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Steady-state polycarboxylate superplasticizer with core-shell structure and preparation method of steady-state polycarboxylate superplasticizer

A technology of superplasticizer and polycarboxylic acid, applied in the field of concrete admixtures, can solve the problems of inability to achieve, waste of slump retention performance, low water reduction performance, etc.

Active Publication Date: 2020-06-30
JIANGSU SOBUTE NEW MATERIALS +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These methods still have problems such as low water-reducing performance caused by too much ester monomer introduced and uneven polymerization caused by insufficient water solubility of ester monomers, and there are also problems due to unreasonable compounding of water-reducing components and slump-preserving components. Leading to problems such as waste caused by excessive dosage or failure of slump retention performance
There is still a lot of room for improvement in the molecular design of the slump-retaining polycarboxylate superplasticizer

Method used

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  • Steady-state polycarboxylate superplasticizer with core-shell structure and preparation method of steady-state polycarboxylate superplasticizer
  • Steady-state polycarboxylate superplasticizer with core-shell structure and preparation method of steady-state polycarboxylate superplasticizer
  • Steady-state polycarboxylate superplasticizer with core-shell structure and preparation method of steady-state polycarboxylate superplasticizer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0076] In a reactor equipped with a thermometer and a stirrer, add 1300g of A-1 (1mol) and 400g of water, heat up to 60°C while stirring to dissolve and stir for 1 hour to prepare pre-emulsion 1. Add 72gB-1 (1mol), 172.2gC-1 (2mol), 12.2gD-1 (0.027mol) and 300g water into the batching kettle, and stir for 1 hour to prepare pre-emulsion 2. After adding 4.56g of 30% hydrogen peroxide to the pre-emulsion 1, the pre-emulsion 2 was continuously added to the reactor with a peristaltic pump, and the feeding time was 2 hours. At the same time, 200 g of an aqueous solution dissolved with 0.71 g of L-ascorbic acid and 6.29 g of mercaptoethanol was continuously added to the reactor with a peristaltic pump, and the feeding time was 2 hours.

[0077] Add 950g of E-1 (1mol) to the reactor at one time, and when the temperature stabilizes to 60°C, start to drop the solution containing 216g of B-1 (3mol), 348g of F-1 (3mol) and 500g of water, and the feeding time is 2 hours . At the same tim...

Embodiment 2

[0079]In a reactor equipped with a thermometer and a stirrer, add 3200g of A-2 (1mol) and 2000g of water, and control the temperature to 10°C while stirring to dissolve and stir for 1 hour to prepare pre-emulsion 1. Add 215g of B-2 (2.5mol), 550.5g of C-2 (5.5mol), 61.2g of D-3 (0.024mol) and 800g of water into the batching kettle, and stir for 1 hour to prepare pre-emulsion 2. After adding 35 g of ammonium persulfate to the pre-emulsion 1, the pre-emulsion 2 was continuously added to the reactor with a peristaltic pump, and the feeding time was 3 hours. At the same time, 900 g of an aqueous solution dissolved with 2.66 g of sodium formaldehyde sulfoxylate and 41.5 g of mercaptopropanol was continuously added to the reactor with a peristaltic pump, and the feeding time was 3 hours.

[0080] Add 2500g of E-2 (1mol) to the reactor at one time, and when the temperature stabilizes to 10°C, start to drop the solution containing 258g of B-2 (3mol), 260g of F-2 (2mol) and 2000g of wa...

Embodiment 3

[0082] In a reactor equipped with a thermometer and a stirrer, add 5500g of A-3 (1mol) and 6000g of water, heat up to 45°C while stirring to dissolve and stir for 1 hour to prepare pre-emulsion 1. Add 464g of B-3 (4mol), 912.8g of C-3 (8mol), 165.2g of D-5 (0.0038mol) and 2400g of water into the batching kettle, and stir for 1 hour to prepare pre-emulsion 2. After adding 102.4 g of sodium persulfate to the pre-emulsion 1, the pre-emulsion 2 was continuously added to the reactor with a peristaltic pump, and the feeding time was 4 hours. At the same time, 2000 g of an aqueous solution dissolved with 10.8 g of sodium bisulfite and 35.9 g of mercaptopropanol was continuously added to the reactor with a peristaltic pump, and the feeding time was 4 hours.

[0083] Add 4050g of E-3 (1mol) to the reactor at one time, and start to drop the solution containing 464g of B-3 (4mol), 504g of F-3 (3.5mol) and 5200g of water when the temperature stabilizes to 45°C. The feeding time is 4 Hour...

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Abstract

The invention discloses a steady-state polycarboxylate superplasticizer with a core-shell structure and a preparation method of the steady-state polycarboxylate superplasticizer. The core structure ofthe steady-state polycarboxylate superplasticizer with the core-shell structure is obtained by emulsion polymerization of a vinyl glycol ether monomer containing hydrophobic chain segments, a derivative monomer A of the vinyl glycol ether monomer, an unsaturated carboxylic acid or an anhydride monomer B, an alkyl acrylate monomer C and an allyl polyether reactive emulsifier D; wherein the shell structure is obtained by polymerizing a vinyl polyethylene glycol ether monomer and a derivative monomer E thereof, an unsaturated carboxylic acid or anhydride monomer B and a (methyl) acrylic acid hydroxyl ester unsaturated small molecular substance F through an aqueous solution. The preparation method of the steady-state polycarboxylate superplasticizer is simple, the initial dispersity is good in engineering use, the fluidity of concrete can be kept for a long time, the workability of the concrete can be remarkably improved, and the steady-state polycarboxylate superplasticizer has excellentmaterial adaptability.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to a polycarboxylate superplasticizer which can significantly prolong the working time of high-performance concrete when applied and a preparation method thereof. Background technique [0002] The development momentum of the construction industry in the world is very rapid. The construction of super high-rise / complex structure buildings, large bridges, nuclear power, hydropower and other major projects puts forward higher requirements for the quality of high-performance concrete and brings great challenges. . The complexity of the structure of structures and the automation of construction methods have gradually increased the difficulty of engineering construction, requiring high-performance concrete to maintain fluidity for a longer period of time, and high-performance concrete itself uses a large number of mineral admixtures and various functional admixtures...

Claims

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Application Information

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IPC IPC(8): C08F285/00C08F283/06C08F220/06C08F220/20C08F222/02C08F222/06C08F222/04C04B24/26C04B103/30
CPCC08F285/00C08F283/065C08F2/38C04B24/2694C04B2103/302C08F220/06C08F220/20C08F222/02C08F222/06C08F222/04Y02W30/91
Inventor 周栋梁杨勇冉千平黄振刘金芝李申桐张志勇舒鑫
Owner JIANGSU SOBUTE NEW MATERIALS
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