Cross-linked polyvinyl chloride foam and its preparation method

A technology of cross-linked polyvinyl chloride and foam, which is applied in the field of foam materials, can solve the problems of long time consumption, achieve the effects of improving quality and heat resistance, improving moisture diffusion, and reducing time

Active Publication Date: 2018-02-13
CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the time-consuming problem of the method for preparing cross-linked polyvinyl chloride foam in the prior art, improve the quality and heat resistance of the foam, and provide a cross-linked polyvinyl chloride foam and its preparation method

Method used

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  • Cross-linked polyvinyl chloride foam and its preparation method
  • Cross-linked polyvinyl chloride foam and its preparation method
  • Cross-linked polyvinyl chloride foam and its preparation method

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preparation example Construction

[0040] The preparation method of the cross-linked polyvinyl chloride foam includes the following steps:

[0041] Step 1. After weighing the components according to the composition and parts by weight, the components are mixed uniformly to obtain a paste material;

[0042] Wherein, when the catalyst is one or more of indole, sodium caprylate, potassium isooctanoate, potassium oleate, and potassium stearate, the components can be mixed in any order, as long as they are evenly mixed;

[0043] When the catalyst contains N',N”,N”'-tris(dimethylaminopropyl) symmetric hexahydrotriazine, because N',N”,N”'-tris(dimethylaminopropyl) Symmetric hexahydrotriazine has strong catalytic activity. When it is compounded with isocyanate, the reaction temperature rises quickly. If there are other components in the environment, the viscosity of other components will rise quickly, and even good mixing will not be completed. ; So when the catalyst contains N',N”,N”'-tris (dimethylaminopropyl) symmetric he...

Embodiment 1

[0054] The crosslinked polyvinyl chloride foam consists of 100 parts by weight of PVC resin, 50 parts by weight of liquefied MDI, 20 parts by weight of bisphenol A glycidyl ether, 1 part by weight of potassium stearate and 15 parts by weight of foaming agent H.

[0055] The preparation method of the above cross-linked polyvinyl chloride foam:

[0056] Mix 100 parts by weight of PVC resin, 50 parts by weight of liquefied MDI, 20 parts by weight of bisphenol A glycidyl ether, 1 part by weight of potassium stearate and 15 parts by weight of blowing agent H, and add them to a 22mm thick mold. Carry out foaming and molding at a temperature of 200°C and a pressure of 19MPa, heat preservation for 660s, and cool to 71°C to open the mold to obtain a pre-foamed body;

[0057] Then place the obtained pre-foamed body in 95℃ hot water for secondary expansion for 40 minutes, then place the secondary expanded foam in 65℃ saturated steam for curing and crosslinking, and use infrared absorption spect...

Embodiment 2

[0059] Cross-linked polyvinyl chloride foam, composed of: 30 parts by weight of TDI, 40 parts by weight of methylhexahydrophthalic anhydride, 40 parts by weight of tetrahydrophthalic anhydride, 0.2 parts by weight of N',N”,N”'-tris(dimethylamino) Propyl) symmetric hexahydrotriazine, 100 parts by weight of PVC resin and 1 part by weight of AC.

[0060] The preparation method of the above cross-linked polyvinyl chloride foam:

[0061] First, 30 parts by weight of TDI, 40 parts by weight of methylhexahydrophthalic anhydride, and 40 parts by weight of tetrahydrophthalic anhydride are mixed uniformly to obtain a mixture, and then the mixture is quickly poured into 0.2 parts by weight of N', N", N"'- In a container of tris(dimethylaminopropyl) symmetric hexahydrotriazine, stir and mix well, then pour 100 parts by weight of PVC resin and 1 part by weight of AC into the container, mix well, and obtain a paste material;

[0062] Put the paste material into a 22mm thick mold with a cavity, fo...

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Abstract

The invention discloses crosslinking polyvinyl chloride foam and a preparation method thereof, and belongs to the technical field of foamed materials. The problem of long time consumption of preparation of a crosslinking polyvinyl chloride foamed material in the prior art is solved, so that the quality and heat-resistant performance of the foamed material can be improved. The crosslinking polyvinyl chloride foam comprises the components in parts by weight: 100 parts of PVC resins, 30-150 parts of isocyanate, 1-15 parts of foaming agents, 0-80 parts of anhydride, 0-20 parts of epoxy compounds and 0.02-4 parts of catalysts, wherein the catalyst is one or more of N',N'',N'''-tri(dimethyl aminopropyl) symmetrical hexahydro-triazine, N-(alpha-ethoxyl) dimethylenimine, indole, sodium caprylate, isocaprylic acid, potassium oleate and potassium stearate. The foamed material is high in quality and heat-resistant performance, and high in production efficiency.

Description

Technical field [0001] The invention belongs to the technical field of foam materials, and specifically relates to a cross-linked polyvinyl chloride foam and a preparation method thereof. Background technique [0002] Polyvinyl chloride cross-linked foam materials are widely used in construction, building materials, decoration, furniture, advertising, automotive and other industries due to their wide operating temperature and good corrosion resistance. In the prior art, the components of rigid polyvinyl chloride cross-linked foam materials mainly include polyvinyl chloride resin, blowing agent, isocyanate and acid anhydride, and different modification components, such as styrene, acrylonitrile, etc. Dimensional stability of foam material. [0003] The preparation method of polyvinyl chloride cross-linked foam material in the prior art is as follows: first mix solid materials and liquid materials to obtain paste materials, then pour the paste materials into a mold, and increase the...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08J9/10C08J9/08C08J3/24B29C43/02B29C43/58B29C37/00
CPCB29C37/00B29C43/02B29C43/58B29C2043/5808B29C2043/5816C08J3/242C08J9/08C08J9/102C08J9/103C08J9/107C08J2327/06C08L27/06
Inventor 唐涛姜治伟
Owner CHANGCHUN INST OF APPLIED CHEMISTRY - CHINESE ACAD OF SCI
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