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A kind of preparation method of polypropylene expanded beads

A technology of foaming beads and polypropylene, which is applied in the field of polymers, can solve problems such as application limitations, and achieve the effects of low cost, uniform cell diameter, and dense cells

Active Publication Date: 2017-04-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Because chlorofluorocarbons have a strong destructive effect on the ozone layer, the flammable and explosive properties of butane and pentane require special anti-explosion treatment during processing, so the application of this type of physical blowing agent is limited

Method used

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  • A kind of preparation method of polypropylene expanded beads
  • A kind of preparation method of polypropylene expanded beads
  • A kind of preparation method of polypropylene expanded beads

Examples

Experimental program
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Effect test

preparation example Construction

[0041] Preparation of matrix resin HMSPP501

[0042] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0043] Pre-polymerization reaction: the main catalyst (DQ-III catalyst, provided by Beijing Aoda Branch of Sinopec Catalyst Company) with a flow rate of about 0.5g / hr, the co-catalyst (triethylaluminum) with a flow rate of 6.33g / hr, and a flow rate of 0.63 g / hr of the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) was pre-contacted at 6°C for 20 minutes, and then continuously added to the continuous stirred tank prepolymerization reactor for prepolymerization reaction. Prepolymerization It is carried out under the environment of the propylene liquid phase body, the temperature is 15°C, and the residence time is about 4 minutes. Under these conditions, the prepolymerization ratio of the catalyst is about 120 to 150 times. The mol...

Embodiment 1～11

[0054]First, put 100 parts by weight of the matrix resin, the cell nucleating agent (silicon dioxide) and additives in the parts by weight shown in Table 2 into a high-speed mixer and mix at high speed for 30 seconds, then add the LabLine100 microparticle preparation system, The torque is controlled at about 65%, the speed is 300rpm, and the polypropylene resin particles are obtained by underwater pelletizing. Wherein, the matrix resin used in Examples 1-8 is HMSPP501, and the matrix resin used in Examples 9-11 is HMSPP502. The additives used in Examples 1-11 all include 0.2 parts by weight of antioxidant 1010 (BASF company), 0.1 part by weight of antioxidant 168 (by BASF company) and 0.05 parts by weight of calcium stearate. Specifically, after blending the matrix resin, cell nucleating agent, and additives with a high-speed mixer, extrude through a twin-screw extruder, and introduce a temperature of 75°C or below, preferably 70°C or below, more preferably 55°C Carry out mic...

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Abstract

The invention provides a preparation method of polypropylene foaming beads. High-melt strength homo-polypropylene as base resin and a supercutical fluid as a foaming agent undergo foaming so that the polypropylene foaming beads are prepared. The preparation method comprises that two or more stages of propylene homopolymerization reactions occur in two or more reactors connected in series, wherein external electron donors used in the two or more stages of reactions respectively comprise silane and diether compounds. The preparation method utilizes the wide-molecular weight distribution high-melt strength polypropylene as a raw material, realizes polypropylene raw material stabilization, effectively enlarges a foaming window, has easily adjustable processes and a low cost, can prepare the polypropylene foaming beads having uniform foam pore diameters, compact foam pores, uniform pore diameter distribution, a closed pore structure and density of 0.017-0.036g / cm<3> and can be widely used in occasions of automobile parts, foods, electronic packaging and building decoration having high flame-retardation requirements on plastic products.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a method for preparing polypropylene foam beads. Background technique [0002] Flexible and rigid foams such as polyurethane, polystyrene and polyethylene are the main traditional polymer foams. In recent years, polypropylene foam material has become the fastest growing environment-friendly anti-pressure buffer heat insulation material due to its unique and superior performance. Compared with traditional foaming materials, non-crosslinked polypropylene foaming materials have excellent mechanical properties and environmental protection properties. Specifically, it has excellent heat resistance, and the service temperature can reach 130°C; the dimension of the product is stable at high temperature, and the Vicat softening point can reach 160°C; good mechanical properties, high flexural modulus, good impact resistance; environmentally friendly Excellent performance, no harmful gas re...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L23/12C08F110/06C08F4/649C08F4/646C08J9/12C08K3/38C08K3/36C08K3/26C08K3/22
CPCC08F4/6465C08F4/6494C08F110/06C08J9/122C08J2203/08C08J2323/12C08L23/12
Inventor 郭鹏吕明福张师军毕福勇邹浩张丽英高达利权慧
Owner CHINA PETROLEUM & CHEM CORP
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