Viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete

A technology for high-performance concrete and viscous polycarboxylic acid, which is applied in the preparation of this water-reducing agent, and in the field of viscosity-reducing polycarboxylic acid-based high-performance water-reducing agent, can solve the problems of reduction and no description of the preparation process. , to achieve the effect of simple process, obvious viscosity reduction effect and good adaptability

Active Publication Date: 2017-01-04
NANJING HYDRAULIC RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this invention, by introducing and controlling a certain amount of hydrophobic units and hydrophobic groups in the molecular structure of the carboxylic acid copolymer, it can reduce the viscosity of cement-based materials under the action of the water reducing agent, but the random polyoxyalkylene used in it Ether unsaturated esters are temporarily unavailable commercially, and there is no description of the preparation process in the invention

Method used

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  • Viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete
  • Viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete
  • Viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] (1) Preparation of comonomer A: Add 97.5 parts of diethylenetriamine and 115 parts of methanol to a four-necked flask equipped with a thermometer, a stirrer, a constant pressure funnel, a reflux condenser and a water separator, Stir evenly at 30°C; add 287.5 parts of propyl acrylate dropwise in 0.5h~1h; heat up to 50°C~55°C and keep warm for 4h~6h; continue to heat up to 75°C for vacuum distillation to obtain a light yellow comonomer solution .

[0026] (2) Preparation of viscosity-reducing polycarboxylate water reducer: add 27.5 parts of prepared comonomer A, 383.3 parts of methallyl polyoxyethylene polyoxypropylene ether comonomer ( Molecular weight 2400), 5.7 parts of p-methylstyrene and 260 parts of water, heated to 60 ℃ ~ 65 ℃ while stirring, adding 2.40 parts of sodium persulfate; then 62 parts of methacrylic acid, 1.92 parts of mercaptoethanol, 1.44 parts of butyl Make a mixed solution of mercaptan and 203 parts of water, and drop it at a constant rate within 3h...

Embodiment 2

[0028] (1) Preparation of comonomer A: Add 271.5 parts of diethylenetriamine and 115 parts of methanol to a four-necked flask equipped with a thermometer, a stirrer, a constant pressure funnel, a reflux condenser and a water separator, Stir evenly at 30°C; add 113.5 parts of methyl acrylate dropwise in 0.5h-1h; heat up to 50°C-55°C and keep warm for 4h-6h; continue to heat up to 75°C for vacuum distillation to obtain a light yellow comonomer solution .

[0029] (2) Preparation of viscosity-reducing polycarboxylate water reducer: add 18.8 parts of prepared comonomer A, 388.2 parts of isopentenyl polyoxyethylene polyoxypropylene ether comonomer (molecular weight 2400), 11.3 parts of α-methylstyrene and 260 parts of water, heated to 60°C~65°C while stirring, and added 2.36 parts of azobisisobutylimidium hydrochloride; then 23.3 parts of acrylic acid, 31.7 parts of Acid anhydride, 4.76 parts of isopropanol, 1.88 parts of octyl mercaptan, and 198.5 parts of water are mixed into a ...

Embodiment 3

[0031] (1) Preparation of comonomer A: Add 221.3 parts of triethylenetetramine and 115 parts of methanol to a four-necked flask equipped with a thermometer, agitator, constant pressure funnel, reflux condenser and water separator, Stir evenly at 30°C; add 163.7 parts of methyl acrylate dropwise in 0.5h-1h; heat up to 50°C-55°C and keep warm for 4h-6h; continue to heat up to 75°C for vacuum distillation to obtain a light yellow comonomer solution .

[0032] (2) Preparation of viscosity-reducing polycarboxylate water reducer: add 19.4 parts of prepared comonomer A, 378.7 parts of methallyl polyoxyethylene polyoxypropylene ether comonomer ( Molecular weight 3000), 6.6 parts of styrene and 260 parts of water, heated to 60 ℃ ~ 65 ℃ while stirring, added 2.88 parts of ammonium persulfate; then 73.2 parts of fumaric acid, 2.40 parts of thioglycolic acid, 1.92 parts of 3-mercaptopropane A mixed solution of octyl acid and 205.4 parts of water, and drop it at a constant rate within 3h~...

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Abstract

The invention relates to a viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete and a preparing method thereof, and belongs to the field of cement concrete water reducing agents. The preparing method includes the following steps that polyethylene polyamine and alkyl acrylate are used for preparing a comonomer A; the comonomer A, polyoxyethylene-polyoxypropylene comonomer B, a vinyl aromatic compound C and an unsaturated carboxylic monomer are subjected to water-phase free radical polymerization reaction under the action of initiator and a chain transferring agent, and the pH value is adjusted after the reaction is completed to prepare the viscosity reducing polycarboxylate-type water reducing agent. The viscosity reducing polycarboxylate-type water reducing agent for high-performance concrete has the advantages of being high in dispersing performance, obvious in viscosity reducing effect, high in adaptability to cement and particularly suitable for preparing high-strength and ultrahigh-strength concrete and self-compaction concrete. The viscosity reducing polycarboxylate-type water reducing agent is low in requirement for production equipment and simple in process, operation is convenient, which is beneficial for industrial production, and the product is free of chloridion, and does not corrode rebars in the concrete.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to a viscosity-reducing polycarboxylate high-performance water reducer for high-performance concrete, and in particular to a preparation method of the water reducer. Background technique [0002] With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure construction, especially the planning and implementation of the national railway passenger dedicated line network project, the market demand for polycarboxylate water reducers continues to grow. Compared with traditional high-efficiency water reducers, polycarboxylate water reducers have the advantages of low dosage, high water reducing rate, strong slump retention ability, and flexible molecular structure. Adopting a low water-binder ratio is one of the key measures to ensure the strength of concrete and improve the durability of concrete. ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F220/18C08F220/14C08F212/08C08F212/12C08F222/02C08F222/06C04B24/26
CPCC04B24/2694C04B2103/302C08F283/065C08F220/06C08F222/06C08F222/02
Inventor 陈国新祝烨然杜志芹付丹华王冬肖建峰唐修生温金保刘兴荣黄国泓
Owner NANJING HYDRAULIC RES INST
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