Polycarboxylic acids series water reducer and method for making same

A polycarboxylic acid-based, water-reducing agent technology, applied in the field of building materials, can solve the problems of poor control of cement plasticizing effect and low water-reducing rate, and achieves overcoming poor control of plasticizing effect, stable performance, and excellent plasticity. effect of

Inactive Publication Date: 2008-06-18
SICHUAN NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] One of the purposes of the present invention is to provide a new polycarboxylate water reducer, which has excellent plasticizing effect, can independently control the fluidity of concrete slurry and the change of slurry fluidity over time, and can overcome the existing Problems such as poor control of cement plasticizing effect by technical water reducing agent and low water reducing rate

Method used

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  • Polycarboxylic acids series water reducer and method for making same
  • Polycarboxylic acids series water reducer and method for making same
  • Polycarboxylic acids series water reducer and method for making same

Examples

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Embodiment 1

[0036] This embodiment is a polycarboxylate water reducer prepared by the following method:

[0037] The first step, esterification reaction: take PEG 1 (Molecular weight 800) 32g (0.04mol), PEG 2 (Molecular weight 600) 24g (0.04mol), PEG 3 (Molecular weight 400) 8g (0.02mol), put into the 250mL four-necked bottle that breakpoint thermometer, condenser tube, agitator, separatory funnel are housed, add 15g 3A type molecular sieves (spherical shape, diameter 3~5mm) simultaneously; Add 6.92mL (0.1mol) of acrylic acid in a continuous dropwise manner, and the dropwise addition is completed within 1.5 hours; at the same time, add 0.71g of catalyst p-aminobenzenesulfonic acid and 0.008g of polymerization inhibitor hydroquinone, and carry out esterification reaction at 95°C , After 5h, polyoxyethylene allyl ester (PA) was obtained.

[0038] The second step, polymerization reaction: add 9.54g (0.06mol) MAS and appropriate amount of distilled water in the 1000mL four-necked flask tha...

Embodiment 2

[0041] This embodiment is a polycarboxylate water reducer prepared by the following method:

[0042] The first step, esterification reaction: take PEG 1 (Molecular weight 800) 32g (0.04mol), PEG 2 (Molecular weight 600) 24g (0.04mol), PEG 3 (Molecular weight 400) 8g (0.02mol), put into the 250mL four-necked bottle that breakpoint thermometer, condenser tube, agitator, separatory funnel are housed, add 15g 3A type molecular sieves (spherical shape, diameter 3~5mm) simultaneously; Add 9mL (0.13mol) of acrylic acid in a continuous dropwise manner, and the dropwise addition is completed within 1.5 hours; at the same time, add 0.71g of catalyst p-toluenesulfonic acid and 0.01g of polymerization inhibitor hydroquinone, and carry out esterification reaction at 90°C , After 5h, polyoxyethylene allyl ester (PA) was obtained.

[0043] The second step, polymerization reaction: add 31.8g (0.2mol) MAS and appropriate amount of distilled water to be mixed with 20% solution in the 1000mL ...

Embodiment 3

[0046] This embodiment is a polycarboxylate water reducer prepared by the following method:

[0047] The first step, esterification reaction: take PEG 1 (Molecular weight 1500) 60g (0.04mol), PEG 2 (molecular weight 1000) 40g (0.04mol), PEG 3 (Molecular weight 600) 12g (0.02mol), put into the 250mL four-necked bottle that breakpoint thermometer, condenser, stirrer, separatory funnel are housed, add 15g 3A molecular sieves (spherical shape, diameter 3~5mm) simultaneously; Add 8.31mL (0.12mol) of acrylic acid in a continuous dropwise manner, and the dropwise addition is completed within 1.5 hours; at the same time, add 5.43g of catalyst p-aminobenzenesulfonic acid and 0.009g of polymerization inhibitor hydroquinone, and carry out esterification reaction at 95°C , After 5h, polyoxyethylene allyl ester (PA) was obtained.

[0048] The second step, polymerization reaction: add 19.08g (0.12mol) MAS and appropriate amount of distilled water in the 1000mL four-necked flask that brea...

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Abstract

The invention discloses a polycarboxylate type water reducer, the molecule chains of the water reducer contains two different-length polyethylene oxide side chains, the polycarboxylate type water reducer not only have high water reducing rate, but also have excellent plasticizing effect and can self-control the concrete slurry fluidity and gradual slurry fluidity variety, thereby overcoming the problems that the prior water reducer has poor cement plasticizing effect and low water reducing rate. The polycarboxylate type water reducer does not contain chloride ion and has corrosion on reinforced concrete and strong adaptability, and can applied for various specs of cements, and has stable performance and no delamination and sedimentation for long-term storage, and no crystallization in winter; the product has no toxicity and pollution, and no formaldehydel and is safe for environment. The invention also discloses a preparation method of the polycarboxylate type water reducer.

Description

technical field [0001] The invention belongs to the technical field of building materials, in particular to a concrete admixture polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Concrete is the largest and most widely used building material in the world, and water reducing agent is the most widely studied and used concrete admixture. Because the polycarboxylate superplasticizer with comb-shaped molecular structure has the characteristics of strong dispersibility, low dosage and high water reducing rate, in recent years, the research focus of North America, European countries and Japan has gradually shifted to polycarboxylate. The synthesis and application methods of many new polycarboxylate superplasticizers have been extensively researched and developed, and the degree of commercial development and promotion has been relatively high. [0003] In my country, naphthalene-based high-efficiency water-reducers are currently the most ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C04B103/30
CPCC04B24/2641C04B2103/302C04B2111/26C04B2111/00017C04B2111/1006C04B2111/1062
Inventor 赵仕林王为廖洋马俊马玉洁刘佩
Owner SICHUAN NORMAL UNIVERSITY
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