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Preparation method of low-sensitivity polycarboxylate water reducer

A type of polycarboxylate, low-sensitivity technology, applied in the field of preparation of low-sensitivity polycarboxylate superplasticizer, can solve the problems of strong temperature sensitivity, poor adaptability of machine-made sand, insufficient slump retention, etc., and achieve high chemical stability properties, improved adaptability, and high surface activity

Inactive Publication Date: 2017-12-22
KZJ NEW MATERIALS GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] At present, the mechanism of action and self-sensitivity of polycarboxylate superplasticizers in China cannot be fully controlled
Especially in actual engineering, due to various reasons such as the variety of cement and the mud content of sand and gravel in concrete raw materials, it has been found in a large number of applications that polycarboxylate superplasticizers have insufficient slump retention and temperature sensitivity in high-temperature environments. Strong resistance, strong sensitivity to mud content of sand and gravel aggregates, poor adaptability to machine-made sand, etc., and the amount of polycarboxylate superplasticizer in concrete and the amount of unilateral water increase slightly, the concrete mixture is easy to Bleeding and delamination have adverse effects on the construction performance, mechanical properties and durability of concrete pumping, making it impossible to meet the requirements of the construction site

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] (1) Esterification: Add 110g of lactic acid, 216g of acrylic acid, and 4.32g of hydroquinone into a four-necked flask. Under nitrogen protection, heat up to 60°C, add 3.27g of p-toluenesulfonic acid, heat up to 105°C, and keep warm Reaction 2h, remove water with the method for leading nitrogen band water during, after reaction finishes, drop to room temperature, obtain the first comonomer;

[0023] (2) Sulfonation: Mix 500g of HPEG and 20g of sulfamic acid, raise the temperature to 110°C under the protection of nitrogen, keep the temperature for 5h, cool down to 50°C after the reaction, add 8.3g of liquid caustic soda, and then bring it to room temperature to obtain the first two comonomers;

[0024] (3) Copolymerization: Mix 160g of the second comonomer, 3.5g of the first comonomer, 1g of hydrogen peroxide, and 122g of water, and add dropwise 2-hydroxy-2-sulfinic acid disodium salt solution (0.4g of 2-hydroxy -2-sulfinic acid group acetic acid disodium salt, 24g water...

Embodiment 2

[0026] (1) Esterification: Add 110g of lactic acid, 300g of methacrylic acid, 3.7g of hydroquinone, and 2.06g of phenothiazine into a four-necked flask. Concentrated sulfuric acid, heat up to 95°C, keep warm for 2 hours, remove water by passing nitrogen with water, and cool down to room temperature after the reaction to obtain the first comonomer;

[0027] (2) Sulfonation: Mix 500g of TPEG and 20g of sulfamic acid, raise the temperature to 110°C under the protection of nitrogen, keep the temperature for 5 hours, cool down to 50°C after the reaction, add 8.3g of liquid caustic soda, and then cool to room temperature to obtain the first two comonomers;

[0028] (3) Copolymerization: Mix 160g of the second comonomer, 2g of the first comonomer, 1.5g of hydrogen peroxide, and 124g of water, dropwise add the solution of diaobai (0.55g of diaobai, 24g of water), and dropwise add 21g of the first Comonomer and 2g trifluoroethyl acrylate mixed solution, add dropwise mercaptopropionic ...

Embodiment 3

[0030] (1) Esterification: Add 127g of methyl lactate, 144g of acrylic acid, 86g of methacrylic acid, 3g of hydroquinone, and 1.32g of phenothiazine into a four-necked flask. Under nitrogen protection, heat up to 60°C and add 4g For 98% concentrated sulfuric acid, the temperature was raised to 110°C, and the temperature was kept for 2 hours. During this period, the water was removed by flowing nitrogen with water, and after the reaction was completed, the temperature was lowered to room temperature to obtain the first comonomer;

[0031] (2) Sulfonation: Mix 500g VPEG and 20g sulfamic acid, under the protection of nitrogen, heat up to 110°C, keep warm for 5h, cool down to 50°C after the reaction, add 8.3g liquid caustic soda, and then cool to room temperature to obtain the first two comonomers;

[0032] (3) Copolymerization: Mix 160g of the second comonomer, 3g of the first comonomer, 2g of hydrogen peroxide, and 124g of water, and add dropwise a mixed solution of sodium bisul...

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PUM

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Abstract

The invention discloses a preparation method of a low-sensitivity polycarboxylate water reducer. The preparation method comprises the following steps: (1) esterification, (2) sulfonation, and (3) copolymerization. According to the preparation method, an ester group is introduced through esterification of lactic acid or lactate and unsaturated acid, a long-chain-segment sulfonic acid group is introduced through sulfonation of a macromonomer end group, and a fluorine-containing group is introduced through copolymerization, and a reversible adsorption effect is achieved in a concrete mixture, so that the chemical structure is stable, the polycarboxylate water reducer is insensitive to clay, and the adaptability of the polycarboxylate water reducer to the concrete mixture is improved.

Description

technical field [0001] The invention belongs to the technical field of building admixtures, and in particular relates to a preparation method of a low-sensitivity polycarboxylate water reducer. Background technique [0002] Polycarboxylate-based high-performance water-reducing agent has been widely concerned at home and abroad for its high water-reducing rate, low slump loss, low alkali content, and good compatibility with cement. It has become a research topic in the world in recent years. hotspot. [0003] At present, the mechanism of action and self-sensitivity of polycarboxylate superplasticizers in China cannot be fully controlled. Especially in actual engineering, due to various reasons such as the variety of cement and the mud content of sand and stone in concrete raw materials, it has been found in a large number of applications that polycarboxylate superplasticizers have insufficient slump retention and temperature sensitivity in high-temperature environments. Str...

Claims

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Application Information

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IPC IPC(8): C08F283/06C08F220/28C08F220/22C08F4/40C04B24/16C04B103/30
CPCC04B24/165C04B2103/0059C04B2103/302C08F4/40C08F283/065C08F220/283
Inventor 陈小路方云辉李格丽柯余良蒋卓君麻秀星林祥毅尹峻
Owner KZJ NEW MATERIALS GROUP CO LTD
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