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High temperature-resistant imide-polyvinyl chloride alloy structure foam and preparation method thereof

A technology of polyvinyl chloride and polyvinyl chloride resin, which is applied in the field of imide-polyvinyl chloride alloy structural foam and its preparation, can solve the problems of inability to effectively increase the use temperature of polyvinyl chloride structural foam and the promotion of production costs, and achieve Small size deformation, wide application range, fine and uniform cells

Active Publication Date: 2016-05-04
CHANGZHOU TIANSHENG NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, none of the above technologies can effectively increase the service temperature of polyvinyl chloride structural foam, which leads to the fact that this new structural foam material with excellent comprehensive performance, relatively low production cost, and a preparation process that is convenient for large-scale production cannot be used in the epoxy resin composite system. mass promotion

Method used

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  • High temperature-resistant imide-polyvinyl chloride alloy structure foam and preparation method thereof
  • High temperature-resistant imide-polyvinyl chloride alloy structure foam and preparation method thereof
  • High temperature-resistant imide-polyvinyl chloride alloy structure foam and preparation method thereof

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preparation example Construction

[0037] A preparation method of high temperature resistant imide-polyvinyl chloride alloy structural foam, comprising the following steps:

[0038] (1) get polyvinyl chloride resin, organic dianhydride, isocyanate, stabilizer and initiator and mix uniformly to obtain mixture;

[0039] (2) injecting the mixture into a mould, and forming a semi-foamed embryo body at a temperature of 150-200° C. and a pressure of 8-30 MPa;

[0040] (3) keep the pressure constant, make the semi-foamed embryo body cool to normal temperature and then release the pressure to obtain the elastic massive embryo body;

[0041] (4) Heat and expand the obtained elastic block-shaped embryo body in a drying oven at a temperature of 70-100° C. to obtain a semi-finished product;

[0042] (5) the semi-finished product obtained in step (4) is placed in a hot water bath or steam to expand to obtain block foam;

[0043] (6) Cool the block foam to room temperature, and then solidify it in hot water spray or steam ...

Embodiment 1

[0045] 1. Recipe

[0046] A high temperature resistant imide-polyvinyl chloride alloy structural foam, which includes the following components by weight: 100 parts of polyvinyl chloride resin, 27 parts of bisphenol A diether dianhydride, 56 parts of hexamethylene diisocyanate 1 part, 3 parts of azobisisobutyronitrile, 1 part of azodicarbonamide, and 2 parts of epoxy resin.

[0047] 2. Preparation method

[0048] Mix the above raw materials evenly and pour them into the mold, put them into a 180°C, 30MPa plate press and heat them for 54 minutes to cool to room temperature, then take them out, and then place the embryo body in a dry oven at 100°C to expand to about 5 to 6 times. Then transfer it to a water bath at 97±2°C for about 3 hours to reach the required density, and then solidify it in a hot water spray room at 70°C for 5 days to obtain a rigid imide-polyvinyl chloride alloy structural foam.

Embodiment 2

[0050] 1. Recipe

[0051]A high temperature resistant imide-polyvinyl chloride alloy structural foam, which includes the following components in parts by weight: 100 parts of polyvinyl chloride resin, 18 parts of pyromellitic dianhydride, 4.5 parts of azobisisobutyronitrile, 1.5 parts of azodicarbonamide, 38 parts of isophorone diisocyanate, and 1 part of epoxy resin.

[0052] 2. Preparation method

[0053] Mix the above raw materials evenly, pour them into the mold, put them into a 170°C, 10MPa plate press, heat them for 63 minutes, cool to room temperature, take them out, then place the embryo body in a dry oven at 95°C to expand to about 5 to 6 times, and then Transfer to a saturated steam oven at 96±2°C for about 4 hours to reach the desired density, and then solidify in a hot water spray room at 60°C for 6 days to obtain a rigid imide-polyvinyl chloride alloy structural foam.

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Abstract

The invention belongs to the technical field of novel materials and relates to high temperature-resistant imide-polyvinyl chloride alloy structure foam and a preparation method thereof. The high temperature-resistant imide-polyvinyl chloride alloy structure foam comprises, by weight, 100 parts of polyvinyl chloride resin, 1-30 parts of organic dianhydride, 30-150 parts of isocyanate, 0-10 parts of a stabilizer and 1-12 parts of an initiator. The high temperature-resistant imide-polyvinyl chloride alloy structure foam has uniform foam apertures, excellent mechanical properties, closed porosity of 97% or more, density of 60kg / m<3> and compression strength of 0.8-1.2MPa. Compared with the common polyvinyl chloride structure foam, the high temperature-resistant imide-polyvinyl chloride alloy structure foam has better temperature resistance and improves a processing temperature upper limit by 30-40%. The high temperature-resistant imide-polyvinyl chloride alloy structure foam provides a strong support for use in a preimpregnation process and development of an advanced composite material technology.

Description

technical field [0001] The invention belongs to the technical field of new materials, and in particular relates to a high-temperature-resistant imide-polyvinyl chloride alloy structural foam and a preparation method thereof. Background technique [0002] As we all know, in the technical field of polymer materials, polyimide foam is one of the most important application forms of polyimide materials. Polyimide foam has good heat insulation and noise reduction performance, heat resistance, radiation resistance and electrical properties, etc., and has been widely used in aviation, aerospace, automobiles, launch vehicles, railway locomotives, ships, electronics and other fields. The research on polyimide foam materials started in the mid-1960s, and there have been many technical routes to produce polyimide foam materials, but the high cost hinders its large-scale manufacture and market promotion. [0003] At present, the foams used as structural materials mainly include rigid po...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08L79/08C08G73/10C08J9/08
CPCC08G73/1035C08J9/08C08J2327/06C08J2479/08C08L27/06C08L2201/08C08L2203/14C08L79/08
Inventor 朱文强顾鑫魏方明郑步伟
Owner CHANGZHOU TIANSHENG NEW MATERIALS
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