JPH0467804A - Umbrella with ultraviolet-ray absorbing film - Google Patents

Abstract

PURPOSE:To prevent the human body from being irradiated with ultraviolet rays by forming an ultraviolet-ray absorbing film consisting of zinc oxide at least on either of the surface and the reverse side of a sheet part. CONSTITUTION:A sheet part 5 is roughly circular one attached to master ribs 4 ... centering around a shoe 5 formed in the end part of the opposite side to a grip handle 3 of an umbrella shaft 2, and it is that which consists of a sheet of a cloth or a synthetic resin, etc. In such a sheet part 5, an ultraviolet- ray absorbing film 9 is formed on the reverse side. This ultraviolet-ray absorbing film 9 is formed from a paint manufactured by using zinc oxide whose particle diameter is <= 0.1 mum as a main component, and adding a binder and a solvent thereto. In the case of such an umbrella 1 as the ultraviolet-ray absorbing film 9 is formed, the utlraviolet-ray absorbing film 9 absorbs satisfactorily ultraviolet rays without spoiling entirely a pattern and a design of the umbrella 1, there fore, by putting up this umbrella, it can be prevented easily that the human body is irradiated with ultraviolet rays.

Description

DETAILED DESCRIPTION OF THE INVENTION "Field of Industrial Application" The present invention relates to umbrellas such as rain umbrellas, parasols, and beach umbrellas, and more particularly to an umbrella in which a UV absorbing film is formed on the sheet portion.

``Conventional technology'' Umbrellas commonly used in the past include rain umbrellas to protect the human body from getting wet in the rain, parasols to protect from strong sunlight during sunny days, and umbrellas to create shade at beaches and pools. There are beach umbrellas, and even large umbrellas used at golf courses.

By the way, in recent years, due to the destruction of the ozone layer by fluorocarbon gases, there has been a tendency for large amounts of ultraviolet rays to be irradiated onto the earth's surface, and there is a growing fear that the incidence of skin cancer will increase.

However, the reality is that in the past, few measures have been taken to block ultraviolet rays outdoors. In other words, even with parasols, beach umbrellas, and other umbrellas designed to protect against strong sunlight, they usually do not have any measures taken to block ultraviolet rays, and of course, no such measures are taken with umbrellas. Not yet.

This invention was made in view of the above circumstances, and its purpose is to more effectively block out the ultraviolet rays that are irradiated not only during sunshine but also on rainy days, given the current situation where ultraviolet rays are becoming more and more intense. Our goal is to provide umbrellas that can

"Means for Solving the Problems" In the umbrella with an ultraviolet absorbing film according to claim 1 of the present invention, it is preferable that an ultraviolet absorbing film is formed on at least one of the front and back surfaces of the sheet part, and the ultraviolet absorbing film according to claim 2. In the umbrella with an absorption film, the above-mentioned ultraviolet absorption film is made of zinc oxide having a particle size of 0.1 μm or less as a means for solving the above problem.

"Function" According to the umbrella according to claim 1, by forming the ultraviolet absorbing film, the human body is prevented from being irradiated with ultraviolet rays through the notebook portion.

Further, according to the umbrella according to claim 2, since the film made of zinc oxide with a particle size of 01 μm or less has excellent ultraviolet absorption ability,
By holding an umbrella with this formed on the seat part, the human body is prevented from being exposed to ultraviolet rays.

"Example" The present invention will be explained in detail below.

FIGS. 1 and 2 are diagrams showing an embodiment of the present invention, and in these figures, reference numeral 1 represents an umbrella. This umbrella 1 has the same structure as a conventionally commonly used Western umbrella (umbrella), and has a handle 3 formed on one side of an umbrella shaft 2, a large number of ribs 4 attached to the other side, and A /-t part 5 is attached to these main ribs 4.

The main ribs 4 are each rotatably attached to one end or the umbrella shaft 2, and a support bone 6 is connected to the intermediate portion thereof. One end of the support rib 6 is rotatably attached to the main rib 4, and the other end is rotatably attached to a potter's wheel 7 which is slidably inserted onto the umbrella shaft 2.

The seat part 5 is approximately circular and is attached to the main rib 4 with a stone 8 formed at the opposite end of the handle 3 of the umbrella shaft 2 as the center, and is made of a sheet of cloth or synthetic resin. It is something. Then, with this configuration, umbrella 1
By sliding the potter's wheel 7 on the umbrella shaft 2, the main ribs 4 and 6 can be erected and the seat part 5 can be opened (and the main ribs 4 and 6 can be opened). ... can be folded to close the seat portion 5.

Here, an ultraviolet absorbing film 9 is formed on the back surface of the sheet portion 5, as shown in FIG. This ultraviolet absorbing film 9 mainly contains zinc oxide with a particle size of 0.1 μm or less,
It is made from a paint made by adding a binder and a solvent to this.

In this paint, the average particle size of zinc oxide, which is the main component, is set to 0.1 μm or less because it is thicker than this (this results in a small surface area per unit weight and the UV shielding effect is insufficient, and the visible light This is because when the wavelength approaches , it also absorbs and scatters visible light, resulting in a significant decrease in transparency.

Various methods can be adopted to produce such fine particles of zinc oxide, but for example, it can be produced based on the method for producing ultrafine zinc oxide previously proposed by the applicant (Japanese Patent Application No. 1-130422). be able to. In other words, in this method,
Hydrogen sulfide was passed through a mixed solution of zinc acid salt and ammonium acetate to remove soluble salts from the resulting precipitate, then the precipitate was dispersed in a non-aqueous solvent, and the mixture was heated in an autoclave at 250 to 400'C. The gas is removed by heating, and the resulting dry powder is then heat-treated at 500 to 800°C to obtain ultrafine zinc oxide particles.

In the present invention, it is more preferable that the particle size of the zinc oxide be 0.1 μπ or less, or that 90% of the particles be 0005 to 0.05 μ debris.

In addition, as a binder, when used as a paint, it is not easily deteriorated by ultraviolet rays, has excellent weather resistance, and can form a film with high transparency, and at the same time has excellent adhesion to the object being coated. It must be of the same type.

As the type of binder having such properties, both ordinary organic binders and inorganic binders can be used. For example, polyester resins, vinyl resins, γ-acrylic resins, fluorine resins, silicone resins, alkali silicates such as sodium silicate, inorganic colloids such as silica sol and alumina sol, and metal alkoxides such as tetraethoxysilane. , phosphates such as aluminum phosphate, metal salts such as tin acetate, metal soaps, and organometallic compounds are suitable. Of course, two or more of the above-mentioned materials may be mixed or reacted together.

As the solvent, one or a mixture of two or more selected from aromatic hydrocarbons, alcohols, esters, ketones, ethers, saturated hydrocarbons, chlorinated carbons, fluorinated carbons, and water. or preferably used.

In such a paint made of zinc oxide, a binder, and a solvent, the amount of zinc oxide ultrafine particles is 5 to 9% of the solid content of the paint.
The content is 0% by weight, preferably 40 to 80% by weight. Here, the amount of zinc oxide ultrafine particles is 5% of the paint solids.
The reason why the amount of zinc oxide is less than 5% by weight is that the percentage of light that does not pass through zinc oxide increases and the blocking rate of ultraviolet rays decreases, whereas when the amount of zinc oxide exceeds 90% by weight This is because the amount of binder (binder) becomes relatively small, and the binder cannot fill the spaces between the zinc oxide particles, resulting in a brittle coating film.

In addition, the binder compounding agent is 5 to 90% by weight of the solid content of the paint.
It is said that In order to uniformly disperse the fine particles of zinc oxide in the binder, for example, a whole mill, an attritor, a sand grinder, a three-roll mill, a high-speed impeller mill, a jet mill, a paint mill, a homogenizer, an ultrasonic dispersion machine, etc. It is desirable to use sudo alone or in combination.

To apply such a paint to the sheet portion 5 of the umbrella 1, it can be easily done by spray coating, dip coating, brush coating, or other known coating methods, and furthermore, it can be applied by gravure printing, offset printing, etc. can also be done. In this case, the thickness of the absorbent film 9 formed by applying the paint is set to be approximately 20 μm or less when spray coating, dip coating, brush coating, etc. are used, from the viewpoint of workability; In the case of offset printing or the like, the amount is about 1 to 5 μl. The absorbing film 9 formed in this way needs to be sufficiently transparent so that the patterns and designs of the sorting section 5 can be clearly seen, so the haze value of the film 9 is preferably 10 haze or less. , shi< are set to be 1 haze or less.

In the umbrella 1 formed with such an ultraviolet absorbing film 9,
Since the ultraviolet absorbing film 9 is formed on the sorting part 5 without damaging the pattern or the tethers of the umbrella 1, the umbrella has no difference in appearance compared to a conventional umbrella. Moreover, since this absorption film 9 absorbs ultraviolet rays well, by applying it, it is possible to easily prevent the human body from being irradiated with ultraviolet rays.

In the above embodiment, the ultraviolet absorbing film 9 was formed from a paint mainly composed of zinc oxide with a particle size of 01 μm or less, but the formation of the film 9 is not limited to this, and for example, hensifenone, It may be formed using a paint containing a benzotriazole-based or salicylic acid-based ultraviolet absorber as a main component.Also, in the above embodiment, the ultraviolet absorbing film 9 was formed only on the back surface of the sheet portion 5. It may be formed only on the surface of the sheet portion 5, or may be formed on both the front and back surfaces of the sheet portion 5.

Furthermore, although the above embodiment shows an example in which an ultraviolet absorbing film is formed on an ordinary umbrella, the present invention is not limited thereto. For example, as shown in FIG. It may also be one with an ultraviolet absorbing film formed.
Furthermore, an ultraviolet absorbing film may be formed on the seat portion of the parasol.

(Experiment example) 12 parts by weight of ultrafine zinc oxide particles with a particle size of 0.1 μm or less, 8 parts by weight of Noricone-acrylic resin as a binder, 40 parts by weight of toluene and 40 parts by weight of ethyl acetate as solvents were mixed. A paint was prepared by dispersing with sand grino goo for 2 hours.

Spray coat the paint obtained in this way,
It was applied to sheets for rain umbrellas, parasols, and beach umbrellas to form ultraviolet absorbing films.

When we investigated the ultraviolet absorption rate of sheets for umbrellas, parasols, and beach umbrellas on which ultraviolet-absorbing films were formed, we found that all of them were able to block more than 90% of ultraviolet rays with a wavelength of 400 μl or less. No discoloration of the sheet was observed at all.

In addition, when these sheets were subjected to outdoor exposure tests, no abnormalities were found in either the sheets or the absorbent film, and the heat resistance and
It was confirmed that it has excellent weather resistance and light resistance.

"Effects of the Invention" As explained above, the umbrella with ultraviolet absorbing film of this invention has
The ultraviolet absorbing film does not spoil the pattern or design of the umbrella at all (since it is formed on the sheet, there is no difference in appearance compared to conventional umbrellas). Because it absorbs UV rays well, using this umbrella can easily prevent the human body from being irradiated with ultraviolet rays, thereby easily preventing the development of skin cancer.

[Brief explanation of drawings]

1 and 2 are diagrams showing an embodiment of an umbrella with an ultraviolet absorbing film of the present invention, and FIG. 1 is a schematic configuration diagram of the umbrella;
FIG. 2 is an enlarged sectional view of the seat portion, and FIG. 3 is a diagram showing another embodiment of the umbrella of the present invention, and is a schematic configuration diagram of the beach umbrella. 1...umbrella, 5. 11... Seat part, 9
...Ultraviolet absorption film, 10...Beach umbrella.

Claims (2)

[Claims] (1) An umbrella with an ultraviolet absorbing film, characterized in that an ultraviolet absorbing film is formed on at least one of the front and back surfaces of the seat portion. (2) An umbrella with an ultraviolet absorbing film according to claim 1, wherein the ultraviolet absorbing film is made of zinc oxide having a particle size of 0.1 μm or less.