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A super high-early-strength polycarboxylic acid water reducer and a preparing method thereof

A super early-strength, polycarboxylic acid technology, applied in the field of concrete admixtures, can solve the problem of not having a good solution, and achieve the effects of high water reduction rate, low dosage, and smooth and beautiful appearance.

Inactive Publication Date: 2017-06-06
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The two approaches have their own advantages and disadvantages, and their working principles are not the same. In addition, there is no good plan for how to adjust

Method used

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  • A super high-early-strength polycarboxylic acid water reducer and a preparing method thereof
  • A super high-early-strength polycarboxylic acid water reducer and a preparing method thereof

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preparation example Construction

[0022] The invention discloses a super early strength polycarboxylate water reducer, the preparation method of which comprises the following steps:

[0023] (1) 25-35 parts of monomer C, 15-25 parts of monomer D, 1.5-2.5 parts of chain transfer agent, and 50-70 parts of deionized water are mixed and stirred evenly as small material A in the above parts by weight;

[0024] Wherein, monomer C is one or more of acrylic acid, methacrylic acid, 2-acrylamide-2-methylpropanesulfonic acid, maleic anhydride, fumaric acid, aconitic acid;

[0025] Monomer D is one or more of acrylamide, N-isopropylacrylamide, N,N-dimethylacrylamide, and dimethylaminoethyl methacrylate;

[0026] The chain transfer agent is one or both of mercaptopropionic acid and mercaptoacetic acid.

[0027] (2) 0.6-0.9 parts of reducing agent and 100-120 parts of deionized water in the above parts by weight; mixed and stirred evenly as small material B;

[0028] The reducing agent is one or both of vitamin C and sodi...

Embodiment 1

[0035] Add 400 parts of accurately measured deionized water and 400 parts of methallyl polyoxyethylene-oxypropylene polyamine polyether into the four-necked bottle, and put the four-necked bottle into a constant temperature water bath with a temperature of 30°C. After stirring and dissolving, wait until the temperature is stabilized at 30°C, add 1.5 parts of hydrogen peroxide and stir evenly, and start adding small ingredients A and B dropwise after 5 minutes (small ingredient A consists of 20 parts of acrylic acid, 5 parts of methacrylic acid, and 15 parts of acrylamide , 1.5 parts of mercaptopropionic acid was added to 50 parts of deionized water and stirred evenly, small material B was made by adding 0.6 parts of vitamin C to 120 parts of deionized water and stirred evenly), small material A was added for 3 hours, and small material B was dripped Adding time is 4 hours, keep warm for 1 hour after dropping, add 12 parts of sodium hydroxide, adjust pH to 5.45, and prepare supe...

Embodiment 2

[0037] Add 350 parts of accurately measured deionized water and 350 parts of methallyl polyoxyethylene-oxypropylene polyamine polyether into the four-necked bottle, and put the four-necked bottle into a constant temperature water bath with a temperature of 35°C. After stirring and dissolving, when the temperature is stabilized at 35°C, add 1.5 parts of hydrogen peroxide and 0.5 parts of ammonium persulfate and stir evenly. After 5 minutes, add small ingredients A and B dropwise (small ingredient A consists of 15 parts of acrylic acid, 3 parts of methacrylic acid 10 parts of 2-acrylamide-2-methylpropanesulfonic acid, 10 parts of acrylamide, 10 parts of dimethylaminoethyl methacrylate, 1.5 parts of mercaptopropionic acid and 60 parts of deionized water and stir evenly. Material B is made by adding 0.6 parts of vitamin C to 120 parts of deionized water and stirring evenly), the time for adding small material A is 3 hours, and the time for adding small material B is 4 hours. 10 pa...

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Abstract

A super high-early-strength polycarboxylic acid water reducer is disclosed and belongs to the field of concrete admixtures. The water reducer includes, by weight, 300-400 parts of a polyether monomer having a molecular weight of 5000, 450-590 parts of deionized water, 1.5-3 parts of an initiator, 25-35 parts of a monomer C, 15-25 parts of a monomer D, 1.5-2.5 parts of a chain transfer, 0.6-0.9 part of a reductant and a proper amount of an inorganic alkali. Through molecular structure modification, characteristic groups having early strength functions are introduced, and the chain transfer is used to regulate the molecular weight of polymer, and therefore the water reducer has characteristics of a low doping amount, a high water reduction rate, wide adaptability, and capability of allowing a prefabricated part to reach a demoulding strength in prescribed time in a case of no steam curing and to have clean and beautiful appearance.

Description

technical field [0001] The invention relates to a super early strength polycarboxylate water reducer and a preparation method thereof, belonging to the field of concrete admixtures. Background technique [0002] With the continuous development and improvement of concrete technology, concrete, as one of the commonly used building materials, has been widely used in more and more fields. At the same time, the performance of concrete has also put forward higher and higher requirements. Early-strength and ultra-early-strength concrete (UHESC) has broad market application prospects in the construction, maintenance and reinforcement of roads, bridges, ports, subways, prestressed high-strength pipe piles and other projects. [0003] Concrete precast elements require high early strength and short setting time in order to speed up the construction schedule and improve formwork turnover. Compared with naphthalene-based, melamine-based, sulfamate and other water-reducing agents, polyca...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/06C08F220/56C08F220/58C08F220/34C08F220/54C08F222/06C08F222/02C04B24/26C04B103/30
Inventor 王龙飞刘江涛刘杰刘栋田宇董树强李欢欢康静
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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