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Polycarboxylate superplasticizer with nano size and preparation method thereof

A nano-sized, polycarboxylic acid technology, applied in the direction of sustainable waste treatment, solid waste management, climate sustainability, etc., can solve the problems of poor adaptability of water reducing agents, inability to control size, particle size and configuration well , to achieve high water-reducing performance, good slump protection effect, and the effect of controlling reaction efficiency

Pending Publication Date: 2022-07-08
JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Therefore, the technical problem to be solved by the present invention is to overcome defects such as the inability to control the size, particle size and configuration of the polycarboxylate water-reducer in the prior art, and the poor adaptability of the existing water-reducer, thereby Provide a nano-sized polycarboxylate water reducer and its preparation method

Method used

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  • Polycarboxylate superplasticizer with nano size and preparation method thereof
  • Polycarboxylate superplasticizer with nano size and preparation method thereof
  • Polycarboxylate superplasticizer with nano size and preparation method thereof

Examples

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Embodiment 1

[0101] The present embodiment provides a templating agent and a preparation method thereof, and the preparation method of the templating agent comprises the following steps:

[0102] (1) Mix 0.01mol triethylenetetramine and 0.05mol 1,3-butadiene, stir at room temperature for 10h, then heat up to 70°C and react for 24h, then add 0.05mol cysteamine and 5ml dimethylmethylene in turn The sulfone was stirred at room temperature for 30 min and washed with ice water to obtain a white solid, the first intermediate product.

[0103] (2) 0.1 mol of 1,3-butadiene was added to the first intermediate product at room temperature, stirred for 10 h, then placed at 70°C for 24 h to carry out a double bond addition reaction, and then 0.1 mol of cysteamine was added , stirred for 30min to carry out amino addition reaction, then cooled to room temperature, then added 0.2mol 1,3-butadiene, stirred for 10h, then placed at 70 °C for 24h reaction, carried out double bond addition reaction, and then a...

Embodiment 2

[0106] The present embodiment provides a method for preparing a nano-sized polycarboxylate water-reducing agent, comprising the following steps:

[0107] Preparation of hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether

[0108] 100g of ethylene glycol monovinyl ether and 0.25g of sodium hydroxide were added to the autoclave, and after three times of nitrogen replacement, stirring was started, and the temperature of the reactor was raised to 110°C, and 160g of ring was fed into the reactor under an oxygen-free environment. Oxypropane, ripening reaction for 1h, after the reaction is complete, add 2000g of ethylene oxide to the reaction kettle, and ripen for 1h. After the reaction of ethylene oxide is complete, the reaction kettle is cooled to 90 ℃, and acetic acid is added to carry out the neutralization reaction. The pH reaches 6-7 to obtain hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with an average molecular we...

Embodiment 3

[0117] The present embodiment provides a method for preparing a nano-sized polycarboxylate water-reducing agent, comprising the following steps:

[0118] Preparation of hydroxyalkyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether

[0119] Take 100g of ethylene glycol monovinyl ether and 0.25g of sodium hydroxide and add it to the autoclave. After replacing it with nitrogen three times, start stirring. Propane, ripening reaction for 1h, after the reaction is complete, add 2000g of ethylene oxide to the reaction kettle, and ripen for 1h, after the reaction of ethylene oxide is complete, reduce the temperature in the reaction kettle to 90 ℃, add acetic acid, and carry out the neutralization reaction, The pH of the product is adjusted to 6-7 to obtain hydroxyethyl-terminated vinyl-terminated polyoxypropylene polyoxyethylene ether with an average molecular weight of 2000; wherein, ethylene oxide and propylene oxide are added to the reaction kettle under anaerobic...

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Abstract

The invention belongs to the technical field of preparation of concrete admixtures, and particularly relates to a polycarboxylic acid water reducing agent with a nanometer size and a preparation method thereof. The preparation method comprises the following steps: (1) preparing hydroxyalkyl vinyl-terminated polyoxypropylene polyoxyethylene ether; (2) preparing trimethylolpropane polyoxyethylene polyoxypropylene ether triacrylate; (3) preparing a template agent; and (4) preparing the polycarboxylic acid water reducing agent with nano size, and limiting the specific preparation steps of the template agent and the polycarboxylic acid water reducing agent. According to the method, hydroxyalkyl-terminated vinyl polyoxypropylene polyoxyethylene ether and trimethylolpropane polyoxyethylene polyoxypropylene ether triacrylate can optimize the main chain structure and the particle size of the water reducing agent under the action of a specific template agent, the particle size of the obtained water reducing agent is 60-80 nm, and the dispersion index is 1.01-1.02; meanwhile, the obtained water reducing agent has relatively good comprehensive performance, such as excellent water reducing rate, collapse resistance and workability, and particularly, the collapse resistance is remarkably improved.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture preparation, in particular to a nano-sized polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Water reducing agent (also known as superplasticizer, Superplasticizer) is one of the most used concrete admixtures. Its main function is to hinder or destroy cement through surface activity, complexation, electrostatic repulsion or steric repulsion. The flocculation structure of particles can greatly improve the workability and fluidity of concrete, and achieve the effect of saving cement consumption, reducing concrete mixing water consumption and improving concrete strength. As the third generation of water reducing agent, polycarboxylate superplasticizer has quickly occupied most of the market due to its advantages such as low dosage, high water reducing rate, great freedom in molecular structure design and environmental friendliness, and is widely ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/26C04B103/30
CPCC08F283/065C04B24/2605C04B2103/302C08F220/06Y02W30/91
Inventor 何新耀房福贤鲁潇李玉博
Owner JIAHUA CHEM TECH DEV SHANGHAI CO LTD
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