KR102214896B1 - Adhesive composition for re-releasable window film and re-releasable window film for construction comprising the same - Google Patents

Abstract

The present invention relates to a composition for a window film and a re-peelable architectural window film including the composition, in which the composition includes: an acryl monomer mixture including 20 to 30 parts by weight of 2-ethylhexyl acrylate, 10 to 20 parts by weight of methoxy polyethylene glycol methacrylate, 1 to 2 parts by weight of 2-hydroxyethyl acrylate, and 1 to 2 parts by weight of 2-hydroxyethyl methacrylate; 0.1 to 0.2 parts by weight of an azobisnitrile thermal initiator; and 40 to 50 parts by weight of ethyl acetate. According to the re-peelable architectural window film of the present invention, re-peelability is excellent so as to facilitate removal from the window, a weather resistance is excellent so as to facilitate re-peeling even when used for a long period of time, and no residue or remnants are left.

Description

The adhesive composition for a re-peelable architectural window film and a re-peelable architectural window film containing the same {ADHESIVE COMPOSITION FOR RE-RELEASABLE WINDOW FILM AND RE-RELEASABLE WINDOW FILM FOR CONSTRUCTION COMPRISING THE SAME}

The present invention relates to a pressure-sensitive adhesive composition for a window film and a re-peelable architectural window film using the same, and more particularly, a pressure-sensitive adhesive composition for an architectural window film having convenient construction and excellent re-peelability, and a re-peelable architectural window film comprising the same It is about.

Sunlight is largely divided into ultraviolet rays, visible rays, and infrared rays. When the skin is exposed for a long time, UV rays can cause skin aging and cancer, and infrared rays increase the indoor temperature and cause an increase in cooling costs in summer.

Conventionally, windows of buildings and vehicles have window films to block ultraviolet rays or infrared rays in order to solve problems such as deterioration of the window film due to ultraviolet rays or infrared rays contained in sunlight, pigmentation on the skin, and increase in indoor temperature. Has been used. This window film is attached to the window of a building or vehicle by an adhesive.

Construction window films are constructed by construction experts, or the general public directly constructs architectural window films. In the case of the window film pasted on the window of the building, it is necessary to remove the installed window film due to the change of tenants and the change of business type. However, in the case of the existing architectural window film, there is a disadvantage that it is difficult to remove once applied because it has strong adhesive strength, and in some cases, there is a problem that an additional cost occurs because an individual cannot directly remove it and has to call an expert.

In addition, due to the strong adhesive strength of the existing window film for construction, it is impossible to rework after removing it if a consumer incorrectly constructs it, and in some cases, the film is torn or damaged in the process of peeling the window film, making it impossible to use it. Occurs.

KR 1020040067051 A

The present invention is to solve the problems of the prior art described above, one object of the present invention is a pressure-sensitive adhesive composition for an architectural window film that is easy to remove after attaching due to excellent re-peelability, and a re-peelable architectural window film using the same Is to provide

Another object of the present invention is to provide a pressure-sensitive adhesive having low initial adhesive strength and excellent wettability to provide a window film for construction that can be easily constructed by consumers.

Another object of the present invention is to provide a window film for construction that is excellent in heat resistance and weather resistance, and is excellent in re-peelability even after a long period of time has elapsed, and that the transfer of the adhesive or change over time is not large.

One aspect of the present invention for solving the above-described problem,

20 to 30 parts by weight of 2-ethylhexyl acrylate, 10 to 20 parts by weight of methoxy polyethylene glycol methacrylate, 1 to 2 parts by weight of 2-hydroxyethyl acrylate, and 1 to 2 of 2-hydroxyethyl methacrylate Acrylic monomer mixture consisting of parts by weight, 0.1 to 0.2 parts by weight of azobisnitrile thermal initiator; And it relates to a pressure-sensitive adhesive composition for a re-peelable architectural window film comprising 40 to 50 parts by weight of ethyl acetate.

Another aspect of the present invention for solving the above-described problem,

Base layer; An adhesive layer formed by applying an adhesive composition to one surface of the base layer; And it includes a release film for protecting the adhesive layer, wherein the adhesive layer is 2-ethylhexyl acrylate 20 to 30 parts by weight, methoxy polyethylene glycol methacrylate 10 to 20 parts by weight, 2-hydroxyethyl acrylate 1 ~ 2 parts by weight, and an acrylic monomer mixture composed of 1 to 2 parts by weight of 2-hydroxyethyl methacrylate, 0.1 to 0.2 parts by weight of azobisnitrile thermal initiator; And it relates to a re-peelable architectural window film comprising 40 to 50 parts by weight of ethyl acetate.

Another aspect of the present invention for solving the above-described problem,

20 to 30 parts by weight of 2-ethylhexyl acrylate, 10 to 20 parts by weight of methoxy polyethylene glycol methacrylate, 1 to 2 parts by weight of 2-hydroxyethyl acrylate, and 1 to 2 of 2-hydroxyethyl methacrylate Acrylic monomer mixture consisting of parts by weight, 0.1 to 0.2 parts by weight of azobisnitrile thermal initiator; And 40-50 parts by weight of ethyl acetate were added to the reactor to induce an exothermic reaction at 85°C, and then 0.1-0.2 parts by weight of an azobis nitrile thermal initiator was additionally added, and after completion of the exothermic reaction, naturally descending aging at 60°C for 8 hours. Proceeding to the step of obtaining a pressure-sensitive adhesive; And

It relates to a method for producing a re-peelable architectural window film comprising the step of coating a base layer by mixing 1 to 5 parts by weight of a hexadiisocyanate curing agent in the obtained pressure-sensitive adhesive.

The re-peelable architectural window film of the present invention is easy to remove, and has the advantage of excellent re-peelability and reworkability due to less residue upon removal. Due to this advantage, there is a great advantage that general consumers can easily install the window film while removing and attaching it.

In addition, the pressure-sensitive adhesive composition for a window film according to the present invention has low initial adhesive strength and good wettability, and provides a window adhesive having good weatherability without transfer and transfer over time, so that the re-peelable composition prepared using the adhesive composition of the present invention The type construction window film has no transition when removed even after a considerable period of use, for example, 2 years or more after construction, and can provide a re-peelable construction window film that is easy to remove.

Hereinafter, the present invention will be described in more detail. Throughout this specification, when a certain part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated. In addition, in the present application, the term "top" or "top" used in relation to the interlayer stacking position is not only when a certain configuration is formed directly on another configuration, but a third component is interposed between these configurations. It means to include until the case.

The “re-peelable adhesive” used in the re-peelable architectural window film in the present invention refers to an adhesive that can be easily removed when the adhesive is removed after being attached to the substrate and does not leave stains or residues.

One aspect of the present invention is 2-ethylhexyl acrylate 20 to 30 parts by weight, methoxy polyethylene glycol methacrylate 10 to 20 parts by weight, 2-hydroxyethyl acrylate 1 to 2 parts by weight, and 2-hydroxy An acrylic monomer mixture consisting of 1 to 2 parts by weight of ethyl methacrylate, 0.1 to 0.2 parts by weight of azobisnitrile thermal initiator; And it relates to a pressure-sensitive adhesive composition for a re-peelable architectural window film comprising 40 to 50 parts by weight of ethyl acetate.

The pressure-sensitive adhesive composition for a re-peelable architectural window film of the present invention is included as a component that controls the crosslinking reaction of the pressure-sensitive adhesive in order to implement excellent re-peelability. The adhesive composition for a re-peelable architectural window film of the present invention is a post-curing type of hexadiisocyanate, which provides a non-yellowing property and reduces weather resistance and change over time in order to control the strong adhesive force, which is a problem of the existing adhesive for window films. Included as a curing agent. Such a post-curing type curing agent has a tendency to decrease cohesive strength due to steric hindrance when curing is performed too quickly. To control this, a delayed catalyst is used, and it is more advantageous to aging at room temperature than for forced aging.

The post-curing type curing agent is preferably included in an amount of 1 to 5 parts by weight based on 100 parts by weight of the acrylic polymer. When the content is included within the above range, it is better in adhesive strength, heat resistance and pressure resistance.

The pressure-sensitive adhesive composition for a window film of the present invention may further include one or more selected from the group consisting of an infrared absorber, an infrared blocker, an ultraviolet absorber, and a sunscreen. As an infrared absorber, antimony tin oxide (ATO) or indium tin oxide (ITO) may be further included. The ultraviolet absorber may include at least one selected from a benzotriazole-based ultraviolet absorber, a benzophenone-based ultraviolet absorber, and an octylmethoxy synermate-based ultraviolet absorber.

Various additives, such as an anti-aging agent, an antioxidant, a light stabilizer, an antistatic agent, a lubricant, and a colorant, may be further blended in the pressure-sensitive adhesive composition for a re-peelable architectural window film of the present invention. The kind and blending amount of these additives can be the same as the common kind and blending amount in the field of general adhesives.

When the adhesive layer contains an antioxidant, oxidation and deterioration of the adhesive contained in the adhesive layer can be suppressed, and the weather resistance of the adhesive layer can be further improved.

The antioxidant is not particularly limited, and can be arbitrarily selected depending on the influence on the visible light transmittance of the adhesive layer, the desired weather resistance, and the like. For example, phenol-based antioxidants, sulfur-based antioxidants, phosphorus-based antioxidants, and the like can be appropriately used as necessary.

The content of the antioxidant in the composition of the present invention is not particularly limited, and can be arbitrarily selected depending on the visible light transmittance and weather resistance required for the adhesive layer. The content of the antioxidant in the adhesive layer is preferably 0.05 parts by weight or more and 5.0 parts by weight or less. This is because when the content of the antioxidant is 0.05 parts by weight or more, the effect of the addition of the antioxidant can be sufficiently exhibited in the adhesive layer. In addition, if the content is 5.0 parts by weight or less, the precipitation of the antioxidant in the adhesive layer can be more reliably prevented, and the transparency of the adhesive layer or the like is not significantly affected.

Another aspect of the present invention is a base layer; An adhesive layer formed by applying an adhesive composition to one surface of the base layer; And it includes a release film for protecting the adhesive layer, wherein the adhesive layer is 2-ethylhexyl acrylate 20 to 30 parts by weight, methoxy polyethylene glycol methacrylate 10 to 20 parts by weight, 2-hydroxyethyl acrylate 1 ~ 2 parts by weight, and an acrylic monomer mixture consisting of 1 to 2 parts by weight of 2-hydroxyethyl methacrylate, 0.1 to 0.2 parts by weight of azobis nitrile thermal initiator; And it relates to a re-peelable architectural window film comprising 40 to 50 parts by weight of ethyl acetate.

When the re-peelable architectural window film of the present invention is used for a window of a car or a building, it not only blocks ultraviolet rays and heat rays of sunlight, but also reduces the transmittance of sunlight to increase the cooling and heating efficiency of the interior or vehicle, It aims to prevent skin aging by blocking UV rays.

And, when the pressure-sensitive adhesive composition of the present invention further contains an ultraviolet absorber, it becomes possible to block light in the ultraviolet region, and in particular, the effect of suppressing an increase in temperature can be improved. In addition, since the pressure-sensitive adhesive composition of the present invention contains an ultraviolet absorber, for example, the influence of ultraviolet rays on humans or interior articles, such as the interior of a car or a building having a window with a window film comprising the pressure-sensitive adhesive composition of the present invention, or Deterioration due to ultraviolet rays and the like can be particularly suppressed.

The ultraviolet absorber is not particularly limited, and can be arbitrarily selected depending on the influence on the visible light transmittance of the adhesive layer, ultraviolet absorption ability, durability, and the like. Examples of the ultraviolet absorber include organic ultraviolet absorbers such as benzotriazole compounds, benzophenone compounds, salicylic acid compounds, triazine compounds, benzotriazoryl compounds, and benzoyl compounds, and inorganic ultraviolet rays such as zinc oxide, titanium oxide, and cerium oxide. Absorbents and the like. In particular, it is preferable that the ultraviolet absorber contains at least one selected from a benzotriazole compound and a benzophenone compound. This is because the benzotriazole compound and the benzophenone compound can make the visible light transmittance of the adhesive layer very high even when a concentration sufficient to absorb ultraviolet rays is added, and have high durability against long-term exposure to strong ultraviolet rays. to be.

In the pressure-sensitive adhesive composition of the present invention, the content of the ultraviolet absorber can be arbitrarily selected according to the visible light transmittance and ultraviolet shielding ability required for the pressure-sensitive adhesive layer. The content of the ultraviolet absorber in the adhesive layer is preferably 0.02 parts by weight or more and 5.0 parts by weight or less. This is because if the content of the ultraviolet absorber is 0.02 parts by weight or more, the ultraviolet region light that cannot be completely absorbed by the composite tungsten oxide particles can be sufficiently absorbed. In addition, it is because when the content is 5.0 parts by weight or less, precipitation of the ultraviolet absorber in the adhesive layer is more reliably prevented, and the transparency of the adhesive layer is not significantly affected.

The base layer is a component that serves as a support for the window film, and may be a transparent thin film having a transmittance of 70% or more for visible light. As long as the transmittance described above is satisfied, the material used for the base layer is not particularly limited. For example, a known glass or resin film can be used.

For example, the base layer may include a transparent flexible resin. For example, polyester resins such as polyethylene terephthalate resin, polyethylene naphthalate resin, and polybutylene terephthalate resin, acetate resin, polyether sulfone resin, polycarbonate resin, polyimide resin, polyolefin resin Paper, (meth)acrylate-based resin, polyvinyl chloride-based resin, polystyrene-based resin, polyvinyl alcohol-based resin, polyarylate-based resin, or polyphenylene sulfide-based resin may be used for the base layer. Although not particularly limited, the base layer may have a thickness of, for example, 5 μm or more, 10 μm or more, 20 μm or more, or 30 μm or more, and the upper limit may be 200 μm or 150 μm.

In the present invention, the adhesive layer may be covered with a release film as needed, and the release film may include a paper material, a plastic film, a silicone release film, etc., but is not limited thereto.

The window film of the present invention may further include a hard coating layer on the opposite surface of the base layer on which the adhesive layer is formed. By including the hard coating layer, scratch resistance and durability of the window film may be improved. More specifically, the window film may sequentially include a release film, an adhesive layer, a base layer, and a hard coating layer. The configuration of the hard coating layer is not particularly limited as long as it does not impair the transmittance of the window film, and may be, for example, a layer having transparency as a cured layer of a resin composition containing organic or inorganic particles. For example, the hard coating layer may be a layer obtained by curing an acrylic resin, a (meth)acrylate monomer, or a composition having a polymer thereof. The composition for forming the hard coating layer may further include inorganic particles such as silica, zirconia or alumina.

The re-peelable architectural window film of the present invention includes antimony tin oxide or indium tin oxide, which are general infrared blocking materials in the adhesive layer, in order to realize infrared absorption performance, and may block short and long wavelength portions of ultraviolet rays.

In order to realize the infrared blocking performance in the re-peelable architectural window film of the present invention, a general aluminum film can be applied by a deposition process, and nickel chromium and nickel are used to achieve a high infrared reflection effect while maintaining high visible light transmittance. , It is possible to apply a sputter film implemented with indium tin oxide.

Another aspect of the present invention relates to a method of manufacturing a re-peelable architectural window film. In the method of the present invention, 20 to 30 parts by weight of 2-ethylhexyl acrylate, 10 to 20 parts by weight of methoxy polyethylene glycol methacrylate, 1 to 2 parts by weight of 2-hydroxyethyl acrylate, and 2-hydroxyethyl methacrylate Acrylic monomer mixture consisting of 1 to 2 parts by weight of acrylate, 0.1 to 0.2 parts by weight of azobis nitrile thermal initiator; And 40-50 parts by weight of ethyl acetate were added to the reactor to induce an exothermic reaction at 85°C, and then 0.1-0.2 parts by weight of an azobis nitrile thermal initiator was additionally added, and after completion of the exothermic reaction, naturally descending aging at 60°C for 8 hours. To obtain an adhesive. Subsequently, 1 to 5 parts by weight of a hexadiisocyanate curing agent is mixed with the obtained pressure-sensitive adhesive to coat the substrate, whereby a re-peelable architectural window film can be prepared. At this time, the polymerization process using the acrylic monomer may be polymerized so that the weight average molecular weight of the acrylic pressure-sensitive adhesive is 200,000 to 300,000.

The acrylic polymer can be prepared by various polymerization methods. Examples of the polymerization method of the acrylic polymer include a solution polymerization method, an emulsion polymerization method, a bulk polymerization method, and a polymerization method by UV irradiation, but solution polymerization from the viewpoint of transparency, water resistance, and cost. The method is suitable. When preparing the acrylic polymer, the acrylic monomer mixture is dissolved in an organic solvent, and an appropriate free radical initiator that exhibits activity by heat is added to perform polymerization. As an initiator activated by heat, an azo compound such as azobisnitrile is suitable. The amount of the polymerization initiator used may be a normal amount, and for example, the polymerization initiator may be selected in the range of 0.1 parts by weight to 0.2 parts by weight based on 100 parts by weight of all monomer components constituting the acrylic polymer.

The organic solvent used in the solution polymerization method is preferably inert to the monomers and polymers mentioned in the above group and does not adversely affect the polymerization reaction, ethyl acetate is used as an appropriate solvent, and the usual polymerization temperature is from 50°C to 140°C is preferable, and the reaction time is preferably 4 to 10 hours.

The acrylic polymer may be prepared by copolymerizing monomers of the above composition. It is preferable that the molecular weight of the acrylic polymer has a value in the range of 200,000 to 300,000 molecular weight in consideration of adhesive properties and coating properties. When the weight average molecular weight of the acrylic polymer increases, the viscosity of the pressure-sensitive adhesive composition at the same solid content concentration increases as compared to the case where the weight average molecular weight is low. Therefore, when the weight average molecular weight of the acrylic polymer exceeds 300,000, the solid content concentration of the pressure-sensitive adhesive composition cannot be increased, so that there is a case where the overall thickness variation becomes large. Therefore, as described above, the weight average molecular weight of the acrylic polymer is preferably 300,000 or less.

In the method of the present invention, an aluminum deposited film, a nickel chromium film, and a nickel film may be formed as a hard coating layer by a deposition process. The hard coating layer is formed by curing after applying the hard coating composition on a plastic substrate film, and electromagnetic waves that polymerize acrylic vinyl groups such as ultraviolet rays, electron beams and radiation may be applied, and it is industrially easy to use ultraviolet rays.

In particular, the re-peelable architectural window film of the present invention is easy to re-peel even after storage for a long time under high temperature in a state attached to an adherend.

Hereinafter, the present invention will be described in more detail with reference to examples, but these examples are for illustrative purposes only and should not be construed as limiting the present invention in any sense. do. In addition, in the following examples, "parts" and "%" are based on weight.

1. Preparation of adhesive composition for re-peelable architectural window film

Example 1

<Preparation of adhesive composition>

As an adhesive for a window film in the reactor, 25 parts by weight of 2-ethylhexyl acrylate (2-EHA), 15 parts by weight of methoxy polyethylene glycol methacrylate (MPEGMA), 2 parts by weight of 2-hydroxyethyl acrylate (2-HEA) Parts, and an acrylic monomer mixture composed of 1 part by weight of 2-hydroxyethyl methacrylate (2-HEMA), and 45 parts by weight of ethyl acetate were added to induce an exothermic reaction slowly while adding a temperature to 85°C. After the exothermic reaction, the main reaction was carried out for 8 hours, and 0.15 parts by weight of azobisnitrile (AIBN) thermal initiator was additionally added to remove the intermediate residual monomer. After completion of the reaction, aging was carried out at 60° C. for 8 hours to prepare an acrylic polymer adhesive. 2 parts by weight of a hexadiisocyanate (HDI) post-curing type curing agent was added to the finished adhesive, mixed uniformly, coated on a release paper, dried, and a uniform adhesive layer of 25 μm was obtained.

<Production of window film>

The pressure-sensitive adhesive composition was coated on the prepared PET film, dried for 2 minutes at 120° C. in a hot air circulation dryer, and the release film was laminated to prepare a window film.

Physical properties were measured by the method described below for the prepared window film, and the results are shown in Table 1 below. In Table 1 below, the content of each component is in parts by weight.

Example 2

A window film was prepared in the same manner as in Example 1, except that 5 parts by weight of a benzotriazole compound as a sunscreen agent was added to the pressure-sensitive adhesive for a window film, and the properties were evaluated in the same manner, and the results are shown in Table 1 below. Shown together.

Example 3

Window film was carried out in the same manner as in Example 1, except that an aluminum metal layer was deposited to a thickness of 14 nm under conditions of 1.5 W/cm 2 and 3 mTorr on the PET film substrate using a DC sputtering method to form a hard coating layer. Was prepared, and the physical properties of the prepared window film were evaluated by the same method, and the results are shown together in Table 1 below.

Comparative Examples 1 to 3

Except that the components of the pressure-sensitive adhesive composition for a window film were changed as shown in Table 1 below, a re-peelable architectural window film was prepared in the same manner as in Example 1, and the physical properties of the prepared window film were the same. Evaluation by the method and the results are shown together in Table 1 below.

Comparative Example 4

Except for using oxazoline in place of hexadiisocyanate as a post-curing type curing agent in Example 1, a re-peelable architectural window film was prepared in the same manner as in Example 1, and the physical properties of the prepared window film were the same. And the results are shown in Table 1 below.

Test Example: Method for evaluating physical properties of window film

The physical properties of the window films prepared in Examples and Comparative Examples were evaluated in the following manner.

<Peeling power>

After attaching a window film (2.5 cm X 20 cm) to a glass plate by reciprocating once with a 2 kg rubber roller, and storing it for 24 hours at 23°C temperature and 55% relative humidity, 180° angle and 0.3 m It was measured using a tensile tester (Stable Micro Systems) at a peel rate of /min and expressed as g/25mm.

<Re-peelability>

A specimen was prepared by fixing a window film on a glass plate, and the specimen was left at a temperature of 23°C and a relative humidity of 55% for 24 hours and 500 hours, and then peeled off at an arbitrary tensile speed in the 90° direction to visually retain residual adhesive. The degree of water was examined, and at this time, it was evaluated that the residual pressure-sensitive adhesive was not visible at all, and that the residual pressure-sensitive adhesive was visible as ×.

<Weather resistance>

After preparing a specimen by fixing the window film to a glass plate, the specimen was left at 80° C. or 60° C. in an atmosphere of 95% RH for 500 hours, respectively, and a weather resistance test was performed. After the weather resistance test, the state of the adhesive interface was visually inspected, and at this time, it was evaluated as ◯ for a specimen without bubbles or floating, etc. as a defect in appearance, and x for a small amount of the bubbles or floating.

<wetability>

The window film prepared in Example was attached to one side of the glass plate by reciprocating once with a 2 kg rubber roller, and after an autoclave process for 90 minutes under a pressure of 75° C. and 5 kg/cm 2, it was determined whether or not bubbles were generated. The test piece without bubbles was evaluated as excellent, and when a large number of bubbles were found, it was evaluated as defective.

Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Comparative Example 3 Comparative Example 4 acryl
Monomer
mixture 2-EHA 25 25 29 32 40 10 25 MEGMA 15 15 18 9 15 25 15 2-HEA 2 2 2 1.5 One 2 1.5 2-HEMA One One 2 1.5 One 2 1.5 Initiator AIBN 15 15 0.2 0.1 0.1 0.1 0.15 UV blocker 5 Hardener HDI 2 2 2 - - - Oxazoline 2 solvent EA 45 41 48 45 41 48 45 film
Properties Peel force (g/25㎜) 890 920 850 1100 1250 1050 1200 Re-peelability
(24 hrs) ○ ○ ○ × × × × Re-peelability
(500 hrs) ○ ○ ○ × × × × Weather resistance ○ ◎ ○ × × × × Wettability Great Great Great Bad Bad Bad Bad

Referring to Table 1, in the case of a film made of a pressure-sensitive adhesive composition for a re-peelable architectural window film according to Examples 1 to 3, relatively low peel strength (g /25mm), and since there is no residue, it can be seen that re-peelability and reworkability are excellent. In the case of Comparative Example 2, the peel force is less than 20 g/25mm, and there is a problem that the film is peeled off even by a slight impact, and a residue remains.

The present invention described above is not limited to the above-described embodiments, but various modifications and changes by those skilled in the art within the scope not departing from the spirit and scope of the present invention described in the following claims. It is of course also included within the scope of the present invention.

Claims (13)

delete delete delete delete delete delete delete delete delete 20 to 30 parts by weight of 2-ethylhexyl acrylate, 10 to 20 parts by weight of methoxy polyethylene glycol methacrylate, 1 to 2 parts by weight of 2-hydroxyethyl acrylate, and 1 to 2 of 2-hydroxyethyl methacrylate Acrylic monomer mixture consisting of parts by weight, 0.1 to 0.2 parts by weight of azobisnitrile thermal initiator; And 40-50 parts by weight of ethyl acetate were added to the reactor to induce an exothermic reaction at 85°C, and then 0.1-0.2 parts by weight of an azobis nitrile thermal initiator was additionally added, and after completion of the exothermic reaction, naturally descending aging at 60°C for 8 hours Proceeding to the step of obtaining an adhesive; And
A method for producing a re-peelable architectural window film comprising the step of coating a base layer by mixing 1 to 5 parts by weight of a hexadiisocyanate curing agent in the obtained pressure-sensitive adhesive. 11. The method of claim 10, wherein the method comprises polymerizing the acrylic pressure-sensitive adhesive to have a molecular weight of 200,000 to 300,000.
The method of claim 11, wherein the base layer is a polyester-based resin, an acetate-based
Resin, polyethersulfone resin, polycarbonate resin, polyimide resin, polyolefin resin, (meth)acrylate resin, polyvinyl chloride resin, polystyrene resin, polyvinyl alcohol resin, polyarylate resin Method for producing a re-release type window film, characterized in that using a film composed of at least one selected from the group consisting of resin and polyphenylene sulfide-based resin.
The method of claim 11, wherein the method further comprises forming an aluminum deposited film, a nickel chromium film, and a nickel film as a hard coating layer by a deposition process.