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High-melt-strength impact-resistant polypropylene foamed beads and preparation method thereof

A high-melt-strength, expanded bead technology, applied in the field of polymer materials, can solve problems such as rising energy costs, insufficient rigidity, toughness or impact resistance, and limitations

Active Publication Date: 2017-05-17
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Although the homopolypropylene or random copolymerized polypropylene prepared according to the method reported in the above patent literature has high melt strength, the rigidity, toughness or impact resistance are insufficient, so the polypropylene material prepared based on this polypropylene material The performance and application of propylene foamed beads are still limited
[0008] Moreover, when the polypropylene foam beads are in-molded, in order to make the foam beads melt and bond to each other while the foam beads are foamed twice, it is necessary to use steam heating with a relatively high saturated vapor pressure, so that It is necessary to use a high-pressure metal mold and a high-strength special forming machine, which will lead to an increase in energy costs

Method used

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  • High-melt-strength impact-resistant polypropylene foamed beads and preparation method thereof
  • High-melt-strength impact-resistant polypropylene foamed beads and preparation method thereof
  • High-melt-strength impact-resistant polypropylene foamed beads and preparation method thereof

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preparation example Construction

[0110] Preparation of polypropylene base resin HMSPP801:

[0111] The propylene polymerization reaction is carried out on a polypropylene device. The main equipment of the device 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.

[0112] (1) Pre-polymerization reaction

[0113] Main catalyst (DQC-401 catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company), co-catalyst (triethylaluminum), first external electron donor (diisopropyldimethoxysilane, DIPMS) at 6℃ , 20min after pre-contact, continuously add continuous stirred tank prepolymerization reactor to pre-polymerization reactor. The flow rate of triethyl aluminum (TEA) entering the prepolymerization reactor is 6.33g / hr, the flow rate of diisopropyldimethoxysilane is 0.3g / hr, the flow rate of the main catalyst is 0.6g / hr, and the TEA / DIPMS ratio is 50 (mol / mol). The prepolymerization is carried out in...

Embodiment 1-12

[0129] Preparation of polypropylene base resin

[0130] According to the above-mentioned preparation methods of HMSPP801, HMSPP802, HMSPP803 and HMSPP804, high melt strength impact polypropylene HMSPP801, HMSPP802, HMSPP803 and HMSPP804 as the base resin are respectively prepared.

[0131] Preparation of polypropylene base resin particles

[0132] According to the formula of Examples 1-12 shown in Table 3, put the high-melt strength impact polypropylene, cell nucleating agent and processing aid into a high-speed mixer and mix at high speed for 30 seconds, and then add Lab100 microparticles. System, the torque is controlled at about 65%, and the speed is 300rpm. The cell nucleating agent is silicon dioxide, and the amount is shown in Table 3. The processing aids include antioxidant 1010 (BASF company), antioxidant 168 (BASF company), etc., and the amount is conventional, that is, 0.2 and 0.1 parts by weight relative to 100 parts by weight of the polypropylene base resin.

[0133] Foa...

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Abstract

The invention provides high-melt-strength impact-resistant polypropylene foamed beads and a preparation method thereof. The foamed beads are prepared by dipping and foaming high-melting-strength impact-resistant polypropylene serving as base resin; the high-melting-strength impact-resistant polypropylene comprises an atactic copolymerization polypropylene continuous phase and a propylene-ethylene copolymer rubber dispersion phase; the room-temperature xylene dissolved substance content is more than or equal to 10 percent by weight and less than or equal to 35 percent by weight; the ratio of the Mw of room-temperature trichlorobenzene dissolved substance to the Mw of room-temperature trichlorobenzene undissolved substance is more than 0.4 and less than or equal to 1. The polypropylene foamed beads provided by the invention has the advantages of foam pore and pore diameter distribution uniformity, high closed pore rate, good high-temperature and low-temperature impact resistance, high melt strength and the like, and can be widely applied in the fields of automobile parts, food, electronic package, building decoration and the like; the preparation method is simple, easy to operate and low in cost.

Description

Technical field [0001] The invention relates to the field of polymer materials, in particular to a high-melt strength impact-resistant polypropylene foamed bead and a preparation method thereof. Background technique [0002] Due to its light weight, good mechanical properties, and the characteristics of products with specific shapes can be made by molding, polypropylene foamed beads have become a versatile polymer foam material, and its development and industrial production have always been the industries of various countries. The focus of attention of the world and academia. [0003] Compared with polystyrene series resin foamed beads molded products, polypropylene foamed molded products obtained by molding polypropylene foamed beads have good corrosion resistance, toughness, heat resistance and compression resilience And other excellent performance. However, polypropylene has poor low-temperature impact resistance, especially propylene homopolymer. After process adjustment, im...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08J9/18C08J9/12C08L23/14C08L23/08C08F210/06C08F210/16C08F210/08C08F4/646C08F4/649
Inventor 郭鹏吕明福张师军毕福勇徐耀辉徐萌徐凯尹华邹浩
Owner CHINA PETROLEUM & CHEM CORP
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