KR101030778B1 - Sheet for inhibiting corrosion and its manufacturing method - Google Patents

Abstract

The present invention relates to a rust-proof packaging material using a non-woven fabric and hemp fabric made of a polypropylene material, and a method of manufacturing the same. That is, the present invention relates to a vaporizable rust preventive packaging material for coating a vaporizable rust preventive agent on a polypropylene nonwoven fabric and preventing corrosion in the packaging of steel products such as steel coils, metal machinery, and metal parts. And it relates to a method for producing a rust-proof packaging material by heat-bonding polypropylene nonwoven fabric and hemp fabric using a polypropylene resin as an adhesive.

According to the present invention, a polypropylene nonwoven fabric impregnated with a rust preventive agent, a polypropylene hemp fabric, and a polypropylene resin filled between the nonwoven fabric and the hemp fabric to bond the nonwoven fabric and the hemp fabric, characterized in that it comprises a Anti-rust packaging using non-woven fabric and hemp fabric made of polypropylene; Coating the rust preventive agent on a nonwoven fabric made of polypropylene and drying to bind the rust preventive agent to the nonwoven fabric; And a third step of injecting a high temperature polypropylene resin between the nonwoven fabric coated with a vaporizing rust preventive agent and a hemp fabric made of a polypropylene material, and performing high temperature thermal bonding in a T-die manner. Provided are a method for producing a rust-preventive packaging material using a nonwoven fabric and a sack fabric.

Antirust packaging, polypropylene, nonwoven fabric, hemp fabric

Description

Anti-corrosive packaging material using nonwoven fabric and hemp fabric made of polypropylene and its manufacturing method {Sheet for inhibiting corrosion and its manufacturing method}

The present invention relates to a rust-proof packaging material using a non-woven fabric and hemp fabric made of a polypropylene material, and a method of manufacturing the same. That is, the present invention relates to a vaporizable rust preventive packaging material for coating a vaporizable rust preventive agent on a polypropylene nonwoven fabric and preventing corrosion in the packaging of steel products such as steel coils, metal machinery, and metal parts. And it relates to a method for producing a rust-proof packaging material by heat-bonding polypropylene nonwoven fabric and hemp fabric using a polypropylene resin as an adhesive.

[Document 1] Credit Model Registration No. 0146233 (1999.02.25)

Conventional packaging materials are prepared by impregnating a synthetic resin nonwoven fabric with a vaporizable rust preventive agent and drying it at a high temperature. Therefore, a phenomenon in which the width of the nonwoven product decreases due to the high temperature drying and the tension caused by the manufacturing apparatus, the antirust agent is precipitated on the surface of the nonwoven fabric, the wrapping paper becomes sticky, and the rust preventive agent is deposited on the guide roll for moving the nonwoven fabric has a problem of inferior work efficiency. .

And since the anti-corrosive component is expressed on the surface of non-woven fabric, the phenomenon of non-woven fabric and synthetic resin peeling off during thermal bonding occurs, and because it works at high temperature, severe gas and odor are generated due to carbonization of the anti-corrosive agent, and the working environment of the worker is not good and the work efficiency is also improved. There is a problem of deterioration. And due to the high temperature work, the rust inhibitor component is vaporized a lot, the phenomenon that the rust preventive property occurs.

In the case of vaporized rust preventive paper, the wrapping paper is not flexible due to the application of a rust preventive agent on the paper surface, and the workability of the wrapping is reduced, and the paper is dried due to the weather due to the humidity of the paper.

In addition, when paper and synthetic resin products are laminated, different materials are used together, so that the packaging paper after use cannot be recycled and thus disposed of as industrial waste.

The present invention aims to solve the above problems and to provide a packaging material having a rust preventing effect suitable for KS A 2112 vaporizable rust preventive standard (1 type H, L type). In other words, it provides a packaging material with excellent packing suitability without curling of the wrapping paper and having the physical strength suitable for the packaging while having the flexibility of the wrapping paper, and is made of the same material so that it can be easily recycled. The purpose is to provide.

According to the present invention, a nonwoven fabric made of a polypropylene material and a hemp fabric are bonded to each other with a polypropylene resin to use a material of the same material as a rust preventive packaging material. Therefore, there is an effect that can be recycled without disposal as industrial waste after use.

In addition, both the nonwoven fabric and the hemp fabric are made of a polypropylene material, which is excellent in packaging suitability, no curling phenomenon, and excellent strength by drying and heat-sealing at an appropriate temperature, thereby improving the function as a packaging material.

Non-woven fabrics made of polypropylene and anti-rust packaging using hemp fabrics must meet several requirements for packaging steel products such as steel coils.

The first requirement is rust protection, which should be able to protect the metal products by preventing the oxidation of the metal, such as after packing and transporting the steel products.

The second is strength, which requires constant tensile strength, tear strength and burst strength to pack heavy steel coils.

The third is the packing suitability, which is packed by automatic and semi-automatic packing machines when packing steel coils. There are also many cases of manual packaging. In this case, the packaging must be foldable and flexible to facilitate packaging. And most importantly, there should be no curl. When curling occurs, packing work is less efficient and worker fatigue is increased.

Fourth is recyclability. Many developed countries, such as Europe, require the recycling of packaging materials as a waste regulation. By processing raw materials of the same material, it is necessary to finish the role of the packaging material and to be recycled, not industrial waste, to have economical and environmentally friendly features.

The above requirements are achieved by using the polypropylene material of the present invention and by drying and heat bonding at an appropriate temperature.

Antirust packaging using a nonwoven fabric and hemp fabric of the present invention polypropylene has a structure as shown in FIG. That is, the polypropylene nonwoven fabric 1b, the polypropylene hemp fabric 2, and the nonwoven fabric 1b and the hemp fabric 2 that are filled and impregnated with the vaporizing rust preventive agent are filled with the nonwoven fabric 1b and the hemp fabric ( It consists of the polypropylene resin 3 which adheres 2).

The vaporizable anticorrosive agent impregnated in the polypropylene nonwoven fabric 1a, which is a component of the rustproof packaging material, should have a suitable composition for coating on the nonwoven fabric 1a made of polypropylene by a gravure coating method.

When a general vaporizing anticorrosive agent is used, a liquid anticorrosive agent penetrates between fibrous pores of a polypropylene nonwoven fabric, and a certain amount is dried and a predetermined amount is deposited on the surface of the nonwoven fabric. Therefore, there is a problem in that the adhesive is peeled off with the synthetic resin during thermal bonding.

However, in the present invention, it is possible to solve this problem by using a binder mixed with a vaporizable rust inhibitor. In addition, the problem that the rust preventive agent is deposited on the surface of the nonwoven fabric 1a is improved by increasing the penetration force of the rust preventive agent between the fibrous pores of the nonwoven fabric 1a.

As described above, in the present invention, the compound composition of the rust preventive agent has a great feature, and 5 to 15 wt% of triazoles, 5 to 30 wt% of organic acid amine salts, 5 to 30 wt% of fatty acid amine salts, and 5 to 15 wt% of alkaline earth metals. 1 to 10 weight% of binder and 45 to 75 weight% of water or alcohol are comprised.

The above triazoles are 1,2,3-benzotriazole, tolytriazole, 5-chlorobenzotriazole, mercetobenzotriazole, 3-aminotriazole and the like, and may be selected and used one or more of the above. .

The organic acid and fatty acid are salicylic acid, benzoic acid, lactic acid, acetic acid, butyric acid, formic acid, octanoic acid, sebacic acid, caprylic acid, hexanoic acid, lauric acid, stearic acid, and the like. Can be.

And amines are monoethanolamine, dimethylamine, diethylamine, dimethylethanolamine, morpholine, cyclohexylamine, tributylamine, hexamethylenetetraamine, triethylamine, and the like. have.

And alkali earth metals are sodium benzoate, ammonium benzoate, etc., One or more types can be selected and used from the above.

And the binder is polyvinyl alcohol, gum arabic, milk casein and the like, one or more of the above may be selected and used.

The rust preventive performance of the vaporizable rust inhibitors includes initial vapor rust rust resistance and post-exposure vaporization rust preventive effect, which greatly affects the reach and rust life of the rust preventive gas.

In general, in order to increase the initial vaporization, the lower the molecular weight and the higher the vapor pressure, the better the effect. The vaporizable rust preventive property after exposure is advantageous when the higher molecular weight and the lower the vapor pressure. The initial vaporization rust resistance and post-exposure vaporization rust resistance are incompatible with each other. Therefore, the appropriate ingredients must be properly blended to meet the specifications of KS A 2112 vaporizable rust preventive paper (1 type H, L type).

The method for producing the rust-preventive packaging material using the rust preventive agent as described above consists of the following steps.

The first step is a step of coating a vaporizable rust inhibitor having the above composition on the polypropylene nonwoven fabric 1a and drying it. In this step, the rust preventive agent is bound to the polypropylene nonwoven fabric 1a.

The coating amount of the rust preventive agent is 20-23 g / m 2. Usually, about 120 mesh is suitable for the nonwoven fabric 1a.

When a general vaporizing rust preventive agent is used for the polypropylene nonwoven fabric 1a by gravure coating, a liquid rust inhibitor penetrates between the pores of the polypropylene nonwoven fabric 1a, some of which are dried, and some of them are deposited on the surface of the nonwoven fabric, and thus a synthetic resin is applied during thermal bonding. It peels off and does not adhere.

Therefore, in order to improve this problem, in the present invention, by adding a binder to the vaporizable rust preventive agent, the rust preventive agent does not precipitate after penetrating between the nonwoven fabric 1a fibrous pores, and the drying chamber 4 at 90 to 100 ° C. after the rust preventive coating is applied. Through the heating roll 5 at 90 to 100 ° C., the front and rear surfaces are directly in thermal contact with each other, thereby allowing the anti-rust agent to be firmly attached to the fibrous pores of the nonwoven fabric 1a.

In the present invention, the vaporizing rust preventive agent is coated on the polypropylene nonwoven fabric 1a by a gravure coating method, and dried and bound.

Conventionally, by impregnating a synthetic resin nonwoven fabric with a vaporizing rust inhibitor and drying at a high temperature, a phenomenon in which the width of the nonwoven product decreases due to mechanical tension occurs, and a rust preventive agent is deposited on the surface of the nonwoven fabric so that the wrapping paper becomes sticky, and a rust preventive agent is deposited on each guide roll. The efficiency fell. In addition, since the anti-corrosive component is expressed on the surface of the non-woven fabric, the phenomenon of non-woven fabric and synthetic resin peeling off during heat bonding occurs, and at high temperatures, the working environment of the worker is not good due to the severe gas and odor due to the carbonization of the anti-corrosive agent, and the work efficiency is also deteriorated. Due to the high temperature work, a large amount of the rust preventive component was vaporized, resulting in a decrease in rust preventive properties.

In the present invention, in order to control the mechanical tension during coating, the unwinder (Un-winder) and the re-winder (Re-winder) of the mechanical drive speed of the unwinder (Un-winder) using a PIV continuously variable transmission The winder part and the re-winder part are controlled at a ratio of 1.05: 1.00 to minimize the tension before and after coating.

The unwinder part is an axis for unwinding the roll wound around the nonwoven fabric 1a, and the rewinder part is an axis for winding the coated and dried packaging material. Although the unwinder and rewinder parts are not shown in FIG. 2, it can be understood that they are located at the first and the last positions of the nonwoven fabric 1a.

Therefore, it is possible to work by minimizing the occurrence of tension in the non-woven fabric before and after coating. Since the tension can be adjusted by adjusting the driving speed of the motor, the phenomenon in which the width of the product is reduced can be prevented, and the phenomenon in which the coated nonwoven fabric 1a is dried due to no tension of the nonwoven fabric 1a can be prevented.

After coating the vaporizing rust preventive agent, when the temperature of the drying chamber 4 is 90 ° C. or lower, the rust preventive agent is not dried in the nonwoven fibrous pores, and at 100 ° C. or higher, the rust preventive agent is deteriorated due to the large amount of the rust preventive agent. Curl phenomenon occurs. The temperature of the drying chamber 4 is ideally in the range of 90 to 100 ° C., and is a temperature at which the rust preventive property can be maintained by preventing volatilization of the vaporizing rust preventive agent at a high temperature and deformation of the nonwoven fabric 1a does not occur.

The second step is a step of pressing the dried nonwoven fabric 1a with the heating roll 5.

After coating the rust preventive agent as shown in FIG. 2, the nonwoven fabric 1a passed through the drying chamber 4 is set to a temperature in the range of 90 to 100 ° C., and is preceded by a pair of heating rolls 5 having a diameter of 400 to 600 mm. It is in contact with both the back and the back. Therefore, the rust preventive agent penetrated between the nonwoven fabric 1a fibrous pores is secondaryly dried at a temperature of 90 to 100 ° C., and the non-woven fabric 1a is pressed by the heating roll 5 to completely dry the rust preventive agent, and mixed with the rust preventive agent. By fixing the existing binder to the nonwoven fabric 1a, the problem that the rust preventive agent precipitates on the surface of the nonwoven fabric 1a can be solved.

The third step is a high temperature thermal bonding of the nonwoven fabric 1b coated with a vaporizable rust preventive agent and the hemp fabric 2 made of a polypropylene material to the polypropylene resin 3 by a T-die method.

Polypropylene can process products at lower temperatures than polyethylene or polyester, so there is less deformation of synthetic resin products during the second processing, less loss due to heat of vaporizing rust preventive agent, and satisfactory packing ability of wrapping paper.

As shown in Fig. 3, the nonwoven fabric 1b coated with a vaporizable rust preventive agent and a hemp cloth 2 made of a polypropylene material are extruded by high temperature heat bonding to a polypropylene resin 3 by a T-die method. That is, this step is heat-bonded with a polypropylene resin to produce a vaporizable rust-proof packaging material. The carpenter of the said dress material 2 may be any, but it is preferable to use 10x10 or 8x8.

The hemp fabric 2 serves as a reinforcement used to increase the mechanical strength, which is called the carpenter by the number of threads used per inch. In other words, if the number of yarns within 10 inches is 10 horizontally and vertically, it is called 10 × 10 neck.

If the thickness of the yarn constituting the hemp fabric (2) is the same, the more the number of carpenters of the thread, the higher the mechanical strength but the higher the price side.

The important thing when heat-bonding the nonwoven fabric (1b) and the hemp fabric (2) with polypropylene resin (3) is the working temperature. Usually, the work is carried out at 280 ~ 330 ° C. And less heat deformation of the nonwoven fabric (1b) and hemp fabric (2) can minimize the curling phenomenon. In addition, since the vaporizable rust preventive agent is present in the nonwoven fabric 1b fiber, it is possible to prevent the work environment and workability from being deteriorated due to severe gas and odor caused by the oxidation of the rust preventive agent during thermal bonding.

An embodiment according to the present invention is as follows.

Example 1

1,2-15-benzotriazole 5-15 weight%, salicylic acid + morpholine 10-30 weight%, octanoic acid + tributylamine 10-30 weight%, sodium benzoate 5-15 weight%, sodium nitrite 5 A rust preventive agent is mix | blended with -15 weight%, 1-10 weight% of polyvinyl alcohol, and 40-70 weight% of water + methanol, and the hemp cloth 2 uses 8x8.

Example 2

5-15% by weight of tolytriazole, 10-30% by weight of benzoic acid + monoethanolamine, 10-30% by weight of hexanoic acid + diethylamine, 5-15% by weight of ammonium benzoate, 5-15 of sodium nitrite A rust preventive agent is mix | blended by the weight%, 1-10 weight% of gum arabic, and 40-70 weight% of water + methanol, and the hemp cloth 2 uses 10x10.

By combining the anti-corrosive agent in the above Example and coating the nonwoven fabric (1a) to complete the packaging material and tested by the test method specified in KS A 2112, the results shown in Table 1 below.

TABLE 1

division Background Example 1 Example 2 Vaporization 1 hours Rust occurrence No rust No rust 20 hours Rust occurrence No rust No rust Vaporization anti-corrosion after exposure 48 hours of exposure 1 hours Rust occurrence No rust No rust 120 hours of exposure 1 hours Rust occurrence No rust No rust Contact rust resistance 4 Cycle Rust occurrence No rust No rust

The foldability and curlability of the packaging were tested, and the prerequisites for packaging were met.

The foldability of the wrapping paper should not be restored until a certain time (about 1 minute) has elapsed after folding the wrapping paper.

In addition, the curling of the wrapping paper is judged whether both ends are curled when the wrapping paper is unfolded, and there is no standardized test.

In the present invention, after cutting the three sheets of 30cm each in the horizontal and vertical portions of the left and right sides and the edge portion of the wrapping paper and measured the change over time, the results as shown in Table 2 below were obtained.

There was almost no curling compared to the rusted paper, and there was no curling in the carpenter's differences in the hemp fabrics.

TABLE 2

division Immediately after collection 1 hour later 24 hours later 48 hours later Example 1 1 mm 2 mm 3 mm 2 mm Example 2 1 mm 2 mm 2 mm 3 mm OPP rustproof paper 8 mm 8 mm 40mm 2 turns 40mm 2 turns

The figures in the table are the heights of the edges of the wrapping paper at the bottom. The smaller the value measured, the more there is no wrapping of the wrapping paper.

1 is a cross-sectional view of the packaging material of the present invention

Figure 2 is a manufacturing process diagram of fixing the rust preventive material to a nonwoven fabric

Figure 3 is a process diagram for bonding the nonwoven fabric and hemp fabric with a polypropylene resin

[Description of Drawings]

1a, 1b: nonwoven fabric 2: hemp fabric

3: polypropylene resin 4: drying chamber

5: heating roll

Claims (6)

The polypropylene nonwoven fabric 1b, the polypropylene hemp fabric 2, and the nonwoven fabric 1b and the hemp fabric 2 which are impregnated with the rust preventive agent are filled to fill the nonwoven fabric 1b and the hemp fabric 2, respectively. An anti-corrosive packaging material using a nonwoven fabric and hemp fabric made of polypropylene, characterized in that it comprises a polypropylene resin (3) to be bonded. The antirust agent according to claim 1, wherein the antirust agent is 5 to 15 wt% of triazoles, 5 to 30 wt% of organic acid amine salts, 5 to 30 wt% of fatty acid amine salts, 5 to 15 wt% of alkaline earth metals, and 1 to 10 wt% binder. %, Water or 45 to 75% by weight of alcohol, anti-corrosive packaging material using a non-woven fabric and hemp fabric made of polypropylene. A first step of coating the rust preventive agent on a nonwoven fabric (1a) made of polypropylene and drying to bind the rust preventive agent to the nonwoven fabric (1a); And a third step of injecting a high temperature polypropylene resin (3) between the nonwoven fabric (1b) coated with a vaporizing antirust agent and a hemp fabric (2) made of polypropylene material and performing high temperature heat bonding in a T-die manner. Method for producing a rust-proof packaging material using a non-woven fabric and hemp fabric made of a polypropylene material, characterized in that the configuration. The antirust agent according to claim 3, wherein the rust preventive agent is 5 to 15% by weight of triazoles, 5 to 30% by weight of organic acid amine salts, 5 to 30% by weight of fatty acid amine salts, 5 to 15% by weight of alkaline earth metals, and 1 to 10% by weight binder. %, Water or 45 to 75% by weight of alcohol, characterized in that the production method of the rust-proof packaging material using a non-woven fabric and hemp fabric made of a polypropylene material. 4. The method of claim 3, wherein the drying temperature of the first step is 90 to 100 ° C. 4. The method of claim 3, wherein the high temperature thermal bonding of the third step is performed at 280 to 330 ° C.

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