KR102526742B1 - Tape having excellent adhesion and impact resistant - Google Patents

Abstract

The disclosed content relates to a tape having excellent reworkability and improved adhesive strength and impact resistance by replacing conventionally used acrylate oligomers with urethane acrylate oligomers.
The tape having excellent adhesion and impact resistance includes 100 parts by weight of a mixture of 5 to 95% by weight of urethane acrylate oligomer and 95 to 5% by weight of acrylate monomer, 0.01 to 10 parts by weight of photoinitiator, and 0.01 to 30 parts by weight of hollow particles. .

Description

Tape with excellent adhesion and impact resistance {TAPE HAVING EXCELLENT ADHESION AND IMPACT RESISTANT}

Disclosed herein relates to a tape having excellent adhesion and impact resistance prepared using a urethane acrylate oligomer.

Unless otherwise indicated herein, material described in this section is not prior art to the claims in this application, and inclusion in this section is not an admission that it is prior art.

In general, non-solvent type tapes are widely used in various fields such as electronic parts, architecture, automobiles, and medical products, and are manufactured through methods such as hot melt, solution and emulsion polymerization, and photopolymerization by ultraviolet (UV) irradiation. In particular, tape manufacturing technology by photopolymerization or curing reaction has recently attracted more attention because of its relatively environmentally friendly and rapid curing compared to conventional polymerization methods, and its process characteristics such as low power consumption and curing temperature.

As an example of such technology, Patent Document 1 discloses an acrylic foam tape having an acrylic photopolymerizable adhesive layer, and Patent Document 2 discloses a first alkyl (meth)acrylate having an alkyl group having 4 to 15 carbon atoms and a carbon number 1 to 3 Disclosed is a pressure-sensitive adhesive composition including a photopolymerizable resin formed from a mixed monomer component including a second alkyl (meth)acrylate having an alkyl group and acrylic acid.

In the case of Patent Documents 1 and 2 described above, there is a problem in that it is difficult to implement a high level of adhesive strength by being composed of an acrylic resin.

Republic of Korea Patent No. 10-1099602 (2011.12.21) Republic of Korea Patent Registration No. 10-2076119 (2020.02.05)

It is intended to provide a UV curable tape having a high level of adhesiveness and excellent impact resistance.

In addition, it is not limited to the technical problems as described above, and it is obvious that other technical problems may be derived from the following description.

According to one embodiment of the disclosed subject matter, the tape having excellent adhesiveness and impact resistance includes 5 to 95% by weight of a urethane acrylate oligomer; 100 parts by weight of a mixture of 95 to 5% by weight of an acrylate monomer and 0.01 to 10 parts by weight of a photoinitiator do.

In addition, the urethane acrylate oligomer is obtained by polymerizing a polyurethane prepolymer with polypropylene glycol having a weight average molecular weight of 300 to 8000 g/mol and one isocyanate selected from isophorone diisocyanate and xylylene diisocyanate. One monofunctional acrylate monomer containing a hydroxyl group selected from 2-hydroxyethyl methacrylate, 2-hydroxyethyl acrylate, 4-hydroxybutyl acrylate, and 2-hydroxypropyl acrylate, or It may be prepared by a capping reaction with a multifunctional acrylate monomer.

In addition, the photoinitiator may include at least one selected from 2,2-dimethoxy-1,2-diphenylmethane-1-one and 1-hydroxy-cyclohexyl-phenyl-ketone.

In addition, with respect to 100 parts by weight of the mixture, 0.01 to 30 parts by weight of hollow particles may be further included.

According to one embodiment disclosed in the present specification, a tape having excellent adhesive strength and impact resistance has an effect of improving reworkability and adhesive strength by replacing conventionally used acrylate oligomers with urethane acrylate oligomers.

In addition, there is an effect of improving impact resistance by further using hollow particles.

Hereinafter, with reference to the accompanying drawings, look at the configuration and operation effects of preferred embodiments of the disclosure. For reference, in the drawings below, each component is omitted or schematically illustrated for convenience and clarity, and the size of each component does not reflect the actual size. In addition, like reference numerals refer to like components throughout the specification, and reference numerals for like components in individual drawings will be omitted.

In the case of manufacturing an impact-resistant tape by UV coating, an acrylate oligomer is usually used, but in this case, there is a problem of poor reworkability and impact resistance. Accordingly, in the present specification, urethane acrylate oligomer was used instead of acrylate oligomer to improve reworkability as well as adhesiveness, and hollow particles were further used to improve impact resistance, thereby solving the conventional problems.

A tape having excellent adhesive strength and impact resistance according to an embodiment of the present disclosure may be formed to a thickness of 10 to 200 μm, preferably 50 μm, and may satisfy an adhesive strength ranging from 1000 to 3100 gf/in. Such a tape having excellent adhesion and impact resistance includes (1) a urethane acrylate oligomer, (2) an acrylate monomer, and (3) a photoinitiator. Further, (4) hollow particles are further included. Specifically, 100 parts by weight of a mixture of 5 to 95% by weight of a urethane acrylate oligomer and 95 to 5% by weight of an acrylate monomer, and 0.01 to 10 parts by weight of a photoinitiator, and may further include 0.01 to 30 parts by weight of hollow particles. .

(1) Urethane Acrylate Oligomer

Urethane acrylate oligomer has 2 to 12 functional groups and is a material with excellent adhesion.

In this embodiment, the urethane acrylate oligomer has a weight average molecular weight (Mw) of 4,000 g / mol to 200,000 g / mol, and a weight average molecular weight of 300 g / mol to 8,000 g / mol Polypropylene glycol and isophorone Polyurethane prepolymer is polymerized by reacting with one isocyanate selected from Isophorone Diisocyanate (IPDI) and Xylylene Diisocyanate (XDI), followed by 2-hydroxyethyl methacrylate (2-Hydroxyethylmethacrylate), One single group containing a hydroxyl group selected from 2-hydroxyethylacrylate, 4-hydroxybutylacrylate, and 2-hydroxypropylacrylate It may be prepared by a capping reaction with a functional acrylate monomer or a multifunctional acrylate monomer.

The urethane acrylate oligomer may be included in an amount of 5 to 95% by weight based on the total weight% of the mixture. If the content of the urethane acrylate oligomer is less than 5% by weight, sufficient crosslinking cannot be performed and residues are increased, and if the content exceeds 95% by weight, the adhesive force cannot satisfy 1000 gf / in or more.

When the above-mentioned content is satisfied, it is possible to implement an adhesive strength in the range of 1000 to 3100 gf / in, and may have excellent reworkability.

(2) Acrylate monomer

Acrylate monomers include 2-Ethylhexylacrylate, Ethylacrylate, Methylacrylate, Butylacrylate, Ethylmethacrylate, and Methylmethacrylate ( Methylmethacrylate), n-propylmethacrylate, Isobornylacrylate, 2-Ethoxyethylmethacrylate, 2-Hydroxyethylmethacrylate , And at least one selected from acrylic acid may be used, and it is possible to implement an impact-resistant tape having a high degree of photocuring and improved adhesiveness by adjusting the mixing weight ratio.

These acrylate monomers may be included in an amount of 95 to 5% by weight based on the total weight% of the mixture. If the content of the acrylate monomer is less than 5% by weight, sufficient adhesive force cannot be obtained, and if it exceeds 95% by weight, sufficient crosslinking is not performed and residues remain.

(3) Photoinitiator

The photoinitiator initiates after generating radicals by absorbing light, and serves to polymerize urethane acrylate oligomers or acrylate monomers by UV irradiation, 2,2-dimethoxy-1,2-di Phenylmethane-1-one (2,2-Dimethoxy-1,2-diphenylethan-1-one), and 1-hydroxy-cyclohexyl-phenyl-ketone (1-Hydroxy-cyclohexyl-phenyl-ketone) At least one can be used.

The photoinitiator may be included in an amount of 0.01 to 10 parts by weight based on 100 parts by weight of the mixture. This is because if the content of the photoinitiator is less than 0.01 parts by weight, the photocuring reaction of the acrylate monomer proceeds slowly and productivity may decrease. It may deteriorate or change physical properties.

(4) hollow particles

The hollow particles may be obtained by coating the surfaces of hollow microspheres made of an acrylonitrile-based copolymer with an inorganic powder. The average particle diameter of these hollow particles is in the range of 1 to 100 μm, and the impact resistance can be improved by absorbing impact applied from the outside by having a hollow middle part. The number average particle diameter or shape is not limited to the range and shape mentioned above, and any range and shape that can improve impact resistance can be applied.

In the present specification, hollow particles collectively refer to particles having empty spaces on the surface or inside of organic or inorganic particles.

These hollow particles may be included in an amount of 0.01 to 30 parts by weight based on 100 parts by weight of the mixture. If the hollow particles are less than 0.001 parts by weight, the impact resistance improvement effect may be insignificant, and if it exceeds 30 parts by weight, it is difficult to control the roughness of the tape surface during coating, and the viscosity of the compound is excessively increased. It may be difficult to achieve the desired thickness. In addition, an excessive amount of hollow particles may act as an obstacle to implementing high adhesive strength.

<Examples 1 to 4>

After mixing with the composition and content shown in Table 1 below, the release paper was coated to a thickness of 50 μm and UV cured to prepare a tape.

The contents of each composition in Table 1 are parts by weight.

division Example 1 Example 2 Example 3 Example 4 Urethane Acrylate Oligomers Based on XDI 50 50 - - Urethane Acrylate Oligomers Based on IPDI - - 50 50 acrylate monomer 50 50 50 50 photoinitiator 0.1 0.1 0.1 0.1 hollow particle - 2 - 2

<Comparative Example 1>

After mixing 100 parts by weight of a mixture of 2-ethylhexyl acrylate and acrylic acid and 0.5 parts by weight of a photoinitiator (2,2-dimethoxy-1,2-diphenylmethane-1-one), UV irradiation was performed to prepare an acrylic partial polymer. . In addition, 100 parts by weight of the acrylic partial polymer, 0.2 parts by weight of the polyfunctional acrylate monomer, and 0.1 part by weight of the photoinitiator were mixed, coated with a release paper to a thickness of 50 μm, and UV cured to prepare a tape.

<Comparative Example 2>

A tape was prepared in the same manner and content as in Comparative Example 1, except that 2 parts by weight of hollow particles were additionally used.

Experimental Example 1. Evaluation of physical properties

In order to confirm the physical properties of Examples 1 to 4 and Comparative Examples 1 to 2, adhesion, reworkability and impact resistance were measured, respectively, and the results are shown in Table 2.

Adhesion was measured using a universal testing machine (UTM) (Texture Analyzer XT Plus, Stable micro systems) according to ASTM D 3330. Five specimens were attached to a stainless steel substrate by reciprocating rolling twice with a 2kg roller each, and left at room temperature for 30 minutes, then the specimens were peeled from the stainless steel substrate under the conditions of a peeling speed of 300mm/min and a peeling angle of 180°. The adhesive strength was measured while doing so, and the average value thereof was calculated and displayed.

Reworkability is good if the specimen can be removed by pulling it by hand when removing the specimen from the stainless steel substrate after a certain period of time has elapsed after attaching the specimen to the stainless steel substrate. It was measured as bad.

For push-out impact resistance, a specimen having a width of 15.5 mm × length of 15.5 mm × thickness of 0.7 mm was attached, and the force at the time of detachment was measured by compressing (5 Bar × 5 sec) the specimen at a rate of 10 mm/min.

For vertical impact resistance and shear impact resistance, a DuPont impact tester was used. A specimen with a width of 15.5 mm × length of 15.5 mm × thickness of 0.7 mm was attached, and when a load of 50 to 1000 g was dropped from a certain height, the kinetic energy at the height at which the specimen was separated was calculated, and the compression condition was 5 bar × 5 sec.

division Example comparative example One 2 3 4 One 2 Adhesion (gf/in) 1160 1080 3009 2635 391 41 reworkability Good Good Good Good bad bad impact resistance Push-out
(kgf) 4.6 8.6 10.2 12.65 5.18 3.86 Dupont Vertical
(mJ) 24.5 98 106 114 49 49 Dupont shear (mJ) 49 122.5 82 114 82 98

Referring to Table 2, it was confirmed that the most suitable performance could be implemented in the case of Examples 1 to 4. On the other hand, in Comparative Examples 1 and 2, as in Examples 1 to 4, urethane acrylate oligomer was not used, so the adhesive strength was lower than the standard, and after removing the tape from the stainless steel substrate, a lot of residues were left on the stainless steel substrate. However, it was very difficult to remove the tape from the stainless steel substrate itself.

The disclosed content is only an example, and can be variously modified and implemented by those skilled in the art without departing from the subject matter of the claim claimed in the claims, so the protection scope of the disclosed content is limited to the specific It is not limited to the examples.

Claims (5)

40 to 60% by weight of a urethane acrylate oligomer; 100 parts by weight of a mixture of 60 to 40% by weight of an acrylate monomer; and 0.01 to 10 parts by weight of a photoinitiator; and 0.01 to 30 parts by weight of hollow particles,
The urethane acrylate oligomer is obtained by polymerizing a polyurethane prepolymer by reacting polypropylene glycol having a weight average molecular weight of 300 to 8000 g/mol with xylylene diisocyanate, and then 2-hydroxyethyl methacrylate and 2-hydroxyethyl acrylate , 4-hydroxybutyl acrylate, and 2-hydroxypropyl acrylate prepared by a capping reaction with one monofunctional acrylate monomer or multifunctional acrylate monomer containing a hydroxy group selected from,
The acrylate monomer is ethyl acrylate, methyl acrylate, butyl acrylate, ethyl methacrylate, methyl methacrylate, n-propyl methacrylate, 2-ethoxyethyl methacrylate, 2-hydroxyethyl methacrylate A tape having excellent adhesive strength and impact resistance, characterized in that it is a tape having excellent adhesive strength and impact resistance, characterized in that it contains at least one selected from latex and acrylic acid.
delete delete According to claim 1,
The photoinitiator comprises at least one selected from 2,2-dimethoxy-1,2-diphenylmethane-1-one and 1-hydroxy-cyclohexyl-phenyl-ketone, Tape with excellent impact resistance.
delete