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Modified naphthalene water reducer preparation method

A naphthalene-based water reducer and modification technology, applied in the field of concrete admixtures, can solve problems such as difficult construction and large slump loss, and achieve good effect, high fluidity, and simple preparation process

Active Publication Date: 2016-12-07
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

As a representative of the second-generation water reducer, the outstanding features of naphthalene-based water reducer are high water reducing rate, good cement dispersion effect, and can greatly reduce the amount of water or cement per side. It is used to prepare high-strength and high-durability concrete. , but its disadvantage is that the slump loss is large, which makes construction difficult, and with the further improvement of high-performance concrete on the water-reducing performance, dispersion performance and slump retention performance of high-efficiency water-reducing agents, people are more interested in naphthalene-based water-reducing agents. More and more attention has been paid to the research on the synthesis, modification and compounding of water agents

Method used

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  • Modified naphthalene water reducer preparation method
  • Modified naphthalene water reducer preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] (1) Preparation of polycondensation monomer:

[0029] Put 163.3 parts of fumaric acid, 40.4 parts of styrene, 59.1 parts of sodium hypophosphite and 255.5 parts of water into the reactor, and heat it to 60-70°C while stirring; add 65.0 parts of 32% liquid caustic soda to adjust the pH value of the reaction system 5~7; add 210.5 parts of hydroxyethyl acrylate and 6.2 parts of ammonium persulfate to 200 parts of water to make a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer A.

[0030] (2) A modified naphthalene-based water reducer, the preparation steps of which are as follows:

[0031] (1) Sulfonation: put 138 parts of industrial naphthalene and 28 parts of methylnaphthalene into the reaction kettle and heat and melt to 130-135°C, add 145 parts of 98% concentrated sulfuric acid, and sulfonate at 160°C for 3-4 hours;

[0032] (2) Hydrolysis: cool down to 120°C, add 9.7 parts of phosphoric acid and 100 parts of water,...

Embodiment 2

[0036] (1) Preparation of polycondensation monomer:

[0037] Put 148.6 parts of maleic anhydride, 67.1 parts of styrene, 57.0 parts of sodium hypophosphite and 258.2 parts of water into the reaction kettle, and heat to 60-70°C while stirring; add 62.0 parts of 32% liquid alkali to adjust the pH value of the reaction system 5~7; add 200.3 parts of hydroxypropyl acrylate and 6.8 parts of ammonium persulfate to 200 parts of water to form a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer B.

[0038] (2) A modified naphthalene-based water reducer, the preparation steps of which are as follows:

[0039] (1) Sulfonation: Put 128 parts of industrial naphthalene and 46 parts of β-naphthol into the reaction kettle and heat and melt to 130-135°C, add 150 parts of 98% concentrated sulfuric acid, and perform sulfonation reaction at 160°C for 3-4 hours;

[0040] (2) Hydrolysis: cool down to 120°C, add 10.4 parts of phosphoric acid and 10...

Embodiment 3

[0044] (1) Preparation of polycondensation monomer:

[0045] Put 137.5 parts of citraconic acid, 51.8 parts of styrene, 72.4 parts of sodium hypophosphite and 261.4 parts of water into the reaction kettle, and heat to 60-70°C while stirring; add 56.8 parts of 32% liquid caustic soda to adjust the pH value of the reaction system 5~7; add 212.6 parts of hydroxypropyl acrylate and 6.3 parts of potassium persulfate to 200 parts of water to form a mixed solution, and drop it in 3~4 hours; Discharge at about 40°C to obtain co-condensation monomer C.

[0046] (2) A modified naphthalene-based water reducer, the preparation steps of which are as follows:

[0047] (1) Sulfonation: Put 162 parts of industrial naphthalene into the reaction kettle and heat and melt to 130-135°C, add 163.7 parts of 98% concentrated sulfuric acid, and perform sulfonation reaction at 160°C for 3-4 hours;

[0048] (2) Hydrolysis: cool down to 120°C, add 8.2 parts of phosphoric acid and 100 parts of water, an...

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Abstract

The invention relates to a modified naphthalene water reducer preparation method, and belongs to the field of concrete admixture. The preparation method includes the steps: (1) preparing copolycondensation monomer from unsaturated dicarboxylic acid, styrene and acrylic acid hydroxyalkyl ester under the action of sodium hypophosphite and initiator; (2) preparing a modified naphthalene water reducer from naphthalene homolog, the copolycondensation monomer, concentrated sulfuric acid, phosphoric acid, formaldehyde and the like by the stages of sulfonation, hydrolysis, condensation and neutralization. A large quantity of carboxyl, hydroxy and phosphate are led into the molecular structure of the water reducer, high water reducing rate of the naphthalene water reducer is kept, hydration of cement can be delayed, the slump retention ability of concrete is improved, the concrete has high flowability after 2 hours, and transportation and construction are facilitated. The preparation method is simple in preparation process, convenient to use, good in effect and high in practicability.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a modified naphthalene-based water reducer, and in particular to a preparation method of the water reducer. Background technique [0002] Water reducer, also known as plasticizer, is one of the admixtures to improve the rheological properties of concrete, and has gradually become the fifth component in modern concrete besides cement, sand, stone and water. [0003] Commonly used water reducers can be divided into lignosulfonic acid series, naphthalene series, melamine series, sulfamic acid series and polycarboxylic acid series according to the variety, and can be divided into ordinary water reducers and high-efficiency water reducers according to the water reducing rate. and high performance water reducer. From the 1930s to the 1960s was the application and development period of ordinary water reducing agents, mainly organic compounds such as so...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/22C08F220/28C08F222/02C08F212/08C08F222/08C08F8/36C08F8/12C08F8/28
CPCC04B24/22C04B2103/302C08F8/36C08F220/28C08F220/281C08F222/02C08F212/08C08F222/08C08F8/12C08F8/28
Inventor 陈国新祝烨然王冬唐修生温金保杜志芹刘兴荣蔡明付丹华黄国泓孙国荣孙清玉方绪顺
Owner NANJING RUIDI HIGH TECH
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