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A kind of special small molecular superplasticizer for medium and low slump concrete and preparation method thereof

A superplasticizer and small molecule technology, applied in the field of concrete admixtures, can solve the problems of difficult industrialization, unenvironmental protection of the production process, high price and cost of amino polyether, and achieve stable skeleton structure, green production process, and static electricity Significant effect of repulsion

Active Publication Date: 2020-11-17
NANJING BOTE BUILDING MATERIALS CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0010] Although the above research work has made a breakthrough innovation on the structure of the water reducing agent and achieved ideal results, the defects are also obvious. The production process uses a large amount of formaldehyde and chlorinated reagents, which leads to the production process is not environmentally friendly. In addition, the raw material amino polyether is expensive and difficult to realize. industrialization

Method used

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  • A kind of special small molecular superplasticizer for medium and low slump concrete and preparation method thereof
  • A kind of special small molecular superplasticizer for medium and low slump concrete and preparation method thereof
  • A kind of special small molecular superplasticizer for medium and low slump concrete and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Add 100g (0.1mol) of methoxypolyether (ethylene oxide is the polymer monomer, the molecular weight of polyether is 1000) and 1.5g (0.01mol) of CsOH into the reaction kettle, under the condition of -0.08~-0.1MPa , Stir the reactor and raise the temperature to 60°C for 1h of dehydration. After the pretreatment is over, turn off the vacuum pump, wait until the pressure of the reactor returns to 0MPa, raise the temperature to 120°C, slowly add 29.6g (0.4mol) glycidyl ether dropwise through the peristaltic pump, control the dropping time for 10h, then keep the temperature for 2h, and keep the reaction The temperature is reduced and the volatile substances are removed by vacuuming to obtain terminal hyperbranched polyether. Next, weigh 58.8g (0.51mol P) of 85% phosphoric acid, add it into the above reaction kettle, keep the reaction temperature of 80°C and the reaction pressure of -0.05~-0.1MPa, and continue the reaction for 4h. After the reaction is finished, remove the ins...

Embodiment 2

[0041] Add 400g (0.1mol) of methoxypolyether (propylene oxide is the polymerized monomer, the molecular weight of the polyether is 4000) and 1.1g (0.02mol) of KOH into the reactor, under the condition of -0.08~-0.1MPa, Stir the reaction kettle and raise the temperature to 70°C for reaction and dehydration for 1h. After the pretreatment is finished, turn off the vacuum pump, wait until the pressure of the reactor returns to 0MPa, raise the temperature to 140°C, slowly add 37.0g (0.5mol) glycidyl ether dropwise through the peristaltic pump, control the dropping time for 11h, then keep the temperature for 3h, and keep the reaction The temperature is reduced and the volatile substances are removed by vacuuming to obtain terminal hyperbranched polyether. Next, weigh 44.7g (0.63mol P) of phosphorus pentoxide, add it into the above reaction kettle, keep the reaction temperature of 110°C and the reaction pressure of -0.05~-0.1MPa, and continue the reaction for 6h. After the reaction ...

Embodiment 3

[0043] Add 1200g (0.1mol) of methoxypolyether (ethylene oxide and propylene oxide are polymerized monomers, and the molecular weight of polyether is 12000) and 3.0g (0.02mol) of CsOH into the reaction kettle, at -0.08~- Under the condition of 0.1MPa, the reactor was stirred and heated to 100°C for 3 hours of dehydration. After the pretreatment is over, turn off the vacuum pump, wait until the pressure of the reactor returns to 0MPa, raise the temperature to 140°C, slowly add 59.3g (0.8mol) glycidyl ether dropwise through the peristaltic pump, control the dropping time for 14h, then keep the temperature for 5h, and keep the reaction The temperature is reduced and the volatile substances are removed by vacuuming to obtain terminal hyperbranched polyether. Next, weigh 114.1g (0.99mol P) of 85% phosphoric acid, add it into the above reaction kettle, keep the reaction temperature of 120°C and the reaction pressure of -0.05~-0.1MPa, and continue the reaction for 7h. After the react...

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Abstract

The invention discloses a special micromolecular super-plasticizing agent for concrete with medium and low slump and a preparation method thereof. The special micromolecular super-plasticizing agent is prepared by the following steps of pretreating monomethoxy polyether and a base catalyst under the vacuum condition, and slowly dripping glycidyl ether into a pretreated solution, so as to obtain the terminal hyperbranched polyether; adding a phosphate esterification reagent into the terminal hyperbranched polyether to react, so as to obtain a finished product, namely the micromolecular super-plasticizing agent. The synthesized micromolecular super-plasticizing agent has the advantages that the framework structure is stable, the water reduction rate is proper, and the slump protection property is excellent. The synthesizing technology has the advantages that the green and environment-friendly effects are realized, the cost of raw materials is low, the preparation is simple, the efficiency is high, the reaction can be continuously performed in one reaction kettle, the reaction efficiency is conveniently improved, the reaction time is shortened, and the large-scale industrialized production is realized.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, in particular to a preparation method of a special small molecular phosphoric acid-based superplasticizer for medium and low slump concrete. Background technique [0002] Concrete is the most widely used construction material in the world today. Since entering the 21st century, my country's infrastructure has been developing vigorously, and the demand for concrete admixtures is also growing rapidly. Among the admixtures, the water reducer is used as an admixture to enhance the fluidity of cement and concrete, reduce water consumption, and increase strength. Its development and application technology has attracted much attention. Among them, the high-performance water-reducing agent represented by polycarboxylic acid has attracted extensive attention from the academic circles and the industry due to its high water-reducing performance, low dosage, high slump retention and molecular de...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08G65/335C08G65/28C04B24/26C04B103/32
CPCC04B24/32C04B2103/0061C04B2103/32C08G65/2609C08G65/3353
Inventor 亓帅韩正冉千平杨勇王涛范士敏马建峰
Owner NANJING BOTE BUILDING MATERIALS CO LTD