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Polycarboxylic concrete water reducer

A concrete water-reducing agent and polycarboxylic acid-based technology, applied in the field of concrete water-reducing agent, can solve the problems of strong negative polar groups losing electrostatic repulsion effect, unsatisfactory dispersion retention, etc., and achieve good dispersion retention. Effect

Active Publication Date: 2015-06-24
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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  • Polycarboxylic concrete water reducer
  • Polycarboxylic concrete water reducer
  • Polycarboxylic concrete water reducer

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Embodiment 1～10

[0022] 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.

[0023] Dilute the required amount of monomer A with water to a concentration of about 70 wt%, and put it into the reactor. Start stirring, heat up, and when the system temperature reaches 60°C, add the required amount of monomers B and D, and continue to heat up to 85°C. Take the required amount of monomers C and E, add water and dilute to a concentration of about 70wt% (concentration is the sum of monomers C and E), and prepare dropwise solution I. Take an appropriate amount of initiator ammonium persulfate, add water to dilute to a concentration of 70 wt%, and prepare dropwise liquid II. The temperature of the system is controlled at 85°C, and the addition solution I and II are added dropwise to the system at the same time at a separate position, and the dropping time is controlled at 3 to 5 hours. After the dropwise a...

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Abstract

The invention provides a polycarboxylic concrete water reducer which is a copolymer formed by copolymerizing monosomic A, B, C, D and E, wherein the weight-average molecular weight of the copolymer is 20000 to 50000; A is allyl polyglycol ether or methyl-allyl-polyglycol ether, of which the weight-average molecular weight is 800 to 4000; B is maleic anhydride; C is acrylic acid or methacrylic acid; D is 2-acrylamide; and E is N, N'-methylene-bis-acrylamide. 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). Compared with the prior art, the invention has the advantages that under the condition of low dosage of the polycarboxylic concrete water reducer, the dispersivity and the retentivity of concrete are also kept favorable, and the gradual loss control of cement paste fluidity of the polycarboxylic concrete water reducer is obviously superior to a general polycarboxylic water reducer.

Description

technical field [0001] The invention relates to a concrete water reducer, in particular to a polycarboxylate-based 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 plasticity in molecular structure design, and basically no "three wastes" in the pro...

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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