Preparation method of light, thermal insulation and flame-retardant external wall decorative sheet

Abstract

The invention mainly relates to the technical field of building material processing and discloses a preparation method of a light, thermal insulation and flame-retardant external wall decorative sheet. The preparation method comprises the steps as follows: kaolin modification, waste tile modification, polytetrafluoroethylene modification, primary mixing, secondary mixing, third-time mixing and extrusion forming. The preparation method of the light, thermal insulation and flame-retardant external wall decorative sheet is simple, raw materials are wide, the obtained external wall decorative sheet has high strength, light mass and higher flame-retardant and thermal insulation effects, energy can be saved, and safety of residents can be guaranteed.

Description

technical field [0001] The invention mainly relates to the technical field of building material processing, in particular to a preparation method of a light-weight thermal insulation and flame-retardant exterior wall decorative board. Background technique [0002] The exterior wall decoration board is a new type of building exterior wall decoration and heat preservation integrated material developed in recent years. At present, the traditional exterior wall decoration board is composed of polyester baking paint or fluorocarbon paint, carved aluminum-zinc alloy steel plate, polyurethane insulation layer, and glass fiber cloth. It is mainly used in exterior wall decoration and energy-saving renovation of various buildings such as gymnasiums, libraries, school and hospital office buildings, and villas. It plays the role of decoration, heat preservation and waterproof, but at present, many decoctions are high-rise, with a ventilation shaft structure, so that the ventilation effe...

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Problems solved by technology

[0002] The exterior wall decoration board is a new type of building exterior wall decoration and heat preservation integrated material developed in recent years. At present, the traditional exterior wall decoration board is composed of polyester baking paint or fluorocarbon paint, carved aluminum-zinc alloy steel plate, polyurethane insulation layer, and glass fiber cloth. It is mainly used in exterior wall decoration and energy-saving renovation of various buildings such as gymnasiums, libraries, school and hospital office buildings, and villas. It plays the role of decoration, heat preservation and waterproof, but at present, many decoctions are high-rise, with a ventilation shaft structure, so that the ventilation effect of the outer wall is excellent. In case the outer wall catches fire, the fire will spread rapidly along the outer wall, making the ignition point The safety of the above residents is seriously threatened, so it is necessary for the exterior wall decorative panels to have a good flame retardant effect

[0003] The existing patent document CN107540971A discloses a new type of flame-retardant exterior wall decorative board and its preparation method. Although the flame-retardant exterior wall decorative board disclosed in the patent document has a good flame-retardant effect, it is difficult to burn when exposed to an open flame, but the added polyvinyl chloride has poor stability to light and heat, and the glass transition temperature is 77-90 ℃, starts to decompose at around 170 ℃, and has poor stability to light and heat. When it is above 100 ℃ or exposed to sunlight for a long time, it will decompose and produce hydrogen chloride, and further autocatalyze the decomposition, causing discoloration. Although it cannot light an open flame, it is relatively The high temperature is enough to decompose PVC, and it will also completely destroy the flame-retardant exterior wall decorative panels, losing the decorative and flame-retardant effects of the decorative panels, so it is necessary to improve the strength and light and heat resistance of the decorative panels

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