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A kind of water-retaining polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete additives, can solve the problems of concrete loss, achieve stable fluidity, high water retention, and improve hysteresis bleeding

Active Publication Date: 2021-10-08
SHAANXI KZJ NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] CN109679108A ​​adopts the synthesis method of grafting esterification after polymerization first, and introduces polyhydroxy glucose with excellent water retention performance for graft esterification. The polycarboxylate water reducing agent prepared by this method has better water retention, but the concrete loss is faster

Method used

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  • A kind of water-retaining polycarboxylate superplasticizer and preparation method thereof
  • A kind of water-retaining polycarboxylate superplasticizer and preparation method thereof
  • A kind of water-retaining polycarboxylate superplasticizer and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0037] (1) Acylation reaction: 72.0g maleic anhydride, 112.0g compound A, under the protection of nitrogen, after adding 1.2g p-toluenesulfonic acid, slowly raise the temperature to 65°C, keep the temperature for 6h, cool down to obtain acylation product and unreacted The first mixture of unsaturated anhydrides.

[0038] (2) Copolymerization reaction: the first mixture of 10.0g, 12.0g acrylic acid, 100.0g unsaturated polyether B, 5.0g unsaturated carboxylate C1, 10.0g monomer D, 1.50g hydrogen peroxide, 1.50g persulfuric acid Ammonium and 80.0g deionized water were added to the reaction vessel and mixed, and the reducing agent solution (0.16g 2-hydroxy-2 sulfinic acid, 0.35g ascorbic acid, 20.0g deionized water), mercaptopropanol aqueous solution (wherein 1.40g iso propanol, water 20.0g) were dripped into the reaction vessel respectively to carry out normal temperature reaction, the dripping time was 3h, and the insulation was kept for 2h after the dripping was completed.

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Embodiment 2

[0041] (1) Acylation reaction: 86.0g itaconic anhydride, 66.1g compound A, under the protection of nitrogen, after adding 1.3g ethanesulfonic acid, slowly raise the temperature to 70°C, keep the temperature for 5h, and cool down at the end of the reaction to obtain the acylated product and A first mixture of unreacted unsaturated anhydrides.

[0042] (2) Copolymerization reaction: 20.0g of the first mixture, 6.2g of acrylic acid, 100.0g of unsaturated polyether monomer B, 8.0g of unsaturated carboxylate C2, 15.0g of monomer D, 2.00g of hydrogen peroxide, and 1.00g of persulfate Ammonium, 80.0g deionized water were added in the reaction vessel and mixed, and the reducing agent solution (0.20g 2-hydroxyl-2 sulfinic acid, 0.45g ascorbic acid, 20.0g deionized water), the molecular weight regulator solution (thioglycolic acid aqueous solution ( Wherein 0.64g of mercaptoacetic acid and 20.0g of water)) were dripped into the reaction vessel respectively to carry out the reaction at n...

Embodiment 3

[0045] (1) Acylation reaction: 68.0g succinic anhydride, 78.0g compound A, under the protection of nitrogen, after adding 1.8g ethanesulfonic acid, slowly raise the temperature to 80°C, keep the temperature for 3h, and cool down at the end of the reaction to obtain the acylated esterification product and the first mixture of unreacted unsaturated anhydride.

[0046](2) Copolymerization reaction: 15.0g of the first mixture, 8.0g of acrylic acid, 100.0g of unsaturated polyether monomer B, 5.0g of unsaturated carboxylate C1, 5.0g of unsaturated carboxylate C2, and 5.0g of monomer D , 1.80g hydrogen peroxide, 0.85g ammonium persulfate, and 80.0g deionized water were added to the reaction vessel and mixed, and the reducing agent solution (0.26g 2-hydroxyl-2 sulfinic acid, 0.40g ascorbic acid, 20.0g deionized water), An aqueous solution of mercaptopropionic acid (wherein, 0.80 g of mercaptopropionic acid and 20.0 g of water) was dropped into the reaction vessel respectively to carry...

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Abstract

The invention relates to the technical field of concrete additives in building materials, in particular to a water-retaining polycarboxylate water reducer and a preparation method thereof. The preparation method comprises the following steps: adding the first mixture, an unsaturated polyether monomer with a molecular weight of 2400, acrylic acid, an unsaturated carboxylate, monomer D, an oxidizing agent, and deionized water into a reaction vessel and mixing them, and mixing the reducing agent with Molecular weight regulator solutions were added to the reaction container for reaction at room temperature, and after a period of heat preservation, the pH value of the obtained product was adjusted to 6-7 to obtain the polycarboxylate water reducer; the first mixture included ring, amides, acylated products of sulfonamides and unsaturated acid anhydrides; the monomer D is triethylene glycol methyl ether methacrylate. The water reducing agent prepared by the preparation method of the present invention has high water retention, can effectively lock the moisture in the concrete, control the hydrolysis speed of the ester group and the amide group, effectively improve the hysteresis bleeding phenomenon, and the concrete fluidity is stable.

Description

technical field [0001] The invention relates to the technical field of concrete additives in building materials, in particular to a water-retaining polycarboxylate water reducer and a preparation method thereof. Background technique [0002] As a chemical admixture, polycarboxylate high-performance water-reducer has become an indispensable part of the preparation of high-performance concrete, and is also one of the important measures to achieve high-performance and green concrete materials. It can control the water consumption of concrete to the greatest extent, improve the durability of concrete, shorten the setting time, and improve the slump loss of ordinary concrete. However, with the increasing number of infrastructure projects, the cement, sand, and stone materials on the market are becoming more and more complex. At present, the sand and stone used in commercial concrete have high mud content. Quality fluctuations are very sensitive, especially in low-temperature con...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F222/38C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F222/385C04B24/16C04B24/26C08F220/20C08F222/38C08F283/06
Inventor 赖华珍方云辉柯余良林艳梅赖广兴杨浩刘博博麻秀星郭元强林添兴
Owner SHAANXI KZJ NEW MATERIALS