Method for preparing toughened phenolic foam board for exterior insulation of exterior building walls

Abstract

The invention discloses a method for preparing an toughened phenolic foam board for exterior insulation of exterior building walls. The toughened phenolic foam board selects phenolic resin, a surfactant, a foaming agent, a curing agent and a toughener as raw materials, wherein the surfactant is tween 80, the foaming agent is cyclopentane or n-pentane, the curing agent is a mixed acid prepared by phosphoric acid and p-toluenesulfonic acid with a weight ratio of 2 : 1, and the toughener is prepared from acrylic styrene copolymer emulsion, modified wollastonite fiber, a phosphorus-based flame retardant, and a polydimethylsiloxane aqueous emulsion. The toughened phenolic foam board for the exterior insulation of the exterior building walls prepared by the invention can not only greatly improve the toughness and strength of the prior phenolic foam board, but also well solve problems of reduced nonflammable performance and increased smoke density and smoke toxicity in existing toughening ways, and can be widely applied in the exterior insulation of the exterior building walls.

Description

technical field [0001] The invention relates to a preparation method of a phenolic foam board for external insulation of building exterior walls, in particular to a preparation method of a toughened phenolic foam board for external insulation of building exterior walls. Background technique [0002] In recent years, since a large number of combustible thermal insulation materials have been widely used in the external wall insulation of public and civil buildings, there have been many vicious building external thermal insulation fire accidents in China, causing heavy casualties and property losses. For this reason, the country has put forward higher requirements on the fire performance of building insulation materials, and relevant departments have also issued some regulations to strengthen the inspection and supervision of building design, construction and acceptance. At the same time, my country will further improve building energy efficiency during the "Twelfth Five-Year P...

AI Technical Summary

Problems solved by technology

At present, the toughening of phenolic foam is mainly achieved through the following methods: ①Add rubber elastomers or thermoplastic resins such as polyvinyl alcohol and polyethylene glycol to the system to achieve the purpose of toughening by blending, although this method It can improve the toughness of the phenolic foam board, but reduces the flame retardancy of the phenolic foam board; ②Graft the flexible chain through the chemical reaction of phenolic hydroxyl and methylol, such as the reaction of phenolic resin and polyurethane, so as to obtain toughened phenolic resin, This modification method is better than the blending method, but this method will increase the smoke density and smoke toxicity of the phenolic foam board

[0003] The purpose of this invention is to provide a kind of preparation method of the toughened phenolic foam board for exterior insulation of building exterior wall, this method can not only improve the toughness and strength of phenolic foam board greatly, and can well solve the existing toughening way The problems of reduced flame retardancy, increased smoke density and smoke toxicity

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