A kind of modified building material and preparation method thereof

Abstract

The invention provides a modified building material, which comprises the components of the following formula: 50-80 parts by weight of material A, 100-300 parts by weight of material B and 20-50 parts by weight of auxiliary materials, wherein material A is a surface-modified polymer Ester polyol, material B is modified polymeric isocyanate, auxiliary materials include: catalyst, blowing agent, toughening agent, wherein the preparation method of modified polymeric isocyanate is: add 2-5 weight in 100 parts of polymeric isocyanate (crude MDI) Parts of epoxy resin, heated to 100-126°C, stirred for 15-40min, then continued to add 1-3 parts by weight of soft foam glycerol polyether, maintained the temperature and stirred for 1-3min, then added 2-5 parts by weight of carbodiimide Stir for 2-5min, let stand after cooling, and obtain 103-110 parts by weight of modified isocyanate. In the present invention, soft foam glycerol polyether is added in the preparation of modified polymeric isocyanate, and the degree of crosslinking is greatly improved when it reacts with polyols, which is used to increase product saturation, toughness and elasticity, and prevent the product from being easily damaged and cracked.

Description

technical field [0001] The invention belongs to the technical field of modification and preparation of building materials, and relates to a modified building material and a preparation method thereof. Background technique [0002] At present, the development of ecological architecture in various places is in its infancy, and Western Europe and Northern Europe are relatively well-developed regions. In recent years, architects from various countries are concentrating on researching the material technology and building structure manufacturing methods of ecological architecture. my country has also issued a series of national long-term development plans and implementation policies for green building materials. It is strictly forbidden to use traditional cement mortar and other materials in ecological nature reserves for project development and construction. Scientifically reduce deforestation and damage to natural landscapes, rocks and water bodies, make nature a part of architec...

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Problems solved by technology

[0006] The purpose of the present invention is to solve the problem that the performance of logs and imitation wood materials in the prior art is not ideal in terms of anti-aging, thermal insulation, sound insulation, fire prevention, insect resistance and corrosion resistance, and now provides a modified building material formula and its preparation method

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