JPH0811211A - Back-up structure of resin molded product - Google Patents

Abstract

PURPOSE:To obtain excellent reinforcement effect by recycling an FRP product, by a method wherein a back-up layer of a compound comprised of recycled powder obtained by pulverizing a waste material of the FRP product and unsaturated polyester resin is provided on the rear of a surface material such as a gel coat. CONSTITUTION:A bathtub 1 is constituted of a gel coat layer 2 of the surface, an FRP layer 3 and a back-up layer 4 comprised of recycled powder to be obtained by pulverizing a waste material of an FRP product and a compound of unsaturated polyester resin. Usually a gel coat material such as unsaturated polyester is used for the gel coat layer 2. Then acrylic vacuum molded sheet may be used as the gel coat layer 2. Then the back-up layer 4 is comprised of a resin compound obtained by mixing up with each other within a range of a ratio of (unsaturated polyester resin):(recycled powder)= 100:50-100 and formed by being sprayed on the FRP layer 3 to an extent of a thickness of 1mm by a spray gun.

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a thermosetting resin F
The present invention relates to a backup structure for a resin molded product in which recycled powder obtained by crushing waste materials of RP products is reused as a backup layer for the resin molded product.

[0002]

2. Description of the Related Art In the case of manufacturing resin moldings such as bathtubs, waterproof pans, counters, boats and other leisure products, it is usual to apply a gel coat layer on the surface of a molding die, and then form a resin and a predetermined length. An FRP layer made of glass fibers cut into pieces is applied and formed by a spray-up method. Then, finally, a nonwoven fabric of glass fibers is laminated, defoamed by a roller, a backup layer is formed by a hand lay-up method, and then the resin is heat-cured to obtain a product.

When a conventional resin molded product is manufactured by FRP, the entire thickness of the product itself is extremely thin, which is in the unit of several millimeters. Therefore, at a portion that needs to be reinforced and / or concealed, A backup layer may be formed on the back side.

On the other hand, a thermoplastic synthetic resin product is generally used to recycle the waste material of the resin product. That is, only waste materials of thermoplastic synthetic resin products that are not FRP are recycled. The reason is that in the case of a thermoplastic resin material, this can be heated and remelted,
This is because it can be easily used as a recycled pellet.

However, since FRP is a thermosetting resin, it cannot be melted once it is heated and cured. Therefore, the waste material of the FRP product is usually recovered by recovering the heat at the time of incineration and then disposed of in a landfill. That is, it is difficult to reuse the waste material of the FRP product as a material.

[0006]

As described above, the waste material of the thermoplastic resin which is not the FRP is reused, and the waste material of the FRP product which is the thermosetting resin material is not reused from the standpoint of the global environment. It was not preferable.

For reference, the fibrous aggregate has the best reinforcing effect. Flake-shaped and bead-shaped aggregates also have some reinforcing effects, but are significantly inferior to fibrous aggregates.

[0008]

SUMMARY OF THE INVENTION The present invention has been made by improving the above-mentioned problems in view of the above-mentioned problems, and it is possible to reuse the recycled powder of the waste material of the FRP product as the backup layer of the resin molded product. It is intended to provide the technology that can be done.

The means adopted by the present invention to solve the above-mentioned problems are as follows: Recycled powder obtained by crushing waste material of FRP product on the back side of the surface material such as gel coat or acrylic vacuum forming sheet, and unsaturated. A backup structure for a resin molded product, comprising a compound backup layer made of a polyester resin.

[0010]

In the present invention, a surface material such as a gel coat or an acrylic vacuum forming sheet is formed on the surface of the molding die which is the product surface. Then, on the back surface side of the surface material, FR
A backup layer of a compound consisting of recycled powder obtained by crushing waste materials of P product and unsaturated polyester resin is provided. Since the particle shape of the recycled powder is fibrous even after crushing, it is possible to obtain an excellent reinforcing effect. Moreover, the waste materials of FRP products can be recycled and used, which is excellent in industry.

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The following is a description of the structure of the present invention based on an embodiment for manufacturing a bathtub with reference to the drawings. FIG. 1 is a bathtub 1 showing a first embodiment of the present invention.
FIG. As shown in the figure, the bathtub 1 of this embodiment includes a gel coat layer 2, a FRP layer 3, and a F
The backup layer 4 is composed of a recycled powder obtained by crushing waste materials of RP products and a compound of unsaturated polyester resin.

The gel coat layer 2 is usually made of a gel coat material such as unsaturated polyester and has a thickness of 0.7 mm.
It is a degree. The gel coat layer 2 is formed by applying it to the surface of the mold by spraying. FRP
The layer 3 has a thickness of about 2 mm, and is formed by spraying the unsaturated polyester resin and the short fiber obtained by cutting the glass fiber onto the gel coat layer 2 while mixing them with a spray gun.

The backup layer 4 is made of a resin compound mixed in a ratio of unsaturated polyester resin: recycled powder = 100: 50 to 100, and is 1 mm.
It is formed by being sprayed with a spray gun to a certain thickness. In this case, the recycled powder used was a waste material of the FRP product, which was crushed to 20 μm to 200 μm.

After that, the resin compound may be cured by heating. As a result, in the backup layer 4,
The recycled powder obtained by crushing the waste material of the FRP product will be present as the aggregate and the reinforcing material, and the particles of the recycled powder have a fiber shape. Excellent, and a good reinforcing effect is obtained as a whole. Moreover, the FRP layer 3
Since the backup layer 4 and the backup layer 4 can be molded by the spray-up method, the efficiency and the workability are excellent as compared with the case of the hand layup.

Next, a second embodiment of the present invention will be described. In the second embodiment, an acrylic vacuum forming sheet is used instead of the gel coat layer 2 of the first embodiment. The only difference is that it is applied to the surface of the molding die or that a pre-molded one is placed on the surface of the molding die. Other configurations and operational effects are the same as those of the first embodiment. Is the same.

FIG. 2 is a partial vertical sectional view of a bathtub 5 according to a third embodiment of the present invention. In the third embodiment, a backup layer 4 made of a compound of recycled powder obtained by crushing waste materials of FRP products and unsaturated polyester resin is formed on the back surface side of the gel coat layer 2 by a spray-up method, and the backup layer is further formed. On the back side of No. 4, a non-woven fabric of glass fiber is laminated and defoamed with a roller to form a mat layer 6 by a hand lay-up method.

In the case of the third embodiment, the backup layer 4 is the main component, and the mat layer 6 reinforces this. In the backup layer 4, as in the case of the first embodiment, the recycled powder obtained by pulverizing the waste material of the FRP product is present as the aggregate and the reinforcing material, and the particles of the recycled powder have the fiber shape. Therefore, the particles are entangled with each other and the bonding strength with the unsaturated polyester resin is excellent, and the particles have excellent strength as a whole.

Next, a fourth embodiment of the present invention will be described. In the fourth embodiment, an acrylic vacuum forming sheet is used instead of the gel coat layer 2 of the second embodiment. The only difference between the two is that only a gel coat is applied to the surface of the mold or a preformed sheet is placed on the surface of the mold to form the surface layer. The effect is the same as in the case of the second embodiment.

FIG. 3 is a partial vertical sectional view of a bath 7 showing a fifth embodiment of the present invention. In this embodiment, only the backup layer 4 made of a compound of a recycled powder obtained by crushing a waste material of an FRP product and an unsaturated polyester resin is formed on the back surface side of the gel coat layer 2. Even with this, since the backup layer 4 itself has excellent strength, it can sufficiently function as a resin molded product.

In the sixth embodiment of the present invention, an acrylic vacuum forming sheet is used in place of the gel coat layer 2 of the fifth embodiment. The other constructions and effects are the same as in the case of the fifth embodiment.

By the way, the present invention is not limited to the above-mentioned embodiments, but can be appropriately modified. For example, the resin molded product can be widely applied to waterproof pans, counters such as kitchen counters and wash counters, leisure items such as boats, and other resin molded products in addition to bathtubs.

[0022]

As described above, according to the present invention,
Focusing on the fact that the recycled powder obtained by crushing the waste material of the FRP product is in the form of short fibers, this is used as a reinforcing material for the resin molded product. Therefore, in the past, it was almost impossible to reuse F unless it was reprocessed by a special method.
Since the RP product can be reused and the strength of the resin molded product can be increased by this recycled powder, it is very useful for the entire industry.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a bathtub according to a first embodiment of the present invention.

FIG. 2 is a partial vertical cross-sectional view of a bathtub according to a third embodiment of the present invention.

FIG. 3 is a partial vertical sectional view of a bathtub according to a fifth embodiment of the present invention.

[Explanation of symbols]

1 ... Bath 2 ... Gel coat layer 3 ... FRP layer 4 ... Backup layer 5 ... Bath 6 ... Mat layer 7 ... Bath

Claims (1)

[Claims] 1. A backup layer of a compound comprising a recycled powder obtained by crushing waste materials of FRP products and an unsaturated polyester resin is provided on the back side of a surface material such as a gel coat or an acrylic vacuum forming sheet. Backup structure for resin molded products.