Preparation method of powdery gypsum retarder and product obtained through method

A gypsum retarder, powdery technology, applied in the preparation of gypsum retarder, powdery gypsum retarder, powdery gypsum retarder preparation field, can solve the problem of protein gypsum retarder non-powder, The adaptability of different gypsums is quite different, and it is inconvenient to add dry powder gypsum products to achieve the effect of shortening the difference between initial setting time and final setting time, mild conditions and high adaptability

Active Publication Date: 2018-06-22
广东龙湖科技股份有限公司
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  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Hemihydrate gypsum is usually calcined at high temperature from natural gypsum, desulfurized gypsum, phosphogypsum, etc. Different gypsum sources and calcination processes will lead to large differences in the composition and performance of hemihydrate gypsum, so the adaptability of gypsum retarder High requirements, the traditional gypsum retarder has great differences in the adaptability of different gypsums, and it is used in a large amount in alkaline gypsum-based building materials mixed with cement or lime calcium
In addition, most of the existing gypsum retarders are liquid, so it is not convenient to directly add them to dry powder gypsum products
[0003] The Chinese invention patent with the patent number CN201410215136.4 discloses a preparation method and application of a gypsum retarder. The preparation method of the gypsum retarder is to use a diacid or anhydride to react with an ammonia-containing substance to form an intermediate product. Then add sodium hydroxide solution for hydrolysis, adjust the pH value of the solution with hydrochloric acid, and finally obtain a powdery gypsum retarder through filtration and drying; this preparation method has complex production processes, difficult control of process conditions, and a long period of drying Drying or grinding process to get powder product
The Chinese invention patent with the patent number CN201510162745.2 discloses a gypsum retarder and its preparation method. The preparation method of the gypsum retarder is to use 20-30% animal protein, industrial gelatin, bean protein, fungus Body protein and other protein components are dissolved in 50-65% water, and then 2-3% sodium hydroxide, potassium hydroxide and other alkali substances are added for hydrolysis reaction, and then sodium dihydrogen phosphate, organic acid, sodium benzoate are added in sequence , diisopropylethylamine, form the mixture retarder through the reaction of 5-10h; the reaction time of this preparation method is long, and the obtained protein gypsum retarder is non-powder

Method used

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  • Preparation method of powdery gypsum retarder and product obtained through method
  • Preparation method of powdery gypsum retarder and product obtained through method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] (1) Pretreatment of vegetable protein to form an intermediate product: a. Add 10% sodium hydroxide by weight to 55% tap water to form an alkaline solution; b. Add 28% soybean protein to the above alkali In the neutral solution, heat to 90 ° C, keep the temperature for 30 minutes to obtain the pretreatment solution; c, add 7% calcium sulfate dihydrate to the above pretreatment solution, stir evenly to form an intermediate product;

[0019] (2) Preparation of intermediate product powder: Mix the intermediate product prepared in step (1) with diatomaceous earth at a mass ratio of 3:1, then place it under high-speed stirring and mix evenly to form an intermediate product powder;

[0020] (3) Preparation of gypsum retarder: put the intermediate product powder obtained in step (2) with a weight component of 33%, 65% sodium gluconate, and 2% powdered polycarboxylate superplasticizer in a mixer Stir for 30 minutes to obtain powdered gypsum retarder.

Embodiment 2

[0022] (1) Pretreatment of vegetable protein to form an intermediate product: a. Add 15% sodium hydroxide by weight to 45% tap water to form an alkaline solution; b. Add 30% peanut protein to the above alkali In the neutral solution, heat to 90 ° C, keep the temperature for 30 minutes to obtain the pretreatment solution; c, add 10% calcium sulfate dihydrate to the above pretreatment solution, stir evenly to form an intermediate product;

[0023] (2) Preparation of intermediate product powder: Mix the intermediate product prepared in step (1) with diatomaceous earth at a mass ratio of 3:1, then place it under high-speed stirring and mix evenly to form an intermediate product powder;

[0024] (3) Preparation of gypsum retarder: Put the intermediate product powder obtained in step (2) with 20% by weight component, 79% tartaric acid, and 1% powdered polycarboxylate superplasticizer in a mixer and stir for 30 minutes , to obtain powdered gypsum retarder.

Embodiment 3

[0026] (1) Pretreatment of vegetable protein to form an intermediate product: a. Add 12% sodium hydroxide by weight to 50% tap water to form an alkaline solution; b. Add 35% zein to the above alkali In the neutral solution, heat to 90 ° C, keep the temperature for 30 minutes to obtain the pretreatment solution; c, add 13% calcium sulfate dihydrate to the above pretreatment solution, stir evenly to form an intermediate product;

[0027] (2) Preparation of intermediate product powder: mix the intermediate product prepared in step (1) with precipitated silica at a mass ratio of 2:1, then place it under high-speed stirring and mix evenly to form an intermediate product powder;

[0028] (3) Preparation of gypsum retarder: put the intermediate product powder obtained in step (2) with 40% by weight component, 59% citric acid, and 1% powdered polycarboxylate superplasticizer in a mixer and stir After 30 minutes, the powdered gypsum retarder is obtained.

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Abstract

The invention provides a preparation method of powdery gypsum retarder. The method comprises the steps that vegetable protein is preprocessed with alkali liquor, then accelerant is added, and an intermediate product is obtained, the intermediate product and precipitated silica or kieselguhr are mixed at a high speed according to the weight ratio of (2-3):1, and intermediate product powder is obtained; 18.5%-46.5% by weight of intermediate product powder, 53%-79.5% by weight of powdery organic acid or organic acid salt and 0.5%-2% by weight of powdery water reducing agent are placed in a mixingmachine to be stirred for 30 min, and then the powdery gypsum retarder is obtained. The preparation method is simple in technology and mild in condition, and the powdery product can be obtained directly without the drying and grinding processes. The invention further provides the powdery gypsum retarder obtained through the preparation method, the retarder can improve the stability of gypsum based building material setting time when the gypsum based building material setting time is prolonged, the initial set time and final set time difference is reduced, the construction efficiency is improved, and the adaptability to various kinds of gypsum is high.

Description

technical field [0001] The invention relates to a preparation method of a building material conditioner, in particular to a preparation method of a gypsum retarder which can prolong the setting time of gypsum-based building materials and improve the operation time of gypsum products, and more particularly relates to a powdery gypsum retarder The preparation method of the agent. The present invention also relates to a powdery gypsum retarder obtained by the above preparation method. Background technique [0002] Hemihydrate gypsum is an inorganic cementitious material, which can be used in the production of gypsum blocks, gypsum plastering mortar, gypsum decorative boards, gypsum putty, etc. Gypsum building materials have the characteristics of light weight, small deformation, low production energy consumption, and good dimensional stability , no cracking when dry and harmless to the human body, etc., but the early strength of gypsum materials develops quickly, and the setti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/24C04B103/22
CPCC04B40/0042C04B2103/22C04B24/14C04B22/062C04B22/143C04B22/06C04B24/10C04B2103/302C04B28/14C04B24/06
Inventor 李英丁李恩洪永顺
Owner 广东龙湖科技股份有限公司
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