Hyper-branched polycarboxylate high-efficiency water reducing agent and preparation method thereof

A high-efficiency water-reducing agent and polycarboxylate technology, which is used in the field of concrete admixtures in chemical building materials, can solve problems such as unstable product performance and poor cement adaptability, and achieve low slump loss and high water reduction rate. , good compatibility

Inactive Publication Date: 2009-11-18
厦门路桥翔通建材科技有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Polycarboxylate concrete high-performance water reducer is a research hotspot in various countries in the world in recent years. The earliest polycarboxylate high-efficiency water reducer is mainly composed of copolymers of olefins and unsaturated carboxylic acids. Later, exter...

Method used

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  • Hyper-branched polycarboxylate high-efficiency water reducing agent and preparation method thereof
  • Hyper-branched polycarboxylate high-efficiency water reducing agent and preparation method thereof
  • Hyper-branched polycarboxylate high-efficiency water reducing agent and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The hyperbranched polycarboxylate high-efficiency water reducer is a comb-shaped copolymer main chain obtained by polymerization of tert-butyl methacrylate, sodium methacrylate sulfonate, and allyl polyoxyethylene ether; Under the action of condensing agent CDI, ethylenediamine and acrylic acid are used as monomers and DMF is used as solvent to carry out condensation reaction, and the carboxylic acid superplasticizer with terminal carboxyl group synthesized above is connected by divergent method. branched hyperbranched polyamide.

[0030] Its preparation method is as follows: 9.48g of sodium methacryl sulfonate is made into a 3mol / L solution with DMF, and added in a four-necked bottle equipped with a stirring device, a spherical condenser, a thermometer and a constant pressure dropping funnel; 30.72g Tert-butyl methacrylate, 60g of allyl polyoxyethylene ether-1000 (APEG-1000), and 5.01g of azodicyanovaleric acid (ACVA) were prepared as a DMF mixed solution, and added to...

Embodiment 2

[0033] The hyperbranched polycarboxylate high-efficiency water reducer is obtained by polymerizing tert-butyl acrylate, sodium methacryl sulfonate, and allyl polyoxyethylene ether to obtain a comb-shaped copolymer main chain; and then using amidation reaction , under the action of condensing agent CDI, ethylenediamine and acrylic acid are used as monomers, DMF is used as solvent, and condensation reaction is carried out, and superbranched grafts are grafted on the main chain of the carboxylic acid water reducer with terminal carboxyl groups synthesized above. It can be obtained by melting polyamide.

[0034] Its preparation method is as follows: 9.48g of sodium methpropylene sulfonate is made into a 3mol / L solution with DMF, and added in a four-necked flask equipped with a stirring device, a spherical condenser, a thermometer and a constant pressure dropping funnel; 38.4g Tert-butyl acrylate, 60g of allyl polyoxyethylene ether-1000 (APEG-1000), and 5.41g of azodicyanovaleric a...

Embodiment 3

[0037] The hyperbranched polycarboxylate high-efficiency water reducer is a comb-shaped copolymer main chain obtained by polymerization of tert-butyl methacrylate, sodium methacrylate sulfonate, and allyl polyoxyethylene ether; Under the action of condensing agent CDI, ethylenediamine and methacrylic acid are used as monomers, DMF is used as solvent, and condensation reaction is carried out. grafted hyperbranched polyamides.

[0038] Its preparation method is as follows: 9.48g of sodium methacryl sulfonate is made into a 3mol / L solution with DMF, and added in a four-necked bottle equipped with a stirring device, a spherical condenser, a thermometer and a constant pressure dropping funnel; 30.72g Tert-butyl methacrylate, 90g of allyl polyoxyethylene ether-1000 (APEG-1000), and 8.49g of azodicyanovaleric acid (ACVA) were prepared as a DMF mixed solution, and added to a constant pressure dropping funnel.

[0039] After passing nitrogen into the four-neck flask for 10 minutes, st...

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Abstract

The invention relates to a hyper-branched polycarboxylate high-efficiency water reducing agent and a preparation method thereof. The water reducing agent is prepared by polymerizing one of tert-butyl acrylate and methyl tert-butyl acrylate with sodium methyl-acryl sulfonate and allyl polyethenoxy ether to form a copolymer main chain, and then performing condensation polymerization on one of acrylic acid and methacrylic acid with ethylene diamine to form a hyper-branched polyamide structure which is grafted to two ends of the main chain. The preparation method comprises the following steps: (1) preparing the sodium methyl-acryl sulfonate into solution with DMF, and heating the solution in a nitrogen atmosphere; (2) dissolving the other two monomers and an initiating agent into the DMF to prepare mixed solution, and dripping the mixed solution into the step (1) to react for 1 to 20 hours; (3) adding a condensating agent CDI after the reaction and performing condensation reaction by using N-methyl morpholine as an organic base, the ethylene diamine and the acrylic acid as the monomers and the DMF as a solvent; and (4) performing vacuum distillation to remove the residual monomers and the solvent, and refluxing for 2 to 5 hours by using methylene chloride solution of trifluoroacetic acid to obtain the water reducing agent. The hyper-branched polycarboxylate water reducing agent has the advantages of low admixture, high water reducing rate, small slump loss, good compatibility with cement, no corrosivity to steel bars, strong frost resistance and the like.

Description

technical field [0001] The invention relates to a hyperbranched polycarboxylate high-efficiency water reducer and a preparation method thereof, belonging to the technical field of concrete admixtures in chemical building materials. Background technique [0002] At present, the requirements for high-performance concrete are not only high strength, but more attention is paid to the long-term and ultra-long-term durability of this structural material, as well as compactness, stability and excellent construction performance on the basis of high strength. In the technical measures for preparing high-performance concrete, in addition to the high requirements for cement and aggregate, the most important feature is the use of ultra-fine powder admixtures (ground slag, silica fume, powder coal ash, etc.) and chemical admixtures, especially high-performance water-reducing agents with high-efficiency water reduction, proper air-entrainment and reduced slump loss over time. The high-ef...

Claims

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Application Information

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IPC IPC(8): C04B24/26C08G65/48C04B103/30
CPCC04B2103/601C04B24/2694C04B2103/302C04B2103/61C04B2103/0059
Inventor 寿崇琦徐小韦初永杰林栋杨文徐磊
Owner 厦门路桥翔通建材科技有限公司
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