Vacuum foamed low-temperature foam glass material and its preparation method and application

Abstract

The invention discloses a vacuum foaming low-temperature foam glass material as well as a preparation method and application thereof. The material is prepared by taking an alkali metal silicate aqueous solution and a glass matrix modifier as raw materials through a wet chemical method under a vacuum low-temperature condition, wherein the chemical formula of the alkali metal silicate aqueous solution is R2O.mSiO2.H2O; the modulus m ranges from 2.4 to 2.8, and R is one or more of Li, Na and K; the glass matrix modifier is a boron-containing raw material and an aluminum-containing raw material, the boron-containing raw material is boric acid; and the aluminum-containing raw material is one or more of bentonite and montmorillonite. The material can be applied to multiple fields, including thefields of wall insulation and photo-catalysis. The energy consumption is saved, the cost is reduced, and the material stability is improved. The foam glass material has controllable open-close porosity, and is suitable for industrial application; and the preparation method is carried out under wet chemical conditions in the whole process, produces less dust and is ecological and environmentally friendly.

Description

technical field [0001] The invention belongs to the field of foam glass material and its preparation, in particular to a vacuum-foamed low-temperature foam glass material and its preparation method and application. Background technique [0002] Foam glass is an inorganic thermal insulation material with light weight and low thermal conductivity. The main mechanism is that the glass melt wraps the bubbles generated by the decomposition of the foaming agent at high temperature to form a porous system. The traditional preparation method is the powder sintering method, using waste glass as the main raw material, adding a certain amount of foaming agent, flux, foam stabilizer, surfactant and other additives, forming a powder body, according to a certain heat system Foam to get the corresponding products. For example, CN107200474A (a foam insulation material and its preparation method), CN101132999 (a method for preparing foam glass particles), CN103570246A (a method for preparin...

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Problems solved by technology

However, the firing temperature of this method is relatively high, generally reaching above 900°C. The energy consumption in the production process is huge, and the material cost is high. At the same time, the closed porosity of the obtained foam glass is too high. Water droplets affect the use, and the breathing performance is poor

[0003] On the other hand, using water glass as the base material and foaming at an appropriate temperature, a porous material with a certain closed porosity can be obtained, but there are disadvantages such as poor stability of the binary system, different cell diameters in the pore structure, and uneven distribution.

Among them, CN102795781A (a low-temperature foam glass insulation material and its preparation method), CN102807326A (a polymer-modified low-temperature foam glass insulation material), CN104310940A (an artificial perlite and puffed product), CN109399942A (a foam glass Ceramic composite building thermal insulation material and its preparation method) etc. have introduced B in water glass successively 2 o 3 , polymer emulsion, Al 2 o 3 , B, Al atoms are embedded in the water glass system to form a multiple network structure, containing boron modifiers, fly ash and other crystal minerals and glass fibers to improve foaming and material durability, but there is still a relatively low expansion ratio in the application process Low, poor material durability and other issues

Among the above several schemes, some use low-temperature foaming, resulting in high residual hydroxyl content in the material, resulting in poor water resistance and other properties, and some adopt high-temperature de-hydroxyl treatment, but the expansion ratio is too low and the bulk density is too large, which is not conducive to actual production and application.

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