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Early-strength polycarboxylate water-reducing agent with slump-preserving function and preparation method thereof

An early-strength polycarboxylate technology, which is applied in the field of early-strength polycarboxylate water reducer and its preparation, can solve the problems of poor slump retention and other problems, and achieve the improvement of dissolution rate and diffusion rate. Effect

Active Publication Date: 2020-07-14
SHENZHEN MAIDI CONCRETE ADDITIVES
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] In order to overcome the problem of poor slump retention of the current early-strength polycarboxylate water-reducer, the present invention provides an early-strength polycarboxylate water-reducer with a slump-preserving function and a preparation method thereof

Method used

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  • Early-strength polycarboxylate water-reducing agent with slump-preserving function and preparation method thereof
  • Early-strength polycarboxylate water-reducing agent with slump-preserving function and preparation method thereof
  • Early-strength polycarboxylate water-reducing agent with slump-preserving function and preparation method thereof

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preparation example Construction

[0046] The preparation method of monomer c is as follows:

[0047] Mix one of acrylic acid, methacrylic acid, maleic anhydride or fumaric anhydride with tetrahydroxyethylethylenediamine at a molar ratio of 1:1, and add 0.001- Stir uniformly with 0.010% polymerization inhibitor and 0.005%-0.05% catalyst, slowly raise the temperature to 95-105° C. under the condition of feeding nitrogen, and stir for 5-7 hours to obtain monomer c.

[0048] Wherein, the consumption of polymerization inhibitor in the synthesized monomer c can also be 0.003%-0.008%, can further be 0.003%-0.005%, 0.005%-0.008%; The consumption of catalyst can also be 0.01%-0.03%, It can further be 0.01%-0.02%, 0.02%-0.03%.

[0049] In the process of synthesizing monomer c, after adding nitrogen gas, the temperature is slowly raised to the optimal temperature of 95°C, 98°C, 100°C, 102°C, 105°C, the optimal temperature is 100°C, and the optimal stirring time is 5-7h. It can be 5-6h, and the optimal stirring time is ...

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Abstract

The invention discloses an early-strength polycarboxylate superplasticizer having a slump-loss prevention function and a preparation method of the polycarboxylate superplasticizer. The polycarboxylate superplasticizer is prepared through the following steps: (I) copolymerizing 5-12% of a monomer a, 73-89% of a modified low-foam early-strength polyether monomer b with the molecular weight (M) in a range of 2000-5000, and 6-15% of a monomer c in an aqueous solution at 50-70 DEG C to obtain a copolymerization reactant, wherein the total amount of the monomer a, the monomer b, and the monomer c is 100% by weight; and (II) adding a pH value conditioning agent into the copolymer for a neutralization reaction, wherein the pH value of the copolymer is adjusted to 6.8-7.2. According to the invention, the early-strength polycarboxylate superplasticizer having a slump-loss prevention function enables the fluidity of cement paste of concrete to be well kept. The concrete is low in air content and short in setting time, and the early-strength of the concrete is significantly enhanced. The polycarboxylate superplasticizer enables the concrete to have certain slump maintenance, and is particularly suitable for production of a prefabricated component of a pile tube or duct piece.

Description

【Technical field】 [0001] The invention relates to a water reducer, in particular to an early-strength polycarboxylate water reducer with a slump-preserving function and a preparation method thereof. 【Background technique】 [0002] With the rapid development of social economy and the rise of large-scale infrastructure such as nuclear power, water conservancy, bridges, and tunnels, higher requirements are placed on the performance of concrete admixtures. Concrete admixtures are mainly used to improve the performance of concrete, such as improving the fluidity of fresh concrete, reducing the loss of slump, etc.; can improve the workability of concrete, such as no segregation, no bleeding, etc.; can also adjust the cement Hydration, hardening process, so that it advances or delays hydration condensation, etc. [0003] As a representative of a new generation of high-performance superplasticizers, polycarboxylate superplasticizers have been widely used, but ordinary polycarboxyla...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/36C08F222/02C08F2/38C04B24/26C04B103/30
Inventor 陈炜安陈伟国蔡心映柴鑫锋
Owner SHENZHEN MAIDI CONCRETE ADDITIVES
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