Polyurethane elastomer with lateral chain containing fluoroalkyl and preparation method thereof

A polyurethane elastomer, fluorine-containing alkyl technology, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve the problems of short molecular chain length of side chain fluorine group, limited industrial application, non-adjustment, etc., to achieve excellent resistance. The effect of chemical corrosion, excellent mechanical properties, extremely low surface energy

Inactive Publication Date: 2010-07-14
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Among them, although PU resin, which is widely used as a coating material, has high strength, high elasticity, high wear resistance, excellent low temperature performance and bonding performance, there are still some problems: such as poor acid and alkali resistance and heat resistance, etc. thus limiting its further application
However, due to the short molecular chain length of the side chain fluorine group produced by this method, and it cannot be adjusted, it is difficult for the fluorine group in the side chain to effectively protect the polyurethane structure, so that the adjustability of FPU performance is greatly reduced.
In addition, the fluorine-containing polyether polyol is obtained by reacting highly toxic gas-phase fluorine-containing monomer and liquid-phase polyether under harsh process conditions (high pressure reaction, etc.), which limits its industrial application [Ge Z, Zhang XY, Dai JB.Synthesis and characterization of a new fluorinatedpolyether glycol prepared by radical grafting of hexafluoropropylene ontopolytetramethylene glycol.Eur Polym J, 2006, 42, 395-401]

Method used

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  • Polyurethane elastomer with lateral chain containing fluoroalkyl and preparation method thereof
  • Polyurethane elastomer with lateral chain containing fluoroalkyl and preparation method thereof
  • Polyurethane elastomer with lateral chain containing fluoroalkyl and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] (1) Add tetrafluoropropanol, epichlorohydrin and sodium hydroxide sequentially according to the molar ratio of 1:1:10, then add 50mL of 1,4-dioxane to it, stir under nitrogen protection, and The reaction was carried out at constant temperature at 50°C for 3h. After the reaction was over, the solution was poured off. Distill under reduced pressure at a vacuum degree of 1 mmHg to obtain a fluoroalkyl-substituted propylene oxide compound monomer.

[0051] (2) Add tetrahydrofuran, ethylene glycol, and boron trifluoride ether into the flask in sequence according to the molar ratio of 1:0.1:0.001, and then add 100 mL of dichloromethane into it, and stir. Then, 0.4 mol of the fluoroalkyl-substituted propylene oxide compound obtained in step (1) was added dropwise thereto, and reacted at 20° C. for 3 h. After the reaction is over, add water equivalent to 50 times the volume of the raw material for washing. After static separation, the oil phase was distilled under reduced pr...

Embodiment 2

[0055] In step (3), change 2mol of diphenylmethane diisocyanate into 4mol of 1,6-hexamethylene diisocyanate (HDI), change 30mL of acetone into 300mL of ethyl acetate, and other steps are the same as in Example 1.

[0056] The contact angle of the polyurethane elastomer containing fluoroalkyl groups in the side chain to water is 63°, the tensile strength is 16.5MPa, and the glass transition temperature is 167°C.

Embodiment 3

[0058] In step (3), change 2mol of diphenylmethane diisocyanate into 6mol of toluene diisocyanate, change 30mL of acetone into 20mL of butanone, and other steps are the same as in Example 1.

[0059] The contact angle of the polyurethane elastomer containing fluoroalkyl groups in the side chain to water is 65°, the tensile strength is 15.5MPa, and the glass transition temperature is 157°C.

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Abstract

The invention discloses a polyurethane elastomer with a lateral chain containing fluoroalkyl and a preparation method thereof. The method comprises the following steps: (1) adding RFOH, halogenated oxygen heterocyclic ring compound, catalyst and polar solvent according to a ratio, reacting under the protection of nitrogen and stirring, reducing pressure and distilling to obtain the monomer of fluoroalkyl-substituted oxygen heterocyclic ring compound; (2) adding solvent, cyclic ether compound, initiator and catalyst according to a ratio, dropwise adding the monomer of fluoroalkyl-substituted oxygen heterocyclic ring compound, reacting under the protection of nitrogen and stirring, washing, standing for layering followed by reducing pressure and distilling to obtain polyether polyalcohol resin with a lateral chain containing fluoroalkyl; and (3) taking the polyether polyalcohol resin with the lateral chain containing fluoroalkyl, diisocyanate and catalyst according to a ratio, reacting under the protection of nitrogen to obtain a prepolymer, rapidly pouring the prepolymer into a preheating mould for curing after chain extension reaction and degassing to obtain the polyurethane elastomer with the lateral chain containing fluoroalkyl. The invention can be used for manufacturing high performance coating and elastomer.

Description

technical field [0001] The invention belongs to the technical field of macromolecule materials, and in particular relates to a polyurethane elastomer with a side chain containing a fluoroalkyl group and a preparation method thereof. Background technique [0002] In recent years, organic resins for high-performance coatings such as polyurethane (PU) and fluorocarbon FEVE resins have developed rapidly. Among them, although PU resin, which is widely used as a coating material, has high strength, high elasticity, high wear resistance, excellent low temperature performance and bonding performance, there are still some problems: such as poor acid and alkali resistance and heat resistance, etc. Thus limiting its further application. Fluorocarbon FEVE resins can be used as high-grade coatings because of their high protective effect, but there are still disadvantages such as poor adhesion, poor solubility, low solid content and high cost. [0003] In order to overcome the above sho...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/50C08G18/10C08G65/26C08G65/28C09D175/08
Inventor 张英强贾润萍黄茂松徐家跃
Owner SHANGHAI INST OF TECH
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