A TPU film with an optical texture effect and its application in injection molded parts

Abstract

The present invention discloses a TPU film with an optical texture effect and its application in injection molded parts, including the following specific steps: (1) forming a TPU material layer on a PET release layer; (2) coating a photonic crystal material on the surface of the TPU material layer to form a layer of photonic crystal material layer; (3) cutting the TPU material layer coated with the photonic crystal material into sheets to obtain an optical TPU film sheet, and punching hanging nail holes at relative positions according to the specific size of the mold; (4) setting hanging nails on the injection mold and engraving different textures on the mold as needed; (5) hanging the optical TPU film sheet on the hanging nails and injecting an injection material layer; (6) taking out the semi-finished injection molded part after the injection molded part is formed; (7) trimming and packaging the finished product. The TPU film prepared by the present invention has an optical texture effect, can be injection molded with any material among TPU, nylon, PC, and nylon glass fiber mixture, meets the application of the TPU film on various injection molded parts, has a wide range of uses, and the optical effect of the TPU film never fades, is environmentally friendly, recyclable, and friendly to the environment.

Description

Technical Field

[0001] The present invention relates to the technical field of TPU preparation and application, and specifically to a TPU film with an optical texture effect and its application in injection molded parts. Background Art

[0002] TPU is called thermoplastic polyurethane elastomer rubber. It is mainly divided into polyester type and polyether type. It has a wide hardness range (60HA - 85HD), is wear-resistant, oil-resistant, transparent, and has good elasticity. It is widely used in daily necessities, sports goods, toys, decorative materials and other fields. Halogen-free flame-retardant TPU can also replace soft PVC to meet the environmental protection requirements of more and more fields. An elastomer refers to a polymer material with a glass transition temperature lower than room temperature, a fracture elongation rate > 50%, and good resilience after the external force is removed. Polyurethane elastomer is a special large category among elastomers. The hardness range of polyurethane elastomer is very wide and the performance range is very wide. Therefore, polyurethane elastomer is a kind of polymer material between rubber and plastic.

[0003] In the prior art, there are many problems in the preparation and application of TPU, such as occupying a large number of complex devices, having cumbersome processes and being unable to be managed in time during application, which affects the overall intelligent operation and management. At the same time, the TPU produced also has quality problems itself, resulting in frequent replacement, increasing the overall use cost and affecting the normal use requirements. Therefore, the present invention proposes a TPU film with an optical texture effect and its application in injection molded parts to solve the above-mentioned problems. Summary of the Invention

[0004] (1) Technical Problems to be Solved

[0005] In view of the deficiencies of the prior art, the present invention provides a TPU film with an optical texture effect and its application in injection molded parts, solving the many problems mentioned in the above background art, such as occupying a large number of complex devices, having cumbersome processes and being unable to be managed in time during application, which affects the overall intelligent operation and management. At the same time, the TPU produced also has quality problems itself, resulting in frequent replacement, increasing the overall use cost and affecting the normal use requirements.

[0006] (2) Technical Solutions

[0007] To achieve the above object, the present invention is realized through the following technical solutions: A TPU film with an optical texture effect, comprising:

[0008] A TPU material layer with a thickness of 0.1 - 0.2 mm;

[0009] A PET release layer provided at the bottom of the TPU material layer; the thickness of the PET release layer is 0.1 mm;

[0010] A photonic crystal material layer, disposed on top of the TPU material layer;

[0011] During application, tear off the PET release layer, and laminate an injection molding material layer on the bottom of the TPU material layer.

[0012] Preferably, the raw materials of the TPU material layer specifically include the following: polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoamer, and pigment mixture. The raw materials specifically include the following raw materials in parts by weight: 75 - 100 parts of polyurethane, 5 - 15 parts of stabilizer, 50 - 150 parts of organic solvent, 5 - 9 parts of lubricant, 3 - 30 parts of plasticizer, 1 - 10 parts of defoamer, and 5 - 15 parts of pigment mixture.

[0013] Preferably, the raw materials of the TPU material layer further include the following raw materials in parts by weight: 10 - 20 parts of bio - based material.

[0014] Preferably, the mixing mass ratio of the defoamer and the plasticizer is 1:3.

[0015] Preferably, the preparation method of the TPU material layer is as follows:

[0016] S1. Prepare the required raw materials in advance, and weigh the required amounts of polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoamer, and pigment mixture;

[0017] S2. Mix a part of the weighed raw materials. Add polyurethane, part of the organic solvent, and plasticizer to Preparation Tank 1 in sequence, and perform a first stirring treatment while stirring and a first temperature increase. Add stabilizer, the remaining organic solvent, plasticizer, lubricant, and pigment mixture to Preparation Tank 2, perform a second stirring treatment while stirring and a second temperature increase, mix the solutions inside Preparation Tank 2 and Preparation Tank 1, perform a third stirring treatment while stirring and a third temperature increase, and add the defoamer to obtain the raw material of the finished TPU film;

[0018] S3. Roll the obtained raw material of the finished TPU film into shape by a calender to obtain the TPU material layer.

[0019] Preferably, the stabilizer is one or a mixture of dimethyltriamine pentaacetic acid, cysteine - like substances, butyl hydroxybenzaldehyde, etc., and the lubricant is one or a mixture of polytetrafluoroethylene, lubricating grease, graphite powder, etc.

[0020] Preferably, the plasticizer is one or a mixture of dibutyl phthalate, dioctyl phthalate, triol - based phosphate, etc., and the pigment mixture is one or a mixture of rapeseed yellow, alizarin red, phthalocyanine blue, o - diaminobenzoate, etc.

[0021] Preferably, the first stirring in step S2 needs to be carried out at a rotation speed of 600 - 800 r / min for 10 - 30 min, and the first temperature rise is 100 - 175 °C; the second stirring in step S2 needs to be carried out at a rotation speed of 500 - 900 r / min for 10 - 20 min, and the second temperature rise is 120 - 220 °C; the third stirring in step S2 needs to be carried out at a rotation speed of 900 - 1500 r / min for 30 - 60 min, and the third temperature rise is 150 - 300 °C.

[0022] The application of the TPU film with optical texture effect in the production of injection molded parts includes the following specific steps:

[0023] (1) The TPU material layer is formed on the PET release layer, and the required texture is printed on the PET release layer. When the TPU material is formed on the PET release layer, a TPU material layer with a texture effect can be obtained;

[0024] (2) A photonic crystal material is coated on the surface of the TPU material layer to form a photonic crystal material layer;

[0025] (3) The TPU material layer coated with the photonic crystal material is cut into sheets to obtain an optical TPU film sheet. According to the specific size of the mold, the hanging nail holes in the relative positions are punched;

[0026] (4) Hanging nails are set on the injection mold, and different textures are engraved on the mold as needed;

[0027] (5) The optical TPU film sheet is hung on the hanging nails and an injection molding material layer is injection molded. The injection molding temperature is 150 - 220 °C;

[0028] (6) After the injection molded part is formed, the semi-finished injection molded part is taken out;

[0029] (7) Trim the edges and package the finished product.

[0030] Preferably, the raw materials of the injection molding material layer are TPU, nylon, PC, or a mixture of nylon and glass fiber. The variety of raw materials of the injection molding material layer can expand the application directions of the TPU film with optical texture effect and has strong practicability.

[0031] Preferably, after step (2) of coating the photonic crystal, the following operations are also required:

[0032] (201) Different texture effects are pressed on the surface of the coated photonic crystal material layer;

[0033] (202) Different patterns, characters, and colors are printed on the surface as needed. Water-based inks and bio-based inks can be used.

[0034] (3) Beneficial effects

[0035] The present invention provides a TPU film with an optical texture effect and its application in injection molded parts. Compared with the prior art, it has the following beneficial effects: The TPU film with an optical texture effect is made by combining a TPU material layer, a bottom PET release layer, a top photonic crystal material, and an elastic resin. The combination of the above materials improves the high elastic effect of the TPU film during actual use. It is environmentally friendly, renewable, has a hardness that meets the requirements, and has a good optical texture effect. When in use, prepare the required raw materials in advance, weigh the required weights of polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoaming agent, and pigment mixture, mix a part of the weighed raw materials, add polyurethane, a part of the organic solvent, and the plasticizer to the preparation tank 1 in sequence, perform a first stirring treatment synchronously, and perform a first temperature increase while stirring. Add the stabilizer, the remaining organic solvent, the plasticizer, the lubricant, and the pigment mixture to the preparation tank 2, perform a second stirring treatment synchronously, and perform a second temperature increase while stirring. Mix the solutions inside the preparation tank 2 and the preparation tank 1, perform a third stirring treatment synchronously, and perform a third temperature increase while stirring. Add the defoaming agent to obtain the finished TPU film raw material. Press the obtained finished TPU film raw material through a calender to form a shape, form the TPU material layer on the PET release layer, and obtain the TPU material layer. Coating the surface of the TPU material layer with a photonic crystal material to form a layer of photonic crystal material layer. Prepare the corresponding injection mold in advance according to the subsequent application requirements. Inject a layer of injection material layer on the surface of the TPU material layer coated with the photonic crystal material, which can simultaneously meet the production of injection molded parts. The TPU film prepared by the present invention has the effects of wear resistance, water wash resistance, environmental protection and no pollution. It is easy to process as a whole, improves work efficiency, and does not need post-treatment methods to make the surface of the injection molded parts present different texture patterns and optical effects, and is suitable for normal production and promotion.

[0036] In addition, the TPU film prepared by the present invention has an optical texture effect, can be injection molded with any material in TPU, nylon, PC, and nylon glass fiber mixture, meets the application of the TPU film on various injection molded parts, has a wide range of uses, and the optical effect of the TPU film never fades. It is environmentally friendly, recyclable, and friendly to the environment. Specific embodiments

[0037] Next, the technical solutions in the embodiments of the present invention will be described clearly and completely in conjunction with the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present invention.

[0038] A TPU film with an optical texture effect, comprising

[0039] TPU material layer;

[0040] PET release layer, disposed at the bottom of the TPU material layer;

[0041] Photonic crystal material layer, disposed on the top of the TPU material layer;

[0042] During application, tear off the PET release layer, and compound an injection molding material layer on the bottom of the TPU material layer. The material is set as TPU, nylon, PC, or nylon glass fiber mixture according to needs.

[0043] Furthermore, the raw materials of the TPU material layer specifically include the following: polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoaming agent, and pigment mixture. The raw materials specifically include the following raw materials in parts by weight: 75 - 100 parts of polyurethane, 5 - 15 parts of stabilizer, 50 - 150 parts of organic solvent, 5 - 9 parts of lubricant, 3 - 30 parts of plasticizer, 1 - 10 parts of defoaming agent, and 5 - 15 parts of pigment mixture.

[0044] Furthermore, the raw materials of the TPU material layer also include the following raw materials in parts by weight: 10 - 20 parts of bio - based material. The bio - based material is bio - BDO (1,4 - butanediol), which has the advantages of environmental protection and renewable raw materials. The organic solvent is DMF solvent.

[0045] Furthermore, the mixing mass ratio of the defoaming agent and the plasticizer is 1:3.

[0046] Furthermore, the preparation method of the TPU material layer is as follows:

[0047] S1. Prepare the required raw materials in advance, and weigh the required weights of polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoaming agent, and pigment mixture;

[0048] S2. Mix a part of the weighed raw materials. Add polyurethane, organic solvent, and plasticizer to Preparation Tank 1 in sequence, and conduct a first stirring treatment while stirring and a first temperature increase. Add stabilizer, organic solvent, lubricant, plasticizer, and pigment mixture to Preparation Tank 2, conduct a second stirring treatment while stirring and a second temperature increase, mix the solutions inside Preparation Tank 2 and Preparation Tank 1, conduct a third stirring treatment while stirring and a third temperature increase, and add the defoaming agent to obtain the raw material of the finished TPU film;

[0049] S3. Roll the obtained raw material of the finished TPU film into shape through a calender to obtain the TPU material layer.

[0050] Further, the stabilizer is one or a mixture of more than one of dimethyltriamine pentaacetic acid, cysteine, and butyl hydroxybenzaldehyde, and the lubricant is one or a mixture of more than one of polytetrafluoroethylene, lubricating grease, and graphite powder.

[0051] Further, the plasticizer is one or a mixture of more than one of dibutyl phthalate, dioctyl phthalate, and triol phosphate, and the pigment mixture is one or a mixture of more than one of rapeseed yellow, alizarin red, phthalocyanine blue, and phthalate diamino benzoate.

[0052] Further, the first stirring in step S2 needs to be carried out at a rotation speed of 600 - 800 r / min for stirring and mixing for 10 - 30 min, and the first temperature increase is 100 - 175 °C; the second stirring in step S2 needs to be carried out at a rotation speed of 500 - 900 r / min for stirring and mixing for 10 - 20 min, and the second temperature increase is 120 - 220 °C; the third stirring in step S2 needs to be carried out at a rotation speed of 900 - 1500 r / min for stirring and mixing for 30 - 60 min, and the third temperature increase is 150 - 300 °C.

[0053] The application of the TPU film with the optical texture effect in the production of injection molded parts includes the following specific steps:

[0054] (1) Mold the TPU material layer on the PET release layer;

[0055] (2) Coat the surface of the TPU material layer with a photonic crystal material to form a layer of photonic crystal material layer;

[0056] (3) Cut the TPU material layer coated with the photonic crystal material into sheets to obtain an optical TPU film sheet, and punch the hanging nail holes at the relative positions according to the specific mold size;

[0057] (4) Set hanging nails on the injection mold, and engrave different textures on the mold as needed;

[0058] (5) Hang the optical TPU film sheet on the hanging nails and inject a layer of injection molding material layer;

[0059] (6) After the injection molded part is formed, take out the semi-finished injection molded part;

[0060] (7) Trim the edges and package the finished product.

[0061] Further, after completing step (2) of coating the photonic crystal, the following operations are also required:

[0062] (201) Press different texture effects on the surface of the coated photonic crystal material layer;

[0063] (202) Different patterns, texts, and colors can be printed on the surface as needed, and water-based inks and bio-based inks can be used.

[0064] Preparation method of bio-based ink:

[0065] (1) Weigh the required weight portions of polymer resin, plasticizer, viscosity regulator, organic solvent, and fragrance.

[0066] (2) Use the mixing and stirring method to prepare the bio-based ink. During actual operation, mix the polymer resin, plasticizer, viscosity regulator, organic solvent, and fragrance, and conduct stirring treatment. Stirring needs to be carried out at a rotation speed of 200 - 500 r / min for 30 - 40 min, and the heating temperature is 50 - 100 °C to ensure that all components are evenly dispersed, obtaining semi-finished bio-based ink.

[0067] (3) Conduct hot melt forming on the semi-finished bio-based ink. As needed, the overall color can be inspected by adjusting the formula or adding specific additives. After meeting the standards, the finished hot melt adhesive is obtained.

[0068] (4) Pack the finished bio-based ink into appropriate containers and conduct sealed packaging, and control the sealing temperature at 5 - 15 °C.

[0069] Photonic crystals are composed of periodically arranged dielectric structures or their inverse structures in an orderly manner in two or three dimensions. Since this periodic dielectric material at the optical wave scale has the ability to control light waves, it is called a photonic crystal. The photonic crystal material of the present invention is an eco-friendly photonic crystal coating. It utilizes the unique properties of photonic crystals, which can not only meet people's demand for colors but also eliminate environmental pollution problems during the use of pigments. It is environmentally friendly, and by virtue of the diffraction effect of light by its periodic arrangement of a certain size, it can make the surface of the attached substrate emit a rainbow-like optical effect, greatly improving people's demand for colors and never fading, with good application effects.

[0070] The embodiments of the present invention provide the following technical solutions:

[0071] Example 1

[0072] A preparation method of a TPU material layer with an optical texture effect, including 80 parts of polyurethane, 5 parts of stabilizer, 50 parts of organic solvent, 5 parts of lubricant, 3 parts of plasticizer, 1 part of defoaming agent, and 5 parts of pigment mixture.

[0073]

[0074] S1. Prepare the required raw materials in advance, and weigh 80 parts of polyurethane, 5 parts of stabilizer, 50 parts of organic solvent, 5 parts of lubricant, 3 parts of plasticizer, 1 part of defoaming agent, and 5 parts of pigment mixture;

[0075] S2. Mix a part of the weighed raw materials. Add polyurethane, organic solvent, and plasticizer into Preparation Tank 1 in sequence, and perform a first stirring process synchronously. While stirring, perform a first temperature increase. The first stirring needs to be stirred and mixed at a speed of 600 r / min for 10 min, and the first temperature increase is 150 °C. Add stabilizer, organic solvent, lubricant, plasticizer, and pigment mixture into Preparation Tank 2, perform a second stirring process synchronously. While stirring, perform a second temperature increase. The second stirring needs to be stirred and mixed at a speed of 500 r / min for 10 min, and the second temperature increase is 200 °C. Mix the solutions inside Preparation Tank 2 and Preparation Tank 1, perform a third stirring process synchronously. While stirring, perform a third temperature increase. The third stirring needs to be stirred and mixed at a speed of 900 r / min for 30 min, and the third temperature increase is 250 °C. Add defoaming agent to obtain the raw material of the finished TPU film;

[0076] S3. Roll and form the obtained raw material of the finished TPU film through a calender to obtain a TPU material layer.

[0077] The application of the TPU film with the optical texture effect in the production of injection-molded parts includes the following specific steps:

[0078] (1) Form the TPU material layer on a PET release layer pre-printed with a texture effect;

[0079] (2) Coat a photonic crystal material on the surface of the TPU material layer to form a layer of photonic crystal material layer;

[0080] (3) Cut the TPU material layer coated with the photonic crystal material into sheets to obtain an optical TPU film sheet. According to the specific size of the mold, punch the hanging nail holes in the relative positions;

[0081] (4) Set hanging nails on the injection mold, and engrave different textures on the mold as needed;

[0082] (5) Hang the optical TPU film sheet on the hanging nails and inject a layer of injection material layer;

[0083] (6) After the injection-molded part is formed, take out the semi-finished injection-molded part;

[0084] (7) Trim the edges and package the finished product.

[0085] Example 2

[0086] A preparation method of a TPU material layer with an optical texture effect, including 90 parts of polyurethane, 8 parts of stabilizer, 100 parts of organic solvent, 6 parts of lubricant, 15 parts of plasticizer, 5 parts of defoamer, 10 parts of pigment mixture, and 12 parts of bio-based material. The rest of the content of this example is the same as that of Example 1 and will not be elaborated here.

[0087] Example 3

[0088] A preparation method of a TPU material layer with an optical texture effect, including 100 parts of polyurethane, 15 parts of stabilizer, 150 parts of organic solvent, 9 parts of lubricant, 30 parts of plasticizer, 10 parts of defoamer, and 50 parts of pigment mixture.

[0089]

[0090] S1. Prepare the required raw materials in advance, and weigh 100 parts of polyurethane, 15 parts of stabilizer, 150 parts of organic solvent, 9 parts of lubricant, 30 parts of plasticizer, 10 parts of defoamer, and 50 parts of pigment mixture;

[0091] S2. Mix a part of the weighed raw materials. Add polyurethane, organic solvent, and plasticizer into Preparation Tank 1 in sequence, and conduct a primary stirring process while stirring and a primary temperature increase. The primary stirring needs to be stirred and mixed at a speed of 800 r / min for 30 min, and the primary temperature increase is 175 °C. Add stabilizer, organic solvent, lubricant, plasticizer, and pigment mixture into Preparation Tank 2, conduct a secondary stirring process while stirring and a secondary temperature increase. The secondary stirring needs to be stirred and mixed at a speed of 900 r / min for 20 min, and the secondary temperature increase is 220 °C. Mix the solutions inside Preparation Tank 2 and Preparation Tank 1, conduct a tertiary stirring process while stirring and a tertiary temperature increase. The tertiary stirring needs to be stirred and mixed at a speed of 1500 r / min for 60 min, and the tertiary temperature increase is 300 °C. Add defoamer to obtain the raw material of the finished TPU film;

[0092] S3. Roll and form the obtained raw material of the finished TPU film through a calender to obtain the TPU material layer.

[0093] The application of the TPU film with the optical texture effect in the production of injection molded parts includes the following specific steps:

[0094] (1) Form the TPU material layer on a PET release layer pre-printed with a texture effect;

[0095] (2) Coat a photonic crystal material on the surface of the TPU material layer to form a layer of photonic crystal material layer;

[0096] (3) Cut the TPU material layer coated with the photonic crystal material into sheets to obtain an optical TPU film sheet. Determine the size according to the specific mold size and punch the hanging nail holes in the relative positions.

[0097] (4) Set hanging nails on the injection mold and engrave different textures on the mold as needed.

[0098] (5) Hang the optical TPU film sheet on the hanging nails and inject an injection material layer.

[0099] (6) After the injection molded part is formed, take out the semi-finished injection molded part.

[0100] (7) Trim the edges and package the finished product.

[0101] Example 4

[0102] A preparation method of a TPU material layer with an optical texture effect, including 100 parts of polyurethane, 12 parts of stabilizer, 120 parts of organic solvent, 8 parts of lubricant, 24 parts of plasticizer, 8 parts of defoaming agent, 10 parts of pigment mixture, and 20 parts of bio-based material. The rest of the content of this example is the same as that of Example 3 and will not be repeated here.

[0103] Verification experiment on the application effect of TPU film in the production of injection molded parts in Examples 1 to 4.

[0104] 1. Test grouping

[0105] Test groups 1-4: TPU films prepared in Examples 1 to 4

[0106] Control group: TPU film in the prior art.

[0107] 2. Test method

[0108] Respectively take the TPU films in test groups 1-4 and the control group for actual testing. Set the test duration to 7 days and 30 days for grouped testing and conduct long-term detection.

[0109] 3. Test results: The TPU films in the examples are superior to the TPU films in the prior art in terms of the numerical values of bubbles, burrs, scratch length, presence or absence of penetration points, optical effects, and deformation length.

[0110] The test results are shown in the following table:

[0111] Test duration Number of tests Test environment Example 1 7 days 10 Indoor Example 2 30 days 100 Outdoor Comparative example 1 7 days 10 Indoor Comparative example 2 30 days 100 Outdoor

[0112] Specific parameter detection table of TPU film:

[0113]

[0114]

[0115] From the above table, it can be seen that by controlling the test variables, the test duration was set to 7 days and 30 days for grouped tests, the number of test subjects was controlled to be 10 in both cases, and comprehensive tests were conducted by changing the test location to indoor and outdoor. Through the tests, it can be known that the priority values of bubbles, burrs, scratch length values, presence or absence of through points, absence of optical effects, and deformation length values in Comparative Example 1 and Comparative Example 2 are all lower than the test data in Examples 1 - 4. Therefore, the TPU films in Examples 1 - 4 are used in the production of injection molded parts. The TPU film has an optical texture effect and can be injection molded with any material among TPU, nylon, PC, and nylon glass fiber mixture, meeting the application of the TPU film on various injection molded parts. It has a wide range of uses, and the optical effect of the TPU film never fades. It is environmentally friendly, recyclable, and friendly to the environment. At the same time, the content not described in detail in this specification belongs to the prior art well-known to those skilled in the art.

[0116] It should be noted that in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device comprising a series of elements not only includes those elements, but also includes other elements not expressly listed, or elements inherent to such process, method, article or device.

[0117] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. Application of a TPU film with an optical texture effect in the production of injection-molded parts, characterized in that, It includes the following specific steps: (1) Mold the TPU material layer on the PET release layer; (2) Coat the surface of the TPU material layer with a photonic crystal material to form a photonic crystal material layer; (3) Cut the TPU material layer coated with the photonic crystal material into sheets to obtain an optical TPU film sheet, and punch the hanging nail holes in the relative positions according to the specific mold size; (4) Set hanging nails on the injection mold and engrave different textures on the mold as needed; (5) Hang the optical TPU film sheet on the hanging nails and inject an injection material layer; (6) After the injection molded part is formed, take out the semi-finished injection molded part; (7) Trim the edges and package the finished product; After completing step (2) of coating the photonic crystal material, the following operations are also required: (201) Press different texture effects on the surface of the coated photonic crystal material layer; (202) Print different patterns, texts, and colors on the surface as needed, using water-based ink and bio-based ink; In step (5), the raw materials of the injection material layer are TPU, nylon, PC, or a mixture of nylon and glass fiber; The TPU film with the optical texture effect includes: TPU material layer; PET release layer, provided at the bottom of the TPU material layer; Photonic crystal material layer, provided on the top of the TPU material layer; During application, tear off the PET release layer and compound an injection material layer on the bottom of the TPU material layer; The raw materials of the TPU material layer specifically include the following raw materials in parts by weight: polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoamer, and pigment mixture. The raw materials specifically include the following raw materials in parts by weight: 75 - 100 parts of polyurethane, 5 - 15 parts of stabilizer, 50 - 150 parts of organic solvent, 5 - 9 parts of lubricant, 3 - 30 parts of plasticizer, 1 - 10 parts of defoamer, 5 - 15 parts of pigment mixture, and 10 - 20 parts of bio-based; The preparation method of the bio-based ink includes the following steps: (1) Weigh the required parts by weight of polymer resin, plasticizer, viscosity regulator, organic solvent, and fragrance; (2) Use the mixing and stirring method to prepare the bio-based ink. During actual operation, mix the polymer resin, plasticizer, viscosity regulator, organic solvent, and fragrance, and perform stirring treatment. Stirring needs to be carried out at a rotation speed of 200 - 500 r / min for 30 - 40 min, and the heating temperature is 50 - 100 °C to ensure that all components are evenly dispersed to obtain semi-finished bio-based ink; (3) Perform hot melt forming on the semi-finished bio-based ink. According to needs, adjust the formula or add additives to inspect the overall color. After meeting the standards, obtain the finished hot melt adhesive; (4) Pack the finished bio-based ink into appropriate containers and perform sealed packaging, and control the sealing temperature, which is 5 - 15 °C.

2. Application of the TPU film with an optical texture effect according to claim 1 in the production of injection-molded parts, characterized in that: The mixing mass ratio of the defoamer and the plasticizer is 1:

3.

3. Use of the TPU film with an optical texture effect according to claim 1 in the production of injection molded parts, characterized in that: The preparation method of the TPU material layer is as follows: S1. Prepare the required raw materials in advance and weigh the required weights of polyurethane, stabilizer, organic solvent, lubricant, plasticizer, defoamer, and pigment mixture; S2. The raw material extraction parts taken symmetrically are mixed. Polyurethane, a part of organic solvents and a plasticizer are sequentially added into the first preparation tank, and a primary stirring treatment is carried out synchronously. While stirring, a primary temperature rise is carried out. A stabilizer, the remaining organic solvents, a plasticizer, a lubricant and a pigment mixture are added into the second preparation tank, and a secondary stirring treatment is carried out synchronously. While stirring, a secondary temperature rise is carried out. The solutions inside the second preparation tank and the first preparation tank are mixed, and a tertiary stirring treatment is carried out synchronously. While stirring, a tertiary temperature rise is carried out. An antifoaming agent is added to obtain the raw material of the finished TPU film. S3. The obtained raw material of the finished TPU film is calendared by a calender to obtain a TPU material layer.

4. Use of the TPU film with an optical texture effect according to claim 3 in the production of injection molded parts, characterized in that: The stabilizer is one or a mixture of more of cysteine - type and butyl hydroxybenzaldehyde, and the lubricant is one or a mixture of more of polytetrafluoroethylene, lubricating grease and graphite powder.

5. The application of the TPU film with an optical texture effect according to claim 3 in the production of injection-molded parts, characterized in that: The plasticizer is one or a mixture of more of dibutyl phthalate and dioctyl phthalate, and the pigment mixture is one or a mixture of more of rapeseed yellow, alizarin red, phthalocyanine blue and o - diaminobenzoate.

6. The application of the TPU film with an optical texture effect according to claim 3 in the production of injection molded parts, characterized in that: The primary stirring in step S2 needs to be stirred and mixed at a rotation speed of 600 - 800 r / min for 10 - 30 min, and the primary temperature rise is 100 - 175 °C; the secondary stirring in step S2 needs to be stirred and mixed at a rotation speed of 500 - 900 r / min for 10 - 20 min, and the secondary temperature rise is 120 - 220 °C; the tertiary stirring in step S2 needs to be stirred and mixed at a rotation speed of 900 - 1500 r / min for 30 - 60 min, and the tertiary temperature rise is 150 - 300 °C.

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