Early strength type polycarboxylic type water reducer and preparation method thereof

A polycarboxylic acid-based and water-reducing agent technology, which is applied in the field of concrete admixture synthesis, can solve problems such as unsatisfactory application effects, and achieve the effects of accelerating construction progress and labor productivity, improving formwork turnover rate and good durability.

Active Publication Date: 2018-12-14
HEBEI SANKAISHENFA SCI & TECH CORP LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the research on early-strength polycarboxylate water-reducers in my country has also been reported, but the actual application effect is not id

Method used

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  • Early strength type polycarboxylic type water reducer and preparation method thereof
  • Early strength type polycarboxylic type water reducer and preparation method thereof
  • Early strength type polycarboxylic type water reducer and preparation method thereof

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preparation example Construction

[0022] The preparation process of the early-strength polycarboxylate water reducer of the present invention is completed in three steps:

[0023] The first step: formic acid·dimethylaminoethyl acrylate[CH 2 =CHCOOCH 2 CH 2 N + H(CH 3 ) 2 HCOO - ] preparation

[0024] (1) Add 92g of deionized water and 92g of formic acid into a 1000mL four-neck flask, and drop in an equimolar amount of 286g of dimethylaminoethyl acrylate with a peristaltic pump under stirring at a constant temperature of 15°C, and drop it in 2.0 hours;

[0025] (2) After the dropwise addition, the reaction was continued at 15° C. for 1.5 h, and 286 g of deionized water was added to make the solid content of the reaction product 50% (by mass), to obtain an aqueous solution of formic acid·dimethylaminoethyl acrylate.

[0026] The second step: preparation of dripping solution

[0027] (1) Liquid A: 4.5-6.0% (mass) of acrylic acid and 1.5-2.5% (mass) of 3-allyloxy-1-hydroxypropane of the mass of prenol poly...

Embodiment 1

[0038] (1) Add 32.7g of deionized water, 17.5g of 3-allyloxy-1-hydroxypropanesulfonic acid and 31.5g of acrylic acid into a 250mL Erlenmeyer flask, mix well, and add liquid A dropwise;

[0039] (2) Add 35g of 50% formic acid·dimethylaminoethyl acrylate, 35g of 3-acryloyloxy-2-hydroxypropyltrimethylammonium chloride and 21g of deionized ammonium chloride into a 250mL Erlenmeyer flask and mix evenly to form a dropwise Add liquid B;

[0040] (3) Add 35g of deionized water, 10.5g of N-hydroxyethyl-N'-acryloyl urea and 24.5g of methoxyethoxyethyl acrylate into a 250mL Erlenmeyer flask and mix evenly. ;

[0041] (4) Add 94.62g of deionized water, 1.66g of vitamin C and 3.32g of 3-mercaptopropionic acid into a 250mL Erlenmeyer flask and mix well to form the dripping solution D;

[0042] (5) Add 700 g of prenol polyoxyethylene ether macromonomer and 376.9 g of deionized water into a 2000 mL four-neck flask, heat and stir to dissolve them. Add 6.64g of ammonium persulfate and 3.32g ...

Embodiment 2

[0045] (1) Add 34.1g of deionized water, 14.0g of 3-allyloxy-1-hydroxypropanesulfonic acid and 37.1g of acrylic acid into a 250mL Erlenmeyer flask, mix well, and add liquid A dropwise;

[0046] (2) Add 42g of 50% formic acid·dimethylaminoethyl acrylate, 30.63g of 3-acryloyloxy-2-hydroxypropyltrimethylammonium chloride and 18.37g of deionized ammonium chloride into a 250mL Erlenmeyer flask and mix evenly. To add liquid B dropwise;

[0047] (3) Add 35g of deionized water, 7.0g of N-hydroxyethyl-N'-acryloyl urea and 28.0g of methoxyethoxyethyl acrylate into a 250mL Erlenmeyer flask, mix well, and add liquid C dropwise ;

[0048] (4) Add 94.81g of deionized water, 1.66g of vitamin C and 3.33g of 3-mercaptopropionic acid into a 250mL Erlenmeyer flask and mix well to add solution D dropwise;

[0049] (5) Add 700 g of prenol polyoxyethylene ether macromonomer and 376.9 g of deionized water into a 2000 mL four-neck flask, heat and stir to dissolve them. Add 6.65g of ammonium persul...

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Abstract

The invention relates to an early strength type polycarboxylic type water reducer and a preparation method thereof. TPEG and 3-allyloxy-1-hydroxy propanesulfonic acid which have fast dispersion, highdispersion and excellent water reduction functions, monomers formic acid and dimethylaminoethyl acrylate, 3-acryloyloxy-2-hydroxypropyltrimethyl ammonium chloride and N-hydroxyethyl-N'-acroloyl-urea which have the early strength function as well as monomer 3-acryloyloxy-2-hydroxypropyltrimethyl ammonium chloride and methoxyethoxyethyl acrylate which have the slump retaining function are introducedin the synthesis process, and after the reaction ends, triethanolamine with the early strength and triisopropanolamine with later strength are used for neutralization. The synthesized early strengthtype polycarboxylic type water reducer has outstanding fast dispersion, high dispersion and rapid hydration functions, the enhancement effect is notable by blending the early strength type water reducer in concrete, the early strength is substantially improved, the later strength can be stably developed, and high strength and good durability of concrete are realized.

Description

technical field [0001] The invention belongs to the technical field of concrete admixture synthesis, and in particular relates to an early-strength polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate high-performance water reducer has the advantages of good dispersibility, high water reducing rate, low dosage, strong slump retention, low shrinkage, no "three wastes" in the production process, and environmental protection. widespread attention of the people. In recent years, polycarboxylic acid-based high-performance water reducing agents have been widely used in the above infrastructure construction and played an important role. At present, my country's construction industry is developing rapidly, especially the construction of Xiong'an New District is developing rapidly. Xiong'an New District will build a world-class, green, modern, and smart new city. More than 90% of the buildings will use green prefabricated buil...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/34C08F220/58C08F216/14C08F220/60C04B24/16C04B103/30
CPCC04B24/165C08F283/065C04B2103/302C08F216/1475C08F220/34C08F220/282C08F220/603
Inventor 马国栋谢红靳通收王文彬陈占虎边延伟张茜范钊
Owner HEBEI SANKAISHENFA SCI & TECH CORP LTD
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