Retarding and plastic-retaining type polycarboxylate superplasticizer and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in its preparation, and has the field of polycarboxylate water reducing agent with retarding plasticity and plasticity, which can solve problems such as difficulties in retarding plasticity and plasticity, and achieve improvement in retarding plasticity and plasticity. Effect and effect of water reduction effect

Active Publication Date: 2014-02-05
SHANGHAI TAIJIE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In the past, the long side chains of polycarboxylate superplasticizers were mostly modified polyether (TPEG) or polyether esterification products. Although the performance in all aspects is ideal, it is difficult to further improve the performance of retarding and plastic retention.

Method used

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  • Retarding and plastic-retaining type polycarboxylate superplasticizer and preparation method thereof
  • Retarding and plastic-retaining type polycarboxylate superplasticizer and preparation method thereof
  • Retarding and plastic-retaining type polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0094] step 1

[0095] Mix 400g of polyaspartic acid (number-average molecular weight 4000) and 20g of methacrylic acid in water, stir and heat up to 45°C, and add 20g of DMAP solution (1wt%) and 5g of EDC solution (1wt%) dropwise at a constant speed using a constant-flow pump , the dropping time is 30-60 minutes, and the reaction is continued for 60-120 minutes after the dropping is completed. Carboxylic acid amidated monomers of polyaspartic acid were synthesized. In order to improve the reaction yield, a small amount of pyridine can be added as an acid-binding agent.

[0096] The prepared product was analyzed by high-performance liquid chromatography, and the monomer conversion rate was greater than 95%. When the reaction temperature was high, a suitable amount of hydroquinone and other polymerization inhibitors could be added to avoid self-polymerization of unsaturated carboxylic acid monomers.

[0097] step 2

[0098] Add 200g of the amidation product of polyasparti...

Embodiment 2

[0101] step 1

[0102] Add 300g of polyaspartic acid with a molecular weight of 3000 and 15g of acrylic acid into the reaction vessel, add an appropriate amount of distilled water, stir and raise the temperature to 45°C, and start to add 1-(3-dimethylaminopropyl)-3-ethylcarbodiethylene dropwise 20g of amine (EDC) solution and 5g of 4-dimethylaminopyridine (DMAP) solution, the solution concentration is 1wt%, the dropwise addition time is 30-60min, continue to react for 60min-120min after dropping, stop heating.

[0103] The polyaspartic acid amidation products were analyzed by infrared spectroscopy. Polyaspartic at 760cm -1 There is an absorption peak at the N-H bond in the secondary amine group, which is the characteristic peak of the out-of-plane bending vibration of the N-H bond, while in the polyaspartic acid amidation product, this peak basically disappears, which proves that the polyaspartic acid and the carboxyl group have amide Chemical reaction, and the reaction is ...

Embodiment 3

[0107] step 1

[0108] Add 400g of polyaspartic acid with a molecular weight of 4000 and 20g of methacrylic acid into the reaction vessel, add an appropriate amount of distilled water, stir and raise the temperature to 45°C, and start to add 1-(3-dimethylaminopropyl)-3-ethyl carbon Diimine (EDC) solution 20g and 4-dimethylaminopyridine (DMAP) solution 5g, the solution concentration is 1wt%, the dropwise addition time is 30-60min, continue to react for 60min-120min after the dropwise addition, stop heating.

[0109] step 2

[0110] Add 200g of the above-prepared amidation product of polyaspartic acid and allyl polyethylene glycol (APEG) with a molecular weight of 2400 into the reaction vessel, add 200g of distilled water, stir and heat up to 70-80°C. Add 55g of maleic anhydride, and start dropping 30g (10wt%) of the initiator sodium persulfate aqueous solution and 40g of the 5wt% solution of the chain transfer agent mercaptoacetic acid at the same time. The dropping time is...

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Abstract

The invention provides polyaspartic acid containing unsaturated double bond, a retarding and plastic-retaining type polycarboxylate superplasticizer and a preparation method thereof. The polyaspartic acid and unsaturated carboxylic acid containing non-conjugated C=C double bond perform an amidation reaction to polyaspartic acid containing unsaturated double bond shown in the structural formula (I); the polyaspartic acid and a selected unsaturated monomer perform addition and copolymerization reaction to obtain a retarding plastic-retaining type polycarboxylate superplasticizer shown in the structural formula (II). Experiment results prove that the retarding and plastic-retaining type polycarboxylate superplasticizer can be more effectively used for retarding formation of an ettringite structure in the cement hydration process to achieve a longer retarding time and better plastic retaining performance, so that the performance maintaining time of blended concrete can be prolonged.

Description

technical field [0001] The invention relates to a high-performance concrete water-reducer, in particular to a polycarboxylate water-reducer with slow-setting and plastic-retaining properties, and a preparation method thereof. Background technique [0002] Concrete water reducer (also known as superplasticizer, Superplasticizer) refers to an admixture that can reduce the amount of mixing water and increase the strength of concrete under the condition of the workability of concrete and the amount of cement unchanged; , complexation, electrostatic repulsion or three-dimensional repulsion, etc. to hinder or destroy the flocculation structure of cement particles, so as to save the amount of cement while ensuring the workability and strength of concrete. [0003] Traditional water reducing agents can be divided into lignosulfonic acids, polycyclic aromatic salts and water-soluble resin sulfonic acids according to the composition materials. For example, patent CN101665337A disclose...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G73/10C08F290/06C04B24/28C04B103/30
Inventor 朱伟亮
Owner SHANGHAI TAIJIE CHEM
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