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A kind of preparation method of polypropylene foam beads

A foaming bead and polypropylene technology, applied in the field of polymers, can solve the problems of high melting point, high molding temperature, increased energy consumption and manufacturing cost, etc.

Active Publication Date: 2018-01-23
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing high-rigidity polypropylene resin has a relatively high melting point, so a high molding temperature is required in the molding process, and high-pressure steam needs to be used, so special high-pressure-resistant molding equipment is required to achieve the foamed PP beads. Sufficient melt adhesion between them, thus increasing energy consumption and manufacturing cost

Method used

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

Examples

Experimental program
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Effect test

preparation example Construction

[0045] Preparation of matrix resin HMSPP501

[0046] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0047] 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 TEA...

Embodiment 1～10

[0058] 1) Preparation of polypropylene resin particles: put 100 parts by weight of matrix resin, 0.05 parts by weight of cell nucleating agent (silicon dioxide) and additives into a high-speed mixer and mix at high speed for 30 seconds, then add LabLine100 microparticle preparation system , the torque is controlled at about 65%, the rotation speed is 300rpm, and the polypropylene resin particles are obtained by underwater pelletizing. Wherein, the matrix resin used in Examples 1-5 is HMSPP501, and the matrix resin used in Examples 6-10 is HMSPP502. The used additive of embodiment 1~10 all comprises the antioxidant 1010 (BASF company) of 0.2 weight part, the antioxidant 168 (BASF company) of 0.1 weight part and the calcium stearate of 0.05 weight part. Specifically, after blending the matrix resin, cell nucleating agent and additives with a high-speed mixer, extruding through a twin-screw extruder, introducing a temperature of 75°C or below, preferably 70°C or below, more prefe...

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Abstract

The invention provides a preparation method of polypropylene foamed beads, which comprises the following steps: firstly obtaining polypropylene according to the following method, then using the obtained polypropylene as matrix resin, adding organic peroxide and foaming with a physical foaming agent to prepare The polypropylene foamed beads; wherein, the preparation method of the polypropylene is: in two or more reactors operated in series, two or more stages of propylene polymerization are carried out, and an external electron donor used in the two-stage reaction is carried out. The compounds are silane compounds and diether compounds, respectively. The invention uses high melt strength polypropylene with wide molecular weight distribution as raw material and organic peroxide as the surface modifier of EPP beads, and can prepare uniform cell diameter, dense cell, uniform cell distribution and closed cell structure. The polypropylene expanded beads are widely used in automobile manufacturing, packaging, building insulation, sports equipment, daily necessities and aerospace and other fields.

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] Polypropylene resin is used in many fields because of its excellent mechanical properties, machinability, high heat resistance, high cost performance and recyclability. For the consideration of light weight and rigidity, the use of polypropylene to prepare non-crosslinked foam materials has become the focus of attention in the fields of packaging materials, building materials, and heat insulation materials. In order to obtain products with different shapes and special uses, expanded polypropylene beads (EPP) have become the focus of development. Products of various shapes can be prepared by high-temperature steam molding using EPP. [0003] In the field of automobile manufacturing, PP moldings have been used in various parts, such as sun visors, car interiors, bumper cores, trunk lids, car roofs and flo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J9/12C08L23/12C08L23/14C08K13/02C08K5/14C08F10/06C08F4/649C08F4/646
Inventor 郭鹏吕明福张师军徐耀辉毕福勇尹华杨庆泉
Owner CHINA PETROLEUM & CHEM CORP
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