A kind of preparation method of highly adaptable concrete fluidity stabilizer

A concrete and adaptable technology, applied in the field of preparation of high-adaptability concrete fluidity stabilizer, can solve the problems of poor product stability, large difference in water reduction rate, general slump retention performance, etc. Good slump retention performance and good adaptability

Active Publication Date: 2020-12-29
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0003] CN 105754047A discloses a highly adaptable polycarboxylate water-reducer containing phosphoric acid ester and its preparation method. The polycarboxylate water-reducer prepared by the method has good dispersibility, but the slump retention performance is average, and the fluidity of the pulp is poor. Shows a loss of up to 90mm for 1h
[0004] CN 105712650A discloses a preparation method of a highly adaptable polycarboxylate water-reducer. The polycarboxylate water-reducer has a high water-reducing rate and has good adaptability to different materials, but it is suitable for different materials The difference in water reduction rate is large, the loss in half an hour is large, and the stability of the product is not good

Method used

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  • A kind of preparation method of highly adaptable concrete fluidity stabilizer
  • A kind of preparation method of highly adaptable concrete fluidity stabilizer

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] (1) Acylation esterification reaction: 346.00g maleic anhydride, 50.00g monoethanolamine, 30.40g o-hydroxybenzoic acid, 29.00g p-hydroxyphenylacetic acid, 1.00g hydroquinone and 1.00g phenothiazine were mixed, Under the protection of nitrogen, heat up to 65°C, then add 1.00g of periodic acid and 1.30g of dinitrobenzoic acid, heat up to 80°C, and keep warm for 3.0h. During this period, use vacuum or nitrogen with water to remove water, and react Down to room temperature after finishing, obtain the first mixture containing acylation product, esterification product and unreacted maleic anhydride;

[0027] (2) Monomer blending: Mix 8.00 g of the first mixture prepared in step (1), 1.20 g of sodium styrene sulfonate, and 100.00 g of APEG with a molecular weight of 2400, and add 90.00 g of water to dissolve it to obtain a copolymer monomer mixture solution;

[0028] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, hydrogen peroxide aqueous solut...

Embodiment 2

[0031] (1) Acylation esterification reaction: 144.00g acrylic acid, 172.00g methacrylic acid, 50.00g one isopropanolamine, 32.00g o-hydroxybenzoic acid, 45.00g o-hydroxymethylbenzoic acid, 0.60g hydroquinone Mix with 0.40g of diphenylamine, under the protection of nitrogen, heat up to 67°C, then add 1.00g of dinitrobenzoic acid and 2.00g of ethylenediaminetetraacetic acid, heat up to 90°C, keep the temperature for 2 hours, during this period use vacuum or ventilation The method of carrying water under nitrogen gas removes water, and after the reaction is completed, it is lowered to room temperature to obtain the first mixture containing acylated product, esterified product and unreacted acrylic acid and methacrylic acid;

[0032](2) Monomer blending: Mix 7.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate, 1.30 g of sodium vinyl sulfonate and 100.00 g of HPEG with a molecular weight of 2400, and add 90.00 g of water to dissolve it to obtain a com...

Embodiment 3

[0036] (1) Acylation esterification reaction: 109.00g acrylic acid, 290.00g fumaric acid, 50.00g monoethanolamine, 41.00g p-hydroxyphenylacetic acid, 46.00g p-hydroxymethylbenzoic acid, 2.00g hydroquinone and 2.00g Mix diphenylamine, under the protection of nitrogen, heat up to 68°C, then add 2.00g of periodic acid and 2.00g of ethylenediaminetetraacetic acid, heat up to 95°C, keep warm for 1.0h, during this period, use vacuum or nitrogen with water The method removes water, cools down to room temperature after completion of the reaction, and obtains the first mixture containing acylation product, esterification product and unreacted acrylic acid and fumaric acid;

[0037] (2) Monomer blending: mix 5.00 g of the first mixture prepared in step (1), 1.00 g of sodium styrene sulfonate, 0.50 g of sodium methacrylate sulfonate, and 100.00 g of TPEG with a molecular weight of 2400, and add 90.00g water makes it dissolve, obtains comonomer mixture solution;

[0038] (3) Copolymeriza...

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Abstract

The invention discloses a preparation method of a highly adaptable concrete fluidity stabilizer, which comprises the following steps: (1) acylation esterification reaction; (2) monomer blending; (3) copolymerization reaction; (4) neutralization reaction. The preparation method of the present invention simultaneously prepares a compound having an amide structure, an amino structure, a benzene ring, an ester group and a carboxyl compound by acylation and esterification of an unsaturated carboxylic acid or an unsaturated carboxylic acid anhydride with an acid-neutralized monohydric alcohol amine and compound A. Acid group unsaturated monomer, the acylation and esterification product is used in the copolymerization of polycarboxylic acid, and the polycarboxylic acid molecular chain structure is introduced with benzene ring, ester group, amide group, amino group and carboxyl group at the same time. molecular structure. Due to the introduction of carboxylic acid groups and sulfonic acid groups with electrostatic repulsion effect, polyether side chains and benzene rings with steric hindrance, the product has high dispersibility.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a highly adaptable concrete fluidity stabilizer. Background technique [0002] In recent years, with the construction of large-scale infrastructure projects in my country, especially the implementation of the national high-speed railway and highway network planning, the demand for polycarboxylate high-performance water reducers is increasing. Compared with traditional naphthalene-based superplasticizers, polycarboxylate superplasticizers have the advantages of low dosage, high water reducing rate, good slump retention, and environmental friendliness, and are generally recognized by the concrete engineering community. However, in the face of the differences in raw materials in the process of ready-mixed concrete, the differences in regional environments, as well as the limitations of technical personnel's understanding, usage habits ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F222/22C08F212/14C08F220/36C08F228/02C04B24/16
CPCC04B24/165C08F283/065C04B2103/0079C08F220/365C08F212/14C08F222/22
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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