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High-melt-strength polypropylene as well as preparation method and application thereof

A technology of polypropylene and grafted polypropylene, applied in the field of polypropylene, can solve problems such as poor compatibility and decreased mechanical properties of polypropylene, and achieve the effects of low reaction temperature, avoiding degradation and short reaction time

Active Publication Date: 2020-12-15
INST OF CHEM CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the addition of blends to polypropylene usually results in a decrease in the mechanical properties of polypropylene due to poor compatibility between polypropylene and blends

Method used

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  • High-melt-strength polypropylene as well as preparation method and application thereof
  • High-melt-strength polypropylene as well as preparation method and application thereof
  • High-melt-strength polypropylene as well as preparation method and application thereof

Examples

Experimental program
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Effect test

preparation example Construction

[0037]The preparation method of the present invention will be further described in detail in conjunction with specific examples below. It should be understood that the following examples are only for illustrating and explaining the present invention, and should not be construed as limiting the protection scope of the present invention. All technologies realized based on the above contents of the present invention are covered within the scope of protection intended by the present invention.

[0038] The experimental methods used in the following examples are conventional methods unless otherwise specified; the reagents and materials used in the following examples can be obtained from commercial sources unless otherwise specified.

[0039] The polypropylene (PP) raw material (ungrafted polypropylene) used in the following examples is homopolypropylene powder, the average particle size is <0.06mm, and the melt index is 9g / 10min.

[0040] The brand name of commercially available ...

preparation example 1

[0049] Weigh 100g of polypropylene powder and place it in a closed reaction kettle, vacuumize and fill with nitrogen three times to ensure that the reaction is carried out under a nitrogen atmosphere, and dissolve 0.5g of graft monomer maleic anhydride and 0.5g of initiator TBPB in 20mL of xylene , added to the reactor, stirring and swelling at room temperature for about 0.5h. After heating up to 120° C. for 3 hours to obtain PP grafted maleic anhydride, the product was purified by Soxhlet extraction with acetone for 6 hours to obtain purified maleic anhydride grafted polypropylene. It is measured that the corresponding graft ratio is 0.005, and the melt index is 9.5g / 10min.

preparation example 2

[0051] Adopt the preparation method of above-mentioned preparation example 1, difference is, by adjusting monomer maleic anhydride addition amount, the addition amount of initiator and reaction temperature, prepare the maleic anhydride grafted polypropylene of different graft ratio and melt index . The experimental conditions and test results of Preparation Example 1-7 are shown in Table 1

[0052]

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Abstract

The invention provides high-melt-strength polypropylene as well as a preparation method and application thereof. According to the invention, special short branched chain maleic anhydride introduced into a polypropylene molecular chain is used as an active group, an anhydride group on a short branched chain reacts with an alcoholic hydroxyl group in a polyol molecule, and polyol is grafted to forma three-dimensional network structure, so that the polypropylene with high melt strength is prepared. The polypropylene also has excellent mechanical properties such as tensile strength, bending strength and the like. According to the invention, maleic anhydride grafted polypropylene is innovatively used as a matrix, short-chain branch maleic anhydride in a molecular chain is used as an active group, maleic anhydride reacts with alcoholic hydroxyl groups in polyol molecules, and high-melt-strength polypropylene is prepared by changing the structure of linear polypropylene; the method is carried out under mild conditions, the reaction temperature is low, the reaction time is short, and the degradation of the polypropylene molecular weight caused by high temperature is avoided, thereby avoiding influencing the mechanical properties of the product.

Description

technical field [0001] The invention relates to the technical field of polypropylene, in particular to a high-melt-strength polypropylene and its preparation method and application. Background technique [0002] Polypropylene is currently one of the most widely used and fastest-growing thermoplastic resins. Because of its low density, high melting point, heat resistance and corrosion resistance, it is widely used in packaging, light industry, construction, electronics, electrical appliances and automobiles, etc. industry. In general industrially produced polypropylene resins, the content of isotactic polypropylene is about 95%. However, isotactic polypropylene has a linear structure and a relatively narrow molecular weight distribution, resulting in low melt strength and poor sag resistance, which limits its application in the fields of foaming and thermoforming. During thermoforming production processes such as injection, extrusion, and calendering, the edge of the produc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L51/06C08L71/02C08K5/134C08K5/053
CPCC08L51/06C08K5/053C08L2203/14C08L71/02C08K5/1345
Inventor 李化毅王丽李倩刘腾飞胡友良
Owner INST OF CHEM CHINESE ACAD OF SCI
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