JP2001301027A - Rustproof film for metal product - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a rustproof film of high quality containing a rustproofing agent uniformly in a film raw material in the rustproof film for packaging and containing a metal product needed for its rustproofing, and a method for manufacturing the same. SOLUTION: In a first step, a thermoplastic resin, a main raw material for a film stock and a sublimable organic special acid amine salt fine powder as the rustproofing agent are kneaded at a low temperature and low pressure to form a coarse particle pellet. Then, in a second step, the main raw material is mixed with the coarse particle pellet, and melted to form a rustproof pellet. Finally, in a third step, the main raw material is mixed with the rustproof pellet, melted, pressurized and an tubular film is extruded. Thus, a extruded film product is provided by the material obtained by melting, mixing and uniformly integrating as divided into the three steps.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a metal product rust-preventive film for packaging a metal product requiring rust prevention for a fixed period of time to prevent oxidative corrosion.

[0002]

2. Description of the Related Art As a method of rust-preventing and packaging metal products, metal products are dipped in rust-preventive oil to form a grease coating on the metal surface and stored in a non-breathable resin film bag. Was common. A method of accommodating a metal product in a bag-shaped rust-preventive paper impregnated with a rust-preventive agent and enclosing and storing a solid or powdered rust-preventive agent and a metal product in the above-described impermeable resin film has also become widespread. These methods require a preparation step for rust prevention when the resin film is stored.

[0003]

SUMMARY OF THE INVENTION It is an object of the present invention to omit a step for storing a resin film of a metal product as described above. When metal products are used later, they must be removed from the resin film, the rust-preventive oil must be washed and removed, and the rust-proof paper and rust-preventive agent must be removed and treated as industrial waste. The objective is to omit these steps.

[0004]

The metal product rust preventive film of the present invention has the following constitution in order to achieve the above-mentioned object. A, a sublimable organic amine salt of an organic acid is used as a rust inhibitor 2, and the rust inhibitor is added to the thermoplastic resin raw material 1 in an amount of 10% to 30%.
(Weight ratio), heated to 80 to 100 ° C., extruded by an appropriate kneading means and an extruder, and then supplied to a granulator via a cooling means to form coarse pellets 5. To manufacture. B: The thermoplastic resin raw material 1 and the coarse-grained pellets 5 are mixed, supplied to a heating extruder, heated to 170 to 180 ° C., extruded from a linear die 28, and then formed through a cooling means. The pellets are supplied to a granulator 19 to produce rust-proof pellets 18. C, the thermoplastic resin raw material 1 and the rust-preventive pellets 18 were mixed and supplied to an extrusion inflation molding machine.
C. to 180.degree. C. and inflation molding to produce a metal product rust prevention film 32. FIG.

[0005]

The amine salt of an organic special acid, which is a chemical agent exhibiting a rust-preventing action, of the present invention is a sublimable fine powder and has a property that it is hardly compatible with a thermoplastic resin raw material which is a main raw material of a film. Therefore, it is extremely difficult to distribute a uniform rust inhibitor simply by heating and mixing, and unless the rust inhibitor is uniformly contained inside the film material, it can be used as a rust preventive film to prevent metal oxidation. Cannot be expected to have a highly reliable commercial effect. That is, unless the content of the rust preventive agent is constant and evenly distributed and the rust preventive effect is not guaranteed to be a constant value for the same item, metal rust prevention for a certain period cannot be guaranteed as a rust preventive film.

According to the present invention, a rust inhibitor is mixed with a thermoplastic resin raw material, and in the first step, coarse pellets are formed at low temperature and low pressure, and in the second step, the coarse pellet and another thermoplastic resin raw material are mixed. After uniform mixing, the mixture is treated at a higher temperature and a higher pressure than in the first step to form rustproof pellets.

Finally, in a third step, a rustproof film is produced by mixing the rustproof pellets again with a thermoplastic resin raw material and performing inflation at a high temperature and a high pressure. Thus, the rust inhibitor and the thermoplastic resin raw material are mixed and kneaded in three stages. Therefore, it is possible to obtain a very uniform distribution of the rust preventive agent and to manufacture a reliable rust preventive film.

When a metal product is packaged with the above rust-preventive film, the fine particles of the organic special acid amine salt contained in the film gradually sublime inside the package, and the sublimation gas penetrates into the details of the metal product, and the surface of the metal product Prevent oxidation. Further, as described above, the distribution of the rust preventive is uniform, and a highly reliable rust preventive effect can be guaranteed.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. However, in the following examples, the steps for embodying the technical idea of the present invention are illustrated by specific devices, and the present invention is not specified by the devices of the examples. Further, in this specification, in order to make it easy to understand the claims, the numbers corresponding to the members shown in the embodiments are referred to as “claims” and “means for solving the problems”. Are added to the members indicated by "." However, the members described in the claims are not limited to the members of the embodiments.

[0010]

EXAMPLE a As a rust preventive as a chemical for protecting a metal from rust, a sublimable organic special acid amine salt is used.

B In FIG. 1, a thermoplastic resin pellet 1, which is a main raw material of a film material, and the rust preventive agent 2 are put into a low-temperature heating kneader and heated and kneaded. The low-temperature heating kneader is a mixing roll 3 that steam-heats to a pair of upper and lower 80 to 100 ° C. and reverses each other at a small interval as shown in the figure. In FIG. , Is extruded to the right in a sheet-like shape.

(C) Next, the raw material sheet is formed into a coarse pellet 5 of a thermoplastic resin containing a rust inhibitor by a cooling granulator 4 comprising a series of equipment. First, the material sheet is cut in a vertical direction at a constant width by a vertical cutting roll 9 to form a plurality of parallel linear shapes.
Sent to. The air cooler 7 continuously injects air with a blower 8 to cool the material to room temperature. The raw material is then supplied to a horizontal cutter type granulator 6, which cuts the linear raw material in the vertical direction to form coarse pellets 5.

In FIG. 2, the coarse-grained pellets 5 and another thermoplastic resin pellet 1 of the main raw material are supplied to the mixer 10 at a ratio (weight ratio) of 1 to 10 coarse-grained pellets to 100 thermoplastic resin pellets. The mixture is mixed for several minutes to tens of minutes, and then supplied to the screw press 13.

The e-screw press 13 is heated to 170 to 180 ° C. by a built-in heater 12, pressurized by a rotating screw 14, pressed rightward in the figure, and continuously extruded from a die 28 in a linear shape. It is.

F Next, the mixture is cooled to room temperature by a cooling granulator 15 composed of a series of devices and pelletized.
First, the linear molten resin 33 is molded by being sandwiched between a pair of upper and lower cylindrical take-up rolls 17 rotating in opposite directions to each other, then air-cooled by the air cooler 16 and further subjected to a horizontal cutting type granulation. Rust preventive pellet 1
Molded as 8 and taken out.

The shape of the g take-off roll 17 is shown in FIG. 3. A groove 20 is formed in the lower roll, and the molten resin 33 passes through the groove 20 and is pressed and molded.

H In FIG. 4, the rustproof pellets 1 are added to the thermoplastic resin pellets 100 in the upper left mixer 10.
To 10% (weight ratio) and mixing operation.

Next, the uniformly mixed raw material is supplied to a known blown film manufacturing apparatus. First, it is supplied to the hopper of the screw type extruder 20. Next, 170 to 18 by the heater of the heating belt 21.
It is heated and melted to 0 ° C., extruded to the right, supplied to the film die 27, extruded cylindrically upward from the die, expanded by internal pressure from the air pressure source 23, and wound up as a film material as shown in the figure. The rust-preventive film 32 is wound up and stored in the device 31.

J The rust-preventive film of the present invention is, as described above,
The thermoplastic resin raw material, which is the main raw material of the film material, and the sublimable organic special acid amine salt fine powder as a rust inhibitor are melt-mixed in three stages and uniformly integrated. A table is shown.

In FIG. 5, in the first step, the rust inhibitor and the main raw material are melt-kneaded by heating at about 100.degree. C. by steam, pulled out with little pressure, cooled to room temperature, and cut to obtain coarse pellets. Create.

In the second step, the above-mentioned coarse-grained pellets are uniformly and sufficiently mixed with the main raw material by a mixer, and then supplied to the die at a higher temperature and pressure than in the first step by a heated screw press, and the linear raw material is fed from the die. Pull out and tighten with take-off rolls to cool and granulate to form rust-proof pellets.

Next, in the third step, the rust-preventive pellets are uniformly mixed with the main raw material by a mixer, and the material is pressed into a film die under a high temperature and a high pressure by a known ordinary blown film manufacturing apparatus, and the inside is pneumatically pressurized. And then cooled to produce a rustproof film.

The organic special acid amine salt as a rust preventive is a sublimable fine powder and has a property that it is hardly compatible with a thermoplastic resin raw material which is a main raw material of a film. Therefore, it is extremely difficult to distribute a uniform rust inhibitor simply by heating and mixing, and unless the rust inhibitor is uniformly contained inside the film material, it can be used as a rust preventive film to prevent metal oxidation. Cannot be expected to have a highly reliable commercial effect.
That is, unless the content of the rust preventive agent is constant and uniformly distributed and the rust preventive effect is not guaranteed at a constant value for the same item, metal rust prevention for a certain period cannot be guaranteed as a rust preventive film.

[0024]

According to the present invention, as described above, the rust inhibitor is mixed with the main raw material, and in the first step, coarse pellets are formed at a low temperature and a low pressure, and in the second step, the coarse pellets and another main raw material are formed. Are uniformly mixed and then treated at a higher temperature and a higher pressure than in the first step to form rustproof pellets. Finally, in the third step, the main material is mixed again with the rust-preventive pellets, and the mixture is subjected to inflation at a high temperature and a high pressure to produce a rust-preventive film. Accordingly, a very uniform distribution of the rust preventive agent is obtained, and a reliable rust preventive film can be manufactured.

When a metal product is packaged with the rust-preventive film, the fine particles of the organic special acid amine salt contained in the film gradually sublime inside the package, and the sublimation gas penetrates into the details of the metal product, and the surface of the metal product Prevent oxidation. Further, as described above, the distribution of the rust preventive is uniform, and a highly reliable rust preventive effect can be guaranteed. Also, the process and the generation of industrial waste are smaller than those of the rust-proof packaging method using dipping in rust-proof oil or using rust-proof paper.

[0026]

[Brief description of the drawings]

FIG. 1 is a principle diagram showing a process of kneading and heating a rust inhibitor and a thermoplastic resin material, and then cooling the mixture to room temperature to form a coarse pellet.

FIG. 2 is a principle view showing a process of mixing a thermoplastic resin raw material with the coarse-grained pellet, heating and melting, extruding under pressure, and cooling at room temperature to form a rustproof pellet.

FIG. 3 is a bird's-eye view of a take-up roll.

FIG. 4 is a principle diagram showing a process of mixing a thermoplastic resin raw material with the rust-preventive pellets, heating and melting, extruding under pressure, and processing an inflation film to produce a rust-preventive film.

FIG. 5 is a production process diagram of a rustproof film.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Thermoplastic resin raw material 2 ... Rust preventive agent 3 ... Mixing roll 4 ... Cooling granulation apparatus 5 ... Coarse-grain pellets 6 ... Granulator 7 ... Empty cooler 8 ... Blower 9 ... Vertical cutting roll 10 ... Mixer 11 ... Hopper 12 ... Heater 13 ... Screw press 14 ... Screw 15 ... Cooling granulator 16 ... Empty cooler 17 ... Take-up roll 18 ... Rust prevention pellets 19 ... Granulator 20 ... Groove 21 ... Heating belt 22 ... Driving unit 23 ... Empty Pressure source 24 ... Blower 25 ... Screw 26 ... Air cooling ring 27 ... Die 28 ... Die 29 ... Stable plate 30 ... Pinch roll 31 ... Winding device 32 ... Rust prevention film 33 ... Molten resin

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (reference) C23F 11/00 C23F 11/00 GB29K 105: 16 B29K 105: 16 B29L 7:00 B29L 7:00 C08L 101: 00 C08L 101: 00 F term (reference) 3E067 AA11 AB49 BB14A BB22A CA00 CA30 FC01 GA25 4F071 AA02 AC12 AD02 AE22 AH04 BA01 BB06 BB09 BC01 4F201 AB06 AC01 AG01 BA02 BA03 BC01 BC02 BC03 BC13 BC19 BC21 BD05 BK02 BK13 BK12 BK13 BK12 BK13 BK12 BK13 BK13 BK02 BN11 BN18 BQ04 BQ05 BQ07 BQ10 BQ11 BQ12 4F210 AB06 AC01 AG01 QA01 QC05 QD01 QG02 QG18 QK01 QK12 QK72 4K062 AA05 AA08 BB12 EA12 GA08

Claims (1)

[Claims] 1. A rust-preventive film for a metal product, which is produced by the following raw materials and processes. A, a sublimable organic amine salt of an organic acid is used as a rust inhibitor 2, and the rust inhibitor is added to the thermoplastic resin raw material 1 in an amount of 10% to 30%.
(Weight ratio), heated to 80 to 100 ° C., extruded by an appropriate kneading means and an extruder, and then supplied to a granulator via a cooling means to form coarse pellets 5. To manufacture. B: The thermoplastic resin raw material 1 and the coarse-grained pellets 5 are mixed, supplied to a heating extruder, heated to 170 to 180 ° C., extruded from a linear die 28, and then formed through a cooling means. The pellets are supplied to a granulator 19 to produce rust-proof pellets 18. C, the thermoplastic resin raw material 1 and the rust-preventive pellets 18 were mixed and supplied to an extrusion inflation molding machine.
C. to 180.degree. C. and inflation molding to produce a metal product rust prevention film 32. FIG.