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Formulation of polymer mixture for producing crosslinked foamed pvc foam and method of producing the foam

A mixture, foam technology, applied in the field of composite materials, can solve dangerous, undesirable and other problems

Active Publication Date: 2021-05-14
DIAB INT AB
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] However, the traditional mixtures mentioned above have the disadvantage of using azo compounds such as ADC and AZDN, which is not desirable because they are dangerous

Method used

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  • Formulation of polymer mixture for producing crosslinked foamed pvc foam and method of producing the foam
  • Formulation of polymer mixture for producing crosslinked foamed pvc foam and method of producing the foam
  • Formulation of polymer mixture for producing crosslinked foamed pvc foam and method of producing the foam

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Embodiment Construction

[0023] The purpose of the polymer mixture for the production of cross-linked foamed PVC foams of the present invention is to provide foamed materials free of azo compounds, characterized in that there are closed cells with a diameter of less than or equal to 0.6 mm, i.e. small enough to impart Homogeneous structure of foamed products with low thermal conductivity, reduced resin adsorption and higher glass transition temperature.

[0024] In order for the gas to be able to generate stable nuclei, capable of forming closed cells with small diameters, a certain energy threshold must be exceeded, which for this reason must be as low as possible. This energy threshold depends in particular on the critical radius of the core, which in turn depends on the interfacial tension between the gas bubble and the polymer mass. In the polymer mixture system of the present invention, which becomes inhomogeneous due to the presence of a nucleating agent, the excess free energy AGet is represent...

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Abstract

A formulation of a polymer mixture for producing cross-linked expanded PVC foam, the formulation being of the type comprising PVC, isocyanate, anhydride and one or more nucleating agents, wherein the nucleating agent consists of a porosity of 1-100nm, preferably 2-50nm nucleating material composition. Compared to known formulations for the production of crosslinked PVC foams, the formulations according to the invention offer the advantage of obtaining the desired degree of stability, nucleation and foaming even without the use of azo compounds.

Description

technical field [0001] The present invention relates to the formulation of polymer mixtures for the production of crosslinked expanded PVC foams. The same invention also extends to the method for producing said crosslinked expanded PVC foam. [0002] The field of the invention relates to cross-linked expanded PVC foam for the production of foamed materials such as PVC panels, which is used as a core in the field of composite materials. Background technique [0003] Cross-linked foamed PVC foams are traditionally prepared starting from a mixture comprising: PVC, an isocyanate with cross-linking functionality, an anhydride intended to react with water and isocyanate to form amides during the foaming and cross-linking stages, Blowing agents based on azo compounds for gas formation (azobisisobutyronitrile AZDN), and nucleating and stabilizing agents also based on azo compounds (azodicarbonamide ADC). [0004] Specifically, in the field of cross-linked PVC foam production, conv...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L27/06C08J9/00C08J9/02C08J9/08
CPCC08J9/0066C08J9/02C08J9/08C08J2201/026C08J2203/02C08J2205/052C08J2327/06C08J2300/208C08J9/0061C08J9/228C08K3/26C08K3/34C08K5/0025C08K5/16C08L27/06C08J2479/08
Inventor R·布雷森F·纳特M·雷浓U·托格森
Owner DIAB INT AB