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Transparent polyurethane material and preparation method thereof

A technology of polyurethane material and polyurethane film, which is applied in the field of transparent polyurethane material and its preparation, to achieve the effects of reducing cost, improving utilization rate and reducing dependence

Inactive Publication Date: 2015-09-09
CHANGCHUN UNIV OF TECH +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002]Polyurethane (PU) has excellent performance and many kinds of products. The material has low optical transparency and poor heat resistance, which limits the application in some aspects. With the continuous expansion of applications in automobiles, transparent devices, aerospace, medical equipment, safety protection, etc., transparent polyurethane More and more attention has been paid to the study of materials, and transparent polyurethane has become a new research direction for the development of polyurethane in recent years. US patents US693993982, US0017268A1, US7216976B2, US0000656Al, US0281965AI, US2008017119 and Chinese patents 201210374773.7, 201210072896.5, 201210072896.5, 20121033 transparent polyurethane Synthesis and performance research of resin materials [J]. Journal of Huazhong University of Science and Technology (Natural Science Edition), 2004, 32(7): 98-101), Chao Youming (. Preparation of single-component fast-drying polyurethane transparent film materials. Taiyuan Journal of University of Science and Technology, 2007,38(4):324-327), Wang Hua (Preparation and Research of Transparent Polyurethane Material (D), Xi'an University of Science and Technology. 2007.04.20), Zhang Xiaohua, etc. (Synthesis of High Performance Transparent Polyurethane Elastomer Research [J]. Plastic Industry. 2002,30(6):8-11), Xue Shue et al. Polyurethane film molding and application research [J]. Engineering Plastics Application. 2002,30(3):35-37), all prepared and researched transparent polyurethane, but these transparent polyurethanes are based on polyether polyol or poly It is prepared by the reaction of ester polyol and isocyanate. The prepared transparent polyurethane material can be used as an application material that does not require high transparency and a substitute for ordinary optical glass. Spectacle lenses, safety glass, protective glasses and other optical devices

Method used

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  • Transparent polyurethane material and preparation method thereof
  • Transparent polyurethane material and preparation method thereof

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] The preparation method of polyurethane according to this embodiment comprises the following steps: adding 900 mL of ethyl acetate into the reaction kettle, vacuumizing the reaction system, adding 30 g of xylose and 90.06 g of isophorone diisocyanate under nitrogen protection , stirred at room temperature and reacted for 30 minutes, then added 0.032 g of dibutyltin dilaurate as a catalyst to the reaction system that continued to stir, heated the oil bath to 50 ° C, reacted for 3.0 h, and detected the concentration of -NCO in the solution by the di-n-butylamine method. content, when the content of -NCO reaches 15~18%, add 20.12g of chain extender 1,4-butanediol to the reaction kettle, continue to react for 30min, and remove the ethyl acetate solvent under reduced pressure to obtain a transparent viscous solution , spread the transparent viscous solution into a film by the casting method, and cure it at room temperature for 7 hours to obtain a transparent polyurethane film ...

Embodiment 2

[0014] The preparation method of polyurethane according to this embodiment comprises the following steps: adding 1280 mL of tetrahydrofuran into the reaction kettle, vacuumizing the reaction system, adding 30 g of xylose and 148.6 g of hexamethylene diisocyanate under the protection of nitrogen, and Stir and react at room temperature for 60 minutes, then add 0.048 g of catalyst stannous octoate to the reaction system that continues to stir, heat the oil bath to 70 ° C, and react for 2.5 hours. The content of -NCO in the solution is detected by the di-n-butylamine method. When - When the content of NCO reaches 15~18%, add 29.12g of chain extender 1,6-hexanediol into the reaction kettle, continue to react for 15min, and remove the THF solvent under reduced pressure to obtain a transparent viscous solution, which is dissolved by the flow-through method. The transparent viscous solution is deposited and cured at room temperature for 10 hours to obtain a transparent polyurethane fil...

Embodiment 3

[0016] The preparation method of polyurethane according to this embodiment comprises the following steps: adding 990 mL of acetone into the reaction kettle, vacuumizing the reaction system, adding 30 g of xylose and 4,4-dicyclohexylmethane diisocyanate under nitrogen protection 110.35g, stirred at room temperature and reacted for 40min, then added 0.035g of catalyst dibutyltin dilaurate to the reaction system that continued to stir, heated the oil bath to 80°C, reacted for 1h, and detected -NCO in the solution by the di-n-butylamine method When the content of -NCO reaches 15~18%, add 15.10g of chain extender 1,2-propanediol to the reaction kettle, continue to react for 45min, remove the acetone solvent under reduced pressure to obtain a transparent viscous solution, pass Spread the transparent viscous solution into a film by flow method, and cure it at room temperature for 6 hours to obtain a transparent polyurethane film material.

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Abstract

Belonging to the field of polyurethane high polymer materials, the invention relates to a transparent polyurethane material and a preparation method. The transparent polyurethane material takes acetone as the solvent, adopts ethylene glycol as the chain extender, and uses stannous octoate as the catalyst, and is prepared by polymerization of xylose and aliphatic isocyanate. The preparation method includes: (by mass), taking 900-1300 parts of tetrahydrofuran as the reaction solvent, reacting 20-50 parts of xylose (with a moisture content of less than 0.003%) with 80-150 parts of diisocyanate under the action of the catalyst and chain extender to obtain a polyurethane solution, subjecting the solution to film casting on a polyfluortetraethylene plate to obtain a film, and conducting curing at room temperature for 6-10h, thus obtaining the transparent polyurethane material. The synthesized polyurethane material has acid resistance, alkali resistance, light transmission, good oil resistance and mechanical properties, can be used as outer coatings for automobile front and rear lamp shades, safety glass, instruments and equipment, and daily use articles, and plays the role of dustproofness, oil pollution resistance, corrosion prevention and other surface protection.

Description

technical field [0001] The invention belongs to polyurethane polymer materials, in particular to a transparent polyurethane material and a preparation method thereof. Background technique [0002] Polyurethane (PU) has excellent performance and a wide variety of products. It is widely used in automobiles, electrical appliances, construction, machinery, light industry, medical and aerospace and other fields. However, ordinary polyurethane materials have low optical transparency and poor heat resistance, which makes some The application in some aspects is limited to a certain extent. With the continuous expansion of applications in automobiles, transparent devices, aerospace, medical equipment, safety protection, etc., more and more attention has been paid to the research on transparent polyurethane materials at home and abroad. Transparent polyurethane has become a polyurethane in recent years. A new research direction of development, US patents US693993982, US0017268A1, US7...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/32C08J5/18C08L75/04
Inventor 杨江坤董添陈桂茹石富强米浩宇李桂娟
Owner CHANGCHUN UNIV OF TECH