Method for preparing sintering-free geopolymer foam ceramics

A foamed ceramic and geopolymer technology is applied in the field of preparation of sinter-free geopolymer foamed ceramic thermal insulation materials, which can solve the problems of potential safety hazards, poor fire resistance, fire, etc., and achieve comprehensive utilization, long service life, Good fire resistance

Inactive Publication Date: 2014-03-19
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Organic foam insulation material has the advantages of light weight and good insulation effect, but because it is an organic component, it has low strength,

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0015] Example 1:

Example Embodiment

[0016] This implementation case includes the following steps:

[0017] (1) Wash the ordinary waste ceramic pieces and dry them in a ball mill for 20-30 minutes. The finely ground waste ceramic powder can pass through a 100-mesh sieve;

[0018] (2) Add 100 parts by weight of waste ceramic powder, 55 parts by weight of sodium silicate with 1.2 modulus of alkali activator, and 1.5 parts by weight of aluminum powder foaming agent into the concrete mixing pot and mix well;

[0019] (3) Pour the evenly stirred slurry into the mold, and then put it in a 60±5℃, 99% relative humidity concrete curing box for curing, and demoulding after 24 hours. Then put it in the curing box and cure for 28 days to get foam ceramics;

[0020] (4) After curing for 28 days, the density of the foam ceramics prepared is 436kg / m 3 , Compressive strength 14.37MPa, flexural strength 2.9Mpa, thermal conductivity 0.15w / (m·k).

Example Embodiment

[0021] Example 2:

[0022] This implementation case includes the following steps:

[0023] (1) Wash the ordinary waste ceramic pieces and dry them in a ball mill for 20-30 minutes. The finely ground waste ceramic powder can pass through a 100-mesh sieve;

[0024] (2) Add 100 parts by weight of waste ceramic powder, 60 parts by weight of potassium silicate with 2.0 modulus of alkali activator, and 2 parts by weight of aluminum powder foaming agent into the concrete mixing pot and mix well;

[0025] (3) Pour the evenly stirred slurry into the mold, and then put it in a 60±5℃, 99% relative humidity concrete curing box for curing, and demoulding after 24 hours. Then put it into the curing box to cure for 28 days to get foam ceramics.

[0026] (4) After 28 days of curing, the density of the foam ceramics prepared is 462kg / m 3 , Compressive strength 12.37MPa, flexural strength 3.36MPa, thermal conductivity 0.16w / (m·k).

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PUM

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Abstract

The invention discloses a method for preparing sintering-free geopolymer foam ceramics. The method comprises the steps of firstly grinding waste/old ceramics into powder, then, uniformly mixing and stirring 100 parts by weight of ceramic powder, 30-60 parts by weight of alkaline activator and 1-5 parts by weight of foamer, pouring a mixture into a mold, curing for 24 hours in a concrete curing box at the temperature of 60 DEG C, then, demolding, and continuously curing for 28 days, thereby obtaining the sintering-free geopolymer foam ceramics. According to the method disclosed by the invention, a high-temperature (1,300 DEG C) and high-energy-consumption sintering process of the general ceramic foam preparation processes is not required, and complicated processes, such as dipping and the like, are also not required, so that the method is energy-saving, low-carbon and environmental-friendly; the geopolymer foam ceramics are prepared by adopting an alkali activating principle, and the interior of the geopolymer foam ceramics contains a great deal of amorphous three-dimensional reticular structures, so that the material has the characteristics of low heat conductivity, good heat insulating property, good fire resistance, long service life, good ageing resistance and the like; the material is an inorganic material, so that the fatal defects of flammability and combustibility of organic heat insulating materials are overcome.

Description

technical field [0001] The invention relates to building exterior wall insulation materials, in particular to a preparation method of a non-sintering-free polymer foam ceramic insulation material, which is a technology of grinding recycled waste ceramics into powder and then using an alkali excitation method to prepare foam ceramics. Background technique [0002] The current building exterior wall insulation materials are mainly organic materials, namely polystyrene foam insulation boards, polyurethane foam insulation boards, etc. Organic foam insulation material has the advantages of light weight and good insulation effect, but because it is an organic component, it has low strength, is easy to age, is easy to burn, has poor fire resistance, can cause fire, and has potential safety hazards. Good thermal insulation material is imperative. The development of foam ceramics began in the 1970s and is a porous material with high temperature resistance. Due to the stable physica...

Claims

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Application Information

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IPC IPC(8): C04B38/02
Inventor 李琴徐燕崔皓安浩邓晔文翟建平
Owner NANJING UNIV
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