KR101539429B1 - Reflecting film and a method of manufacturing the form-retaining - Google Patents

Abstract

The present invention relates to a reflective film formed by molding polypropylene or polyethyleneterephtalate, which is excellent in shape restoring force, on a flat reflective film, or an alloy made of an alloy excellent in shape retention or an adherend made of metal, A reflective sheet for improving the reflection effect of recently developed and used household appliances such as an LCD TV or a computer monitor by maintaining the shape of the reflective film in accordance with a shape obtained by deforming the adherend made into a desired shape, The present invention relates to a method for maintaining a shape of a reflective film which is easy to apply to a reflector for illumination, a structure thereof, and an adhesive used therefor. More particularly, the present invention relates to a reflective film for producing a reflective film using polypropylene or polyethyleneterephtalate as a main material Production phase; and alloy or gold made of thin foil A method for manufacturing an optical information recording medium, comprising the steps of: preparing an adhesive agent made of an alloy or a metal material to produce a snug alloyed agent; and an adhesive agent producing an adhesive agent for adhering the reflective film to the alloy or metal- A step of adhering an adherend made of an alloy or a metal or an alloy or an alloy made of a metal to an adherend made of a metal or the like; and a step of adhering an adherend made of a polypropylene or a polyethyleneterephtalate An adhesive layer having a thickness of 80 占 퐉 or less is formed between a reflective film having a thickness of 550 占 퐉 or less and an alloy made of a thin foil or a metal material having a thickness of 150 占 퐉 or less, Holding a reflective film having a thickness of 600 占 퐉 or less by heating and pressing with a hot press and molding the reflective film adhered to the adherend made of an alloy or metal to bend and maintain the shape; And the molded film is kept at a radius of curvature R of 50 mm or less. The adhesive used here is dicumyl peroxide (DCP, 98%) in powder of polypropylene (PP, Hyosung) , 5 wt% of vinyltriethoxysilane (VTEOS, 97%, manufactured by Aldrich) for 20 minutes, mixing the compounded raw materials in a mixing chamber, , And 0.2 wt% of an antioxidant Irganox 225 (manufactured by Ciba-Geigy) was added at a stirring speed of 60 rpm and a stirring temperature of 190 캜 for 3 minutes. The mixture was further stirred for 5 minutes to perform a grafting reaction for a total of 8 minutes The obtained polymeric polymer (pp-g-VT EOS and polypropylene were blended at 5: 5 to obtain a polymer blend. The polymer blend was mixed with 3 wt% of filler CaCO3 (99.99% Sigma Aldrich) And 0.1 wt% of an inhibitor Irganox 225 (Ciba-Geigy) was compounded for 20 minutes to prepare an adhesive, or the adhesive thus prepared was extruded at 220 캜 to produce an adhesive film having a thickness of 80 탆 or less.

Description

BACKGROUND OF THE INVENTION Field of the Invention [0001] The present invention relates to a reflective film,

The present invention relates to a shape-retaining reflective film of a reflective film, a method of manufacturing the same, and an adhesive and a shape retaining method used therefor. More particularly, the present invention relates to a reflective film comprising polypropylene or polyethyleneterephtalate, By attaching an alloy made of an alloy having an excellent shape retention capability or an adherend made of a metal to a flat reflective film formed by molding an alloy or a metallic material into a desired shape to maintain the shape of the reflective film A shape-retaining reflective film which is improved in the reflection effect of a reflective film used in a display field such as an LCD TV or a computer monitor, which is recently developed and used, and which is easy to apply to a reflective plate for an infinite use, and a manufacturing method thereof .

As the industry developed, home appliances such as TVs and computers were invented and distributed as a medium for communicating information to a large number of people. Such home appliances display a clear and clean image screen by displaying light-based video images And the use of such reflective films has been expanded. Now, research is being carried out to replace reflectors of household appliances as well as reflectors of illumination lamps with reflective films. The patent literature of the prior art that has been developed up to now is as follows.

The patent application No. 10-2006-0009464 (2006.02.01) is an improvement invention of a registered patent (Registration No. 10-0318244) as a patented invention, in which a coating layer is formed of a thermoplastic resin (primer) solution on the backside of a polyester film, (Primer) to form a coating layer, and then an acrylic adhesive layer is formed thereon. In a conventional reflective film for a fluorescent lamp reflector, the surface of the polyester film is coated with a urethane acrylic monomer Or an oligomer in a solvent to form a smooth surface, irradiating UV rays, and polymerizing and curing the coating to form a coating layer having a pencil hardness of 2 or more. The patent application No. 10-2010-0039645 (Apr. 28, 2010) relates to a retroreflective sheet, comprising: a carrier sheet; A cover film disposed on the surface side of the carrier sheet and pressed; A pressure-sensitive adhesive layer formed between the carrier sheet and the cover film; A reflective layer interposed between the pressure-sensitive adhesive layer and a plurality of glass bead layers sandwiched between the carrier sheet and the reflective layer to refract light; Further comprising a mesh layer between the cover film and the pressure-sensitive adhesive layer, the mesh layer being impregnated with the reflective layer and the glass bead layer; Not only the convenience of the separating process of the reflective sheet is improved, but also the ventilation property is improved and the utilization of the reflective sheet is widened, thereby diversifying and upgrading the product. Patent Application No. 1990-0017500 (Nov. 15, 1990) filed a patent application for a reflective sheet made of a PET resin film having a high hardness even in a synthetic resin, unlike a method in which a PET resin film is adhered after an aluminum- (Wrapping synthetic resin) film is bonded by post treatment to protect the aluminum deposition reflective layer. Also, the manufacturing process is simple and the production cost is low, so that the productivity is increased. Also, since the periphery of the reflection plate is wrapped by the transparent wrap, So that it can be supplemented.

However, the reflection film used in the display and illumination fields up to now has a flat reflective film formed by molding polypropylene or polyethyleneterephtalate as its main material without any modification, In detail, the reflective film is processed by processing such as punching or half-punching by a dotted line on the reflective film, folding it in the same manner as folding of origami, or attaching double-sided tape to both ends The reflective film was used in three dimensions by fixing it to the instrument. The flat light reflecting film formed by using polypropylene or polyethyleneterephtalate as the main material was not used for the illumination light.

However, it is difficult to form various angles or curved shapes of the reflective film by using a flat reflective film formed by molding polypropylene or polyethyleneterephtalate as a main material, Even if the reflective film itself was made to take the shape of a curved line, it was difficult to maintain the shape and the radius of curvature of the reflective film due to the heat generated from the display or the lighting device due to the contraction, expansion and thermal deformation of the reflective film. .

The present invention relates to a reflective film formed by molding polypropylene or polyethyleneterephtalate as a main material and an alloy or an adherend made of an alloy having an excellent shape retention ability to adhere to the film, A reflection sheet for improving the reflection effect of recently developed and used household appliances such as a TV or a computer monitor by keeping the shape of the reflection film at various angles or curves according to various shapes obtained by deforming the reflector, It is intended to make it easy to apply to reflectors.

In order to achieve the above object, the present invention provides a method for manufacturing a reflective film, comprising the steps of: (a) preparing a reflective film using polypropylene or polyethyleneterephtalate as a main material, (b) producing a reflective film using a thin foil, A step of producing an adhesive agent made of an alloy or a metal material for producing an alloy adherend made of an alloy or a metal, a step of producing an adhesive agent for adhering the reflective film to an alloy or an adherend made of metal, An adherent adherend made of an alloy or a metal to adhere a reflective film to an alloy or an alloy made of an alloy or an adherend made of a metal; and a step of adhering an adherend made of a polypropylene or a polyethyleneterephtalate A thickness of 80 mu m or less is provided between a PP reflection film having a thickness of 150 mu m or less and an alloy made of a thin foil or a metal material and having a thickness of 150 mu m or less, Configuration and the following 150 ℃ Holding a reflective film having a thickness of 600 占 퐉 or less by heating and pressing with a hot press and molding the reflective film adhered to the adherend made of an alloy or metal to bend and maintain the shape; So that the molded film was kept at a curvature radius R value of 50 mm or less.

The adhesive used herein was a polypropylene powder (PP, Hyosung) powder containing 0.1 wt% of dicumyl peroxide (DCP, 98%, Sigma Aldrich), vinyltriethoxysilane (VTEOS, 97%, manufactured by Aldrich) for 20 minutes. The compounded raw materials were put into a mixing chamber and stirred for 3 minutes at a stirring speed of 60 rpm and a stirring temperature of 190 ° C., (Pp-g-VTEOS) and polypropylene obtained by adding 0.2 wt% of Irganox 225 (Ciba-Geigy) and further stirring for 5 minutes for reaction for a total of 8 minutes to obtain a grafting reaction. (Polymer blend) was prepared by blending 3% by weight of a polymer blend with 3 wt% of a filler CaCO3 (99.99% Sigma Aldrich), an antioxidant Irganox 225 (Ciba-Geigy) 0.1 wt% for 20 minutes to prepare an adhesive, Extruding the adhesive prepared as in 220 ℃ to prepare an adhesive film having a thickness of less than 80㎛.

In order to maintain the shape of the reflective film, the present invention is characterized in that an adherend made of an alloy or metal is adhered to maintain the shape of the reflective film and an adherend made of an alloy or metal is molded into a desired shape to maintain the shape of the reflective film, It is a design limit to be used for LED TV and lighting by ensuring the flame retardancy by constituting the alloy made of alloy or metal material as the alloy by overcoming the problems caused by external environmental factors caused by humidity, It is possible to provide a reflective film design of various shapes as well as to overcome the problems described above and also to bond an alloy such as an alloy or a metal material to a flat reflective film molded from polypropylene or polyethyleneterephtalate as a main material So that they are bonded with an adhesive that allows for more complete chemical bonding, With no side effects being separated is a novel invention.

1 is a step-by-step process diagram according to the practice of the present invention;

Hereinafter, the present invention will be described in detail.

First, in implementing the shape-retaining reflective film manufacturing method,

A reflective film production step of fabricating a reflective film using polypropylene or polyethyleneterephtalate as a main material; a producing step of an alloy or metal material made of a thin foil; A step of producing an adhesive for bonding the reflection film and the adhesion material made of an alloy or a metal material; and an adhesion material for bonding an alloy or a metal material to the reflection film using an adhesive, And an adhesive bonding step.

Here, the adhesion step of an alloy or metal material is carried out by placing an adhesive having a thickness of 80 탆 or less on a reflective film having a thickness of 550 탆 or less made of polypropylene or polyethyleneterephtalate as a main material, and applying a thin foil ) Is coated with a hot press at 130 DEG C or lower to obtain a reflective film having a thickness of 760 mu m or less.

A method of holding the shape of the shape-retaining reflective film can be realized by adding a molding step in which the shape of the reflective film adhered to the adherend of the alloy or the metal is maintained by bending and molding the above method. A reflective film having a thickness of 550 μm or less made of polypropylene or polyethyleneterephtalate and an alloy made of a thin foil or a metal material having a thickness of 150 μm or less are adhered with an adhesive The reflective film having a thickness of 760 占 퐉 or less may be bent at an external pressure to deform the film into various shapes to maintain the shape thereof.

Next, a method of manufacturing an adhesive which is important in the practice of the present invention will be described.

0.1 wt% of dicumyl peroxide (DCP, 98%, Sigma Aldrich), vinyltriethoxysilane (VTEOS, 97%) were added to polypropylene powder (PP, Hyosung Co.) powder, 5% by weight of Aldrich) was compounded for 20 minutes, and the compounded raw materials were placed in a mixing chamber. After 3 minutes at a stirring speed of 60 rpm and a stirring temperature of 190 ° C, an antioxidant Irganox 225 (Pp-g-VTEOS) and polypropylene obtained by adding 0.2 wt% of polypropylene (Ciba-Geigy) and further stirring for 5 minutes for a total of 8 minutes to perform a grafting reaction. and then polymer blend was obtained by blending the polymer blend with 3 wt% of a filler CaCO 3 (99.99% Sigma Aldrich) and 0.1 wt% of an antioxidant Irganox 225 (Ciba-Geigy) Followed by compounding for a minute to prepare an adhesive used for producing a reflective film.

When the adhesive thus produced is extruded at 220 캜 and made into an adhesive film having a thickness of 80 탆 or less, it becomes more convenient for practical use.

According to another aspect of the present invention, there is provided a method for maintaining a shape of a reflective film, the method comprising the steps of: (a) preparing an adhesive; (b) applying an adhesive to the reflective film to attach an adherend made of an alloy or metal; (c) molding a reflective film with an adherend made of an alloy or metal to maintain its shape; .

It is preferable that the adhesive in the step of producing the above-described adhesive is composed of a hot melt type adhesive in terms of process and manufacturing cost.

In order to attach a different type of alloy or metal-based adherent to the adhesive, the adhesive needs to be secured to each of the alloys or the adherend made of metal, and the principle of the adhesive is also different.

First, in common, the adhesive force is created by mechanical engagement.

When any interface is observed from the microscopic side, the interface is uneven and has surface states such as projections, grooves, and scratches.

At this interface, the liquid adhesive is allowed to penetrate into the projections or grooves of the interface and harden or solidify.

The firmly hardened or solidified adhesive is mechanically engaged and has the same effect as if it were pegged to the ground or anchored in the sea.

The mechanical engagement described above is referred to as anchoring and this mechanical engagement creates an adhesive force between the adhesive and the adherend made of an alloy or metal.

In order to secure a better adhesive force on the basis of the above-described principle, it is generally preferable to subject the adhesive surface to surface treatment such as etching or corona treatment.

Since anchoring alone can not accommodate the formation of adhesive force and its principle, the material and principle of the adhesive should be considered according to the material to which the adhesive is applied.

Between the reflective film and the adhesive, the principle of adhesion between the polymers must be considered.

Not only the mechanical merge effect but also the adhesion between the polymer interfaces can be thermodynamically compatible or partially compatible with each other due to the diffusion effect of the polymer chain between the interface and the interface The diffused polymer chains form entanglement with other polymer chains.

When the two interfaces are separated by an external force, the entanglement of the polymer chain is loosened or the polymer chain is destroyed, which is a factor of forming the adhesion force.

The compatibility between the two polymers can be determined by the solubility parameter. When the polymer is bonded, the polymer is heat-treated at a temperature higher than the glass transition temperature or treated with a solvent to have sufficient fluidity so that mutual diffusion can occur.

The degree of diffusion of the polymer chain is defined as the depth of penetration, and thus the adhesion strength can also be defined by a formula.

The following equation 1 defines the diffusion depth of the polymer chain, equation 2 defines the number of polymer chains present at the interface, and equation 3 defines the bond strength according to equations 1 and 2.

I _p : diffusion depth

k: bond angle of the polymer chain, constant of bond length

D _t : constant containing the motility of the polymer chain

T _c : Adhesion time

N: Avogadro's number

d: density

M: Molecular weight

In order to secure the adhesion between the reflective film and the adhesive as described above, it is desirable to consider the diffusion effect of the polymer chain in addition to mechanical engagement.

Adhesion between the adhesive and the metal should take account of the bonding principle of the chemical bond.

Simply by mechanical engagement there is a limit to accepting all the adhesion and the principle of adhesion between the adhesive and the alloyed or adhered material.

Typical alloys or metals are characterized by their ability to react with moisture, oxygen, and oxidation.

These metals are likely to form an oxide film, which is also considered to be chemically reactive.

The structure of the dense structure such as a metal is difficult to apply the diffusion theory because the adhesive described above is difficult to diffuse at the interface of the alloy or the metal-made adherend.

At the interface between the metal and the adhesive, the functional group of the adhesive makes the metal chemically bonded with the adhesive, resulting in a difference in adhesion depending on the concentration of the functional group and the adhesion system.

The adhesion between metal and adhesive increases with increasing concentration of functional group, but tends to become constant or decrease.

This is a phenomenon in which a mono layer is formed on the surface of an alloy or an adherend made of metal and the remaining coupling agent or functional group serves to weaken the properties of the interface.

The chemical bond of the adhesive consists of a primary bond, ionic bond, covalent bond, and reacts with the functional group of the adhesive to form a chemical bond.

Not only the covalent bonds but also the high electronegativity due to the different electronegativity of the atoms participating in the bond, exhibit high adhesion due to the ionic bond nature.

Therefore, it is preferable to select a functional group capable of exhibiting the above-described adhesive force in consideration of chemical bonding between the functional group of the adhesive and the metal, in order to secure the adhesive force between the adhesive and the adhesive agent made of metal Do.

The method of applying the adhesive to the reflective film in the step (b) can be roughly classified into two types, that is, a liquid type adhesive and a solid adhesive.

The liquid adhesive can be applied by a method such as spraying or bar coating. In the case of a solid adhesive, it is generally possible to melt the adhesive using a heating device. It is preferable to bond them by a thermal lamination method.

The step of retaining the shape of the reflective film in the step (c) may be performed by forming a metal through a process such as bending, bending, or pressing after the metal, which is an adherend made of an alloy or metal, It is desirable to maintain the shape of the film.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. It will be self - evident that it is not to be interpreted as.

≪ Example 1 >

A method for manufacturing an adhesive for bonding aluminum to a polypropylene reflective film in order to practice the present invention will be described as follows.

First, 0.1 wt% of dicumyl peroxide (DCP, 98%, Sigma Aldrich), vinyltriethoxysilane (VTEOS, manufactured by Sigma Aldrich) was added to polypropylene powder (PP, Hyosung) 97%, Aldrich) for 20 minutes.

The compounds compounded in the above procedure are placed in a mixing chamber and subjected to a grafting reaction at a stirring speed of 60 rpm and a stirring temperature of 190 ° C for 8 minutes.

At this time, when the grafting reaction time is 3 minutes in the course of the reaction, 0.2 wt% of an antioxidant Irganox 225 (Ciba-Geigy) is added.

The pp-g-VTEOS and polypropylene prepared in the above process are blended at a ratio of 5: 5.

The polymer blend obtained in the above-described blending process was added as an additive 3 wt% of a filler CaCO3 (99.99% Sigma Aldrich) and 0.1 wt% of an antioxidant Irganox 225 (Ciba-Geigy) were compounded for 20 minutes to complete the adhesive.

In addition, the compounding material may be extruded at 220 ° C to produce a film.

(b) Polypropylene-based PP reflective film and adhesion material made of alloy or metal Foil adhesion

(1) An adhesive film having a thickness of 80 占 퐉 or less prepared in step (a) is placed on a PP reflective film having a thickness of 550 占 퐉 or less and made of polypropylene as a main material, Thereby covering the adherend foil.

Here, the thickness of the PP reflective film based on polypropylene as the main material varies between 190 and 550 탆 according to specifications of the product, and the adhesive also varies between 20 and 80 탆 according to specifications of the product, The thickness of the foil foil varies from 30 to 150 mu m according to the specifications of the product. The thickness of the foil is preferably 240 to 800 mu m.

(2) When the bonding is ready as in (1) above, it is heated and pressed at 130 ° C or less by hot press.

At this time, the temperature is also higher than 130 ° C, and the PP reflection film is not deformed using polypropylene as a main material

(c) Reflective film molding

    (1) The film formed by various bending operations such as roll bending, etc., of aluminum reflective reflective film in step (b) may have a curvature radius R value depending on the use of the product.

The present invention can be applied to a reflective sheet of a TV, a computer monitor, or a lighting apparatus, and is applicable to industrial applications.

Claims (8)

delete A reflective film production step of fabricating a reflective film using polypropylene or polyethyleneterephtalate as a main material, a step of producing an adherend made of an alloy or metal made of foil, An adhesive manufacturing step of producing an adhesive for adhering a film and an adherend made of an alloy or a metal, and an adhesive or an adherend made of an alloy or a metal to bond the adherend made of an alloy or metal to the reflective film using an adhesive Wherein the shape-retroreflective film is formed by a method comprising the steps of:
The adhesion of the alloy or metallic material is carried out by placing an adhesive having a thickness of 80 μm or less on a reflective film having a thickness of 550 μm or less made of polypropylene or polyethyleneterephtalate as a main material, Is coated with an adherend made of an alloy or metal material having a thickness of 150 占 퐉 or less and heated to 130 占 폚 or less to obtain a reflective film having a thickness of 760 占 퐉 or less. delete A reflective film production step of producing a reflective film using polypropylene or polyethyleneterephtalate as a main material; an alloy or alloy which is made of alloy or metal material made of foil as an alloy; A method for manufacturing a reflective film, comprising the steps of: preparing a substrate made of a metal; producing an adhesive for bonding the reflective film to an alloy or an adherend made of metal; A forming step of forming a reflective film adhered to an adherend made of an alloy or a metal material by bending to maintain the shape of the film; In the method,
In the adhesion step of the alloy or the metal material, an adhesive having a thickness of 80 μm or less is placed on a reflective film having a thickness of 550 μm or less made of polypropylene or polyethyleneterephtalate as a main material, and a foil Or less, and is heated and pressed at 150 DEG C or less to obtain a reflective film having a thickness of 760 mu m or less. The reflective film is bent in an external pressure in a molding step to form a molded film having a radius of curvature R value of 50 mm or less. delete delete delete delete

Images