A kind of hydrophobic membrane based on fluorine-containing polyurethane and its preparation method

A polyurethane and hydrophobic film technology, applied in the field of polyurethane materials, can solve the problems of insufficient weather resistance and water resistance, reduced mechanical properties of polyurethane products, and failure to reach modified polyurethane, etc., and achieves good water repellency, easy curing, and easy stored effect

Active Publication Date: 2020-04-03
SUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the traditional polyurethane materials have insufficient weather resistance and water resistance. Since these polyurethanes use diisocyanates containing aromatic ring structures as the reactant, the products often turn yellow and produce macromolecules when they are exposed to ultraviolet light for a long time outdoors. degradation
When fluorine-containing polyurethane is prepared by addition and chain extension of small-molecule fluorine-containing diols and diisocyanates, the weather resistance of the product can be improved, but the use of small-molecule diols reduces the mechanical properties of polyurethane products, reduces the The amount of alcohol can not achieve the purpose of modifying polyurethane

Method used

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  • A kind of hydrophobic membrane based on fluorine-containing polyurethane and its preparation method
  • A kind of hydrophobic membrane based on fluorine-containing polyurethane and its preparation method
  • A kind of hydrophobic membrane based on fluorine-containing polyurethane and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Synthesis of nonafluorooxetane monomer

[0034] In a 1000mL three-necked flask equipped with a thermometer, ice-water bath and magnetic stirrer protection, add 16.1g of butyl acetate, 26.2g of sodium bicarbonate, 55.8g of sodium dithionite, 227g of N,N-dimethylformamide, 202g of water, 55.3g of perfluorobutyl iodide was added dropwise, reacted at -13°C for 3h, slowly raised to room temperature, and kept for 2h. After the reaction was completed, extraction was performed three times with 180 g of toluene. The extracts were combined, washed 3 times with water to obtain a solution of 4-nonafluorobutyl-3-iodobutyl acetate, which was added to a 1000mL three-necked flask, and 310g of sodium hydroxide solution with a mass concentration of 20% was added dropwise and kept at React at 12°C for 3h. After the reaction, the layers were separated. The organic layer was washed three times with water, dried and distilled under reduced pressure to obtain 32.6 g of 3-(1H,1H-nonaflu...

Embodiment 2

[0042] (1) Synthesis of nonafluorooxetane monomer

[0043] In a 1000mL three-necked flask equipped with a thermometer, ice-water bath and magnetic stirrer protection, add 16.5g of butyl acetate, 26.4g of sodium bicarbonate, 53.6g of sodium dithionite, 230g of N,N-dimethylformamide, 210g of water was added dropwise with 55.5g of perfluorobutyl iodide, reacted at -15°C for 3h, slowly raised to room temperature, and kept for 2h. After the reaction was completed, extraction was performed three times with 180 g of toluene. The extracts were combined, washed 3 times with water to obtain a solution of 4-nonafluorobutyl-3-iodobutyl acetate, which was added to a 1000mL three-necked flask, and 310g of sodium hydroxide solution with a mass concentration of 20% was added dropwise and kept at React at 11°C for 3h. After the reaction, the layers were separated. The organic layer was washed three times with water, dried and distilled under reduced pressure to obtain 34.2 g of 3-(1H,1H-non...

Embodiment 3

[0052] (1) Synthesis of tridecafluorooxetane monomer

[0053] In a 1000mL three-necked flask equipped with a thermometer, ice-water bath and magnetic stirrer protection, add 16.5g of butyl acetate, 28.2g of sodium bicarbonate, 55.5g of sodium dithionite, 221g of N,N-dimethylformamide, 230g of water, 73.0g of perfluorohexyl iodide was added dropwise, and the addition was completed in 50 minutes. After the addition, it was reacted at -12°C for 6 hours, slowly raised to room temperature, and kept for 3 hours. After the reaction was finished, extract with 180g trifluorotoluene in 3 times. The extracts were combined and washed 3 times to obtain a 4-tridecafluorohexyl-3-iodobutyl acetate solution. The solution was directly added to a 1000mL three-necked flask, and 550g of mass concentration was added dropwise to a 10% sodium hydroxide solution. Insulate and react at 13°C for 8h. After the reaction, the layers were separated. The organic layer was washed three times with water, dr...

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Abstract

The invention discloses a hydrophobic film based on fluorine-containing polyurethane and a preparation method thereof; the fluorine-containing polyurethane is spin-coated to form a film, and the hydrophobic film based on fluorine-containing polyurethane is obtained after curing; Addition polymerization of isocyanate, catalyzed by tin catalyst, extended by chain extender, and capped with aminosilane coupling agent to obtain fluorine-containing polyurethane; the product has a fluorine-containing polyether block with high fluorine content, located in the polyether The fluoroalkyl group of the side group is prone to microphase separation and surface migration, and the surface energy of the polyurethane is low. The fluorine-containing polyurethane is terminated with a silane coupling agent, which is easy to store and cure. The hydrophobic membrane based on fluorine-containing polyurethane disclosed by the invention has a water contact angle higher than 110° and excellent water repellency.

Description

technical field [0001] The invention relates to a polyurethane material, in particular to a hydrophobic membrane based on fluorine-containing polyurethane and a preparation method thereof, belonging to the field of polyurethane and fine chemicals. Background technique [0002] Polyurethane is a block-type polymer formed by the addition polymerization of polyether and diisocyanate, which is formed by the addition and polymerization of soft segments and hard segments. Its unique molecular structure and aggregated structure make polyurethane have excellent mechanical properties such as toughness and strength. And has superior oil resistance, wear resistance and other properties. Because of this, polyurethane has become one of the most widely used polymer materials today. However, the traditional polyurethane materials have insufficient weather resistance and water resistance. Since these polyurethanes use diisocyanates containing aromatic ring structures as the reactant, the p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08J5/18C08G18/66C08G18/50C08G18/32C08G18/28C08G65/22C09D175/08C09D5/16C08L75/08
CPCC08G18/289C08G18/3206C08G18/5015C08G18/6674C08G65/226C08J5/18C08J2375/08C09D5/1662C09D175/08
Inventor 李战雄陈蕾刘群
Owner SUZHOU UNIV
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