Polycarboxylic acid water reducer for finish concrete and preparation method of water reducer

The technology of fair-faced concrete and polycarboxylic acid series is applied in the field of concrete admixtures, which can solve the problems of loss of initial workability of fresh concrete, severe delamination of concrete appearance, and influence on concrete construction quality, etc., and achieves good encapsulation and no solvent. Simple and common effects of poisoning and reacting raw materials

Active Publication Date: 2015-05-06
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, ordinary polycarboxylate water-reducers are used in most of the clear-water concrete preparations. The use of this type of water-reducer often has the following problems: when the polycarboxylate water-reducer used in pumping concrete is used , good workability of fresh concrete can be obtained, but it is often achieved by introducing air bubbles, which will eventually cause more apparent air bubb

Method used

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  • Polycarboxylic acid water reducer for finish concrete and preparation method of water reducer
  • Polycarboxylic acid water reducer for finish concrete and preparation method of water reducer
  • Polycarboxylic acid water reducer for finish concrete and preparation method of water reducer

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] 1) Add 103 grams of diethylenetriamine and 55 grams of water to a 500 mL four-necked flask equipped with a stirrer, thermometer and water separator, and add 103 grams of maleic anhydride and 1.5 grams of p-toluenesulfonic acid in five times within 1 hour ;

[0031] 2) Heat up to 90°C and continue stirring for 0.5h, then continue to heat up to 110°C-120°C and keep warm for 2h-5h until the water in the solution evaporates to dryness;

[0032] 3) Cool down to 60°C and add 170 grams of water to prepare a bright red viscous prepolymer solution (PP-1);

[0033] 4) Add 200 grams of hydroxybutyl vinyl polyoxyethylene ether (molecular weight is 2000), 23.8 grams of PP-1, 6.3 grams of sodium methacrylate and 120 grams of water in a four-necked flask equipped with a stirrer and a thermometer, Heat up to 45°C to 50°C, add 1.9 grams of 30% hydrogen peroxide and stir for 15 minutes, add 23.8 grams of acrylic acid, 0.7 grams of sodium formaldehyde sulfoxylate and 1.1 grams of 3-merca...

Embodiment 2

[0036] 1) Add 103 grams of diethylenetriamine and 55 grams of water to a 500 mL four-necked flask equipped with a stirrer, thermometer and water separator, and add 98 grams of maleic anhydride and 1.8 grams of sulfamic acid in five times within 1 hour;

[0037] 2) Heat up to 90°C and continue stirring for 0.5h, then continue to heat up to 110°C-120°C and keep warm for 2h-5h until the water in the solution evaporates to dryness;

[0038] 3) Cool down to 60°C and add 165 grams of water to prepare a bright red viscous prepolymer solution (PP-2);

[0039] 4) Add 200 grams of methylbutenyl polyoxyethylene ether (molecular weight is 2400), 19.2 grams of PP-2, 5.2 grams of 2-acrylamide-2-methylpropanesulfonate into a four-necked flask equipped with a stirrer and a thermometer Acid and 120 grams of water, heated to 45 ℃ ~ 50 ℃, add 1.8 grams of 30% hydrogen peroxide and stir for 15 minutes, 22.9 grams of methacrylic acid, 0.8 grams of L-ascorbic acid and 0.9 grams of mercaptoethanol p...

Embodiment 3

[0042] 1) Add 108 grams of diethylenetriamine and 55 grams of water to a 500 mL four-necked flask equipped with a stirrer, thermometer and water separator, and add 98 grams of maleic anhydride and 1.9 grams of p-toluenesulfonic acid in five times within 1 hour ;

[0043] 2) Heat up to 90°C and continue stirring for 0.5h, then continue to heat up to 110°C-120°C and keep warm for 2h-5h until the water in the solution evaporates to dryness;

[0044] 3) Cool down to 60°C and add 165 grams of water to prepare a bright red viscous prepolymer solution (PP-3);

[0045] 4) Add 200 grams of methylbutenyl polyoxyethylene ether (molecular weight is 3200), 10.4 grams of PP-3, 4.9 grams of sodium methacrylate and 120 grams of water in a four-necked flask equipped with a stirrer and a thermometer, Heat up to 45°C-50°C, add 1.7g of 30% hydrogen peroxide and stir for 15min, mix 15.8g of acrylic acid, 1.0g of sodium formaldehyde sulfoxylate and 1.0g of thioglycolic acid with 118g of water to f...

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PUM

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Abstract

The invention discloses a preparation method of a polycarboxylic acid water reducer for finish concrete. The preparation method comprises the following steps: (1) allowing diethylenetriamine and maleic anhydride to react under the action of a catalyst to prepare a bright red viscous pre-polymer solution; and (2) copolymerizing the pre-polymer solution, unsaturated polyoxyethylene ether, a sulfoacid monomer and unsaturated carboxylic acid under the action of a redox initiation system and a chain transfer agent to prepare a polycarboxylic acid type water reducer for finish concrete. The water reducer and one or more of a defoaming agent, an air entraining agent, a retarder and a viscosity adjusting agent are compounded and then doped into concrete to prepare finish concrete which is high in construction performance, excellent in wrapping property and can be used for realizing the mirror effect.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, and in particular relates to a polycarboxylate water-reducer for fair-faced concrete, a preparation method thereof, and clear-water concrete prepared by using the water-reducer. Background technique [0002] With the vigorous development of national infrastructure, the construction of urban bridges has increased significantly, and people's requirements for the appearance and quality of urban roads and bridges have become more and more stringent. At present, many master builders in the world use the fair-faced concrete process in their design schemes, such as I.M. Pei, Tadao Ando, ​​etc., all use fair-faced concrete in large quantities in their designs. Foreign countries began to use fair-faced concrete as early as the Japanese Olympic Stadium in the 1960s, and later developed to the exterior walls of the Sydney Opera House, the National Grand Theater of Japan, th...

Claims

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Application Information

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IPC IPC(8): C04B24/32C04B103/30
Inventor 陈国新祝烨然刘兴荣王凤王冬蔡明杜志芹付丹华黄国泓
Owner NANJING RUIDI HIGH TECH
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