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A slow-release polycarboxylate superplasticizer

A technology of slow-release polycarboxylic acid and water reducing agent, which is applied in the field of construction engineering, can solve the problems of cost increase and cumbersome operation, and achieve the effect of long-term adjustment of concrete performance

Active Publication Date: 2022-06-17
桐庐宏基源混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The present invention provides a slow-release polycarboxylate superplasticizer to overcome the defects that the polycarboxylate superplasticizer in the prior art is sensitive to fluctuations in the quality of concrete raw materials, resulting in cumbersome operations and increased costs.

Method used

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  • A slow-release polycarboxylate superplasticizer

Examples

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Effect test

Embodiment 1

[0025] A sustained-release polycarboxylate water-reducing agent, comprising a main chain alternately combined with organosilicon units and polyether units, wherein the side chains of the organosilicon units contain silane-terminated acrylate structural units.

[0026] The preparation method of the slow-release polycarboxylate water-reducing agent is as follows:

[0027] (S.1) Synthesis of acrylate structural unit: under nitrogen protection, dissolve 0.1 mol of hydroxyethyl acrylate and 0.1 mol of triethylamine in 200 ml of dichloromethane, and place it in a three-necked flask, and then add 0.1 mol of Trimethylchlorosilane was dissolved in 100ml of dichloromethane and added to the constant pressure dropping funnel. The solution in the constant pressure dropping funnel was added dropwise to the three-necked flask at -10°C, and stirred for 2 hours after the dropwise addition. After filtration and washing, the solvent is removed to obtain a silane-terminated acrylate;

[0028] (S...

Embodiment 2

[0032] A sustained-release polycarboxylate water-reducing agent, comprising a main chain alternately combined with organosilicon units and polyether units, wherein the side chains of the organosilicon units contain silane-terminated acrylate structural units.

[0033] The preparation method of the slow-release polycarboxylate water-reducing agent is as follows:

[0034] (S.1) Synthesis of Acrylate Structural Unit: Under nitrogen protection, 0.1 mol of hydroxyethyl acrylate and 0.1 mol of triethylamine were dissolved in 200 ml of dichloromethane, placed in a three-necked flask, and then 0.15 mol of Dimethylvinylchlorosilane was dissolved in 100ml of dichloromethane and added to the constant pressure dropping funnel. The solution in the constant pressure dropping funnel was added dropwise to the three-necked flask at -10°C, and stirred after the dropwise addition was completed. 5h, filter and wash with water and remove the solvent to obtain silane-terminated acrylate;

[0035] ...

Embodiment 3

[0039] A sustained-release polycarboxylate water-reducing agent, comprising a main chain alternately combined with organosilicon units and polyether units, wherein the side chains of the organosilicon units contain silane-terminated acrylate structural units.

[0040] The preparation method of the slow-release polycarboxylate water-reducing agent is as follows:

[0041](S.1) Synthesis of Acrylate Structural Unit: Under nitrogen protection, 0.1 mol of hydroxyethyl acrylate and 0.1 mol of triethylamine were dissolved in 200 ml of dichloromethane, and placed in a three-necked flask, and then 0.12 mol of Dimethylvinylchlorosilane was dissolved in 100ml of dichloromethane and added to the constant pressure dropping funnel. The solution in the constant pressure dropping funnel was added dropwise to the three-necked flask at -10°C, and stirred after the dropwise addition was completed. 3h, filter and wash, remove the solvent to obtain silane-terminated acrylate;

[0042] (S.2) Synth...

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Abstract

The present invention relates to the field of construction engineering, in particular to a slow-release polycarboxylate water reducer, which comprises a main chain composed of organosilicon units and polyether units alternately, wherein the side chains of the organosilicon units contain silane Capped acrylate structural units. The invention overcomes the defects that the polycarboxylate water reducer in the prior art is sensitive to fluctuations in the quality of concrete raw materials, resulting in cumbersome operation and increased costs. Its main chain is composed of organic silicon structural units and polyether units, so that its The main chain itself also has a certain surfactant effect, so that the various components in the concrete can be mixed more stably, and the acrylate structural unit is blocked by silane, so it will be in the cement mixing process due to the alkalinity of the cement The hydrolysis occurs slowly, thereby slowly releasing the acrylic group, which has the advantage of long-term regulation of concrete performance, and will not fail due to quality fluctuations of concrete raw materials.

Description

technical field [0001] The invention relates to the field of construction engineering, in particular to a slow-release polycarboxylate water-reducing agent. Background technique [0002] Water reducing agent is a concrete admixture that can reduce the amount of mixing water while maintaining the slump of concrete basically unchanged. Most of them are anionic surfactants, such as lignosulfonate, naphthalene sulfonate formaldehyde polymer, etc. After adding the concrete mixture, it has a dispersing effect on the cement particles, which can improve its workability, reduce the unit water consumption, and improve the fluidity of the concrete mixture; or reduce the unit cement consumption and save cement. [0003] Polycarboxylate superplasticizer is a high-performance water-reducing agent. According to its main chain structure, the polycarboxylate-based superplasticizer products can be divided into two categories: one is acrylic acid or methacrylic acid as the main chain. , graf...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G77/14C04B24/42C04B103/30
CPCC08G77/14C04B24/42C04B2103/302
Inventor 王旭叶锋萍朱斌
Owner 桐庐宏基源混凝土有限公司