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Ester-type high-early-strength water reducing agent and preparation method thereof

An early-strength, water-reducing agent technology, applied in the field of building materials, can solve the problems of poor adaptability and insignificant effect of early-strength water-reducing agent, and achieve good compactness, strong steric hindrance and dispersion ability, and reduce capillary pores. effect

Inactive Publication Date: 2016-08-10
SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide an ester-based high-efficiency early-strength water-reducer with ultra-long side chains, which aims to overcome the problems of the current early-strength water-reducer with insignificant effect and poor adaptability, and can effectively improve Early Strength of Concrete

Method used

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  • Ester-type high-early-strength water reducing agent and preparation method thereof
  • Ester-type high-early-strength water reducing agent and preparation method thereof
  • Ester-type high-early-strength water reducing agent and preparation method thereof

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preparation example Construction

[0036] A method for preparing an ester early-strength water reducer is also described, which is characterized in that it includes the following steps:

[0037] a) Esterification reaction

[0038] According to the above parts by weight, polyethylene glycol, catalyst, polymerization inhibitor, and water-carrying agent are added to the reaction kettle, and the temperature is adjusted to 60 ° C. After the reactants are completely dissolved, add acrylic acid or its derivatives, and heat up to 90 ° C. ℃, react for 1-5 hours, and then remove the water-carrying agent. Add the product into a saturated NaCl solution, adjust the pH to neutral after being dissolved, then add ethyl acetate at room temperature, and separate the aqueous layer with only the monoester. Ethyl acetate was added to the aqueous layer and heated to 50°C. After the monoester enters the ethyl acetate layer, add a mixed solution of saturated NaCl and saturated Na2CO3 with a volume ratio of 3:1 at room temperature, r...

Embodiment 1

[0050](1) Esterification reaction: Add 80 parts of polyethylene glycol (molecular weight: 6000), 0.2 part of hydroquinone, 0.3 part of p-toluenesulfonic acid, 40 parts of cyclohexane into a 500ml three-necked flask, and stir with a magnetic force And heat up to 60 ° C, until the dissolution is complete, add 1.2 parts of acrylic acid (or a certain number of methyl acrylate, sodium acrylate, lithium acrylate, methacrylic acid, methyl methacrylate, sodium methacrylate, lithium methacrylate One or more of them), after reacting for 1 to 5 hours, pour the reactant into a spherical flask to distill off cyclohexane under reduced pressure, then add 200 parts of saturated sodium chloride solution, and after the dissolution, use saturated Adjust the pH value to about 8 with sodium carbonate, add 200ml of ethyl acetate under normal temperature conditions, introduce it into a separatory funnel, extract the monoester in the water layer layer by layer, pour it into a spherical flask and disti...

Embodiment 2

[0053] (1) Esterification reaction: Add 90 parts of polyethylene glycol (molecular weight: 8000), 0.3 part of p-toluenesulfonic acid, 0.2 part of hydroquinone, 40 parts of cyclohexane into a 500ml three-necked flask, and stir with a magnetic force And heat up to 60 ° C, until the dissolution is complete, add 1 part of acrylic acid (or a certain number of methyl acrylate, sodium acrylate, lithium acrylate, methacrylic acid, methyl methacrylate, sodium methacrylate, lithium methacrylate One or more of them), after reacting for 1 to 5 hours, pour the reactant into a spherical flask to distill off cyclohexane under reduced pressure, then add 200 parts of saturated sodium chloride solution, and after the dissolution, use saturated Adjust the pH value to about 8 with sodium carbonate, add 200ml of ethyl acetate under normal temperature conditions, introduce it into a separatory funnel, extract the monoester in the water layer layer by layer, pour it into a spherical flask and distill...

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Abstract

The invention discloses an ester-type high-early-strength water reducing agent and a preparation method thereof and relates to the technical field of building materials. The ester-type high-early-strength water reducing agent comprises, by weight, 80-95 parts of polyethylene glycol, 0.5-1.5 parts of acrylic acid or derivatives thereof, 0.1-1.2 parts of substance F, 0.01-0.2 part of substance G, 2-10 parts of substance H, 0.05-2 parts of substance I, 0.1-10 parts of substance J and an appropriate amount of deionized water. The ester-type high-early-strength water reducing agent has the advantages that as compared with polycarboxylic acid with a side chain in normal length, the ester-type high-early-strength water reducing agent has higher steric hindrance dispersing power and can enable water molecules to enter cement particles to guarantee normal hydration of cement; concrete is better in compactibility and fewer capillary pores are formed, so that strength is improved; sulfonate radical adsorption groups are added to make salt resistance of the water reducing agent in the concrete stronger; aminos are introduced to further enhance high-early-strength effect.

Description

technical field [0001] The invention relates to the technical field of building materials, and relates to an ester early-strength water reducer and a preparation method thereof. Background technique [0002] Polycarboxylate superplasticizer is recognized as the third generation concrete superplasticizer in the world. By adjusting the molecular structure, different performance superplasticizers can be obtained, including slow-release type, high water-reducing type, early-strength type, etc. Not only can they reduce the water consumption of concrete, but they can also increase the strength of concrete, playing an essential role in modern architecture. [0003] The third-generation water reducer is obtained by adjusting the polymer synthesis method. The monomer is initiated by the initiator to form a free radical, and the free radical then reacts with different monomers to form a polymer. By adjusting the polymerized monomers, the properties of polymers can be controlled. At ...

Claims

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Application Information

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IPC IPC(8): C08F290/06C08F220/06C08F212/14C08F220/56C04B24/16C04B103/30
CPCC04B24/165C04B2103/302C08F290/062C08F220/06
Inventor 刘昭洋倪涛夏亮亮董树强姚晓鹏刘栋
Owner SHIJIAZHUANG CHANGAN YUCAI BUILDING MATERIALS
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