哈尔滨工程大学南海创新发展基地
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, PP also has many shortcomings, such as poor toughness, low strength, poor aging resistance, poor transparency, flammability, large molding shrinkage, and easy warping of products, etc. These defects limit the use of PP in automobiles, home appliances, Applications in industries such as medicine, so it must be modified

Method used

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  • Method for grafting polar monomer onto polypropylene through aqueous suspension solid-phase graft
  • Method for grafting polar monomer onto polypropylene through aqueous suspension solid-phase graft

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] The polar grafting monomer 2-acrylamidoacetic acid of 25 parts by weight is dissolved in 300 parts of water, 25 parts of vinyl acetate, 2 parts of initiator dibenzoyl peroxide are dissolved in 12 parts of interface agent xylene, Then mix with 100 parts of polypropylene particles, swell at 60±2°C for 1.5h in a nitrogen atmosphere, then react at 95±2°C for 2h, then cool, wash, filter, and dry to obtain the final grafted product , the grafting rate is 6.8%.

[0022] The present invention uses the acid-base titration method to test the grafting rate of the grafted product. The specific method is as follows: firstly, the grafted product is extracted with acetone and methanol for 24 hours to remove residual vinyl acetate and polar monomer homopolymerization. things. Accurately weigh a certain amount (m) of the grafted product, dissolve it in an appropriate amount of xylene, and add an excess concentration of C 1 KOH-ethanol standard solution V 1 mL, reflux at 110°C for 1 ...

Embodiment 2

[0027] The polar graft monomer 2-acrylamidoacetic acid of 17 parts by weight is dissolved in 300 parts of water, 17 parts of vinyl acetate, 2 parts of initiator dibenzoyl peroxide are dissolved in 12 parts of interface agent xylene, and then Mix with 100 parts of polypropylene particles, swell at 60±2°C for 1.5h in a nitrogen atmosphere, then react at 95±2°C for 2h, then cool, wash, filter, and dry to obtain the final grafted product. Its graft rate is 4.2%.

Embodiment 3

[0029] The polar graft monomer 2-acrylamidoacetic acid of 15 parts by weight is dissolved in 300 parts of water, 5 parts of vinyl acetate, 2 parts of initiator dibenzoyl peroxide are dissolved in 12 parts of interface agent xylene, and then Mix with 100 parts of polypropylene particles, swell at 60±2°C for 1.5h in a nitrogen atmosphere, then react at 95±2°C for 2h, then cool, wash, filter, and dry to obtain the final grafted product. Its graft rate is 2.7%.

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Abstract

The invention provides a method for grafting a polar monomer onto polypropylene through aqueous suspension solid-phase graft. The method comprises the following steps : (1) acryloyl chloride reacts with amino acid under the alkali condition to obtain the polar grafting monomer; (2) the polar grafting monomer is dissolved into water, an auxiliary grafting monomer and benzoyl peroxide are dissolved into xylene, the polar grafting monomer solution and the auxiliary grafting monomer solution are mixed to obtain a mixed solution at a weight ratio of the polar grafting monomer to the auxiliary grafting monomer being (1:9)-(9:1), the mixed solution and polypropylene granules are mixed and stirred for 1.5h at 60 DEG C under the protection of nitrogen to obtain a mixture, then the mixture is heated to 80-95 DEG C for reaction for 2-6 hours, cooled, filtered, and dried to obtain the final graft product. Aiming at the defects of the solid-phase grafting techniques in the prior art, the method provided by the invention has the advantages that the polar monomer is used as the grafting monomer and vinyl acetate is used as the auxiliary grafting monomer, and the aqueous suspension solid-phase graft is adopted to prepare the polypropylene graft copolymer with a high grafting ratio, so that the application prospect of polypropylene in the field of biomedicine can be extended.

Description

technical field [0001] The invention relates to a method for modifying polyolefin materials. Specifically, it is a method for grafting and modifying polypropylene. Background technique [0002] Polypropylene (PP) is an important member of polyolefins (PE, PP, PB, etc.), and an important variety among the five general-purpose synthetic resins (PE, PP, PS, PVC, ABS). Because PP has excellent comprehensive performance and relatively low price, and is easy to modify at the same time, new PP materials emerge in an endless stream, and their usage in automobiles, home appliances, tool equipment, electronics, construction, computers and other industries is expanding day by day. [0003] Polypropylene has excellent physical and mechanical properties and excellent processability, which is the reason for its rapid development. However, PP also has many shortcomings, such as poor toughness, low strength, poor aging resistance, poor transparency, flammability, large molding shrinkage, ...

Claims

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Application Information

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IPC IPC(8): C08F255/02C08F220/58C08F218/08C08F2/18
Inventor 徐晓冬邱蕾蕾常秀娟周建张立芬朱元棋
Owner 三亚哈尔滨工程大学南海创新发展基地