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A kind of early-strength polycarboxylate water reducer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of polycarboxylate water reducer, can solve problems such as limited use and impact on development, and achieve good flow dispersion and high water reducing effect

Active Publication Date: 2019-11-26
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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  • A kind of early-strength polycarboxylate water reducer and preparation method thereof
  • A kind of early-strength polycarboxylate water reducer and preparation method thereof
  • A kind of early-strength polycarboxylate water reducer and preparation method thereof

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preparation example Construction

[0042] In one embodiment of the present invention, the preparation method of the early-strength polycarboxylic acid water reducing agent may specifically include:

[0043] Put the monomer A and deionized water into the reactor, stir until the monomer A is completely dissolved, and slowly increase the temperature to the reaction temperature of 20-40 ℃, add the oxidant at one time, after 5-10 minutes, drip into the reactor at the same time The aqueous solution made by adding monomer B and C and the aqueous solution made by monomer D, reducing agent and chain transfer agent; the former is dripped in 2.5~3h, and the latter is dripped in 3~3.5h; after both are dripped, continue After stirring for 1 to 2 hours, the temperature is lowered to normal temperature, and the pH of the system is adjusted to 6.5 to 7.5 with a 30 wt% NaOH solution to obtain an early-strength polycarboxylic acid water reducing agent.

[0044] The preparation method of the early-strength polycarboxylic acid water-re...

Embodiment 1

[0048] 150g methallyl polyoxyethylene ether (M=3000, average number of moles of ethoxy group m=65) and 130g deionized water are poured into the reactor, stirred until completely dissolved, and then added to the reactor at once 0.95g H 2 O 2 (30wt% aqueous solution), after 5-10 minutes, a solution of 16.56g acrylic acid, 3.95g sodium methacrylic acid sulfonate and 30g deionized water and 2.35g methacrylic acid-2-(two A mixed solution of methylamino) ethyl ester, 0.67g mercaptopropionic acid, 0.75gVc and 47g deionized water; the former is dripped in 3h, and the latter is dripped in 3.5h. After all the drops are finished, continue to stir for 1 hour, and finally reduce the temperature in the reactor to room temperature, adjust the pH to 6.5-7.5 with 30% NaOH solution, and add water to a solid content of 40wt% to obtain a high-reduced water early-strength polymer The weight-average molecular weight of the carboxylic acid water reducing agent is 13,600 measured by a multi-angle lase...

Embodiment 2

[0050] 150g methallyl polyoxyethylene ether (M=4000, the average number of moles of ethoxy group m=90) and 130g deionized water are poured into the reactor, stirred until completely dissolved, and then added to the reactor at once 1.25g H 2 O 2 (30wt% aqueous solution), after 5-10 minutes, a solution of 14.51g methacrylic acid, 3.24g sodium allyl sulfonate, 30g deionized water and 1.39g methacrylic acid-2- (Diethylamino) ethyl ester, 1.12g mercaptopropionic acid, 0.92gVc and 45g deionized water mixed solution; the former is dripped in 3h, and the latter is dripped in 3.5h. After all the drops are finished, continue to stir for 1 hour, and finally reduce the temperature in the reactor to room temperature, adjust the pH to 6.5-7.5 with 30% NaOH solution, and add water to a solid content of 40wt% to obtain a high-reduced water early-strength polymer The weight-average molecular weight of the carboxylic acid water reducing agent is 20380 as measured by a multi-angle laser light sca...

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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 polycarboxylic acid water reducing agent, in particular to a high water reducing and early strength type polycarboxylic acid water reducing agent used in precast 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. However, precast concrete requires rapid development of the early strength of concrete in order to increase the speed of formwork turnover, speed up the construction progress, and meet the strength development under low temperature conditions, extending the production cycle to winter. [0003] Generally, there are two technical ways to achieve early strength: one is the combination of ordinary water reducing agent and early strength agent. But the compound method has the problems of large dosage and poor compatibility between the two. In addition, some traditional inorganic salt ...

Claims

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Application Information

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Patent Type & Authority Patents(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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