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 problems such as poor surface smoothness, low melt strength, and uneven cells, and achieve a controllable and foaming ratio. The effect of low magnification and dense and uniform cells

Active Publication Date: 2019-04-19
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 its low melt strength, the traditional general-purpose impact polypropylene has problems such as poor surface flatness, uneven cells, and poor mechanical properties when used in the preparation and post-processing of foamed sheets.
[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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preparation example Construction

[0094] Preparation of polypropylene base resin HMSPP601:

[0095] The propylene polymerization is carried out on a polypropylene plant, the main equipment of which 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.

[0096] (1) Prepolymerization

[0097] Main catalyst (DQC-401 catalyst, provided by Sinopec Catalyst Company Beijing Aoda Branch), co-catalyst (triethylaluminum), first external electron donor (dicyclopentyl-dimethoxysilane, DCPMS) after 6 After precontacting at ℃ and 20min, it was continuously added to the continuous stirred tank type prepolymerization reactor to carry out the prepolymerization reactor. The flow rate of triethylaluminum (TEA) entering the prepolymerization reactor was 6.33 g / hr, the flow rate of dicyclopentyl-dimethoxysilane was 0.3 g / hr, the flow rate of the main catalyst was 0.6 g / hr, and the TEA / DCPMS ratio was is 50 (mol / mol). ...

Embodiment 1-12

[0111] Preparation of Polypropylene Base Resin

[0112] According to the above-mentioned preparation methods of HMSPP601, HMSPP602 and HMSPP603, high melt strength impact polypropylenes HMSPP601, HMSPP602 and HMSPP603 are respectively prepared as base resins.

[0113] Foaming and Rolling Process

[0114]The above-mentioned base resin, foaming agent, cell control agent and processing aid were added to a high-speed mixer according to the formula shown in Table 3 and mixed at a high speed for 1 minute to obtain a premix of polypropylene foamed sheet. Wherein, the cell control agent selects talcum powder; the antioxidant adopts the compound mixture of calcium stearate: antioxidant 1010 (BASF): antioxidant 168 (BASF)=1:2:2 (weight ratio) ; Lubricant using MB50-002 (high molecular weight polysiloxane).

[0115] 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...

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Abstract

The invention provides a high-melt-strength anti-impact polypropylene foamed board and a preparation method thereof. The foamed board is prepared with high-melt-strength anti-impact polypropylene serves as matrix resin through foaming and rolling. The high-melt-strength anti-impact polypropylene is composed of a propylene homopolymer component and a propylene-ethylene copolymer component and has the characteristics that molecular weight distribution Mw / Mn is smaller than or equal to 10 and larger than or equal to 4, Mz+1 / Mw is larger than 10 and smaller than 20, the room temperature dimethylbenzene soluble component content is larger than 10 wt% and smaller than 30 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 polypropylene foamed board has the advantages of being flat in surface, uniform in foam pore and aperture size distribution, good in high-and-low-temperature anti-impact performance, high in melt strength and the like, can be widely used in the fields of vehicle parts, food and electronic packaging, building decoration and the like, and is simple in preparation method, 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 foam sheet and a preparation method thereof. Background technique [0002] Foamed sheets are widely used in containers, building materials, automotive parts, and impact energy absorbing materials, among others. Compared with the polystyrene-based foamed sheet, the polypropylene (PP)-based foamed sheet has excellent rigidity and thermal stability, and the demand for it has been increasing in recent years. The extrusion foam sheet molding method of polypropylene has also received extensive attention. Polypropylene foamed sheets and plates are mainly obtained by extrusion foaming method. Specifically, the mixing and melting of the various components of foaming are directly completed in the extruder, and the foaming process is completed by the decomposition and overflow of the foaming agent at the head of the machine. . The direc...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08L23/16C08J9/10C08F110/06C08F210/16
CPCC08F210/16C08J9/103C08J9/104C08J9/107C08J2203/04C08J2203/20C08J2323/12C08J2423/08C08J2423/12C08L23/12C08L2201/06C08L2201/08C08L2203/14C08L2205/025C08L2205/03C08L2205/035C08L23/0815C08F210/06
Inventor 郭鹏吕明福张师军宋文波毕福勇徐耀辉杨庆泉李杰徐萌
Owner CHINA PETROLEUM & CHEM CORP
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