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Preparation method for polycarboxylic acid water reducer with strong adaptability

A polycarboxylate-based, adaptable technology, applied in the field of concrete water-reducing agents, can solve problems such as bleeding, segregation, and differences in cement adaptability, and achieve excellent product performance, reasonable preparation process, and good slump performance. Effect

Active Publication Date: 2012-04-11
云浮市鸿源混凝土有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the following problems generally exist in the process of use: (1) There are differences in adaptability to cement of different varieties and grades
(2) It is sensitive to the mud content of sand and gravel. When the mud content is greater than 3%, the water reducing effect will drop significantly, and it may even be unusable.
(3) It is easy to produce bleeding, slurry and segregation
These problems all restrict the wide application of polycarboxylate water reducer in engineering.

Method used

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  • Preparation method for polycarboxylic acid water reducer with strong adaptability

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] 1) Preparation of macromer butanol methacrylate random polyether ester

[0020] Add 65 parts of butanol atactic polyether and 0.50 parts of hydroquinone into the reaction kettle in parts by mass, stir and raise the temperature to 60°C, slowly add 10.30 parts of methacrylic acid and 2.30 parts of concentrated sulfuric acid dropwise, and keep warm for half an hour Raise the temperature to 90°C, add 34 parts of cyclohexane, continue to reflux for 6 hours, carry out distillation to recover cyclohexane, and then cool to room temperature to obtain the macromonomer butanol atactic polyether methacrylate;

[0021] 2) Preparation of strong adaptability and high efficiency polycarboxylate water reducer

[0022] Add 18 parts of macromonomer butanol atactic polyether methacrylate and 30 parts of deionized water in parts by mass into a reactor with a stirring device;

[0023] 1.30 parts of itaconic acid, 0.10 parts of sodium methacrylate and 0.05 parts of ethyl acrylate were dissol...

Embodiment 2

[0027] 1) Preparation of macromer butanol methacrylate random polyether ester

[0028] Add 70 parts of butanol atactic polyether and 0.60 parts of hydroquinone into the reaction kettle in parts by mass, stir and raise the temperature to 60°C, slowly add 13.56 parts of methacrylic acid and 2.30 parts of concentrated sulfuric acid dropwise, and keep warm for half an hour Raise the temperature to 95°C, add 36 parts of cyclohexane, continue to reflux for 6 hours, carry out distillation to recover cyclohexane, and then cool to room temperature to obtain the macromonomer butanol atactic polyether methacrylate;

[0029] 2) Preparation of strong adaptability and high efficiency polycarboxylate water reducer

[0030] In parts by mass, 21 parts of macromonomer butanol atactic polyether methacrylate and 35 parts of deionized water are added to a reactor with a stirring device;

[0031] 2.60 parts of itaconic acid, 0.21 parts of sodium methacrylate and 0.10 parts of ethyl acrylate were d...

Embodiment 3

[0035] 1) Preparation of macromer butanol methacrylate random polyether ester

[0036] Add 75 parts of butanol atactic polyether and 0.65 parts of hydroquinone into the reaction kettle in parts by mass, stir and raise the temperature to 60°C, slowly add 16.00 parts of methacrylic acid and 2.30 parts of concentrated sulfuric acid dropwise, and keep warm for half an hour Raise the temperature to 100°C, add 38 parts of cyclohexane, continue to reflux for 6 hours, carry out distillation to recover cyclohexane, and then cool to room temperature to obtain the macromonomer butanol atactic polyether methacrylate;

[0037] 2) Preparation of strong adaptability and high efficiency polycarboxylate water reducer

[0038] Add 24 parts of macromonomer butanol atactic polyether methacrylate and 40 parts of deionized water into a reactor with a stirring device in parts by mass;

[0039] 3.90 parts of itaconic acid, 0.41 parts of sodium methacrylate and 0.15 parts of ethyl acrylate were disso...

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Abstract

The invention relates to a preparation method for polycarboxylic acid water reducer with strong adaptability. Self-produced macromonomer methacrylic acid butanol random polyether ester and itaconic acid, sodium methallyl sulfonate and ethyl acrylate are initiated by ammonium persulfate to prepare a polycarboxylic acid water reducer through free radical copolymerization reaction. The innovation ofthe preparation method for polycarboxylic acid water reducer with strong adaptability is that methacrylic acid and butanol random polyether ester are used for preparing propenyl ester macromonomer, then the macromonomer is copolymerized with itaconic acid and ethyl acrylate to prepare the polycarboxylic acid water reducer with strong adaptability to cement and gravels comprising mud. The preparation method for polycarboxylic acid water reducer with strong adaptability has the advantages of better adaptability on cement and gravels comprising mud, low mixing amount and high water reducing rate; the initial fluidity of the neat cement paste can be more than 290mm (W / C is equal to 0.29) and the slump retaining performance of concrete patching is good; moreover, the preparation method for polycarboxylic acid water reducer with strong adaptability has the advantages of easily obtained materials, reasonable preparation technology, no pollution during the preparation process and excellent product performance. Moreover, the preparation method for polycarboxylic acid water reducer with strong adaptability is suitable for industrialized production.

Description

technical field [0001] The invention belongs to the technical field of concrete water reducers, and in particular relates to a preparation method of a highly adaptable polycarboxylate water reducer used in concrete construction. Background technique [0002] Water reducer is an important additive that must be used in modern concrete technology. Its main function is to improve the mechanical properties of concrete by reducing mixing water on the premise of ensuring good construction performance of concrete, so as to meet the performance requirements of social development for concrete. At present, more than 80% of the water reducing agents used in concrete in my country are second-generation water reducing agents such as naphthalene series and sulfamate. The water reducing rate of this water reducing agent is less than 25%, which cannot meet the requirements of high performance concrete for water reducing In addition, formaldehyde is used in the preparation of naphthalene-based...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F290/06C08F222/02C08F228/02C08F220/18C08G65/00C04B24/16C04B103/30
Inventor 吕生华李第
Owner 云浮市鸿源混凝土有限公司
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