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

A foam glass and vacuum foaming technology, applied in glass manufacturing equipment, glass molding, manufacturing tools, etc., can solve the problems of high closed porosity of foam glass, poor stability of binary system, poor water resistance and other problems, and achieve Improve stability and mechanical properties, reduce hydroxyl content, and increase expansion ratio

Active Publication Date: 2021-01-19
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

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.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046] The experiment was carried out with liquid sodium silicate water glass, boric acid and calcium-based bentonite with a modulus of 2.4 and a solid content of 48.95%. The chemical composition and content of the calcium-based bentonite used are shown in Table 1-1; the parameters of the sodium silicate used are shown in Table 1-2.

[0047] Table 1-1 Chemical composition and content of calcium-based bentonite

[0048] chemical composition SiO 2

al 2 o 3

Fe 2 o 3

FeO TiO CaO MgO MnO K 2 o

Na 2 o

Content (wt%) 65.04 16.08 1.12 0.20 0.27 5.01 2.13 0.29 1.00 0.27

[0049] Table 1-2 Parameters of sodium water glass

[0050]

[0051] Table 1-3 Experimental formula

[0052]

[0053] The raw materials were sheared at high speed for 30 minutes, dispersed and mixed evenly, and a mixed sol was obtained without gelling. Put the mixed sol into an oven at 110°C for about 24 hours to obtain an intermediate mat...

Embodiment 2

[0081] Figure 4 It is a comparison chart of the measurement data of the samples obtained by incubating at different temperatures with the formula raw materials in Example 1 under the environment of full vacuum but different relative vacuum degrees.

[0082] according to Figure 4 It can be seen that changing the relative vacuum degree of the vacuum environment has a significant impact on the durability of the material. Under the same conditions of other heat treatment, the greater the negative pressure, the lower the residual hydroxyl content of the prepared material. For example, for the three samples obtained at 350°C, the weight loss rate of the sample prepared by negative pressure 0.1MPa is close to 0, and the negative pressure 0.01MPa The weight loss rate of the prepared samples is close to 1.

Embodiment 3

[0084] The open porosity of the material is an important index to characterize the pore structure of the material, and the present invention mainly regulates the pore structure by changing the introduction stage of the vacuum environment.

[0085] Using the formulation raw materials in Example 1, the raw materials were sheared at high speed for 30 minutes, dispersed and mixed evenly, and a mixed sol was obtained without gelling. Put the mixed sol into an oven at 110°C for about 24 hours to obtain an intermediate material with a certain moisture content.

[0086] (1) After the intermediate pellets are moved into the tube furnace, the negative pressure in the furnace is 0.1Mpa and the temperature rises. When it reaches 100°C, 200°C, 300°C, and 350°C, quickly open the valve to let the air enter the tube furnace, wait for 15 seconds, and then quickly evacuate After the negative pressure in the tube reaches 0.1Mpa, continue to heat up to 350°C and immediately cool down with the fur...

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C03C11/00C03B19/08
CPCC03B19/08C03C11/007
Inventor 王智宇高嘉阳
Owner ZHEJIANG UNIV
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