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A highly adaptable polycarboxylate water reducer and its preparation method

An adaptive polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of poor slurry stability, inability to copolymerize, and poor workability, etc., and achieve the effects of reducing poor water retention, improving stability, and improving stability

Active Publication Date: 2020-06-23
武汉优城科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The design concept is mainly to shield the adsorption of polycarboxylate superplasticizer by clay through quaternary ammonium salt and phosphonic acid groups, but aminotrimethylphosphonic acid cannot be copolymerized into polycarboxylate because it does not contain unsaturated carbon-carbon bonds. On the main chain, it is no different from compounding
[0005] The current polycarboxylate superplasticizers on the market are used in sand and gravel materials with high mud content, and there will be problems such as poor workability, severe bleeding, and poor slurry stability. Therefore, it is urgent to design a high-adaptability Type polycarboxylate superplasticizer to solve the above problems

Method used

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  • A highly adaptable polycarboxylate water reducer and its preparation method
  • A highly adaptable polycarboxylate water reducer and its preparation method
  • A highly adaptable polycarboxylate water reducer and its preparation method

Examples

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Embodiment 1

[0044] This example provides a highly adaptable polycarboxylate water reducer and its preparation method. Add 8 parts of nitrilotriacetic acid and 9.6 parts of trifluoromethanesulfonic acid into the reactor, raise the temperature to 30°C, and within 2 hours Add 3.6 parts of phosphorous acid into the reactor dropwise at a uniform speed, control the temperature during the dropping process to rise at 35°C / h, and keep it warm for 0.5h to obtain 2-(bis(phosphonomethyl)amino)acetic acid, 2,2'- The phosphonated product of ((phosphonomethyl) amino) diacetic acid and nitrilo trimethylene phosphonic acid; then 2.4 parts of isobutenol were added to the reactor, 0.15 parts of concentrated sulfuric acid, 0.012 parts of hydroquinone and 0.0021 parts of phenothiazine, heated up to 120°C, passed N 2 , and reacted for 4 hours to obtain the unsaturated ester monomer C containing phosphonic acid groups, which was taken out for later use; 100 parts of isobutylene alcohol polyoxyethylene ether (mole...

Embodiment 2

[0046] This example provides a highly adaptable polycarboxylate water reducer and its preparation method. Add 4.94 parts of nitrilotriacetic acid and 2.47 parts of trifluoromethanesulfonic acid into the reactor, raise the temperature to 30°C, and within 2 hours Add 4.94 parts of phosphorous acid into the reactor dropwise at a constant speed, control the temperature during the dropping process to rise at 35°C / h, keep it warm for 0.5h, and obtain 2-(bis(phosphonomethyl)amino)acetic acid, 2,2'- The phosphonated product of ((phosphonomethyl) amino) diacetic acid and nitrilo trimethylene phosphonic acid; Phenol and 0.003 parts of phenothiazine, the temperature was raised to 120°C, and N 2 , and reacted for 4 hours to obtain unsaturated ester monomers containing phosphonic acid groups, which were taken out for later use; 100 parts of prenol polyoxyethylene ether (molecular weight 2400) and several parts of water were put into the reactor to dissolve completely , mix and dissolve th...

Embodiment 3

[0048] This example provides a highly adaptable polycarboxylate water reducer and its preparation method. Add 2.87 parts of nitrilotriacetic acid and 5.7 parts of trifluoromethanesulfonic acid into the reactor, raise the temperature to 30°C, Add 8.6 parts of phosphinic acid dropwise to the reactor at a constant speed, control the temperature during the dropping process to rise at 35°C / h, keep it warm for 0.5h, and obtain 2-(bis(phosphonomethyl)amino)acetic acid, 2,2 The phosphonated product of '-((phosphonomethyl) amino) diacetic acid and nitrilo trimethylene phosphonic acid; then 2.4 parts of isobutenol were added to the reactor, 0.24 parts of concentrated sulfuric acid, 0.04 parts of terephthalic acid Phenol and 0.008 parts of phenothiazine, the temperature was raised to 120°C, and N 2 , and reacted for 4 hours to obtain the unsaturated ester monomer C containing phosphonic acid groups, which was taken out for later use; 100 parts of isobutylene alcohol polyoxyethylene ether...

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Abstract

The invention discloses a high-adaptability polycarboxylate superplasticizer and a preparation method thereof. The high-adaptability polycarboxylate superplasticizer is synthesized by free radical polymerization of a polyether macromonomer A, an unsaturated carboxylic acid monomer B, and a phosphonyl group containing unsaturated ester monomer C in a water solution, wherein the phosphonyl group containing unsaturated ester monomer C is prepared by esterifying a reaction product of nitrilotriacetic acid and phosphorous acid and isomeric unsaturated alcohol. Compared with a polycarboxylate superplasticizer with a traditional structure, the high-adaptability polycarboxylate superplasticizer is high in adaptability to raw concrete materials and outstanding in water reduction effect and delayedcoagulation effect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a highly adaptable polycarboxylate water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer has the advantages of low dosage, high water reducing rate, and strong slump retention ability. At the same time, its molecular structure is flexible and highly designable, which can meet the needs of different construction projects. However, due to the complex and changeable mineral components of cement clinker, uneven grades of sand and gravel materials, differences in the performance of mineral admixtures, concrete mix ratios and operating environments, polycarboxylate superplasticizers sometimes have poor adaptability. , which restricts its application in concrete. [0003] Chinese patent No. CN201710119909.2 discloses a preparation method of a polycarboxylic acid superplasticizer containing a phosphonic aci...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F230/02C08F220/06C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F230/02C08F220/06
Inventor 代柱端董耀武陈健周晓阳
Owner 武汉优城科技有限公司
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