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Hard PVC structural foam, and preparation method and shaping mold thereof

A technology for forming molds and PVC resins, applied in the field of foam materials, can solve problems such as high brittleness, shortened service life, and limited application range, and achieve the effects of light weight, increased back pressure, and improved melt viscosity

Pending Publication Date: 2018-06-29
HENAN UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Currently disclosed polyvinyl chloride cross-linked foam basically adopts maleic anhydride and phthalic anhydride as the necessary formula composition, mainly the IPN polymer foam composed of polyamide-polyimide-polyvinyl chloride-polyisocyanate-polyurea , the material is brittle, which limits its application range and shortens its service life

Method used

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  • Hard PVC structural foam, and preparation method and shaping mold thereof
  • Hard PVC structural foam, and preparation method and shaping mold thereof
  • Hard PVC structural foam, and preparation method and shaping mold thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0030] This embodiment provides a rigid PVC structural foam, which is mainly prepared from the following raw materials in parts by weight: 150 parts of PVC resin, 30 parts of isocyanate, 2 parts of supercritical fluid foaming agent, and 1 part of water vapor. Wherein, the isocyanate is toluene diisocyanate, and the supercritical fluid blowing agent is supercritical carbon dioxide.

[0031] This embodiment also provides a method for preparing the rigid PVC structural foam, which specifically includes the following steps:

[0032] To prepare the foamed body, weigh PVC resin, isocyanate, supercritical carbon dioxide and water vapor according to the ratio of raw materials in the rigid PVC structural foam; heat the PVC resin to melt it, and add the isocyanate to it Melt and knead for 1 min, and obtain a foamed green body after cooling;

[0033] Perform primary foaming: place the foamed body in a closed mold cavity, heat the foamed body at a temperature of 60°C for 30 minutes to un...

Embodiment 2

[0046] This embodiment provides a rigid PVC structural foam, which is mainly prepared from the following raw materials in parts by weight: 110 parts of PVC resin, 45 parts of isocyanate, 3 parts of supercritical fluid foaming agent, and 0.5 part of water vapor. Wherein, the isocyanate is polymethylene polyphenyl polyisocyanate, and the supercritical fluid foaming agent is supercritical nitrogen.

[0047] This embodiment also provides a method for preparing the rigid PVC structural foam, which specifically includes the following steps:

[0048] Prepare the foamed body by weighing PVC resin, isocyanate, supercritical fluid foaming agent and water vapor according to the raw material ratio in the rigid PVC structural foam; heat the PVC resin to melt it, and then add the Melt and knead the isocyanate for 0.5 min, and obtain a foamed body after cooling;

[0049] Perform primary foaming Place the foamed body in a closed mold cavity, heat the foamed body at a temperature of 130°C for...

Embodiment 3

[0057] The present embodiment provides a rigid PVC structural foam, which is mainly made of the following raw materials in parts by weight: 95 parts of PVC resin, 57 parts of isocyanate, 3.7 parts of supercritical fluid foaming agent and 2 parts of water vapor, the supercritical The fluid blowing agent is supercritical carbon dioxide.

[0058] This embodiment also provides a method for preparing the rigid PVC structural foam, which specifically includes the following steps:

[0059] Prepare the foam body: weigh PVC resin, isocyanate, supercritical carbon dioxide and water vapor according to the raw material ratio in the rigid PVC structural foam; heat the PVC resin to melt it, and add the The isocyanate is melted and kneaded for 0.5 min, and the foamed body is obtained after cooling; foaming is performed once: the foamed body is placed in a closed mold cavity, and the foamed body is heated to make it melt to form a cross The cross-linked melt is subjected to primary foaming a...

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Abstract

The invention provides hard PVC structural foam which is mainly prepared from, by weight, 80-150 parts of PVC resin, 30-60 parts of isocyanate, 0.5-10 parts of a supercritical fluid foamer, and 0.5-5parts of water vapor. The invention also provides a method and a shaping mold for preparing the hard PVC structural foam. The method includes the steps of preparing a foaming green body, performing primary foaming and secondary foaming and producing finish product. The shaping mold includes a cylindrical mold side board and an upper mold plate and a lower mold plate which are respectively arrangedon the upper and lower ends of the cylindrical mold side board in a sealing manner. Pressure applying devices are respectively connected to the upper mold plate and the lower mold plate. A side wallof the cylindrical mold side board is provided with an air inlet hole and an air exhaust hole. The hard PVC structural foam has high strength, is light in weight, is high in rigidity, and is anti-corrosion, electric-insulation and microwave-permeable. The preparation method is short in time and high in work efficiency, and can shorten the whole process to within 2 days.

Description

technical field [0001] The invention belongs to the technical field of foam materials, and in particular relates to a rigid PVC structural foam, a preparation method thereof and a molding die. Background technique [0002] Rigid PVC structural foam is widely used in aerospace and other fields with high load-bearing requirements due to its excellent characteristics such as high strength, light weight, high rigidity, corrosion resistance, electrical insulation, and microwave transmission. U.S. Patent No. US3200089 introduces an acid anhydride compound containing polymerizable C=C and a vinyl comonomer in the polyvinyl chloride foam system, which first grafts these monomers on the polyvinyl chloride molecular chain, and then utilizes Amino groups hydrolyzed by isocyanate are cross-linked to provide dimensional stability and solvent resistance of the foam. [0003] Currently disclosed polyvinyl chloride cross-linked foam basically adopts maleic anhydride and phthalic anhydride ...

Claims

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Application Information

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IPC IPC(8): C08L27/06C08J9/12C08J9/08C08J9/10B29C44/04B29C44/08B29C44/34B29C44/58B29C44/60
CPCC08J9/08C08J9/10C08J9/122B29C44/0407B29C44/0415B29C44/08B29C44/3403B29C44/3415B29C44/3426B29C44/58B29C44/60C08J2203/06C08J2203/10C08J2203/08C08J2203/184C08J2327/06Y02P20/54
Inventor 王心超秦立祥耿铁吴海宏何文平邓鹏辉蔡刚毅郭永刚
Owner HENAN UNIVERSITY OF TECHNOLOGY
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