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Early-strength polycarboxylate water reducing agent and preparation method thereof

A technology of water reducing agent and polycarboxylic acid, which is applied in the field of polycarboxylic acid water reducing agent, can solve the problems of restricting use and affecting development, and achieve the effect of good flow dispersion and high water reducing effect

Active Publication Date: 2017-05-10
JIANGSU OXIRANCHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, while having excellent performance, it also significantly delays the hydration of cement, affects the development of early strength, and limits its use in winter engineering and cold environments

Method used

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  • Early-strength polycarboxylate water reducing agent and preparation method thereof
  • Early-strength polycarboxylate water reducing agent and preparation method thereof
  • Early-strength polycarboxylate water reducing agent and preparation method thereof

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preparation example Construction

[0042] In one embodiment of the present invention, the preparation method of early-strength polycarboxylate superplasticizer may specifically include:

[0043] Put the monomer A and deionized water into the reactor, stir until the monomer A is completely dissolved, and slowly raise the temperature to the reaction temperature of 20-40°C, add the oxidant at one time, and drop it into the reactor at the same time after 5-10 minutes Add the aqueous solution made of monomers B and C and the aqueous solution made of monomer D, reducing agent and chain transfer agent; the former is finished dripping in 2.5-3 hours, and the latter is dripped in 3-3.5 hours; after both are completely dripped, continue After stirring for 1-2 hours, the temperature is lowered to normal temperature, and the pH of the system is adjusted to 6.5-7.5 with 30wt% NaOH solution to obtain an early-strength polycarboxylate superplasticizer.

[0044] The preparation method of the early-strength polycarboxylate wate...

Embodiment 1

[0048] 150g of methallyl polyoxyethylene ether (M=3000, the average number of moles of ethoxy groups m=65) and 130g of deionized water were thrown into the reactor, stirred until completely dissolved, and then added to the reactor at one time 0.95g H 2 o 2 (30wt% aqueous solution), after 5-10min, simultaneously in the reactor, dropwise add the solution that 16.56g acrylic acid, 3.95g sodium methacrylate and 30g deionized water mix and 2.35g methacrylic acid-2-(di Methylamino) ethyl ester, 0.67g mercaptopropionic acid, 0.75g Vc and 47g deionized water mixed solution; the former 3h drop, the latter 3.5h drop. After all the drops are finished, continue to stir for 1 hour, and finally lower the temperature in the reactor to normal temperature, adjust the pH to 6.5-7.5 with 30% NaOH solution, and replenish water until the solid content is 40wt%, that is, high water-reducing early-strength polymer Carboxylic acid water reducer, its weight average molecular weight measured by multi...

Embodiment 2

[0050] 150g of methallyl polyoxyethylene ether (M=4000, the average number of moles of ethoxy group m=90) and 130g of deionized water were thrown into the reactor, stirred until completely dissolved, and then added to the reactor at one time 1.25g H 2 o 2 (30wt% aqueous solution), after 5-10min, simultaneously dropwise add 14.51g methacrylic acid, 3.24g allyl sodium sulfonate and 30g deionized water mixed solution and 1.39g methacrylic acid-2- (Diethylamino) ethyl ester, 1.12g of mercaptopropionic acid, 0.92g of Vc and 45g of deionized water mixed solution; the former 3h drop, the latter 3.5h drop. After all the drops are finished, continue to stir for 1 hour, and finally lower the temperature in the reactor to normal temperature, adjust the pH to 6.5-7.5 with 30% NaOH solution, and replenish water until the solid content is 40wt%, that is, high water-reducing early-strength polymer Carboxylic acid water reducer, its weight average molecular weight measured by multi-angle la...

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Abstract

The invention provides an early-strength polycarboxylate water reducing agent and a preparation method thereof. The water reducing agent comprises the following structural units, wherein R1, R3 and R4 represent hydrogen or methyl; R2 represents-CH2-, -CH2CH2- or -O(CH2)4-; R5 represents dimethylamino, diethylamino group, diisopropylamide or morpholinyl; M1 and M2 represent H or Na; the numerical value of m is between 65 and 115; x, y, z and f represent the average mole numbers of each of the structural units. Compared with a common polycarboxylate water reducing agent, the early-strength polycarboxylate water reducing agent of one embodiment of the invention has longer side chains and a relatively shorter main chain, so that the content of carboxyl groups with delayed coagulation effect is reduced; meanwhile, high fluidity and dispersibility of the water reducing agent can be maintained by polyether structure units with large molecular weight, and the water reducing agent has a good water reducing effect.

Description

technical field [0001] The invention relates to a polycarboxylate water-reducer, in particular to a high water-reducing and early-strength polycarboxylate water-reducer used in prefabricated concrete. Background technique [0002] In recent years, with the rapid development of major projects such as railways, highways, bridges and subways, there is a huge demand for precast concrete. Precast concrete requires rapid early strength development of concrete to increase formwork turnover speed, speed up construction progress, meet strength development under low temperature conditions, and extend production cycle to winter. [0003] Generally, there are two technical ways to achieve early strength: one is the compounding of ordinary water reducing agent and early strength agent. However, the compounding method has the problems of large dosage and poor compatibility of the two. In addition, some traditional inorganic salts and organic early strength agents have problems such as c...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F220/06
Inventor 朱建民刘兆滨董振鹏顾晓华刘丙柱金兔红
Owner JIANGSU OXIRANCHEM CO LTD
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