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

A high-efficiency water reducer and polycarboxylate technology, which is applied in the field of concrete admixtures in chemical building materials, can solve problems such as unstable product performance and poor cement adaptability, and achieve reduced drying shrinkage and small slump loss , Improve the effect of steric hindrance effect

Inactive Publication Date: 2012-10-10
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, external improvement and copolymerization technology There are many breakthrough improvements on the market, but the polycarboxylate superplasticizers in our market generally have problems such as poor adaptability to various cements and unstable product performance. Modification is imperative

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The hyperbranched polycarboxylate superplasticizer is obtained by polymerizing tert-butyl methacrylate, sodium methacrylate sulfonate and allyl polyoxyethylene ether to obtain the main chain of the comb-shaped copolymer; Under the action of the condensing agent CDI, ethylenediamine and acrylic acid are used as monomers, DMF is used as a solvent, and a condensation reaction is carried out. The branched hyperbranched polyamide is obtained.

[0029] Its preparation method is as follows: 9.48g of sodium methacrylate sulfonate is made into a 3mol / L solution with DMF, and added to a four-necked flask equipped with a stirring device, a spherical condenser, a thermometer and a constant pressure dropping funnel; 30.72g of Tert-butyl methacrylate, 60 g of allyl polyoxyethylene ether-1000 (APEG-1000), and 5.01 g of azodicyanovaleric acid (ACVA) were prepared into a DMF mixed solution, which was added to a constant pressure dropping funnel.

[0030] After passing nitrogen into the...

Embodiment 2

[0032] The hyperbranched polycarboxylate superplasticizer is obtained by polymerizing tert-butyl acrylate, sodium methacrylate sulfonate, and allyl polyoxyethylene ether to obtain the main chain of the comb-shaped copolymer; and then utilizes amidation reaction , under the action of the condensing agent CDI, ethylenediamine and acrylic acid are used as monomers, DMF is used as a solvent, and a condensation reaction is carried out. Polyamide can be obtained.

[0033] Its preparation method is as follows: 9.48g of sodium methacrylate sulfonate is made into a 3mol / L solution with DMF, and added to 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, 60 g of allyl polyoxyethylene ether-1000 (APEG-1000), and 5.41 g of azodicyanovaleric acid (ACVA) were prepared into a DMF mixed solution, which was added to a constant pressure dropping funnel.

[0034]After passing nitrogen into...

Embodiment 3

[0036] The hyperbranched polycarboxylate superplasticizer is obtained by polymerizing tert-butyl methacrylate, sodium methacrylate sulfonate and allyl polyoxyethylene ether to obtain the main chain of the comb-shaped copolymer; Under the action of the condensing agent CDI, ethylenediamine and methacrylic acid are used as monomers, and DMF is used as a solvent to carry out a condensation reaction. It can be obtained by grafting hyperbranched polyamide.

[0037] Its preparation method is as follows: 9.48g of sodium methacrylate sulfonate is made into a 3mol / L solution with DMF, and added to a four-necked flask equipped with a stirring device, a spherical condenser, a thermometer and a constant pressure dropping funnel; 30.72g of Tert-butyl methacrylate, 90 g of allyl polyoxyethylene ether-1000 (APEG-1000), and 8.49 g of azodicyanovaleric acid (ACVA) were prepared into a DMF mixed solution, which was added to a constant pressure dropping funnel.

[0038] After passing nitrogen i...

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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 usingN-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 andthe 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 hasthe 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 superplasticizer 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 concerned about the long-term and ultra-long-term durability of this structural material, and on the basis of high-strength, it has dense, stable and excellent construction performance. In the technical measures for preparing high-performance concrete, in addition to higher requirements for cement and aggregates, the most important feature is the use of ultra-fine powder admixtures (ground slag, silica fume, powder, etc.) in the configuration process. Coal ash, etc.) and chemical admixtures, especially high-performance water-reducing agents with high-efficiency water-reducing, proper air-entraining and reducing slump loss over time. Su...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C04B24/26C08G65/48C04B103/30
CPCC04B2103/601C04B24/2694C04B2103/302C04B2103/61C04B2103/0059
Inventor 肖尾俭寿崇琦
Owner 厦门路桥翔通建材科技有限公司
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