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Method for preparing pure solid polycarboxylic acid slump retaining agent

A technology of polycarboxylic acid and slump-retaining agent, applied in the field of concrete admixtures, can solve the problems of complex process, long reaction time, insufficient purity of two-step synthetic products, etc., and achieve the effects of simple process and short production cycle

Inactive Publication Date: 2019-06-04
FUSHUN DONGKE FINE CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this method, the purity of the two-step synthetic product is insufficient, the process is complicated, and the reaction time is too long

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: it comprises the steps:

[0025] 1. Add the unsaturated polyoxyethylene ether into the reactor, raise the temperature to 50-80°C, and wait for the unsaturated polyoxyethylene ether to be liquid; polyoxyethylene ether

[0026] 2. Add the weighed molecular weight regulator, unsaturated acid monomer, unsaturated ester monomer, and initiator to the reactor at one time; there is no need to add drips or intervals during the feeding and reaction process;

[0027] Wherein, the molar ratio of molecular weight regulator and unsaturated polyoxyethylene ether is 0.3:1; Molecular weight regulator adopts sodium hypophosphite, mercaptoethanol, mercaptopropionic acid, n-dodecyl mercaptan;

[0028] The molar ratio of unsaturated acid monomers to unsaturated polyoxyethylene ethers is 3:1; unsaturated acid monomers use maleic anhydride, acrylic acid, and methacrylic acid;

[0029] The molar ratio of unsaturated ester monomer to unsaturated polyoxyethylene ether is 7:1; uns...

Embodiment 2

[0033] Embodiment 2: it comprises the following steps:

[0034] 1. Add the unsaturated polyoxyethylene ether into the reactor, raise the temperature to 50-80°C, and wait for the unsaturated polyoxyethylene ether to be liquid; Polyoxyethylene ether, 4-hydroxybutyl vinyl ether polyoxyethylene ether, ethylene glycol monovinyl ether polyoxyethylene ether;

[0035] 2. Add the weighed molecular weight regulator, unsaturated acid monomer, unsaturated ester monomer, and initiator to the reactor at one time; there is no need to add drips or intervals during the feeding and reaction process;

[0036] Wherein, the molar ratio of molecular weight regulator and unsaturated polyoxyethylene ether is 0.8:1; Molecular weight regulator adopts sodium hypophosphite, mercaptoethanol, thioglycolic acid, mercaptopropionic acid, n-dodecyl mercaptan;

[0037] The molar ratio of unsaturated acid monomers to unsaturated polyoxyethylene ethers is 5:1; unsaturated acid monomers use maleic anhydride, acry...

Embodiment 3

[0042] Embodiment 3: it comprises the steps:

[0043] 1. Add the unsaturated polyoxyethylene ether into the reactor, raise the temperature to 50-80°C, and wait for the unsaturated polyoxyethylene ether to be liquid; Base vinyl ether polyoxyethylene ether;

[0044] 2. Add the weighed molecular weight regulator, unsaturated acid monomer, unsaturated ester monomer, and initiator to the reactor at one time; there is no need to add solvent dropwise during the feeding process, and there is no need to feed at intervals;

[0045] Wherein, the molar ratio of molecular weight regulator and unsaturated polyoxyethylene ether is 0.2:1; Molecular weight regulator adopts mercaptoacetic acid, mercaptopropionic acid;

[0046] The molar ratio of unsaturated acid monomer to unsaturated polyoxyethylene ether is 0.08:1; unsaturated acid monomer adopts acrylic acid and sodium methacrylate;

[0047] The molar ratio of unsaturated ester monomer to unsaturated polyoxyethylene ether is 0.1:1; unsatur...

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PUM

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Abstract

The invention discloses a method for preparing a pure solid polycarboxylic acid slump retaining agent. Unsaturated polyoxyethylene ether, a molecular weight regulator, an unsaturated acid monomer, anunsaturated ester monomer and an initiator are directly mixed without the need of dropwise adding reaction materials, and a bulk polymerization reaction is directly carried out within a short time of0.5-1.5 h to prepare the pure solid polycarboxylic acid slump retaining agent. The reaction process is solvent-free and requires no dropwise addition; the reaction and production period is extremely short; the production efficiency is extremely high; the process is easy to control; the finished product is prepared without post-treatment processes such as drying or separation of a solvent, etc.; performance of the finished product is unchanged; production cost is greatly saved; production efficiency is increased; and the product has good market competitiveness and application prospect.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures in building materials, in particular to a method for preparing pure solid polycarboxylate slump-retaining agent. Background technique [0002] Polycarboxylate water reducer is a new type of cement dispersant in the application of cement concrete. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers are environmentally friendly, high water reducing rate, and low slump. Excellent performance such as loss of strength has become a key material for high-performance concrete. In recent years, with the rise of national projects such as high-speed rail, passenger dedicated lines, nuclear power, water conservancy, and other infrastructure constructions, the market demand for polycarboxylate products continues to grow. [0003] However, environmental protection has been paid more and more attention worldwide, and my country has strictly controlled engineering...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/20C08F230/02C08F222/06C08F220/06C08F228/02C04B24/26C04B24/16C04B103/30
Inventor 汤世伟肖群李念祖国坤陈雨蒙付慧截
Owner FUSHUN DONGKE FINE CHEM
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