Preparation method of a low-sensitivity concrete fluidity stabilizer

A concrete and fluidity technology, which is applied in the field of preparation of low-sensitivity concrete fluidity stabilizers, can solve the problems of inability to maintain stable concrete fluidity, high dosage of water reducing agent, high cost of use, etc., and achieve high double bond retention rate , low esterification temperature, and the effect of reducing production energy consumption

Active Publication Date: 2020-07-03
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] CN 103833939A discloses a method for preparing a special slump-retaining agent for cross-linked polycarboxylic acid. The slump-retaining agent prepared by the method has a good slump-retaining effect, but the water-reducing rate is low. The ester group is hydrolyzed under alkaline conditions, and the concrete flows The degree shows a tendency to enlarge, and the trend of not maintaining the stability of the concrete flow performance
CN 102515618A discloses a slow-release slump-proof polymer prepared by taking unsaturated polyoxyethylene ether, acrylic acid, acrylate monomer, crosslinking monomer, chain transfer agent, initiator and water as raw materials, and reacting for 4 to 7 hours. Carboxylic acid water reducer, but the water reducer prepared by this patent has a high content, sensitive application, and high cost of use

Method used

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  • Preparation method of a low-sensitivity concrete fluidity stabilizer
  • Preparation method of a low-sensitivity concrete fluidity stabilizer
  • Preparation method of a low-sensitivity concrete fluidity stabilizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Esterification: 230.00g maleic anhydride, 200.00g molecular weight polyethylene glycol monomethyl ether of 600, 27.60g p-hydroxybenzoic acid, 57.30g o-hydroxyphenylacetic acid, 1.00g hydroquinone and 1.00 Mix g phenothiazine, under the protection of nitrogen, heat up to 65°C, then add 1.00g of periodic acid and 1.70g of dinitrobenzoic acid, heat up to 78°C, keep warm for 0.5h, during this period use vacuum or nitrogen belt The method of water is removed water, is down to room temperature after reaction finishes, obtains the first mixture that contains esterification product and unreacted maleic anhydride;

[0024] (2) Monomer blending: 200.00 g of the first mixture prepared in step (1) was mixed with 1.50 g of sodium styrene sulfonate, and 150.00 g of water was added to dissolve it to obtain a comonomer mixture solution;

[0025] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, hydrogen peroxide aqueous solution (wherein hydrogen peroxi...

Embodiment 2

[0028] (1) Esterification reaction: 72.00g acrylic acid, 91.00g methacrylic acid, 200.00g polyethylene glycol monomethyl ether with a molecular weight of 800, 27.60g o-hydroxybenzoic acid, 38.00g p-hydroxymethylbenzoic acid, 1.60g Mix hydroquinone and 0.70g diphenylamine, under the protection of nitrogen, heat up to 70°C, then add 2.00g dinitrobenzoic acid and 2.00g ethylenediaminetetraacetic acid, heat up to 96°C, keep warm for 3 hours, during which Vacuumize or pass nitrogen with water to remove water, and after the reaction is finished, drop to room temperature to obtain the first mixture containing esterification product and unreacted acrylic acid and methacrylic acid;

[0029] (2) Monomer blending: Mix 200.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate and 1.00 g of sodium vinyl sulfonate, and add 150.00 g of water to dissolve it to obtain a copolymer monomer mixture solution;

[0030] (3) Copolymerization reaction: the above-mentioned c...

Embodiment 3

[0033](1) Esterification reaction: 72.00g acrylic acid, 163.00g fumaric acid, 200.00g polyethylene glycol monomethyl ether with a molecular weight of 1000, 18.30g p-hydroxyphenylacetic acid, 36.50g m-hydroxymethylbenzoic acid, 2.00g Mix hydroquinone and 1.00g of diphenylamine, under the protection of nitrogen, heat up to 67°C, then add 3.00g of periodic acid and 2.00g of ethylenediaminetetraacetic acid, heat up to 80°C, keep warm for 1.0h, use pumping Remove water by vacuum or through nitrogen with water, and cool to room temperature after the reaction to obtain the first mixture containing esterification product and unreacted acrylic acid and fumaric acid;

[0034] (2) Monomer blending: 200.00 g of the first mixture prepared in step (1) was mixed with 1.00 g of sodium styrene sulfonate and 1.50 g of sodium methacrylate sulfonate, and 150.00 g of water was added to dissolve it to obtain comonomer mixture solution;

[0035] (3) Copolymerization reaction: the above-mentioned co...

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Abstract

The invention discloses a preparation method of a low-sensitive concrete flowability stabilizer. The preparation method comprises the following steps: (1) esterification reaction; (2) monomer blending; (3) copolymerization reaction; (4) neutralization reaction. According to the preparation method disclosed by the invention, unsaturated carboxylic acid or unsaturated carboxylic acid anhydride and esterification products esterified by polyethylene glycol monomethyl ether and a compound A are used in copolymerization and synthesis of polycarboxylic acid, and a molecular chain structure having a benzene ring, an ester group and a carboxylic group at the same time is introduced in a molecular chain structure of the polycarboxylic acid; the carboxylic acid group and a sulfonic acid group which have an electrostatic repulsion effect and a polyether side chain and the benzene ring which have steric hindrance are introduced, so that a product has a higher initial water reducing rate.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a low-sensitivity concrete fluidity stabilizer. Background technique [0002] Polycarboxylate superplasticizer has become the most important product in the current concrete admixture market due to its advantages such as low dosage, high water reducing rate, good slump retention, strong molecular structure adjustability, and environmental protection. With the scarcity of natural high-quality sandstone and other material resources and the development of green building concepts, it has become a development trend to recycle low-quality aggregates such as construction waste, machine-made sand, and natural sandstone with high mud content and apply them to the field of concrete. At present, polycarboxylate water reducers on the market are generally highly sensitive to concrete materials, and are prone to various problems such as segregatio...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F212/14C08F220/06C08F228/02C08F222/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/06C08F212/14C08F220/06C08F222/02
Inventor 郭鑫祺蒋卓君官梦芹李祥河陈晓彬林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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