Coating technology for lowering expanded perlite water adsorption rate used for thermal insulation wallboard

Abstract

The invention relates to a coating technology for lowering an expanded perlite water adsorption rate used for a thermal insulation wallboard. The coating technology comprises the following steps: S1:evenly mixing two parts of surfactant with 100 parts of water to obtain the mixture of surfactant and water; S2: spraying the mixture of surfactant and water to the surfaces of expanded perlite particles to enable the expanded perlite particles to be preliminarily wet; S3: according to a mix proportion, stirring silicate cement into flowing cement slurry; S4: spraying the cement slurry to the expanded perlite particles, and discharging until the expanded perlite particles are completely coated; S5: conserving for six hours under a condition of room temperature, and after the silicate cement iscompletely condensed and hardened, forming an even coating layer with the thickness of 1-2mm on the outer part of the expanded perlite. According to the coating technology, the surface of the expanded perlite with a high water adsorption rate is coated with one layer of high-intensity silicate cement shell layer, the coated expanded perlite has higher intensity, in addition, the water adsorptionperformance of the particles can be obviously reduced, and the water adsorption rate is only 1.8% in one hour.

Description

Technical field [0001] The invention belongs to the technical field of building materials, and specifically relates to a wrapping technology for reducing the water absorption rate of expanded perlite for thermal insulation wallboards, and is mainly used for the production of thermal insulation wallboards for prefabricated buildings such as civil residences and office buildings. Background technique [0002] Expanded perlite wall insulation materials have the advantages of good thermal insulation, low price, convenient construction, etc., and are the development direction of my country's building energy-saving wall materials. [0003] However, expanded perlite has the following problems in the process of use: First, the high porosity and high water absorption increase the water demand of the mortar, destroy the solidification cycle of the mortar, greatly reduce the mechanical properties of the mortar, and easily produce hollowing. , Cracking, which seriously affects the thermal perf...

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Problems solved by technology

[0005] The present invention aims at the deficiencies in the prior art that the expanded perlite has large porosity, rough surface, and low compressive strength after being made into wallboards, and aims to provide a wrapping technology for reducing the water absorption of expanded perlite for thermal insulation wallboards. The expanded perlite produced by this technology is covered with a thin layer of high-strength Portland cement shell, which has the characteristics of high strength and low water absorption, and can significantly improve the strength of the assembled thermal insulation wallboard. It is suitable for thermal insulation, In residential buildings, office buildings and other buildings with high heat insulation and sound insulation requirements

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