Method for preparing heat-insulating board for building wall

Abstract

The invention relates to a process for making heat-insulating board in architecture thermal insulation system, which comprises using vitrified pearl, light calcium carbonate, dispersable rubber powder, polypropylene fiber, wood fibre, sodium carboxymethyl cellulose and water as raw material through agitating homogeneously, charging water, spraying water and stirring, compacting and loading into molds, pressurizing demoulding and drying.

Description

technical field [0001] The invention relates to a preparation method of a building wall insulation board, which belongs to the technical field of building materials. Background technique [0002] At present, the commonly used thermal insulation system of building envelope structure mostly adopts thermal insulation materials such as polystyrene foam board, thermal insulation mortar, polyurethane rigid foam, glass wool and rock wool. The Chinese patent application titled "High-strength refractory plant fiber composite thermal insulation board and its production method" with application number 200410000789.7 discloses a composition and preparation method of a refractory thermal insulation board. The main thermal insulation material is expanded perlite. The shortcoming of this prior art is: 1, directly used sodium silicate aqueous solution and organosilicon water-repellent in the formula of prior art, these two kinds of raw materials all are very dilute aqueous solution, after m...

AI Technical Summary

Problems solved by technology

The shortcoming of this prior art is: 1, directly used sodium silicate aqueous solution and organosilicon water-repellent in the formula of prior art, these two kinds of raw materials all are very dilute aqueous solution, after mixing and stirring with perlite etc. The moisture content is relatively large, so that the drying and dehydration stage after molding requires a higher temperature and a longer drying time, which increases the cost of the product

2. Sodium silicate and organic silicon water repellent are both highly alkaline materials, which make the product highly alkaline. As the outer layer of the building insulation system, it is easy to be damp and return to alkali, which will affect the appearance of the outer wall. At the same time, it is easy to rust the steel wire protective net on the outer layer, and make the glass fiber net aging and lose its reinforcing effect.

3. Sodium silicate aqueous solution is used as a binder, and the water resistance after film formation is poor, and it is easy to deliquescence and water seepage, which affects the strength and weather resistance of the product

4. Expanded perlite is used as the main thermal insulation material. Due to the expansion of ore sand during vaporization and crystallization water overflows, perlite has an open-pore particle structure and is easily crushed to form powder. The strength is very low, which reduces the strength of the product. It is easy to absorb water vapor, and the insulation performance of the product will be greatly reduced after moisture absorption

5. During the mixing process of preparing the product, since the perlite is easily broken to form powder, the mixing time should not be too long, but if the mixing time is too short, the glue and the perlite cannot be fully mixed, and there will be a considerable amount of perlite surface that is not Can be fully wrapped by glue, thus affecting the strength of the product, easy to break and break

6. A layer of glass fiber mesh is adhered to the surface of the insulation board. Single-sided glass fiber mesh cannot completely guarantee that the product will not be broken or damaged, because the external force causing the fracture is uncertain