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Solid polycarboxylate superplasticizer as well as preparation method and application thereof

A technology of water reducer and polycarboxylic acid, which is applied in the field of solid polycarboxylate water reducer and its preparation, and can solve the problems of increasing preparation cost and the like

Active Publication Date: 2018-05-29
联泓(江苏)新材料研究院有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

This further increases the cost of preparation

Method used

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  • Solid polycarboxylate superplasticizer as well as preparation method and application thereof
  • Solid polycarboxylate superplasticizer as well as preparation method and application thereof
  • Solid polycarboxylate superplasticizer as well as preparation method and application thereof

Examples

Experimental program
Comparison scheme
Effect test

preparation example 1

[0066] With reference to the method described in Example 3 and Example 4 in patent document CN201510041919.X, with 2-methallyl alcohol or 3-methyl-3-butene-1-alcohol as initiator, the mass ratio of propylene oxide (PO): ethylene oxide (EO) = 21.5:100, and a liquid unsaturated polyether macromonomer with a molecular weight of 2400 was prepared.

Embodiment 1

[0068] The liquid unsaturated polyether macromonomer (molecular weight is 2400) prepared with 3-methyl-3-buten-1-ol as starter in 100g Preparation Example 1 is placed in the kettle, and 2.0g mercaptoacetic acid is added , 0.2gL-ascorbic acid, then began to drop a mixture of 15g acrylic acid and 0.1g tert-butyl peroxybenzoate, the time for the dropwise addition was 2h, after the completion of the dropwise aging for 1h, after cooling to room temperature, it was ground into solid particles . The product is characterized by infrared spectroscopy, in its infrared spectrum, 3440.79cm -1 It is the stretching vibration of O-H, 2871.40cm -1 and 2873.53cm -1 The strong absorption peak is -CH 2 The stretching vibration of - and -CH 3 Bending vibration; 1705.89cm -1 It is the stretching vibration of C=O, 1105.58cm -1 and 1259.99cm -1 The very strong absorption peak at is -C-O-C-stretching vibration; the infrared results show that the solid water reducer is successfully synthesized....

Embodiment 2

[0070] 100g of the liquid unsaturated polyether macromer (molecular weight is 2400) prepared with 3-methyl-3-buten-1-ol as a starter in Preparation Example 1 was placed in the kettle, and 0.05g of mercaptoacetic acid was added , 1.0gL-ascorbic acid, and then began to drop a mixture of 2.5g acrylic acid and 1g tert-butyl peroxybenzoate for 2 hours. After the addition was completed, it was matured for 1 hour. After cooling to room temperature, it was ground into solid particles . The product is characterized by infrared spectroscopy, in its infrared spectrum, 3440.85cm -1 It is the stretching vibration of O-H, 2871.45cm -1 and 2873.60cm -1 The strong absorption peak is -CH 2 The stretching vibration of - and -CH 3 Bending vibration; 1705.5cm -1 It is the stretching vibration of C=O, 1260.15cm -1 The very strong absorption peak at is -C-O-C-stretching vibration; the infrared results show that the solid water reducer is successfully synthesized.

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Abstract

The invention relates to the technical field of concrete additives, in particular to a solid polycarboxylate superplasticizer as well as a preparation method and application thereof. According to thepreparation method, an unsaturated carboxylic acid and a liquid polyether monomer are subjected to direct free radical polymerization reactions in a solvent-free environment, and then the solid polycarboxylate superplasticizer which is excellent in property is prepared. By adopting the preparation method, a body polymerization mode is implemented, no solvent or medium is used in the whole process,and a common method that water or an organic solvent is added at an early stage and is removed at a later stage is effectively improved; the obtained solid polycarboxylate superplasticizer not only is convenient to transport, but also has properties superior to those of solid polycarboxylate superplasticizers in the market.

Description

technical field [0001] The invention relates to the technical field of concrete admixtures, in particular to a solid polycarboxylate water reducer and its preparation method and application. Background technique [0002] As the fifth component of modern concrete, polycarboxylate superplasticizer has been widely used in the field of concrete engineering technology due to its excellent advantages such as low dosage, high slump retention, and large degree of freedom in molecular design. Most of the polycarboxylate superplasticizers widely used at present are solution products with a concentration of 10-50%, which causes great cost problems for long-distance transportation. In dry powder mortar, the liquid water reducer product needs to be spray-dried before use, but the spray-drying process consumes a lot of energy, and the overall performance of the product after spray-drying decreases, which cannot reach the level of liquid polycarboxylate in practical applications. The perf...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08F283/06C08F220/06C08F222/06C04B24/26C04B103/30
CPCC04B24/2605C04B2103/302C08F283/065C08F220/06C08F222/06
Inventor 张文龙朱军成郭晓锋李华威李方
Owner 联泓(江苏)新材料研究院有限公司
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