KR101656641B1 - Method of preparing Thermoplastic Polyurethane film with patterns - Google Patents

Method of preparing Thermoplastic Polyurethane film with patterns Download PDF

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Publication number
KR101656641B1
KR101656641B1 KR1020160010642A KR20160010642A KR101656641B1 KR 101656641 B1 KR101656641 B1 KR 101656641B1 KR 1020160010642 A KR1020160010642 A KR 1020160010642A KR 20160010642 A KR20160010642 A KR 20160010642A KR 101656641 B1 KR101656641 B1 KR 101656641B1
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South Korea
Prior art keywords
thermoplastic polyurethane
film
present
pattern
layer
Prior art date
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KR1020160010642A
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Korean (ko)
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엄기천
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엄기천
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Priority to KR1020160010642A priority Critical patent/KR101656641B1/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/003—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor characterised by the choice of material
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/08—Coating a former, core or other substrate by spraying or fluidisation, e.g. spraying powder
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/02—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor for making articles of definite length, i.e. discrete articles
    • B29C41/22—Making multilayered or multicoloured articles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C41/00—Shaping by coating a mould, core or other substrate, i.e. by depositing material and stripping-off the shaped article; Apparatus therefor
    • B29C41/34—Component parts, details or accessories; Auxiliary operations
    • B29C41/42—Removing articles from moulds, cores or other substrates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29K—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2023/00—Use of polyalkenes or derivatives thereof as moulding material
    • B29K2023/10—Polymers of propylene
    • B29K2023/12—PP, i.e. polypropylene

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Laminated Bodies (AREA)
  • Synthetic Leather, Interior Materials Or Flexible Sheet Materials (AREA)

Abstract

The present invention relates to a method for preparing a thermoplastic polyurethane film having a concavo-convex pattern transferred to the surface thereof without any separate adhesive layer or pattern layer, and a method for manufacturing a product comprising the film. According to the method of the present invention, it is possible to provide a monolayer polyurethane film, one surface of which has a pattern transferred thereto and the other surface of which can be adhered to an adherent. Therefore, the polyurethane film obtained according to the present invention can be adhered directly to an adherent without any separate adhesive layer even though it has a pattern. The method does not use a T-die compression process but uses a process of dissolving a thermoplastic resin in an agitation tank. Therefore, a pigment or plasticizer may be added to and agitated in the agitation tank to distribute the pigment and plasticizer in a solution. Thus, the color and quality of the film can be controlled with ease. In addition, it is possible to operate an adequate agitation tank even in the case of a small amount to provide high efficiency in preparing a film.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a thermoplastic polyurethane film,

The present invention relates to a process for producing a patterned thermoplastic polyurethane film and a process for producing a product comprising the same, and more particularly, to a process for producing a patterned thermoplastic polyurethane film by thermoplastic polyurethane To a process for producing a film and a process for producing a product containing the same.

The thermoplastic polyurethane (hereinafter referred to as TPU) is very important industrially because of its excellent elastomeric properties and thermoplastic processability. Conventionally, TPU has been used in a wide range of fields such as paints, adhesives, rolls, tubes, and binders for magnetic recording media. In addition, since TPU is superior in low temperature characteristics to other resins, is rich in flexibility, and has good durability, TPU is also widely used as synthetic leather, film, and molding sheet utilizing such characteristics.

Among them, TPU heat-shrinkable sheet is used for automobile handle, skin of automobile instrument panel, bust cup for swimwear or brassiere, keypad of electronic device, trays of electronic parts, air mat, water bed, have.

In recent years, most products such as shoes, handles, and armrests have become increasingly fashionable, and there is a growing demand for forming patterns and shapes on the TPU film used as the skin of these products.

Japanese Patent Laid-Open No. 10-1318137 discloses a method for producing a thermoplastic polyurethane multilayer film capable of forming a pattern through unevenness formed on a first cooling roller without using a release paper. However, since the above-mentioned patent uses the Ti-die system, there is a problem that it is difficult to produce a small amount of the Ti-die system. In addition, the registered patent still has the inconvenience that it must be bonded to an object such as a shoe using hot melt.

The present invention provides a polyurethane film having a single-layer structure in which one side is used as a coating to which a pattern is transferred and another side can be adhered to an object.

The present invention provides a thermoplastic polyurethane film having a pattern formed without using a Tie die extrusion apparatus.

One aspect of the present invention is

Preparing a one-pack type thermoplastic polyurethane solution;

Applying a one-pack type thermoplastic polyurethane solution onto a release paper on which a transfer pattern of concavo-convex structure is formed;

A drying step of applying heat to evaporate the solvent of the thermoplastic polyurethane solution; And

And peeling the release paper, wherein the pattern is formed on the surface of the thermoplastic polyurethane film.

In another aspect,

Preparing a one-pack type thermoplastic polyurethane solution;

Applying a one-pack type thermoplastic polyurethane solution onto a release paper on which a transfer pattern of concavo-convex structure is formed;

Forming a polyurethane layer by applying heat to evaporate the solvent of the thermoplastic polyurethane solution;

Pressing the polyurethane layer surface of the release paper onto a coated product formed of a polymer resin; And

Peeling the release paper,

Wherein the pressing step involves a method of manufacturing a product coated with a patterned thermoplastic polyurethane film wherein the temperature of the coated product is maintained at 150 to 180 ° C.

According to the manufacturing method of the present invention, it is possible to provide a polyurethane film having a single-layer structure in which a pattern is transferred on one side and the other side can be adhered to an object. Therefore, the polyurethane film produced by the present invention can be attached directly to an object with a pattern, without a separate adhesive layer.

The present invention uses a method of dissolving a thermoplastic resin in a stirring tank without using a T-die compression method. Therefore, pigments or plasticizers can be added to the agitating tank and agitated, so that pigments and plasticizers can be uniformly distributed in the solution, which is advantageous in controlling the color and performance of the film. Further, the present invention is effective in producing a film because it can operate an appropriate stirring tank even in a small amount.

1 shows a method for producing a thermoplastic polyurethane film of the present invention.
2 is a process diagram for producing a single layer thermoplastic polyurethane film by a solution process.
Fig. 3 shows a process for producing a product to which the polyurethane film of the present invention is adhered.
4 is a cross-sectional view of a product coated with a patterned thermoplastic polyurethane film produced according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear. In addition, the terms described below are defined in consideration of the functions of the present invention, which may vary depending on the intention of the user, the operator, or the custom. Therefore, the definition should be based on the contents throughout this specification.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 illustrates a method of making the inventive synthetic leather. Referring to FIG. 1, the present invention includes a solution preparation step, a coating step, a drying step and a peeling step.

In the step of preparing the one-pack type thermoplastic polyurethane solution, 20 to 50% by weight, preferably 25 to 35% by weight, of the thermoplastic polyurethane chip may be dissolved and stirred in DMF (dimethylformamide) as a solvent. The stirring may be performed by mixing the thermoplastic polyurethane chips with the solvent at a temperature of 90 ° C to 100 ° C at 5000 to 8000rpm.

The melting point of the thermoplastic polyurethane chip is 220-240 ° C and the Shore hardness A is 55-95.

The thermoplastic polyurethane chip can be used in an amount of 20 to 50% by weight, preferably 25 to 35% by weight, of the entire solution, even if the thermoplastic polyurethane is difficult to melt or dissolve when the weight exceeds 50% It may be difficult to control the thickness of the thermoplastic polyurethane layer suitable for the object product. In addition, when the weight is less than the above-mentioned range, the viscosity is low, and thus it is difficult to form the thermoplastic polyurethane solution layer.

The thermoplastic urethane solution may have a viscosity of 30,000 to 100,000 cps. It may be difficult to form the layer and control the thickness when the viscosity is out of the above range.

A plasticizer such as glycerin may be added to the thermoplastic urethane solution within 5% by weight. The plasticizer can increase the elasticity of the polyurethane film.

Further, the one-part type thermoplastic polyurethane solution can add a predetermined amount of dye. The coloring matter may be mixed with 10-25 wt% of the thermoplastic polyurethane chip.

In the present invention, the pigment is not coated on the surface of the polyurethane layer but is uniformly dispersed in the polyurethane layer, so that the discoloration phenomenon over time can be prevented.

The applying step is a step of applying a one-pack type thermoplastic polyurethane solution layer 20 onto a release paper 10 having a predetermined shape 11 formed by a concavo-convex structure. Referring to FIG. 1, a pattern or pattern of a predetermined shape may be formed on the release paper in a concave-convex structure. That is, on the surface of the release paper, a specific pattern or pattern due to the convex portion may be formed.

The one-pack type thermoplastic polyurethane solution may be applied in a range of 30 to 500 mu m. Since the coating layer formed of the thermoplastic polyurethane solution of the present invention is used as a coating for transferring patterns on one side and as an adhesion region for adhering to the other side on the other side, it is preferable that the thickness range is satisfied.

In the applying step, the thermoplastic polyurethane solution penetrates into the concave portion on the mold release paper. Therefore, when the solvent is evaporated through the drying process as described later, the thermoplastic polyurethane layer transferred with the pattern corresponding to the convex pattern, Can be obtained.

As shown in FIG. 2, the thermoplastic polyurethane solution can be pressed by using a pressing roller at the same time as the application.

The drying step is a step of applying heat to evaporate the solvent of the thermoplastic polyurethane solution. For example, the drying step may pass the thermoplastic film layer at a rate of 10 to 20 m / min into a chamber at 100 to 150 ° C. Through the drying step, the solvent of the thermoplastic polyurethane solution is completely removed and only the polyurethane remains to form a layer. The thickness of the solvent-removed thermoplastic polyurethane layer may range from 10 to 300 탆, preferably from 20 to 200 탆.

The peeling step is a step of removing the release paper 10 from the thermoplastic polyurethane layer 20. The release paper can be easily removed and the thermoplastic polyurethane layer from which the release paper has been removed has a pattern or pattern 21 protruding from the surface.

2, the present invention employs a method of dissolving a thermoplastic resin in a stirring tank A without using a T-die compression method. Therefore, pigments and plasticizers can be evenly distributed in the solution by adding a dye or a plasticizer to the stirring tank, which is advantageous for controlling the color or performance of the film. Further, the present invention is effective in producing a film because it can operate an appropriate stirring tank even in a small amount.

Referring to Fig. 2, the apparatus for producing polyurethane of the present invention may include a stirring tank A, a conveying device B, and a heating portion C. The apparatus includes a distribution section A1 for applying the stirred solution 20 onto the release paper 10 of the transfer section and a compression roller B1 for forming a film layer of a desired thickness located at the rear end of the distribution section.

The heater (C) is equipped with a heater so that heat of 100 to 150 ° C is applied to the polyurethane solution film layer.

In another aspect, the invention relates to a method of making a product coated with a patterned thermoplastic polyurethane film.

Referring to FIG. 3, it includes a solution preparation step, an application step, a polyurethane layer formation step, a compression step and a peeling step.

The foregoing solution preparation step, application step, polyurethane layer formation and peeling step can be referred to above.

The pressing step is a step of pressing the thermoplastic polyurethane film layer 20 formed on the release paper 10 onto a coated product made of a polymer resin. The coated product may be a textile fabric, an automobile handle manufactured by injection, a skin of a car instrument panel, a chair armrest, a tray of an electronic component, an air mat, a water bed, various protective cases, and the like.

The pressing step may be performed by pressing the thermoplastic film layer 20 under a condition that the temperature of the coated product is maintained at 150 to 180 ° C.

The method of manufacturing a product coated with the thermoplastic polyurethane film of the present invention does not require the use of a separate adhesive between the coated product and the patterned thermoplastic polyurethane layer, thereby reducing cost and process time. Particularly, since the present invention does not use a thermosetting resin as an adhesive, it takes a long time for adhesion to shorten within a few minutes. In addition, since the specific pattern of the release paper is transferred in the manufacturing process (coating, drying, etc.), the present invention does not require a separate pattern transfer process.

4 is a cross-sectional view of a product coated with a patterned thermoplastic polyurethane film produced according to the present invention. Referring to FIG. 4, the product of the present invention includes a coated product 30 and a skin layer (surface layer) 20 attached thereto. As described above, the skin layer 20 is a thermoplastic polyurethane layer, one surface of which forms an adhesion region bonded to the fabric, and the opposite surface of which has a predetermined shape 21 such as a pattern, . The predetermined shape 21 may be transferred from the shape 11 on the release paper 10. The thickness of the skin layer may be 10 to 300 mu m including the shape 21 formed by the unevenness.

Unlike conventional synthetic leather or products, the product of the present invention does not have an adhesive layer separately, and since the pattern of the release paper is transferred during the film production process, the durability of the pattern is also excellent.

Example  One

A release paper formed by projecting a lattice pattern was prepared.

75 wt% of DMF and thermoplastic polyurethane chips were placed in DMF and heated at 90 degrees for 4 hours to prepare 1,000 kg of a thermoplastic polyurethane solution (75 wt% of DMF and 25 wt% of thermoplastic polyurethane chips).

The thermoplastic polyurethane solution was coated on the release paper formed with protruding lattice patterns to a thickness of 200 mu m and then pressed with a roller. The release paper on which the polyurethane layer was formed was passed through a chamber at 120 캜 at a speed of 15 m / min to evaporate the residual solvent. Then, after drying at room temperature for a predetermined time, the release paper was peeled off.

Example  2

The thermoplastic polyurethane film (including releasing paper) prepared in Example 1 was laminated on a plastic molded article (armrest) heated to 170 DEG C for about 3 minutes. After the injection product was cooled, the release paper was peeled off.

It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in an illustrative rather than a restrictive sense. Therefore, the scope of the present invention is not limited to the above-described embodiments, but should be construed to include various embodiments within the scope of the claims and equivalents thereof.

Claims (5)

delete delete delete Mixing 25 to 50% by weight of a thermoplastic polyurethane chip with DMF (dimethylformamide) as a solvent at a temperature of 90 to 100 ° C at a temperature of 5000 to 8000 rpm to prepare a one-pack type thermoplastic polyurethane solution;
Applying a one-pack type thermoplastic polyurethane solution to a release paper on which a transfer pattern of concavo-convex structure is formed in a thickness of 30 to 500 탆;
Applying heat to form a polyurethane layer by evaporating the solvent of the thermoplastic polyurethane solution; And
Pressing the surface of the polyurethane layer onto a coated product formed of a polymer resin;
Peeling the release paper,
Wherein the viscosity of the one-pack type thermoplastic polyurethane solution is 30,000 to 100,000 cps, and the temperature of the coated product is maintained at 150 to 180 ° C. Gt;

delete
KR1020160010642A 2016-01-28 2016-01-28 Method of preparing Thermoplastic Polyurethane film with patterns KR101656641B1 (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR102280585B1 (en) * 2021-01-15 2021-07-23 씰테크 주식회사 Release film for semiconductor package and method of manufacturing the same
KR20220033278A (en) * 2020-09-09 2022-03-16 엄기천 Method for producign thermoplastic polyurethane film and screen protection film for mobile phone including the thermoplastic polyurethane film
WO2022103143A1 (en) * 2020-11-10 2022-05-19 (주)엘엑스하우시스 Transfer film and manufacturing method therefor

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970062179A (en) * 1996-02-27 1997-09-12 이연기 Manufacturing method of polyurethane synthetic leather
KR20080103695A (en) * 2007-05-25 2008-11-28 코오롱글로텍주식회사 A method for manufacturing of an moisture-permeable and water-proof polyurethane film printed with embo patterns
KR101399948B1 (en) * 2014-02-04 2014-05-29 하영문 Sythetic lether and method thereof

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR970062179A (en) * 1996-02-27 1997-09-12 이연기 Manufacturing method of polyurethane synthetic leather
KR20080103695A (en) * 2007-05-25 2008-11-28 코오롱글로텍주식회사 A method for manufacturing of an moisture-permeable and water-proof polyurethane film printed with embo patterns
KR101399948B1 (en) * 2014-02-04 2014-05-29 하영문 Sythetic lether and method thereof

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20220033278A (en) * 2020-09-09 2022-03-16 엄기천 Method for producign thermoplastic polyurethane film and screen protection film for mobile phone including the thermoplastic polyurethane film
KR102406427B1 (en) * 2020-09-09 2022-06-07 엄기천 Method for producign thermoplastic polyurethane film and screen protection film for mobile phone including the thermoplastic polyurethane film
WO2022103143A1 (en) * 2020-11-10 2022-05-19 (주)엘엑스하우시스 Transfer film and manufacturing method therefor
KR102280585B1 (en) * 2021-01-15 2021-07-23 씰테크 주식회사 Release film for semiconductor package and method of manufacturing the same
WO2022154204A1 (en) * 2021-01-15 2022-07-21 씰테크 주식회사 Release film for semiconductor package and manufacturing method therefor
CN115461222A (en) * 2021-01-15 2022-12-09 希利特株式会社 Release film for semiconductor packaging and preparation method thereof
CN115461222B (en) * 2021-01-15 2024-07-02 希利特株式会社 Release film for semiconductor packaging and preparation method thereof

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