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Ester polycarboxylate slump retaining agent and preparation method thereof

A technology of ester polycarboxylic acid and slump retention agent, applied in the field of building materials, can solve the problems of slump loss, uneven quality, easy bleeding, etc., to control slump loss, small steric hindrance, good adaptability

Active Publication Date: 2014-12-24
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Polycarboxylate superplasticizers have gradually replaced second-generation water reducers such as naphthalene series and become widely used concrete admixtures. Small and other advantages, but in the actual application process, due to the uneven quality of sand and stone materials, some places have high mud content in sand and stone, and some places have to use machine-made sand due to the lack of natural sand, while machine-made The stone powder content and gradation in the sand are not well controlled, so that the application of polycarboxylate superplasticizers in some projects also has problems such as large slump loss, poor workability, and easy bleeding.

Method used

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  • Ester polycarboxylate slump retaining agent and preparation method thereof
  • Ester polycarboxylate slump retaining agent and preparation method thereof
  • Ester polycarboxylate slump retaining agent and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0031] (1) Preparation of bifunctional monomer: Mix 72.00g of acrylic acid, 360.00g of hydroxyethyl acrylate and 11.74g of hydroquinone, under the protection of nitrogen, heat up to 60°C, add 12.07g of concentrated sulfuric acid, and heat up to 110°C , then keep the temperature for 2h, during which the water generated by the reaction is removed by the method of flowing nitrogen with water, and the temperature is lowered to room temperature after the end of the constant temperature to obtain the first mixture;

[0032] (2) Copolymerization reaction: 100.00 g of the first mixture prepared in step (1) is mixed with 69.00 g of methoxypolyethylene glycol propylene glycol acrylate with a molecular weight of 1200, and then 1.17 g of thioglycolic acid is added to obtain the second mixture, The second mixture, hydrogen peroxide aqueous solution (wherein, hydrogen peroxide 3.43g, water 20.00g) and ascorbic acid aqueous solution (wherein, ascorbic acid 0.50g, water 20.00g) were dropped in...

Embodiment 2

[0035] (1) Preparation of bifunctional monomer: Mix 86.00g of methacrylic acid, 650.00g of hydroxypropyl methacrylate and 9.88g of phenothiazine, heat up to 60°C under nitrogen protection, and add 4.52g of p-toluenesulfonic acid , the temperature was raised to 120°C, and the temperature was kept constant for 2 hours. During this period, the water generated by the reaction was removed by vacuuming, and after the constant temperature was completed, it was lowered to room temperature to obtain the first mixture;

[0036](2) Copolymerization reaction: 150.00 g of the first mixture prepared in step (1) is mixed with 120.00 g of methoxypolyethylene glycol propylene glycol acrylate with a molecular weight of 2000, and then 1.12 g of trisodium phosphate is added to obtain the second mixture , drop the second mixture and ammonium persulfate aqueous solution (ammonium persulfate 2.62g, water 40.00g) into 184.71g of water for reaction, keep the reaction temperature at 70°C, and the time f...

Embodiment 3

[0039] (1) Preparation of bifunctional monomer: Mix 49.00g maleic anhydride, 36.00g acrylic acid, 260.00g hydroxypropyl methacrylate, 116.00g hydroxyethyl acrylate, 4.00g hydroquinone and 2.00g phenothiazine , under the protection of nitrogen, the temperature was raised to 50°C, 3.48g of p-toluenesulfonic acid was added, the temperature was raised to 115°C, and the temperature was kept constant for 3 hours. mixture;

[0040] (2) Copolymerization reaction: 150.00 g of the first mixture prepared in step (1) is mixed with 160.00 g of methoxypolyethylene glycol maleate with a molecular weight of 1200, and then 1.30 g of mercaptopropionic acid is added to obtain the second Mixture, the second mixture and potassium persulfate aqueous solution (among them, potassium persulfate 2.50g, water 40.00g) were dropped into 191.72g of water for reaction, keeping the reaction temperature at 60°C, and the dropwise addition time was 3.5 hours, and the dropwise addition was completed After incub...

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Abstract

The invention discloses an ester polycarboxylate slump retaining agent and a preparation method thereof. The molecular weight of the ester polycarboxylate slump retaining agent is 20000-150000, and the structural formula thereof is shown in the specification, wherein R1 is H or CH3, R2 is H or COOM, R3 is an alkyl group with 2-4 carbon atoms, and M is H, Na or NH4. The ester polycarboxylate slump retaining agent provided by the invention can be used independently or compounded with an existing polycarboxylate additive for use, and solves the technical difficulties that the existing polycarboxylate additive is poor in slump retaining performance or has workability degradation and water bleeding after being compounded with a slump retaining agent. When being applied to concrete, the ester polycarboxylate slump retaining agent has better workability and is unlikely to bleed water in comparison with an ether polycarboxylate product, thereby well solving the problems that the widely applied ether polycarboxylate product on the market at present easily has workability degradation and water bleeding after being mixed with concrete.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to an ester polycarboxylic acid slump retaining agent and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizers have gradually replaced second-generation water reducers such as naphthalene series and become widely used concrete admixtures. Small and other advantages, but in the actual application process, due to the uneven quality of sand and stone materials, some places have high mud content in sand and stone, and some places have to use machine-made sand due to the lack of natural sand, while machine-made The stone powder content and gradation in the sand are not well controlled, so that the application of polycarboxylate superplasticizers in some projects also has problems such as large slump loss, poor workability, and easy bleeding. Contents of the invention [0003] The purpose of the present invention is to ove...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F220/06C08F220/28C08F222/14C08F222/06C08F222/16C04B24/26C07C69/54C07C69/60C07C67/08C04B103/30
Inventor 蒋卓君官梦芹方云辉张小芳陈小路
Owner KZJ NEW MATERIALS GROUP CO LTD
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