JPS60192731A - Surface-treatment film - Google Patents

Abstract

PURPOSE:A surface-treatment film which, when applied to the surface of a synthetic resin (composite) molding, can readily improve the surface abrasion resistance of the molding, comprising a synthetic resin film to which spherical inorganic powder is added. CONSTITUTION:A spherical inorganic powder 2 (e.g., alpha-alumina of a particle diameter of about 5-50mu) is mixed, with heating, with a synthetic resin 1 to form a uniform dispersion. This dispersion is extruded through a die to form a surface-treatment film (A) having a thickness of about 0.1-0.5mm.. This film (A) is bonded (when the film itself has no adhesiveness, it is bonded through a structural adhesive) to the surface of a molding 3 to form a molding having a surface of excellent abrasion resistance.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field] The present invention relates to a novel film that greatly improves the surface abrasion resistance of molded products by coating and adhering them to molded products made of various materials.

[Background technology]

Various attempts have been made to impart wear resistance to the surfaces of molded products made of synthetic resins or composite materials made of reinforcing materials and synthetic resins (for example, Japanese Patent Application Laid-Open No. 54-493Q). The reality is that no one has been obtained that has this.

The present inventors have previously proposed a paint that has a high degree of abrasion resistance by mixing a small amount of spherical inorganic powder into a synthetic resin. This made it possible to modify the surface of molded products.

[Purpose of the invention]

The present invention aims to not only facilitate coating of molded articles but also achieve uniform coating by forming the coating material into a film.

[Structure of the invention]

The gist of the present invention is a surface-treated film for imparting wear resistance, which is made by blending spherical inorganic powder with a synthetic resin.

To explain in more detail, the above-mentioned film is composed of a synthetic resin that forms the film and special inorganic powder, and moreover, it is made by mixing a substance with a small amount of these inorganic powders (some of which are spherical). By coating and adhering such a resin film to the surface of a molded product made of synthetic resin, metal, wood, or inorganic material, it is possible to significantly improve the surface abrasion resistance of the molded product.

The spherical inorganic powder of the present invention is alpha alumina, diamond/metallic powder.

The present invention will be explained in detail according to the drawings.

Figure 1 shows a cross-sectional view of a film (Al) according to the present invention in which spherical inorganic powder 2 is mixed into a synthetic resin layer l. 3
The surface of the molded product is modified by coating and adhering it to the surface of the molded product and protecting the surface of the molded product layer tBl with a wear-resistant film layer.

There is no problem whether the resin constituting the film of the present invention is thermoplastic or thermosetting. The resin of the film may be selected depending on the material of the molded article.

If the film itself does not have adhesive properties, the purpose can be achieved by filling the gap between the film and the molded object with a structural adhesive.

Next, regarding the manufacturing method of the above-mentioned abrasion-resistant film,
When using thermoplastic tree manure, the easiest way to produce it is to heat the resin while taking into account the thermal properties of the resin, knead the spherical inorganic powder at an appropriate viscosity, and then extrude it through a die.

Although the thickness of the film depends on the shape and size of the molded product, a thickness of 0.1 to 0.5*w is most suitable for handling. Of course, in this case, there is also a relationship with the particle size of the spherical inorganic powder, and from the viewpoint of wear resistance, the powder particle size is preferably 5 to 50 μm, more preferably 5 to 30 μm. In addition, when using a thermosetting resin, select a resin that has an appropriate viscosity at room temperature, mix the powder, add a hardening agent, and then extrude it from the same die.
Spread on release paper and cool and store.

The coating adhesion of the above-mentioned film on the molded article is determined depending on the material of the molded article and the type of film resin.

Example After adding a curing agent and a curing accelerator to a bisphenol A-based epoxy resin, 300 parts (N amount in each case) of spherical α-alumina powder with an average particle size of 20 μm was mixed with 100 parts of the resin to disperse it well. After that, the mixture was extruded from a T-die and spread on release paper to form a film having a thickness of 0.25 mrtt. This film was attached to the surface of a board made by hardening with epoxy resin, and the film was cured by heat treatment at 130°C for 120 minutes. As a result, a film with a thickness of 0.21 mm and sufficient adhesion to the board was obtained. Ta.

The above treated plate and the untreated epoxy resin plate were placed in a taper set abrasion tester, and the surface was abraded using Teledyne Taper company standard O8-17, load 10001, number of rotations 2000 times, and rotation speed 100 times/min. As a result of the test, the film-coated plate showed a wear loss of only 37 cm, while the untreated board showed a wear loss of 128 cm.

〔effect〕

By coating molded products such as rollers and pipes with the film of the present invention, it is possible to greatly improve the surface abrasion resistance of the molded products, and the field of application thereof is expanded.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a synthetic resin film prepared by kneading spherical inorganic powder, and FIG. 2 is a cross-sectional view of both objects obtained by coating and adhering the film shown in FIG. 1 onto the surface of a molded article. 1 Synthetic resin 2 Spherical inorganic powder 3 Molded product

Claims (1)

[Scope of Claims] 1. A film for surface treatment imparting wear resistance, comprising a synthetic resin mixed with spherical inorganic powder. 2. The film according to claim 1, wherein the spherical inorganic powder has an average particle size of 5 to 50 μm. 3. The film according to claim 1 or 2, wherein the spherical inorganic powder is α alumina. 4. A molded article whose surface is coated and bonded with the film according to claim 1, 2, or 3 to impart wear resistance.