KR102293568B1 - Composition for foam adhesive tape and foam adhesive tape comprising cured product thereof - Google Patents

Abstract

The present invention relates to a foam adhesive tape having excellent adhesive strength and bubble stability, and a foam adhesive tape composition capable of implementing the same.

Description

Foam adhesive tape comprising a composition and a cured product thereof

The present invention relates to a foam adhesive tape composition and a foam adhesive tape comprising a cured product thereof.

Foam adhesive tape is used for bonding between parts of electronic products, for interior decoration such as kitchen furniture sinks and furniture, for adhesion of interior and exterior materials of automobiles, and for decoration of appearance by attaching it to a painted surface or film coated on glass. can be used in the field.

This foam adhesive tape contains pores (bubbles) in the tape, and a surfactant is used to improve the dispersion stability of these pores. However, when a general surfactant is used in manufacturing the conventional foam adhesive tape, there is a problem in that the surface migration (migration) of the surfactant occurs, and the productivity of the foam adhesive tape is lowered.

In addition, in the conventional foam adhesive tape, the amount of the crosslinking agent used for crosslinking with the monomer component constituting the foam adhesive tape is relatively large, and there is a problem in that the adhesive strength of the foam adhesive tape to be manufactured is lowered.

Accordingly, there is a need for the development of a foam adhesive tape having excellent bubble stability without a decrease in adhesive strength compared to the conventional foam tape.

An object of the present invention is to provide a foam adhesive tape having excellent adhesive strength and bubble stability, and a foam adhesive tape composition capable of implementing the same.

However, the problems to be solved by the present invention are not limited to the above-mentioned problems, and other problems not mentioned will be clearly understood by those skilled in the art from the following description.

An exemplary embodiment of the present invention is an acrylic copolymer; photoinitiators; hollow filler; crosslinking agent; And a surfactant, wherein the surfactant provides a foam adhesive tape composition comprising a fluorinated oligomer containing a photoreactive functional group.

In addition, an exemplary embodiment of the present invention provides a foam adhesive tape comprising a cured product of the foam adhesive tape composition.

The foam adhesive tape composition according to an exemplary embodiment of the present invention may provide a foam adhesive tape having excellent adhesiveness and bubble stability.

The foam adhesive tape according to an exemplary embodiment of the present invention has the advantage of excellent adhesion and excellent bubble stability.

Effects of the present invention are not limited to the above-described effects, and effects not mentioned will be clearly understood by those skilled in the art from the present specification and accompanying drawings.

1 schematically shows a method for measuring the high-temperature shear strength of a foam adhesive tape according to an embodiment of the present invention.

In the present specification, when a part "includes" a certain component, it means that other components may be further included rather than excluding other components unless otherwise stated.

Throughout this specification, when a member is said to be “on” another member, this includes not only a case in which a member is in contact with another member but also a case in which another member is present between the two members.

Throughout this specification, the unit “part by weight” may mean a ratio of weight between each component.

Throughout this specification, "(meth)acrylate" is used in the collective sense of acrylate and methacrylate.

Throughout this specification, "A and/or B" means "A and B, or A or B."

Throughout this specification, the term "monomer unit" may refer to a form in which a monomer is reacted in a polymer, and specifically, the monomer undergoes a polymerization reaction to form a backbone of the polymer, for example, a main chain or a side chain. It can mean the shape forming the .

Throughout this specification, the "weight average molecular weight" and "number average molecular weight" of a compound may be calculated using the molecular weight and molecular weight distribution of the compound. Specifically, a sample sample having a concentration of 1 wt% of the compound is prepared by putting tetrahydrofuran (THF) and a compound in a 1 ml glass bottle, and the standard sample (polystyrene, polystryere) and the sample sample are filtered (pore size). After filtration through 0.45 mm), it is injected into a GPC injector, and the molecular weight and molecular weight distribution of the compound can be obtained by comparing the elution time of the sample sample with the calibration curve of the standard sample. In this case, an Infinity II 1260 (Agilient Corporation) may be used as a measuring device, the flow rate may be set to 1.00 mL/min, and the column temperature may be set to 40.0 °C.

Throughout this specification, the viscosity of the compound may be a value measured with a Brookfield viscometer at a temperature of 25 °C.

Hereinafter, the present specification will be described in more detail.

An exemplary embodiment of the present invention is an acrylic copolymer; photoinitiators; hollow filler; crosslinking agent; And a surfactant, wherein the surfactant provides a foam adhesive tape composition comprising a fluorinated oligomer containing a photoreactive functional group.

The foam adhesive tape composition according to an exemplary embodiment of the present invention may provide a foam adhesive tape having excellent adhesiveness and bubble stability. Specifically, the foam adhesive tape composition may be a composition for forming a foam adhesive tape.

According to an exemplary embodiment of the present invention, the foam adhesive tape composition may further include air bubbles. Specifically, by injecting air bubbles into the foam adhesive tape composition, it is possible to form a foam adhesive tape composition including air bubbles. By adopting the apparatus and / or method used in the art without limitation, air bubbles can be injected into the foam adhesive tape composition. For example, by using a Frother device, nitrogen gas may be injected into the foam adhesive tape composition to form bubbles in the foam adhesive tape composition.

According to an exemplary embodiment of the present invention, by using a surfactant comprising a fluorinated oligomer containing a photoreactive functional group, it is possible to suppress migration of the surfactant to the surface of the foam adhesive tape, and through this, the foam It is possible to effectively prevent the product and adhesive strength of the adhesive tape from being deteriorated. Specifically, when irradiating light to the foam adhesive tape composition, the photoreactive functional group of the fluorinated oligomer included in the surfactant reacts to light, and may be combined with the acrylic copolymer. Through this, the surfactant is inhibited from migrating to the surface of the foam adhesive tape, and the surfactant can effectively stabilize the bubbles (pores) of the foam adhesive tape. That is, the photoreactive functional group of the fluorine-containing oligomer included in the surfactant is bonded to the acrylic copolymer, and the main chain of the fluorine-containing oligomer including fluorine can stabilize the bubbles in the composition of the foam adhesive tape.

According to an exemplary embodiment of the present invention, the photoreactive functional group of the fluorinated oligomer included in the surfactant may be a (meth)acrylate group. Specifically, the photoreactive functional group may be bonded to the main chain of the fluorinated oligomer to form a side chain. More specifically, the photoreactive functional group may be an end group bonded to one end of the main chain of the fluorinated oligomer.

According to an exemplary embodiment of the present invention, when light is irradiated to the foam adhesive tape composition, the fluorinated oligomer is the acrylic copolymer and other monomer components included in the foam adhesive tape composition through the photoreactive functional group. can be combined with Specifically, the (meth)acrylate group, which is a photoreactive functional group of the fluorinated oligomer, may have excellent compatibility with the acrylic copolymer included in the foam adhesive tape composition.

That is, the surfactant including a fluorinated oligomer having a (meth)acrylate group as a photoreactive functional group has excellent compatibility with the acrylic copolymer, whereby the surfactant in the foam adhesive tape composition is an acrylic copolymer and The interface of the bubble can be effectively stabilized. Through this, it is possible to implement a foam adhesive tape with excellent bubble stability.

According to an exemplary embodiment of the present invention, the fluorinated oligomer may include a monomer unit derived from a chain aliphatic monomer in which at least one fluorine is substituted on at least one carbon. That is, the fluorine-containing oligomer may be a polymer of a chain aliphatic monomer in which at least one fluorine is substituted on at least one carbon. For example, when tetrafluoro ethylene is used as a chain aliphatic monomer in which at least one fluorine is substituted for at least one carbon, the fluorinated oligomer is “-(CF ₂ -CF ₂ )n- “It may contain monomer units of the structure. Specifically, the main chain of the fluorinated oligomer may consist of monomer units derived from the monomers.

According to an exemplary embodiment of the present invention, the chain-type aliphatic monomer does not include a ring structure and may refer to a monomer including a hydrocarbon chain containing an unsaturated bond.

According to an exemplary embodiment of the present invention, by using the surfactant including the fluorinated oligomer, it is possible to effectively improve the stability of the bubbles in the foam adhesive tape.

According to an exemplary embodiment of the present invention, the weight average molecular weight of the fluorinated oligomer having a photoreactive functional group may be 5,000 g/mol or more and 30,000 g/mol or less. Specifically, the weight average molecular weight of the fluorinated oligomer having a photoreactive functional group is 6,500 g/mol or more and 25,000 g/mol or less, 8,000 g/mol or more and 20,000 g/mol or less, 9,500 g/mol or more and 15,000 g/mol or less, or 10,000 g/mol or more and 13,500 g/mol or less. The surfactant including the fluorinated oligomer having a photoreactive functional group having a weight average molecular weight satisfying the above range has excellent compatibility with the acrylic copolymer, and can effectively stabilize the bubbles in the foam adhesive tape composition. have.

According to an exemplary embodiment of the present invention, the fluorinated oligomer having a photoreactive functional group included in the surfactant may be nonionic. The surfactant including a fluorinated oligomer having a nonionic photoreactive functional group has excellent compatibility with the acrylic copolymer, and can maintain a homogeneously mixed state in the foam adhesive tape composition.

According to an exemplary embodiment of the present invention, the surfactant may include a surfactant compound that does not include a photoreactive functional group in addition to the fluorinated oligomer containing a photoreactive functional group. In this case, the weight ratio of the fluorinated oligomer containing the photoreactive functional group to the surfactant compound not including the photoreactive functional group may be 1:0.5 to 1:1.5, specifically 1:1. The surfactant compound not including the photoreactive functional group may include a compound used as a surfactant in the art, and specifically may include a fluorine-based surfactant and/or a silicone-based surfactant.

According to an exemplary embodiment of the present invention, the content of the surfactant may be 0.1 parts by weight or more and 5 parts by weight or less based on 100 parts by weight of the acrylic copolymer. Specifically, the content of the surfactant may be 0.5 parts by weight or more and 4.5 parts by weight or less, and 2 parts by weight or more and 4 parts by weight or less based on 100 parts by weight of the acrylic copolymer. By adjusting the content of the surfactant to the above-mentioned range, it is possible to improve the stability of the bubbles in the foam adhesive tape, and it is possible to effectively suppress the deterioration of the adhesive performance of the foam adhesive tape. In addition, the heat resistance of the foam adhesive tape may be improved, and the adhesive holding power may be excellent even at a high temperature. Furthermore, when the content of the surfactant is within the above range, the foam adhesive tape may have ^{an appropriate density of less than 0.7 g/cm 2} , and excellent compression properties and shock absorption performance.

According to an exemplary embodiment of the present invention, the crosslinking agent induces crosslinking between the acrylic copolymer in the foam adhesive tape composition and crosslinking between the acrylic copolymer and the surfactant in the process of curing the foam adhesive tape composition, and the foam adhesive It may serve to enhance the adhesive performance of the tape.

According to an exemplary embodiment of the present invention, the content of the crosslinking agent may be 0.01 parts by weight or more and 0.5 parts by weight or less based on 100 parts by weight of the acrylic copolymer. Specifically, the content of the crosslinking agent is 0.03 parts by weight or more and 0.4 parts by weight or less, 0.05 parts by weight or more and 0.3 parts by weight or less, 0.05 parts by weight or more and 0.2 parts by weight or more, or 0.05 parts by weight or more and 0.1 parts by weight based on 100 parts by weight of the acrylic copolymer. It may be less than or equal to parts by weight. By adjusting the content range of the crosslinking agent to the above-mentioned range, while effectively improving the crosslinking density of the cured product of the foam adhesive tape composition, it is possible to suppress the deterioration of the adhesive performance of the foam adhesive tape. In addition, when the content range of the crosslinking agent is within the above range, heat resistance, cohesive strength, and weather resistance of the foam adhesive tape may be improved.

According to an exemplary embodiment of the present invention, by using a surfactant including a fluorinated oligomer containing a photoreactive functional group, the content of the crosslinking agent can be reduced compared to the case of using a conventional foam adhesive tape. Through this, it is possible to easily implement a foam adhesive tape having excellent bubble stability and excellent adhesion performance.

According to an exemplary embodiment of the present invention, as the crosslinking agent, those used in manufacturing the foam adhesive tape in the art can be used without limitation. For example, the crosslinking agent is hexanediol diacrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, propylene glycol diacrylate, dipropylene glycol diacrylate, and tripropylene. a diacrylate-based crosslinking agent comprising at least one of diacrylates; triacrylate-based crosslinking agent; aziridine-based crosslinking agent; and an epoxy-based crosslinking agent; may include at least one of

According to an exemplary embodiment of the present invention, by using the hollow filler, the foam adhesive tape composition can control physical properties such as peel strength, high temperature shear strength, and density of the foam adhesive tape including a cured product.

According to an exemplary embodiment of the present invention, as the hollow filler, those used when manufacturing a foam adhesive tape in the art can be used without limitation. For example, the hollow filler may include at least one of a trade name polymeric sphere expancel 551DU, a trade name glass macroballoon, a glass bubble, and a hollow silica, but the type of the hollow filler does not limit

According to an exemplary embodiment of the present invention, the content of the hollow filler may be 1 part by weight or more and 10 parts by weight or less based on 100 parts by weight of the acrylic copolymer. Specifically, the content of the hollow filler may be 3 parts by weight or more and 8.5 parts by weight or less, 5 parts by weight or more and 8 parts by weight or less, or 6 parts by weight or more and 7.5 parts by weight or less based on 100 parts by weight of the acrylic copolymer. By adjusting the content of the hollow filler to the above-described range, it is possible to disperse an appropriate number of pores in the foam adhesive tape, and it is possible to suppress the deterioration of the adhesive performance of the foam adhesive tape. In addition, when the content of the hollow filler is within the above range, the foam adhesive tape can be effectively reduced in weight, and the peel strength, high temperature shear strength and density of the foam adhesive tape can be controlled in an appropriate range.

According to an exemplary embodiment of the present invention, the content of the photoinitiator may be 0.1 parts by weight or more and 5 parts by weight or less based on 100 parts by weight of the acrylic copolymer. Specifically, the content of the photoinitiator may be 0.1 parts by weight or more and 3 parts by weight or less, 0.1 parts by weight or more and 1.5 parts by weight or less, or 0.2 parts by weight or more and 0.5 parts by weight or less with respect to 100 parts by weight of the acrylic copolymer. By adjusting the content of the photoinitiator to the above-mentioned range, it is possible to effectively induce photocuring of the foam adhesive tape composition. That is, the foam adhesive tape may include a photocured product of the foam adhesive tape composition.

According to an exemplary embodiment of the present invention, the photoinitiator may include at least one of a benzophenone-based photoinitiator, an acetophenone-based photoinitiator, a ketal-based photoinitiator, and a thioxanthone-based photoinitiator, but the type of the photoinitiator is not limited.

According to an exemplary embodiment of the present invention, the acrylic copolymer may be a copolymer of a monomer mixture including an alkyl group-containing (meth)acrylate monomer and a polar group-containing (meth)acrylate monomer. That is, the acrylic copolymer is an alkyl group-containing (meth) acrylate monomer unit derived from an alkyl group-containing (meth) acrylate monomer, and a polar group-containing (meth) acrylate monomer derived from the polar group-containing (meth) acrylate monomer. It may contain units.

In the present specification, the "alkyl group" may mean including a chain hydrocarbon structure in which an unsaturated bond does not exist in a functional group.

According to an exemplary embodiment of the present invention, the alkyl group-containing (meth) acrylate monomer is methyl (meth) acrylate, ethyl (meth) acrylate, n-propyl (meth) acrylate, isopropyl (meth) acrylate, n-butyl (meth)acrylate, t-butyl (meth)acrylate, sec-butyl (meth)acrylate, pentyl (meth)acrylate, 2-ethylhexyl (meth)acrylate, 2-ethylbutyl (meth)acrylate ) may include at least one of acrylate, n-octyl-5-(meth)acrylate, isooctyl (meth)acrylate, and 2-ethylhexyl (meth)acrylate.

According to an exemplary embodiment of the present invention, the polar functional group-containing monomer may include at least one of a hydroxyl group-containing monomer, a carboxyl group-containing monomer, and a nitrogen-containing monomer. When a carboxyl group-containing monomer is used as the polar functional group-containing monomer, crosslinking efficiency with the alkyl group-containing (meth)acrylate monomer and adhesive strength of the foam adhesive tape can be effectively improved.

According to an exemplary embodiment of the present invention, the hydroxyl group-containing monomer is 2-hydroxyethyl (meth) acrylate, 2-hydroxypropyl (meth) acrylate, 4-hydroxybutyl (meth) acrylate, 6-hydroxy It may include at least one of hydroxyhexyl (meth) acrylate, 8-hydroxyoctyl (meth) acrylate, 2-hydroxyethylene glycol (meth) acrylate, and 2-hydroxypropylene glycol (meth) acrylate. .

According to an exemplary embodiment of the present invention, the carboxyl group-containing monomer is acrylic acid, methacrylic acid, 2-(meth)acryloyloxy acetic acid, 3-(meth)acryloyloxypropyl acid, 4-(meth)acryloyl It may include at least one of yloxy butyric acid, acrylic acid duplex, itaconic acid, and maleic acid.

According to an exemplary embodiment of the present invention, the nitrogen-containing monomer is 2-isocyanatoethyl (meth) acrylate, 3-isocyanatopropyl (meth) acrylate, and 4-isocyanatobutyl (meth) ) may include at least one of acrylates.

According to an exemplary embodiment of the present invention, the content of the polar group-containing (meth)acrylate monomer may be 5 parts by weight or more and 20 parts by weight or less based on 100 parts by weight of the alkyl group-containing (meth)acrylate monomer. Specifically, the content of the polar group-containing (meth)acrylate monomer in the monomer mixture is 7.5 parts by weight or more and 18 parts by weight or less, 9 parts by weight or more and 15 parts by weight based on 100 parts by weight of the alkyl group-containing (meth)acrylate monomer. or less, 10 parts by weight or more and 12.5 parts by weight or less, or 10 parts by weight or more and 17.5 parts by weight or less. By adjusting the content of the polar group-containing (meth)acrylate monomer to the above-mentioned range, it is possible to improve the adhesive performance of the foam adhesive tape including the cured product of the foam adhesive tape composition, and the high temperature of the foam adhesive tape can be improved. It is possible to improve adhesion retention performance.

According to an exemplary embodiment of the present invention, the foam adhesive tape composition may further include an additive including at least one of a tackifier, a coupling agent, an antistatic agent, a dye, a pigment, a sunscreen, an antioxidant, and a processing oil. .

By using the tackifier, it is possible to improve the initial adhesiveness of the foam adhesive tape. The tackifier may include at least one of a rosin ester-based tackifier, a rosin-based tackifier, a terpene-based tackifier, and a petroleum resin-based tackifier.

By using the coupling agent, after the foam adhesive tape is attached to the adherend, even when exposed to heat, sunlight or temperature applied under outdoor conditions, it is possible to maintain the adhesive performance of the foam adhesive tape. A mixture of an amine-based silane and an epoxy silane may be used as the coupling agent.

The antistatic agent functions to prevent the generation of static electricity in the adherend to which the foam adhesive tape is used. As the antistatic agent, a known antistatic agent used in the art may be used. In addition, processing oil and the like may be added to improve cold resistance. The processing oil may include at least one of di-isobutyl phthalate (DIBP), di-octyl-phthalate (DOP), allyl ether-based oil, paraffin oil, and naphthalene-based oil, but the type of the processing oil is not limited thereto.

According to an exemplary embodiment of the present invention, the content of the additive may be adjusted within a range that does not reduce the physical properties of the foam adhesive tape, for example, the content of the additive is based on 100 parts by weight of the acrylic copolymer. It may be 0.01 parts by weight or more and 10 parts by weight or less.

An exemplary embodiment of the present invention provides a foam adhesive tape comprising a cured product of the foam adhesive tape composition. That is, the foam adhesive tape is an acrylic copolymer; photoinitiators; hollow filler; crosslinking agent; and a surfactant, wherein the surfactant includes a cured product of a foam adhesive tape composition comprising a fluorinated oligomer containing a photoreactive functional group.

The foam adhesive tape according to an exemplary embodiment of the present invention has the advantage of excellent adhesion and excellent bubble stability.

According to an exemplary embodiment of the present invention, the foam adhesive tape may have a density of less than ^{0.7 g/cm 2 .} Specifically, the density of the foam adhesive tape is 0.6 g / cm ² It may be more than 0.69 g/cm ² or less. Foam adhesive tape having a density satisfying the above-mentioned range has air bubbles properly dispersed therein, and thus may have excellent compression characteristics and shock absorption performance. In addition, when the density of the foam adhesive tape is within the above-described range, the foam adhesive tape may have an appropriate level of peel strength for the adherend.

According to an exemplary embodiment of the present invention, the density of the foam adhesive tape can be measured by adopting an apparatus and method for measuring the density of the tape member in the art without limitation. In the present invention, the density of the foam adhesive tape can be measured using a specific density meter (DME-220, SHINKO DENSHI). Specifically, the foam adhesive tape was cut to 25 mm in width and 25 mm in length to prepare a specimen, and then the weight of the specimen in general air and the weight of the specimen in water were measured, and the specific gravity difference was used to prepare the specimen. density can be found.

According to an exemplary embodiment of the present invention, the gel content of the foam adhesive tape may be 75% or more and 85% or less. That is, the gel content of the cured product of the foam adhesive tape composition may be 75% or more and 85% or less. By adjusting the gel content of the cured product of the foam adhesive tape composition to the above-mentioned range, the IPN structure of the polymer in the cured product can be sufficiently formed. Through this, it is possible to improve the high temperature stability of the foam adhesive tape, and it is possible to effectively prevent the adhesive force of the foam adhesive tape from being lowered.

According to an exemplary embodiment of the present invention, the gel content of the foam adhesive tape can be measured by adopting a method for measuring the gel content of a member in the art. In the present invention, the foam adhesive tape is cut to 25 mm in width and 25 mm in length to prepare a specimen, and then the weight (A) of the specimen is measured. Then, the specimen is immersed in ethyl acetate (EAC) solution for 1 day. After that, prepare a wire mesh cut to a size of 70 mm in width and 70 mm in length, measure the weight (B) of the wire mesh, filter the specimen immersed in the EAC solution using a wire mesh, and wash with a small amount of EAC solution, After drying in an oven at 110°C for 2 hours, the weight of the specimen (C) is measured. Then, through the following general formula 1, the gel content of the foam adhesive tape is calculated.

[General formula 1]

Gel content (%) = (C-B)/(A-B) x 100

In Formula 1, A is the initial weight of the specimen, B is the weight of the wire mesh, and C is the weight of the dried specimen.

According to an exemplary embodiment of the present invention, the foam adhesive tape has a shear strength of 10 kgf/in ^{2 at 90° C.} may be more than Specifically, the foam adhesive tape has a shear strength of 10 kgf/in ^{2 at 90 ° C.} more than 13 kgf/in ² Below, 10.1 kgf/in ² more than 12.8 kgf/in ² Below, 10.4 kgf/in ² more than 12.8 kgf/in ² or less, or 11 kgf/in ² more than 12.8 kgf/in ² may be below.

According to an exemplary embodiment of the present invention, since the foam adhesive tape has excellent high-temperature shear strength, it is attached to the final product and has excellent high-temperature reliability and durability.

1 schematically shows a method for measuring the high-temperature shear strength of a foam adhesive tape according to an embodiment of the present invention. Figure 1 (A) shows a specimen prepared for measuring the shear strength of the foam adhesive tape, and Figure 1 (B) shows the process of measuring the shear strength of the foam adhesive tape. More specifically, a sample was prepared by cutting the foam adhesive tape to a size of 25 mm X 25 mm, and two substrates (stainless steel with a width of 30 mm and a height of 70 mm) washed twice with ethyl acetate. , SUS version) are prepared. Thereafter, a sample is prepared by attaching a sample to one end of the SUS plate, attaching the opposite end of the other SUS plate to overlap the sample, and then pressing for 1 minute with a load of 6 kg. The prepared specimen was left at room temperature for 30 minutes, and the prepared specimen was placed in a chamber of a tensioner (Texture Analyzer XT Plus, Stable micro system, Inc.) equipped with a chamber controlled at 90° C. and left for 1 hour. The force when the foam adhesive tape breaks was measured by tensioning the specimen in the chamber at a rate of 1 mm/min, and the average value of the measured force for three specimens was calculated to obtain the high-temperature shear strength of the foam adhesive tape.

According to an exemplary embodiment of the present invention, the thickness of the foam adhesive tape may be 0.2 mm or more and 4 mm or less.

Hereinafter, examples will be given to describe the present invention in detail. However, the embodiments according to the present invention may be modified in various other forms, and the scope of the present invention is not to be construed as being limited to the embodiments described below. The embodiments of the present specification are provided to more completely explain the present invention to those of ordinary skill in the art.

Manufacture of foam adhesive tape

Example One

With respect to 100 parts by weight of 2-ethylhexyl acrylate (2-EHA), about 11.1 parts by weight of acrylic acid (AA) was mixed to prepare a monomer mixture. Then, 0.005 parts by weight of 1-hydroxycyclohexylphenyl ketone (Irgacure-184, BASF Corporation) as a photoinitiator was mixed with respect to 100 parts by weight of the monomer mixture, put into a 1 liter glass reactor, stirred, and then purged with nitrogen gas for 30 minutes The gas inside the solution was replaced with nitrogen. Thereafter, UV was irradiated using a black fluorescent lamp to prepare an acrylic copolymer. At this time, the viscosity of the acrylic copolymer was about 3000 cP at 25 °C.

Then, based on 100 parts by weight of the prepared acrylic copolymer, 0.2 parts by weight of Irgacure-651 (a,a-methoxy-a-hydroxyacetophenone) as a photoinitiator, 1,6-hexanediol diacrylate (HDDA) as a crosslinking agent ) After mixing 0.1 parts by weight, the mixture was sufficiently stirred. Then, based on 100 parts by weight of the acrylic copolymer, a total of 6 parts by weight of a hollow filler in which 4.5 parts of glass bubbles and 1.5 parts of hollow silica were mixed was added and stirred. After that, this mixture is degassed under reduced pressure using a vacuum pump and then using Frother, a surfactant with a weight average molecular weight of about 12,000 g/mol and an acrylate group as a photoreactive functional group as a surfactant based on 100 parts by weight of the acrylic copolymer. A foam adhesive tape was prepared by coating it with a thickness of 0.8 mm on the release film while injecting nitrogen gas together with 2 parts by weight of a fluorine oligomer (602A, NEOS) and passing it through an ultraviolet curing machine.

Example 2 to Example 6

A foam adhesive tape was prepared in the same manner as in Example 1, except that the contents of the surfactant and the crosslinking agent were adjusted with Table 1 below. In Table 1 below, 602A (NEOS) and 601AD (NEOS) are fluorinated oligomers containing an acrylate group as a photoreactive functional group, and FC4434 (3M) is a fluorine-based surfactant compound that does not contain a photoreactive functional group, L-5604 (Momentive) is a silicone-based surfactant compound that does not contain a photoreactive functional group.

comparative example 1 to comparative example 10

A foam adhesive tape was prepared in the same manner as in Example 1, except that the contents of the surfactant and the crosslinking agent were adjusted with Table 1 below. In Table 1 below, 710FL (NEOS) is a fluorine-based surfactant compound that does not contain a photoreactive functional group, and FC4434 (3M) and FC4430 (3M) are a fluorine-based surfactant compound that does not contain a photoreactive functional group, L -7230 (Momentive) and L-5604 (Momentive) are silicone-based surfactant compounds that do not contain a photoreactive functional group, and BYK-8020 (BYK-Chemical) is a silicone-based surfactant that does not contain a photoreactive functional group is a compound.

Surfactants
(parts by weight) crosslinking agent
(parts by weight) Example 1 602A
(2) HDDA
(0.1) Example 2 602A
(2) HDDA
(0.05) Example 3 601AD
(2) HDDA
(0.1) Example 4 602A
(One) FC4434
(One) HDDA
(0.07) Example 5 602A
(One) L-5604
(One) HDDA
(0.07) Example 6 602A
(4) HDDA
(0.1) Comparative Example 1 710FL
(2) HDDA
(0.1) Comparative Example 2 710FL
(2) HDDA
(0.05) Comparative Example 3 FC4434
(2) HDDA
(0.1) Comparative Example 4 FC4430
(2) HDDA
(0.1) Comparative Example 5 L-7230
(2) HDDA
(0.1) Comparative Example 6 L-5604
(2) HDDA
(0.1) Comparative Example 7 BYK-8020
(2) HDDA
(0.1) Comparative Example 8 - HDDA
(0.1) Comparative Example 9 602A
(6) HDDA
(0.1) Comparative Example 10 602A
(2) HDDA
(1.0)

In Table 1, the content of the surfactant and the crosslinking agent is based on 100 parts by weight of the acrylic copolymer (parts by weight).

Foam adhesive tape physical properties test

For the foam adhesive tapes prepared in Examples 1 to 6 and Comparative Examples 1 to 10, the density, the gel content, and the shear strength at 90° C. were measured using the above-described method, and the results are shown below. Table 2 shows.

In addition, with respect to the foam adhesive tapes prepared in Examples 1 to 6 and Comparative Examples 1 to 10, peel strength with respect to the SUS plate and the ABS plate, which are adherends, was measured as follows. Specifically, the SUS plate (SUS304) and the ABS plate having a width of 50 mm and a length of 150 mm were washed with an isopropyl solution and dried.

Then, the 0.8 mm thick foam adhesive tape formed on the 50 μm thick PET film, which is a release film, prepared in Examples 1 to 6 and Comparative Examples 1 to 10, is cut to 25 mm in width and 120 mm in length. to prepare a sample. A test specimen for peel strength was prepared by reciprocating and attaching the foam adhesive tape of the prepared specimen to the SUS and ABS plates with a 2 kg roller twice. After that, the prepared specimen was left at room temperature for 30 minutes, and using a tensioner (Texture Analyzer XT-Plus, Stable micro system), at a peeling rate of 300 mm/min and a peeling angle of 180 degrees at room temperature, foam adhesion The peel strength was measured while the tape was peeled off the adherend, and the average value of the peel strength measured for three specimens is shown in Table 2 below.

foam adhesive tape density
(g/cm ² ) gel content
(%) Peel strength (kgf/in) High temperature shear strength, 90℃
(kgf/in ² ) SUS ABS Example 1 0.64 83 2.4 2.1 11.2 Example 2 0.67 77.5 3.2 2.9 12.8 Example 3 0.67 81.3 2.2 2.0 10.4 Example 4 0.69 80.1 2.8 2.2 10.0 Example 5 0.68 79.5 2.9 2.3 10.1 Example 6 0.62 84.9 2.0 1.9 10.3 Comparative Example 1 0.70 78.3 2.2 2.2 9.2 Comparative Example 2 0.72 72.0 2.7 2.5 8.0 Comparative Example 3 0.70 79.1 2.2 2.1 8.5 Comparative Example 4 0.80 78.2 - - - Comparative Example 5 0.74 76.0 2.4 2.2 8.2 Comparative Example 6 0.72 78.8 2.3 1.9 8.4 Comparative Example 7 0.64 75.2 1.6 1.4 - Comparative Example 8 0.82 77.4 2.1 2.0 9.4 Comparative Example 9 0.56 84.2 1.5 1.2 8.7 Comparative Example 10 0.64 89 1.1 0.9 5.1

Referring to Tables 1 and 2, in the case of Examples 1 to 6 using a surfactant including a fluorinated oligomer containing an acrylate group as a photoreactive functional group, the content of the crosslinking agent is 100 parts by weight of the acrylic copolymer. can be controlled to 0.01 parts by weight or more and 0.5 parts by weight or less, through which the density is ^{less than 0.7 g/cm 2} , and the high-temperature shear strength at 90° C. is 10 kgf/in ² It was confirmed that the above foam adhesive tape can be implemented. In addition, it can be seen that the foam adhesive tapes of Examples 1 to 6 have excellent peel strength to the SUS substrate and the ABS substrate.

On the other hand, in the case of Comparative Examples 1 to 7 using a surfactant containing a compound not containing a photoreactive functional group, the density of the foam adhesive tape was 0.7 g/cm ² or more, and the high temperature shear strength of the foam adhesive tape was 10 It was confirmed that it was less than kgf/in ^{2 .} In addition, in the case of Comparative Example 8 that does not include a surfactant, the prepared foam adhesive tape has a density of 0.7 g/cm ² or more, and it can be confirmed that the high-temperature shear strength is inferior to that of the embodiment of the present invention.

In addition, the foam adhesive prepared in Comparative Example 9 in which the content of the surfactant exceeds 5 parts by weight based on 100 parts by weight of the acrylic copolymer and Comparative Example 10 in which the content of the crosslinking agent exceeds 0.5 parts by weight based on 100 parts by weight of the acrylic copolymer The tape has a high temperature shear strength of 10 kgf/in ² It can be seen that less than

Therefore, it can be seen that the foam adhesive tape composition according to an exemplary embodiment of the present invention can improve bubble stability in the foam adhesive tape and, at the same time, easily maintain the excellent adhesive performance of the foam adhesive tape.

Claims (13)

acrylic copolymer; photoinitiators; hollow filler; crosslinking agent; and a surfactant,
The surfactant includes a fluorinated oligomer containing a photoreactive functional group,
The content of the crosslinking agent is 0.01 parts by weight or more and 0.07 parts by weight or less based on 100 parts by weight of the acrylic copolymer,
The hollow filler includes glass bubbles and hollow silica,
The content of the hollow filler is 5 parts by weight or more and 8 parts by weight or less based on 100 parts by weight of the acrylic copolymer foam adhesive tape composition.
The method according to claim 1,
The content of the surfactant is 0.1 parts by weight or more and 5 parts by weight or less based on 100 parts by weight of the acrylic copolymer.
The method according to claim 1,
The photoreactive functional group of the fluorinated oligomer is a (meth) acrylate group foam adhesive tape composition.
The method according to claim 1,
The fluorinated oligomer is a foam adhesive tape composition comprising a monomer unit derived from a chain aliphatic monomer in which at least one fluorine is substituted on at least one carbon.
delete delete The method according to claim 1,
Foam adhesive tape composition further comprising air bubbles.
The method according to claim 1,
The content of the photoinitiator is 0.1 parts by weight or more and 5 parts by weight or less based on 100 parts by weight of the acrylic copolymer foam adhesive tape composition.
The method according to claim 1,
The acrylic copolymer is a foam adhesive tape composition in which a monomer mixture comprising an alkyl group-containing (meth)acrylate monomer and a polar group-containing (meth)acrylate monomer is copolymerized.
10. The method of claim 9,
The content of the polar group-containing (meth) acrylate monomer is 5 parts by weight or more and 20 parts by weight or less based on 100 parts by weight of the alkyl group-containing (meth) acrylate monomer.
A foam adhesive tape comprising a cured product of the foam adhesive tape composition according to claim 1.
12. The method of claim 11,
The foam adhesive tape is a foam adhesive tape having a density of less than ^{0.7 g/cm 2 .}
12. The method of claim 11,
The foam adhesive tape has a shear strength of 10 kgf/in ^{2 at 90 ° C.} More than foam adhesive tape.

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