High-melt-strength anti-impact polypropylene foamed board and preparation and application thereof

A technology of high melt strength and foaming materials, applied in the field of foaming materials, can solve the problems of difficulty in material melting and extrusion, difficult to uniform and fine cells, and reduced melt strength, etc., and achieves controllable foaming ratio and surface The effect of good smoothness and high foaming ratio

Active Publication Date: 2017-01-04
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As the processing temperature rises, the melt strength of general-purpose impact resin drops sharply, and the gas decomposed by the foaming agent is difficult to keep in the resin, which may easily cause cell wall rupture, gas escape, cell collapse, and air bubbles during the foaming process. Merging and other phenomena, due to the release of more heat during crystallization, the melt strength is reduced, and the bubbles are easily destroyed after foaming, so it is not easy to obtain products with uniform and fine cells and high foaming ratio
[0006] The common way to increase the melt strength of polypropylene is to reduce the melt index, that is, to increase the molecular weight of polypropylene, but this will cause difficulties in material melting and extrusion

Method used

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  • High-melt-strength anti-impact polypropylene foamed board and preparation and application thereof
  • High-melt-strength anti-impact polypropylene foamed board and preparation and application thereof
  • High-melt-strength anti-impact polypropylene foamed board and preparation and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0105] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0106] The propylene polymerization reaction is carried out on a polypropylene unit, and the main equipment of the unit includes a prepolymerization reactor, a first loop reactor, a second loop reactor and a third gas phase reactor. The polymerization method and steps are as follows.

[0107] (1) Prepolymerization reaction

[0108] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), and the first external electron donor (diisopropyldimethoxysilane, DIPMS) were tested at 6 °C , After 20min pre-contact, continuously add to the continuous stirred tank type pre-polymerization reactor for pre-polymerization reactor. The flow of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow of diisopropyldimethoxysilane is 0.3g / hr, the flow of main ...

preparation example 2

[0116] This preparation example is used to illustrate the polypropylene provided by the present invention and its preparation method.

[0117] The catalyst used, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Preparation Example 1. The difference from Preparation Example 1 is that the amount of comonomer ethylene added in the first stage and the second stage in the first step is changed to 30000ppm. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

preparation example 3

[0119] The catalyst used in Preparation Example 3, pre-complexation, polymerization process conditions and auxiliary agent formulation and addition are the same as in Example 1. The difference from Example 1 is that the comonomer ethylene in the first stage and the second stage in the first step is changed to 1-butene, and the addition amount of the first and second ring pipes is 10 mol%. The obtained polymer analysis results and polymer physical properties are listed in Table 1 and Table 2.

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Abstract

The invention relates to a high-melt-strength anti-impact polypropylene foamed board. The foamed board is prepared through foaming with high-melt-strength anti-impact polypropylene as matrix resin. The high-melt-strength anti-impact polypropylene comprises a random copolymerization polypropylene continuous phase and a rubber dispersed phase of propylene-ethylene copolymer, wherein the content of room temperature dimethylbenzene soluble substances of the high-melt-strength anti-impact polypropylene is larger than 10 wt% and smaller than 35 wt%, and the ratio of Mw of room temperature trichlorobenzene soluble components to Mw of room temperature trichlorobenzene insoluble components is larger than 0.4 and smaller than 1. The invention further relates to a preparation method of the foamed material. The foamed material has higher melt strength, so foamed products with higher foaming ratio and better surface smoothness can be obtained, and the foamed material also has the characteristics of being high in rigidity, high in toughness and the like. Meanwhile, the foamed board has the advantages of being good in high-and-low-temperature anti-impact performance, high in physical heat resistance, high in percentage of close area, good in heat insulation and sound isolation performance, controllable in foaming ratio and foam pore structure and the like.

Description

technical field [0001] The invention relates to the field of foaming materials, in particular to a high-melt strength impact-resistant polypropylene foaming material and a preparation method thereof. Background technique [0002] The preparation method of polypropylene foam material is mainly based on the supersaturated gas method. First, the blowing agent is dissolved and diffused in the polymer to form a gas / polymer saturated system; then the system enters a supersaturated state through a sudden temperature rise and / or rapid pressure release, thereby inducing cell nucleation and growth; Finally, the cell structure is finalized by rapid cooling and other methods. [0003] Polypropylene foam material has excellent heat resistance, insulation, heat preservation, cold resistance, oil resistance, chemical resistance, barrier properties and easy recycling. Therefore, compared with the common expanded polystyrene (EPS or XPS) or expanded polyurethane (EPU) on the market, the po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08L23/16C08L23/14C08F210/16C08F210/06C08F210/08C08J9/12
CPCC08F210/06C08F210/16C08J9/122C08J2203/06C08J2203/08C08J2203/182C08J2323/14C08J2423/14C08J2423/16C08L23/14C08L2201/08C08L2203/14C08L2205/025C08L2205/03C08L23/16C08F210/02C08F210/08
Inventor 徐耀辉毕福勇郭鹏吕明福张师军吕芸邵静波邹浩杨庆泉白弈青
Owner CHINA PETROLEUM & CHEM CORP
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