Polycarboxylic acid water reducing agent with narrow molecular weight distribution and preparation method thereof

A narrow molecular weight distribution, polycarboxylic acid technology, applied in the field of polycarboxylate water reducing agent preparation, can solve the problems of poor temperature control accuracy, difficulty in achieving dispersion effect, and inability to achieve the best environment, avoiding temperature control, and having a good environment. Beneficial effects on heat transfer as well as cold transfer, molecular weight distribution and improved controllability

Pending Publication Date: 2019-11-05
GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But the controllability of this kind of polymerization reaction is poor, can not obtain the polymerization product of molecular weight in the specified range, if the molecular weight of polymerization product is bigger or smaller, often all be difficult to reach optimal dispersing effect; The distribution also has a certain influence, so the staff need to continuously measure the temperature in the reactor, and need to manually adjust the temperature, the operation is cumbersome, and the accuracy of temperature control is poor, and the best environment for preparation cannot be achieved.

Method used

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  • Polycarboxylic acid water reducing agent with narrow molecular weight distribution and preparation method thereof
  • Polycarboxylic acid water reducing agent with narrow molecular weight distribution and preparation method thereof
  • Polycarboxylic acid water reducing agent with narrow molecular weight distribution and preparation method thereof

Examples

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Effect test

Embodiment 1

[0047] see figure 1 , a polycarboxylate water reducer with a narrow molecular weight distribution, comprising the following components in parts by mass: 60 parts of macromonomer methallyl polyoxyethylene ether, 10 parts of acrylic acid, 8 parts of methacrylic sulfonic acid Sodium, 5 parts of modified acrylate compounds, part of water-soluble initiator, 0.5 part of water-soluble active chain transfer agent, 2 parts of deionized water, 5 parts of hydrogen peroxide, 2 parts of sodium hydroxide solution, the preparation method is as follows: step:

[0048] S1. Weighing the components according to the ratio of the above components;

[0049] S2. Put the macromonomer methallyl polyoxyethylene ether, deionized water and hydrogen peroxide into the reaction kettle, add water to mix and stir, stir and heat up to 18-35°C to obtain a uniform mixed original solution;

[0050] S3. Put acrylic acid, water-soluble initiator, water-soluble active chain transfer agent and deionized water into ...

Embodiment 2

[0054] see figure 1 , a polycarboxylate water reducer with a narrow molecular weight distribution, comprising the following components in parts by mass: 65 parts of macromonomer methallyl polyoxyethylene ether, 11 parts of acrylic acid, 9 parts of methacrylic sulfonic acid Sodium, 5.5 parts of modified acrylate compounds, 1.5 parts of water-soluble initiator, 0.6 part of water-soluble active chain transfer agent, 2.5 parts of deionized water, 6 parts of hydrogen peroxide, 2.5 parts of sodium hydroxide solution, the preparation method is: comprising The following steps:

[0055] S1. Weighing the components according to the ratio of the above components;

[0056] S2. Put the macromonomer methallyl polyoxyethylene ether, deionized water and hydrogen peroxide into the reaction kettle, add water to mix and stir, stir and heat up to 18-35°C to obtain a uniform mixed original solution;

[0057] S3. Put acrylic acid, water-soluble initiator, water-soluble active chain transfer agent...

Embodiment 3

[0061] see figure 1 , a polycarboxylate water reducer with a narrow molecular weight distribution, comprising the following components in parts by mass: 70 parts of macromonomer methallyl polyoxyethylene ether, 12 parts of acrylic acid, 10 parts of methacrylic sulfonic acid Sodium, 6 parts of modified acrylate compounds, 2 parts of water-soluble initiator, 0.8 part of water-soluble active chain transfer agent, 3.5 parts of deionized water, 7 parts of hydrogen peroxide, 3 parts of sodium hydroxide solution, the preparation method is as follows: step:

[0062] S1. Weighing the components according to the ratio of the above components;

[0063] S2. Put the macromonomer methallyl polyoxyethylene ether, deionized water and hydrogen peroxide into the reaction kettle, add water to mix and stir, stir and heat up to 18-35°C to obtain a uniform mixed original solution;

[0064] S3. Put acrylic acid, water-soluble initiator, water-soluble active chain transfer agent and deionized water...

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Abstract

The invention discloses a polycarboxylic acid water reducing agent with narrow molecular weight distribution and a preparation method thereof, belonging to the technical field of slump retaining agentpreparation. The polycarboxylic acid water reducing agent with narrow molecular weight distribution and the preparation method thereof realize that the molecular weight distribution and controllability of the obtained polycarboxylic acid high-efficiency water reducing agent are greatly improved. After propyl polyoxyethylene ether is mixed with a water-soluble initiator and a water-soluble activechain transfer agent, the obtained molecular weight distribution is narrower, and the dispersibility of the product is better. At the same time, sodium methacrylate sulfonate and modified acrylate compounds are added to facilitate improving of the early strength, slump retention, reinforcement and other properties of the prepared polycarboxylic acid water reducing agent; moreover, a heat preservation interlayer with an automatic regulation function is arranged in a reaction kettle, is beneficial to realizing the conversion of heat transfer and cold transfer in the heat preservation interlayer,improving the lifting sensitivity of the temperature in the reaction kettle, eliminating the need for manual temperature regulation, and effectively avoiding the influence on the preparation of the polycarboxylic acid water reducing agent caused by large temperature control difficulty.

Description

technical field [0001] The invention relates to the technical field of preparation of polycarboxylate water reducers, more specifically, to a polycarboxylate water reducer with narrow molecular weight distribution and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is a high-performance superplasticizer and a cement dispersant used in cement concrete. Widely used in highways, bridges, dams, tunnels, high-rise buildings and other projects. In many concrete projects, traditional high-efficiency concrete such as naphthalene series is increasingly unable to meet the needs of projects due to limitations in technical performance. [0003] A new generation of water reducer that has attracted much attention at home and abroad, polycarboxylate high-performance water reducer, because it has truly designed an effective molecular structure based on the mechanism of dispersed cement, has a super-dispersion type, and can prevent concrete slump ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F228/02C08F220/10C08F2/38C08F4/30C08F4/04B01J19/18C04B24/16C04B103/30
CPCB01J19/0013B01J19/0053B01J19/0066B01J19/18B01J2219/0015C04B24/165C04B2103/302C08F283/065C08F220/06C08F228/02C08F220/10C08F2/38C08F4/30C08F4/04
Inventor 卢伟雄肖山虎蔡健
Owner GUANGZHOU JIANSHENG BUILDING MATERIALS CO LTD
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