JPS5918222B2 - Adhesion method between vinyl chloride resin and metal base material - Google Patents

Description

[Detailed description of the invention] The present invention relates to vinyl chloride resin (hereinafter referred to as PVC).

) and a metal base material. When PVC is bonded by film lamination, paste coating, powder coating, fluid dipping, or other methods to provide corrosion resistance or decorative properties to metal substrates, PVC does not inherently have adhesive properties to metal. , it is common to use a primer.

However, coating the primer has problems such as deterioration of the working environment due to evaporation of the solvent, pollution, and other problems, and coating may be difficult depending on the shape of the adherend. As a result of research into a method for adhering PVC to metal substrates without using a primer, the present inventors obtained a method by mixing a specific polyvalent metal 5-salt monomer of methacrylic acid with PVC. P
The present invention was completed by discovering that PVC and metal can be firmly bonded by melting a VC composition and bringing it into close contact with a metal base material.

The present invention uses 0.1 to 10.0 parts by weight of a polyvalent metal salt of methacrylate selected from the group consisting of aluminum methacrylate, zinc methacrylate, and calcium methacrylate to parts by weight of PVCIOO. This method is characterized in that the PVC resin composition obtained by mixing in the same proportions is melted and brought into close contact with a metal base material.

There are no particular restrictions on the PVC used in the present invention, and it may be a vinyl chloride homopolymer or contain at least 70% by weight of vinyl chloride.
A copolymer containing an ethylenically unsaturated monomer which can be copolymerized with vinyl chloride such as vinyl acetate, acrylic acid ester, vinylidene chloride, etc. can be used.

As for its shape, it may be in any shape, such as suspension polymerization powder, emulsion polymerization powder, or pellet shape. Mixing of PVC and polyvalent metal methacrylate is 2
5. It can be easily carried out according to a conventionally known method. For example, powdered PVC and solid polyvalent metal methacrylate are mixed together with a PVC plasticizer and other additives if necessary using a general-purpose machine such as a mixing roll, extruder, Burberry mixer, Penshell mixer, 30 kneader, etc. This can be done by thoroughly mixing using a machine. At this time, the amount of polyvalent metal methacrylate used should be in the range of 0.1 to 10.0 parts by weight per 100 parts by weight of PVC, and less than 0.1 parts by weight should be used. The purpose of the present invention cannot be achieved if the amount used is more than 10.0 parts by weight, and on the other hand, a proportionate effect cannot be expected if the amount used is more than 10.0 parts by weight, but rather causes undesirable problems such as discoloration of PVC. Further, the mixing temperature can be in the range of 100°C to 180°C, and it is desirable to select it within this temperature range according to the form of the desired resin composition. That is, in order to obtain a PVC composition in the form of a sheet or soft lump, it is desirable to set the temperature to a relatively high temperature of about 140 to 160°C. Adhesion in the present invention can be performed according to various methods. For example, this can be carried out by heating and melting the PVC resin composition, charging it into a mold together with the metal base material, holding the composition for a certain period of time to bring the two into close contact with each other, and then cooling. In addition, about 50 to 100 mesh powder PV
A fluidized bed is formed using the C resin composition, and P is applied to the layer in advance.
This can be done by heating a metal base material to a temperature equal to or higher than the melting temperature of VC, immersing it for a certain period of time to adhere a certain amount of PVC, and then taking out the metal base material from the layer and cooling it. Furthermore, this can also be done by not melting the entire PVC composition, but by melting the area in contact with the metal base material and bringing it into close contact with the base material, and when using a relatively thick bulk PVC composition. It is valid. In this case, the metal base material is a wire made of metal or alloy such as iron, brass, zinc, aluminum, nickel, chromium, copper, etc.
Examples include wire, plates, nets, steel, cloth, and various mechanical parts. The PVC resin composition may also contain additives customary in the art, such as pigments, plasticizers, stabilizers, ultraviolet light,
Absorbers, fillers, antistatic agents, etc. can be added as necessary. Although it is not clear why PVC containing a polyvalent metal methacrylic acid salt has excellent adhesion to metal substrates, it is thought that the salt reacts with PVC and bonds with it in some way.

The bonded PVC is expected to have been modified with a polyvalent metal methacrylic acid salt.

If the bonded PVC is in the form of a relatively thin film 3, it will adhere to and cover the metal base material, but it goes without saying that such cases are also included in the adhesion in the present invention. The method of the present invention can be effectively employed in a wide range of fields, and by following the method, a PVC cup and a metal base material can be firmly bonded with an extremely simple operation.

For example, for manufacturing parts used in various industries such as the building materials industry, vehicle industry, electrical industry, chemical industry, etc., PVC-coated steel plates, iron wires, steel pipes, nets, baskets, etc. used in daily necessities, etc., or wire mesh. It can be used to manufacture reinforced PVC sheets, plates and corrugated sheets. Hereinafter, the present invention will be explained in more detail with reference to Examples.

In addition, parts in the examples mean parts by weight unless otherwise specified. Example 1 100 parts of PVC, dioctyl phthalate (hereinafter referred to as DOP)
It is written as

), 1 part of lead stearate, and the polyvalent metal salts of methacrylic acid shown in Table 1 were thoroughly mixed, and the mixture was heated at 150°C.
Knead for 5 minutes at a roll temperature of
．． 2) A PVC sheet with a thickness of 3 mm was obtained by sheeting. This sheet and the diameter 0.3m shown in Table 1
Using a metal wire of n, preheat at a temperature of 170°C for 5 minutes, heat and pressurize it at the same temperature and pressurize at a pressure of 50 to 60 kg/Cd for 15 minutes, then cool it to room temperature, and the metal wire
0 Pilgrimage embedded thickness 6m77! , width 25mm 1 length 7
A 5 mm test piece was obtained. 50mm/m of metal wire from the test piece
It was pulled out at a speed of ln, and the force required to pull it out 30 mm was measured. The results were as shown in Table 1.
Example 2 100 parts of PVC, 1 part of DOP3O, 1 part of stearic acid,
1 part tribasic lead sulfate and 5 parts calcium methacrylate
After thoroughly mixing the components, the mixture was kneaded using the same equipment and conditions as in Example 1 to form a sheet.

This sheet was placed in a mold, preheated at 17°C for 1 minute, and pressed at 50 kg/d for 1 minute to obtain a sheet having a smooth surface and a uniform thickness of 0.3 mm. The thus obtained sheet and the degreased and washed mild steel plate were loaded into a mold, preheated at 170° C. for 5 minutes, and then bonded by applying pressure at 50 kg/d for 5 minutes. In order to test the adhesion to a mild steel plate, the mild steel plate to which the PVC sheet was adhered was cut into 20 mm width pieces, and one PVC layer was attached.
The force required to peel 50 mm/Mln in the 8' direction was measured and found to be 6.9 kg. For comparison,
An attempt was made to bond PVC and a mild steel plate without using calcium methacrylate, but no bonding occurred. Example 3 After thoroughly mixing 100 parts PVC, parts DOP3O, 1 part stearic acid, 1 part dibasic phosphorous acid and 3 parts methacrylic acid, 1
Thoroughly knead for 0 minutes and make a sheet of PV with a thickness of 3 mm.
A C sheet was obtained.

Using the PVC sheet thus obtained, it was adhered to a galvanized steel plate in the same manner as in Example 2 to prepare a test piece.
Regarding this test piece, the force required for 1800 peeling was measured in the same manner as in Example 2. The result is 5.
It weighed 3 kg. Example 4 A metal plate to which a PVC sheet was adhered was obtained in the same manner as in Example 2, except that the metal plate shown in Table 2 was used instead of the mild steel plate.

Claims (1)

[Claims] 1. A polyvalent metal salt of methacrylate selected from the group consisting of aluminum methacrylate, zinc methacrylate and calcium methacrylate is added at a ratio of 0.1 to 10.0 parts by weight to 100 parts by weight of vinyl chloride resin. A method for adhering a vinyl chloride resin and a metal base material, the method comprising melting a vinyl chloride resin composition obtained by mixing and bringing it into close contact with the metal base material.