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Early strength polycarboxylic acid water reducing agent and preparation method thereof, and cement admixture

A technology of polycarboxylate and early-strength type, which is applied in cement admixture, early-strength polycarboxylate superplasticizer and its preparation field, can solve the problems of few mature products and single varieties, and achieve short production cycle, The effect of low cost and reduced production energy consumption

Active Publication Date: 2016-07-20
联泓新材料科技股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, the variety of early-strength polycarboxylate superplasticizers is still relatively single, and the multifunctional research on the performance of polycarboxylate superplasticizers from the design of polymer molecular structure is still in its infancy. The synthesis and development of carboxylic acid-based water reducers are still in the exploratory stage, and there are few mature products

Method used

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  • Early strength polycarboxylic acid water reducing agent and preparation method thereof, and cement admixture
  • Early strength polycarboxylic acid water reducing agent and preparation method thereof, and cement admixture
  • Early strength polycarboxylic acid water reducing agent and preparation method thereof, and cement admixture

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0058] Into a glass reactor equipped with a thermometer, stirrer, dropping funnel, and reflux condenser were charged 100 parts of deionized water, 92 parts of monomer A (diallylamine ethoxylate with a molecular weight of 2400) and 184 parts of Monomer C (3-methyl-3-butenyl polyoxyethylene ether TPEG with a molecular weight of 2400, and then heated to 65°C, and then 28 parts of acrylic acid and 4.1 parts of methyl alcohol were added dropwise within 3 hours and 3.5 hours, respectively. 40% mixed aqueous solution of sodium allyl sulfonate and 1.2 parts of sodium hypophosphite and 3.8% aqueous solution of 2 parts of ammonium persulfate. Afterwards, the temperature was kept at 65° C. for 1 hour to complete the polymerization reaction, and then the resulting reaction mixture was cooled to no more than 50° C., and then neutralized with 41 parts of 30% aqueous sodium hydroxide solution to adjust the pH to 5-7, thereby obtaining an aqueous copolymer solution for cement admixtures. The w...

Embodiment 2

[0060] Add 100 parts of deionized water, 92 parts of monomer A (diallylamine polyoxyethylene polyoxypropylene ether with a molecular weight of 2400 and 184 parts of monomer C (2-methyl-allyl polyoxyethylene ether HPEG with a molecular weight of 2400), and then heated to 65°C, then added dropwise 28 parts of acrylic acid and 4.1 parts of Sodium methallyl sulfonate and 1.2 parts of sodium hypophosphite in 40% mixed aqueous solution and 2 parts of ammonium persulfate in 3.8% aqueous solution.Then keep the temperature at 65°C for 1 hour to complete the polymerization reaction, then the resulting reaction mixture Cool to not more than 50°C, and then neutralize with 41 parts of 30% aqueous sodium hydroxide solution to adjust the pH to 5-7, thereby obtaining an aqueous copolymer solution for cement admixture, the weight average molecular weight of the copolymer being 28100.

Embodiment 3

[0062] Into a glass reactor equipped with a thermometer, stirrer, dropping funnel, and reflux condenser were charged 100 parts of deionized water, 92 parts of monomer A (diallylamine polyoxyethylene ether with a molecular weight of 5000), and 184 parts of Monomer C (3-methyl-3-butenyl polyoxyethylene ether TPEG with a molecular weight of 2400), and then heated to 65°C, then added dropwise 28 parts of acrylic acid and 4.1 parts of Sodium methallyl sulfonate and 1.2 parts of a 40% aqueous solution of sodium hypophosphite and 2 parts of a 3.8% aqueous solution of ammonium persulfate. Thereafter, the temperature was kept at 65° C. for 1 hour to complete the polymerization reaction, and then the resulting reaction mixture was cooled to not more than 50° C., and then neutralized with 41 parts of 30% aqueous sodium hydroxide solution to adjust the pH to 5-7, thereby obtaining Copolymer aqueous solution for cement blends, the weight average molecular weight of the copolymer is 33400. ...

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Abstract

The invention provides an early strength polycarboxylic acid water reducing agent and a preparation method thereof, and a cement admixture, wherein the early strength polycarboxylic acid water reducing agent includes a copolymer formed by polymerization of a monomer A and a monomer B, and the weight percentages of the two monomers are respectively 75%-90% and 10%-25%; the monomer A has the structural formula described in the specification, wherein R1 and R2 are alkenyl containing 3-6 carbon atoms, R3O can be the same or different and is an oxyalkylene group containing 2-18 carbon atoms, R4 is -H or hydrocarbyl containing 1-30 carbon atoms, and p is an integer or fraction of 1-300; the monomer B is one or more of acrylic acid, methacrylic acid, maleic acid, maleic anhydride, fumaric acid, citraconic acid and / or salts and / or esters thereof. Through introducing the new polymerization monomers, the early strength polycarboxylic acid water reducing agent having the advantages of high water reducing rate, short setting time, good early strength effect and stable performance is obtained; when used in precast concrete, the early strength polycarboxylic acid water reducing agent can significantly improve the early strength of concrete, thereby demolding early, improving the production efficiency, and reducing the production energy consumption of the precast concrete.

Description

technical field [0001] The invention relates to the field of polycarboxylate water reducer, in particular to an early-strength polycarboxylate water reducer, a preparation method thereof and a cement admixture. Background technique [0002] In order to improve the early strength of concrete, speed up template turnover, and speed up construction progress, technical approaches such as reducing the concrete water-binder ratio, increasing cement grade or cement dosage, and adding early-strength agents are generally used to achieve the above goals. [0003] Polycarboxylate superplasticizer is an admixture with carboxylic acid graft polymer as the main body. It is generally formed by copolymerization of polyether macromonomers containing terminal alkenyl groups and unsaturated carboxylic acid (salt) small monomer aqueous solutions. It has the advantages of low dosage, high water reducing rate and good slump retention performance, and can effectively increase the amount of fly ash,...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/14C08F222/06C08F228/02C04B24/16C04B24/26C04B103/30
CPCC04B24/165C04B24/2605C04B24/2647C04B2103/302C08F283/065C08F220/06C08F220/14C08F222/06
Inventor 牛峰来存远李磊李方
Owner 联泓新材料科技股份有限公司
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