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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, can solve the problems of cell distribution, uneven pore size, poor mechanical properties, and limitations, etc. Achieve good concavity and bubble shape, and shorten the molding cycle

Active Publication Date: 2018-10-16
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

[0100] Preparation of polypropylene base resin HMSPP601:

[0101] 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.

[0102] (1) Prepolymerization reaction

[0103] The main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), the cocatalyst (triethylaluminum), the first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 ℃, 20min after pre-contact, continuously into the continuous stirred tank prepolymerization reactor for prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of dicyclopentyl-dimethoxysilane is 0.3g / hr, the flow rate of the main catalyst is 0.6g / hr, and the ratio of TEA / DCPMS is 50 (mol / mol). The pr...

Embodiment 1-8

[0117] Preparation of polypropylene base resin

[0118] The high melt strength impact polypropylenes HMSPP601, HMSPP602 and HMSPP603 used as base resins were respectively prepared according to the above preparation methods of HMSPP601, HMSPP602 and HMSPP603.

[0119] Injection Foaming Process

[0120] A certain weight portion of talcum powder and the granulated base resin for injection foaming and cell nucleating agent composition prepared above are added to the barrel of the injection foaming equipment, and carbon dioxide or nitrogen is injected as a foaming agent. 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.

[0121] 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 raw materials injection); core retreat speed: 8mm / sec; delay time:...

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Abstract

The invention provides a composition used for preparing a polypropylene foaming material. The composition comprises high melt-strength anti-punching polypropylene as a base resin, the high melt-strength anti-punching polypropylene comprises a propylene homopolymer ingredient and a propylene-ethylene copolymer ingredient, and is characterized in that the molecular weight distribution Mw / Mn is less or equal to 10, and is greater or equal to 4; Mz+1 / Mw is greater than 10 and less than 20; the content of a room-temperature xylene soluble substance is greater than 10 wt% and less than 30 wt%; and the ratio of a room-temperature trichloro-benzenes soluble substance Mw to a room-temperature trichloro-benzenes insoluble substance is greater than 0.4 and less than 1. The invention also provides a polypropylene injection foaming formed body produced by the composition through injection foaming and a preparation method thereof, and the formed body is suitable for the fields with special requirements on the part shapes such as automobile, aircraft, and high-speed rail internal and external decoration.

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): C08L23/12C08L23/16C08K3/34C08F110/06C08F210/16C08J9/30B29C45/76
CPCB29C45/76C08F110/06C08F210/16C08J9/30C08J2203/06C08L23/12C08L2203/14C08L2205/025C08L2205/03C08L23/16C08K3/34C08F2500/11
Inventor 郭鹏吕明福张师军徐耀辉权慧徐毅辉董穆刘建叶解娜毕福勇
Owner CHINA PETROLEUM & CHEM CORP
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