A silver and black dual-color light-blocking film

Abstract

This invention provides a silver-black dual-color light-blocking film. The silver-black dual-color light-blocking film comprises a black film layer and a silver film layer bonded together. The raw materials for preparing the black film layer include the following components in parts by weight: 50-70 parts TPU particles, 7-30 parts black masterbatch, 1-3 parts lubricant A, and 1-3 parts compatibilizer A. The raw materials for preparing the silver film layer include the following components in parts by weight: 50-70 parts TPU particles, 5-8 parts silver masterbatch, 1-3 parts nano-titanium dioxide, 1-3 parts lubricant B, and 2-5 parts compatibilizer B. The silver-black dual-color light-blocking film provided by this invention has the advantages of being lightweight and thin, as well as having good light-blocking effect and good aging resistance.

Description

Technical Field

[0001] This invention belongs to the field of light-shielding material technology, specifically relating to a silver-black dual-color light-shielding film. Background Technology

[0002] With the development of science and technology and the continuous improvement of living standards, people have higher and higher requirements for the indoor environment. Curtains have become an indispensable item in homes or offices, playing functions such as regulating indoor lighting intensity, shading, and beautifying the indoor environment.

[0003] Currently, the commonly used blackout layers for curtains and roller blinds on the market mainly include coated fabrics and blackout fabrics. Coated fabrics are coated by applying a coating to the selected fabric using coating equipment, requiring 2-3 coats to achieve the desired effect. Furthermore, the coating paste on the fabric contains harmful solvents such as benzene compounds to achieve a smooth surface. Some coating pastes are synthesized from various chemical raw materials, seriously endangering the health of operators and users. Curtains and roller blinds using coated fabrics are also prone to aging, peeling, and are not resistant to washing or dry cleaning, making them difficult to clean later and affecting their appearance. Woven fabrics are woven on a jacquard machine, using a base layer, a surface layer, and a row of black blackout yarns in the middle. These fabrics have a high weight and high raw material costs. Therefore, research on bonding a blackout film to the base layer of the fabric to create blackout curtains has attracted widespread attention.

[0004] Polyurethane is a linear polymer material produced by the reaction of diisocyanate, oligomeric polyol, and chain extender. It is non-toxic, odorless, and decomposes on its own within a certain period of time without causing environmental pollution, thus exhibiting good environmental friendliness. Therefore, how to use polyurethane to prepare blackout curtain film has become a research hotspot.

[0005] CN107962846A discloses a method for preparing a multi-layered, light-blocking, sound-absorbing, halogen-free, flame-retardant, multi-functional curtain fabric. The preparation method includes the following steps: (1) PA6 granules, TPU granules, and MMT powder are dried and mixed separately. The mixture is placed in a high-speed mixer and mixed at 650-750 r / min for 5-7 min. After thorough mixing, it is bagged for later use; (2) The premixed mixture and PAH-1 flame retardant are granulated by a co-rotating twin-screw granulator, cooled, granulated, and dried. The mixture is then blown into a film in a single-screw blown film machine to prepare a TPU-PA reinforced composite film; (3) The TPU-PA reinforced composite film is bonded to the fabric on a flat vulcanizing machine using hot melt adhesive to produce a multi-layered composite light-blocking curtain. If the curtain fabric prepared by this technical solution is required to have a better light-blocking effect, the TPU-PA reinforced composite film needs to be thicker, resulting in a heavier fabric.

[0006] CN114349928A discloses a polyurethane TPU curtain lining layer and its preparation method. The polyurethane TPU curtain lining layer comprises the following components in parts by weight: 45-60 parts of diol, 35-50 parts of isocyanate, 0.05-0.25 parts of dilauryl dibutyltin, and 1.25-6.5 parts of inorganic filler; the isocyanate is one or both of toluene diisocyanate and 4,4-diphenylmethane diisocyanate; the inorganic filler includes carbonates, silicates, and carbon materials; the carbonate includes one or both of nano-calcium carbonate and light calcium carbonate; the carbon material is one or more of carbon black, graphite, carbon nanotubes, and graphene oxide. The preparation method of the polyurethane TPU curtain lining layer is as follows: Diol, isocyanate, and inorganic filler are mixed and stirred evenly; dibutyltin dilaurate catalyst is added; and a polymerization reaction is initiated by heating to obtain polyurethane TPU. The polyurethane TPU is then extruded and cast to obtain the polyurethane TPU curtain lining layer, the thickness of which is 1–3 mm. The polyurethane TPU curtain lining layer prepared by this method has poor aging resistance, and its excessive thickness results in a large weight.

[0007] As can be seen from the above, in order to produce curtains with good light-blocking properties, a thick TPU light-blocking layer is usually required in the existing technology, resulting in a large weight and failing to meet the requirements of being lightweight and thin. Therefore, how to produce a light-blocking film that is resistant to aging, lightweight, thin, and has good light-blocking effect has become an urgent technical problem to be solved. Summary of the Invention

[0008] To address the shortcomings of existing technologies, the present invention aims to provide a silver-black dual-color light-blocking film. This invention designs the structure of the silver-black dual-color light-blocking film to include a black film layer and a silver film layer bonded together. Furthermore, the raw materials for preparing the black and silver film layers are designed to give the silver film layer better light reflection and the black film layer better light absorption. Through the combined effect of the black and silver film layers, a light-blocking film that is lightweight, thin, and provides good light-blocking performance is obtained.

[0009] To achieve this objective, the present invention adopts the following technical solution:

[0010] The present invention provides a silver-black dual-color light-blocking film, wherein the silver-black dual-color light-blocking film comprises a black film layer and a silver film layer bonded together;

[0011] The raw materials for preparing the black film layer include the following components in parts by weight: 50-70 parts TPU particles, 7-30 parts black masterbatch, 1-3 parts lubricant, and 1-3 parts compatibilizer;

[0012] The raw materials for preparing the silver thin film layer include the following components in parts by weight: 50-70 parts TPU particles, 5-8 parts silver masterbatch, 1-3 parts nano titanium dioxide, 1-3 parts lubricant, and 1-3 parts compatibilizer.

[0013] In this invention, the raw materials for preparing the black and silver thin film layers are designed so that the silver thin film layer has a better light reflection effect and the black thin film layer has a better light absorption effect. Through the combined effect of the black and silver thin film layers, a light-shielding film with lightweight and good light-shielding effect is prepared.

[0014] In this invention, by controlling the weight proportions of black masterbatch and silver masterbatch within specific ranges, a silver-black dual-color light-blocking film with good light-blocking effect is prepared. If the amount of each is too small, the light-blocking effect of the prepared light-blocking film will be poor; if the amount of each is too large, it will increase the production cost of the light-blocking film, which is not conducive to industrial production and use.

[0015] In this invention, the synergistic effect of the silver film layer and nano-titanium dioxide enhances the light reflection effect of the silver film layer, resulting in a silver-black dual-color light-shielding film with good light-shielding properties. Furthermore, the use of nano-titanium dioxide further improves the weather resistance of the silver-black dual-color film.

[0016] In this invention, the weight percentage of TPU particles in the raw materials for preparing the black thin film layer can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 68 parts, or 70 parts, etc.

[0017] The weight percentage of the black masterbatch can be 7, 10, 12, 15, 18, 20, 23, 25, 27, or 30 parts, etc.

[0018] The weight percentage of the lubricant A can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0019] The compatibilizer A can be present in parts by weight of 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0020] In this invention, the weight percentage of TPU particles in the raw materials for preparing the silver thin film layer can be 50 parts, 52 parts, 54 parts, 56 parts, 58 parts, 60 parts, 62 parts, 64 parts, 68 parts, or 70 parts, etc.

[0021] The weight percentage of the silver mother can be 5 parts, 5.5 parts, 6 parts, 6.5 parts, 7 parts, 7.5 parts, or 8 parts, etc.

[0022] The weight percentage of the nano-titanium dioxide can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc. The weight percentage of the lubricant B can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0023] The compatibilizer B can be present in parts by weight of 2, 2.5, 3, 3.5, 4, 4.5, or 5, etc.

[0024] It should be noted that the black masterbatch and silver masterbatch described in this invention are preferably polyurethane black masterbatch and polyurethane silver masterbatch.

[0025] The following are preferred technical solutions of the present invention, but are not intended to limit the technical solutions provided by the present invention. The purpose and beneficial effects of the present invention can be better achieved and realized through the following preferred technical solutions.

[0026] As a preferred technical solution of the present invention, the raw materials for preparing the TPU particles include the following components: 10-20 parts of polyester diol, 10-20 parts of polyether diol, 10-25 parts of diisocyanate, 3-10 parts of chain extender, 1-3 parts of organosilicon, and 1-3 parts of ultraviolet absorber.

[0027] In this invention, by designing the raw materials for preparing TPU particles and using polyester diol and polyether diol, the TPU particles have better mechanical properties; furthermore, the weather resistance of the TPU particles is improved through the combined action of organosilicon and ultraviolet absorber.

[0028] In this invention, the weight parts of the polyester diol can be 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 or 20 parts, etc.

[0029] The polyether diol can be in parts by weight of 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, or 20 parts, etc.

[0030] The weight parts of the diisocyanate can be 10, 12, 14, 16, 18, 20, 22, 24, or 25 parts, etc.

[0031] The chain extender can be present in parts by weight of 3, 4, 5, 6, 7, 8, 9, or 10, etc.

[0032] The organosilicon can be in parts by weight of 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0033] The amount of ultraviolet absorber by weight can be 1 part, 1.5 parts, 2 parts, 2.5 parts, or 3 parts, etc.

[0034] As a preferred embodiment of the present invention, the number average molecular weight of the polyester diol is 300 to 4000, for example, it can be 300, 500, 1000, 1500, 2000, 2500, 3000, 3500 or 4000.

[0035] Preferably, the polyester diol is selected from any one or a combination of at least two of polybutylene adipate diol, polyethylene adipate diol, or polycaprolactone diol.

[0036] Preferably, the number average molecular weight of the polyether diol is 400 to 4000, for example, it can be 400, 500, 1000, 1500, 2000, 2500, 3000, 3500 or 4000.

[0037] Preferably, the polyether diol is polytetrahydrofuran ether diol and / or polytetramethylene ether diol.

[0038] As a preferred embodiment of the present invention, the organosilicon is aminopropyl-terminated polydimethylsiloxane.

[0039] Preferably, the ultraviolet absorber is selected from any one or a combination of at least two of UV-326, UV-327, UV-328, UV-329, UV-360, UV-P, UV-234 or UV-1130.

[0040] As a preferred embodiment of the present invention, the raw materials for preparing the TPU particles further include 0.04 to 0.1 parts of catalyst, for example, 0.04 parts, 0.05 parts, 0.06 parts, 0.07 parts, 0.08 parts, 0.09 parts or 0.1 parts, etc.

[0041] Preferably, the catalyst is selected from dibutyltin dilaurate and / or stannous isooctanoate.

[0042] Preferably, the raw materials for preparing the TPU particles also include 1 to 2 parts of lubricant C1, for example, 1 part, 1.2 parts, 1.4 parts, 1.6 parts, 1.8 parts, or 2 parts.

[0043] Preferably, the lubricant C is selected from any one or a combination of at least two of ethylene bis-stearamide, erucamide, or oleamide.

[0044] In this invention, the TPU particles are prepared as follows:

[0045] (1) After vacuum drying and dehydration treatment of polyester diol, polyether diol, organosilicon and diisocyanate, they are mixed evenly and some catalyst is added to them. The polymerization reaction is carried out at 70-80℃ for 3-5 hours to obtain polyurethane prepolymer.

[0046] (2) The polyurethane prepolymer, chain extender, ultraviolet absorber and remaining catalyst obtained in step (1) are mixed and then extruded and granulated to obtain the TPU particles.

[0047] As a preferred embodiment of the present invention, the lubricant A and lubricant B are each independently selected from any one or a combination of at least two of polyethylene wax, zinc stearate, or ethylene bis-stearamide.

[0048] Preferably, compatibilizer A and compatibilizer B are each independently selected from polyethylene grafted maleic anhydride and / or polypropylene grafted maleic anhydride.

[0049] Preferably, the D of the nano-titanium dioxide 50 The particle size is 30-50nm, for example, it can be 30nm, 32nm, 34nm, 36nm, 38nm, 40nm, 42nm, 44nm, 46nm, 48nm or 50nm, etc.

[0050] As a preferred embodiment of the present invention, the raw materials for preparing the black film layer and the raw materials for preparing the silver film layer each independently include 1 to 3 parts of a dispersant, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, etc.

[0051] Preferably, the dispersant is selected from oxidized polyethylene wax.

[0052] As a preferred embodiment of the present invention, the raw materials for preparing the black film layer and the raw materials for preparing the silver film layer each independently include 1 to 3 parts of antioxidant, for example, 1 part, 1.5 parts, 2 parts, 2.5 parts or 3 parts, etc.

[0053] Preferably, the antioxidant is selected from any one or a combination of at least two of the following: triphenyl phosphite, triisodecyl phosphite, phenyl diisodecyl phosphite, or dioctyl phosphite.

[0054] As a preferred technical solution of the present invention, the thickness of the silver-black dual-color light-blocking film is 0.01 to 0.04 mm, for example, it can be 0.01 mm, 0.015 mm, 0.02 mm, 0.025 mm, 0.03 mm, 0.035 mm or 0.04 mm, etc.

[0055] In this invention, the preparation method of the silver-black dual-color light-blocking film includes the following steps:

[0056] (A) The raw materials for preparing the black thin film layer are mixed evenly to obtain the first mixture;

[0057] The raw materials for preparing the silver thin film layer are mixed evenly to obtain a second mixture;

[0058] (B) Using a double-layer co-extrusion and double-layer composite film blow molding die head, the first mixture and the second mixture prepared in step (A) are blow molded to obtain the silver-black dual-color light-blocking film.

[0059] This invention provides an application of the silver-black dual-color blackout film as described above in blackout curtains.

[0060] Compared with the prior art, the present invention has the following beneficial effects:

[0061] In this invention, the raw materials for preparing the black and silver thin film layers are designed, and further, the raw materials for preparing TPU particles are designed to give the silver thin film layer good light reflection and the black thin film layer good light absorption. Through the combined effect of the black and silver thin film layers, a light-shielding film with lightweight and good light-shielding effect is prepared. Simultaneously, the prepared silver-black dual-color light-shielding film exhibits good aging resistance, with a basis weight of 28–43 g / m³. 2 Light transmittance <6%, ranging from 4.3% to 5.6%, and tensile strength retention >93%, ranging from 93.4% to 94.7%. Detailed Implementation

[0062] To facilitate understanding of the present invention, the following embodiments are provided. Those skilled in the art should understand that these embodiments are merely illustrative and should not be construed as limiting the scope of the invention.

[0063] The sources of some components in the examples and comparative examples are as follows:

[0064] Polybutylene adipate diol: Jining Huakai Resin Co., Ltd.;

[0065] Polyethylene adipate diol: Yantai Huada Chemical Industry Co., Ltd.;

[0066] Polycaprolactone diol: Daicel Corporation, Japan, CAPA7201A;

[0067] Polytetrahydrofuran ether diol: BASF, PTMG1000;

[0068] Polytetramethylene ether glycol: DuPont, USA;

[0069] Aminopropyl-terminated polydimethoxysiloxane: Chengdu Gracey Chemical Technology Co., Ltd.;

[0070] Black masterbatch: Baoliwei Plastics Co., Ltd.;

[0071] Silver motherboard: Baoliwei Plastics Co., Ltd.;

[0072] Nano titanium dioxide: Wuhan Xingzhongcheng Technology Co., Ltd.;

[0073] Polyethylene grafted with maleic anhydride: Guangdong Chuanheng New Material Technology Co., Ltd.;

[0074] Oxidized polyethylene wax: Qingdao Bonnie Chemical Co., Ltd.

[0075] Example 1

[0076] This embodiment provides a silver-black dual-color light-blocking film, which includes a black film layer and a silver film layer that are bonded together.

[0077] The raw materials for preparing the black film layer include the following components in parts by weight: 60 parts TPU particles, 8 parts black masterbatch, 2 parts polyethylene wax, 2 parts polyethylene grafted maleic anhydride, 1 part oxidized polyethylene wax, and 3 parts triisodecyl phosphite.

[0078] The raw materials for preparing the silver film layer include the following components in parts by weight: 70 parts TPU particles, 6 parts silver masterbatch, 2 parts nano titanium dioxide, 3 parts polyethylene wax, 2 parts polyethylene grafted maleic anhydride, 2 parts oxidized polyethylene wax, and 2 parts triphenyl phosphite.

[0079] The raw materials for preparing the TPU particles include the following components: 18 parts of polybutylene adipate diol, 15 parts of polytetramethylene ether diol, 20 parts of 1,6-hexamethylene diisocyanate, 7 parts of 1,4-butanediol, 2 parts of aminopropyl-terminated polydimethylsiloxane, 2 parts of UV-326, 0.07 parts of stannous isooctanoate, and 2 parts of ethylene bis-stearamide.

[0080] The preparation method of the above-mentioned TPU particles includes the following steps:

[0081] (1) Polybutylene adipate diol, polytetramethylene ether diol, aminopropyl-terminated polydimethylsiloxane and 1,6-hexanediisocyanate were vacuum dried and dehydrated, then mixed evenly, and a portion of stannous isooctanoate (0.04 parts) was added to it. The polymerization reaction was carried out at 70°C for 5 h to obtain polyurethane prepolymer.

[0082] (2) The polyurethane prepolymer obtained in step (1), 1,4-butanediol, UV-326 and the remaining stannous isooctanoate and optional ethylene bis-stearamide are mixed and then extruded and granulated to obtain the TPU particles.

[0083] The preparation method of the silver-black dual-color light-blocking film includes the following steps:

[0084] (A) The raw materials for preparing the black thin film layer are mixed evenly to obtain the first mixture;

[0085] The raw materials for preparing the silver thin film layer are mixed evenly to obtain a second mixture;

[0086] (B) Using a double-layer co-extrusion and double-layer composite film blow molding die head, the first mixture and the second mixture prepared in step (A) are blow molded to obtain the silver and black dual-color light-blocking film; wherein the thickness of the black film layer is 0.01 mm and the thickness of the silver film layer is 0.02 mm.

[0087] Example 2

[0088] This embodiment provides a silver-black dual-color light-blocking film, which includes a black film layer and a silver film layer that are bonded together.

[0089] The raw materials for preparing the black film layer include the following components in parts by weight: 50 parts TPU particles, 7 parts black masterbatch, 1 part ethylene bis-stearamide, 3 parts polyethylene grafted maleic anhydride, 3 parts oxidized polyethylene wax, and 1 part phenyl diisodecyl phosphite.

[0090] The raw materials for preparing the silver film layer include the following components in parts by weight: 70 parts TPU particles, 8 parts silver masterbatch, 3 parts nano titanium dioxide, 3 parts zinc stearate, 4 parts polyethylene grafted maleic anhydride, 1 part oxidized polyethylene wax, and 1 part phenyl diisodecyl phosphite.

[0091] The raw materials for preparing the TPU particles include the following components: 10 parts of polyethylene adipate diol, 20 parts of polytetramethylene ether diol, 10 parts of 4,4-dicyclohexylmethane diisocyanate, 3 parts of trimethylolpropane, 1 part of aminopropyl-terminated polydimethylsiloxane, 3 parts of UV-327, 0.04 parts of stannous isooctanoate, and 1 part of ethylene bis-stearamide.

[0092] The preparation method of the above-mentioned TPU particles includes the following steps:

[0093] (1) Polyethylene adipate diol, polytetramethylene ether diol, aminopropyl-terminated polydimethylsiloxane and 4,4-dicyclohexylmethane diisocyanate were vacuum dried and dehydrated, then mixed evenly, and a portion of stannous isooctanoate (0.02 parts) was added to it. The polymerization reaction was carried out at 80°C for 3 hours to obtain polyurethane prepolymer;

[0094] (2) The polyurethane prepolymer obtained in step (1), trimethylolpropane, UV-327, the remaining stannous isooctanoate and ethylene bis-stearamide are mixed and then extruded and granulated to obtain the TPU particles.

[0095] The preparation method of the silver-black dual-color light-blocking film includes the following steps:

[0096] (A) The raw materials for preparing the black thin film layer are mixed evenly to obtain the first mixture;

[0097] The raw materials for preparing the silver thin film layer are mixed evenly to obtain a second mixture;

[0098] (B) Using a double-layer co-extrusion and double-layer composite film blow molding die head, the first mixture and the second mixture prepared in step (A) are blow molded to obtain the silver and black dual-color light-blocking film; wherein the thickness of the black film layer is 0.005 mm and the thickness of the silver film layer is 0.005 mm.

[0099] Example 3

[0100] This embodiment provides a silver-black dual-color light-blocking film, which includes a black film layer and a silver film layer that are bonded together.

[0101] The raw materials for preparing the black film layer include the following components in parts by weight: 70 parts TPU particles, 15 parts black masterbatch, 3 parts zinc stearate, 2 parts polyethylene grafted maleic anhydride, 3 parts oxidized polyethylene wax, and 3 parts dioctyl phosphite.

[0102] The raw materials for preparing the silver film layer include the following components in parts by weight: 50 parts TPU particles, 5 parts silver masterbatch, 3 parts nano titanium dioxide, 2 parts polyethylene wax, 2 parts polyethylene grafted maleic anhydride, 3 parts oxidized polyethylene wax, and 2 parts dioctyl phosphite.

[0103] The raw materials for preparing the TPU particles include the following components: 20 parts of polycaprolactone diol, 20 parts of polytetrahydrofuran ether diol, 25 parts of isophorone diisocyanate, 10 parts of 1,3-propanediol, 3 parts of aminopropyl-terminated polydimethylsiloxane, 1 part of UV-1130, 0.1 parts of dibutyltin dilaurate, and 1 part of oleamide.

[0104] The preparation method of the above-mentioned TPU particles includes the following steps:

[0105] (1) Polycaprolactone diol, polytetrahydrofuran ether diol, aminopropyl-terminated polydimethylsiloxane and isophorone diisocyanate were vacuum dried and dehydrated, then mixed evenly, and a portion of dibutyltin dilaurate (0.05 parts) was added to it. The polymerization reaction was carried out at 75°C for 4 hours to obtain polyurethane prepolymer.

[0106] (2) The polyurethane prepolymer obtained in step (1), 1,3-propanediol, UV-1130, the remaining dibutyltin dilaurate and oleamide are mixed and then extruded and granulated to obtain the TPU particles.

[0107] The preparation method of the silver-black dual-color light-blocking film includes the following steps:

[0108] (A) The raw materials for preparing the black thin film layer are mixed evenly to obtain the first mixture;

[0109] The raw materials for preparing the silver thin film layer are mixed evenly to obtain a second mixture;

[0110] (B) Using a double-layer co-extrusion and double-layer composite film blow molding die head, the first mixture and the second mixture prepared in step (A) are blow molded to obtain the silver and black dual-color light-blocking film; wherein the thickness of the black film layer is 0.01 mm and the thickness of the silver film layer is 0.01 mm.

[0111] Example 4

[0112] This embodiment provides a silver-black dual-color light-blocking film, which includes a black film layer and a silver film layer that are bonded together.

[0113] The raw materials for preparing the black film layer include the following components in parts by weight: 55 parts TPU particles, 20 parts black masterbatch, 2 parts zinc stearate, 2 parts polyethylene grafted maleic anhydride, 3 parts oxidized polyethylene wax, and 1 part triisodecyl phosphite.

[0114] The raw materials for preparing the silver film layer include the following components in parts by weight: 60 parts TPU particles, 7 parts silver masterbatch, 2 parts nano titanium dioxide, 3 parts ethylene bis-stearamide, 5 parts polyethylene grafted maleic anhydride, 2 parts oxidized polyethylene wax, and 3 parts triphenyl phosphite.

[0115] The raw materials for preparing the TPU particles include the following components: 12 parts of polycaprolactone diol, 18 parts of polytetrahydrofuran ether diol, 22 parts of 1,6-hexamethylene diisocyanate, 7 parts of 1,2-ethylene glycol, 2 parts of aminopropyl-terminated polydimethylsiloxane, 3 parts of UV-234, 0.08 parts of dibutyltin dilaurate, and 2 parts of oleamide.

[0116] The preparation method of the above-mentioned TPU particles includes the following steps:

[0117] (1) Polycaprolactone diol, polytetrahydrofuran ether diol, aminopropyl-terminated polydimethylsiloxane and 1,6-hexamethylene diisocyanate were vacuum dried and dehydrated, then mixed evenly, and a portion of dibutyltin dilaurate (0.04 parts) was added to it. The polymerization reaction was carried out at 70°C for 5 h to obtain polyurethane prepolymer.

[0118] (2) The polyurethane prepolymer obtained in step (1), 1,2-ethylene glycol, UV-234, the remaining dibutyltin dilaurate and oleamide are mixed and then extruded and granulated to obtain the TPU particles.

[0119] The preparation method of the silver-black dual-color light-blocking film includes the following steps:

[0120] (A) The raw materials for preparing the black thin film layer are mixed evenly to obtain the first mixture;

[0121] The raw materials for preparing the silver thin film layer are mixed evenly to obtain a second mixture;

[0122] (B) Using a double-layer co-extrusion and double-layer composite film blow molding die head, the first mixture and the second mixture prepared in step (A) are blow molded to obtain the silver and black dual-color light-blocking film; wherein the thickness of the black film layer is 0.02 mm and the thickness of the silver film layer is 0.02 mm.

[0123] Example 5

[0124] This embodiment provides a silver-black dual-color light-blocking film. The only difference from Embodiment 1 is that the raw materials for preparing the silver film layer do not contain nano-titanium dioxide, and the weight of the silver masterbatch is 8 parts. Other conditions are the same as in Embodiment 1.

[0125] Example 6

[0126] This embodiment provides a silver-black dual-color light-blocking film. The only difference from Embodiment 1 is that the raw materials for preparing the silver film layer do not contain silver masterbatch, and the weight of nano-titanium dioxide is 8 parts. Other conditions are the same as in Embodiment 1.

[0127] Example 7

[0128] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the raw materials for preparing the TPU particles do not contain aminopropyl-terminated polydimethylsiloxane, and the weight of UV-326 is 4 parts. Other conditions are the same as in Embodiment 1.

[0129] Example 8

[0130] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the raw materials for preparing the TPU particles do not contain UV-326, and the weight of aminopropyl-terminated polydimethylsiloxane is 4 parts. Other conditions are the same as in Embodiment 1.

[0131] Example 9

[0132] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the black masterbatch in the raw materials for preparing the black film layer is 7 parts, and the weight of the silver masterbatch in the raw materials for preparing the silver film layer is 5 parts. Other conditions are the same as in Embodiment 1.

[0133] Example 10

[0134] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the black masterbatch in the raw materials for preparing the black film layer is 30 parts, and the weight of the silver masterbatch in the raw materials for preparing the silver film layer is 8 parts. Other conditions are the same as in Embodiment 1.

[0135] Comparative Example 1

[0136] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the black masterbatch in the raw materials for preparing the black film layer is 5 parts, while other conditions are the same as in Embodiment 1.

[0137] Comparative Example 2

[0138] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the black masterbatch in the raw materials for preparing the black film layer is 35 parts, while other conditions are the same as in Embodiment 1.

[0139] Comparative Example 3

[0140] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the silver masterbatch in the raw materials for preparing the silver film layer is 3 parts, and the other conditions are the same as in Embodiment 1.

[0141] Comparative Example 4

[0142] This embodiment provides a silver-black dual-color light-blocking film, which differs from Embodiment 1 only in that the weight of the silver masterbatch in the raw materials for preparing the silver film layer is 10 parts, while other conditions are the same as in Embodiment 1.

[0143] Comparative Example 5

[0144] This comparative example provides a black light-blocking film, the raw materials for which the black light-blocking film is prepared include the following components in parts by weight: 60 parts TPU particles, 8 parts black masterbatch, 2 parts polyethylene wax, 2 parts polyethylene grafted maleic anhydride, 1 part oxidized polyethylene wax, and 3 parts triisodecyl phosphite.

[0145] The raw materials and preparation method for the TPU particles are the same as in Example 1.

[0146] The preparation method of the above-mentioned black light-blocking film is as follows:

[0147] (A) Mix the raw materials for preparing the black light-blocking layer evenly to obtain a mixture;

[0148] (B) The mixture prepared in step (A) is blow-molded to obtain the black light-blocking film; wherein the thickness of the black light-blocking film is 0.03 mm.

[0149] Comparative Example 6

[0150] This comparative example provides a silver light-blocking film, characterized in that the raw materials for preparing the silver light-blocking film include the following components in parts by weight: 70 parts TPU particles, 6 parts silver masterbatch, 2 parts nano titanium dioxide, 3 parts polyethylene wax, 2 parts polyethylene grafted maleic anhydride, 2 parts oxidized polyethylene wax, and 2 parts triphenyl phosphite.

[0151] The raw materials and preparation method for the TPU particles are the same as in Example 1.

[0152] The preparation method of the above-mentioned silver light-shielding film is as follows:

[0153] (A) Mix the raw materials for preparing the silver light-blocking layer evenly to obtain a mixture;

[0154] (B) The mixture prepared in step (A) is blow-molded to obtain the silver light-shielding film; wherein the thickness of the silver light-shielding film is 0.03 mm.

[0155] The performance of the light-shielding films provided in the above embodiments and comparative examples was tested using the following methods:

[0156] Weight: Cut the light-shielding film provided in the above examples and comparative examples into 1m×1m samples (3 samples), weigh them, and take the average weight of the 3 samples as the weight in grams;

[0157] Light transmittance: GB / T2410-2008;

[0158] Tensile strength retention rate: ASTM D1148-2013.

[0159] The performance test results of the light-shielding films provided in the above embodiments and comparative examples are shown in Table 1 below:

[0160] Table 1

[0161]

[0162]

[0163] As shown in Table 1, this invention designs the raw materials for the black and silver film layers, and further designs the TPU particle raw materials to give the silver film layer good light reflection and the black film layer good light absorption. Through the combined effect of the black and silver film layers, a lightweight light-shielding film with good light-shielding effect is prepared. The resulting silver-black dual-color light-shielding film also exhibits good aging resistance, with a basis weight of 28–43 g / m³. 2 Light transmittance <6%, ranging from 4.3% to 5.6%, and tensile strength retention >93%, ranging from 93.4% to 94.7%.

[0164] Compared with Example 1, if the raw materials for preparing the silver film layer do not contain nano-titanium dioxide or silver masterbatch (Examples 5-6), the prepared silver-black bicolor light-blocking film has poor light-blocking properties and high light transmittance.

[0165] Compared with Example 1, if the raw materials for preparing TPU ions do not contain ultraviolet absorbers or organosilicon (Examples 7-8), the aging resistance of the prepared silver-black dual-color light-shielding film is poor.

[0166] Compared with Example 1, if the content of black masterbatch in the black film layer is too low (Comparative Example 1) or the content of silver masterbatch in the silver film layer is too low (Comparative Example 3), the prepared silver-black dual-color light-blocking film has poor light-blocking performance and high light transmittance. If the content of black masterbatch in the black film layer is too high (Comparative Example 2) or the content of silver masterbatch in the silver film layer is too low (Comparative Example 4), it will not significantly improve the light-blocking performance of the silver-black dual-color light-blocking film. On the contrary, it will increase the production cost of the silver-black dual-color light-blocking film and is not suitable for industrial production.

[0167] Compared with Example 1, if only a black film layer is used as the light-shielding film (Comparative Example 5) or only a silver film layer is used as the light-shielding layer (Comparative Example 6), the light-shielding film prepared has poor light-shielding performance and high light transmittance.

[0168] In summary, this invention designs the raw materials for preparing the black and silver thin film layers, and further designs the raw materials for preparing TPU particles, so that the silver thin film layer has a better light reflection effect and the black thin film layer has a better light absorption effect. Through the combined effect of the black and silver thin film layers, a light-shielding film with lightweight and good light-shielding effect is prepared. At the same time, the prepared silver-black dual-color light-shielding film has good aging resistance.

[0169] The applicant declares that the detailed process flow of this invention is illustrated by the above embodiments, but this invention is not limited to the above detailed process flow, that is, it does not mean that this invention must rely on the above detailed process flow to be implemented. Those skilled in the art should understand that any improvements to this invention, equivalent substitutions of raw materials for the product of this invention, addition of auxiliary components, and selection of specific methods, etc., all fall within the protection scope and disclosure scope of this invention.

Claims

1. A silver-black dual-color light-blocking film, characterized in that, The silver-black dual-color light-blocking film includes a black film layer and a silver film layer that are bonded together. The raw materials for preparing the black film layer include the following components in parts by weight: 50-70 parts TPU particles, 7-30 parts black masterbatch, 1-3 parts lubricant A and 1-3 parts compatibilizer A; The raw materials for preparing the silver thin film layer include the following components in parts by weight: 50-70 parts TPU particles, 5-8 parts silver masterbatch, 1-3 parts nano titanium dioxide, 1-3 parts lubricant B and 2-5 parts compatibilizer B; The raw materials for preparing the TPU particles include the following components: 10-20 parts of polyester diol, 10-20 parts of polyether diol, 10-25 parts of diisocyanate, 3-10 parts of chain extender, 1-3 parts of organosilicon, and 1-3 parts of ultraviolet absorber. The organosilicon is aminopropyl-terminated polydimethylsiloxane; The lubricant A and lubricant B are each independently selected from any one or a combination of at least two of polyethylene wax, zinc stearate, or ethylene bis-stearamide; The D50 particle size of the nano-titanium dioxide is 30~50 nm; The raw materials for preparing the black film layer and the raw materials for preparing the silver film layer each independently include 1 to 3 parts of dispersant.

2. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The number-average molecular weight of the polyester diol is 300-4000.

3. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The polyester diol is selected from any one or a combination of at least two of polybutylene adipate diol, polyethylene adipate diol, or polycaprolactone diol.

4. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The number-average molecular weight of the polyether diol is 400-4000.

5. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The polyether diol is polytetrahydrofuran ether diol and / or polytetramethylene ether diol.

6. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The diisocyanate is an aliphatic diisocyanate.

7. The silver-black dual-color light-blocking film according to claim 6, characterized in that, The diisocyanate is selected from any one or a combination of at least two of 1,6-hexanediisocyanate, 4,4-dicyclohexylmethane diisocyanate or isophorone diisocyanate.

8. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The chain extender is selected from any one or a combination of at least two of 1,2-ethylene glycol, 1,3-propanediol, 1,4-butanediol, or trimethylolpropane.

9. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The ultraviolet absorber is selected from any one or a combination of at least two of the following: UV-326, UV-327, UV-328, UV-329, UV-360, UV-P, UV-234, or UV-1130.

10. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The raw materials for preparing the TPU particles also include 0.04 to 0.1 parts of catalyst.

11. The silver-black dual-color light-blocking film according to claim 10, characterized in that, The catalyst is selected from dibutyltin dilaurate and / or stannous isooctanoate.

12. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The compatibilizer A and compatibilizer B are each independently selected from polyethylene grafted maleic anhydride and / or polypropylene grafted maleic anhydride.

13. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The dispersant is selected from oxidized polyethylene wax.

14. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The raw materials for preparing the black film layer and the raw materials for preparing the silver film layer each independently include 1 to 3 parts of antioxidant.

15. The silver-black dual-color light-blocking film according to claim 14, characterized in that, The antioxidant is selected from any one or a combination of at least two of the following: triphenyl phosphite, triisodecyl phosphite, phenyl diisodecyl phosphite, or dioctyl phosphite.

16. The silver-black dual-color light-blocking film according to claim 1, characterized in that, The thickness of the silver-black dual-color light-blocking film is 0.01~0.04 mm.