Early-strength type polycarboxylate superplasticizer and preparation method and application thereof

A technology of polycarboxylic acid and water reducer, which is applied in the field of concrete admixtures, can solve the problems of poor strength, accelerated cement hydration, and high cost, and achieve excellent fluidity, early strength, enhanced repellency, and improved The effect of early strength performance

Active Publication Date: 2019-05-24
联泓(江苏)新材料研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

When the volume is about 6%, the water reducing rate is 20-28%, and the 1d compressive strength is increased to 41%-48%, but it does not play a good role in the strength of concrete after 7d.
CN101024565A discloses an early-strength composite water-reducer obtained by compounding early-strength components such as anhydrous calcium chloride, triethanolamine, and sodium benzoate, which can improve compressive strength to a certain extent, but contains chloride salts, which are harmful to steel bars. Concrete is corroded
[0005] European patent EP1980541 discloses a new type of high-performance polycarboxylate water reducer with polyamide-polyethylene glycol branched chains. Polyamine groups are introduced into the water reducer molecules. When the water-cement ratio of concrete is as low as 0.15, it still has Good fluidity and flow retention, showing ultra-high early strength in ready-mixed concrete, but the synthesis steps of macromonomers of this structure are complicated, difficult to prepare, high in cost, and cannot be industrialized
CN105199032A discloses a super-early-strength polycarboxylate water reducer. The technical scheme is synthesized from polyether macromonomers, and cations are introduced into the molecules, thereby reducing the adsorption of soil to additives and accelerating the hydration of cement Effect, has super early strength effect, but the polymerization temperature is 85-95°C, the temperature is high, it is difficult to control, and the retention ability is poor

Method used

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  • Early-strength type polycarboxylate superplasticizer and preparation method and application thereof
  • Early-strength type polycarboxylate superplasticizer and preparation method and application thereof
  • Early-strength type polycarboxylate superplasticizer and preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] At 20°C, 87g of methallyl polyoxyethylene polyether (molecular weight: 2400) was dissolved in 60g of water in a kettle, 0.8g of mercaptoacetic acid and 0.3g of L-ascorbic acid were added, and then 6g of acrylic acid, Mixture of 7g 3-(diallylamino)-2-hydroxypropyl sodium sulfonate, 1.5g hydrogen peroxide (30% by mass aqueous solution), and 40g water, the time for adding is 2h, and aging for 1h after the addition is completed , and cooled to room temperature to obtain the early-strength superplasticizer product S1.

[0049] Product S1 is characterized by infrared spectroscopy, and the infrared spectrum is 3440.22cm -1 It is the stretching vibration of O-H; 2871.21cm -1 and 2873.44cm -1 The strong absorption peak is -CH 2 The stretching vibration of - and -CH 3 Bending vibration; 1731.25cm -1 The strong absorption peak is the vibration peak of C=O, 1185.15cm -1 for-SO 3 Stretching vibration of Na, 1105.45cm -1 and 1259.68cm -1 The strong absorption peak at -C-O-C-...

Embodiment 2

[0052] Under the condition of 10°C, 90g of methallyl polyoxyethylene polyether (molecular weight: 2000) was dissolved in 60g of water in a kettle, and 0.1g of mercaptoacetic acid and 1.0g of L-ascorbic acid were added, followed by the dropwise addition of 2g of acrylic acid, A mixture of 8g 3-(diallylamino)-2-hydroxypropyl sodium sulfonate, 3.3g hydrogen peroxide (30% by mass aqueous solution), and 40g water, the time for the dropwise addition is 2h, after the dropwise addition is completed, mature for 2h , and cooled to room temperature to obtain the early-strength water reducer product S2.

[0053] Product S2 is characterized by infrared spectroscopy, and the infrared spectrum is 3441.86cm -1 It is the stretching vibration of O-H; 2871.88cm -1 and 2873.64cm -1 The strong absorption peak is -CH 2 The stretching vibration of - and -CH 3 Bending vibration; 1731.75cm -1 The strong absorption peak is the vibration peak of C=O, 1185.60cm -1 for-SO 3 Stretching vibration of ...

Embodiment 3

[0056] At 40°C, put 82g of methallyl polyoxyethylene polyether (molecular weight: 5000) in a kettle and dissolve it in 60g of water, add 1.0g of mercaptoacetic acid, 0.02g of L-ascorbic acid, and then start to drop 9g of sodium acrylate , the mixed solution of 9g 3-(diallylamino)-2-hydroxypropyl sulfonate, 0.33g hydrogen peroxide (30% by mass aqueous solution), 40g water, the time for adding is 2h, and ripening after the addition is completed After 1 hour, cool to room temperature to obtain the early-strength water reducer product S3.

[0057] The product S3 is characterized by infrared spectroscopy, and the infrared spectrum is 3441.16cm -1 It is the stretching vibration of O-H; 2871.28cm -1 and 2873.34cm -1 The strong absorption peak is -CH 2 The stretching vibration of - and -CH 3 Bending vibration; 1556.25cm -1 The strong absorption peak is the vibration peak of C=O, 1186.45cm -1 for-SO 3 Stretching vibration of Na, 1104.85cm -1 and 1258.54cm -1 The strong absorpt...

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Abstract

The invention belongs to the technical field of concrete admixtures, and discloses an early-strength type polycarboxylate superplasticizer and a preparation method and application thereof. The early-strength type polycarboxylate superplasticizer comprises a structural unit A shown in the formula I, a structural unit B shown in the formula II and a structural unit C shown in the formula III. Base on the total weight of the early-strength type polycarboxylate superplasticizer, the weight content of the structural unit A is 76-96%, the weight content of the structural unit B is 0.8-12%, and the weight content of the structural unit C is 0.8-12%. The early-strength type polycarboxylate superplasticizer is high in early strength performance and suitable for the field of early-strength type concrete. (The formulas are shown in the description.).

Description

technical field [0001] The invention belongs to the technical field of concrete admixtures, and in particular relates to an early-strength polycarboxylate water reducer and its preparation method and application. Background technique [0002] Polycarboxylate superplasticizer is a new type of superplasticizer developed in recent years. Compared with traditional lignosulfonate, naphthalenesulfonate, melamine and sulfamate, it has low dosage, high Water content, high slump retention, low alkali, environmental protection, and large degree of freedom in molecular design have been widely used in concrete engineering. However, while having excellent performance, the polycarboxylate superplasticizer also significantly delays the hydration of cement and affects the development of early strength. Especially in prefabricated components, the retarding effect makes the production cycle longer, the maintenance cost increases, and reduces Productivity. [0003] The development of polycar...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F226/02C04B24/16C04B103/30
Inventor 张文龙杜迎吉张俊朱军成李方
Owner 联泓(江苏)新材料研究院有限公司
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