Early-strength polycarboxylate superplasticizer and preparation method thereof

A technology of polycarboxylate and water reducer, which is applied in the field of preparation of early-strength polycarboxylate high performance water reducer and water reducer, and can solve the problem of reducing the water reducing performance of polycarboxylate water reducer and concrete There are negative effects on the later strength, and the early strength effect is not obvious, etc., to achieve the effect of good early strength effect, short setting time and simple preparation process

Active Publication Date: 2013-04-03
NANJING RUIDI HIGH TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When inorganic salt or organic early strength agent is used for physical compounding with polycarboxylate-based water-reducer, not only is it prone to delamination, flatulence, poor storage stability, etc., but it will also reduce the water-reducing performance of polycarboxylate-based water-reducer
Sulfates in inorganic salts will greatly increase the alkali content, resulting in potential alkali-aggregate reaction hazards, and sulfates have a negative impact on the later strength of concrete; chloride salts are restricted because they are easy to cause corrosion of steel bars; alcohol amines in organic matter are early-strength The early strength effect is not obvious when the agent is mixed alone, the price is expensive and the dosage is not easy to control

Method used

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  • Early-strength polycarboxylate superplasticizer and preparation method thereof
  • Early-strength polycarboxylate superplasticizer and preparation method thereof
  • Early-strength polycarboxylate superplasticizer and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] Add 310 parts of methallyl polyoxyethylene ether (M W =3000), 4.8 parts of lauryl alcohol and 8 parts of sodium methacrylate, and add 220 parts of water, heat up to 30°C and stir to make it all dissolve in water, heat up to 50°C and add 5.2 parts of tert-butyl hydrogen peroxide and stir Uniform; at the same time, add dropwise a mixed aqueous solution made of 7.8 parts of dihydroxyethylethylenediamine, 48 parts of methacrylic acid and 120 parts of water and a mixed solution made of 1.2 parts of ascorbic acid, 3.2 parts of 3-mercaptopropionic acid and 100 parts of water. Mix the aqueous solution and complete the dropwise addition within 3.5 hours; after the addition, keep at 50°C and continue stirring for 1 hour; after cooling down to room temperature, add 42 parts of liquid caustic soda and 120 parts of water and stir well.

Embodiment 2

[0025] Add 344 parts of methallyl polyoxyethylene ethers (M W =5000), 3 parts of lauryl alcohol and 6.2 parts of sodium allyl sulfonate, and add 220 parts of water, heat up to 30°C and stir to make it all dissolve in water, heat up to 50°C and add 4.5 parts of hydrogen peroxide and stir evenly; Add dropwise a mixed aqueous solution made of 6.4 parts of tetrahydroxyethylethylenediamine, 23 parts of acrylic acid and 120 parts of water and a mixed aqueous solution made of 1.8 parts of ascorbic acid, 2.4 parts of thioglycolic acid and 100 parts of water, dropwise within 3.5 hours Complete; after the addition, keep at 50°C and continue to stir for 1h; after cooling down to room temperature, add 32 parts of liquid caustic soda and 140 parts of water and stir evenly.

Embodiment 3

[0027] Add 330 parts of methallyl polyoxyethylene ether (M W =5000), 6 parts of lauryl alcohol and 6 parts of sodium allyl sulfonate, and add 220 parts of water, heat up to 30°C and stir to make it all dissolve in water, heat up to 50°C and add 4.4 parts of hydrogen peroxide and stir evenly; Add dropwise a mixed aqueous solution made of 7 parts of dihydroxypropyl ethylenediamine, 28 parts of acrylic acid and 120 parts of water and a mixed aqueous solution made of 2.2 parts of ascorbic acid, 3 parts of mercaptoethanol and 100 parts of water, dropwise within 3.5 hours Complete; after the addition, keep at 50°C and continue to stir for 1 hour; after cooling down to room temperature, add 45 parts of liquid caustic soda and 125 parts of water and stir evenly.

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PUM

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Abstract

The invention discloses an early-strength polycarboxylate superplasticizer, which is prepared through aqueous solution polymerization on 75-90% of monomer A, 0.5-2.0% of monomer B, 0.8-3.2% of monomer C, 5-20% of monomer D and 1-3.5% of monomer E under action of an oxidation-reduction system. A preparation method comprises the following steps: 1) putting the monomer A, the monomer B and the monomer E into a reaction kettle, heating to 30 DEG C, stirring to uniformly dissolve into water, heating to 50 DEG C and adding an oxidant; 2) respectively dripping a mixed aqueous solution of the monomer C and the monomer D and a mixed aqueous solution of a reductant and a chain transfer agent, dripping off within 2-4 hours at the same time, maintaining the temperature at 50 DEG C, and further stirring for 1 hour; and 3) cooling to room temperature, adding water and liquid alkali, and regulating pH to 5-6.5 and the solid content to about 40%. The early-strength polycarboxylate superplasticizer has significant early strength enhancing performance, and the middle strength and the later strength thereof are stably improved; and the preparation method is easy to operate, short in production cycle and low in cost.

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures in building materials, in particular to an early-strength polycarboxylate high-performance water reducer, and in particular to a preparation method of the water reducer. Background technique [0002] Compared with traditional naphthalene-based and melamine-based water-reducing agents, polycarboxylate-based water-reducing agents have gradually become a new generation of water-reducing agents that are widely researched and used due to their advantages such as low dosage, high water-reducing rate, and good cement adaptability. . With the rise of my country's nuclear power, water conservancy, bridges, tunnels and other large-scale infrastructure, especially the planning and implementation of the national railway passenger dedicated network project, the market demand for polycarboxylate water reducers continues to grow. At present, the common polycarboxylate superplasticizer has a certain ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B24/26C08F283/06C08F4/40C08F2/38C04B103/30
Inventor 陈国新祝烨然黄国泓沈燕平徐唯唯杨日王冬杜志芹王毅刘兴荣蔡明付丹华
Owner NANJING RUIDI HIGH TECH
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