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A functionalized polycarboxylate water reducer used in conjunction with silica fume and its preparation method

A technology of polycarboxylate and water reducer, which is applied in the field of functionalized polycarboxylate water reducer and its preparation, can solve the problems of unreachable effect, unstable concrete performance, no water reducer, etc., and achieve water reduction Effects of gray ratio, excellent slump retention, and low air entrainment

Inactive Publication Date: 2017-10-24
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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  • A functionalized polycarboxylate water reducer used in conjunction with silica fume and its preparation method
  • A functionalized polycarboxylate water reducer used in conjunction with silica fume and its preparation method
  • A functionalized polycarboxylate water reducer used in conjunction with silica fume and its preparation method

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 dropwise add the reducing agent aqueous solution obtained by dissolving 0.15g of reducing agent 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, to obtain a functionalized polycarboxylate water reducer (molecular weight is about 33000), add water and dilu...

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 polycarboxylate water reducer used in conjunction with silica fume and a preparation method thereof. The water reducer is composed of three block polyether monomers, unsaturated monomers, carbon-carbon double bond-containing The silane coupling agent is obtained by copolymerization, and its preparation method is as follows: add three-component block polyether monomer, unsaturated monomer, carbon-carbon double bond-containing silane coupling agent and water into a reaction vessel, and stir to obtain a reaction solution , heat up to 30-40°C, add initiator, dropwise add aqueous solution of reducing agent and aqueous solution of chain transfer agent, keep warm and mature for 1-2 hours, then add alkali solution to neutralize the reaction solution until the pH value is 6-7, and then obtain. The preparation process of the invention is simple, the reaction conditions are easy to control, and the requirements for production equipment are relatively low, and the prepared water reducer has good compatibility with silica fume, low dosage, high water reducing rate, good slump retention performance, and It is a high-performance polycarboxylate superplasticizer with proper air-entraining properties.

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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Patent Type & Authority Patents(China)
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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