Method for synthesizing polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer

A heterogeneous catalysis, polyether macromonomer technology, applied in the field of water reducing agent preparation, can solve problems such as increasing energy consumption, dispersing performance, insufficient slump retention performance, and reducing product market competitiveness.

Pending Publication Date: 2021-09-10
SICHUAN TONGZHOU CHEM TECH +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the process of free radical polymerization to prepare polycarboxylate superplasticizers, the activity of polyether macromonomers is much lower than that of small molecular unsaturated carboxylic acid monomers; Copolymerization can only prolong the dropping time of small molecular monomers, so the preparation time of polycarboxylate water reducer is generally mor

Method used

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  • Method for synthesizing polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer
  • Method for synthesizing polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer
  • Method for synthesizing polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer

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Effect test

Embodiment 1

[0050] A method for heterogeneously catalyzed binary copolymerization of nickel oxide of 6C polyether macromonomer into polycarboxylate water reducer, the steps are: prepare liquid A (weigh 3.2 g of small monomer and 15 g of distilled water) and liquid B respectively (ascorbic acid 0.03g, thioglycolic acid 0.35g and distilled water 17g) stand-by, in the there-necked flask that is equipped with thermometer, add macromonomer (EPEG) 36g and distilled water 15g, at room temperature, cool down gradually and stir to dissolve, treat that temperature controls to When the macromonomer is completely dissolved at 0°C, add 0.001g of nickel oxide and 3g of water, mix and stir for 10 minutes, then add 0.15g of hydrogen peroxide and 0.5g of water, mix well, and add liquid A at a constant speed at the same time using a constant pressure dropping funnel ( 30min dripping) and B solution (60min dripping), the holding time is 0.5h, and the reacted material is allowed to stand at room temperature, ...

Embodiment 2

[0052] A method for heterogeneously catalyzed binary copolymerization of nickel oxide of 6C polyether macromonomer into polycarboxylate water reducer, the steps are: prepare liquid A (weigh 3.3 g of small monomer and 15 g of distilled water) and liquid B respectively (ascorbic acid 0.02g, thioglycolic acid 0.35g and distilled water 17g) stand-by, in the there-necked flask that is equipped with thermometer, add macromonomer (EPEG) 34g and distilled water 15g, at room temperature, cool down gradually and stir to dissolve, treat that temperature controls to When the macromonomer is completely dissolved at 5°C, add 0.02g of nickel oxide and 3g of water, mix and stir for 5 minutes, then add 0.35g of hydrogen peroxide and 2g of water, mix well, and add liquid A at a constant speed at the same time using a constant pressure dropping funnel (30min After dripping) and B solution (60min dripping), the holding time is 0.5h, and the reacted material is allowed to stand at room temperature ...

Embodiment 3

[0054] A method for heterogeneously catalyzed binary copolymerization of nickel oxide of 6C polyether macromonomer into polycarboxylate water reducer, the steps are: prepare liquid A (weigh 3.8 g of small monomer and 16 g of distilled water) and liquid B respectively (ascorbic acid 0.02g, thioglycolic acid 0.25g and distilled water 18g) stand-by, in the there-necked flask that is equipped with thermometer, add macromonomer (EPEG) 38g and distilled water 16g, at room temperature, gradually cool down and stir to dissolve, until temperature is controlled to When the macromonomer is completely dissolved at 10°C, add 0.04g of nickel oxide and 3g of water, mix and stir for 6 minutes, then add 0.4g of hydrogen peroxide and 2g of water, mix well, and drop A liquid at a constant speed at the same time with a constant pressure dropping funnel (29min After dripping) and B solution (60min dripping), the holding time is 0.5h, and the reacted material is allowed to stand at room temperature ...

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Abstract

The invention discloses a method for synthesizing a polycarboxylate superplasticizer by nickel oxide heterogeneous catalysis binary copolymerization of 6C polyether macromonomer. The method is characterized by comprising the following steps: taking raw materials of a macromonomer, a small monomer, a chain transfer agent, a reducing agent, an oxidizing agent, a catalyst and water, and mixing the small monomer with the water to prepare a solution A; mixing the reducing agent, the chain transfer agent and water to prepare a solution B; and adding the macromonomer and water into a reactor with a thermometer, cooling and stirring, when the temperature is controlled to 0-15 DEG C and the macromonomer is completely dissolved, adding the catalyst and water, mixing, adding the oxidizing agent and water, mixing, simultaneously dropwise adding the solution A and the solution B at a constant speed for 1-2 hours, and standing the reacted material to room temperature, thereby obtaining the polycarboxylate superplasticizer. The polycarboxylate superplasticizer prepared by the invention is suitable for preparation of concrete, and has the characteristics of simple production conditions, industrial production, excellent cement dispersing performance and long-term slump retaining performance, good compressive strength and durability and the like.

Description

technical field [0001] The invention belongs to a method for preparing a water reducer, and relates to a method for producing a polycarboxylate water reducer by nickel oxide heterogeneously catalyzed binary copolymerization of a 6C polyether macromonomer (ie: diethylene glycol monovinyl ether) . The polycarboxylate water reducer prepared by the invention is suitable for the preparation of concrete. Background technique [0002] The development of modern concrete admixture technology is the key to the development of modern concrete technology and plays a decisive role in the development of concrete technology. Concrete admixture is an essential component in modern concrete except cement, sand, stone, water, and admixtures, especially the third-generation polycarboxylate high-performance admixture, which accounts for 10% of the amount of concrete admixture used. About 80% is one of the important technical ways to reduce the amount of cement, improve the utilization rate of i...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C08F228/02C08F220/58C08F4/40C08F4/26C04B24/16C04B24/26C04B103/30
CPCC08F283/065C08F4/40C08F4/26C04B24/165C04B24/2605C04B2103/302C08F220/06C08F220/20C08F228/02C08F220/585
Inventor 舒豆豆舒学军刘才林张恒通任先艳杨海君何年罗率
Owner SICHUAN TONGZHOU CHEM TECH
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