KR101221253B1 - Photocurable primer composition for coating melamine - Google Patents

Abstract

The photocurable prima composition used in the LPM of the present invention can be more easily coated on the adherend, so that the adhesion with the adherend, water resistance, heat resistance, and solvent resistance are superior to those of the conventional oil-based prima composition. In addition, it has the effect of excellent workability, economical and environmental aspects. To this end, in particular, 1 to 30 parts by weight of the urethane (meth) acrylate prepolymer, based on the total weight of the photocurable priming composition used in the LPM; 1 to 10 parts by weight of epoxy (meth) acrylate prepolymer; 10 to 60 parts by weight of (meth) acrylate monomer; Extender pigment 1 to 10 parts by weight; And a photoinitiator 0.1 to 10 parts by weight; disclosed is a photocurable priming composition used in the LPM.

Description

Photocurable primer composition for coating melamine

The present invention relates to photocurable priming compositions used in LPMs. More specifically, the present invention relates to a photocurable priming composition used in an LPM having excellent adhesion to water and water resistance and heat resistance.

In general, low pressure melamine (LPM) used in interior and exterior materials, interior furniture, furniture is very dense, very strong against acids and alkali, has a high strength and high scratch resistance. On the other hand, the typical melamine coating method is sand paper (320 ~ 400 neck) to polish the surface of the adherend, apply a two-component urethane isolator on the surface of the adherend, volatilize the diluent, and coat the UV-curable paint using a roll coater Is done.

This melamine coating method requires a pretreatment process for facilitating adhesion, and this pretreatment process is mainly carried out with sand paper (320 ~ 400 neck). However, there is a problem that a serious failure in the adhesion-related properties if the operator does not perform the pretreatment process by mistake. In addition, after the pretreatment, the two-component urethane isolator is applied and heated to volatilize the organic solvent, and then the organic solvents contained in the solvent-type coating in the process of coating the UV curable paint using a roll coater are volatile organic compounds ( VOC's) caused environmental pollution, and the smell was too bad to harm the health of workers. Therefore, foreign countries are receiving preparations for the use of these organic solvents in accordance with various environmental laws, and attempts to reduce the organic solvent content in accordance with environmental protection programs centered on developed countries continue. On the other hand, due to the high temperature drying method of heating and volatilizing the organic solvent has a disadvantage of severe energy consumption.

Accordingly, there is a need for a photocurable priming composition for use in LPM that does not generate volatile organic compounds by using a photocurable prima and not undergoing a polishing process and drying after application of the photocurable prima.

In addition, by providing a simpler coating, it is not only excellent in adhesion to the adherend, water resistance and heat resistance, but also photocurable plastic used in LPM with excellent workability, economical and environmental superiority. There is a need for a forehead composition.

On the other hand, there is a need for a photocurable priming composition to be used in LPM that can improve productivity based on photocurable primas at 100% solids having no volatile content.

The present invention was created by the above needs, and the first object of the present invention is to use a photocurable prima and not undergo a polishing process and a drying process after application of the photocurable prima, thereby not generating volatile organic compounds. It is to provide a photocurable priming composition used in.

In addition, the second purpose is to make the coating simpler, so that it is excellent in adhesion with the adherend, water resistance, and heat resistance, as well as excellent workability, economical and environmental superiority in LPM. It is to provide a photocurable prima composition.

On the other hand, it is to provide a photocurable priming composition to be used in the LPM that can improve productivity based on the photocurable prima at 100% solids with no volatile content.

The object of the present invention as described above is 1 to 30 parts by weight of the urethane (meth) acrylate prepolymer, based on the total weight of the photocurable priming composition used in the LPM; 1 to 10 parts by weight of epoxy (meth) acrylate prepolymer; 10 to 60 parts by weight of (meth) acrylate monomer; Extender pigment 1 to 10 parts by weight; And 0.1 to 10 parts by weight of a photoinitiator. It can be achieved by providing a photocurable priming composition for use in the LPM.

In addition, the photocurable prima composition used in the LPM, 0.1 to 10 parts by weight of ester ester; may be characterized in that it further comprises.

The photocurable priming composition used in the LPM may have a glass transition temperature of 20 to 40 ° C.

According to one embodiment of the present invention, the photocurable primer composition used in the LPM of the present invention does not generate a volatile organic compound by coating and drying after the coating of the photocurable prima at the time of coating. There is.

In addition, the photocurable prima composition used in the LPM of the present invention can be more easily coated on the adherend, so that adhesion to the adherend, water resistance, heat resistance, and solvent resistance are higher than those of the conventional oil type prima composition. Not only is it excellent, it also has the effect of excellent workability, economical and environmental aspects.

In addition, the photocurable prima composition used in the present invention LPM has the effect that can be reproduced in the form of a printed matter printed on the adherend.

In addition, the photocurable priming composition used in the LPM of the present invention has an effect of improving productivity based on the photocurable prima at 100% solids having no volatile content.

Hereinafter, preferred embodiments of the present invention will be described in detail. In addition, in the following description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted.

The photocurable prima composition (hereinafter referred to as prima composition) used in the present invention LPM is urethane (meth) acrylate prepolymer, epoxy (meth) acrylate prepolymer, (meth) acrylate monomer, photoinitiator, extender pigment, phosphorus It consists of ester acrylate.

The primer composition of the present invention uses a mixture of two prepolymer-urethane (meth) acrylate prepolymers and an epoxy (meth) acrylate prepolymer. Here, the urethane (meth) acrylate prepolymer uses a urethane (meth) acrylate prepolymer having an average molecular weight of 100,000 or more. On the other hand, the urethane (meth) acrylate prepolymer is soft and has good adhesion, but the coating layer has a large strength, which causes a problem of scratches from external pressure or impact. In addition, the epoxy (meth) acrylate prepolymer is excellent in curability and high in hardness, so there is a problem of breaking in external impact and poor adhesion. Therefore, the present inventors use a mixture of the two prepolymers to secure the disadvantages of the two prepolymers to each other and maximize the advantages.

Here, the two prepolymers may be mixed in an amount of 1 to 30 parts by weight of a urethane (meth) acrylate prepolymer and 1 to 10 parts by weight of an epoxy (meth) acrylate prepolymer, based on the total weight of the priming composition. If the urethane (meth) acrylate prepolymer exceeds 30 parts by weight, the strength of the cured coating film is too low, the degree of curing is poor, and the heat resistance is poor, and if less than 1 part by weight, the problem of poor adhesion occurs. If the epoxy (meth) acrylate prepolymer is more than 10 parts by weight, the hardness of the cured coating film becomes too high and the elongation is low, thereby easily cracking the external impact, and if it is less than 1 part by weight, the solvent resistance and strength are poor. do.

On the other hand, the (meth) acrylate monomer included in the prima composition of the present invention is hydroxyethyl (meth) acrylate diethylaminoethyl (meth) acrylate, dimethylaminoethyl (meth) acrylate, t-octyl (meth) Acrylate, N, N-dimethyl (meth) acrylate, N-vinyl caprolactam, N-vinylpyrrolidone, isobutoxy (meth) acrylamide, diacetone (meth) acrylamide, carbonyl (meth) acrylate, Isobonyl (meth) acrylate, tricyclodecanyl (meth) acrylate, dicyclopentanyl (meth) acrylate, dicyclopentadiene (meth) acrylate, methoxypolypropylene glycol (meth) acrylate, methoxy Polyethylene glycol (meth) acrylate, ethoxyethoxyethyl (meth) acrylate, methoxyethylene glycol (meth) acrylate, polypropylene glycol mono (meth) acrylate, poly Liethylene glycol mono (meth) acrylate, phenoxyethyl (meth) acrylate, cyclohexyl (meth) acrylate, benzyl (meth) acrylate, epoxy diethylene glycol (meth) acrylate, butoxyethyl (meth) ) Acrylate, tetrahydrofurfuryl (meth) acrylate, styryl (meth) acrylate, octadecyl (meth) acrylate, lauryl (meth) acrylate, dodecyl (meth) acrylate, isodecyl (meth) ) Acrylate, nonyl (meth) acrylate, 2-ethylhexyl (meth) acrylate, isoamyl (meth) acrylate, t-butyl (meth) acrylate, isobutyl (meth) acrylate, butyl (meth) Acrylate, isopropyl (meth) acrylate, propyl (meth) acrylate, ethyl (meth) acrylate, methyl (meth) acrylate or mixtures thereof, and the like are preferred. As the polyfunctional monomer, trimethylol Ropan tri (meth) acrylate, pentaerythritol tri (meth) acrylate, ethylene glycol di (meth) acrylate, 1,6-hexanediol di (meth) acrylate, tripropylene glycol diacrylate, trimethylolpropane At least one polyfunctional monomer selected from the group consisting of trioxyethyl (meth) acrylate and tricyclodecanedimethanoldiacrylate can be used.

In addition, the (meth) acrylate monomer may include 10 to 60 parts by weight based on the total weight of the priming composition. This is because when the (meth) acrylate monomer exceeds 60 parts by weight, the strength of the cured coating film becomes too low, the degree of curing is poor, and the heat resistance is poor, and when it is less than 10 parts by weight, the problem of poor adhesion occurs. .

The prima composition of the present invention comprises a photoinitiator. In general, the photocurable prima composition should be cured by irradiation with ultraviolet rays. Ultraviolet lamps emit a short wavelength region and a long wavelength region at the same time and should be made of a photocurable priming composition that can be cured in the wavelength region. Thus, the choice of photoinitiator in the prima composition of the present invention is important. On the other hand, photoinitiators included in the prima composition in the present invention 1-hydroxycyclohexylphenyl ketone, 2,2-dimethoxy-2-phenyl-acetophenone, benzaldehyde, anthraquinone, 3-methylacetophenone, 4- Chlorobenzophenone, 4,4'-dimethoxybenzophenone, benzoinpropyl ether, benzoin ethyl ether, 1- (4-isopropyl-phenol) -2-hydroxy-2-methylpropan-1-one, thio Xanthone, benzophenone, 2,4,6-trimethylbenzoyl-diphenylphosphine, etc. can be used, Two or more types of these can also be mixed and used.

Here, the photoinitiator may include 0.1 to 10 parts by weight based on the total weight of the priming composition.

The extender pigment contained in the prima composition of the present invention is used to improve the coating film hardness and the like. The extender pigments used in the present invention are asbestos, alumina, kaolin clay, finely divided silicate, wollastonite, quartz powder (printo), calcium carbonate, magnesium carbonate, talc, feldspar powder, mica, silica, glass beads, ceramics, and diamond mixtures. At least one selected from the group consisting of.

In addition, the extender pigment may include 1 to 10 parts by weight based on the total weight of the priming composition. This is because when the extender pigment is more than 1 part by weight, the transparency of the coating layer is lowered, and when the extender pigment is less than 10 parts by weight, the coating film hardness is lowered.

In addition, the prima composition of the present invention may further comprise 0.1 to 10 parts by weight of phosphate acrylate. In addition, the prima composition of the present invention may further include a silane coupling agent, a thermal polymerization inhibitor, a leveling agent, a surfactant, an antifoaming agent, and the like.

On the other hand, it is preferable that the glass transition temperature of the photocurable primer composition used for the LPM of this invention is 20-40 degreeC.

Hereinafter will be described in more detail the present invention the prima composition through examples and comparative examples of the present invention. However, the following examples and comparative examples are provided only to more easily understand the present invention, and the present invention is not limited to the following examples.

Example 1

A photocurable prima composition used in the LPM of Example 1 was prepared in the following composition.

30 weight% of urethane (meth) acrylate prepolymer, 10 weight% of epoxy (meth) acrylate prepolymer, 24 weight% of hydroxy ethyl (meth) acrylate, 20 weight% of isobornyl methacrylate, photoinitiator in the reactor with a stirrer After mixing 5% by weight, 10% by weight of extender pigment, 1% by weight of ester acrylate, and stirred at 500 rpm for 30 minutes, and vacuum degassing for 10 minutes while maintaining 25 ° C to completely remove air bubbles, and then used for LPM A flaming prima composition was prepared.

Example 2

A photocurable prima composition used in the LPM of Example 2 was prepared in the following composition.

10 weight% of urethane (meth) acrylate prepolymers, 30 weight% of epoxy (meth) acrylate prepolymers, 24 weight% of hydroxy ethyl (meth) acrylates, 20 weight% of isobornyl methacrylates, and photoinitiator in the reactor with a stirrer After mixing 5% by weight, 10% by weight of extender pigment, 1% by weight of ester acrylate and stirring at 500 rpm for 30 minutes, and vacuum degassing for 10 minutes while maintaining 25 ℃, the bubble used for LPM A flaming prima composition was prepared.

Comparative Example 1

A photocurable prima composition used in the LPM of Comparative Example 1 was prepared in the following composition.

30 wt% of urethane (meth) acrylate prepolymer, 10 wt% of epoxy (meth) acrylate prepolymer, 44 wt% of trimethylolpropanetriacrylate, 5 wt% of photoinitiator, 10 wt% of sieving pigment, phosphorus in reactor with stirrer After mixing 1% by weight of ester acrylate at 500rpm for 30 minutes, vacuum degassing for 10 minutes while maintaining at 25 ℃ completely remove the bubbles, to prepare a photo-curable prima composition used in the LPM.

Comparative Example 2

A photocurable prima composition used in the LPM of Comparative Example 2 was prepared in the following composition.

30 weight% of urethane (meth) acrylate prepolymer, 10 weight% of epoxy (meth) acrylate prepolymer, 25 weight% of hydroxy ethyl (meth) acrylate, 20 weight% of isobornyl methacrylate, photoinitiator in the reactor with a stirrer After mixing 5% by weight, 10% by weight of the extender pigment and stirred at 500rpm for 30 minutes, vacuum degassing for 10 minutes while maintaining 25 ℃ to completely remove the bubbles, to prepare a photo-curable prima composition used for LPM.

The photocurable prima composition used in the LPM prepared by Example 1, Example 2, Comparative Example 1 and Comparative Example 2 as described above using an applicator on a low pressure melamine plate 25㎛ After coating to a thickness of 30mJ / ㎠ by irradiating the light amount of 300mJ / ㎠ light curing, and then coated with UV curable type and medium, and completely cured to 100mJ / ㎠ light quantity using a light irradiator, sand paper (400 After the polishing using the neck), the UV-curable high-gloss paint was coated, and then completely cured at 1000 mJ / cm 2 using a light irradiator to measure physical properties (adhesiveness, water resistance, and heat resistance).

Here, the adhesion was measured by the method of ASTM D 3359-87, the water resistance was immersed in room temperature water for 2 hours to observe the change of the coating film, and the heat resistance was stored for 2 hours at -20 ℃ and stored for 2 hours at 60 ℃ The change of the coating film was measured 10 times. The measurement results are summarized in Table 1 below.

division Example 1 Example 2 Comparative Example 1 Comparative Example 2 Adhesion 100/100 85/100 70/100 90/100 Water resistance Good usually Bad usually Cold resistance Good Bad Bad Good Glass transition temperature (Tg, ℃) 30 50 45 25

As shown in the measurement results of Table 1, it can be seen that the adhesion difference is remarkable according to the mixing ratio of the urethane (meth) acrylate prepolymer and the epoxy (meth) acrylate prepolymer. And it turns out that phosphate acrylate has a big influence on adhesiveness. In addition, it can be seen that the glass transition temperature also greatly affects the adhesion.

Claims (3)

1 to 30 parts by weight of a urethane (meth) acrylate prepolymer;
1 to 10 parts by weight of epoxy (meth) acrylate prepolymer;
10 to 60 parts by weight of (meth) acrylate monomer;
Extender pigment 1 to 10 parts by weight;
0.1 to 10 parts by weight of photoinitiator; And
Including ester 0.1 to 10 parts by weight; including,
The extender pigment is selected from the group consisting of asbestos, alumina, kaolin clay, fine silicate, wollastonite, quartz powder (printo), calcium carbonate, magnesium carbonate, talc, feldspar powder, mica, silica, glass beads, ceramics, and diamond mixtures. Made up of at least one,
Melamine coating photocurable primer composition, characterized in that the glass transition temperature is 20 to 40 ℃. delete delete