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Propylene-ethylene high-melt-strength polypropylene foamed bead and preparation method thereof

A high-melt-strength, foaming bead technology, applied in the polymer field, can solve the problems of high cost, non-recyclability, and natural degradation of polypropylene foam materials, and achieves low cost, uniform cell diameter, and cell dense effect

Active Publication Date: 2014-03-26
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But this method uses the high-energy electron beam cross-linking method to prepare foaming material, so this material can not be degraded naturally in the environment, can not be recycled when being used to make automotive interior materials such as car roof, door and instrument panel after the car is scrapped, will be harmful to environmental impact
U.S. Patent US6251319 (applied on April 30, 1999) discloses a method for preparing polypropylene foam sheet, using high melt strength polypropylene resin and volatile and flammable blowing agent butane, and the expansion ratio is 4-56 times, but due to the use of combustibles as foaming agents, equipment and corresponding workshops must undergo special explosion-proof treatment, so the cost of producing polypropylene foaming materials is relatively high

Method used

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  • Propylene-ethylene high-melt-strength polypropylene foamed bead and preparation method thereof
  • Propylene-ethylene high-melt-strength polypropylene foamed bead and preparation method thereof
  • Propylene-ethylene high-melt-strength polypropylene foamed bead and preparation method thereof

Examples

Experimental program
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preparation example Construction

[0042] Preparation of matrix resin HMSPP201

[0043] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0044] Pre-polymerization reaction: the main catalyst (titanium-containing solid catalyst active component) is obtained by the method described in Example 1 of Chinese patent CN93102795, the Ti content is 2.4wt%, the Mg content is 18.0wt%, and the di-n-phthalic acid The butyl ester content is 13 wt%. The main catalyst, co-catalyst (triethylaluminum), and the first external electron donor (dicyclopentyldimethoxysilane, DCPMS) are pre-contacted at 10°C for 20 minutes, and then continuously added to the pre-polymerization reactor for pre-polymerization. In the polymerization reactor, the pre-polymerization is carried out in the environment of the propylene liquid phase bulk, the temperature is 15°C, and the residence time is about 4 minutes. Under this...

Embodiment 1~30

[0060] Put 100 parts by weight of high melt strength polypropylene, cell nucleating agent (silicon dioxide or zinc borate) and additives into a high-speed mixer and mix at high speed for 30 seconds, then add LabLine100 microparticle preparation system, and the torque is controlled at about 65% , with a rotating speed of 300 rpm, and pelletizing under water to obtain polypropylene resin particles. Among them, the additives include 0.2 parts by weight of antioxidant 1010 (BASF company) and 0.1 part by weight of antioxidant 168 (BASF company); the amount of cell nucleating agent is shown in Table 5.

[0061] Wherein, the type of polypropylene used in Examples 1-15 is HMSPP201, the type of polypropylene used in Examples 16-30 is HMSPP202; the cell composition used in Examples 1-4, 9-12, 16-19 and 24-27 The nucleating agent is silicon dioxide, and the cell nucleating agent used in Examples 5-8, 13-15, 20-23 and 28-30 is zinc borate.

[0062] Specific foaming process: First, in an ...

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Abstract

The invention provides a polypropylene foamed bead. The foamed bead is prepared by foaming a base resin high-melt-strength polypropylene with a foaming agent, wherein the high-melt-strength polypropylene has the following characteristics: the melt index MFR is 0.2-10 g / 10 minutes, the molecular weight distribution Mw / Mn is 6-20, the content of substances with the molecular weight of greater than 5 million is greater than or equal to 0.8 wt%, the M[z+1] / Mn is greater than or equal to 70, and the ethylene content is 0.1-20 wt%. The high-melt-strength polypropylene with wide molecular weight distribution is utilized as the raw material to implement stabilization of the polypropylene raw material, so that the foaming window is effectively enlarged, the technique is easy to adjust, and the cost is low; the method can be used for preparing the polypropylene foamed bead with the density of 0.02-0.3 g / cm<3>, which has the advantages of uniform pore diameter, compact pores, uniform pore size distribution and close-pore structure; and the polypropylene foamed bead can be widely used in the fields of thermal insulation tableware, automobile interior ornaments, architectural moldboards, camping supplies, decorating material interlayers, product damping packages and the like.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a propylene-ethylene high-melt-strength polypropylene foaming bead and a preparation method thereof. Background technique [0002] Traditional polymer foamed plastics mainly include soft and rigid foamed plastics such as polyurethane, polystyrene and polyethylene. Foamed polypropylene material is a polymer / gas composite material with excellent performance. With its unique and superior performance, it has become the fastest growing new environment-friendly anti-pressure buffer heat insulation material. Compared with traditional foamed materials, non-crosslinked polypropylene foamed materials (including foamed beads, foamed boards and sheets, etc.) have excellent mechanical properties and environmental protection properties: excellent heat resistance, the use temperature can be up to 130°C; the dimensional stability of the product at high temperature, the Vicat softening point can re...

Claims

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Application Information

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IPC IPC(8): C08L23/16C08J9/04C08J9/12C08J9/14C08F210/16C08F210/06
CPCC08F210/06C08F210/16C08J9/122C08J2203/06C08J2205/052C08J2323/14C08L23/14C08L2201/06C08L2201/08C08L2203/14C08F210/02C08F2500/04C08F2500/11C08F4/6465
Inventor 郭鹏吕明福张师军刘有鹏张洪波徐萌吕芸
Owner CHINA PETROLEUM & CHEM CORP
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