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Polypropylene with low gel content and high melt strength, preparation method and application thereof

A technology of high melt strength and polypropylene, applied in the field of polymer materials, can solve the problems of uneven concentration distribution, easy gelation, and affecting the performance of polypropylene, so as to improve quality stability, strong selectivity, and avoid partial The effect of the gel

Pending Publication Date: 2022-01-28
中化石化销售有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, because the concentration distribution of the cross-linking agent in polypropylene is not uniform, gels are prone to occur during the cross-linking process, which affects the properties of polypropylene.

Method used

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  • Polypropylene with low gel content and high melt strength, preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] Example 1 Crosslinked polypropylene was prepared by the following method.

[0036] In parts by weight, 100 parts of polypropylene raw material, 0.5 part of benzoyl peroxide, 0.1 part of allyl alcohol and 0.5 part of antioxidant (antioxidant 1010 and 168 are mixed in a mass ratio of 2:1), set The extrusion temperature of the fixed screw is 180° C., the rotational speed of the screw is 300 rpm, and the grafted polypropylene is formed through twin-screw melt extrusion reaction.

[0037]In parts by weight, mix 100 parts of grafted polypropylene, 0.1 part of ethylene glycol diglycidyl ether and 0.1 part of antioxidant (mixture of antioxidant 1010 and 168 in a mass ratio of 2:1), set the screw extrusion The outlet temperature is 200° C., the screw speed is 500 rpm, and the cross-linked polypropylene is formed through twin-screw melt extrusion reaction.

Embodiment 2

[0039] Example 2 Crosslinked polypropylene was prepared by the following method.

[0040] In parts by weight, mix 100 parts of polypropylene raw material, 0.01 part of lauroyl peroxide, 0.5 part of allyl alcohol and 0.1 part of antioxidant (mixture of antioxidant 1010 and 168 in a mass ratio of 2:1), set The screw extrusion temperature is 180° C., the screw speed is 300 rpm, and the grafted polypropylene is formed through twin-screw melt extrusion reaction.

[0041] In parts by weight, mix 100 parts of grafted polypropylene, 2 parts of polybutylene oxide and 0.5 parts of antioxidant (mixture of antioxidants 1010 and 168 in a mass ratio of 2:1), set the screw to extrude The temperature is 200° C., the screw speed is 500 rpm, and the cross-linked polypropylene is formed through twin-screw melt extrusion reaction.

Embodiment 3

[0043] Example 3 Crosslinked polypropylene was prepared by the following method.

[0044] In parts by weight, 100 parts of polypropylene raw materials, 0.2 parts of tert-butyl peroxide 2-ethylhexanoate, 2 parts of 2-hexen-1-ol and 0.35 parts of antioxidant (antioxidants 1010 and 168 or more 2:1 mass ratio mixture) mixed, set the screw extrusion temperature at 180°C, and the screw speed at 300rpm, and reacted through twin-screw melt extrusion to form grafted polypropylene.

[0045] In parts by weight, 100 parts of grafted polypropylene, 1 part of 1,4 butanediol diglycidyl ether and 0.3 parts of antioxidant (mixture of antioxidants 1010 and 168 in a mass ratio of 2:1) were mixed to set The extrusion temperature of the fixed screw is 200° C., the rotational speed of the screw is 500 rpm, and the cross-linked polypropylene is formed through twin-screw melt extrusion reaction.

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Abstract

The invention relates to the technical field of high polymer materials, and discloses polypropylene with low gel content and high melt strength, a preparation method and application thereof. According to the method, a polypropylene raw material is grafted through unsaturated alcohol to obtain grafted polypropylene, and the grafted polypropylene is cross-linked through a multi-epoxy compound to obtain cross-linked polypropylene, namely the polypropylene with low gel content and high melt strength; According to the invention, unsaturated alcohol is used for grafting a polypropylene raw material, and is only grafted with polypropylene and cannot be cross-linked, and then a multi-epoxy compound reacts with the grafted alcohol to generate an ether bond, and does not directly react with the polypropylene, so that the generation of gel is effectively avoided; and the obtained polypropylene is low in gel content and high in melt strength, and can be used in foaming materials.

Description

technical field [0001] The invention relates to the technical field of polymer materials, in particular to a polypropylene with low gel content and high melt strength, a preparation method and application thereof. Background technique [0002] In recent years, the application of polypropylene in the field of foaming materials has gradually attracted attention. Compared with traditional polyurethane and polystyrene foaming materials, polypropylene foaming materials have high strength, high heat distortion temperature, low dielectric constant, and are easy to recycle. With a series of advantages, it is widely used in various fields such as packaging materials, communication base station shells, automotive interior and exterior decorations, and equipment transfer boxes. However, the melt strength of polypropylene itself is low, the molecular weight is small, and the crystallization characteristics lead to more exothermic curing and longer curing time, so it is very technically ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J3/24C08L51/06C08K5/1515C08K5/134C08K5/526C08F255/02C08F216/08C08F216/04
CPCC08J3/24C08F255/02C08J2351/06C08K5/1515C08K5/1345C08K5/526C08F216/08C08F216/04
Inventor 王武聪金华杜中杰冯坤豪缪徐然郑舒燕
Owner 中化石化销售有限公司
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