CN110843284B - Preparation method and application of gradient metal-like TPU (thermoplastic polyurethane) film - Google Patents

Preparation method and application of gradient metal-like TPU (thermoplastic polyurethane) film Download PDF

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Publication number
CN110843284B
CN110843284B CN201910876094.1A CN201910876094A CN110843284B CN 110843284 B CN110843284 B CN 110843284B CN 201910876094 A CN201910876094 A CN 201910876094A CN 110843284 B CN110843284 B CN 110843284B
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layer
parts
silver
color
tpu film
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CN110843284A (en
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徐咏春
郑钟强
莫丽娟
谢晓红
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Guangdong Yuxin New Materials Co.,Ltd.
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Guangzhou Yuxin New Material Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B15/00—Layered products comprising a layer of metal
    • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B32B15/095—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin comprising polyurethanes
    • A—HUMAN NECESSITIES
    • A43—FOOTWEAR
    • A43D—MACHINES, TOOLS, EQUIPMENT OR METHODS FOR MANUFACTURING OR REPAIRING FOOTWEAR
    • A43D8/00—Machines for cutting, ornamenting, marking or otherwise working up shoe part blanks
    • A43D8/02—Cutting-out
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/40—Layered products comprising a layer of synthetic resin comprising polyurethanes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
    • B32B37/06—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the heating method
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/10—Removing layers, or parts of layers, mechanically or chemically
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00—Ancillary operations in connection with laminating processes
    • B32B38/14—Printing or colouring
    • B32B38/145—Printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/08—Interconnection of layers by mechanical means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/12—Stencil printing; Silk-screen printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/14—Multicolour printing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/22—Metallic printing; Printing with powdered inks
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M1/00—Inking and printing with a printer's forme
    • B41M1/26—Printing on other surfaces than ordinary paper
    • B41M1/30—Printing on other surfaces than ordinary paper on organic plastics, horn or similar materials
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
    • B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
    • B41M7/00—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock
    • B41M7/009—After-treatment of prints, e.g. heating, irradiating, setting of the ink, protection of the printed stock using thermal means, e.g. infrared radiation, heat
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/03—Printing inks characterised by features other than the chemical nature of the binder
    • C09D11/037—Printing inks characterised by features other than the chemical nature of the binder characterised by the pigment
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D11/00—Inks
    • C09D11/02—Printing inks
    • C09D11/10—Printing inks based on artificial resins
    • C09D11/102—Printing inks based on artificial resins containing macromolecular compounds obtained by reactions other than those only involving unsaturated carbon-to-carbon bonds
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D175/00—Coating compositions based on polyureas or polyurethanes; Coating compositions based on derivatives of such polymers
    • C09D175/04—Polyurethanes
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09D—COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR
    • C09D5/00—Coating compositions, e.g. paints, varnishes or lacquers, characterised by their physical nature or the effects produced; Filling pastes
    • C09D5/38—Paints containing free metal not provided for above in groups C09D5/00 - C09D5/36
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/402—Coloured
    • B32B2307/404—Multi-coloured
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/406—Bright, glossy, shiny surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2437/00—Clothing
    • B32B2437/02—Gloves, shoes
    • C—CHEMISTRY; METALLURGY
    • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
    • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
    • C08K3/00—Use of inorganic substances as compounding ingredients
    • C08K3/02—Elements
    • C08K3/08—Metals
    • C08K2003/0806—Silver

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Organic Chemistry (AREA)
  • Wood Science & Technology (AREA)
  • Materials Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Mechanical Engineering (AREA)
  • Toxicology (AREA)
  • Thermal Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Health & Medical Sciences (AREA)
  • Physics & Mathematics (AREA)
  • General Chemical & Material Sciences (AREA)
  • Inks, Pencil-Leads, Or Crayons (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

The invention discloses a preparation method of a gradually-changed metal-feeling TPU (thermoplastic polyurethane) film, and relates to a material preparation method. The invention also discloses a scheme for applying the metallic TPU film with the gradually changed color prepared by the preparation method to soles, so that the soles have more visual impact and the products are more durable.

Description

Preparation method and application of gradually-changed metal-feeling TPU film
Technical Field
The invention relates to a material preparation method, in particular to a preparation method and application of a gradually-changed metal-feeling TPU film.
Background
The TPU film is prepared by special processes such as calendering, tape casting, film blowing, coating and the like on the basis of TPU granules.
TPU (thermoplastic polyurethanes) is becoming increasingly popular because of its superior properties and environmental protection concept. At present, TPU can become a substitute for PVC in places where PVC is used.
The TPU not only has excellent characteristics of high tension, high tensile force, toughness and aging resistance, but also is a mature environment-friendly material. It has extremely wide application on sports shoes: the sole and the vamp are provided with trademark decorations, air bags, air cushions, oil pockets and the like.
At present, in order to attract customers, manufacturers print gradient colors on TPU films through ink-jet printing, and the color layers of the films prepared by the method are cracked after the films are applied to products and are subjected to plastic uptake or certain specific process treatment, so that the visual effect is poor due to discontinuous colors. In addition, manufacturers can also manually spray paint on the TPU film directly, the color layer is exposed on the surface of the TPU film, and after the TPU film is applied to products, the TPU film is extremely easy to scrape off along with the lapse of time, and the production efficiency is low.
Disclosure of Invention
In order to overcome the defects of the prior art, one of the purposes of the invention is to provide a preparation method of a gradually-changed metal-feeling TPU film, which can ensure that the TPU film has both metallic luster and color luster, has long retention time and has a color layer which is not easy to break.
The second purpose of the present invention is to provide a sole which has metallic luster and color luster, has long lasting time, and is not easy to break the color layer.
One of the purposes of the invention is realized by adopting the following technical scheme:
a preparation method of a gradient-color metallic TPU film comprises the following steps:
preparing a TPU natural color film: respectively preparing a first TPU film and a second TPU film by adopting a tape casting method or a calendering method molding process;
silver layer coating and scraping: coating and scraping the silver paste on release paper, and drying to obtain a silver layer, wherein the drying temperature is 100-160 ℃;
a step of laminating a metal texture layer: heating and bonding the first TPU film and the silver layer at the bonding temperature of 100-160 ℃ to obtain a metal texture layer, and peeling the silver layer from the release paper after bonding the metal texture layer;
and (3) a progressive color layer printing step: printing at least two colors of printing ink on the second TPU film to prepare a progressive color layer, wherein the printing ink with different colors is gradually transited; after printing the ink of each color, drying the ink of the color at the temperature of 110-160 ℃, and continuously printing the ink of the other color;
forming and fitting: and heating and jointing the surface of the metal texture layer with the silver layer and the surface of the progressive color layer printed with the printing ink at the temperature of 110-160 ℃ to obtain the gradually-changed metal texture TPU film.
Further, in the silver layer coating and scraping step, a layer of silver paste is firstly coated and scraped on the release paper, the silver paste is dried to form a first silver layer, a layer of silver paste is further coated and scraped on the surface of the first silver layer, and the silver paste is dried again to form a second silver layer.
Further, the thickness of the first silver layer is 0.01mm-0.02 mm; the thickness of the second silver layer is 0.01mm-0.015 mm.
Further, the silver paste comprises the following components in parts by mass:
Figure GDA0002322778730000021
Figure GDA0002322778730000031
further, the silver paste preparation comprises the following steps:
s1, pouring 52 parts of PU and 70 parts of solvent into a container, and mixing and stirring;
s2, pouring 21 parts of hot melt adhesive into the container and continuously stirring;
s3, mixing 0.5-1 part of silver powder and 10 parts of solvent to prepare slurry, and adding the slurry into a container;
s4, washing the silver powder on the side wall of the container with the remaining 6 to 6.5 parts of the solvent, and then pouring it into the container together with the washed silver powder.
Further, the silver powder is 600 mesh.
Further, the step of progressive color printing comprises the steps of:
s1, printing ink of a first color on the surface of the second TPU film from the first end to the second end of the second TPU film for 3 times by using a progressive color screen plate, and drying;
s2, printing ink of a second color from the second end to the first end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 1 time, and drying;
s3, printing ink of the first color from the first end to the second end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 3 times, and drying;
and S4, printing the second color ink on the upper color layer surface from the second end to the first end of the second TPU film by using a progressive color screen plate for 2 times, and then drying.
S5, printing a layer of white ink on the surface of the upper color layer, and drying.
Further, the ink includes silver ink, blue ink, red ink;
the silver ink comprises the following components in parts by mass:
1 part of silver powder;
15 parts of PU;
15 parts of DMF;
the blue ink comprises the following components in parts by mass:
Figure GDA0002322778730000041
the red ink comprises the following components in parts by mass:
2.65 parts of fluorescent peach toner;
2 parts of fluorescent orange powder;
and 3.5 parts of DMF.
Further, the silver powder was 1000 mesh.
The second purpose of the invention is realized by adopting the following technical scheme:
use of a gradient metallic TPU film as described above in a shoe sole.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the gradient metal-feeling TPU film, the first TPU film and the second TPU film are respectively arranged on the two surfaces of the metal-feeling layer with the metal luster and the gradient color layer with the color luster for protection, so that the metal luster and the color luster can be lasting and are not easy to scrape off.
2. The whole film is internally provided with the metal texture layer and the progressive color layer which are overlapped, the surfaces of the first TPU film and the second TPU film are transparent or semitransparent, the progressive color layer and the metal texture layer can be alternately shown, and the film has more visual impact when being applied to products, particularly soles.
3. The printing ink is printed on the second TPU film by a printing method, and after the printing ink is applied to products, particularly soles, progressive color layers of the products do not generate cracks after being subjected to plastic suction or specific process treatment, the color tinting degree is high, and the durability of the gradually-discolored metal-feeling TPU film is improved.
Detailed Description
The present invention is further described below with reference to specific embodiments, and it should be noted that, without conflict, various embodiments or technical features described below may be arbitrarily combined to form a new embodiment.
In order to ensure that the TPU film has metallic light color and color luster visually and the metal layer and the color layer are not easy to tear and fall off, the invention provides a preparation method of a gradually-changed metallic TPU film, which comprises the following steps:
preparing a TPU natural color film: respectively preparing a first TPU film and a second TPU film by adopting a tape casting method or a calendering method, wherein the thicknesses of the first TPU film and the second TPU film are respectively 0.14mm and 0.15mm, so that the total thickness of the manufactured product is ensured to be within the standard requirement;
silver layer coating and scraping: coating silver paste on release paper, drying to obtain a silver layer, wherein the drying temperature is 100-160 ℃, the silver paste can be coated and scraped once or repeatedly, and the silver layer coated and scraped at the last time needs to be dried before each coating and scraping;
a step of laminating a metal texture layer: heating the first TPU film and the silver layer, wherein the bonding temperature is 100-160 ℃, in the embodiment, the bonding heating temperature is 160 ℃, and the silver layer and the release paper are peeled off after the metal texture layer is bonded;
and (3) a progressive color layer printing step: printing at least two colors of printing ink on the second TPU film to prepare a progressive color layer, wherein the printing ink with different colors is gradually transited; after printing each color of ink, drying the ink of the color at the temperature of 110-160 ℃, and continuously printing the ink of the other color, wherein the thickness of the progressive layer is ensured to be between 0.33 and 0.35 mm;
forming and laminating: and heating and bonding the side of the metal texture layer with the silver layer and the side of the progressive color layer printed with the printing ink at the temperature of 110-160 ℃, wherein the bonding and heating temperature is 150 ℃ in the example, so as to obtain the gradient metal texture TPU film.
Further, in the silver layer coating and scraping step, the silver paste is coated and scraped for the second time;
firstly, coating a silver paste layer on a release paper for the first time, drying to form a first silver layer, coating a silver paste layer on the surface of the first silver layer, and drying again to form a second silver layer, wherein in the example, the drying temperature of the first silver layer coated and scraped for the first time is 100 ℃, and the drying temperature of the second silver layer coated and scraped for the second time is 120 ℃.
The thickness of the first silver layer is 0.01mm-0.02 mm; the thickness of the second silver layer is 0.01mm-0.015 mm.
The silver paste comprises the following components in parts by mass:
Figure GDA0002322778730000061
the silver paste preparation method comprises the following steps:
s1, pouring 52 parts of PU and 70 parts of solvent into a container, and mixing and stirring;
s2, pouring 21 parts of hot melt adhesive into the container and continuously stirring;
s3, mixing 0.5-1 part of silver powder and 10 parts of solvent to prepare slurry, and adding the slurry into a container;
s4, washing the silver powder on the side wall of the container with the remaining 6 to 6.5 parts of the solvent, and then pouring it into the container together with the washed silver powder.
The silver powder is 600 meshes.
In this example, the first silver layer comprises, by mass, 1 part of silver powder, 52 parts of PU, 86 parts of solvent and 21 parts of hot melt adhesive;
the second silver layer comprises, by mass, 0.5 part of silver powder, 52 parts of PU, 86.5 parts of a solvent and 21 parts of a hot melt adhesive.
Scraping is conducted twice, and silver paste components scraped twice are different, so that firmness among the first TPU film, the first silver layer and the second silver layer can be improved under the condition that a metal effect is not changed.
Specifically, the step of progressive color printing comprises the steps of:
s1, printing ink of a first color on the surface of the second TPU film from the first end to the second end of the second TPU film for 3 times by using a progressive color screen plate, and drying;
s2, printing ink of a second color from the second end to the first end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 1 time, and drying;
s3, printing ink of the first color from the first end to the second end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 3 times, and drying;
and S4, printing the second color ink on the upper color layer surface from the second end to the first end of the second TPU film by using a progressive color screen plate for 2 times, and then drying.
S5, printing a layer of white ink on the surface of the upper color layer, and drying.
In this example, the drying temperature was 120 ℃.
Through the multiple printing of the steps S1-S4, the ink dropping amount of the ink can be ensured, so that the color gloss of the progressive color layer on the second TPU film is better.
And S5 is to print a layer of white ink on the printed gradient color surface, so as to make the printed surface heated uniformly, and because of the difference of color and depth, the heat absorption capacity will be different, and on the premise of not ensuring the uniform heating, the first TPU film may have a deformation problem in the subsequent process.
In this example, the ink includes, but is not limited to, silver ink, blue ink, red ink;
the silver ink comprises the following components in parts by mass:
1 part of silver powder;
15 parts of PU;
15 parts of DMF;
the blue ink comprises the following components in parts by mass:
Figure GDA0002322778730000081
the red ink comprises the following components in parts by mass:
2.65 parts of fluorescent peach toner;
2 parts of fluorescent orange powder;
and 3.5 parts of DMF.
The silver powder is 1000 meshes, and because the printing ink is printed on the second TPU film through a screen with dense meshes, the silver powder with the finer 1000 meshes is needed, and the scraping can be used for reducing the production cost by using 600 meshes with larger particles.
The invention also discloses an application of the gradually-changed metal-feeling TPU film prepared by the preparation method of the gradually-changed metal-feeling TPU film on a sole.
The first TPU film and the second TPU film have the effect of protecting the metal texture layer and the progressive color layer, and the printing ink printed on the second TPU film by the printing method can also prevent the progressive color layer from cracking, so that the metal texture layer and the progressive color layer are not easy to scrape off, and particularly when the TPU film is applied to soles, the visual impact of products can be improved, and the durability of the products can be ensured.
The above embodiments are only preferred embodiments of the present invention, and the protection scope of the present invention is not limited thereby, and any insubstantial changes and substitutions made by those skilled in the art based on the present invention are within the protection scope of the present invention.

Claims (6)

1. A preparation method of a gradually-changed metal-feeling TPU film is characterized by comprising the following steps:
preparing a TPU natural color film: respectively preparing a first TPU film and a second TPU film by adopting a tape casting method or a calendering method molding process;
silver layer coating and scraping: coating silver paste on release paper, and drying to obtain a silver layer; the silver paste is coated and scraped for the second time, firstly, a layer of silver paste is coated and scraped for the first time on release paper, a first silver layer is formed by drying, then a layer of silver paste is coated and scraped on the surface of the first silver layer, and a second silver layer is formed by drying again, wherein the drying temperature of the first silver layer coated and scraped for the first time is 100 ℃, and the drying temperature of the second silver layer coated and scraped for the second time is 120 ℃; the thickness of the first silver layer is 0.01mm-0.02 mm; the thickness of the second silver layer is 0.01mm-0.015 mm; the first silver layer comprises 1 part of silver powder, 52 parts of PU, 86 parts of solvent and 21 parts of hot melt adhesive in parts by mass; the second silver layer comprises 0.5 part of silver powder, 52 parts of PU, 86.5 parts of solvent and 21 parts of hot melt adhesive in parts by mass;
a step of laminating the metal texture layer: heating and bonding the first TPU film and the silver layer at the bonding temperature of 100-160 ℃ to obtain a metal texture layer; stripping the silver layer from the release paper after the lamination;
and (3) a progressive color layer printing step: printing ink with two colors on the second TPU film to prepare a progressive color layer, wherein the ink with different colors is gradually transited; after printing the ink of each color, drying the ink of the color at the temperature of 110-160 ℃, and then continuously printing the ink of the other color;
forming and fitting: heating and attaching the surface of the metal texture layer with the silver layer and the surface of the progressive color layer printed with the printing ink at the temperature of 110-160 ℃ to obtain a gradient metal texture TPU film;
wherein the step of progressive color layer printing comprises the steps of:
s1, printing ink of a first color on the surface of the second TPU film from the first end to the second end of the second TPU film for 3 times by using a progressive color screen plate, and drying;
s2, printing ink of a second color from the second end to the first end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 1 time, and drying;
s3, printing ink of the first color from the first end to the second end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 3 times, and drying;
s4, printing ink of a second color from the second end to the first end of the second TPU film on the surface of the upper color layer by using a progressive color screen plate for 2 times, and then drying;
s5, printing a layer of white ink on the surface of the upper color layer, and drying.
2. A method for preparing the gradient metallic TPU film of claim 1 characterized by: the silver paste preparation method comprises the following steps:
s1, pouring 52 parts of PU and 70 parts of solvent into a container, and mixing and stirring;
s2, pouring 21 parts of hot melt adhesive into the container and continuously stirring;
s3, mixing 0.5 part or 1 part of silver powder with 10 parts of solvent, preparing into slurry and adding into a container;
s4, washing the silver powder on the side wall of the container with the remaining 6 parts or 6.5 parts of the solvent, and then pouring it into the container together with the washed silver powder.
3. A process for preparing a gradient color metallic TPU film as set forth in claim 1, characterized by: the silver powder is 600 meshes.
4. A method for preparing the gradient metallic TPU film of claim 1 characterized by: the ink comprises silver ink, blue ink and red ink;
the silver ink comprises the following components in parts by mass:
1 part of silver powder;
15 parts of PU;
15 parts of DMF;
the blue ink comprises the following components in parts by mass:
Figure FDA0003544860730000021
Figure FDA0003544860730000031
the red ink comprises the following components in parts by mass:
2.65 parts of fluorescent peach toner;
2 parts of fluorescent orange powder;
and 3.5 parts of DMF.
5. The process for producing the gradually changing metallic TPU film of claim 4, wherein: the silver powder is 1000 meshes.
6. Use of a gradient metallic feel TPU film as claimed in any one of claims 1 to 5 in shoe soles.
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