Building gypsum retarder and preparation method thereof

A gypsum retarder and construction gypsum technology, which is applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of large loss of construction gypsum strength, and achieve the reduction of retarding effect, energy saving and The effect of low resource and production costs

Active Publication Date: 2022-08-02
HEBEI CHEM & PHARMA COLLEGE
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above problems, the present invention provides a building gypsum retarder and a preparation method thereof. The building gypsum retarder is made of furfural slag as the main raw material, which can maintain good retardation for building gypsum under neutral and alkaline conditions. It solves the problem of large loss of building gypsum strength caused by commonly used retarders

Method used

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  • Building gypsum retarder and preparation method thereof

Examples

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Comparison scheme
Effect test

Embodiment 1

[0016] Dissolve 1 part of sodium hydroxide in water, add 30 parts of furfural residue to soak for 20 minutes; heat up to 78°C, add 5 parts of calcium β-hydroxy-β-methylbutyrate and stir for 60 minutes, then add 3 parts of calcium propionate and 0.5 part of calcium propionate. The tertiary ethylene carbonate continued to react for 6 min; after cooling, the powdery gypsum retarder was obtained by filtration and drying. Test the setting time and strength of desulfurized plaster of Paris according to "Gypsum of Building GBT9776-2008".

Embodiment 2

[0018] Dissolve 4 parts of sodium oxide in water, add 45 parts of furfural residue and soak for 30 minutes; heat up to 70°C, add 12 parts of calcium β-hydroxy-β-methylbutyrate and stir for 30 minutes, then add 8 parts of calcium propionate and 3 parts of tertiary Ethylene carbonate continued to react for 2 min; after cooling, the powdery gypsum retarder was obtained by filtration and drying. Test the setting time and strength of desulfurized plaster of Paris according to "Gypsum of Building GBT9776-2008".

Embodiment 3

[0020] Dissolve 5 parts of potassium hydroxide in water, add 50 parts of furfural residue and soak for 10 minutes; heat up to 85°C, add 15 parts of calcium β-hydroxy-β-methylbutyrate and stir for 70 minutes, then add 5 parts of calcium propionate and 2.5 parts of calcium propionate. The tertiary ethylene carbonate continued to react for 10 minutes; after cooling, the powdery gypsum retarder was obtained by filtration and drying. Test the setting time and strength of desulfurized plaster of Paris according to "Gypsum of Building GBT9776-2008".

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Abstract

The preparation method specifically comprises the following steps: dissolving 3-4 parts of alkali in water, adding 30-50 parts of furfural residues, and soaking for 5-40 minutes; heating to 70-85 DEG C, adding 5-15 parts of calcium beta-hydroxy-beta-methyl butyrate, stirring to react for 30-70 minutes, then adding 1-8 parts of calcium propionate and 0.5-3 parts of vinyl versatate, continuing to react for 2-10 minutes, cooling, and filtering to obtain the gypsum retarder. The retarder prepared by taking the furfural residues as the main raw material can keep a good retarding effect on the building gypsum under neutral and alkaline conditions, has small influence on the strength of the building gypsum, and solves the problems that the retarding effect of a common retarder is reduced under the alkaline condition and the strength loss of the building gypsum is large.

Description

technical field [0001] The invention relates to a building gypsum retarder and a preparation method, in particular to a building gypsum set retarder using furfural slag as a raw material and a preparation method. Background technique [0002] Furfural residue is a biomass by-product produced by the hydrolysis of polypentose in biomass such as corn cob, corn stalk, wheat straw, peanut husk, rice husk, cottonseed husk, bagasse and waste wood to synthesize furfural (furfural). product. In the process of furfural production, the dense structure of biomass raw materials is destroyed, the hemicellulose components in the raw materials are catalytically converted into furfural, and most of the cellulose and lignin components remain to form furfural residues. Since the yield of furfural produced by existing industrial methods is still low, generally about 50%, 12 to 15 tons of furfural residues will be produced for every 1 ton of furfural obtained. Therefore, millions of tons of fur...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/06C04B103/22
CPCC04B40/0039C04B2103/22C04B18/24C04B24/06C04B24/04C04B24/045C04B22/062Y02W30/91
Inventor 黄永茂
Owner HEBEI CHEM & PHARMA COLLEGE
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