KR100507537B1 - Matting agent Suitable for UV Curing Coating Material and Method for Manufacturing the Same - Google Patents

Abstract

The present invention relates to a paint matting agent suitable for ultraviolet curing and a method for producing the same. In the present invention, 10 to 20% by weight of synthetic polyolefin wax having a melting point (DSC) of 100 to 130 ° C, 80 to 95% of crystallinity (X-ray diffractometry), and a number average molecular weight (GPC) of 3000 to 8000; 80 to 90% by weight of an organic solvent selected from xylene, toluene, alcohols, ketones, and mixtures thereof; mixed and melted; the slurry obtained by cooling to 30 ° C. or lower is passed through a wet bead mill apparatus to have an average particle diameter of 2.0 to 6.0. There is provided a matting agent suitable for an ultraviolet curable coating material, characterized in that it is dispersed in fine particles of micrometer. According to the present invention, it is possible to obtain a matting agent which is excellent in matting and abrasion resistance and exhibits excellent sedimentation stability among UV curable paints having low viscosity.

Description

Matting agent Suitable for UV Curing Coating Material and Method for Manufacturing the Same

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a matting agent suitable for ultraviolet curable paints and a method for producing the same, and more particularly to a matting agent excellent in workability, matting and abrasion resistance obtained by dispersing polyolefin wax into fine particles.

Currently, thermoplastic materials such as vinyl chloride, acrylic, polycarbonate, polyester, polyamide, and the like are widely used in the form of various film and sheet moldings. Increasingly, usage is increasing.

On the other hand, these thermoplastic materials have poor surface hardness and wear resistance and must be coated to protect the plastic surface. Among various surface protective coatings, UV curable paints are attracting industrial attention due to their short reaction time, high energy efficiency, low curing temperature, proper equipment space requirements, and low operating costs. Due to the advantages that can be raised, demand for cell phone cases, cosmetic cases, and woodworking is gradually increasing.

On the other hand, UV curable paints, in addition to the purpose of protecting the plastic surface, it is important to select a matting agent that is an additive used to reduce the reflection of light on the plastic surface to reduce the gloss of the coating. The known techniques for the matting agent currently used in UV-curable paints are listed as follows.

First, a coating matting agent using silica is described in US Pat. Nos. 6,395,247 and 6,103,004. The matting agent using such a silica powder is possible for paints with high viscosity, but is unsuitable for UV-curable paints with low viscosity. The reason is that even if the inorganic silica powder is dispersed in the UV-curable paint having a low viscosity, there is a disadvantage that it is precipitated after some time, and since the silica powder is directly used, fine powder is blown and there is a problem of poor workability.

Secondly, matting agents for paints based on wax-impregnated silica are described in German Patents 1,006,100 and 1,592,865 and European Patents 10,922,691. This wax emulsion is coated with a silica suspension and, if necessary, with a dispersant. This impregnated or coated silica has to be dried at considerable cost and still has the disadvantage of containing a dispersant and is not suitable for UV-curable paints with low viscosity.

Fifth, when the polyolefin micro powder wax is directly used as a UV curable paint matting agent, there is a problem in that it is difficult to use due to the disadvantage of poor matting and poor surface adhesion.

Therefore, in the present invention, in order to solve the above problems, it is excellent in workability, matting and abrasion resistance when added to the UV-curable paint, coating the coating, especially when used in a low-viscosity UV curable paint The purpose is to provide a matting agent that exhibits sedimentation stability.

In order to obtain the matting agent as described above, the present invention is to select and use a synthetic polyolefin wax having a certain range of physical properties, and to provide a method for dispersing the polyolefin wax into fine particles of a certain size.

In the present invention, 10 to 20% by weight of synthetic polyolefin wax having a melting point (DSC) of 100 to 130 ° C, 80 to 95% of crystallinity (X-ray diffractometry), and a number average molecular weight (GPC) of 3000 to 8000; 80 to 90% by weight of an organic solvent selected from xylene, toluene, alcohols, ketones, and mixtures thereof; mixed and melted; the slurry obtained by cooling to 30 ° C. or lower is passed through a wet bead mill apparatus to have an average particle diameter of 2.0 to 6.0. There is provided a matting agent suitable for an ultraviolet curable coating material, characterized in that it is dispersed in fine particles of micrometer.

Moreover, in this invention, (a) 10-20 weight% of synthetic polyolefin waxes with melting point 100-130 degreeC, crystallinity degree 80-95%, and number average molecular weight (GPC) 3000-8000; 80 to 90% by weight of an organic solvent selected from xylene, toluene, alcohols and ketones; mixing and melting to obtain a melt, (b) rapidly cooling the melt obtained in the above step to a temperature below 30 ℃ to obtain a slurry , (c) passing the slurry obtained in the above step through a wet bead mill device having a bead diameter of 0.1 to 5.0mm to disperse the fine particles having an average particle diameter of 2.0 to 6.0㎛, preparing a matting agent suitable for UV curable paint A method is provided.

Hereinafter, the matting agent suitable for the ultraviolet curing paint according to the present invention will be described in detail.

UV-curable paints are mainly composed of unsaturated resins, reactive diluents, and photosynthetic initiators.The UV-curable paints decompose when the photopolymerization initiator is mixed with light of a specific wavelength to generate active radicals. It is.

Matting agent according to the present invention is an additive used in the composition of the UV-curable paint is coated on a coating such as plastic or wood to improve the matting and wear resistance of the surface.

The key component of the matting agent according to the present invention is polyolefin wax. When the polyolefin wax is coated on the coating material, the light irradiated onto the plastic surface by the polyolefin wax particles causes diffuse reflection on the surface so that the reflected light is scattered so that the light is not observed by the naked eye. Is to form a rough coating film that is invisible to induce light scattering to appear matt or matte.

Moreover, the wear resistance improvement of the coating surface can be aimed at by adding and using the polyolefin which has the outstanding wear resistance characteristic to an ultraviolet curable coating material.

In order to realize the properties of matting and abrasion resistance, it is preferable to use a synthetic product for the polyolefin wax. Representative synthetic waxes include polyethylene (PE wax) and polypropylene (PP wax). In addition, amide synthetic wax can be used.

In addition, the polyolefin wax used in the present invention has a linear structure, so that the polyolefin wax having a high crystallinity (X-ray diffractometry) of 80 to 90% is the best, and the number average molecular weight of the polyolefin wax is 1000 to 9000, preferably Should use those from 3000 to 8000. The physical properties of the polyolefin wax and the composition ratio with the solvent are all selected to satisfy the properties of the matte treatment agent, that is, matting, abrasion resistance and workability of the present invention. Hereinafter, even if not described separately, all other numerical limitations and conditions on the production method of the present invention are all selected for the same reason, and when performed within the described range, a matting agent having the desired physical properties of the present invention can be obtained.

In addition, it is preferable to use a synthetic polyolefin wax having a melting temperature of 100 to 130 ° C, preferably 110 to 120 ° C, particularly preferably 120 to 130 ° C.

The solvent used in the present invention may be at least a break point necessary for melting the polyolefin wax, and is preferably 90 to 150 ° C. Xylene, toluene, alcohols and ketones may be used as the solvent, and these solvents may be mixed and used.

The content of the polyolefin wax in the method for preparing a matting agent suitable for the ultraviolet curable paint according to the present invention is preferably 10 to 20% by weight in the total solution (melt of polyolefin weight + solvent weight).

The mill apparatus used in the present invention is a wet mill apparatus, preferably a wet bead mill apparatus, and a bead diameter of 0.1 to 5.0 mm, more preferably 1 to 3 mm for uniformity of particles to be dispersed.

According to the present invention, polyolefin wax dispersed as a fine particle in a solvent may be used as a matting agent and abrasion resistance improving agent of paints, especially UV curable paints.

Hereinafter, the manufacturing method of the matting agent suitable for the ultraviolet curable paint according to the present invention will be described in detail.

After dissolving the synthetic polyolefin wax in 5 to 30% by weight in the corresponding solvent and cooled to a temperature below 30 ℃ that can quickly crystallize the wax to prepare a slurry in which the polyolefin wax dispersed in the solvent in the form of particles and then wet bead mill Through the apparatus, the polyolefin wax particles are dispersed in the range of 2.0 to 6.0 mu m. Care should be taken that the temperature inside the wet bead mill does not exceed the cloud point of the wax. The polyolefin wax particle distribution can be adjusted by subsequent classification.

Hereinafter, the present invention will be described in more detail with reference to the following examples, which are not intended to limit the scope of the present invention.

Example 1

Physical properties and solvents used of the polyolefin wax used in this example are shown in Table 1 below.

Melting point 106 ℃ Number average molecular weight (GPC) 4,500 Density at 24 ℃ 0.920 g / cm 3 solvent Xylene

100 g of polyolefin wax is melted in 900 g of Xylene at 100 ° C., and then the slurry cooled to a temperature below 30 ° C. through which wax can crystallize is passed through a wet bead mill. The bead diameter used for the wet bead mill was 2.0 mm.

Example 2

It was prepared in the same manner as in Example 1 except for the polyolefin wax used.

Melting point 115 ℃ Number average molecular weight (GPC) 4,800 Density at 24 ℃ 0.930 g / cm 3 solvent Xylene

Example 3

It was prepared in the same manner as in Example 1 except for the polyolefin wax used.

Melting point 126 ℃ Number average molecular weight (GPC) 4,000 Density at 24 ℃ 0.970 g / cm 3 solvent Xylene

Test Example 1 Particle size analysis, gloss and wear resistance test

The matte treatment agent obtained in the final steps of Examples 1 to 3 was sampled at 30 minute intervals to measure particle size distribution, gloss, and wear resistance, and are shown in Tables 4 to 6 below.

The particle size analysis in this test example was a laser particle analyzer (model name: masterizer 2000, manufacturer: Malvern Instrument Ltd.), the measuring principle is Laser Diffraction Light Scattering, the measurement range was performed at 0.02 ~ 2000㎛.

Gloss measurement was carried out by BYK Gardner Gloss 60 °, wear resistance measurement was prepared as a disk plate with a diameter of 120mm and a hole 10mm in diameter in the center as a test piece for the measurement of wear resistance. The test piece is fixed horizontally to the rotating plate of the TABER abrasion tester, and two rubber disks wound with abrasive paper (Taber S42 sandpaper strips BM 180-5 / o) are installed to obtain a wear rate per 100 revolutions. It was.

Test result of Example 1            Time (Min) 30min 60min 90min 120 min Particlesize [㎛] d ₁₀ 1.942 1.070 0.845 0.745 d ₅₀ 8.415 3.287 2.504 2.162 d ₉₀ 17.458 7.240 5.025 4.642     Coatong condition Iii) Laromer PO 83F (BASF); amine modified polyether acrylate 90gii) Matting agent 10gⅲ) Dispersed at 2000rpm / 10min; applied with 30㎛ applicatorⅳ) Line speed 5m / min; Mercury lamp 120 W; sigle pass     Gloss 60 ° Seed after dry coating 64 70 75    Abration ratio [%] Seed after dry coating 0.34 0.35 0.35

Test result of Example 2            Time (Min) 30min 60min 90min 120 min Particlesize [㎛] d ₁₀ 1.625 0.978 0.816 0.726 d ₅₀ 8.102 3.115 2.265 2.038 d ₉₀ 15.658 7.164 4.976 4.365     Coatong condition Iii) Laromer PO 83F (BASF); amine modified polyether acrylate 90gii) Matting agent 10gⅲ) Dispersed at 2000rpm / 10min; applied with 30㎛ applicatorⅳ) Line speed 5m / min; Mercury lamp 120 W; sigle pass     Gloss 60 ° Seed after dry coating 56 59 61    Abration ratio [%] Seed after dry coating 0.29 0.31 0.31

Test result of Example 3            Time (Min) 30min 60min 90min 120 min Particlesize [㎛] d ₁₀ 1.542 0.958 0.792 0.716 d ₅₀ 7.984 3.069 2.175 2.011 d ₉₀ 15.215 7.115 4.768 4.288     Coatong condition Iii) Laromer PO 83F (BASF); amine modified polyether acrylate 90gii) Matting agent 10gⅲ) Dispersed at 2000rpm / 10min; applied with 30㎛ applicatorⅳ) Line speed 5m / min; Mercury lamp 120 W; sigle pass     Gloss 60 ° Seed after dry coating 34 39 41    Abration ratio [%] Seed after dry coating 0.18 0.20 0.21

As can be seen from the results of the examples and test examples, the matting agent according to the present invention has a relatively stable value in the range of 2.0 to 6.0 ㎛ in particle size, and excellent properties as the polyolefin wax melting point temperature increases in gloss and wear resistance. In particular, as can be seen from the results of FIG. 1, it was confirmed that the quenching property appeared when added to the UV curable coating composition in a certain range of weight.

The matting agent suitable for the ultraviolet curable paint according to the present invention is excellent in matting and abrasion resistance, and exhibits excellent precipitation stability among ultraviolet curable paints having low viscosity. According to the present invention, it is possible to obtain a matte treatment agent differentiated from existing products at low cost.

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1 is a graph showing the glossiness according to the weight ratio and particle size distribution of the matting agent according to the present invention.

Claims (5)

10 to 20% by weight of synthetic polyolefin wax having a melting point (DSC) of 100 to 130 ° C., 80 to 95% of crystallinity (X-ray diffractometry), and a number average molecular weight (GPC) of 3000 to 8000; 80 to 90% by weight of an organic solvent selected from xylene, toluene, alcohols, ketones, and mixtures thereof; A matting agent suitable for ultraviolet curable paints, characterized in that dispersed in fine particles of μm. (a) 10 to 20% by weight of a synthetic polyolefin wax having a melting point of 100 to 130 ° C, a crystallinity of 80 to 95%, and a number average molecular weight (GPC) of 3000 to 8000; 80 to 90% by weight of an organic solvent selected from xylene, toluene, alcohols and ketones; mixing and melting to obtain a molten liquid, (b) rapidly cooling the melt obtained in the above step to a temperature below 30 ° C. to obtain a slurry, (c) passing the slurry obtained in the above step through a wet bead mill apparatus having a bead diameter of 0.1 to 5.0 mm to disperse the fine particles having an average particle diameter of 2.0 to 6.0 mu m. . The method of claim 1, The polyolefin wax has a melting point of 120 to 130 ℃ a matting agent suitable for UV curable paints. delete The method of claim 2, The polyolefin wax is a manufacturing method, characterized in that the melting point is 120 to 130 ℃.