Polycarboxylic acid water reducing agent with excellent rust resisting function and preparation method thereof

A technology of polycarboxylic acid and water reducing agent, which is applied in the field of concrete water reducing agent for construction engineering materials, can solve the problems of limited application, concrete cannot be used alone, and has no water reducing function, and achieves simple process, mild reaction conditions, and easy scale The effect of production

Inactive Publication Date: 2010-06-30
肖尾俭
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] For anti-rust products used in concrete, they are mainly composite methods, such as patent application number 200610044239.4 named "a reinforced concrete rust inhibitor", and patent application number 200910008272.5 named "concrete anti-corrosion rust inhibitor" Anti-seepage agent", these products have basically no water-reducing function, and their application is limited. Generally, they cannot be used alone in concrete applications.

Method used

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  • Polycarboxylic acid water reducing agent with excellent rust resisting function and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0017] (1) The first step esterification reaction: 90.0 g of polyethylene glycol monomethyl ether with a molecular weight of 1000, 20.0 g of acrylic acid, 0.12 g of sodium benzoate, 0.36 g of benzotriazole, 1.0 g of 98% concentrated sulfuric acid, press Put the above sequence into a 250ml three-necked flask reaction vessel, heat while stirring, cover the bottle mouth and seal, heat up to 110-120°C, keep warm for 4 hours for esterification reaction, and generate polyethylene glycol triazole-based acrylate a; when the temperature is lowered to 50°C, add 50g of water to dilute the solution to about 70% for later use;

[0018] (2) The second polymerization reaction: Add 60g of bottom water into a 250ml four-necked flask, and when the temperature rises to 90±5°C while stirring, add 110g of the reactant solution of the first step dropwise while adding the mass ratio 37g of 3% ammonium persulfate solution, control the rate of addition, drop it at the same time in about 120 minutes, k...

Embodiment 2

[0020] (1) The first step of esterification reaction: 108.0 g of polyethylene glycol monomethyl ether with a molecular weight of 1200, 22.0 g of acrylic acid, 0.13 g of sodium benzoate, 0.39 g of benzotriazole, 1.1 g of 98% concentrated sulfuric acid, press Put the above sequence into a 250ml three-necked flask reaction vessel, heat while stirring, cover the bottle mouth and seal, heat up to 110-120°C, keep warm for 4 hours for esterification reaction, and generate polyethylene glycol triazole-based acrylate a; when the temperature is lowered to 50°C, add 55g of water to dilute the solution to about 70% for later use;

[0021] (2) The second polymerization reaction: Add 60g of bottom water into a 250ml four-necked flask, and when the temperature rises to 90±5°C while stirring, add 110g of the reactant solution of the first step dropwise while adding the mass ratio 39g of 3% ammonium persulfate solution, control the rate of addition, drop it at the same time in about 120 minute...

Embodiment 3

[0023] (1) The first step of esterification reaction: 120.0 g of polyethylene glycol monomethyl ether with a molecular weight of 1500, 23.0 g of acrylic acid, 0.15 g of sodium benzoate, 0.45 g of benzotriazole, 1.2 g of 98% concentrated sulfuric acid, press Put the above sequence into a 250ml three-necked flask reaction vessel, heat while stirring, cover the bottle mouth and seal, heat up to 110-120°C, keep warm for 4 hours for esterification reaction, and generate polyethylene glycol triazole-based acrylate a; when the temperature is lowered to 50°C, add 60g of water to dilute the solution to about 70% for later use;

[0024] (2) The second polymerization reaction: Add 60g of bottom water into a 250ml four-necked flask, and when the temperature rises to 90±5°C while stirring, add 110g of the reactant solution of the first step dropwise while adding the mass ratio 39g of 3% ammonium persulfate solution, control the rate of addition, drop it at the same time in about 120 minute...

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Abstract

The invention relates to a polycarboxylic acid water reducing agent with an excellent rust resisting function and a preparation method thereof, belonging to the technical field of concrete water reducing agents. The preparation method comprises the following steps of: (1) esterification reaction, i.e. using a 98% concentrated sulfuric acid as a catalyst, sequentially adding polyethylene glycol monomethyl ether, acrylic acid, sodium benzoate and benzotriazole, carrying out the esterification reaction for 4 hours under a sealing condition at 110-120 DEG C so as to obtain a mixture of a polyethylene glycol triazole-group acrylic acid esterified compound and the rest acrylic acid; (2) copolymerization reaction, i.e. using ammonium persulfate as an initiator, and directly copolymerizing the mixture of the polyethylene glycol triazole-base acrylic acid esterified compound and the rest acrylic acid, which is obtained in the step (1), for 3 hours at 90+/-5 DEG C so as to obtain the polycarboxylic acid water reducing agent with a rust resisting group. The invention has the advantages that a polymerization inhibitor does not need to be added any more during the esterification reaction, the catalyst can be finally converted into a part of the water reducing agent; a polymerization-inhibiting functional group triazole-group is directly led during the esterification reaction, thereby product structures are controller and the requirements of product properties are met; more inexpensive acrylic acid is used as a raw material, thereby being beneficial to reducing the cost of the polycarboxylic acid water reducing agent; and in addition, the invention has relatively simpler process and moderate reaction condition and is easy for mass production.

Description

technical field [0001] The invention belongs to a concrete water reducer for construction engineering materials, in particular to the design and preparation method of a polycarboxylate water reducer with excellent antirust function for high performance concrete. Background technique [0002] At present, concrete water reducers at home and abroad are mainly divided into three series: one is lignosulfonate water reducer, the other is sulfonated aromatic polymer water reducer, and the third is polycarboxylate water reducer. Polycarboxylate superplasticizer belongs to the third generation of superplasticizer, which has high water reducing rate, less dosage, suitable for preparing high-performance concrete such as high fluidity and self-compacting. Because the raw materials used have little impact on the environment, the synthesis process is relatively environmentally friendly , basically non-polluting, is considered to be the best type of concrete water reducing agent. [0003]...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F220/06C08F220/36C08G65/48C04B24/26C04B103/30
Inventor 肖尾俭
Owner 肖尾俭
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