JPS61266246A - Method of forming ultraviolet curing cushioning material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention provides a method for preventing damage to the product by the parts when attaching any part made of metal, plastic, glass, etc. to any base such as an automobile or home appliance. The present invention also relates to a method of forming an ultraviolet curable buffer material that can prevent gaps between parts and products.

[Conventional technology]

2. Description of the Related Art Automobiles, home appliances, and the like are equipped with various parts to provide design and functionality. For example, there are parts that are installed on cars from a design standpoint, such as Ll-1, side moldings, emblems, carnishes, etc., and parts that are installed from a functional standpoint include front and rear glass, headlamps, brake lamps, turn signals, etc. These parts are attached to the car body using screws, rivets, fasteners, etc. However, if these parts are directly fastened with screws, etc., the car's body paint may be damaged and rust may occur, and gaps may be created between the parts and the body, significantly reducing the product value. As a result, parts are currently mounted with cushioning material sandwiched between the parts and the body. As a cushioning material, polyurethane,
Sheet-like or molded products made of plastics such as vinyl chloride rubber or leather are used, and some are attached by applying adhesive or adhesive.

[Problem that the invention seeks to solve]

As mentioned above, cushioning materials play an important role when parts are mounted on automobiles, etc. However, the cushioning materials conventionally used have various problems and improvements are desired. For example, the problems are: (a) The cost is high because the sheet material must be punched and formed to match the size and shape of the parts to be attached, and cushioning material must be created for each part.0 (b) Cushioning When attaching materials, it is often necessary to do it manually, which makes the work cumbersome (C
) When automating the installation of cushioning materials, there is no equipment that can be applied to various parts. (d.) When adhesives are used to attach cushioning materials, heat treatment is often required for curing.
In view of these problems, the present inventors have developed a buffer that can be applied to a variety of Hiko parts, regardless of the shape or size of the part, and can be bonded in a short time. The present invention was completed as a result of repeated studies aimed at finding a method for forming the material.

[Means to solve the problem]

That is, the present invention, when attaching any part to any base, applies an ultraviolet curable resin composition to at least one of the contact areas between the base and the part, and then irradiates ultraviolet rays to form a cured film. [Function] Any substrate that can be used in the present invention can be manufactured by attaching parts to it. Examples include cars (including trucks, passes, etc.), motorcycles, home appliances, building materials, building doors, windows, etc., but are not particularly limited.
It can be suitably used for products whose commercial value is significantly impaired if the base is damaged when or after parts are attached or if a gap is created between the parts and the base. Parts are not particularly limited as long as they can be attached to the above-mentioned base, but for example, parts when the base is a car body include side moldings, emblems, garnishes, front and rear glass. , brake lights, etc., and when the base is a home appliance, the parts include:
Examples include internal parts such as nameplates, display boards, switches, capacitors, and variable capacitors.

The ultraviolet curable resin composition that can be used in the present invention is a conventionally known one. For example, prepolymers such as polyester acrylate, epoxy acrylate, polyurethane acrylate, polyether acrylate, polyol acrylate, polybutadiene acrylate, and 2-hydroxyethyl (meth)acrylate, 2-hydroxypropyl (meth)acrylate, tetrahydroxyfurfuryl ( meth)acrylate, glycidyl (meth)acrylate, neopentyl glycol di(meth)acrylate, ethylene glycol diacrylate, diethylene glycol diacrylate, triethylene glycol diacrylate, tetraethylene glycol diacrylate, 1,3-butylene diacrylate, 1 .4-fringiol di(meth)acrylate, l,6-hexanethiol di(meth)acrylate, trimethylolpropane tri(meth)acrylate, pentaerythritol tri(meth)acrylate, pentaerythritol tetra(
Monomers such as meth)acrylate, dipentaerythritol tri(meth)acrylate, dipentaerythritol tetra(meth)acrylate, dipentaerythritol penta(meth)acrylate, and dipentaerythritol hexa(meth)acrylate can be used. Such prepolymers and monomers may be used alone or in combination as a UV-curable composition. When used in combination, the mixing ratio of the prepolymer in the ultraviolet curable resin composition is preferably 10 to 100% by weight, particularly preferably 30 to 95% by weight. In order to cure these ultraviolet curable resin compositions with ultraviolet light,
It is preferable to contain a known photopolymerization initiator, and examples of such photopolymerization initiators include benzoin alkyl kx-furs, acetophenones, benzophenones, benzyl, anthraquinones, polynuclear quinones, and disulfides. Can be mentioned.

The proportion of the shredded photopolymerization initiator to be used is not particularly limited, but it is preferably from 1 to 20% by weight based on the resin composition of the prepolymer and/or monomer.

Furthermore, various resins, solvents, and additives can be added to the ultraviolet curable resin composition described in Section 2.

Resins that can be added include acrylic resins, chlorinated polyolefin resins, polyvinyl acetate, cellulose derivatives, epoxy resins, alkyd resins, polyester resins,
These resins are polyurethane resins, and by adding these resins, it is possible to adjust the viscosity and modify the hardness and flexibility of the coating film.

-1, synthetic rubbers that are generally difficult to be compatible with ultraviolet curable resin compositions, such as butadiene-styrene rubber, butyl rubber, nitrile rubber, chloroprene rubber, urethane rubber, etc., can be contained in a finely dispersed state. Addition of these synthetic rubbers is preferable because a cushioning effect can be obtained and the scratch prevention function can be enhanced.

Examples of solvents include alcohols such as ethanol, i-propertool n-propertool, 1-butanol, and n-butanol, aromatic hydrocarbons such as benzene, toluene, xylene, and ethylbenzene, and acids such as ethyl acetate and butyl acetate. Esters such as ketones such as acetone, methyl ethyl ketone, and methyl isobutyl ketone, and ethers such as dioxane can be used, and these solvents may be used singly for the purpose of adjusting viscosity, etc.
You may use a mixture of more than one species.

In addition, as additives, conventionally known photoreaction sensitizers,
Thixotropic agents, plasticizers, antifoaming agents, surfactants, stabilizers, ultraviolet absorbers, rust preventives, pigment dyes, and the like can be used in conventional amounts.

The method for applying the ultraviolet curable resin composition in the present invention is as follows:
Methods such as coating with a dispenser, brush coating, flow coating, spray coating, dip coating, and coating with various coaters can be used, and in the case of automating the work process, coating with a dispenser is preferred. The thickness of the coating film obtained by these coating methods is not particularly limited, but is preferably in the range of 5 μm to 5 mm.
A range of 20 μm to 3 mm is particularly preferred. This film thickness is
If the thickness is less than 5 μm, the function as a buffer material cannot be obtained, and if it exceeds 5 mm, the coating film will not be sufficiently cured, which is not preferable.

The ultraviolet curable resin composition of the present invention includes a xenon lamp,
It can be easily cured in a short time by ultraviolet rays irradiated from a low-pressure, medium-pressure, or high-pressure mercury lamp, metal halide lamp, or the like.

The hardness of the cured coating film is determined by forming a cured coating film with a thickness of 2 mm on an ABS resin plate and measuring it with a spring-type hardness tester specified in JIS K 6301 hot-flow rubber physical testing method. It is preferable that the hardness is 5 degrees or more and 90 degrees or less in a C-type tester, but when a soft material is used as the base, it is necessary that the hardness is less than the soft material to prevent scratches.

〔Example〕

Hereinafter, the present invention will be explained in more detail with reference to Examples.

The composition of each component in the examples is expressed in parts by weight.

Example 1 Each component in the following blending ratio was mixed and stirred until uniform, to obtain an ultraviolet curable resin composition (a) (hereinafter referred to as composition (a)).

Urethane acrylate (Unidic V-4601 manufactured by Inu Nippon Inn 30 parts, Seikagaku Kogyo Co., Ltd.) Photopolymerization initiator (Irgacure #651 manufactured by Nippon Ciba Geigy Co., Ltd. 1 part Ultraviolet absorber (Tinuvin $328 manufactured by Nippon Ciba Geigy Co., Ltd. 0.1 parts) Leveling agent (manufactured by Shin-Etsu Chemical Co., Ltd. 0.5 part KF-
301) Toluene 30 parts Ethyl acetate 3' 7.5 parts The obtained composition (a) was spray-painted on a metal molding so that the dry film thickness was 20 μm, and 1000 m J/(: of the energy amount of J) was applied. It was cured by irradiating it with ultraviolet rays.In addition, during this spray painting, we changed the shape of the molding in various ways, but we were able to freely handle the molding with one with a relatively complex shape.-
! The film thickness can be easily controlled by appropriately setting the application amount and spray time of the spray gun, which makes manufacturing and installation of the conventional cushioning material much less difficult. It was confirmed that the cushioning material could be easily attached.

In addition, when a high-pressure mercury lamp is used for ultraviolet irradiation, the coating film hardens in about 10 seconds, making it possible to attach the cushioning material in an extremely short time. ) was screwed onto a painted iron plate so that the cured film of ) was the contact surface, and the painted surface was examined for scratches, but no scratches were found on the painted surface. Furthermore, we conducted a 1,000-hour exposure test on the painted board with the molding fixed with screws using an accelerated weather resistance tester (Sunshine Weather-Ometer manufactured by Suga Test Instruments Co., Ltd.). No rust was observed, the product maintained a good appearance, and its performance was comparable to that of conventional cushioning materials.

Example 2 Each component in the following blending ratio was mixed and stirred until uniform, to obtain an ultraviolet curable resin composition (b) (hereinafter referred to as composition (1)).

Epoxy acrylate (Inu Nippon Ink, 70 parts Unidic V-4220 manufactured by Kagaku Kogyo Co., Ltd.) THF-A (tetrahydrofurfury 17 parts Ruacrylate) Photopolymerization initiator (6 parts Irgacure 1651 manufactured by Nippon Ciba Geigy Co., Ltd.) Thixotropic agent (Mizusawa Chemical Company-made Mizu 7 part Kasil R
-9+72) The obtained composition (b) was applied to a vacuum degassing metal molding with a microdispenser so that the dry film thickness was 2 to 3 pus, and irradiated with ultraviolet rays with an energy amount of 1000 ml and 100 O. Hardened. As in Example 1, this work was extremely easy to perform compared to the conventional cushioning material installation work.

Next, the obtained molding was screwed to the same painted plate as used in Example 1, and the condition of the painted surface was checked and an exposure test was conducted for 1000 hours using an accelerated weathering tester, but all results were good. The results showed that the performance was comparable to that of conventional cushioning materials.

〔effect〕

The method of using the ultraviolet curable resin composition of the present invention as a cushioning material is efficient and can be applied to various cushioning materials depending on the shape of the part. Since the coating film can be cured with ultraviolet rays in a short period of time (several seconds to several minutes), it can be used as a suitable means for shortening the work process. Furthermore, the present invention has the advantage that even if the contact surface between the base body and the component is relatively complex, it is difficult to form a gap between the base body and the component.

As described above, according to the present invention, it is possible to provide a method of forming a cushioning material having excellent properties very efficiently and having extremely high utility value.

Claims (1)

[Claims] When attaching any part to any base, an ultraviolet curable resin composition is applied to at least one of the contact areas between the base and the part, and then UV rays are irradiated to form a cured film. Method of forming hardenable cushioning material.