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High-workability polycarboxylic water reducer and preparation method and use method thereof

A polycarboxylic acid-based, water-reducing agent technology, applied in the field of building materials, can solve problems such as unsatisfactory workability, and achieve the effects of being conducive to large-scale industrial production, convenient operation, and high workability

Active Publication Date: 2018-05-25
SHANGHAI DONGDA CHEM
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The technical problem to be solved by the present invention is to overcome the defects of unsatisfactory workability of the existing polycarboxylate water reducer, and provide a high workability polycarboxylate water reducer, its preparation method and use method

Method used

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  • High-workability polycarboxylic water reducer and preparation method and use method thereof
  • High-workability polycarboxylic water reducer and preparation method and use method thereof
  • High-workability polycarboxylic water reducer and preparation method and use method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0039] (1) Preparation before polymerization:

[0040] Preparation of mixture A: Weigh 100 parts by weight of unsaturated polyether with a number average molecular weight of 1200 and 20 parts by weight of water, put them into a polymerization reactor, stir evenly, heat up to 60°C, and set aside;

[0041] Preparation of solution B: Weigh 24 parts by weight of maleic anhydride, 3 parts by weight of polyethylene glycol methacrylate phosphate, 6 parts by weight of sodium methacrylate and 30 parts by weight of water, stir evenly, and prepare for dropwise addition;

[0042]Preparation of solution C: Weigh 0.20 parts by weight of L-ascorbic acid, 0.40 parts by weight of mercaptopropionic acid, 0.30 parts by weight of thioglycolic acid and 40 parts by weight of water, stir evenly, and prepare dropwise;

[0043] Preparation of solution D: weigh 0.8 parts by weight of hydrogen peroxide and 40 parts by weight of water, stir evenly, and prepare to add dropwise;

[0044] (2) Polymerizatio...

Embodiment 2～5

[0048] The preparation methods of Examples 2-5 are the same as those of Example 1, and the differences are specifically marked in Table 1 below.

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Abstract

The invention discloses a high-workability polycarboxylic water reducer and a preparation method and a use method thereof. The high-workability polycarboxylic water reducer is prepared from raw materials comprising the following components in parts by weight: 100 parts of unsaturated polyether, 12-24 parts of maleic anhydride, 3-12 parts of polyethylene glycol methacrylate phosphate, 2-10 parts ofsodium methallyl sulfonate, 1.2-2 parts of ammonium persulfate, 0.8-1.2 parts of hydrogen peroxide, 0.20-0.40 part of L-ascorbic acid, 0.40-0.60 part of mercaptopropionic acid, 0.10-0.30 part of mercaptoacetic acid, 5-7 parts of sodium hydroxide and 140-260 parts of water, wherein the unsaturated polyether is allyl alcohol polyoxyethylene ether of which the number-average molecular weight is 1200-2400. The high-workability polycarboxylic water reducer disclosed by the invention has good performance and has obvious economic benefit, social benefit and environmental benefit; and the preparationprocess is simple and convenient to operate.

Description

technical field [0001] The invention relates to the technical field of building materials, in particular to a high-workability polycarboxylate water reducer, a preparation method and a use method thereof. Background technique [0002] Concrete workability refers to the performance that the concrete mixture is easy to construct and operate, and can obtain uniform quality and compact shape. Workability is a comprehensive technical property, including three aspects of fluidity, cohesion and water retention. These three aspects are related to each other, but there are often contradictions. Fluidity refers to the property that the concrete mixture is easy to flow, transport and fill the concrete formwork under the action of gravity or mechanical vibration; cohesion is the ability of the concrete mixture to maintain the overall uniformity during the construction process; Good cohesion can ensure that the concrete mixture does not delaminate or segregate during the process of conv...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F222/06C08F230/02C08F228/02C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F283/065C08F222/06C08F230/02C08F228/02
Inventor 罗琼李亚杰王万林杜辉王振波董建国
Owner SHANGHAI DONGDA CHEM
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