A kind of preparation method of polycarboxylate superplasticizer

A high-efficiency water-reducing agent and polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problems of long reaction period, low control precision and high reaction temperature, and achieve the effects of short reaction period, high purity and high quality

Active Publication Date: 2018-07-06
HUNAN MAINHORN TECH DEV CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] The purpose of the present invention is to address the above problems, to provide a preparation method of polycarboxylate high-efficiency water reducer, which overcomes the disadvantages of high reaction temperature, long reaction cycle, complicated operation and low control precision in the prior art, and consumes less resources. , simple process, short reaction cycle, no heat source, normal temperature production, low energy consumption, simple and reliable control

Method used

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  • A kind of preparation method of polycarboxylate superplasticizer

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Embodiment 1

[0030] A kind of preparation method of polycarboxylate superplasticizer, it comprises following preparation steps:

[0031] Step 1. Preparation of base liquid: Add 160 parts of methallyl alcohol polyoxyethylene ether and 190 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 25°C, stir for 25 minutes and then add 0.75 parts of ammonium persulfate. After stirring for 4 minutes, add 15 parts of acrylic acid and 10 parts of water at the same time, and form the base liquid after stirring for 8 minutes;

[0032] Step 2, preparation of auxiliary liquid: add 0.6 part of ascorbic acid and 0.75 part of thioglycolic acid into another reactor, and form auxiliary liquid after stirring for 4 minutes;

[0033] Step 3, blending and synthesis: drop the base liquid and auxiliary liquid into the reaction kettle at the same time, stir for 1 hour, add sodium hydroxide, adjust the pH value to 7, and obtain a polycarboxylic acid superplasticizer; the b...

Embodiment 2

[0035] Step 1. Preparation of base liquid: add 120 parts of macromolecular unsaturated monomer and 150 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 20°C, stir for 20 minutes, add 0.1 part of potassium persulfate, and stir for 3 minutes Finally, add 10 parts of unsaturated carboxylic acid and 8 parts of water at the same time, and stir for 6 minutes to form a base liquid; the unsaturated monomers are methallyl alcohol polyoxyethylene ether, polyalkylene glycol allyl ether, methoxy One or more of polyethylenyl allyl ether, isopentenol polyoxyethylene ether, polyethylene glycol acrylate, and methoxy polyethylene glycol acrylate; the unsaturated hydroxy acid is acrylic acid Or one or more of methacrylic acid;

[0036] Step 2, preparation of auxiliary liquid: add 0.1 part of reducing agent and 0.1 part of chain transfer agent in another reactor, and form auxiliary liquid after stirring for 3 minutes; The one of; described reduci...

Embodiment 3

[0039] Step 1. Preparation of base liquid: add 200 parts of macromolecular unsaturated monomer and 230 parts of water into the reactor according to the mass fraction ratio, maintain the temperature at 30°C, stir for 30 minutes, add 1.5 parts of hydrogen peroxide, and stir for 5 minutes Finally, add 20 parts of unsaturated carboxylic acid and 12 parts of water at the same time, and form base liquid after stirring for 10 minutes; the unsaturated monomer is methallyl alcohol polyoxyethylene ether, polyalkylene glycol allyl ether, methoxy One or more of polyethylenyl allyl ether, isopentenol polyoxyethylene ether, polyethylene glycol acrylate, and methoxy polyethylene glycol acrylate; the unsaturated hydroxy acid is acrylic acid Or one or more of methacrylic acid;

[0040] Step 2, preparation of auxiliary liquid: add 1 part of diaobai and 1 part of chain transfer agent to another reactor, and form auxiliary liquid after stirring for 5 minutes; the chain transfer agent is isopropan...

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Abstract

The invention discloses a preparation method of a polycarboxylate superplasticizer. The method comprises the following steps: adding an initiation assistant and a single-molecular unsaturated monomer containing a polyether long chain to a reaction kettle, rapidly adding unsaturated carboxylic acid, a reducing agent and a chain transferring agent in a dropwise manner, copolymerizing the unsaturated monomer and the unsaturated carboxylic acid at normal temperature, carrying out heat insulation, and neutralizing the obtained material to neutrality in order to obtain the polycarboxylate superplasticizer. The polycarboxylate superplasticizer has a high water reducing rate, and the preparation method has the advantages of simplicity, no need of a heat source, short reaction period and low energy consumption.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a preparation method of a polycarboxylic acid high-efficiency water reducer. Background technique [0002] Water reducer is an important concrete admixture and an important product of the new construction pillar industry. The polycarboxylate high-efficiency water-reducer is the third generation of high-performance water-reducer developed after the ordinary water-reducer represented by lignosulfonate and the high-efficiency water-reducer represented by naphthalene series. It is the environment-friendly high-efficiency superplasticizer with the highest, best application prospect and best comprehensive performance. In 2000, my country began the production and application of polycarboxylate-based water-reducing agents. In 2007, the construction of high-speed railways drove the rapid development of polycarboxylate-based high-performance water-reducing agents. Since 2011, ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F283/06C08F220/06C08F4/40C08F2/38C04B24/26C04B103/30
CPCC04B24/2647C04B2103/302C08F2/38C08F4/40C08F283/065C08F220/06
Inventor 闵亚红吴振军贺海量蔡炳煌唐海李仕林袁剑涛
Owner HUNAN MAINHORN TECH DEV CO LTD
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