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Sorbitol acrylate citric acid modified polycarboxylic acid water reducing agent and preparation method thereof

A technology of sorbitol acrylate and citric acid, which is applied in the field of building materials, can solve the problems of poor adaptability, poor segregation and bleeding workability, insufficient slump retention performance of concrete, etc., and achieves the effects of reasonable design, improved slump retention capability and novel structure

Inactive Publication Date: 2019-04-09
GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a citric acid-modified polycarboxylate water-reducer of sorbitol acrylate and its preparation method, which solves the problem of poor adaptability of existing ether-based polycarboxylate water-reducers and concrete with high mud content. It is prone to defects such as insufficient slump protection performance, segregation bleeding and poor workability, etc.

Method used

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  • Sorbitol acrylate citric acid modified polycarboxylic acid water reducing agent and preparation method thereof

Examples

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Effect test

Embodiment 1

[0019] A citric acid modified polycarboxylate water reducer of sorbitol acrylate is prepared according to the following preparation method, including the synthesis of citric acid of sorbitol acrylate and the process of ternary copolymerization of each unit, the specific steps are as follows:

[0020] (1) Add 124g of ethylene glycol, 316.8g of acrylic acid, 364g of sorbitol, 3.17g of p-toluenesulfonic acid and 2.52g of p-hydroxyanisole into a three-necked round bottom flask equipped with a thermometer and an electric stirrer, stir well and heat To 100°C, react for 8 hours, then cool down to 50°C, add 576g of citric acid, then continue to stir and raise the temperature to 100°C, react for 10 hours, and finally obtain a yellow viscous liquid that is citric acid of sorbitol acrylate.

[0021] (2) Add 250g of water and 320g of polyether macromonomer APEG into a 1000mL four-neck round bottom flask equipped with a thermometer, electric stirrer, constant temperature electric heating ma...

Embodiment 2

[0023] A preparation method of a citric acid-modified polycarboxylate water-reducer of sorbitol acrylate, comprising the synthesis of citric acid of sorbitol acrylate and each unit process of ternary copolymerization, the specific steps are as follows:

[0024] (1) Add 124g of ethylene glycol, 316.8g of acrylic acid, 364g of sorbitol, 3.17g of p-toluenesulfonic acid and 2.52g of p-hydroxyanisole into a three-necked round bottom flask equipped with a thermometer and an electric stirrer, stir well and heat To 100°C, react for 8 hours, then lower the temperature to 50°C, add 576g of citric acid, then continue to heat up to 100°C, react for 10 hours, and finally obtain a yellow viscous liquid that is citric acid of sorbitol acrylate.

[0025] (2) Add 280g of water and 320g of polyether macromonomer HPEG into a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle and a peristaltic pump. The molecular...

Embodiment 3

[0027] A preparation method of a citric acid-modified polycarboxylate water-reducer of sorbitol acrylate, comprising the synthesis of citric acid of sorbitol acrylate and each unit process of ternary copolymerization, the specific steps are as follows:

[0028] (1) Add 124g of ethylene glycol, 316.8g of acrylic acid, 364g of sorbitol, 3.17g of p-toluenesulfonic acid and 2.52g of p-hydroxyanisole into a three-necked round bottom flask equipped with a thermometer and an electric stirrer, stir well and heat To 100°C, react for 8 hours, then lower the temperature to 50°C, add 576g of citric acid, then continue to heat up to 100°C, react for 10 hours, and finally obtain a yellow viscous liquid that is citric acid of sorbitol acrylate.

[0029] (2) Add 270g of water and 300g of polyether macromonomer TPEG to a 1000mL four-necked round-bottomed flask equipped with a thermometer, an electric stirrer, a constant temperature electric heating mantle, and a peristaltic pump. The molecular ...

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Abstract

The invention discloses a sorbitol acrylate citric acid modified polycarboxylic acid water reducing agent. The water reducing agent is a copolymer formed by polymerizing sorbitol acrylate citric acid,acrylic acid, an unsaturated polyether macromonomer, an initiator and a chain transfer agent through a free radical copolymerization reaction; the unsaturated polyether macromonomer is one or two ofallyl polyoxyethylene ether, methylallyl alcohol polyoxyethylene ether and isoamylene polyoxyethylene ether; the initiator is at least one of hydrogen peroxide, ammonium persulfate and potassium persulfate, or any one of hydrogen peroxide, ammonium persulfate and potassium persulfate in combination with at least one of ascorbic acid, sodium formaldehyde sulfoxylate and ferrous sulfate; the chain transfer agent is at least one of mercaptopropionic acid, thioglycolic acid, mercaptoethanol, mercaptoethylamine, sodium methallyl sulfonate, sodium hypophosphite and sodium allylsulfonate. According to the sorbitol acrylate citric acid modified polycarboxylic acid water reducing agent, a hydration film can be generated on the surface of cement particles, and the slump retaining capability of the water reducing agent and the adaptability to the mechanical sand of different flooring materials and the retarding effect on the concrete can be further improved.

Description

technical field [0001] The invention belongs to the technical field of building materials, and in particular relates to a citric acid-modified polycarboxylate water reducer of sorbitol acrylate and a preparation method thereof. Background technique [0002] In recent years, with the continuous expansion of the scale of civil engineering and the continuous improvement of the level of science and technology, some important buildings with high-rise, long-span and special functional requirements continue to appear, such as skyscrapers, super-long-span bridges, high-speed railways and giant water conservancy projects. Construction, etc. , requiring concrete to have higher strength, better durability, and better stability. Water reducing agent is one of the indispensable important components of high performance concrete. Water reducing agent can reduce the water consumption of concrete during use, improve its durability, improve the collapse retention, change the properties of con...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/20C04B24/26C04B103/30
CPCC04B24/2694C04B2103/0059C04B2103/302C08F283/065C08F220/06C08F222/1006
Inventor 许志顺陈娟李本秀万国君王毓蒋天福穆黔
Owner GUIZHOU TIEJIANHENGFA NEW MATERIAL TECH CO LTD
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