A kind of preparation method of polypropylene expanded beads

A foaming bead and polypropylene technology, applied in the field of polymers, can solve the problems of narrow foaming window and unfavorable large-scale production, and achieve the effect of uniform cell diameter, low cost and uniform pore size distribution

Active Publication Date: 2017-05-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, due to the special semi-crystalline nature of polypropylene, its foaming window is narrow, which is not conducive to industrial mass production

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

[0037] Preparation of matrix resin HMSPP501

[0038] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0039] 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 1～30

[0050] First, the microparticles comprising 100 parts by weight of the matrix resin and the cell nucleating agent (silicon dioxide or zinc borate) shown in Table 2, and the additives are put into a high-speed mixer and mixed at high speed for 30 seconds, Add LabLine100 microparticle preparation system, control the torque at about 65%, rotate at 300rpm, and pelletize under water to obtain polypropylene resin particles. Wherein, the matrix resin used in Examples 1-15 is HMSPP501, and the matrix resin used in Examples 16-30 is HMSPP502. The cell nucleating agent used in Examples 1 to 4, 9 to 12, 16 to 19 and 24 to 27 is silicon dioxide, and the cells used in Examples 5 to 8, 13 to 15, 20 to 23 and 28 to 30 The nucleating agent is zinc borate. The additives used in Examples 1-30 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 ...

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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 physical 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 size distribution, a closed pore structure and density of 0.03-0.4g / cm<3> and can be widely used in fields of thermal insulation tableware, automobile interior decorative parts, building templates, camping articles, decorative material interlayers and product damping packages.

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, non-toxic gas rel...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08J9/14C08L23/12C08K3/38C08K3/36C08K3/34C08K3/26C08K3/22C08F110/06C08F4/649C08F4/646
Inventor 郭鹏吕明福张师军毕福勇刘有鹏徐萌
Owner CHINA PETROLEUM & CHEM CORP
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