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Preparation method for synthesizing high-performance polycarboxylate superplasticizer from novel VPEG polyether

A technology of polycarboxylic acid and water reducing agent, which is applied in chemical instruments and methods, feeding devices, chemical/physical processes, etc., and can solve problems such as unsatisfactory water reducing effect and slump retention performance, long reaction cycle, and high reaction temperature

Pending Publication Date: 2020-10-27
GUIZHOU DR SHI TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The object of the present invention is to provide a kind of preparation method of novel VPEG polyether synthetic high-performance polycarboxylate water reducing agent, to solve the high reaction temperature, long reaction cycle, high energy consumption, water reducing effect and slump retention performance in the prior art suboptimal problem

Method used

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  • Preparation method for synthesizing high-performance polycarboxylate superplasticizer from novel VPEG polyether
  • Preparation method for synthesizing high-performance polycarboxylate superplasticizer from novel VPEG polyether
  • Preparation method for synthesizing high-performance polycarboxylate superplasticizer from novel VPEG polyether

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1, preparation of bottom liquid: dissolve 90 parts of VPEG polyether macromonomer and 0.1 part of mercaptopropionic acid in 100 parts of tap water, stir and dissolve into a uniform and transparent solution, then add 1 part of acrylic acid and 1.8 parts of 30% mass fraction After stirring evenly, add 0.004 part of FeSO4 and 0.5 part of hydrogen peroxide with a mass fraction of 27.5% and stir evenly to form the bottom liquid;

[0048] Step 2, preparation of auxiliary liquid: 9 parts of acrylic acid, 0.4 part of γ-aminoethylaminopropyl trimethoxysilane, 0.4 part of mercaptopropionic acid and 10 parts of tap water are made into dripping liquid A material; 0.3 part of vitamin C and 20 parts of tap water are prepared into dripping liquid B material;

[0049] Step 3, blending and synthesis: after adding hydrogen peroxide in step 1 for 5 minutes, use a dropping device to add dropping liquid A and dropping liquid B into the bottom liquid in step 1 at the same time at room t...

Embodiment 2

[0052] Step 1, preparation of bottom liquid: dissolve 100 parts of VPEG polyether macromonomer and 0.2 part of mercaptoethanol in 100 parts of tap water, stir and dissolve into a uniform and transparent solution, add 3 parts of acrylic acid and 5.5 parts of 30% mass fraction of NaOH solution, after stirring evenly, add 0.006 part of FeSO4 and 0.7 part of ammonium persulfate and stir evenly to form a bottom liquid;

[0053] Step 2, preparation of auxiliary liquid: 9 parts of acrylic acid, 0.5 part of γ-aminoethylaminopropyl trimethoxysilane, 0.5 part of mercaptoethanol and 10 parts of tap water are made into dripping liquid A material; 0.5 part of hanging white block and 20 parts of tap water are made into dripping solution B material;

[0054] Step 3, blending and synthesis: after adding ammonium persulfate in step 1 for 5 minutes, use a dropping device to add dripping liquid A and dropping liquid B into the bottom liquid in step 1 at a constant speed at room temperature and s...

Embodiment 3

[0057] Step 1, preparation of bottom liquid: dissolve 120 parts of VPEG polyether macromonomer and 0.2 part of thioglycolic acid in 120 parts of tap water, stir and dissolve into a uniform and transparent solution, add 3 parts of acrylic acid and 5.5 parts of 30% mass fraction of NaOH solution, after stirring evenly, add 0.007 part of FeCl2 and 1 part of potassium persulfate and stir evenly to form a bottom liquid;

[0058] Step 2, auxiliary liquid preparation: 9 parts of acrylic acid, 0.6 parts of γ-glycidyl etheroxypropyl trimethoxysilane, 0.4 parts of mercaptoacetic acid and 10 parts of tap water are made into dripping liquid A material; 0.4 parts of E51 and 20 parts of Tap water is made into dripping liquid B material;

[0059] Step 3, blending and synthesis: after adding potassium persulfate in step 1 for 5 minutes, use a dripping device to add dripping liquid A and dripping liquid B into the bottom liquid in step 1 at a constant speed at room temperature and stir, drop ...

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Abstract

The invention belongs to the technical field of concrete admixtures and specifically relates to a preparation method for synthesizing a high-performance polycarboxylate superplasticizer from novel VPEG polyether. The preparation method comprises the following steps of: 1, preparing a base solution, namely uniformly stirring a VPEG polyether macromonomer, a chain transfer agent, tap water, an unsaturated carboxylic acid micromonomer, a NaOH solution, a metal catalyst and an oxidant to form the base solution; 2, preparing an auxiliary liquid: dissolving an unsaturated carboxylic acid small monomer, a silane coupling agent and a chain transfer agent in tap water to prepare a dropwise-added liquid material A, and dissolving a reducing agent in tap water to prepare a dropwise-added liquid material B; 3, blending and synthesizing, namely dropwise adding the dropwise-added liquid material A and the dropwise-added liquid material B into the base solution at a constant speed by using a dropwiseadding device, stirring, and keeping the temperature for 1 hour after dropwise adding is finished; and 4, adjusting the pH value. The preparation method of the water reducing agent is short in time and easy to control, energy is saved, and the prepared water reducing agent has good water reducing and slump retaining properties.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a preparation method of a novel VPEG polyether synthetic high-performance polycarboxylate water reducer. Background technique [0002] Polycarboxylate superplasticizer is a kind of comb-shaped polymer surfactant containing carboxyl group, ether group (ester group), hydroxyl group and sulfonic acid group. It has low dosage, high water reducing rate, and can be designed It has become the most widely used concrete admixture due to its strong performance and environmental friendliness, and is an important product of the new construction pillar industry. [0003] The macromonomers commonly used to prepare polycarboxylate superplasticizers are HPEG and TPEG, which belong to vinyl alcohol 4-carbon and 5-carbon macromonomers, and generally need to be processed under high temperature (40-70°C or higher) conditions. To produce polycarboxylate superplasticizers, eve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/42C04B24/26C08F283/06C08F220/06C08F2/38B01J4/00B01J4/02C04B103/30
CPCB01J4/001B01J4/02C04B24/2647C04B24/267C04B40/0039C04B2103/302C08F2/38C08F283/065C08F220/06C04B24/42
Inventor 曾珣陈杰方世昌田应兵
Owner GUIZHOU DR SHI TECH
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