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Photosensitive type TPU film and preparation method thereof

A photosensitive film technology, applied in the field of photosensitive TPU film and its preparation, can solve the problems of poor controllability of polymerization degree, difficult application, high uncontrollability of polyurethane, and achieve good physical properties, enhanced photosensitivity, and good controllability sexual effect

Inactive Publication Date: 2017-06-13
DONGGUAN XIONGLIN NEW MATERIAL TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the present invention introduces photosensitive groups into the main chain of polyurethane, which is beneficial to the preparation of polyurethane films, it is difficult to control the photosensitive degree by changing the degree of polymerization and the ratio of polymerized monomers in combination with the main chain. Poor controllability, resulting in high uncontrollability of the polyurethane, difficult to apply
[0006] At the same time, the photosensitive TPU film in the prior art, especially the photochromic photosensitive TPU film, mainly changes the color change property of the film by changing the type of doped photosensitizer, and the color development is limited by the photosensitizer, so that the color changes Less variety and poor controllability

Method used

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  • Photosensitive type TPU film and preparation method thereof
  • Photosensitive type TPU film and preparation method thereof
  • Photosensitive type TPU film and preparation method thereof

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preparation example Construction

[0047] The specific embodiment part of the present invention also provides a kind of preparation method of described photosensitive TPU thin film, it is characterized in that, described preparation method comprises the following steps:

[0048] (1) Add the polyether polyol and 4,4'-diphenylmethane diisocyanate of the formula into the container in sequence, and vacuumize at 50-60°C under stirring conditions to obtain the prepolymer;

[0049] (2) Adding a chain extender and a catalyst in a formulated amount to the prepolymer obtained in step (1), and continuing to react for 2 to 4 hours at 70 to 80° C.;

[0050] (3) Add formula amount of 5-nitrospirooxazine to the reacted material in step (2), stir for 1-2 hours, then add into twin-screw extruder and extrude to obtain photosensitive TPU film.

[0051] In order to facilitate understanding of the present invention, the present invention enumerates the following examples. It should be clear to those skilled in the art that the emb...

Embodiment 1

[0053] A kind of preparation method of photosensitive TPU film, described method comprises the following steps:

[0054] (1) Add 70 parts of polyether polyol (number average molecular weight 3500) and 30 parts of 4,4'-diphenylmethane diisocyanate into the container in sequence, stir at a speed of 500r / min, and vacuumize at 50°C to -0.4kPa, get the prepolymer;

[0055] (2) Add 10 parts of chain extender and 1 part of catalyst in the formula amount to the prepolymer obtained in step (1), and continue to react at 70° C. for 2 hours;

[0056] (3) Add 15 parts of 5-nitrospirooxazine to the reacted material in step (2), stir for 1h at a speed of 500r / min, then join in the twin-screw extruder, set the twin-screw extruder The temperature of the feeding section of the machine is 130°C, the temperature of the mixing section is 150°C, the temperature of the extrusion section is 170°C, and the temperature of the head section is 170°C, and the photosensitive TPU film is obtained by extrus...

Embodiment 2

[0058] A kind of preparation method of photosensitive TPU film, described method comprises the following steps:

[0059] (1) Add 86 parts of polyether polyol (number average molecular weight 3200) and 42 parts of 4,4'-diphenylmethane diisocyanate into the container in sequence, stir at a speed of 1000r / min, and vacuumize at 58°C to -0.35kPa, obtain prepolymer;

[0060] (2) Add 14 parts of chain extender and 2 parts of catalyst in the formula amount to the prepolymer obtained in step (1), and continue to react at 78°C for 3.5h;

[0061] (3) Add 12 parts of 5-nitrospirooxazine to the reacted material in step (2), stir for 1.8h at a speed of 1000r / min, then join in the twin-screw extruder, set the twin-screw extruder The temperature of the feeding section of the machine is 138°C, the temperature of the mixing section is 158°C, the temperature of the extrusion section is 178°C, and the temperature of the head section is 178°C, and the photosensitive TPU film is obtained by extrus...

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Abstract

The present invention relates to a photosensitive type TPU film, and the photosensitive type TPU film is prepared from 4,4 '-diphenylmethane diisocyanate, a polyether polyol, a chain extender, 5-nitro spirooxazine and a catalyst, and the mass ratio of 4,4 '-diphenylmethane diisocyanate to 5-nitro spirooxazine is (2-9): 1. Through synergistic effect of the 4,4 '-diphenylmethane diisocyanate and the 5-nitro spirooxazine, color shown after illumination of the photosensitive type TPU film can be regulated by controlling of the mass ratio of the 4,4 '-diphenylmethane diisocyanateand the 5-nitro spirooxazine due to different electron cloud density of benzene rings contained in the 4,4 '-diphenylmethane diisocyanateand the 5-nitro spirooxazine. Test results show that the tensile strength of the photosensitive type TPU film is 88MPa, the elongation at break is 719%, the rebound rate is 91%, and the photosensitive type TPU film has good physical properties. Meanwhile, the preparation process of the photosensitive type TPU film is simple and can be used for industrial production.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and relates to a photosensitive TPU film and a preparation method thereof. Background technique [0002] Thermoplastic polyurethane (TPU) is a new type of organic polymer synthetic material with excellent properties and can replace rubber and soft polyvinyl chloride material PVC. TPU has excellent physical properties, such as wear resistance and resilience, which are better than ordinary polyurethane and PVC, and aging resistance is better than rubber. It can be said to be the most ideal material to replace PVC and PU. [0003] Photochromic articles, especially photochromic plastic materials for optical applications, have been the subject of intense interest. In particular, photochromic ophthalmic plexiglass lenses have gained commercial favor due to their weight advantages and impact resistance compared to ordinary glass lenses. In addition, photochromic transparent sheets, eg, photo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08G18/76C08G18/66C08G18/48C08G18/32C08G18/12C08K5/357B29C47/92B29C48/92
CPCC08G18/7671B29C48/92B29C2948/92704C08G18/12C08G18/3206C08G18/48C08G18/6674C08J5/18C08J2375/08C08K5/357
Inventor 何建雄王一良杨博
Owner DONGGUAN XIONGLIN NEW MATERIAL TECH