Preparation method of novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer

A high-dispersion, polycarboxylic acid technology, applied in the direction of climate sustainability, sustainable waste treatment, solid waste management, etc., can solve the problem of poor slump retention, inability to simultaneously improve initial water reduction rate and slump retention, Extend the slump retention and other issues to achieve the effect of raising the upper limit of performance, increasing product competitiveness, and improving initial water reduction and slump retention

Pending Publication Date: 2022-08-09
河北凯瑞化工有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the deficiencies of the prior art, the present invention provides a preparation method of a new polycarboxylate water reducer with high dispersion and high slump retention, which solves the problem that conventional polycarboxylate water reducers cannot simultaneously improve the initial water reducing rate and slump retention , when the water reducing rate is high, the slump retention will become worse, and the problem of prolonging the slump retention will inevitably sacrifice the initial water reducing rate

Method used

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  • Preparation method of novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer
  • Preparation method of novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer

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Embodiment 1

[0029] A preparation method of a novel polycarboxylate water-reducing agent with high dispersibility and high slump retention, specifically comprising the following steps:

[0030] Step 1. Preparation of base solution: add 500 parts of water into the reaction kettle, add 360 parts of diethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 3000, and stir until completely dissolved to obtain diethylene glycol monovinyl polyoxyethylene. Oxyethylene ether aqueous solution, let stand for 30min, after defoaming, add 3 parts of diethylene glycol divinyl ether;

[0031] Step 2: Additive preparation: add 50 parts of water into a stirring tank, then add 30 parts of acrylic acid, stir evenly and store in the dripping tank A to obtain the dripping liquid A, and then add 50 parts of water to another stirring tank. In the tank, add 0.3 part of vitamin, stir evenly, and store in the dripping tank B to obtain the dripping solution B;

[0032] Step 3, dropwise reaction: a...

Embodiment 2

[0035] A preparation method of a novel polycarboxylate water-reducing agent with high dispersibility and high slump retention, specifically comprising the following steps:

[0036] Step 1. Preparation of base solution: add 400 parts of water into the reaction kettle, add 360 parts of 4-hydroxybutyl vinyl polyethylene glycol polyoxyethylene ether with a molecular weight of 4000, and stir until completely dissolved to obtain 4-hydroxybutyrin After the aqueous solution of vinyl polyethylene glycol polyoxyethylene ether, let stand for 30 minutes, and after defoaming is completed, add 5 parts of diethylene glycol divinyl ether;

[0037] Step 2. Additive preparation: add 50 parts of water into a stirring tank, then add 26 parts of acrylic acid, stir evenly and store in the dripping tank A to obtain the dripping liquid A, then add 50 parts of water to another stirring tank. In the tank, add 0.4 part of vitamin C, stir evenly and store in the dripping tank B to obtain dripping liquid ...

Embodiment 3

[0041] A preparation method of a novel polycarboxylate water-reducing agent with high dispersibility and high slump retention, specifically comprising the following steps:

[0042] Step 1, base liquid preparation: add 400 parts of water into the reaction kettle, add 360 parts of diethylene glycol monovinyl polyoxyethylene ether with a molecular weight of 3000, and stir until completely dissolved to obtain diethylene glycol monovinyl polyoxyethylene After the vinyl ether aqueous solution, let stand for 30min, after the defoaming is completed, add 3 parts of 4-hydroxybutyl divinyl ether;

[0043] Step 2. Additive preparation: add 20 parts of water into a stirring tank, then add 30 parts of acrylic acid, stir evenly and store in the dripping tank A to obtain the dripping liquid A, and then add 50 parts of water to another stirring tank. In the tank, add 0.4 part of vitamin C, stir evenly and store in the dripping tank B to obtain dripping liquid B;

[0044]Step 3, dropwise react...

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Abstract

The invention discloses a preparation method of a novel high-dispersity and high-slump-retaining polycarboxylate superplasticizer. The preparation method specifically comprises the following steps: step 1, preparing a base solution; step 2, preparing an additive; step 3, dropwise adding for reaction; and 4, adjusting the pH value. The invention relates to the technical field of concrete admixture synthesis. According to the preparation method of the novel high-dispersity and high-slump-retaining polycarboxylic acid water reducing agent, a third monomer vinyl diether is introduced, an original inherent molecular structure is changed, an uncharged short side chain is introduced to a polycarboxylic acid molecule, the distance of a long side chain is increased, and the slump-retaining property of the polycarboxylic acid water reducing agent is improved; the number of effective polycarboxylic acid molecules can be increased to a certain extent under the condition that the polymerization degree of the polycarboxylic acid molecules is not changed, initial water reduction and slump loss resistance can be improved at the same time, the technical direction of a C6 synthesis process is widened structurally, and the purpose of improving the upper limit of the performance of the polycarboxylic acid is achieved. The expected polycarboxylic acid structure effect can be achieved by directly adding the comonomer into the base material, and the production is simple and convenient.

Description

technical field [0001] The invention relates to the technical field of concrete admixture synthesis, in particular to a preparation method of a novel polycarboxylate water reducer with high dispersibility and high slump retention. Background technique [0002] With the increasing demand for more cost-effective polycarboxylate superplasticizers in the market, there are many types of machine-made sand for concrete, and the quality of materials varies. Traditional polycarboxylate superplasticizers often have high water-reducing properties or low slump retention. The single characteristic of water reduction and high slump protection is difficult to adapt to the needs of various floor materials. Every time a floor material is changed, the mix ratio needs to be readjusted. The amount of experiment is large, and the cost of materials is difficult to control. come in very big trouble. [0003] Conventional polycarboxylate superplasticizers are copolymerized with acrylic acid and po...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F216/12C08F4/40C04B24/26C04B103/30
CPCC08F283/065C08F4/40C04B24/2605C04B2103/302C08F220/06C08F216/125Y02W30/91
Inventor 倪文明王卫星王文亮于连林李雪峰关建奇
Owner 河北凯瑞化工有限公司
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