Preparation method of durability-enhanced alkali-free liquid accelerator

An enhanced and durable technology, applied in the field of building materials, can solve the problems of poor impermeability of hardened concrete, unstable concrete quality, and serious injuries to construction personnel, and achieve the effect of improving the later strength, inhibiting the generation of precipitation, and promoting development

Active Publication Date: 2018-11-13
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The liquid accelerators currently used in China have problems such as high alkali content, large strength loss in the later stage, and poor impermeability of hardened concrete.
High alkali content will cause serious environmental pollution, great harm to construction personnel, and unstable concrete quality. In order to improve the damage of accelerators to constructors and concrete quality, it is of great importance to develop a durable non-alkali liquid accelerator. the meaning of

Method used

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  • Preparation method of durability-enhanced alkali-free liquid accelerator
  • Preparation method of durability-enhanced alkali-free liquid accelerator
  • Preparation method of durability-enhanced alkali-free liquid accelerator

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Acylation reaction: first add 100.00g maleic anhydride and 66.00g urea to the reaction device, under the protection of nitrogen, heat up to 60°C, add 0.60g p-toluenesulfonic acid, slowly heat up to 85°C, keep the temperature for 1.0h, Cool down to obtain acylated product;

[0024] (2) Preparation of suspension stabilizer: 100.00g acylated product, acrylamide aqueous solution (wherein acrylic acid 120.00g and water 150.00g), acrylic acid aqueous solution (wherein acrylic acid 32.00g and water 150.00g), ammonium persulfate aqueous solution (wherein Ammonium sulfate 2.30g and water 150.00g) and thioglycolic acid aqueous solution (wherein thioglycolic acid 1.50g and water 150.00g), drop into 500.00g water and react, the reaction temperature is 80 ℃, the time of dropping is 2.0h, and the insulation is 1.0h, Suspension stabilizer;

[0025] (3) Preparation of enhancer: react 105.00g of diethanolamine and 90.00g of oxalic acid at a reaction temperature of 66°C, then add 1....

Embodiment 2

[0028] (1) Acylation reaction: first add 100.00g maleic anhydride and 71.00g urea to the reaction device, under the protection of nitrogen, raise the temperature to 60°C, add 0.80g concentrated sulfuric acid, slowly raise the temperature to 75°C, keep the temperature for 2.0h, and cool down to obtain Acylation products;

[0029] (2) Preparation of suspension stabilizer: 100.00g acylated product, acrylamide aqueous solution (wherein acrylic acid 142.00g and water 150.00g), acrylic acid aqueous solution (wherein acrylic acid 36.00g and water 150.00g), ammonium persulfate aqueous solution (wherein Ammonium sulfate 1.70g and water 150.00g) and mercaptopropionic acid aqueous solution (wherein mercaptopropionic acid 1.70g and water 150.00g), drop into 500.00g water to react, the reaction temperature is 70 ℃, the time of dropping is 3.0h, and the insulation time is 2.0 h, to obtain a suspension stabilizer;

[0030] (3) Preparation of enhancer: react 61.00g of monoethanolamine and 90...

Embodiment 3

[0033] (1) Acylation reaction: first add 100.00g maleic anhydride and 68.00g urea to the reaction device, under the protection of nitrogen, raise the temperature to 60°C, add 0.70g concentrated sulfuric acid, slowly raise the temperature to 80°C, keep the temperature for 3.5h, and cool down to obtain Acylation products;

[0034] (2) Preparation of suspension stabilizer: 100.00g acylated product, acrylamide aqueous solution (wherein acrylic acid 155.00g and water 150.00g), acrylic acid aqueous solution (wherein acrylic acid 38.00g and water 150.00g), ammonium persulfate aqueous solution (wherein Ammonium sulfate 2.80g and water 150.00g) and mercaptoethanol aqueous solution (wherein mercaptoethanol 3.00g and water 150.00g), drop into 520.00g water and react, the reaction temperature is 80 ℃, the time for dropping is 2.0h, and the insulation is 3.0h, Suspension stabilizer;

[0035] (3) Preparation of enhancer: react 149.00g of triethanolamine and 90.00g of oxalic acid at a react...

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Abstract

The invention discloses a preparation method of a durability-enhanced alkali-free liquid accelerator. According to the preparation method, maleic anhydride and urea are acylated to prepare an acylatedproduct, then the acylated product is subjected to copolymerization with acrylamide and acrylic acid to prepare a suspension stabilizer, and the suspension stabilizer is used for the preparation of the alkali-free liquid accelerator. By introducing the suspension stabilizer with an amide structure, which is prepared through the acylation of the maleic anhydride and the urea, the cohesiveness of the liquid accelerator is improved, the generation of precipitation is effectively inhibited, the stability of mother liquor storage is greatly improved, and the stability can reach 15 months or more than 15 months; and the amide structure and the urea can promote the development of early strength, so that the early strength of concrete can be improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a preparation method of a durability-enhanced alkali-free liquid quick-setting agent. Background technique [0002] With the acceleration of large-scale mining, tunnel excavation, and road network and railway network construction, the amount of accelerators has greatly increased, and higher requirements have been placed on the performance and quality of accelerators. Traditional powder accelerator products can only be applied to dry spraying process construction, and there are defects such as slow dissolution rate and difficult dispersion evenly. [0003] At present, the development trend of accelerators for shotcrete is changing from traditional solid powder to liquid, and low-alkali and non-alkali are gradually replacing traditional accelerators. The liquid accelerators currently used in China have problems such as high alkali content, large strength los...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/20C04B103/12
CPCC04B40/0039C04B2103/12C04B24/124C04B24/04C04B24/20C04B24/026C04B22/06C04B22/147
Inventor 郭鑫祺官梦芹蒋卓君李祥河陈晓彬林添兴郭元强麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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