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Composition for preparing polypropylene foam material and foamed molded body thereof

A technology of foaming material and polypropylene, which is applied in the field of high melt strength impact polypropylene injection foam molding and its preparation, which can solve the problems of low melt strength, poor mechanical properties, cell distribution, uneven pore size, etc. question

Active Publication Date: 2018-08-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the low melt strength and poor impact resistance of traditional general-purpose polypropylene, when used for injection foaming material preparation and post-processing molding, there are cell distribution, uneven pore size, and poor mechanical properties. question
[0007] The homopolypropylene or random copolymerized polypropylene prepared in the prior art often cannot have both high melt strength and impact resistance, and also lacks properties such as rigidity and toughness. Therefore, the polypropylene material prepared based on this The performance and application of polypropylene injection foam materials are still limited

Method used

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  • Composition for preparing polypropylene foam material and foamed molded body thereof
  • Composition for preparing polypropylene foam material and foamed molded body thereof
  • Composition for preparing polypropylene foam material and foamed molded body thereof

Examples

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preparation example Construction

[0107] Preparation of polypropylene base resin HMSPP801:

[0108] 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.

[0109] (1) Prepolymerization reaction

[0110] 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 catalyst is 0.6g / hr, and the ratio of TEA / DIPMS is 50 (mol / mol). The pre-po...

Embodiment 1-10

[0126] Preparation of polypropylene base resin

[0127] The high melt strength impact polypropylenes HMSPP801, HMSPP802, HMSPP803 and HMSPP804 used as base resins were respectively prepared according to the above preparation methods of HMSPP801, HMSPP802, HMSPP803 and HMSPP804.

[0128] Injection Foaming Process

[0129] A certain weight portion of talcum powder and the base resin for injection foaming and cell nucleating agent composition prepared above after granulation are added to the cylinder of the injection foaming equipment, and carbon dioxide or nitrogen is injected as a foaming agent at the same time. Subsequently, injection molding was carried out under the following conditions to obtain a foamed molded article. The specific material ratio and some foaming process parameters are shown in Table 3.

[0130] The injection molding process of other parts is as follows: injection time: about 1.5 seconds (from the start of injection to the end of all injection of raw mat...

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Abstract

The invention provides a composition for preparing a polypropylene foaming material. The composition comprises high melt strength impact polypropylene, and the high melt strength impact polypropylene comprises a random copolymerization polypropylene continuous phase and a propylene-ethylene copolymer rubber dispersion phase. The content of room temperature dimethylbenzene solvend is larger than or equal to 10 wt%, and smaller than or equal to 35 wt%. The ratio of room temperature Mw of trichlorobenzene solvend to Mw of room temperature trichlorobenzene insoluble is larger than 0.4 and smaller than or equal to 1. The invention further provides a polypropylene injection foaming forming body made of the composition by injection foaming and a preparation method thereof. The forming body is suitable for the fields having special requirements for shapes, such as automobile, aircraft and high-speed rail inside and outside decoration components and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a composition for preparing polypropylene foam material, a high-melt-strength impact-resistant polypropylene injection foam molded body prepared by the composition and a preparation method thereof. Background technique [0002] Polymer foam contains extremely small air cells and a thin air film covering the air cells. Due to the high volume ratio of gas, it has good heat insulation, cushioning, and floatability, and is cost-effective, so it can be used in a wide range of fields. In recent years, polypropylene resin foaming materials have been widely used in thermal insulation building materials, automotive components, packaging cushioning materials and other fields due to their good performance and cost balance, and can be recycled. [0003] The methods for preparing polypropylene foam mainly include bead method and extrusion method. The former uses foaming agents such as carbon...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/16C08L23/14C08F210/16C08F210/06C08J9/12
CPCC08F210/06C08F210/16C08J9/122C08J2203/06C08J2323/14C08J2423/14C08J2423/16C08L23/14C08L2203/14C08L2205/03C08L23/16C08F210/02C08F210/08
Inventor 郭鹏吕明福徐耀辉张师军董穆初立秋权慧解娜毕福勇
Owner CHINA PETROLEUM & CHEM CORP
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