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Preparation method of polypropylene foaming plate or sheet

A foamed sheet and polypropylene technology, applied in the field of polymers, can solve the problems of low cell density, poor mechanical properties, unevenness, etc., and achieve the effect of low cost, smooth surface and uniform cell diameter

Active Publication Date: 2014-12-31
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] When the foamed board or sheet is used for building partitions, file folders, etc., higher mechanical properties are required, and there is a higher requirement for modulus strength. The foamed board obtained from ordinary homopolypropylene cannot meet this requirement. ; and its cell density is low and uneven, resulting in poor mechanical properties

Method used

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  • Preparation method of polypropylene foaming plate or sheet
  • Preparation method of polypropylene foaming plate or sheet
  • Preparation method of polypropylene foaming plate or sheet

Examples

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preparation example Construction

[0027] Preparation of matrix resin HMSPP501

[0028] The polymerization reaction was carried out on a polypropylene pilot plant. Its main equipment includes prepolymerization reactor, first loop reactor and second loop reactor.

[0029] 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 1～12

[0044] Put 100 parts by weight of homopolypropylene HMSPP501 or HMSPP502, foaming agent, cell control agent (talc powder) and additives into a high-speed mixer and mix at high speed for 1 minute, then add the middle layer to the twin-screw extruder, and the torque is controlled at About 65%, the speed is 10-170rpm. Among them, the additives include acid absorbing agent calcium stearate, antioxidant (calcium stearate with a weight ratio of 1:2:2, BASF antioxidant 1010 and antioxidant 168 compounded, accounting for 0.2 parts by weight in total) and Lubricant MB50-002 (high molecular weight polysiloxane), the weight parts of cell control agent, foaming agent and lubricant are shown in Table 2; the foaming temperature and the density of the product sheet are shown in Table 2, specifically GB / T1033 .1-2008 for density measurements.

[0045] Among them, in Examples 4, 5, 11 and 12, HMSPP502 was used as the matrix resin, while in the remaining examples, HMSPP501 was used as the matr...

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Abstract

The present invention provides a preparation method of a polypropylene foaming plate or sheet. According to the preparation method, high melt strength homopolymerization polypropylene is adopted as a matrix resin and a foaming agent is adopted to foam to prepare the polypropylene foaming plate or sheet, wherein the homopolymerization polypropylene preparation method comprises: in two or more than two reactors having the series connection operation, carrying out a two-stage or multi-stage propylene homopolymerization reaction, wherein the external electron donors used in the two-stage reaction are respectively a silane compound and a diether compound. According to the present invention, the high melt strength polypropylene having the wide molecular weight distribution is adopted as the raw material to achieve the stabilization of the polypropylene raw material, such that the foaming window is effectively expanded, the process is easy to adjust, the polypropylene foaming plate or sheet having the smooth self-skinning, the uniform foam hole diameter, the closed hole rigid structure, the density of 0.2-0.9 g / cm<3> and the thickness of 0.1-400 mm can be prepared, and the polypropylene foaming plate or sheet can be widely used in the fields of heat-insulation tableware, automotive interiors, building templates, camping supplies, decoration material sandwiches, product vibration reduction packaging and the like.

Description

technical field [0001] The invention relates to the field of macromolecules, in particular to a method for preparing a polypropylene foam board or sheet. Background technique [0002] Foamed materials mainly include foamed beads, foamed plates or sheets and other apparent forms; foamed plates or sheets are widely used in the fields of containers, building materials, auto parts and impact energy absorbing materials. [0003] PP foam sheet is mainly processed by extrusion method. Extrusion is highly productive and easy to automate. Early PP foam sheets were mostly prepared by a two-step extrusion foam molding method using a cross-linking process. That is, PP resin is fully mixed with foaming agent, crosslinking agent, nucleating agent, etc., and then extruded into a sheet on an extruder, and then the unfoamed PP sheet is crosslinked, and then foamed in a foaming furnace. Foam molding, cross-linking can use two methods of radiation cross-linking and chemical cross-linking, t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F110/06C08F4/649C08F4/646C08J9/10C08J9/12C08L23/12
Inventor 郭鹏吕明福张师军毕福勇徐凯吕芸邵静波
Owner CHINA PETROLEUM & CHEM CORP
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