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A kind of water reducing agent and preparation method thereof

A technology of water reducing agent and mixing water, which is applied in the field of water reducing agent and its preparation, which can solve the problems of poor adaptability, formaldehyde generation, and low sensitivity, and achieve excellent slump retention performance, strong mud resistance, and low sensitivity Effect

Active Publication Date: 2022-05-17
ZHEJIANG KZJ NEW MATERIALS CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] At present, the naphthalene-based aliphatic high-efficiency superplasticizers on the market are widely used in general commercial and civil buildings because of their good adaptability and low sensitivity. The development direction of environmental protection
[0003] Therefore, polycarboxylate superplasticizers with green and environmental protection properties have been rapidly developed in the market. However, with the vigorous development of my country's infrastructure, building sand, aggregates and adhesive resources are increasingly scarce, making it used for the preparation of concrete. The properties of construction sandstone, aggregate and adhesive materials are also good and bad, and are extremely unstable; to ensure that the construction performance of concrete is stable during construction, when adding polycarboxylate superplasticizer to concrete, polycarboxylate superplasticizer The dosage of carboxylic acid superplasticizer should also be adjusted according to the performance fluctuations of construction sand, aggregate and adhesive materials. However, the change of the dosage of polycarboxylate superplasticizer in concrete will also cause The performance of the agent is affected, so that the construction performance of the concrete is affected. In other words, the polycarboxylate superplasticizer has high sensitivity to the dosage and poor adaptability

Method used

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  • A kind of water reducing agent and preparation method thereof
  • A kind of water reducing agent and preparation method thereof
  • A kind of water reducing agent and preparation method thereof

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preparation example Construction

[0046] The present invention also provides a method for preparing a water reducing agent. In parts by weight, the preparation of the water reducing agent includes the following steps:

[0047] Add 100 to 200 parts of aminonaphthalene disulfonic acid maleamide esterification monomer and 200 parts of mixing water into the first reaction vessel, stir and dissolve, and raise and maintain the temperature in the first reaction vessel to 60°C to 90°C °C; and add the first mixed solution and the second mixed solution to the first reaction container, and continue to react for 0.5h to 2h to obtain the water reducing agent;

[0048] Wherein, the first mixed solution is 1 to 10 parts of initiator and 50 parts of mixing water;

[0049] The second mixed solution is 0.5-10 parts of chain transfer agent, 0.2-2 parts of reducing agent and 50 parts of mixing water.

[0050] The preparation method of the water reducer provided by the present invention, compared with the prior art, in the presen...

Embodiment 1

[0072] (1) Preparation of aminonaphthalene disulfonic acid maleamide esterification monomer:

[0073] In parts by weight, add 300 parts of 7-amino-1,3-naphthalene disulfonic acid, 100 parts of maleic anhydride, 0.5 parts of p-toluenesulfonic acid and 500 parts of water into the second reaction vessel, heat to 95°C, React at this temperature for 8 hours. After the reaction, cool down to obtain the maleamide esterified monomer of aminonaphthalene disulfonic acid;

[0074] (2) Preparation of water reducing agent:

[0075] In parts by weight, add 200 parts of aminonaphthalene disulfonic acid maleamide esterification monomer and 200 parts of mixing water into the first reaction container, stir and dissolve, and raise and maintain the temperature in the first reaction container At 70°C; then add the first mixed solution and the second mixed solution dropwise to the first reaction container at the same time, and after 2.5 hours of dropwise addition, continue to react for 1 hour, aft...

Embodiment 2

[0079] (1) Preparation of aminonaphthalene disulfonic acid maleamide esterification monomer:

[0080] In parts by weight, add 300 parts of 6-amino-1,3-naphthalene disulfonic acid, 110 parts of maleic anhydride, 0.5 parts of p-toluenesulfonic acid and 500 parts of water into the second reaction vessel, heat to 95°C, React at this temperature for 8 hours. After the reaction, cool down to obtain the maleamide esterified monomer of aminonaphthalene disulfonic acid;

[0081] (2) Preparation of water reducing agent:

[0082] In parts by weight, add 200 parts of aminonaphthalene disulfonic acid maleamide esterification monomer and 200 parts of mixing water into the first reaction vessel, heat and stir to dissolve, and keep the temperature in the first reaction vessel at 70 ℃; then add the first mixed solution and the second mixed solution dropwise to the first reaction container at the same time, after the dropwise addition, continue to react for 1h, after the reaction is completed,...

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Abstract

The invention provides a polycarboxylate water reducer, which comprises, in parts by weight: aminonaphthalene disulfonic acid maleamide esterified monomer: 100-200 parts; initiator: 1-10 parts; chain transfer agent : 0.5-10 parts; reducing agent: 0.2-2 parts; mixing water: 300 parts. In the water reducer provided in the present invention, the water reducer obtained by free radical copolymerization of the above components has a carbon-carbon chain as the main chain, and naphthalene sulfonic acid groups are grafted as branch chains and anchor groups, so that the water reducer has multiple structures. Variability and designability. The water reducing agent of the present invention does not produce formaldehyde and can achieve the effect of environmental protection. At the same time, the water reducing agent of the present invention has the characteristics of low sensitivity, good adaptability, good dispersibility, excellent slump retention performance and strong mud resistance. Advantages, it can adapt to fluctuations in the performance of construction sand, aggregate and adhesive materials.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a water reducer and a preparation method thereof. Background technique [0002] At present, the naphthalene-based aliphatic high-efficiency superplasticizers on the market are widely used in general commercial and civil buildings because of their good adaptability and low sensitivity. The development direction of environmental protection. [0003] Therefore, polycarboxylate superplasticizers with green and environmental protection properties have been rapidly developed in the market. However, with the vigorous development of my country's infrastructure, building sand, aggregates and adhesive resources are increasingly scarce, making it used for the preparation of concrete. The properties of construction sandstone, aggregate and adhesive materials are also good and bad, and are extremely unstable; to ensure that the construction performance of concrete is stable during...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F122/24C04B24/16C04B103/30
CPCY02W30/91
Inventor 曾贤华朱巧勇黄文耀徐逸丹凤熊浩男朱艳姣于飞宇
Owner ZHEJIANG KZJ NEW MATERIALS CO LTD
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