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Polycarboxylate water reducer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of building materials, can solve the problems of complex production process of initiator, poor mud resistance of water reducing agent, high cost, etc., and achieve high double bond retention rate, high water reducing rate, low cost effect

Inactive Publication Date: 2017-01-04
SHANXI UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the production process of the starter agent of the existing products is relatively complicated, which makes the cost of the macromonomer relatively high, and the synthetic water reducer generally has the problem of poor mud resistance

Method used

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  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof
  • Polycarboxylate water reducer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] 1) Preparation of EPEG-2300 macromonomer

[0029] Add 20g of ethylene glycol monovinyl ether and 0.2g of sodium methoxide into a beaker, and stir evenly. Into the closed 1L autoclave, inject the mixed solution of ethylene glycol monovinyl ether and sodium methoxide. Close the reactor, heat up to 100°C, and start to feed ethylene oxide gas. Control the temperature of the reactor to not be higher than 110°C, continue the reaction for 6 hours, and feed about 520 g of ethylene oxide gas in total, then stop feeding the ethylene oxide gas and lower the temperature of the reactor. The product is released after cooling down, and it becomes a white waxy solid after cooling, which is an EPEG macromonomer with an average molecular weight of 2300.

[0030] 2) Preparation of polycarboxylate water reducer

[0031] In a 500ml reaction bottle equipped with a stirrer and a condenser, add 100g of EPEG-2300 macromonomer into 60g of deionized water, heat properly and fully dissolve to m...

Embodiment 2

[0033] 1) Preparation of EPEG-2300 macromonomer

[0034] The preparation method of EPEG-2300 macromonomer is the same as in Example 1.

[0035] 2) Preparation of polycarboxylate water reducer

[0036] In a 500ml reaction bottle equipped with a stirrer and a condenser, add 100g of EPEG-2300 macromonomer into 60g of deionized water, heat properly and fully dissolve to make a reaction bottom liquid; add 0.15g of vitamin C, 8.7g of acrylic acid, Add 0.80 g of 40 g of deionized water in turn, mix and stir evenly, and prepare a drop solution; control the reaction temperature at 20-25 °C, and add 1.0 g of H 2 o 2 , and then drop the dripping liquid at a constant speed, and the dropwise addition is completed in 3 hours; after continuing the heat preservation reaction for 1 hour, add a solution made of 5g NaOH and 60g water, and stir evenly to obtain a polycarboxylate superplasticizer.

Embodiment 3

[0038] 1) Preparation of EPEG-3500 macromonomer

[0039] Add 15g of ethylene glycol monovinyl ether and 0.3g of sodium methoxide into a beaker, and stir evenly. Into the closed 1L autoclave, inject the mixed solution of ethylene glycol monovinyl ether and sodium methoxide. Close the reactor, heat up to 100°C, and start to feed ethylene oxide gas. Control the temperature of the reactor to not be higher than 110°C, continue the reaction for 8 hours, and feed about 600 g of ethylene oxide gas in total, then stop feeding the ethylene oxide gas and lower the temperature of the reactor. The product is released after cooling down, and it becomes a white waxy solid after cooling, which is an EPEG macromonomer with an average molecular weight of 3500.

[0040] 2) Preparation of polycarboxylate water reducer

[0041] In a 500ml reaction bottle equipped with a stirrer and a condenser, add 100g of EPEG-3500 macromonomer into 60g of deionized water, heat properly and fully dissolve to m...

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Abstract

The invention provides a polycarboxylate water reducer and a preparation method thereof, and belongs to the field of preparation of concrete admixtures. The polycarboxylate water reducer is prepared by preparing an unsaturated polyether macromonomer by taking ethylene glycol monovinyl ether as an initiator first and then polymerizing the unsaturated polyether macromonomer (EPEG) with a small monomer acrylic acid. The polycarboxylate water reducer prepared by the preparation method provided by the invention has more hydrophilic groups in a molecular structure, high water reducing rate, obviously enhanced fluidity retention and obviously enhanced mud resistance, so that a relatively high construction requirement can be met.

Description

technical field [0001] The invention relates to building materials, in particular to a concrete admixture, in particular to a polycarboxylate water reducer prepared by using an unsaturated polyether macromonomer and a preparation method thereof. Background technique [0002] Water reducing agent is an essential component in modern concrete besides cement, sand, stone, water and admixtures. Water reducer is an admixture that reduces the water consumption of concrete under the condition of ensuring the same workability of concrete mixture. The use of water reducer can reduce the amount of cement and improve the workability and durability of concrete. It is the core of ready-mixed concrete . It is generally believed that the development of water reducers is divided into three stages: the first generation of ordinary water reducers represented by wood calcium, the second generation of high-efficiency water reducers represented by naphthalene-based water reducers, and the curren...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08F283/06C08F220/06C08G65/28C04B103/30
CPCC04B24/2647C04B2103/302C08F283/065C08G65/2609C08F220/06
Inventor 裴继凯刘冠杰王自卫任建国
Owner SHANXI UNIV
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