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A kind of preparation method of low heat of hydration early-strength polycarboxylate superplasticizer

A thermal early-strength type, polycarboxylic acid technology, applied in the field of construction admixtures, can solve the problems of small increase, influence, and no mention of the later strength of cement, so as to prevent cracking, improve durability, double bond The effect of high retention rate

Active Publication Date: 2020-03-06
KZJ NEW MATERIALS GROUP CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The comparison found that the early strength has not been greatly improved, and there is still room for further improvement, but the technical solution does not mention whether it will affect the later strength of the cement.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Acylation esterification reaction: 451.00g maleic anhydride, 7.50g monoethanolamine, 28.00g urea, 40.00g (4-hydroxyphenyl) phosphoric acid, 60.00g (2-hydroxyphenyl) phosphoric acid, 3.00g p- Mix hydroquinone and 2.00g phenothiazine, under the protection of nitrogen, heat up to 65°C, then add 2.00g periodic acid and 4.00g dinitrobenzoic acid, keep warm for 2.0h, during which 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 acylated esterification product and unreacted maleic anhydride;

[0026] (2) Monomer blending: 12.00 g of the first mixture prepared in step (1), 3.00 g of sodium allyl sulfonate, and 120.00 g of TPEG with a molecular weight of 2400 were mixed, and 70.00 g of water was added to dissolve it to obtain comonomer mixture solution;

[0027] (3) Copolymerization reaction: the above-mentioned comonomer mixture solution, hydrogen peroxide aqueous solu...

Embodiment 2

[0030](1) Acylation esterification reaction: 86.00g acrylic acid, 12.00g diethanolamine, 164.00g methacrylic acid, 32.00g urea, 40.00g (3-hydroxymethylphenyl) phosphoric acid, 60.00g (4-hydroxymethylphenyl) Phenyl)phosphoric acid, 1.00g of hydroquinone and 2.00g of diphenylamine were mixed, under the protection of nitrogen, the temperature was raised to 70°C, and then 1.00g of dinitrobenzoic acid and 3.00g of ethylenediaminetetraacetic acid were added, and the reaction was kept for 3h. During the period, the water is removed by vacuumizing or nitrogen-carrying water, and after the reaction is completed, it is lowered to room temperature, and the first mixture containing the acylated esterification product and unreacted acrylic acid and methacrylic acid is obtained;

[0031] (2) Monomer blending: Mix 12.00 g of the first mixture prepared in step (1), 1.00 g of sodium allyl sulfonate, 1.00 g of sodium vinyl sulfonate and 112.00 g of TPEG with a molecular weight of 2400, and add 7...

Embodiment 3

[0035] (1) Acylation esterification reaction: 94.00g acrylic acid, 232.00g fumaric acid, 16.50g triethanolamine, 40.00g urea, 40.00g (3-hydroxyphenyl) phosphoric acid, 60.00g (4-hydroxybenzyl) Phosphoric acid, 3.00g of hydroquinone and 3.00g of phenothiazine were mixed, under the protection of nitrogen, the temperature was raised to 75°C, then 2.00g of periodic acid and 1.00g of ethylenediaminetetraacetic acid were added, and the reaction was kept for 2.0h. Vacuum or the method of passing 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 fumaric acid is obtained;

[0036] (2) Monomer blending: 12.00 g of the first mixture prepared in step (1), 2.00 g of sodium styrene sulfonate, 2.00 g of sodium methacrylate sulfonate and 135.00 g of HPEG with a molecular weight of 2400 were mixed, and 70.00 g of water to dissolve it to obtain a...

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PUM

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Abstract

The invention discloses a preparation method of a low hydration heat early strength polycarboxylic acid water reducer. The method comprises the following steps: (1) acylation esterification reaction;(2) monomer blending; (3) copolymerization reaction; (4) neutralization reaction. Water reducer molecule prepared through the method contains amide groups, and is applied to concrete, and the amide groups can be gradually hydrolyzed in the condition of concrete alkaline condition and release urea and alcohol amine with early strength effect, so that concrete configured by the water reducer has good one-day strength, and the 28-day strength is not affected.

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-heat-of-hydration early-strength polycarboxylate water-reducer. Background technique [0002] Polycarboxylate superplasticizer, as a new type of high-performance superplasticizer, has low dosage, high water reducing rate, good slump retention, small shrinkage, relatively good adaptability to cement and admixtures, and enhanced effect Obviously, a series of outstanding performance. At the same time, the production process is environmentally friendly and has been widely used in various engineering fields. With the rapid development of my country's economy, people have put forward higher requirements for concrete, thus increasing the requirements for admixtures, and it is necessary to ensure that the concrete has excellent construction performance, durability and concrete construction performance. [0003] With the acceleration...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F230/02C08F2/38C08F4/40C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F2/38C08F4/40C08F283/065C08F230/02
Inventor 郭鑫祺蒋卓君官梦芹陈晓彬李祥河林添兴麻秀星
Owner KZJ NEW MATERIALS GROUP CO LTD
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