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A high-melt strength impact-resistant polypropylene foam board and its preparation method

A high melt strength, foamed sheet technology, applied in the field of polymer materials, can solve the problems of poor molding ability, cell merger and rupture, low melt strength, etc., and achieve low foaming ratio and dense and uniform cells , the effect of high closed cell rate

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 of traditional general-purpose impact polypropylene, when it is used in the preparation of foamed sheets, there are problems such as cell merger and rupture, poor molding ability, etc.
[0004] 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 foam sheets are still limited

Method used

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  • A high-melt strength impact-resistant polypropylene foam board and its preparation method
  • A high-melt strength impact-resistant polypropylene foam board and its preparation method
  • A high-melt strength impact-resistant polypropylene foam board and its preparation method

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Experimental program
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preparation example Construction

[0101] Preparation of polypropylene base resin HMSPP801:

[0102] 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.

[0103] (1) Prepolymerization reaction

[0104] 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 prepol...

Embodiment 1-12

[0120] Preparation of polypropylene base resin

[0121] 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.

[0122] Foaming and rolling process

[0123] Add the above-mentioned base resin, foaming agent, cell control agent and processing aid according to the formula shown in Table 3 into a high-speed mixer and mix at high speed for 1 minute to obtain a premixed polypropylene foam board. Wherein, cell control agent selects talc for use; Antioxidant adopts calcium stearate: antioxidant 1010 (BASF): antioxidant 168 (BASF)=1: 2: 2 (weight ratio) compound mixture ; The lubricant uses MB50-002 (high molecular weight polysiloxane).

[0124] Adjust the temperature of the extruder to the foaming temperature shown in Table 3, then put the premix into the middle layer twin-screw of the extruder, control the torque at...

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Abstract

The invention provides a polypropylene foam plate and a method for preparing the same. Impact polypropylene with high melt strength is used as basic resin for the polypropylene foam plate and is foamed and rolled to obtain the polypropylene foam plate. The impact polypropylene with the high melt strength comprises random copolymerization polypropylene continuous phases and propylene-ethylene copolymer rubber dispersion phases, the content of room-temperature dimethylbenzene soluble matters in the impact polypropylene is higher than or equal to 10% and is lower than or equal to 35% by weight, a proportion of the Mw (molecular weight) of room-temperature trichlorobenzene soluble matters in the impact polypropylene to the Mw of room-temperature trichlorobenzene insoluble matters in the impact polypropylene is higher than 0.4 and is lower than or equal to 1. The polypropylene foam plate and the method have the advantages that the polypropylene foam plate has smooth surfaces and bubbles, is uniform in pore diameter distribution, good in high-temperature and low-temperature impact resistance and high in melt strength and can be widely applied to the fields of automobile components, food and electronic packaging, building decoration and the like; the method is simple and is easy to implement and low in cost, and the like.

Description

technical field [0001] The invention relates to the field of polymer materials, in particular to a high-melt strength impact-resistant polypropylene foam board and a preparation method thereof. Background technique [0002] Foamed sheets are widely used in containers, construction materials, auto parts, and impact energy absorbing materials, among others. Compared with polystyrene foamed sheets, polypropylene (PP) foamed sheets have excellent rigidity and thermal stability, and the demand for them has been increasing in recent years. The extrusion foaming sheet molding method of polypropylene has also received extensive attention. Polypropylene foam sheets and plates are mainly obtained by extrusion foaming method, specifically, the mixing and melting of each foaming component is directly completed in the extruder, and the foaming process is completed by decomposing and overflowing the foaming agent at the head of the machine. . The direct extrusion foaming method is to d...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F210/16C08F210/06C08F4/646C08L23/16C08L23/14C08L83/04C08K13/02C08K3/34C08K5/098C08K5/134C08K5/526C08J9/10
Inventor 郭鹏吕明福张师军徐耀辉毕福勇杨庆泉张丽英高达利初立秋
Owner CHINA PETROLEUM & CHEM CORP
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