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Early strength polycarboxylic acid high performance dehydragent and method for preparing same

A water-reducing agent and early-strength technology, applied in the field of early-strength polycarboxylate high-performance water-reducing agents, can solve problems such as alkali-aggregate reaction, steel corrosion, etc., and achieve small dosage, high water-reducing rate, and Good workability

Inactive Publication Date: 2008-10-22
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] According to the composite principle and functional design principle of composite admixtures, the present invention has invented a polycarboxylate high-performance water-reducer with excellent water-reducing effect and significantly improved early strength for ordinary portland cement concrete, which overcomes the traditional early Strong composite water reducer is prone to steel corrosion, alkali aggregate reaction and other defects

Method used

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  • Early strength polycarboxylic acid high performance dehydragent and method for preparing same
  • Early strength polycarboxylic acid high performance dehydragent and method for preparing same
  • Early strength polycarboxylic acid high performance dehydragent and method for preparing same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] Carry out the synthesis of acrylic polycarboxylate superplasticizer according to the following steps:

[0018] The first step of esterification reaction: add 100 grams of methoxypolyethylene glycol with a molecular weight of M=1000 in the reaction kettle, heat and stir until fully melted, and control the temperature at 130 ° C, add 0.014 grams of hydroquinone as a polymerization inhibitor, and react After 15 minutes, 14.4 grams of acrylic acid, 1.14 grams of p-toluenesulfonic acid, and 23 grams of cyclohexane were subjected to esterification in sequence; after 4.5 hours of constant temperature reaction, the aqueous agent cyclohexane was removed by vacuuming to obtain a large single Bulk methoxypolyethylene glycol acrylate.

[0019] The second step of polymerization reaction: put the macromonomer obtained in the first step reaction into a four-necked flask, add 150.52 grams of water after heating and melting, raise the temperature to 65°C, stir and dissolve it, and then ...

Embodiment 2

[0022] Synthesize according to Example 1 to obtain an acrylic polycarboxylate superplasticizer, and dilute the resulting 40.0% solution to 20.0%.

[0023] Weigh 40 grams of acrylic polycarboxylate water reducer with a concentration of 20% and place it in a glass container, then add 35.0 grams of water, 1.5 grams of triethanolamine, 2.5 grams of sodium thiocyanate, and 21.0 grams of calcium nitrate in a stirring state. , fully dissolved and left to stand to get early-strength polycarboxylate composite high-efficiency water reducer. Solid content 27%, pH 7.1, clear light brown appearance, dosage 2.0%;

Embodiment 3

[0025] Synthesize according to Example 1 to obtain an acrylic polycarboxylate superplasticizer, and dilute the resulting 40.0% solution to 20.0%.

[0026] Weigh 50 grams of acrylic polycarboxylate water reducer with a concentration of 20% and place it in a stainless steel container, then add 21.5 grams of water, 2.5 grams of triethanolamine, 5 grams of sodium thiocyanate, and 21.0 grams of calcium nitrate in a stirring state. , fully dissolved and left to stand to obtain a light brown and clear early-strength polycarboxylate composite high-efficiency water reducer. Solid content 33.5%, pH 7.2, clear light brown appearance, dosage 2.0%;

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Abstract

The invention relates to a high performance early-strength polycarboxylate water reducer and a preparation method thereof, which pertains to the water reducer field. The early-strength water reducer is prepared mainly based on graft copolymeric carboxylic polymer and compounded with a preferred early strength component; wherein, the copolymeric carboxylic polymer refers to the polymer polymerized by methoxy polyethylene glycol acrylate and acrylic acid / methyl acrylic acid through a free radical initiator in water. The high performance early-strength polycarboxylate water reducer prepared by the invention is characterized by small doping, low alkaline content, no chloride ion and no sulfate, etc., and does not result in the corrosion and alkali aggregate reaction, etc., of the steel bars in the concrete structure, which is helpful for guaranteeing the duration of the concrete structure. The high performance early-strength polycarboxylate water reducer manufactured by the invention can be widely applied to the construction of various concrete projects and the construction of concrete at low temperature, and is particularly suitable for the low energy consumptive production technique of prefabricated concrete members and has a promising application prospect.

Description

technical field [0001] The invention relates to an early-strength polycarboxylate high-performance water-reducer for ordinary silicate concrete. Background technique [0002] In recent years, as my country's economy has entered a new period of sustained, rapid and healthy development, my country's investment in infrastructure construction such as housing, transportation, water conservancy and hydropower has continued to increase, and higher requirements have been put forward for concrete admixtures. On the one hand, it is required to have excellent On the other hand, it is necessary to ensure the durability of the concrete structure. [0003] In many projects, due to certain particularities, it is clearly stated that the construction must be completed within a very short period of time, which requires the addition of concrete early strength agents to accelerate cement hydration and increase the speed of concrete strength development, thereby accelerating Construction progres...

Claims

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Application Information

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IPC IPC(8): C04B24/24C04B24/12C04B22/14C04B103/30
CPCC04B2103/302C04B40/0039
Inventor 王子明刘进强崔素萍兰明章王亚丽孙俊
Owner BEIJING UNIV OF TECH
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