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Method for preparing copolymer of polycarboxylic concrete water reducer

A technology of concrete water reducing agent and polycarboxylic acid series, which is applied in the field of copolymer preparation, can solve the problems of strong negative polar groups losing electrostatic repulsion and unsatisfactory dispersion retention, and achieve good dispersion retention Effect

Active Publication Date: 2014-09-03
SHANGHAI DUOLUN CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, generally as time goes by, the strong negative polar groups are easily wrapped by cement particles and lose the electrostatic repulsion effect. Therefore, the existing polycarboxylate water reducer is still not very ideal in terms of dispersion retention, such as the flow of pure slurry. The time loss of degree is often more obvious

Method used

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  • Method for preparing copolymer of polycarboxylic concrete water reducer
  • Method for preparing copolymer of polycarboxylic concrete water reducer
  • Method for preparing copolymer of polycarboxylic concrete water reducer

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Embodiment 1～10

[0021] The synthesis reaction was carried out in a glass reactor with a volume of 800 mL and equipped with a stirrer, a thermometer and a dropping funnel.

[0022] 1) Put the required amount of monomers A, B and D into the reactor, heat properly and start stirring, and prepare the monomers into an aqueous solution of the mixture. Solution concentration is controlled as 60~80wt% with A, B and D total amount;

[0023] 2) The system is heated up to the reaction temperature, and at the same time, the monomers C and E diluted with water and the initiator ammonium persulfate are slowly and continuously added dropwise to the reactor to start the copolymerization reaction. The reaction temperature is controlled at 60-90° C., the duration of the dropping is controlled at 3.0-5.0 hours, and the reaction is continued for 1.0-3.0 hours after the dropping. The amount of the initiator added is based on the monomer A, which is 0.5-3.0wt%;

[0024] 3) After the reaction is completed, the re...

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Abstract

A method for preparing the copolymer of polycarboxylic concrete water reducer is used for copolymerizing monosomic A, B, C, D and E into a product, wherein A is allyl polyglycol ether or methyl-allyl-polyglycol ether; B is maleic anhydride; C is acrylic acid or methacrylic acid; D is 2-acrylamide; and E is N, N'-methylene-bis-acrylamide. The preparation process comprises the following steps: 1), preparing a water solution of the mixture of the monosomic A, B and D; 2), adding the monosomic C and E and an initiating agent dropwise to the water solution of the mixture for copolymerization, wherein the reaction temperature is 60 to 90 DEG C, the adding operation lasts for 3.0 to 5.0 h, and the reaction time is 1.0 to 3.0; and 3), carrying out neutralization reaction to obtain the product. Taken by molarity part, when A is 1.0, B is 0.4 to 2.0, C is 1.0 to 3.0, D is 0.1 to 1.0, and the ratio between A+B+C+D and E is 100 to (0.5 to 1.8).

Description

technical field [0001] The invention relates to a preparation method of a copolymer used as a concrete water reducer, in particular to a preparation method of a copolymer used as a polycarboxylate concrete water reducer. Background technique [0002] Water reducer is an important concrete admixture, which can greatly reduce the water-cement ratio of concrete, increase fluidity, improve the construction performance of concrete, and improve the strength and durability of concrete. The commonly used water reducers in the early days mainly include naphthalenesulfonic acid formaldehyde condensate, melamine formaldehyde condensate, sulfamate, etc., but these types of water reducers have large slump loss and water reducing rate Relatively low, serious environmental pollution and other issues. Polycarboxylate superplasticizer is a new generation of high-performance superplasticizer, which has the advantages of low dosage, high water reducing rate, good slump loss control, strong pl...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F290/06C08F220/06C08F222/06C08F220/54C08F222/38C04B24/26C04B103/30
Inventor 朱学文舒建生徐兴建
Owner SHANGHAI DUOLUN CHEM
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