O-maleoyl lactylate compound, its preparation method and its application in the synthesis of polycarboxylate superplasticizer

An acyl lactylate and compound technology, applied to O-maleyl lactate compound and its preparation and application in the synthesis of polycarboxylate water reducer, can solve the problem of poor initial dispersibility, cumbersome process, excessive cement Compatibility of retarded cement and retarder, etc., to achieve the effects of increased concrete slump, cheap and easy-to-obtain synthetic raw materials, and good initial dispersibility

Active Publication Date: 2016-11-23
SICHUAN TONGZHOU CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the mixed mixing of retarders may cause problems such as excessive retardation of cement, compatibility of cement and retarders, etc., thus affecting the construction progress of concrete and the quality of concrete
The operation process of post-blending method and multi-blending method is complicated, requires high equipment, high economic cost, and little practical value
[0004] Patents US5911820, US51622402 and CN101041571 etc. disclose the method of using acrylate or maleate as a small molecular monomer to prepare slow-release slump-preserving polycarboxylate water-reducer, but there are poor initial dispersibility, difficult dissolution and complicated process or high cost issues
At present, the types of slow-release small molecular monomers are limited, mainly ester monomers such as acrylate and hydroxyethyl acrylate, and the production and application of domestic polycarboxylate superplasticizers have been extensive. Polycarboxylate superplasticizers However, the modification work has always been limited by the main raw material - the active macromonomer, so most of the modification synthesis can only start with the small monomer that initiates the copolymerization
The introduction of small ester monomers into the molecular structure of polycarboxylate superplasticizers can effectively improve the slump retention capacity of concrete, but it will reduce the initial dispersion performance of the superplasticizer, especially the monoester small monomers.

Method used

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  • O-maleoyl lactylate compound, its preparation method and its application in the synthesis of polycarboxylate superplasticizer
  • O-maleoyl lactylate compound, its preparation method and its application in the synthesis of polycarboxylate superplasticizer
  • O-maleoyl lactylate compound, its preparation method and its application in the synthesis of polycarboxylate superplasticizer

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Experimental program
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Embodiment 1

[0047] Weigh methyl lactate (104 g, 1 mol) and maleic anhydride (98 g, 1 mol) respectively, place them in a reaction kettle, add 1 g of p-toluenesulfonic acid, and stir well. Under the protection of nitrogen, the reaction system was slowly heated to 80° C. and stirred for 2-4 h until the reaction was complete (the reaction can be monitored by GC or TLC). After cooling, the light yellow solid product O-methyl maleyl lactylate (1) is obtained, which can be directly used in the synthesis of polycarboxylate water reducer mother liquor without separation and purification.

Embodiment 2

[0049] Add methyl lactate (104 g, 1 mol) and maleic anhydride (98 g, 1 mol) into chloroform (500 mL) respectively, stir and dissolve at room temperature, and then add 1 g of p-toluenesulfonic acid. Under the protection of nitrogen, the reaction system is slowly heated to reflux, and the reaction progress can be monitored by GC or TLC, etc., and the reflux reaction is kept for 2-4 hours until the reaction is complete. After cooling, the solvent was distilled off to obtain the light yellow solid product O-methyl maleyl lactylate (1), which can be used for the synthesis of polycarboxylate water reducer mother liquor without separation and purification. ESI-MS(m / z):[M-H] - 201.1.

Embodiment 3

[0051] Ethyl lactate (118g, 1mol) and maleic anhydride (98g, 1mol) were weighed separately, placed in a reaction kettle, 1g of p-toluenesulfonic acid was added, and stirred evenly. Under the protection of nitrogen, the reaction system was slowly heated to 80° C. and stirred for 2-4 h until the reaction was complete (the reaction can be monitored by GC or TLC). After cooling, the light yellow solid product O-ethyl maleyl lactate (2) can be obtained, which can be directly used in the synthesis of polycarboxylate superplasticizer mother liquor without separation and purification. ESI-MS(m / z):[M-H] - 215.1.

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Abstract

The invention discloses an O-maleoyl lactate compound represented by formula (I), and a preparation method thereof. The preparation method of the compound comprises the following steps: taking maleic anhydride and lactate according to a molar ratio of 1:0.5-3, adding maleic anhydride and lactate into a reactor, stirring for reacting for 2-4h under the protection of nitrogen at 50-95DEG C for 2-4h, and cooling after the above reaction is completed to prepare a crude product of the O-maleoyl lactate compound. The O-maleoyl lactate compound is used for synthesizing polycarboxylic superplasticizers, and polycarboxylic superplasticizers synthesized in the invention have the advantages of good initial dispersibility, good slump retaining property, simple process and strong practicality.

Description

technical field [0001] The invention belongs to organic compounds and their preparation and application in building materials, and relate to O-maleyl lactylate compound, its preparation method and its application in the synthesis of polycarboxylate water reducer. Especially for. The O-maleoyl lactate of the present invention is used as a double ester-based slow-release small molecular monomer for the synthesis of polycarboxylate superplasticizers, and the synthesized polycarboxylate superplasticizers have good initial dispersibility (That is, higher water reduction rate) and good slump retention performance. Background technique [0002] As the main building material, concrete has played an increasingly important role in national construction and development. As a key component of concrete admixture, water reducing agent can reduce the water consumption per unit volume of concrete, improve the working performance of ready-mixed concrete, improve the strength and service li...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07C69/67C07C67/08C08F283/06C08F220/06C08F222/14C04B24/32C04B103/30
CPCC04B24/32C07C67/08C07C69/67C08F283/065C04B2103/302C04B2103/0067C08F220/06C08F222/14
Inventor 舒豆豆杨海君鲜芳燕马春成吴峰何年梁青松韦伟
Owner SICHUAN TONGZHOU CHEM TECH
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