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Preparation method of cardanol-base polyalcohols and polyurethanes thereof

A cardanol-based and cardanol-based technology, which is applied in the preparation of two cardanol-based polyols and polyurethanes, can solve the problems of lack of hardness, coating wear resistance and poor chemical resistance, and achieve rich sources and excellent flexibility Good effect of sex and hardness

Active Publication Date: 2014-10-08
JIANGXI SCI & TECH NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Vegetable oil-based polyols have been widely used in the preparation of polyurethane resins. However, since most vegetable oils are triglyceride structures of fatty acids, the polyurethane resins prepared from polyols lack hardness and are used as coatings. Resin leads to poor wear resistance and chemical resistance of the coating

Method used

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  • Preparation method of cardanol-base polyalcohols and polyurethanes thereof
  • Preparation method of cardanol-base polyalcohols and polyurethanes thereof
  • Preparation method of cardanol-base polyalcohols and polyurethanes thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0024] In a 100ml round bottom flask, add 20g cardanol, 23.5g 2-mercaptoethanol, 0.87g 2-hydroxy-2-methyl-1-phenyl-1-acetone and 50ml dichloromethane. Reaction for 10 hours under light irradiation, wash with water 5-6 times and then use anhydrous MgSO 4 After drying, the cardanol-based polyol is removed from the solvent, and the number of hydroxyl groups is 2 by nuclear magnetic measurement.

Embodiment 2

[0026] In a 100ml round bottom flask, add 20g cardanol, 23.5g 2-mercaptoethanol, 0.87g 2-hydroxy-2-methyl-1-phenyl-1-acetone and 50ml dichloromethane. React for 20 hours under light irradiation, wash with water 5-6 times and use anhydrous MgSO 4 After drying, the cardanol-based polyol is removed from the solvent, and the number of hydroxyl groups is 2.5 by nuclear magnetic field measurement.

Embodiment 3

[0028] In a 100ml round bottom flask, add 20g cardanol, 23.5g 2-mercaptoethanol, 0.87g 2-hydroxy-2-methyl-1-phenyl-1-acetone and 50ml dichloromethane. React under light irradiation for 45 hours, wash with water 5-6 times and use anhydrous MgSO 4 After drying and removing the solvent, a cardanol-based polyol was obtained, and the number of hydroxyl groups was 3.3 by nuclear magnetic measurement.

[0029] Cardanol 1 HNMR chart see figure 1 , Cardanol polyol (3.3 hydroxyl groups) 1 HNMR chart see figure 2 .

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Abstract

The invention discloses a preparation method of two cardanol-base polyalcohols and polyurethanes thereof, which comprises the following steps: (1) directly carrying out sulfhydryl-alkene addition reaction on cardanol side chain unsaturated double bond and sulfhydryl monoalcohol under the irradiation of ultraviolet light to prepare the side chain cardanol-base polyalcohol with controllable hydroxyl number; (2) reacting hendecene acyl chloride and phenolic hydroxyl group of cardanol to prepare 10-undecylenic acid modified cardanol, reacting with sulfhydryl monoalcohol to prepare 10-undecylenic acid modified cardanol-base polyalcohol with controllable hydroxyl number; and (3) reacting the cardanol-base polyalcohol and 10-undecylenic acid modified cardanol-base polyalcohol with diisocyanate to prepare the cardanol-base polyurethanes. The method has the advantages of low cost, no environmental pollution and the like, and is renewable and biodegradable; and the generated polyurethane resin can be used as a resin for paints and adhesives.

Description

Technical field [0001] The invention relates to a preparation method of bio-based polyurethane, in particular to a preparation method of two cardanol-based polyols and their polyurethanes. Background technique [0002] Cardanol is a rich and cheap renewable non-edible vegetable oil resource. Its molecular structure contains phenolic hydroxyl groups and 15-carbon side chains with different degrees of unsaturation. This unique molecular structure is conducive to its chemical modification to prepare different functional chemicals and polymer materials. Among them, cardanol-based surfactants and cardanol-containing anticorrosive coatings have been studied. The reaction points of chemical modification are mainly concentrated on the phenolic hydroxyl group, and the unsaturated double bond on its side chain is less modified, and only a small amount of research on the epoxidation of the unsaturated side chain is carried out. Vegetable oil-based polyols have been widely used in the prepa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/67C08G18/32C07C319/16C07C323/16
CPCC07C319/18C08G18/677C07C323/16
Inventor 付长清申亮刘建成
Owner JIANGXI SCI & TECH NORMAL UNIV
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