JP2003246022A - Rust-proofing sheet and its production method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method for easily producing a rust-proofing sheet high in strength and excellent in rust-proofing effect. <P>SOLUTION: A process for producing a constituent member from a raw material 11a comprising a molten resin containing a rust-proofing agent is provided. The constituent member is produced by extruding the raw material 11a by a T-die extrusion method. In the process, the temperature of the raw material 11a is preferably kept at 260°C or below. The rust-proofing agent is not vaporized so that the rust-proofing sheet excellent in rust-proofing effect and high in strength can be produced. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rust preventive sheet used as a packaging material for metal materials and the like, and more particularly to a rust preventive sheet which has high strength and can be easily manufactured, and a manufacturing method thereof.

[0002]

2. Description of the Related Art When a metal material is stored or transported, it is packed with a rust preventive sheet for the purpose of preventing the rust of the metal material.

As the conventional rust preventive sheet, a paper material coated with a rust preventive agent or a paper material impregnated with a rust preventive agent is used. However, the rustproof sheet made of paper material has low strength and high manufacturing cost. In addition, paper materials are difficult to recycle and waste paper materials, which is not preferable from the viewpoint of environmental protection.

Therefore, it is desired to use a resin sheet containing a rust preventive agent as the rust preventive sheet. However, since a general rust preventive agent is a vaporizable one containing nitrogen such as amine, if the rust preventive agent is heated at a high temperature in the process of manufacturing the rust preventive sheet, the process of manufacturing the rust preventive sheet will proceed. May vaporize. Therefore, as a method of producing a resin using a resin at a relatively low temperature, it has been attempted to form a film from a resin material containing a rust preventive by an inflation method.

However, since the resin film formed by the inflation method has a small film thickness and low strength, it is necessary to have a multilayer structure. Therefore, the manufacturing process becomes complicated and expensive.

The present invention solves the above-mentioned conventional problems, and is formed of a resin material containing a rust preventive agent, has high strength, and has a low probability of vaporization of the rust preventive agent during manufacturing, and a rust preventive sheet thereof. It is intended to provide a manufacturing method.

[0007]

According to the present invention, in a multi-layered sheet having a substrate and a laminated resin layer laminated on one side or both sides of the substrate, at least one laminated resin layer is It is characterized in that a resin material containing a rusting agent is melt-extruded and laminated on the base material.

For example, the base material is any one of a cloth material, a non-woven cloth, and a resin film formed of resin fibers.

Further, the present invention provides a sheet having a multi-layer structure having a base material and a laminated resin layer melt-extruded on one or both sides of the base material, wherein the base material melts a resin material containing a rust preventive agent. It is characterized by being an extruded resin film.

Further, a laminating material may be provided which is laminated on the base material with the laminating layer sandwiched therebetween. In this case, the laminating material is a cloth formed of resin fibers. It is made of any of material, non-woven fabric, and resin film.

Further, the present invention provides a method for producing a sheet having a multi-layer structure in which a resin material is melt-extruded on one or both sides of a base material to laminate a laminated resin layer, and at least one laminated resin layer is coated with a rust preventive agent. It is characterized in that a resin material containing the same is melt-extruded as a raw material.

Further, the present invention is a method for producing a sheet having a multi-layer structure in which a laminated resin layer is formed by melt extrusion on one or both sides of a base material, wherein the base material is made of a resin material containing a rust inhibitor. The laminated resin layer is formed by a melt extrusion process, and a resin is melt extruded on the base material to form the laminated resin layer.

In this case, the laminated resin layer is
It is preferable to extrude and laminate so as to have a resin temperature of 80 ° C. or less, or to extrude and form the base material so as to have a resin temperature of 280 ° C. or less.

For example, polyethylene resin containing 5 to 5 rust inhibitors
Using pellets contained in the range of 40% by mass, the pellets and the resin material are mixed and melt-extruded.

Further, by making the polyethylene resin of the pellets low-density polyethylene, the temperature of the resin at the time of melt extrusion can be set to 180 ° C. or lower.

Further, it may have a step of bonding a bonding material to the base material via the laminate resin layer.

In the present invention, the laminate resin layer or the base material is melt-extruded using a resin containing a rust preventive under the condition that the resin temperature is 280 ° C. or lower, so that the rust preventive is vaporized in the melt extrusion step. Can be prevented. Further, in order to prevent vaporization of the rust preventive agent, it is more preferable that the temperature of the molten resin containing the rust preventive agent is 260 ° C. or lower, further 200 ° C. or lower, and further 180.
It is preferable that the temperature is not higher than ° C. Further, in order to enable melt extrusion, the temperature of the molten resin is preferably set to 170 ° C. or higher.

In the melt extrusion step, pellets containing a rust preventive agent in polyethylene resin in the range of 5 to 40% by mass are used, and the pellets are mixed with the resin material forming the resin layer. It is preferable to use the mixture as a raw material.

In this method, by changing the mixing ratio of the pellets and the resin material, it becomes possible to arbitrarily set the content rate of the rust preventive agent at a relatively low rate.

The polyethylene resin of the pellets is low density polyethylene, and the temperature of the molten resin at the time of melt extrusion is preferably set to 180 ° C. or lower.

When the resin of the pellets is low-density polyethylene, it becomes possible to melt-extrude at a low temperature of 180 ° C. or less, and it is easy to prevent vaporization of the rust preventive agent. Further, the melting temperature of the resin forming the resin layer is more preferably low density polyethylene.

[0022]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 is a process chart for explaining a method for producing a rust preventive sheet of the present invention, and FIG. 2 shows a first embodiment produced by the method for producing a rust preventive sheet of the present invention. It is sectional drawing which shows a rust preventive sheet.

The rust preventive sheet 1 shown in FIG.
It is used as a packaging material when carrying it. More specifically, it is used as a wrapping material for wrapping the surface of a steel plate or the like wound in a tubular shape.

The rust preventive sheet 1 is formed of a polyethylene (PE) cloth 10 formed by weaving a yarn whose base material is polyethylene fiber, and the upper surface of the PE cloth 10 (the surface on the A side in the figure). Then, the laminated resin layer 11 made of PE resin is formed by melt extrusion. Then, a polypropylene (PP) film 12, which is a reinforcing bonding material, is laminated via the laminate resin layer 11.

The laminate resin layer 11 contains an anticorrosive agent containing amine as a main component. This rust inhibitor is
Since nitrogen constituting the amine bonds with oxygen in the air, it inhibits the bond between the metal and oxygen and exerts a rust preventive effect.

Therefore, when the rust preventive sheet 1 is used as a metal packaging material, the rust preventive agent contained in the laminate resin layer 11 is vaporized and filled around the metal to be packaged, and It can exert a rust effect and prevent metal oxidation.

At this time, when the rust preventive agent is present on the surface of the rust preventive sheet that comes into contact with the metal, the rust preventive agent vaporizes in a short period of time, and the amount required for the rust preventive of the metal is increased. The rust preventive agent exceeding the above condition temporarily fills the surroundings of the metal, but after the vaporized rust preventive agent is scattered, the rust preventive agent is reduced, so that the rust preventive effect cannot be maintained for a long time. However, the rustproof sheet 1
Then, since the rust preventive agent is present at the position sandwiched between the PE cloth 10 and the PP film 12, as compared with the case where the rust preventive agent is present on the metal-contacting surface of the rust preventive sheet. The rate of vaporization of the rust preventive is slow. Therefore, the vaporization rate of the rust preventive agent can be appropriately maintained and the rust preventive effect can be maintained for a long period of time.

Next, a method for manufacturing the rust preventive sheet 1 will be described. As shown in FIG.
The E-cross 10 is placed and supplied. The conveyor 2
0 moves continuously in the direction of arrow C in the figure at a constant speed.

The first installed on the conveyor 20
In the melt extruder 30, a raw material 1 for forming the laminated resin layer 11 is provided in a hopper 31 installed above the melt extruder.
1a is thrown in. The raw material 11a is a mixture of a polyethylene resin material for forming the laminate resin layer 11 and pellets containing a rust preventive agent. The polyethylene resin material is low density polyethylene (LDPE) having a relatively low melting temperature. The pellets are low density polyethylene containing a rust preventive agent, and the content ratio of the rust preventive agent to the pellets is about 5 to 40% by mass. In the raw material 11a in which the pellets and the polyethylene resin are mixed, the content rate of the rust preventive agent is 0.5.
It becomes about 5% by mass.

Since the raw material 11a is mainly composed of a low density polyethylene resin, and the melt flow rate (MFR) of the raw material 11a is in the range of 45 to 55, the raw material 11a is heated to a resin temperature of 280 ° C. or lower. Can be melt-extruded, and preferably melt-extruded at a resin temperature of 200 ° C. or lower. Furthermore 1
It is also possible to perform melt extrusion at a resin temperature of 80 ° C. or lower.

As the polyethylene resin material, for example, JMA07N manufactured by Japan Polyolefin Co., Ltd. is preferably used.

The raw material 11 charged into the hopper 31
The layer a is made into the laminate resin layer 11 by a melt extrusion method using a T die.

In this specification, the "melt extrusion method using a T die" means that when a die adapter is attached, T
It means a processing method in which a die having a character shape is installed in a melt extrusion machine and a molten resin is extruded to mold the resin into a sheet.

In the embodiment shown in FIG. 1, the raw material 11a is used.
Is extruded onto the upper surface of the PE cloth 10 while being heated, melted, kneaded, and extruded by the first melt extruder 30 while being molded into a sheet shape from the slit of the T die 32. The resin extruded at this time is mainly low-density polyethylene, and since the MFR is in the range of 45 to 55, it can be extruded at a relatively low temperature. As described above, the temperature of the molten resin at the time of extrusion is 280 ° C. The temperature is kept below, preferably kept at 200 ° C. or lower, and more preferably kept at 180 ° C. or lower. Further, in order to enable melt extrusion, the temperature of the molten resin is preferably set to 170 ° C. or higher.

Thus, by melting and extruding the raw material 11a at a relatively low temperature, it is possible to reduce the probability that the rust preventive agent vaporizes.

In the embodiment shown in FIG. 1, the PE cloth 1 is used.
Immediately after the laminated resin layer 11 is formed on the laminated resin layer 11, the polypropylene (PP) resin is extruded on the laminated resin layer 11 in the melt extrusion process using the second melt extruder 40 and the T die 42. Stacked.
The PP film 12 is formed by the second melt extruder 40. The PP film 12 has the low density PE.
Is laminated on the PE cloth 10 through a laminating resin layer 11 mainly composed of.

The rust preventive sheet 1 produced in the above process is PE
The cloth 10 is used as a base material, and the P
Since the P film 12 reinforces the PE cloth, the strength is high, and the laminating resin layer 11 and the PP film 1 are also strong.
In No. 2 as well, a relatively large film thickness can be formed by a melt extrusion process using a T-die, so that it has high strength. Also,
Since the laminate resin layer 11 has a relatively large film thickness, the amount of the rust preventive contained in the laminate resin layer 11 can be increased, so that a rust preventive sheet having a large rust preventive effect can be obtained. is there.

FIG. 3 is a sectional view showing a rust preventive sheet of the second embodiment manufactured by the manufacturing method of the present invention. Of the rustproof sheet 2 shown in FIG. 3, the same components as those of the rustproof sheet 1 shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.

The rust preventive sheet 2 is made of the PE as a base material.
A laminating resin layer 15 containing a rust preventive is laminated on the lower surface (the surface on the B side in the drawing) of the cloth 10 by a melt extrusion process. Then, the PP film 12 is laminated on the upper surface (the surface on the A side in the drawing) of the PE cloth 10 as a bonding material via the laminate resin layer 13 made of PE resin containing no rust preventive agent. .

Here, the bonding material in the present specification means a sheet formed in a step different from that of the base material and bonded to the base material via the laminate resin layer.

The structure of the rust preventive sheet 2 can also provide a metal rust preventive effect, and the strength as a whole can be made higher than that of the rust preventive sheet 1 shown in FIG.

The rust preventive sheet 2 forms a laminated body in which the PE cloth 10, the laminated resin layer 11 and the PP film 12 are laminated, and the back surface side of this laminated body, that is, the back surface side of the PE cloth 10 is illustrated. In the same way as method 1,
Pellets composed of low density polyethylene and a rust preventive, and a mixture of low density polyethylene as a raw material,
The laminate resin layer 15 is formed by melt extrusion using a die.

FIG. 4 is a sectional view showing the rust preventive sheet 3 of the third embodiment manufactured by the manufacturing method of the present invention.
Of the rust preventive sheet 3 shown in FIG. 4, the same components as those of the rust preventive sheet 1 shown in FIG. 2 or the rust preventive sheet 2 shown in FIG. To do.

The rust preventive sheet 3 is the PE cloth 10
A laminated resin layer 14 containing a rust preventive agent is formed on the upper surface (the surface on the A side in the drawing) of the polyethylene resin via a resin layer 13 for adhesion of a polyethylene resin containing no rust preventive agent. The laminate resin layer 14 has a function of reinforcing the PE cloth 10 and a rust preventive function.

In the same manner as in the method shown in FIG. 1, the laminate resin layer 14 is made of a mixture of low density polyethylene and pellets of low density polyethylene and a low density polyethylene, which is melted using a T-die. It can be formed by extrusion.

FIG. 5 is a cross-sectional view showing the rust preventive sheet 4 of the fourth embodiment manufactured by the manufacturing method of the present invention.
Of the rustproof sheet 4 shown in FIG. 5, the same components as those of the rustproof sheet 1 shown in FIG. 2 are designated by the same reference numerals, and the description thereof will be omitted.

The rust preventive sheet 4 is the PE cloth 10
Is a two-layer structure in which the laminate resin layer 11 containing the rust preventive agent is formed on the upper surface of the. With such a structure, a rust preventive sheet having a metal rust preventive effect can be easily manufactured at low cost.

In the same manner as in the method shown in FIG. 1, the rust preventive sheet 4 is formed on the upper surface of the PE cloth 10 with a pellet made of low density polyethylene and a rust preventive, and a raw material made of a mixture of low density polyethylene. It can be manufactured by melt extrusion using a T-die to form the laminate resin layer 11.

In each of the rust preventive sheets 1, 2, 3 and 4 shown in FIGS. 2 to 5, the case where the PE cloth 10 is used as the base material has been described as an example, but the present invention is not limited to this. However, a resin film made of PE, for example, can be used as the base material. In addition, a film formed from a resin such as PE is fibrillated, and the fibers thus obtained are continuously laminated vertically and horizontally, and then a non-woven fabric formed by heat-sealing each fiber, and other known fibers. Various non-woven fabrics can also be used. In addition, kraft paper can also be used.

The rust preventive sheets 1, 2, 3 and 4 shown in FIGS. 2 to 5 contain the rust preventive agent in the resin layers 11, 14 and 15, and the PE cloth 10 as the base material. In the above, the case where a rust preventive agent is not contained is described as an example, but the present invention is not limited to this, and a resin film melt-extruded with a resin material containing the rust preventive agent is used as a base material. Can be used.

In this case as well, it is preferable to be formed by melt extrusion at a relatively low temperature of 280 ° C. or lower, and using a raw material made of a mixture of the pellets and low density polyethylene, 200 ° C. or lower, or 180 ° C. or lower. It is preferable that the substrate is formed by melt-extruding.

Further, in each of the rust preventive sheets 1 and 2 shown in FIGS. 2 and 3, the case where the bonding material is the PP film 12 has been described as an example, but the present invention is not limited to this. In the same manner as the above base material, for example, a resin film made of PE as a material, a film made of PE as a material is fibrillated, and the fibers thus obtained are continuously laminated vertically and horizontally, and then each fiber is heat-melted. Non-woven fabrics formed by wearing and various other known non-woven fabrics, and kraft paper can also be used.

The resin forming the pellets containing the rust preventive may be the above-mentioned low density polyethylene (LDPE) or ultra low density polyethylene (VLDPE).
Alternatively, linear low density polyethylene (LLDPE) may be used. That is, any polyethylene resin can be used as long as it can be melt-extruded at 280 ° C. or lower, preferably 260 ° C. or lower, more preferably 200 ° C. or lower, further 180 ° C. or lower.

Further, the raw material of the laminate resin layer 11 or the laminate resin layers 14 and 15 is not limited to the one in which pellets containing a rust preventive agent are mixed with the polyethylene resin, and the rust preventive agent is directly mixed with the low density polyethylene resin. It may have been done.

[0055]

According to the present invention, the laminate resin layer or the base material is formed by melt-extruding a resin containing a rust preventive agent using a T-die, so that it can be manufactured at low cost. Moreover, since the resin layer containing the rust preventive agent can be melt extruded at a relatively low temperature using low density polyethylene or the like, the rust preventive agent can be prevented from vaporizing and the rust preventive agent is stably contained. Can be manufactured.

[Brief description of drawings]

FIG. 1 is a process drawing for explaining a method for producing a rust preventive sheet of the present invention,

FIG. 2 is a cross-sectional view showing the rust preventive sheet of the first embodiment manufactured by the method for manufacturing a rust preventive sheet according to the present invention,

FIG. 3 is a sectional view showing a rust preventive sheet according to a second embodiment manufactured by a method for manufacturing a rust preventive sheet according to the present invention;

FIG. 4 is a sectional view showing a rust preventive sheet according to a third embodiment manufactured by a method for manufacturing a rust preventive sheet according to the present invention;

FIG. 5 is a sectional view showing a rust preventive sheet according to a fourth embodiment manufactured by a method for manufacturing a rust preventive sheet according to the present invention,

[Explanation of symbols]

1,2,3,4 rust prevention sheet 10 Polyethylene cloth (base material) 11,13 Laminate resin layer 11a raw material 12 Polypropylene film (laminating material) 14 Laminated resin layer 30 First melt extruder 32 T die 40 Second Melt Extruder 42 T die

   ─────────────────────────────────────────────────── ─── Continued front page    F term (reference) 4F100 AK01A AK01B AK01C AK01D                       AK04B AK04C AK06B AK06C                       AK07 AK63 AR00D AT00A                       BA02 BA03 BA04 BA06 BA07                       BA10B BA10C CA14A CA14B                       CA14C DG10A DG10D DG12A                       DG12D DG15A DG15D EH23                       GB15 YY00B YY00C                 4F207 AA04 AA07 AB01 AD05 AD08                       AD16 AR06 KA01 KA17 KB11                       KM15

Claims (12)

[Claims] 1. A sheet having a multi-layer structure having a base material and a laminate resin layer laminated on one side or both sides of the base material, wherein at least one of the laminate resin layers comprises a resin material containing an anticorrosive agent. An anti-corrosion sheet characterized by being melt-extruded and laminated on a base material. 2. The rust preventive sheet according to claim 1, wherein the base material is any one of a cloth material formed of resin fibers, a non-woven fabric, a resin film, and kraft paper. 3. A multi-layered sheet having a base material and a laminate resin layer melt-extruded on one or both sides of the base material, wherein the base material is a resin material obtained by melt-extruding a resin material containing an anticorrosive agent. A rust preventive sheet characterized by being a film. 4. The rust preventive sheet according to claim 1, further comprising a bonding material bonded to the base material with the laminate layer interposed therebetween. 5. The rust preventive sheet according to claim 1, wherein the laminating material is any one of a cloth material formed of resin fibers, a non-woven fabric, a resin film and kraft paper. 6. A method for producing a sheet having a multi-layer structure in which a resin material is melt-extruded on one or both sides of a base material and laminated with a laminated resin layer, wherein at least one laminated resin layer contains a rust preventive resin material. A method for producing a rust-preventive sheet, which comprises melt-extruding as a raw material. 7. A method for producing a sheet having a multi-layer structure in which a laminate resin layer is formed by melt extrusion on one or both sides of a base material, wherein the base material is melt-extruded using a resin material containing a rust preventive material as a raw material. A method for producing a rust preventive sheet, which comprises forming and laminating a resin on the base material to form the laminated resin layer. 8. The method for producing a rust preventive sheet according to claim 6, wherein the laminate resin layer is extruded so as to have a resin temperature of 280 ° C. or lower and laminated. 9. The method for producing a rust preventive sheet according to claim 7, wherein the base material is formed by extruding the base material so that the resin temperature is 280 ° C. or lower. 10. A polyethylene resin containing an anticorrosive agent in an amount of 5 to 40.
The method for producing an anticorrosive sheet according to claim 8 or 9, wherein the pellets contained in the range of mass% are used, and the pellets and the resin material are mixed and melt-extruded. 11. The polyethylene resin of the pellet,
The method for producing a rust-preventive sheet according to claim 10, wherein low-density polyethylene is used and the temperature of the resin during melt extrusion is 180 ° C. or lower. 12. The method for producing a rust preventive sheet according to claim 6, further comprising a step of bonding a bonding material to the base material via the laminate resin layer.