Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof

A technology of polycarboxylate and water reducer, applied in the field of functional polycarboxylate water reducer and its preparation, can solve the problems of unstable concrete performance, failure to achieve the effect, no water reducer, etc., and achieve excellent collapse Effects of sag retention, reduction of water-cement ratio, and low air entrainment

Inactive Publication Date: 2015-09-02
WUHAN UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] At present, domestic research on functionalized polycarboxylate superplasticizers used with silica fume is less, resulting in the absence of special superplasticizers when concrete is mixed with silica fume, resulting in unstable performance of concrete and failing to achieve the expected effect

Method used

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  • Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof
  • Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof
  • Functionalized polycarboxylic acid water reducer matched with silica fume and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The three-necked flask equipped with a stirrer was placed in a temperature-controlled electric heating mantle, and a three-block polyether monomer (ethylene oxide-propylene oxide-ethylene oxide three-block polyether monomer, molecular weight: 2600, wherein the weight ratio of ethylene oxide and propylene oxide in the molecular formula is 10:1) 155.1g, γ-methacryloxypropyltrimethoxysilane 27.4g, acrylic acid 21.5g, water 200g, stirring Evenly, heat up to 30°C, then add 7g of ammonium persulfate, and at the same time add dropwise the reducing agent aqueous solution obtained by dissolving 0.15g of sodium sulfite in 2g of water and the chain transfer agent obtained by dissolving 0.3g of dithiopropanol in 3g of water aqueous solution, added dropwise for 4 hours, incubated for 2 hours, then added 60g of 30wt% NaOH solution to neutralize the reaction solution to pH=6~7, and obtained a functionalized polycarboxylate water reducer (molecular weight is about 33000), add water to ...

Embodiment 2

[0037] The three-necked flask equipped with a stirrer was placed in a temperature-controlled electric heating mantle, and a three-block polyether monomer (ethylene oxide-propylene oxide-ethylene oxide three-block polyether monomer, molecular weight: 4500, wherein the weight ratio of ethylene oxide and propylene oxide in the molecular formula is 18:1) 146g, vinyltrimethoxysilane 17.6g, vinyltriethoxysilane 18.9g, maleic anhydride 25.2g, water 200g, stir evenly, heat up to 40°C, then add 8.7g of potassium persulfate, dropwise add the reducing agent vitamin C 0.15g dissolved in 5g aqueous solution and the chain transfer agent dithiopropanol 0.3g dissolved in 5g aqueous solution, drop Add for 3 hours, heat preservation and aging for 1 hour, add 60g of 30wt% NaOH solution to neutralize the polymer to pH=6~7, obtain the functionalized polycarboxylate water reducer (molecular weight approx. is 27000), add water to dilute the water reducer mother liquor with a solid content of 10%, an...

Embodiment 3

[0039] The three-necked flask equipped with a stirrer was placed in a temperature-controlled electric heating mantle, and a three-block polyether monomer (ethylene oxide-propylene oxide-ethylene oxide three-block polyether monomer, molecular weight: 5500, wherein the weight ratio of ethylene oxide to propylene oxide in the molecular formula is 20:1) 146g, vinyl tris (β-methoxyethoxy) silane 23.9g, vinyl tris (β-methoxy Ethoxy) silane 12.6g, acrylic acid 7.1g, maleic anhydride 25.2g, water 200g, stir evenly, heat up to 35°C, then add ammonium persulfate 7g, dropwise add reducing agent sodium sulfite 0.15g to be dissolved in 10g aqueous solution and Dissolve 0.3 g of chain transfer agent dithiopropanol in 10 g of aqueous solution, add dropwise for 4 hours, heat-preserve and mature for 2 hours, add 60 g of 30 wt % NaOH solution to neutralize the polymer to pH = 6-7, and obtain a solid compound used in conjunction with silica fume. The functionalized polycarboxylate superplasticiz...

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Abstract

The invention relates to a functionalized polycarboxylic acid water reducer matched with silica fume and a preparation method thereof. The water reducer is prepared by copolymerizing a ternary block polyether monomer, an unsaturated monomer and a C=C-containing silane coupling agent. The preparation method comprises the following steps: adding the ternary block polyether monomer, unsaturated monomer, C=C-containing silane coupling agent and water into a reaction vessel, stirring uniformly to obtain a reaction solution, heating to 30-40 DEG C, adding an initiator, dropwisely adding a reducer water solution and a chain-transfer agent water solution, keeping the temperature for curing for 1-2 hours, and adding an alkali solution to regulate the pH value of the reaction solution to 6-7. The method has the advantages of simple preparation technique, controllable reaction conditions and lower requirements for production equipment. The prepared water reducer has the advantages of favorable compatibility with silica fume, low doping amount, high water reduction rate, favorable slump retention property and proper air-entraining property, and is a high-performance polycarboxylic acid water reducer.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a functionalized polycarboxylate water reducer used in conjunction with silica fume and a preparation method thereof. Background technique [0002] Silica fume is a by-product of the production process of ferrosilicon alloy and industrial silicon. It consists of extremely fine spherical particles with an average diameter of 0.1 μm, which is two orders of magnitude smaller than that of ordinary Portland cement, and can exhibit excellent dense filling properties. . As an industrial by-product, silica fume has significant technical, economic and ecological benefits in concrete. At present, silica fume is more and more widely used in concrete, especially when it is used in high-performance concrete, it plays a great role in improving the strength and durability of concrete. With the development of modern cement concrete technology, the amount of auxiliary ce...

Claims

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Application Information

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IPC IPC(8): C04B24/42C04B103/30C04B14/14
Inventor 黄健马保国王允栋稂合清李相国蹇守卫谭洪波
Owner WUHAN UNIV OF TECH
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