Flyash geopolymer based porous material and preparation process thereof

A geopolymer and porous material technology, applied in the field of fly ash geopolymer porous material and its manufacturing process, can solve the problems of high cost of porous materials, low compressive and flexural strength, flammability of thermal insulation materials, etc. Strong freeze-thaw resistance, easy control of foaming conditions, and easy operation

Inactive Publication Date: 2016-07-27
QINGHAI UNIVERSITY +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The purpose of the present invention is to provide a fly ash geopolymer-based porous material to solve the problems of high cost, uneven pore size, easy collapse after foaming, and high energy consumption of existing porous materials
Solve the problems of existing insulation materials such as flammability, short service life, high cost, low compressive and flexural strength, poor high temperature resistance, high water absorption, and high energy consumption

Method used

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  • Flyash geopolymer based porous material and preparation process thereof
  • Flyash geopolymer based porous material and preparation process thereof
  • Flyash geopolymer based porous material and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] 1. Alkali activator: Add 5-10 parts of sodium hydroxide, 5-10 parts of water, 40-60 parts of industrial grade water glass (modulus 2.8-3.2, solid content 25-35%) to the stirrer, modulus adjustment 1.1 ~1.4, make it stir evenly and become a transparent liquid. The stirring head used for the porous material of the fly ash geopolymer, the stirring head is rotated 45 degrees horizontally in the quadrilateral rectangular outer frame 1 o A quadrilateral inner frame 2 fixed to the inner side of the outer frame is installed at the corner, and a rotating shaft 3 is installed on the opposite corner of the quadrangular inner frame, and a shaft hole 4 is arranged on the rotating shaft, and a rectangular outer frame 1 of the stirring head is arranged on the rotating shaft. The shape of "+" is perpendicular to each other 45 o corner installation.

[0050] 2. Pulp making: add a compound activator in the mixer, according to the weight percentage of solid raw materials, then add 100 p...

Embodiment 2

[0057] 1. Alkali activator: add 8 parts of sodium hydroxide, 6 parts of water, 48 parts of industrial grade water glass (modulus 3.0, solid content 34%) to the stirrer, and adjust the modulus to 1.2 to make it stir evenly and become a transparent liquid.

[0058] 2. Pulp making: Add composite activator in the mixer, according to the weight percentage of solid raw materials, then add 100 parts of fly ash, the water-cement ratio is 0.42, and stir for 15 minutes to make it evenly stirred. At this time, the Si / Al molar ratio range: 3.96.

[0059] 3. Foaming: Heat 6 parts of water to 60-80 degrees, dissolve 4 parts of SDS, stir at a speed of 800r / min to form a foam slurry, and the stirring time is about 5 minutes, inject the formed slurry into a plastic mold and cover it Plastic film, cured at a temperature of 40-70 degrees and a humidity of 60-95RH% for 12-48 hours.

[0060] 4. Curing: After demoulding, wrap and cure for 3 days at 20-40 degrees, remove the plastic film, and plac...

Embodiment 3

[0065] 1. Alkali activator: Add 5-10 parts of sodium hydroxide, 10-20 parts of water, 50-70 parts of industrial grade water glass (modulus 2.8-3.2, solid content 25-35%) to the stirrer, modulus adjustment 1.1 ~1.4, make it stir evenly and become a transparent liquid.

[0066] 2. Pulping: add compound activator to the agitator, according to the weight percentage of solid raw materials, then add 60-80 parts of fly ash, 20-40 parts of admixture, water-cement ratio of 0.40-0.6, stir for 5-15 Minutes to make it evenly stirred, the Si / Al molar ratio at this time ranges from 4.0 to 4.2.

[0067] 3. Foaming: Heat 5-15 parts of water to 60-80 degrees, dissolve 3-5 parts of SDS+AES or expired shampoo+SDS+AES mixture, stir at a speed greater than 1000r / min for 10-30 minutes, and dissolve the formed The slurry is injected into a plastic mold and covered with a plastic film, and cured for 12-48 hours at a temperature of 40-80 degrees and a humidity of 60-95RH%.

[0068] 4. Curing: After ...

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Abstract

The invention provides a flyash geopolymer based porous material and a preparation process thereof. The porous material comprises the following components in parts by weight: 60-100 parts of flyash, 40-70 parts of alkali activator, 0-40 parts of admixtures, 0-5 parts of glass fibers, 2-8 parts of physical foaming agents and 0-0.8 part of chemical activators, wherein the alkali activator is alkaline mixed liquor containing various ions and comprises industrial water glass, sodium hydroxide, water, polyethylene glycol and sodium phosphate; the admixtures refer to levigated metakaolin, silicon micropowder and calcined coal gangue; the physical foaming agents include expired shampoo, an anionic surfactant sodium dodecyl sulfate (SDS), fatty alcohol polyoxyethylene ether sodium sulfate (AES) and disodium fatty alcohol polyoxyethylene ether monosulfosuccinate (AESS); the chemical foaming agents include aluminium powder, hydrogen peroxide, and the like. The porous material has adjustable volume density, fine and uniform pore diameter, low heat conductivity, high strength, the same life as buildings and good fireproof performance.

Description

technical field [0001] The invention relates to the technical field of material engineering, in particular to a fly ash geopolymer porous material and a manufacturing process thereof. Background technique [0002] Geopolymer is made of active high-calcium-free or low-calcium aluminum siliceous materials such as kaolin, slag, fly ash, etc. Three-dimensional network gels with state characteristics are collectively referred to as geopolymers. Geopolymer-based porous materials are porous materials prepared by foaming or pore-forming agent methods based on geopolymers. They have large specific surface area, large adsorption capacity, good chemical stability, high hardness, and excellent heat resistance. Low thermal conductivity and many other excellent characteristics. There are 40 billion square meters of existing residential buildings in my country, and 2.5 billion square meters of new buildings are added every year. A building of 1 square meter requires about 1.52 square met...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B7/26
CPCC04B7/243C04B12/005Y02P40/10
Inventor 薛彩红高莉刘海雄李戬汪长安曹长年邢书银马国俊王金辉刘建强马清雷富军张发廷郭彦宏卢海静聂金合侯新刚薛亚军黄陈丹孙丙岩
Owner QINGHAI UNIVERSITY
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