Polycarboxylic acid water reducing agent used for polyether with molecular weight of 1200 and preparation method of polycarboxylic acid water reducing agent

A technology of polycarboxylic acid and water reducing agent, applied in the field of building materials and polycarboxylate water reducing agent, can solve the problem of poor wrapping and slump retention, limited steric hindrance, and difficulty in ensuring pumping and pouring performance, etc. problem, to achieve the effect of good softness and good wrapping performance

Inactive Publication Date: 2018-11-16
HUBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the differences in the types of sand and gravel materials in different regions, ordinary polycarboxylate superplasticizers are often unable to take care of both. Especially with the continuous expansion of the use of raw materials with large powder content such as machine-made sand, there is an urgent need for a suitable A new type of polycarboxylate superplasticizer to supplement the situation
[0003] When the ordinary polycarboxylate superplasticizer has a lot of fine powder, the stretching of the side chain is inhibited, and the steric hindrance effect is limited. On the concrete, the water reducing rate is not high, and the encapsulation and slump retention are relatively poor. Poor, it is difficult to ensure the working performance of pumping and pouring

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] 1. The first addition: 310 parts of Oak Chemical TPEG1200 monomer, 6 parts of acrylic acid, 9 parts of triphenylethyl phenoxy ether methacrylate and polydimethylsiloxane with a mass ratio of 1:1 Add the alkane monomethacrylate composition and 180 parts of water to the reaction kettle, stir and heat until it is dissolved;

[0040] 2. Add hydrogen peroxide: measure the temperature in the reactor and control the temperature in the reactor at 40°C. After the temperature is stable, add 0.9 parts of hydrogen peroxide at one time;

[0041] 3. Adding solution A and solution B: After 5 minutes, start to add solution B and solution A successively. After the initiator is added, start to add solution A within 10 minutes. The addition time of solution A is 2 hours, solution B The dropping time is 2.5 hours; Solution B is uniformly mixed with 0.32 parts of sodium bisulfite, 0.55 parts of mercaptopropanol and 80 parts of water, and solution A is composed of 54 parts of acrylic acid and 5 p...

Embodiment 2

[0044] 1. The first feeding: Add 315 parts of Oak Chemical MPEG1200 monomer, 7 parts of acrylic acid, 7 parts of triphenylethyl phenoxy ether methacrylate and 185 parts of water into the reaction kettle, stir and heat it. Dissolve

[0045] 2. Add hydrogen peroxide: measure the temperature in the reactor and control the temperature in the reactor at 41℃. After the temperature is stable, add 1 part of hydrogen peroxide at once;

[0046] 3. Addition of solution A and solution B: After 5 minutes, start to add solution B and solution A successively. After the initiator is added, start to add solution A within 10 minutes. The addition time of solution A is 2.5 hours, solution B The dripping time is 3 hours; solution B is uniformly mixed with 0.35 parts of dextrose monohydrate, 0.5 parts of thioglycolic acid and 85 parts of water, solution A is composed of 50 parts of acrylic acid, 4 parts of trifluoroethyl acrylate, 6 parts by mass ratio of 1 :1, a composition of 1,2-bis(4-aminophenoxy)...

Embodiment 3

[0049] 1. The first feeding: add 320 parts of Jiahua Chemical APEG1200 monomer, 12 parts of acrylic acid, 6 parts of polydimethylsiloxane monomethacrylate and 190 parts of water into the reactor, stir and heat until it is dissolved ;

[0050] 2. Add hydrogen peroxide: measure the temperature in the reactor and control the temperature in the reactor at 42°C. After the temperature is stable, add 1.3 parts of hydrogen peroxide at one time;

[0051] 3. Adding solution A and solution B: After 5 minutes, start to add solution B and solution A successively. After the initiator is added, start to add solution A within 10 minutes. The dripping time of solution A is 2.3 hours, and solution B The dropping time is 2.8 hours; Solution B is made by uniformly mixing 0.4 parts of sodium hypophosphite, 0.4 parts of mercaptopropionic acid and 90 parts of water, and solution A is made of 44 parts of acrylic acid and 3 parts of methacrylic acid 2,2,2-tri Fluoroethyl ester, 5 parts of cyclobutane tetr...

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PUM

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Abstract

The invention provides a polycarboxylic acid water reducing agent used for a polyether with a molecular weight of 1200 and a preparation method of the polycarboxylic acid water reducing agent. The polycarboxylic acid water reducing agent comprises the following components in parts by weight: 310-330 parts of a polyether macromonomer with a molecular weight of 1200, 4-14 parts of acrylic acid, 2-9parts of a carboxylate monomer, 2-5 parts of a fluoro functional monomer, 0.9-1.8 parts of hydrogen peroxide, 4-10 parts of a flexible chain monomer, 0.32-0.5 part of a reducing agent, 0.3-0.7 part ofa chain transfer agent, 6-10 parts of a neutralizing agent, and the balance water, wherein a total mass is 1000 parts, and after preparation is performed, a mass fraction of a finished product is 40%, and an acid-ether ratio is 2.7-3.3. The method is performed according to the following steps: 1, material addition for the first time; 2, addition of the hydrogen peroxide; 3, addition of a solutionA and a solution B; and 4, preparation of the finished product. The polycarboxylic acid water reducing agent and method provided by the invention adopt the polyether monomer with the molecular weightof 1200 as a raw material to obtain a suitable side-chain length which can be stretched in the environment, and the problem of weaken steric hindrance brought by a short side chain is compensated.

Description

Technical field: [0001] The invention relates to the technical field of building materials and polycarboxylic acid water reducer, and particularly relates to a polycarboxylic acid water reducer for 1200 molecular weight polyether and a preparation method. Background technique: [0002] As the third-generation high-performance water-reducing agent, polycarboxylic acid water-reducing agent has excellent performance in concrete applications. However, due to the differences in the regional types of sand and gravel materials, ordinary polycarboxylic acid water-reducing agents are often unable to take care of it. Especially as the use of raw materials with large powder content such as machine-made sand continues to expand, there is an urgent need for a suitable one. The situation of the new polycarboxylic acid water reducer is supplemented. [0003] Ordinary polycarboxylate water-reducing agent when there are more fine powders, the extension of the side chain is inhibited, the steric hi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F283/12C04B24/26C04B103/30
CPCC04B24/2694C04B2103/302C08F283/065C08F283/124
Inventor 柯凯罗正权严明陈艳林熊焰
Owner HUBEI UNIV OF TECH
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