KR20030066552A - Polymer Composites for ultraviolet ray interception using iron oxide nanoparticles - Google Patents

Abstract

PURPOSE: Provided is a sunblocking resin using iron oxide nano particles, which can be widely used as various sunblocking packaging materials such as fiber, packaging films, or packaging containers, and storage containers. CONSTITUTION: The resin composition comprises zinc oxide particle having average diameter of 200 nm or less, in order to impart a sunblocking effect to polymeric films or containers. The zinc oxide particle is added by uniformly dispersing the zinc oxide particle in polymer material. Also, the zinc oxide particle is mixed with coating liquid so as to form a mixture, and then the mixture is coated on the surface of polymer films or containers.

Description

Resin composition for UV protection using iron oxide nanoparticles {Polymer Composites for ultraviolet ray interception using iron oxide nanoparticles}

Many products, such as certain fruit juices, soft drinks, beer, wine, foodstuffs, dairy products, cosmetics, shampoos, vitamins and pharmaceuticals, when packaged in plastic containers that allow light to be transmitted, are adversely affected by UV light, causing them to deteriorate, discolor and decompose. . Ultraviolet rays have shorter wavelengths and higher energy than visible light or infrared rays, and change organic materials. Ultraviolet rays can be classified into the wavelength ranges of ultraviolet A (320-400 nm), ultraviolet B (280-320 nm), and ultraviolet C (200-280 nm). The ozone layer is removed by the ozone layer and does not reach the ground surface. The ultraviolet B region is a region capable of causing burns caused by sunlight, and the ultraviolet A region is known to act as a cause of aging and deterioration. Because of their high energy, ultraviolet light can activate many chemicals, altering their structure or paralyzing their function. Therefore, the packaging materials and storage containers are made of resin with the addition of a sunscreen, or the packaging materials and the surface of the storage containers are treated with a sunscreen to block harmful ultraviolet rays of 320-400nm, and thus foods, beverages, alcoholic beverages, fruits, daily sundries, It can prevent various destruction phenomena that can be caused by ultraviolet rays such as the inherent taste, color, and aroma of the UV rays of articles such as clothing, and can extend the shelf life, thereby improving the storage and transportation methods. As a result, the price competitiveness of the product can be increased and storage advantages can be obtained. In addition, it can be used as a packaging material for fish or seafood, which should be packaged with foamed polystyrene (Styrofoam), which is difficult to recycle, and can replace aluminum cans that depend only on imports, thereby contributing to cost reduction.

The sunscreen has been developed various types of sunscreens, which are largely referred to as organic ultraviolet absorbers and inorganic ultraviolet scatterers, and has been performed to reduce the effects of ultraviolet rays by adding these to the resin. Organic ultraviolet absorbers include salicylic acid, benzophenone, cyanoacrylate, etc. having a bonding group capable of absorbing ultraviolet rays in the molecular structure, but in recent years, problems such as lack of heat resistance and weather resistance and stability of decomposition products thereof have been a problem. . In order to solve these problems, particulate titanium dioxide or particulate zinc oxide, which is an inorganic ultraviolet scattering agent having an ultraviolet ray blocking effect, has been developed mainly by scattering ultraviolet rays as a metal oxide having a high refractive index, but this also causes problems such as catalytic action. It is becoming. In the present invention, by dispersing the nanoparticles of zinc oxide in the polymer resin and using them as a fiber blocking material, packaging material, container material to prevent damage to the skin, organic matter by direct irradiation of ultraviolet rays.

Hereinafter, the present invention will be described in more detail. As described above, the ultraviolet ray blocking resin composition of the present invention is obtained by mixing zinc oxide in the form of nanoparticles with a base resin with an inorganic sunscreen to block harmful ultraviolet rays.

Resin used in the present invention is, for example, a group of polyethylene (PE), polypropylene (Polypropylene, PP), polyolefin resin and nylon (Nylon). The polyethylene or polypropylene resin is a transparent or translucent solid, has excellent resistance to acids, alkalis, solvents, and has excellent electrical insulation, water resistance, moisture resistance, and cold resistance, so that various containers, wire coatings, pipes, fibers, linings, food containers, Used for hemp, stretching fibers and various packaging films.

Generally used sunscreens can be classified into organic and inorganic based on broadly divided and organic sunscreens include salicylic acid, benzophenone, cyanoacrylate, etc., but in recent years lack of heat resistance and weather resistance and its decomposition products It is difficult to use because of its stability and the like. In order to block the ultraviolet ray A region (320-400nm) which acts as one cause of the deterioration, an inorganic sunscreen was used in the present invention. In the present invention, zinc oxide is basically used.

Table 1

In the case of titanium dioxide, there are four types of amorphous, anatase, rutile, rutile, and brookite. Exclude amorphous state

The basic structure of the other three types of crystal structure is composed of octahedrons formed of six O atoms and Ti atoms located in the center.The Rutile type shares the octahedron edges, and the Anatase forms the octahedral sides. In the same way, Brookite shares and connects the faces. Anatase transfers to Rutile at 915 ℃ and Brookite transfers to Rutile at 800 ~ 1040 ℃. Rutile is stable in the entire temperature range from room temperature to melting point. Conventionally known techniques for producing UV-blocking resin compositions using titanium dioxide are used without distinguishing between crystalline forms. However, Anatase type titanium dioxide has photocatalytic activity, and the photocatalytic effect has a detrimental effect on the base resin and storage contents. In particular, it is pointed out that the generation of single oxygen by photocatalysis causes problems. In order to solve this problem, the present invention uses nano-sized zinc oxide particles instead of titanium dioxide.

One of the most important matters when preparing a resin composition using the inorganic sunscreen as described above is transparency of films or containers, which are final products obtained from the resin composition. In the case of the secondary packaging shrink film for which the contents do not need to be clearly visible, this opacity is not a big problem, but it can be seen that the primary packaging film and containers used for direct packaging of the product should be transparent from an aesthetic point of view. Especially in the case of films or containers used for packaging fish, juices, vegetables, etc., which are displayed at retail or wholesale stores in bottles or containers, and where consumers first visually determine the freshness and contents of the contents, such a tendency is obvious. Do. From this point of view, the particle size and concentration should be considered very important for the inorganic composite material for UV protection, which is a major factor affecting transparency.

Any suitable process for preparing the resin composition as described in the present invention, such as a master badge manufacturing technique and a compounding manufacturing technique, which is a process for preparing a resin composition known in the art, may be used, and packaging materials and Methods of preparing storage containers also used methods known in the art.

EXAMPLE

Example 1

Zinc oxide particles having an average particle diameter of 200 nm or less were mixed with PES resin 1: 9 to prepare a resin composition having a UV blocking function.

Example 2

Zinc oxide particles having an average particle diameter of 200 nm or less were added and dispersed in a nylon resin so as to have a weight concentration of 100 ppm to prepare a sunscreen resin.

Example 3

Zinc oxide particles having an average particle diameter of 200 nm were added and dispersed in a polyester polymer resin so as to have a weight concentration of 150 ppm to prepare a UV blocking resin.

By packing nano sized sunscreen agent with resin, it develops packaging materials such as fiber, film, container, etc., which has UV protection function, so that it can block UVA (320 ~ 400nm) area that changes and deteriorates organic material due to short wavelength and high energy. It provides a resin composition that can be used as well as a method to reduce the catalytic activity of the inorganic material for UV protection, which is a problem that can occur when using an inorganic UV blocker. The stability of the residences and containers has been improved.

Claims (3)

Resin composition containing zinc oxide particles with an average diameter of 200 nm or less for the purpose of blocking UV rays in films or containers made of a polymer material Method of using the inorganic particles uniformly dispersed in the polymer material in the addition of the inorganic particles in claim 1 Method of using the inorganic particles in the coating of the polymer film or the container by mixing the inorganic particles and the coating liquid for the purpose of UV protection in claim 1