JPH0768357B2 - Manufacturing method of composite resin - Google Patents

Description

The present invention relates to a method for producing a composite resin composed of a thermoplastic resin and a metal.

[Conventional technology]

This type of composite resin is a mixture of thermoplastic resin pellets and metal powder obtained by crushing, kneading the molten resin and the metal powder with a screw or the like while heating and melting the pellets, and mixing the metal powder in the molten resin. It consists of dispersed materials.

(Problems to be Solved by the Invention) In the above method, it takes time to produce fine metal powder, and also due to difference in specific gravity between particles of pellet and metal powder,
Since it is difficult to uniformly disperse the metal powder in the molten resin and mass production is difficult, there are problems such as being expensive.

The present invention was conceived in order to solve the above problems, and its object is to disperse fine metal particles uniformly in a thermoplastic resin by vacuum deposition of metal and melting of the resin. Another object of the present invention is to provide a new composite resin manufacturing method.

[Means for solving problems]

The present invention according to the above-mentioned object is to vapor-deposit a metal film on a thermoplastic resin film or sheet, heat and melt the vapor-deposited film or sheet, and disperse the metal fine particles forming the metal film in the molten resin. By compounding a plastic resin and a metal, the above-mentioned conventional problems can be solved.

The metal can be vapor-deposited on the above-mentioned film or sheet by applying ordinary vacuum vapor-depositing means as it is, and the metal can be vacuum-deposited, for example, aluminum, copper, gold, silver, tin, iron, etc. Can be used.

The composite ratio of the thermoplastic resin and the metal can be arbitrarily adjusted by changing the thickness of the film or sheet or the deposition amount of the metal, and the production thickness of the metal film in the usual vacuum deposition is the film. Alternatively, although it is in the range of 40 Å to 2000 Å on one side of the sheet, vapor deposition on both sides is also possible, so the composite amount of metal particles is not limited and is not limited. Furthermore, by depositing one metal on one surface and a different metal on the other surface, it becomes possible to combine a resin and a plurality of metals.

It is preferable that the vapor deposition film or sheet is heated and melted in a wound state or a state in which the vapor-deposited film or sheet is cut into desired dimensions and stacked. This is because, in such a state, the film or sheet and the vapor-deposited film of the metal are alternately superposed on each other, and if the heating and melting are performed under such a state, they are easily dispersed uniformly.

The main uses of the composite resin produced by the present invention are not only general synthetic resin molded products but also a wide range of films, nets, synthetic fibers, wire rods, hot metal agents, etc., especially for electromagnetic shielding boxes or Sheet, cool,
Used for heat-insulating boxes, sheets, fibers or futons, jackets, etc., as well as reflective sheets, conductive sheets, conductive synthetic paper, or trays for microwave ovens for browning using synthetic paper. In that case, it exerts a great effect.

It can also be used as a material for packaging containers such as synthetic resin bottles produced by blow molding and as an intermediate layer material for multi-layer molded products, in which case the gas barrier properties and heat resistance are improved.

〔Example〕

(1) A 0.1 mm polyethylene terephthalate film is continuously fed to a vacuum vapor deposition device having a normal structure to deposit an 800 Å aluminum film on one side of the film. This vapor-deposited film is put into a hopper of an extruder equipped with a screw equipped with a heating device, and heated and melted at a temperature of 280 ° C. to be supplied to the extruder. In the extruder, the rotation of the screw mixes the molten resin with the aluminum fine particles produced by the melting. By this kneading for a short time, compounding is uniformly performed. The linearly extruded composite resin has a gray color, and when it is further cut into pellets, the cross section has a metallic luster.

(2) The vapor-deposited film obtained in Example (1) above was fed again to the vacuum vapor deposition apparatus without being melted, and an 800 Å aluminum film was vapor-deposited on the opposite film surface.
This film was melted in the same manner as in Example (1) and then processed into pellets.

The color of the pellets was dark gray, and the cross section thereof had a metallic luster more than that of Example (1).

(3) With the same means as in Example (2) above, the thickness of
100 Å of gold was deposited on one side of a 2 mm polyethylene film, and 200 Å of silver was deposited on the other side of the film. This vapor-deposited film was heated and melted in the same manner as in the above example to obtain a composite resin pellet of polyethylene, gold and silver.

The pellets were entirely light gold and had a metallic luster in cross section.

〔The invention's effect〕

According to the present invention, a metal film made of metal fine particles is formed on a thermoplastic resin film or sheet by vacuum vapor deposition, and the metal fine particles and resin are combined by heating and melting the vapor-deposited film or sheet. The production of metal particles is easier than in the case, and the particles are also finer, so that they are evenly dispersed in the molten resin.

In addition, since the composite resin material can be formed by simply heating and melting the vapor-deposited film or sheet and pelletizing it, the number of steps is small and mass production is possible, so that the manufacturing cost is reduced.

Furthermore, the ratio of resin and metal can be freely changed by adjusting the thickness of the film or sheet and the amount of vapor deposition, so that various ratios of composite resin can be manufactured in the same process. Have.

Claims (1)

[Claims] 1. A thermoplastic resin in which a metal film is vapor-deposited on a thermoplastic resin film or sheet, the vapor-deposited film or sheet is heated and melted, and the fine metal particles forming the metal film are dispersed in the molten resin. A method for producing a composite resin, which comprises compounding a metal with a metal.