JPS6313833B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an F.R.P molded product and a method for manufacturing the same.

F・R・P by hand lay-up method or spray-up method in which the surface is covered with a gel coat layer (decorative layer)
Our bathtubs are used in hotels, condominiums, general residences, etc. This F.R.P bathtub is mainly formed of a colored gel coat layer, an intermediate layer, and a backup layer, and is required to have heat resistance, chemical resistance, and strength in order to withstand use. In order to improve the above three aspects, the conventional manufacturing method involves spraying a colored gel coat onto a mold and curing it, and then layering an intermediate layer on top of it, which is made by impregnating glass mat with polyester resin and spraying fine mica foil. After curing, a backup layer (F/R/P layer) was further formed on the upper surface. Since bathtubs are used frequently and the water and hot water cycles are constantly being carried out, the intermediate layer made of glass pine impregnated with polyester resin, etc., completely eliminates the fine air trapped between the fibers of the glass pine etc. during work. It is difficult to remove, and even during bathtub molding, it remains in the intermediate layer as fine bubbles. Therefore, due to the cycle of water and hot water temperature changes, the many fine bubbles remaining in the intermediate layer expand and contract. As time passes, the thin colored gel coat layer is eventually broken and the colored gel coat layer is exposed to the outside air, resulting in cracks in the colored gel coat layer, resulting in an unsightly appearance.

In order to improve the above drawbacks, we removed the glass mat from the middle layer and used only mica foil as a filler.
Instead, the backup layer (F/R/P layer) may be made thicker, or the intermediate layer and the F/R/P layer may be alternately made 2 to 4 times thicker.
A method of forming layers was considered. However, this method has the disadvantage that the amount of work increases as well as the amount of materials used, making it expensive.

The present invention has been made in view of the above-mentioned drawbacks, and aims to provide an F/R/P molded product that has excellent heat resistance, chemical resistance, strength, and good workability, and a method for manufacturing the same. be.

Embodiments of the present invention will be described below with reference to FIGS. 1 and 2.

A gel coat layer 2 made of an unsaturated polyester resin mixed with a pigment is applied to the surface of the mold 1 by hand lay-up method or spray-up method to a thickness of 0.2 mm to 0.5 mm.
The intermediate layer 3 is made of unsaturated polyester mixed with a fine mica foil 5 of 40 to 200 meshes and a glass strand 6 of 0.1 mm to 1.0 mm in length. 0.4mm~
It is applied uniformly to a thickness of 0.7 mm, and after drying to the touch, a back-up layer made of glass fiber or glass mat impregnated with unsaturated polyester is laminated, and after drying and curing, the molded product is removed from the mold.

In addition, styrene is added to the unsaturated polyester resin of the intermediate layer to lower the viscosity of the resin and improve moldability, and an anti-sagging agent is added to the unsaturated polyester resin to reduce the viscosity of the resin and prevent the resin from sagging on vertical surfaces, depending on the resin temperature and room temperature. By changing the mixture and mixing it in, spray work becomes possible, greatly improving work efficiency.

Therefore, since the present invention has the above-mentioned configuration, it achieves the following effects.

(1) By mixing inorganic fine mica foil and glass strands into the intermediate layer, heat resistance and chemical resistance are improved, and the strength is approximately 20% higher than that of an intermediate layer that only contains mica foil in unsaturated polyester resin. This improves the thickness of the backup layer, eliminates the need to increase the thickness of the backup layer, and can be provided at low cost.

(2) By using glass strands for the intermediate layer, the conventional drawback of air bubbles remaining in the intermediate layer during molding and cracking of the surface gel coat layer has been resolved.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an embodiment of the present invention, and FIG. 2 is an enlarged view of section A in FIG. Explanation of symbols, 1... Molding mold, 2... Gel coat layer, 3... Intermediate layer, 4... Backup layer, 5...
...Mica foil, 6...Glass strand.

Claims (1)

[Scope of Claims] 1 A colored layer made of a synthetic resin mixed with a pigment, an intermediate layer made of a synthetic resin mixed with mica foil and a glass strand, and an F/R/P layer are combined into a colored layer, an intermediate layer,
The F/R/P layer is formed by laminating and adhering the F/R/P layers in this order and forming the colored layer as the surface.
P molded product. 2. A colored layer made of a synthetic resin mixed with a pigment is applied to the surface of the mold, and after the colored layer is cured, an intermediate layer made of mixed mica foil and glass strand is applied, and after the intermediate layer is cured, F.R. A method for producing a molded product, characterized by laminating P layers and removing the mold.