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A kind of preparation method of polycarboxylate superplasticizer with low heat of hydration

A technology of thermal polycarboxylic acid and water reducing agent, which is applied in the field of construction admixtures, can solve problems such as high temperature stress and temperature cracks, and achieve the effects of improving early strength, preventing cracking problems, and saving production costs

Active Publication Date: 2020-05-08
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At the same time, due to the heat dissipation outside the concrete, a temperature gradient is formed between the inside and outside of the concrete, resulting in a large temperature stress, resulting in temperature cracks

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] (1) Acylation esterification reaction: 282.00g maleic anhydride, 7.70g monoethanolamine, 80.00g (2-hydroxyphenyl) phosphoric acid, 20.00g (3-hydroxyphenyl) phosphoric acid, 1.00g hydroquinone and Mix 0.80g of phenothiazine, raise the temperature to 65°C under the protection of nitrogen, then add 1.00g of periodic acid and 2.00g of dinitrobenzoic acid, keep warm for 3.0h, and remove it by vacuuming or nitrogen with water. Water, down to room temperature after the end of the reaction, to obtain the first mixture containing acylated esterification product and unreacted maleic anhydride;

[0025] (2) Monomer blending: Mix 10.00 g of the first mixture prepared in step (1), 3.00 g of sodium styrene sulfonate, and 100.00 g of TPEG with a molecular weight of 2400, and add 100.00 g of water to dissolve it to obtain a copolymer monomer mixture solution;

[0026] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, hydrogen peroxide aqueous solution (whe...

Embodiment 2

[0029] (1) Acylation esterification reaction: 104.00g acrylic acid, 86.00g methacrylic acid, 11.50g diethanolamine, 60.00g (2-hydroxymethylphenyl) phosphoric acid, 40.00g (3-hydroxymethylphenyl) phosphoric acid , 0.60g of hydroquinone and 1.00g of diphenylamine were mixed, under the protection of nitrogen, the temperature was raised to 70°C, and then 2.00g of dinitrobenzoic acid and 2.00g of ethylenediaminetetraacetic acid were added, and the reaction was kept for 2 hours, during which time a vacuum was used Or the method of purging nitrogen with water to remove water, after the reaction is completed, it is lowered to room temperature, and the first mixture containing acylated esterification product and unreacted acrylic acid and methacrylic acid is obtained;

[0030](2) Monomer blending: Mix 10.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate, 3.00 g of sodium vinyl sulfonate and 112.00 g of APEG with a molecular weight of 2400, and add 100.00 g...

Embodiment 3

[0034] (1) Acylation esterification reaction: 108.00g acrylic acid, 209.00g fumaric acid, 16.50g triethanolamine, 50.00g (4-hydroxyphenyl) phosphoric acid, 50.00g (4-hydroxybenzyl) phosphoric acid, 2.00g Mix hydroquinone and 1.00g phenothiazine, under the protection of nitrogen, heat up to 75°C, then add 2.00g periodic acid and 5.00g ethylenediaminetetraacetic acid, keep warm for 2.0h, during which vacuum or nitrogen The water-carrying method is used to remove water, and after the reaction is completed, it is lowered to room temperature to obtain the first mixture containing acylated esterification product and unreacted acrylic acid and fumaric acid;

[0035] (2) Monomer blending: 10.00 g of the first mixture prepared in step (1), 2.00 g of sodium styrene sulfonate, 2.90 g of sodium methacrylate sulfonate and 206.00 g of HPEG with a molecular weight of 2400 were mixed, and 100.00 g of water to dissolve it to obtain a comonomer mixture solution;

[0036] (3) Copolymerization r...

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PUM

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Abstract

The invention discloses a preparation method of a low-hydration-heat polycarboxylate water reducing agent. Unsaturated carboxylic acid or unsaturated carboxylic acid anhydride performs acidylation andesterification with alcohol amine and a compound A to simultaneously prepare unsaturated monomers with acidamide groups, unsaturated monomers with amino groups and unsaturated monomers with benzene rings and phosphate groups; then, co-polymerization is performed by excessive unsaturated carboxylic acid or unsaturated carboxylic acid anhydride, unsaturated sulphonate and polyether big monomers during acidylation and esterification; acylamide groups, amino groups, phosphate groups, carboxylate groups, sulphonate groups, polyether lateral chains and benzene rings are introduced into molecular structures, so that the product has a high initial water reducing rate. The molecular structures of the water reducing agent prepared by the preparation method comprise ester groups, phenyls and phosphate groups; the ester groups hydrolyze under the basic condition of the concrete; carboxyls with the water reducing function and hydroxy phenyl phosphate groups with the hydration heat reducing function are gradually released; the concrete hydration heat can be effectively reduced.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a polycarboxylate water reducer with low heat of hydration. Background technique [0002] Since the research and development of high-efficiency superplasticizers, they have gradually developed through lignin sulfonate, naphthalene and melamine series, and now they are mainly represented by polycarboxylic acid series. Compared with traditional water reducers, polycarboxylate high-efficiency water reducers are mainly composed of carboxyl groups (-COOR) and polyoxyethylene grafted chains (-OC 2 h 4 - Composed of comb copolymers, these polar groups with strong affinity for water provide dispersibility and dispersion retention to cement particles through adsorption, electrostatic repulsion, wetting and other surface activities, even at low water-binder ratios It can show good dispersing ability, greatly improving the fluidity and fluid...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F230/02C08F212/14C08F228/02C04B24/26C04B103/30
CPCC04B24/246C04B2103/30C08F283/065C08F230/02C08F212/14C08F228/02
Inventor 官梦芹郭鑫祺蒋卓君李祥河陈晓彬
Owner KZJ NEW MATERIALS GROUP CO LTD
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