Slow-release water reducing agent and preparation method thereof

A water-reducing agent and slow-release technology, applied in the field of slow-release water-reducing agent and its preparation, can solve the problems of difficult pumping, fast release, large loss, etc.

Pending Publication Date: 2021-10-26
GUANGDONG KEZHIJIE NEW MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, the present invention provides a slow-release water-reducer and its preparation method, which solves the problems caused by the rapid release speed and large loss of the existing polycarboxylate water-reducer while maintaining low dosage and high slump retention. Concrete cannot be transported over long distances, pumping is difficult, etc.

Method used

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  • Slow-release water reducing agent and preparation method thereof
  • Slow-release water reducing agent and preparation method thereof
  • Slow-release water reducing agent and preparation method thereof

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preparation example Construction

[0050] The invention also provides a preparation method of the slow-release water reducer.

[0051] A preparation method of slow-release water reducer comprises the following steps:

[0052] Put the unsaturated polyether into the reactor and start stirring;

[0053] Putting an initiator into the unsaturated polyether and stirring to obtain a mixed solution;

[0054] Liquid A, liquid B and liquid C are added dropwise to the mixed liquid to obtain a slow-release water reducer.

[0055] Specifically, liquid A, liquid B and liquid C are added dropwise at the same time.

[0056] The weight part of the unsaturated polyether is 2600-3300 parts; the weight part of the initiator is 6-10 parts; the weight part of the A liquid is 290-320 parts; the weight part of the B liquid is 520 parts -550 parts; The weight part of described C liquid is 390-420 parts.

[0057] In some embodiments, adding an initiator to the unsaturated polyether for stirring, the step of obtaining the mixed solut...

Embodiment 1

[0062] In the reactor, put 910 parts by weight of water into the reactor as bottom water, put 2600 parts by weight of isopentenol polyoxyethylene ether into the reactor, and start stirring at the same time to completely dissolve the unsaturated polyether , to obtain a mixture;

[0063] Configure A liquid: in parts by weight, 1.8 parts of reducing agent, 5.8 parts of thioglycolic acid, 300 parts of water, stir evenly, and prepare A liquid;

[0064] Configure B liquid: in parts by weight, 190 parts of hydroxyethyl acrylate, 47 parts of hydroxypropyl acrylate, and 300 parts of water are stirred evenly to prepare B liquid;

[0065] Configure liquid C: in parts by weight, 63 parts of acrylic acid, 135 parts of functional monomer B-135, and 300 parts of water, stir evenly to obtain liquid C;

[0066] Specifically, during the preparation process of liquid A, liquid B and liquid C, they are placed in a reactor with a stirring device for stirring under normal temperature conditions, a...

Embodiment 2

[0070] This implementation case is basically the same as the above implementation case 1, and only the differences will be described below;

[0071] Configure A liquid: in parts by weight, 2 parts of reducing agent, 6.3 parts of thioglycolic acid, 300 parts of water, stir evenly, and prepare A liquid;

[0072] Configure B liquid: in parts by weight, 190 parts of hydroxyethyl acrylate, 50 parts of hydroxypropyl acrylate, and 300 parts of water are stirred evenly to prepare B liquid;

[0073] Prepare liquid C: in parts by weight, 65 parts of acrylic acid, 242 parts of functional monomer B-242, and 300 parts of water are stirred evenly to prepare liquid C.

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Abstract

The invention relates to a slow-release water reducing agent and a preparation method thereof. The slow-release water reducing agent is prepared from the following raw materials in parts by weight: 2600-3300 parts of unsaturated polyether; 6-10 parts of an initiator; 290-320 parts of a liquid A; 520-550 parts of a solution B; 390-420 parts of a solution C; 900-930 parts of water; the liquid A comprises a reducing agent, a chain transfer agent and water; the liquid B comprises hydroxypropyl acrylate and water; the solution C comprises a functional monomer B-1, a functional monomer B-2, at least one of acrylic acid and methacrylic acid, and water. The slow-release water reducing agent keeps low mixing amount and high slump loss resistance, and solves the problems that concrete cannot be conveyed remotely and is difficult to pump due to the fact that an existing polycarboxylic acid water reducing agent is high in release speed and large in loss.

Description

technical field [0001] The invention relates to the technical field of engineering building materials, in particular to a slow-release water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate water reducer is the third generation water reducer product, it can not only greatly improve the comprehensive performance of slag-based cementitious materials and concrete, but also has the characteristics of low dosage, green environmental protection, large degree of freedom of molecular structure, etc. The application prospect is extremely broad. Polycarboxylate superplasticizer is a surface-active graft copolymer with a comb structure, usually consisting of two basic components, the main chain and the side chain. The main chain of polycarboxylate superplasticizer generally contains a large number of ionizable carboxyl groups. After the carboxyl groups are ionized in water, the superplasticizer molecules are adsorbed and anchored on the surface o...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/20C04B24/26C04B103/30
CPCC08F283/065C04B24/2694C04B2103/302C08F220/06C08F220/20
Inventor 熊秋闵许美洲陈晓彬邱年丽李格丽黄德东
Owner GUANGDONG KEZHIJIE NEW MATERIALS
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