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Preparation method of efficient powdery water reducing agent with siloxane structure

A technology of powdery water reducer and siloxane, which is applied in the field of preparation of high-efficiency powdery water reducer, can solve the defects of polycarboxylate water reducer concrete slump, viscosity, water reducing rate, cumbersome operation process, Affect the later strength and other issues, achieve good water reduction and slump performance, simplify the mixing process, and improve the overall performance

Pending Publication Date: 2022-02-11
SHANXI KAIDI BUILDING MATERIALS +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] However, when adding admixtures, the addition of various admixtures makes the operation process very cumbersome, and it is difficult to accurately control the amount added. It is difficult to accurately control the amount added and affect the later strength, resulting in polycarboxylate superplasticizers in concrete slump , viscosity, water reducing rate and other defects

Method used

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  • Preparation method of efficient powdery water reducing agent with siloxane structure
  • Preparation method of efficient powdery water reducing agent with siloxane structure
  • Preparation method of efficient powdery water reducing agent with siloxane structure

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] Step 1: Pour 200mL tetrahydrofuran into a 250mL narrow-mouth bottle, pour 20g of sodium hydroxide in flake form, and let it stand for 24 hours. Put 2g of sodium in a 250mL round bottom flask, pour about 150mL of tetrahydrofuran treated with NaOH, then add a few zeolite grains, heat and reflux for 30min, change to a distillation device after cooling, receive the distillate near 64~68℃, and store the product Reserve in a grinding bottle.

[0027] The second step: In the dried three-necked flask, add 40.0 mL of tetrahydrofuran obtained in the first step, and then add 1.2 g of methacrylic acid, 20.1 g of methallyl polyoxyethylene ether, 3-(trimethoxysilyl ) Propyl methacrylate 3.4g, 4,4-azobis(4-cyanovaleric acid) 0.13g, stirred vigorously, and protected by nitrogen gas, reacted at 70°C for 5 hours, continued to protect by nitrogen gas and cooled After 24 hours.

[0028] Step 3: Rotate evaporate the reacted mixed solution at 50°C to obtain a colorless viscous liquid.

[...

Embodiment 2

[0032] Step 1: Pour 150mL tetrahydrofuran into a 250mL narrow-mouth bottle, pour 15g of sodium hydroxide in flake form, and let it stand for 24 hours. Put 1.5g of sodium in a 250mL round bottom flask, pour about 160mL of tetrahydrofuran treated with NaOH, then add a few zeolite grains, heat and reflux for 30min, change to a distillation device after cooling, and receive the distillate near 64~68℃, the product Store in a grinding bottle for later use.

[0033] The second step: In the dried three-necked flask, add 35.0 mL of tetrahydrofuran obtained in the first step, and then add 2 g of methacrylic acid, 18.9 g of methallyl polyoxyethylene ether, 3-(trimethoxysilyl ) Propyl methacrylate 3.6g, 4,4-azobis(4-cyanovaleric acid) 0.25g, stirred vigorously, and protected by nitrogen gas, reacted at 70°C for 5 hours, continued to protect by nitrogen gas and cooled After 24 hours.

[0034] Step 3: Rotate evaporate the reacted mixed solution at 50°C to obtain a colorless viscous liquid...

Embodiment 3

[0038] Step 1: Pour 170mL of tetrahydrofuran into a 250mL narrow-mouth bottle, pour 23g of sodium hydroxide into flakes, and let it stand for 24 hours. Put 2.2g of sodium in a 250mL round bottom flask, pour about 150mL of tetrahydrofuran treated with NaOH, then add a few zeolite grains, heat and reflux for 30min, change to a distillation device after cooling, and receive the distillate near 64~68℃, the product Store in a grinding bottle for later use.

[0039] The second step: In the dried three-necked flask, add 50.0 mL of tetrahydrofuran obtained in the first step, and then add 0.8 g of methacrylic acid, 16 g of methallyl polyoxyethylene ether, 3-(trimethoxysilyl) Propyl methacrylate 4g, 4,4-azobis(4-cyanovaleric acid) 0.35g, stirred vigorously, and protected by nitrogen, reacted at 70°C for 5 hours, continued to protect by nitrogen and cooled to 24 after h.

[0040] Step 3: Rotate evaporate the reacted mixed solution at 50°C to obtain a colorless viscous liquid.

[0041]...

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Abstract

The invention discloses a preparation method of an efficient powdery water reducing agent with a siloxane structure, and belongs to the technical field of additives for functional concrete. An organosilicon monomer, methacrylic acid and a metacrylic acid ester monomer are subjected to a ternary polymerization reaction, such that the organosilicon-modified polycarboxylic acid superplasticizer is synthesized; and then star polycarboxylic acid macromolecules are generated through solution reaction to obtain a solid powder product. Silicon-containing active groups are modified on the polycarboxylic acid water reducing agent through organosilane modification, the working performance of the polycarboxylic acid water reducing agent is improved, the prepared powdery water reducing agent has the initial fluidity reaching 260 mm, the fluidity reaching 220 mm after 1 hour and the compressive strength reaching 55 MPa after 7 days through neat paste experiments, the good water reducing and slump retaining performance is achieved, the concrete mixing process is simplified, and the accurate control of the water reducing agent dosage is realized.

Description

technical field [0001] The invention belongs to the technical field of admixtures for functional concrete, and relates to a preparation method of a high-efficiency powdery water reducer with a siloxane structure. Background technique [0002] When mixing concrete, it is usually necessary to add many admixtures such as water reducing agents. It is generally believed that there are three types of action mechanisms of polycarboxylate superplasticizers: steric effect, electrostatic repulsion, and solvated water film effect. According to the theory of electrostatic repulsion, the polar groups in the molecules of conventional polycarboxylate superplasticizers can combine with the surface of cement particles with strong polarity through electrostatic interaction and adsorb on them, forming a surface similar to that formed by general surfactants in solution. The micellar structure plays the role of fully dispersing cement particles and releasing the free water of the flocculation st...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F230/08C04B24/42C04B103/30
CPCC08F283/065C04B24/42C04B2103/302C08F220/06C08F230/085
Inventor 王发洲张平杨锐礼刘鹏田钰靖
Owner SHANXI KAIDI BUILDING MATERIALS
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