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Long-chain polycarboxylic acid water reducing agent

A technology of chain polycarboxylic acid and water-reducing agent, applied in the field of concrete admixtures, can solve the problems of complex production process of water-reducing agent, low cement adaptability, low water-reducing rate, etc. The effect of small loss of degree and improved early and late strength

Inactive Publication Date: 2014-09-10
RIZHAO PORT GRP LANSHAN PORT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0007] In order to solve the above-mentioned technical problems, the purpose of the present invention is to overcome the problems of polycarboxylate-based water-reducing agent production process is too complex, high cost, low water-reducing rate and low adaptability to cement, etc., and provide a simple process, low cost , high-performance, green and environmentally friendly polycarboxylate high-efficiency water reducer

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0024] Add 50g of water into a 250mL four-neck flask equipped with a thermometer, agitator, dropping funnel, and condenser, and raise the temperature in the water bath to 80°C; dissolve each monomer in 3 times the water according to the ratio as the dripping liquid I , wherein: allyl polyethylene glycol accounts for 50% of the total mass of monomers, polyethylene glycol monomethyl ether methacrylate accounts for 10% of the total mass of monomers, acrylic acid accounts for 30% of the total mass of monomers, propylene Amide accounts for 10% of the total mass of the monomer; ammonium persulfate is taken according to the amount and dissolved in water to form a solution with a mass fraction of 7.2% as the dripping liquid II, wherein the amount of ammonium persulfate accounts for 2.5% of the total mass of the monomer; Add dropwise solution I and dropwise solution II dropwise to the flask at the same time, and the dropping time is controlled at 4 hours; after the dropwise addition is ...

Embodiment 2

[0026] Add 50g of water into a 250mL four-neck flask equipped with a thermometer, agitator, dropping funnel, and condenser, and raise the temperature in the water bath to 80°C; dissolve each monomer in 3 times the water according to the ratio as the dripping liquid I , wherein: allyl polyethylene glycol accounts for 30% of the total mass of the monomer, polyethylene glycol monomethyl ether methacrylate accounts for 20% of the total mass of the monomer, acrylic acid accounts for 40% of the total mass of the monomer, propylene Amide accounts for 10% of the total mass of the monomer; ammonium persulfate is taken according to the amount and dissolved in water to form a solution with a mass fraction of 7.2% as the dripping liquid II, wherein the amount of ammonium persulfate accounts for 2.5% of the total mass of the monomer; Add dropwise solution I and dropwise solution II dropwise to the flask at the same time, and the dropping time is controlled at 4 hours; after the dropwise add...

Embodiment 3

[0028] Add 50g of water into a 250mL four-neck flask equipped with a thermometer, agitator, dropping funnel, and condenser, and raise the temperature in the water bath to 80°C; dissolve each monomer in 3 times the water according to the ratio as the dripping liquid I , wherein: allyl polyethylene glycol accounts for 40% of the total mass of the monomer, polyethylene glycol monomethyl ether methacrylate accounts for 18% of the total mass of the monomer, acrylic acid accounts for 37% of the total mass of the monomer, propylene Amide accounts for 5% of the total mass of the monomer; ammonium persulfate is taken according to the amount and dissolved in water to form a solution with a mass fraction of 7.2% as the dripping solution II, wherein the amount of ammonium persulfate accounts for 2.5% of the total mass of the monomer; Add dropwise solution I and dropwise solution II dropwise to the flask at the same time, and the dropping time is controlled at 4 hours; after the dropwise ad...

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Abstract

The invention relates to a long-chain polycarboxylic acid water reducing agent which is prepared by adopting ammonium persulfate as an initiator and copolymerizing monomers of allyl polyethylene glycol, polyethylene glycol monomethyl ether methacrylate, acrylic acid and acrylamide, wherein allyl polyethylene glycol accounts for 30-50% of the total monomer mass, polyethylene glycol monomethyl ether methacrylate accounts for 5-20% of the total monomer mass, acrylic acid accounts for 20-40% of the total monomer mass, acrylamide accounts for 1-10% of the total monomer mass, and ammonium persulfate accounts for 2.5-10.0% of the total monomer mass. The preparation of the polycarboxylic acid water reducing agent adopts the free radical polymerization method, takes water as a solvent, has simple and easily controlled process, and has no industrial three wastes; and moreover, the product has excellent properties, has the advantages of low mixing amount, high water reducing rate, small slump degree loss, and strong adaptability to cement, and substantially improves early and later strength of concrete.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, more specifically, the invention relates to a long-chain polycarboxylate water reducer. Background technique [0002] With the vigorous development of my country's infrastructure construction, the performance of all aspects of concrete necessary for infrastructure construction is also constantly improving, and at the same time, the requirements for concrete water reducing agents are also getting higher and higher. Polycarboxylate superplasticizer is the third generation of high-performance superplasticizer, which has the characteristics of low dosage, high water reducing rate, small slump loss, and good adaptability to cement. Polycarboxylate water reducer can greatly increase the amount of mixed materials such as fly ash and mineral powder. It is green and environmentally friendly, can greatly save cement, and has the advantages of high-strength and ultra-high-strength concrete. It i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F291/06C08F220/06C08F220/56C04B24/32C04B103/30
Inventor 尚金瑞马先彬高明张孝波李华山金振华徐三华范开拓程永荣王细美
Owner RIZHAO PORT GRP LANSHAN PORT
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