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Environment-friendly heat-insulating fly ash brick and preparation method thereof

A fly ash brick, an environmentally friendly technology, applied in the field of environmentally friendly and heat-insulating fly ash bricks and its preparation, can solve the problems that the product performance cannot meet the requirements of building functions, low product strength, weak weathering resistance, etc., and achieve excellent natural Effects of cleaning performance, enhanced antifouling performance, and excellent thermal insulation performance

Inactive Publication Date: 2021-11-02
涡阳县晟丰新型建材有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Non-steaming fly ash bricks are naturally cured at room temperature, and steam-cured fly ash bricks are cured by ordinary steam at 90°C to 100°C. Due to the low curing temperature, no matter what the ratio of raw materials is, it is impossible to form relatively high There are many crystallized and complete hydration products, so the product strength is low, the shrinkage value is large, shrinkage cracks are easy to occur, the weather resistance is weak, the durability is poor, and the product performance cannot meet the requirements of building functions; the existing autoclaved fly ash brick It is based on traditional experience, and the ratio design is carried out according to the strength theory. Its molding process is relatively backward, and the curing temperature is still low. A few production plants use 1.0MPa pressure, and the curing temperature is 179 ° C. It is also impossible to produce more favorable The performance of the product is a hydration product with complete crystallization, so the amount of fly ash can not be increased, the drying shrinkage value is still too large, and the durability is not good, which brings many problems to the project quality

Method used

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  • Environment-friendly heat-insulating fly ash brick and preparation method thereof
  • Environment-friendly heat-insulating fly ash brick and preparation method thereof
  • Environment-friendly heat-insulating fly ash brick and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Thermal insulation coatings include the following methods:

[0033] Step S1. Add perfluorohexanoic acid into N,N-dimethylformamide, heat in a water bath at 40°C, stir at a constant speed and add thionyl chloride, stir and react at a constant speed until no gas is generated, terminate the reaction, and stand for separation layer, and distilled under reduced pressure to obtain intermediate 1, controlling the molar ratio of perfluorohexanoic acid and thionyl chloride to be 2:1;

[0034] Step S2, add acrylic acid into a four-necked flask, add ammonium chloride, copper powder and VPO catalyst in sequence, pass nitrogen gas, stir at a constant speed and raise the temperature to 85°C, add propylene oxide dropwise, control the dropping time to 2h, and the reaction ends After steaming excess propylene oxide, remove remaining catalyst, make crude product, underpressure distillation, make intermediate 2, the mol ratio of acrylic acid and propylene oxide is 1: 1.10, and the consump...

Embodiment 2

[0041] Thermal insulation coatings include the following methods:

[0042] Step S1. Add perfluorohexanoic acid into N,N-dimethylformamide, heat in a water bath at 40°C, stir at a constant speed and add thionyl chloride, stir and react at a constant speed until no gas is generated, terminate the reaction, and stand for separation layer, and distilled under reduced pressure to obtain intermediate 1, controlling the molar ratio of perfluorohexanoic acid and thionyl chloride to be 2:1;

[0043]Step S2, add acrylic acid into a four-necked flask, add ammonium chloride, copper powder and VPO catalyst in sequence, pass nitrogen gas, stir at a constant speed and raise the temperature to 85°C, add propylene oxide dropwise, control the dropping time to 2h, and the reaction ends After steaming excess propylene oxide, remove remaining catalyst, make crude product, underpressure distillation, make intermediate 2, the mol ratio of acrylic acid and propylene oxide is 1: 1.12, and the consumpt...

Embodiment 3

[0050] Thermal insulation coatings include the following methods:

[0051] Step S1. Add perfluorohexanoic acid into N,N-dimethylformamide, heat in a water bath at 45°C, stir at a constant speed and add thionyl chloride, stir and react at a constant speed until no gas is generated, terminate the reaction, and stand for separation layer, and distilled under reduced pressure to obtain intermediate 1, controlling the molar ratio of perfluorohexanoic acid and thionyl chloride to be 2:1;

[0052] Step S2, add acrylic acid into a four-necked flask, add ammonium chloride, copper powder and VPO catalyst in sequence, pass nitrogen gas, stir at a constant speed and raise the temperature to 85°C, add propylene oxide dropwise, control the dropping time to 2h, and the reaction ends After steaming excess propylene oxide, remove remaining catalyst, make crude product, underpressure distillation, make intermediate 2, the mol ratio of acrylic acid and propylene oxide is 1: 1.14, and the consump...

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Abstract

The invention discloses an environment-friendly heat-insulating fly ash brick and a preparation method thereof. The preparation method comprises the following steps: mixing and grinding 20-25 parts by weight of fly ash, 25-30 parts by weight of furnace slag and 2.5-3.5 parts by weight of bauxite to prepare a mixture, then adding 2-5 parts by weight of phosphogypsum and 0.1-0.3 part by weight of calcium lignosulphonate, adding water, continuously conducting mixing and grinding, and then carrying out static compression molding to prepare a green body; carrying out constant-temperature and constant-pressure autoclaving on the green body to prepare a fly ash brick body; preparing a heat insulation coating; and coating the surface of a fly ash brick body with the heat insulation coating, and controlling the coating thickness to range from 0.5 mm to 2 mm, so as to obtain the environment-friendly heat insulation fly ash brick. Matrix resin is prepared from an intermediate 3, and the side chain of the prepared matrix resin contains fluorine-containing groups, is arranged outwards and does not contain polar groups, so that the matrix resin has excellent hydrophobicity, is endowed with excellent self-cleaning performance and is not easily adhered by dirt, and the antifouling property of the matrix resin is further enhanced.

Description

technical field [0001] The invention relates to the technical field of heat-insulating bricks, in particular to an environment-friendly heat-insulating fly ash brick and a preparation method thereof. Background technique [0002] At present, in the field of building materials, there are three types of non-sintered fly ash brick production technologies: non-steamed fly ash bricks, steam-cured fly ash bricks and autoclaved fly ash bricks. Non-steaming fly ash bricks are naturally cured at room temperature, and steam-cured fly ash bricks are cured by ordinary steam at 90°C to 100°C. Due to the low curing temperature, no matter what the ratio of raw materials is, it is impossible to form relatively high There are many crystallized and complete hydration products, so the product strength is low, the shrinkage value is large, shrinkage cracks are easy to occur, the weather resistance is weak, the durability is poor, and the product performance cannot meet the requirements of build...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B28/14C04B41/87
Inventor 孙伟
Owner 涡阳县晟丰新型建材有限公司
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