TW201315597A - Anti-ultraviolet powder structure - Google Patents

Abstract

The present invention provides anti-ultraviolet powder structure including a core layer and an outside layer. The core layer is formed by Poly(methyl methacrylate) mixed with anti-ultraviolet particle, and the anti-ultraviolet particle spread into Poly(methyl methacrylate) uniformly. The outside layer including Poly(methyl methacrylate) and a first ultraviolet absorbent. The outside layer surrounds the core layer. The present invention also provides anti-ultraviolet powder structure including a core layer, a outside layer and a shell layer.

Description

Anti-ultraviolet micropowder structure

The invention provides a fine powder structure, in particular to a fine powder structure having ultraviolet light resistance.

In general, ultraviolet light generally refers to electromagnetic waves having a wavelength between 100 nm and 400 nm, and can be roughly classified into UVC, UVB, and UVA depending on the wavelength. Ultraviolet rays have many adverse effects on people, the environment or materials, so the development of effective UV-resistant materials can greatly reduce the damage caused by UV rays. A material commonly used in ultraviolet rays is an ultraviolet absorber, which is an organic substance, but its use is short in its short life, poor durability, or a problem that toxicity may cause safety, and its use is limited.

Therefore, in order to improve the disadvantages of the ultraviolet absorber, inorganic particles such as titanium dioxide, zinc oxide, cerium oxide or magnesium oxide are generally used. In the use of ultraviolet rays, the inorganic particles are more resistant to ultraviolet rays than ultraviolet rays. Strong absorbent. However, inorganic particles are mostly powders or sol-gels, and are not easily coated on a substrate. Therefore, it is necessary to add a bonding agent. However, general bonding agents have poor weather resistance, and therefore chemical substances made of inorganic particles are used after oxidation. It is easy to cause aging, chalking, cracking, and even falling off of the coating film. Therefore, the use of inorganic particles still has deficiencies in the anti-ultraviolet rays. Therefore, the development of substances that can effectively resist ultraviolet rays will greatly reduce the damage caused by ultraviolet rays.

In view of the above, the present invention provides a micropowder structure which is effective against ultraviolet rays, and the micropowder structure can simultaneously absorb ultraviolet rays, and dissipate and scatter ultraviolet rays. Therefore, by absorbing and dissipating ultraviolet rays, It can completely block ultraviolet rays and achieve good UV resistance.

The present invention provides an anti-ultraviolet micropowder structure comprising a core layer and an outer layer. The core layer is composed of polymethyl methacrylate and anti-ultraviolet particles, and the anti-ultraviolet particles are uniformly dispersed in the polymethyl methacrylate. The outer layer comprises polymethyl methacrylate and a first ultraviolet absorber, and the outer layer is coated outside the core layer.

The invention further provides an anti-ultraviolet micropowder structure comprising a core layer, an outer layer and an outer shell layer. The core layer is composed of polymethyl methacrylate and anti-ultraviolet particles, and the anti-ultraviolet particles are uniformly dispersed in the polymethyl methacrylate. The outer layer comprises polymethyl methacrylate and a first ultraviolet absorber, and the outer layer is coated on the core layer. The outer shell layer comprises polymethyl methacrylate and a second ultraviolet absorbing agent, and the outer shell layer is coated on the outer layer.

The anti-ultraviolet micropowder structure of the invention can prevent ultraviolet light from being irradiated in the whole wavelength band, and the anti-ultraviolet micro-powder structure is added to the general sunscreen product, which can increase the effect of sunscreen and is safe to not irritate the skin. It can be added to inks and coatings and applied to steel coating, building materials coatings and optical films to delay the aging, yellowing and fading caused by long-term sunlight or light. Adding it to the optical plate and the lamp can delay the aging, yellowing and brittleness caused by the illumination of the light source.

For a better understanding of the features and technical aspects of the present invention, reference should be made to the accompanying drawings.

Referring to FIG. 1, the present invention provides an anti-ultraviolet micropowder structure. The anti-ultraviolet micropowder structure is a particle formed by polymerization, and the structure includes a core layer 1 and an outer layer 3. The core layer 1 is obtained by mixing polymethyl methacrylate and ultraviolet-resistant particles, and the ultraviolet-resistant particles are uniformly dispersed in the polymethyl methacrylate. The outer layer 3 includes polymethyl methacrylate and a first ultraviolet absorbing agent, and the outer layer 3 coats the core layer 1 to form a spherical ultraviolet-resistant fine powder structure of the outer layer 3.

The core layer 1 is mainly composed of polymethyl methacrylate and anti-ultraviolet particles, and the anti-ultraviolet particles may be titanium dioxide, zinc oxide, magnesium oxide, calcium carbonate, cerium oxide, barium sulfate and combinations thereof. The purpose of using the ultraviolet-resistant particles is to provide an anti-ultraviolet effect by the ability of the anti-ultraviolet particles to reflect and scatter ultraviolet rays.

The outer layer 3 is mainly composed of polymethyl methacrylate and a first ultraviolet absorbing agent, and the first ultraviolet absorbing agent may be benzophenone, benzotriazole or amine compound. , salicylic acid compound (salicylic acid) and combinations thereof. The first ultraviolet absorbing agent has an effect of absorbing ultraviolet rays through the first ultraviolet absorbing agent to achieve an ultraviolet ray-resistant effect. The outer layer 3 is coated on the periphery of the core layer 1, that is, the ultraviolet-resistant fine powder structure of the present invention is formed, and the particle size distribution of the ultraviolet-resistant fine powder structure is between 1 and 10 μm.

In more detail, when the ultraviolet-resistant fine powder structure is irradiated with ultraviolet rays, the first ultraviolet absorber of the outer layer 3 can absorb ultraviolet rays of a partial wavelength, for example, benzophenone can absorb ultraviolet rays having a wavelength of 290-360 nm. Benzotriazole absorbs ultraviolet light having a wavelength of 270-380 nm, and the intensity of ultraviolet rays can be reduced by absorption by the first ultraviolet absorber. The remaining ultraviolet rays penetrate through the outer layer 3 to reach the core layer 1. The anti-ultraviolet particles of the core layer 1 reflect and scatter the remaining ultraviolet rays. For example, titanium dioxide can reflect and scatter ultraviolet light of a wavelength of 250-340 nm, and zinc oxide can reflect and Scattering ultraviolet light at a wavelength of 240-380 nm. Therefore, the combined outer layer 3 can absorb ultraviolet rays, and the core layer 1 has a function of reflecting and scattering ultraviolet rays, so that the ultraviolet-resistant fine powder structure of the present invention sufficiently achieves an ultraviolet-resistant effect.

Referring to FIG. 2, the present invention further provides an anti-ultraviolet micropowder structure comprising a core layer 1, an outer layer 3 and an outer shell layer 5. The core layer 1 is a mixture of polymethyl methacrylate and ultraviolet-resistant particles, and the ultraviolet-resistant particles are uniformly dispersed in the polymethyl methacrylate. The outer layer 3 includes polymethyl methacrylate and a first ultraviolet absorbing agent, and the outer layer 3 coats the core layer 1. The outer shell layer 5 includes polymethyl methacrylate and a second ultraviolet absorbing agent, and the outer shell layer 5 coats the outer layer 3 to form a spherical ultraviolet-resistant fine powder structure having the outer shell layer 5 appearance.

The core layer 1 is mainly composed of polymethyl methacrylate and anti-ultraviolet particles, and the anti-ultraviolet particles may be titanium dioxide, zinc oxide, magnesium oxide, calcium carbonate, cerium oxide, barium sulfate and combinations thereof. The outer layer 3 is mainly composed of polymethyl methacrylate and a first ultraviolet absorbing agent, and the first ultraviolet absorbing agent may be benzophenone, benzotriazole or amine compound. , salicylic acid compound (salicylic acid) and combinations thereof. The outer shell layer 5 is mainly composed of polymethyl methacrylate and a second ultraviolet absorbing agent, and the second ultraviolet absorbing agent may be benzophenone, benzotriazole or amine compound. , salicylic acid compound (salicylic acid) and combinations thereof. The outer layer 3 is coated on the outer periphery of the core layer 1, and the outer layer 3 is further coated with the outer layer 3 to form the ultraviolet-resistant fine powder structure of the present invention. The particle size distribution of the ultraviolet-resistant fine powder structure is between 1 and Between 10μm.

Further, in this embodiment, the first ultraviolet absorbing agent of the outer layer 3 and the second ultraviolet absorbing agent of the outer shell layer 5 may be two different absorbents, for example, the first ultraviolet absorbing agent. It may be benzophenone, and the second ultraviolet absorber may be benzotriazole. Thus, the outer layer 3 and the outer shell layer 5 of the ultraviolet-resistant fine powder structure can absorb ultraviolet rays of different wavelengths, respectively, and sufficiently achieve the effect of resisting ultraviolet rays.

The following production examples, examples and comparative examples are given to illustrate the effects of the present invention, and are not intended to limit the scope of the present invention.

[Manufacturing Example 1]

1000 parts by weight of deionized water was passed into nitrogen, 1.3 parts by weight of potassium persulfate was added and uniformly mixed at a stirring speed of 200 rpm, the temperature was raised to 70 ° C and maintained at a temperature, and then 330 parts by weight of methyl methacrylate and TiO ₂ 165 were added. Parts by weight and 165 parts by weight of ZnO were obtained, followed by a mixed solution containing an inorganic powder. The mixed solution containing the inorganic powder is added to 40 parts by weight of an aqueous solution of polyvinyl alcohol having a degree of saponification of 86 to 89% and a viscosity of 21 to 26 cps, and then 990 parts by weight with methyl methacrylate and trimethylolpropane trimethacrylate 248. Parts by weight, BPO 2 parts by weight, and 297 parts by weight of UV absorber I (CHISORB 5431, manufactured by DBC) were uniformly mixed, and then stirred at room temperature for 8 hours, and then heated to 60 ° C to obtain UV resistance of Production Example 1. Micro-powder structure.

[Manufacturing Example 2]

The procedure of Production Example 1 was repeated, and only 297 parts by weight of UV absorber I (CHISORB 5431, manufactured by DBC) was changed to 297 parts by weight of UV absorber II (CHISORB BP-12; manufactured by DBC).

[Manufacturing Example 3]

The procedure of Production Example 1 was repeated, except that 297 parts by weight of UV absorber I (CHISORB 5431, manufactured by DBC) was changed to UV absorber I (CHISORB 5431, manufactured by DBC), 148.5 parts by weight, and UV absorber II (CHISORB BP-12; Made by DBC) 148.5 parts by weight.

[Manufacturing Example 4]

Prepared a mixed solution containing an inorganic powder according to Production Example 1, and further added 40 parts by weight of an aqueous polyvinyl alcohol solution having a degree of saponification of 86 to 89% and a viscosity of 21 to 26 cps, and then 450 parts by weight of methyl methacrylate and 1 part by weight of BPO. UV absorber II (CHISORB BP-12; manufactured by DBC) After 148.5 parts by weight of uniform mixing, stirring at room temperature for 8 hours, then heating to 60 ° C, cooling to room temperature, then adding saponification degree 86 to 89% and viscosity 40 parts by weight of a 21 to 26 cps aqueous solution of polyvinyl alcohol to form a solution containing a polymerized fine powder.

450 parts by weight of methyl methacrylate, 192 parts by weight of trimethylolpropane trimethacrylate, 1 part by weight of BPO, and 148.5 parts by weight of UV absorber I (CHISORB 5431; manufactured by DBC) were uniformly mixed into a mixed monomer. The mixture was mixed with the above polymer-containing fine powder solution and stirred at room temperature for 8 hours, and then heated to 60 ° C to obtain the ultraviolet-resistant fine powder structure of Production Example 4.

[Manufacturing Example 5]

The procedure of the production example 4 was repeated except that the order of the addition of the UV absorber was changed, and 148.5 parts by weight of the UV absorber I (CHISORB 5431, manufactured by DBC) was added, and then UV absorber II (CHISORB BP-12; manufactured by DBC) was added. Share.

[Example 1]

10 parts by weight of the ultraviolet-resistant fine powder structure produced in Production Example 1 was uniformly mixed with 90 parts by weight of a thermosetting type adhesive (solid content: 30%), and then applied to a PET film (thickness: 144 μm) at 80 ° C. Bake hardening.

[Example 2-5]

The procedure of Example 1 was repeated except that 10 parts by weight of the ultraviolet-resistant fine powder structure produced in Production Example 2-5 was used instead of the ultraviolet-resistant fine powder structure produced in Production Example 1, and Production Examples 2-5 were respectively Corresponding to Example 2-5.

[Comparative Example 1]

The procedure of Example 1 was repeated, except that the polymethyl methacrylate particles were substituted for the anti-ultraviolet micropowder structure.

[Comparative Example 2]

The procedure of Example 1 was repeated, except that the polymethyl methacrylate particles were coated with UV absorber II (CHISORB BP-12; manufactured by DBC) to replace the ultraviolet-resistant fine powder structure.

[Comparative Example 3]

The procedure of Example 1 was repeated, except that the surface of the polymethyl methacrylate particles was modified and coated with a UV absorber I (CHISORB 5431; manufactured by DBC) to replace the anti-ultraviolet fine powder structure.

[Comparative Example 4]

The procedure of Example 1 was repeated, except that the polymethyl methacrylate particles were coated with titanium dioxide to replace the ultraviolet-resistant fine powder structure.

[Comparative Example 5]

The procedure of Example 1 was repeated, except that the surface of the polymethyl methacrylate particles was modified and coated with titanium dioxide to replace the anti-ultraviolet fine powder structure.

The formulation of the production example 1-5 for preparing the anti-ultraviolet micropowder structure is shown in Table 1, and the examples 1-5 and the comparative examples 1-5 were subjected to a yellowing test, and the test results are shown in Table 2, and the implementation will be carried out. Example 1-5 was measured using a spectrophotometer. The results are shown in Figure 3.

In summary, the present invention has the following advantages:

1. The ultraviolet-resistant fine powder structure of the present invention has excellent processing properties, provides formulation stability, and solves the problem that the ultraviolet absorber is incompatible with inorganic particles.

2. The anti-ultraviolet micro-powder structure of the invention can prevent ultraviolet light from being irradiated in the whole wavelength band, and the anti-ultraviolet micro-powder structure is added to the sun-proof product, which can increase the effect of sun protection, and the safety does not irritate the skin.

3. Apply anti-ultraviolet micro-powder structure to steel plate spraying, building materials coating, optical film, optical plate and lamp to delay the aging, yellowing and fading caused by sunlight or light.

The above is only the preferred embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalents of the present invention and the equivalents of the drawings are all included in the present invention. Within the scope of protection, it is given to Chen Ming.

1. . . Core layer

3. . . External layer

5. . . Outer layer

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the structure of an anti-ultraviolet fine powder of one embodiment of the present invention.

Fig. 2 is a schematic view showing the structure of the anti-ultraviolet fine powder of another embodiment of the present invention.

Fig. 3 is a graph showing the results of spectrophotometer detection of the anti-ultraviolet micropowder structure of the present invention.

1. . . Core layer

3. . . External layer

Claims (9)

An anti-ultraviolet micropowder structure comprising: a core layer formed by mixing polymethyl methacrylate and a plurality of anti-ultraviolet particles, wherein the anti-ultraviolet particles are uniformly dispersed in the polymethyl methacrylate; And an outer layer comprising polymethyl methacrylate and a first ultraviolet absorber, the outer layer coating the core layer. The anti-ultraviolet micropowder structure according to claim 1, wherein the anti-ultraviolet particles are selected from the group consisting of titanium dioxide, zinc oxide, magnesium oxide, calcium carbonate, cerium oxide and barium sulfate. The anti-ultraviolet micropowder structure of claim 1, wherein the first ultraviolet absorber is selected from the group consisting of benzophenone, benzotriazole, an amine compound, and a salicylic acid compound. a group of (salicylic acid). The anti-ultraviolet micropowder structure according to claim 1, wherein the outer layer has a spherical shape and a particle size distribution of between 1 and 10 μm. An anti-ultraviolet micropowder structure comprising: a core layer formed by mixing polymethyl methacrylate and a plurality of anti-ultraviolet particles, wherein the anti-ultraviolet particles are uniformly dispersed in the polymethyl methacrylate; An outer layer comprising polymethyl methacrylate and a first ultraviolet absorbing agent, the outer layer coating the core layer; and an outer shell layer comprising polymethyl methacrylate and a second ultraviolet absorbing agent, The outer shell layer covers the outer layer. The anti-ultraviolet micropowder structure according to claim 5, wherein the anti-ultraviolet particles are selected from the group consisting of titanium dioxide, zinc oxide, magnesium oxide, calcium carbonate, cerium oxide and barium sulfate. The anti-ultraviolet micropowder structure of claim 5, wherein the first ultraviolet absorber is selected from the group consisting of benzophenone, benzotriazole, an amine compound, and a salicylic acid compound. a group of (salicylic acid). The anti-ultraviolet micropowder structure of claim 5, wherein the second ultraviolet absorber is selected from the group consisting of benzophenone, benzotriazole, an amine compound, and a salicylic acid compound. a group of (salicylic acid). The anti-ultraviolet micropowder structure according to claim 5, wherein the outer shell layer has a spherical shape and a particle size distribution of between 1 and 10 μm.