Vapor-phase corrosion inhibitor for steel, vapor-phase corrosion-inhibiting packaging material and preparation method thereof

Abstract

The present application discloses a vapor-phase corrosion inhibitor for steel, a vapor-phase corrosion inhibitor packaging material for steel and a preparation method thereof. The components of the vapor-phase corrosion inhibitor for steel include, by mass percentage: 5.0% - 7.0% of sodium phytate, 8% - 10% of sodium glutamate, 0.2% - 0.4% of cyclohexylamine methylurea, 8% - 10% of ammonium phosphate, 0.2% - 0.4% of a first component, 0.7% - 1.8% of a second component, and the balance being water; wherein, the first component is selected from at least one of phytic acid and glutamic acid; the second component includes menthol and limonene. The corrosion inhibition efficiency of the vapor-phase corrosion inhibitor for steel in the present application can reach 90% and above, and the corrosion inhibition efficiency is relatively high; when applied to cold-rolled steel sheets such as automotive sheets, tin plates and chromium-plated plates, it can not only effectively prevent the steel sheets from being corroded, but also keep the surface tension of the steel sheets ≥ 32 mN / m, so that the steel sheets can have good coating performance and cleanliness, and the components are safe.

Description

Technical Field

[0001] This application belongs to the field of vapor-phase rust preventive materials, and specifically relates to a vapor-phase corrosion inhibitor for steel, a vapor-phase corrosion-inhibiting packaging material for steel, and a preparation method of a vapor-phase corrosion inhibitor packaging material for steel. Background Art

[0002] Cold-rolled steel sheets produced by steel mills, such as automotive sheets, tinplate, and chrome-plated sheets, usually need to be printed and coated before being sent to downstream manufacturers for actual production. Therefore, the steel sheets are required to have excellent coating properties.

[0003] However, cold-rolled steel sheets such as automotive sheets, tinplate, and chrome-plated sheets are prone to corrosion during transportation and storage, which affects the performance of the steel sheets. In related technologies, vapor-phase corrosion-inhibiting materials are usually used for packaging treatment before transportation and storage. The vapor-phase corrosion inhibitor on the vapor-phase corrosion-inhibiting materials is volatile and can be released in the relatively enclosed space formed by the packaging. It is adsorbed on the surface of the steel sheet physically or chemically to form a protective film to prevent the steel sheet from being corroded. However, after packaging with the existing vapor-phase corrosion-inhibiting packaging materials and transporting them to downstream manufacturers, the coating properties are often not good. Summary of the Invention

[0004] To solve at least one of the above technical problems, an object of this application is to provide a vapor-phase corrosion inhibitor for steel, a vapor-phase corrosion-inhibiting packaging material for steel, and a preparation method of a vapor-phase corrosion inhibitor packaging material for steel.

[0005] To achieve one of the above application objects, an embodiment of this application provides a vapor-phase corrosion inhibitor for steel, the components of which include, by mass percentage: 5.0% - 7.0% of sodium phytate, 8% - 10% of sodium glutamate, 0.2% - 0.4% of cyclohexylamine methylurea, 8% - 10% of ammonium phosphate, 0.2% - 0.4% of the first component, and 0.7% - 1.8% of the second component, and the rest is water;

[0006] Wherein, the first component is selected from at least one of phytic acid and glutamic acid;

[0007] The second component includes menthol and limonene.

[0008] As a further improvement of an embodiment, the first component includes phytic acid and glutamic acid, and 0.2% - 0.4% of the first component specifically includes: 0.1% - 0.2% of phytic acid and 0.1% - 0.2% of glutamic acid.

[0009] As a further improvement of an embodiment, the second component further includes geraniol and eucalyptol.

[0010] As a further improvement of an embodiment, the 0.7% - 1.8% of the second component specifically includes: 0.1% - 0.2% of menthol, 0.1% - 0.3% of limonene, 0.2% - 0.5% of geranium oil, and 0.3% - 0.8% of eucalyptol.

[0011] To achieve the above application purpose, an embodiment of the present application further provides a gas-phase corrosion inhibitor packaging material for steel, including a substrate and a gas-phase corrosion inhibitor coating applied on the surface of the substrate; the gas-phase corrosion inhibitor coating is coated with the gas-phase corrosion inhibitor for steel as described above.

[0012] As a further improvement of an embodiment, the substrate is made of kraft paper, fiberboard or non-woven fabric.

[0013] As a further improvement of an embodiment, the unit area mass of the substrate is 80 - 120 g / m 2 , the tensile strength ≥ 7 kN / m, the pH value is 6.8 - 7.2, and the water content is 4 - 6%.

[0014] As a further improvement of an embodiment, the gas-phase corrosion inhibitor packaging material for steel further includes a film, and the coating and the film are respectively located on opposite surfaces of the substrate.

[0015] As a further improvement of an embodiment, the film is a polytetrafluoroethylene film.

[0016] As a further improvement of an embodiment, the water content of the gas-phase corrosion inhibitor packaging material for steel is 0 - 3%, the moisture permeability is 0 - 5 g / (m 2 ·24h), the contact corrosion grade is 0, the gas-phase corrosion inhibition grade is 0, and the corrosion inhibition efficiency is 90% - 100%;

[0017] When the packaging material is used for steel plates, the surface tension of the steel plates can be maintained ≥ 32 mN / m.

[0018] To achieve the above application purpose, an embodiment of the present application further provides a preparation method of a gas-phase corrosion inhibitor packaging material for steel, including:

[0019] Step S1. Substrate pretreatment

[0020] The surface of the substrate is purged with hot air at a constant temperature, and the temperature of the hot air is 40 - 45 °C;

[0021] Step S2. Coating

[0022] The gas-phase corrosion inhibitor for steel as described above is coated on one surface of the substrate to form a coating.

[0023] As a further improvement of an embodiment, the preparation method further includes:

[0024] Step S3. Film laminating

[0025] Adhere the film to the surface of the substrate on the side away from the coating.

[0026] As a further improvement of an embodiment, the step S3 specifically includes: bonding a polytetrafluoroethylene film to the substrate using an epoxy acrylate photocuring adhesive, and then curing with ultraviolet light.

[0027] As a further improvement of an embodiment, in the step S3, before film laminating, blow-dry the surface of the substrate on the side away from the coating with hot air, control the temperature of the hot air to be 40 - 45°C, the distance from the hot air outlet to the substrate ≤ 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located to be 40° - 50°.

[0028] As a further improvement of an embodiment, in the step S1, control the distance from the hot air outlet to the substrate ≤ 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located to be 40° - 50°.

[0029] As a further improvement of an embodiment, in the step S2, control the temperature of the steel vapor phase inhibitor to be 50 - 60°C, and continuously stir before coating.

[0030] As a further improvement of an embodiment, in the step S2, the coating is carried out at 20 - 25°C, the coating amount of the vapor phase inhibitor is 15 - 20 g / m 2 , and the coating speed along the length direction of the substrate is 15 - 20 m / s;

[0031] After coating, dry the coating with hot air, control the ambient temperature to be 40 - 45°C, the temperature of the hot air to be 40 - 45°C, control the distance from the hot air outlet to the substrate ≤ 1 m, the angle between the air outlet direction and the plane where the substrate is located to be 85° - 95°, and the air volume of the hot air to be 10 - 20 m 3 / min.

[0032] Compared with the prior art, the steel vapor phase inhibitor, the steel vapor phase inhibitor packaging material, and the preparation method of the steel vapor phase inhibitor packaging material of the present application have the following beneficial effects:

[0033] The corrosion inhibition efficiency can reach 90% and above, with a relatively high corrosion inhibition efficiency; when applied to cold-rolled steel sheets that require surface coating such as automotive sheets, tin plates, and chromium-plated plates, it can not only effectively prevent the steel sheets from being corroded, but also keep the surface tension of the steel sheets ≥ 32 mN / m, so that the steel sheets have good coating performance and cleanliness, and the components are safe and environmentally friendly. Specific embodiments

[0034] The technical solution of the present application will be further introduced below in conjunction with specific implementation manners, but the scope of protection required is not limited only to the description made.

[0035] An embodiment of the present application provides a vapor phase corrosion inhibitor for steel, and its components include, by mass percentage: 5.0% - 7.0% of sodium phytate, 8% - 10% of sodium glutamate, 0.2% - 0.4% of cyclohexylamine methylurea, 8% - 10% of ammonium phosphate, 0.2% - 0.4% of the first component, and 0.7% - 1.8% of the second component, with the rest being water;

[0036] Among them, the first component is selected from at least one of phytic acid and glutamic acid;

[0037] The second component includes menthol and limonene.

[0038] Among them, sodium phytate, as a chelating agent, can chelate with metals, and adsorbing to the steel plate surface can improve the corrosion resistance of the steel plate, and can also increase the surface tension of the steel plate, thereby enhancing the corrosion resistance of the steel plate and increasing the surface tension of the steel plate. And sodium phytate is weakly alkaline and can cooperate with sodium glutamate and phytic acid and glutamic acid in the first component to adjust the pH value of the vapor phase corrosion inhibitor so that the pH value of the vapor phase corrosion inhibitor is roughly in the neutral range, and the cost is low.

[0039] Sodium glutamate can enhance the antioxidant ability and corrosion resistance, further increase the surface tension of the steel plate. Sodium glutamate is also weakly alkaline and can cooperate with sodium phytate and phytic acid and glutamic acid in the first component to adjust the pH value of the vapor phase corrosion inhibitor so that the pH value of the vapor phase corrosion inhibitor is roughly in the neutral range. Through the synergistic effect of sodium phytate and sodium glutamate, the corrosion inhibition efficiency of the vapor phase corrosion inhibitor can be greatly improved.

[0040] Cyclohexylamine methylurea and ammonium phosphate can form physical and chemical protective films on the steel plate surface to isolate corrosive pollutants, and the protective film is a monolayer and can form a relatively complete film layer on the steel plate surface, so as to better isolate the corrosion medium.

[0041] Phytic acid, as a chelating agent, can chelate with metals, and adsorbing to the steel plate surface can improve the corrosion resistance of the steel plate, and can also increase the surface tension of the steel plate, thereby enhancing the corrosion resistance of the steel plate and increasing the surface tension of the steel plate. And phytic acid is weakly acidic and can cooperate with sodium phytate and sodium glutamate to adjust the pH value of the vapor phase corrosion inhibitor so that the pH value of the vapor phase corrosion inhibitor is roughly in the neutral range.

[0042] Glutamic acid can also enhance the antioxidant ability and corrosion resistance, further increase the surface tension of the steel plate, and is weakly acidic and can cooperate with sodium phytate and sodium glutamate to adjust the pH value of the vapor phase corrosion inhibitor so that the pH value of the vapor phase corrosion inhibitor is roughly in the neutral range.

[0043] As volatile agents, menthol and limonene can enhance the volatility of the vapor-phase corrosion inhibitor, and also have a certain ability to improve the corrosion resistance, without affecting the surface tension of the steel plate, and can also improve the odor of the rust-proof paper.

[0044] After testing, the corrosion inhibition efficiency of the vapor-phase corrosion inhibitor for this steel can reach 90% or more, with a relatively high corrosion inhibition efficiency. When applied to cold-rolled steel plates that require surface coating such as automotive sheets, tinplate, and chromium-plated sheets, it can not only effectively prevent the steel plate from being corroded, but also maintain the surface tension of the steel plate ≥ 32 mN / m, so that the steel plate has good coating performance and cleanliness. Moreover, the components of this vapor-phase corrosion inhibitor are safe and environmentally friendly.

[0045] Preferably, the first component includes phytic acid and glutamic acid, and 0.2% - 0.4% of the first component specifically includes: 0.1% - 0.2% of phytic acid and 0.1% - 0.2% of glutamic acid. Through the synergistic effect of phytic acid and glutamic acid, the corrosion inhibition efficiency of the vapor-phase corrosion inhibitor can be greatly improved.

[0046] That is to say, the components of the vapor-phase corrosion inhibitor for steel, by mass percentage, preferably include: 5.0% - 7.0% of sodium phytate, 8% - 10% of sodium glutamate, 0.2% - 0.4% of cyclohexylamine methylurea, 8% - 10% of ammonium phosphate, 0.1% - 0.2% of phytic acid, 0.1% - 0.2% of glutamic acid, and 0.7% - 1.8% of the second component, with the rest being water.

[0047] Preferably, the second component also includes geraniol and eucalyptol, which can not only improve the odor of the vapor-phase corrosion inhibitor, but also have a certain antioxidant property and volatility.

[0048] Preferably, 0.7% - 1.8% of the second component specifically includes: 0.1% - 0.2% of menthol, 0.1% - 0.3% of limonene, 0.2% - 0.5% of geraniol, and 0.3% - 0.8% of eucalyptol.

[0049] That is to say, the components of the vapor-phase corrosion inhibitor for steel, by mass percentage, preferably include: 5.0% - 7.0% of sodium phytate, 8% - 10% of sodium glutamate, 0.2% - 0.4% of cyclohexylamine methylurea, 8% - 10% of ammonium phosphate, 0.2% - 0.4% of the first component, 0.1% - 0.2% of menthol, 0.1% - 0.3% of limonene, 0.2% - 0.5% of geraniol, 0.3% - 0.8% of eucalyptol, with the rest being water.

[0050] An embodiment of the present application also provides a vapor-phase corrosion inhibitor packaging material for steel, which includes a base material and a vapor-phase corrosion inhibitor coating applied to the surface of the base material; the vapor-phase corrosion inhibitor coating is coated with the vapor-phase corrosion inhibitor for steel as described above. Among them, the water content of the vapor-phase corrosion inhibitor packaging material is 0-3%.

[0051] After testing, the corrosion inhibition efficiency of the vapor-phase corrosion inhibitor packaging material for steel can reach 90% and above, with a relatively high corrosion inhibition efficiency; when applied to cold-rolled steel plates such as automotive sheets, tin plates, and chromium-plated plates, it can not only effectively prevent the steel plates from being corroded, but also maintain the surface tension of the steel plates at ≥32 mN / m after sealing and packaging the steel plates for more than 5 days, so that the steel plates can have good coating performance and cleanliness. Moreover, the components of this vapor-phase corrosion inhibitor are safe and environmentally friendly.

[0052] Among them, the base material can be kraft paper, fiberboard or non-woven fabric. By using special papers such as kraft paper, fiberboard or non-woven fabric, on the one hand, it can ensure that the base material has certain strength, wear resistance and stability, so that when packaging the steel plate, a relatively closed space can be formed inside the packaging material to facilitate the volatilization of the vapor-phase corrosion inhibitor and maintain a certain concentration; on the other hand, it can make the base material have good processability and coatability to facilitate the coating of the vapor-phase corrosion inhibitor.

[0053] Preferably, the base material is kraft paper to facilitate cost control.

[0054] Preferably, the unit area mass of the base material is 80-120 g / m 2 , the tensile strength ≥7 kN / m, the pH value is 6.8-7.2, and the water content is 0-3%. Thus, it can ensure that the base material has certain strength, wear resistance and stability, so that when packaging the steel plate, a relatively closed space can be formed inside the packaging material, and the durability of the packaging material can be improved; the pH value of the base material is controlled between 6.8 and 7.2, which helps to maintain the chemical stability of the packaging material and reduce corrosion caused by pH fluctuations.

[0055] The tensile strength ≥7 kN / m of the base material means that on the plane where the base material is located, the tensile strength in any direction is ≥7 kN / m.

[0056] The vapor-phase corrosion inhibitor packaging material for steel also includes a film, and the coating and the film are respectively located on opposite surfaces of the base material, that is to say, the film is provided on one surface of the base material facing away from the coating. By setting the film, it can not only prevent the packaging material from being scratched or cut, but also increase the sealing performance of the packaging material to facilitate the formation of a relatively closed space inside the packaging material after packaging.

[0057] The film is preferably a polytetrafluoroethylene film, which not only has a good bonding effect with the substrate, but also is corrosion-resistant, scratch-resistant, safe and environmentally friendly.

[0058] After testing, the moisture permeability of the vapor phase corrosion inhibitor packaging material is 0-5 g / (m 2 ·24h), the contact corrosion grade is 0, the vapor phase corrosion inhibition grade is 0, and the corrosion inhibition efficiency is 90%-100%, that is, it can effectively prevent the steel plate from being corroded; and when the packaging material is used for the steel plate, the surface tension of the steel plate can be maintained ≥32 mN / m, so that the steel plate has good coating performance and cleanliness.

[0059] An embodiment of the present application also provides a preparation method of the aforementioned vapor phase corrosion inhibitor packaging material for steel, that is, the aforementioned vapor phase corrosion inhibitor packaging material for steel is prepared by this preparation method.

[0060] The preparation method includes the steps:

[0061] S1. Substrate pretreatment

[0062] Use hot air to blow and sweep the surface of the substrate at a constant temperature, and the temperature of the hot air is 40-45 °C;

[0063] S2. Coating

[0064] Coat the aforementioned vapor phase corrosion inhibitor for steel on one side surface of the substrate to form a coating.

[0065] In the above preparation method, by blowing and sweeping the surface of the substrate with hot air at a constant temperature, the surface of the substrate can be cleaned, the cleanliness and temperature of the substrate surface can be improved, and preparations can be made for coating the vapor phase corrosion inhibitor; by coating the aforementioned vapor phase corrosion inhibitor on one side surface of the substrate, the corrosion inhibition efficiency of the prepared packaging material can reach 90% and above, and the corrosion inhibition efficiency is relatively high; when applied to cold-rolled steel plates such as automotive sheets, tin plates and chromium-plated plates, it can not only effectively prevent the steel plate from being corroded, but also maintain the surface tension of the steel plate at ≥32 mN / m after sealing and packaging the steel plate for more than 5 days, so that the steel plate can have good coating performance and cleanliness, and is environmentally friendly.

[0066] In the step S1, the substrate can be kraft paper, fiberboard or non-woven fabric. By using this special paper such as kraft paper, fiberboard or non-woven fabric, on the one hand, it can ensure that the substrate has certain strength, wear resistance and stability, so that when packaging the steel plate, a relatively closed space can be formed in the packaging material to facilitate the volatilization of the vapor phase corrosion inhibitor and maintain a certain concentration; on the other hand, it can make the substrate have good processability and coatability, which is conducive to the coating of the vapor phase corrosion inhibitor.

[0067] Preferably, the substrate is kraft paper to facilitate cost control.

[0068] Preferably, the basis weight of the base material is 80-120 g / m 2 , the tensile strength ≥ 7 kN / m, the pH value is 6.8-7.2, and the moisture content is 4-6%. Thereby, it can ensure that the base material has certain strength, wear resistance and stability, so that when packaging the steel plate, a relatively airtight space can be formed within the packaging material, and the durability of the packaging material can be improved; the pH value of the base material is controlled at 6.8-7.2, which helps to maintain the chemical stability of the packaging material and reduce corrosion caused by pH fluctuations.

[0069] The tensile strength ≥ 7 kN / m of the base material means that on the plane where the base material is located, the tensile strength in any direction is ≥ 7 kN / m.

[0070] Preferably, in the step S1, the distance from the hot air outlet to the base material is controlled ≤ 0.8 m, and the angle between the air outlet direction and the plane where the base material is located is 40°-50°. In this way, the cleaning effect and cleaning efficiency of the base material surface can be improved, and the temperature of the base material surface can quickly reach the required temperature, improving the preparation efficiency.

[0071] In the step S2, the temperature of the steel vapor phase inhibitor is controlled at 50-60 °C, and continuous stirring is carried out before coating to make the composition distribution of the vapor phase inhibitor uniform. Controlling the temperature of the vapor phase inhibitor at 50-60 °C can, on the one hand, improve the uniformity of the composition distribution of the vapor phase inhibitor, and on the other hand, improve the wetting ability of the vapor phase inhibitor coating, thereby improving the diffusion efficiency of the vapor phase inhibitor and its coverage rate and coating uniformity on the base material.

[0072] In the step S2, the coating is carried out at 20-25 °C, the coating amount of the vapor phase inhibitor is 15-20 g / m 2 , and the coating speed along the length direction of the base material is 15-20 m / s. By controlling the ambient temperature during coating at 20-25 °C, problems such as uneven coating and shrinkage holes caused by too large a temperature difference between the ambient temperature and the temperature of the vapor phase inhibitor can be avoided; by controlling the coating speed and coating amount, the vapor phase inhibitor can be evenly coated and the coating amount can be ensured.

[0073] In the step S2, after coating, hot air is used to dry the coating until the surface of the coating is dry. The ambient temperature is controlled at 40-45 °C, the temperature of the hot air is 40-45 °C, the distance from the hot air outlet to the base material is controlled ≤ 1 m, the angle between the air outlet direction and the plane where the base material is located is 85°-95°, and the air volume of the hot air is 10-20 m 3 / min. In this way, only the moisture in the vapor phase inhibitor can be volatilized to accelerate drying.

[0074] Among them, the surface drying, also known as dry to touch, refers to the stage where the wet coating film has reached the surface drying state, and the coating film changes from a flowable liquid state to a relatively non-flowable state with the surface starting to form a film; at this time, the coating film no longer adheres to small and light particles.

[0075] After drying, the water content of the gas-phase corrosion inhibitor packaging material is 0 - 3%.

[0076] Furthermore, the preparation method further includes the steps:

[0077] S3. Film coating

[0078] Adhere the film to the surface of the substrate on the side facing away from the coating.

[0079] Through film coating, the coating and the film are respectively located on two opposite surfaces of the substrate. The film can not only prevent the packaging material from being scratched or cut, but also increase the sealing performance of the packaging material, so as to facilitate the formation of a relatively airtight space inside the packaging material after packaging.

[0080] The film is preferably a polytetrafluoroethylene film, which not only has a good bonding effect with the substrate, but also is corrosion-resistant, scratch-resistant, safe and environmentally friendly.

[0081] The specific steps of S3 include: using an epoxy acrylate photocuring adhesive to bond the polytetrafluoroethylene film to the substrate, and then using ultraviolet light for curing. Using ultraviolet light curing technology for film coating can improve the bonding strength between the film and the substrate, thereby providing better protection to the substrate and improving the durability of the packaging material.

[0082] Among them, the wavelength of the ultraviolet light is 360 - 380 nm, the intensity of the ultraviolet light is 200 - 500 mW / cm 2 , the exposure time is 1.5 - 3 s, the curing temperature is 20 - 25 °C, and the curing distance is 3 - 5 cm.

[0083] In step S3, before film coating, blow-dry the surface of the substrate on the side facing away from the coating with hot air, control the temperature of the hot air to be 40 - 45 °C, the distance from the hot air outlet to the substrate ≤ 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located is 40° - 50°. By blowing and drying the surface of the substrate with hot air, the surface of the substrate can be cleaned, and the cleanliness and temperature of the substrate surface can be improved, which is beneficial to better film coating.

[0084] Furthermore, the preparation method further includes the steps:

[0085] S4. Rolling into a roll

[0086] Pack the film-coated packaging material into a cylindrical roll for easy storage and transportation.

[0087] To make the objectives, technical solutions, and advantages of this application clearer, the following will further illustrate this embodiment in combination with Examples 1 to 2 according to an embodiment of this application. Obviously, the described Examples 1 to 2 are part of the embodiments of this application, rather than all of them. Other embodiments based on the foregoing embodiment do not depart from the technical purpose of this application.

[0088] Example 1

[0089] This example provides a vapor-phase corrosion inhibitor, a packaging material prepared using the vapor-phase corrosion inhibitor, and a preparation method of the packaging material.

[0090] The components of the vapor-phase corrosion inhibitor include, by mass percentage: sodium phytate 7.0%, sodium glutamate 10%, cyclohexylamine methylurea 0.4%, ammonium phosphate 10%, phytic acid 0.2%, glutamic acid 0.2%, menthol 0.1%, limonene 0.1%, geranium oil 0.2%, eucalyptol 0.3%, and the balance is water.

[0091] The preparation method of the packaging material includes the steps:

[0092] S1. Substrate pretreatment

[0093] The surface of the substrate is purged with hot air at a constant temperature. The temperature of the hot air is 45°C, the distance from the hot air outlet to the substrate is controlled to be 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located is 45°.

[0094] Among them, the substrate uses kraft paper, and the unit area mass of the kraft paper is 100 g / m 2 , the tensile strength ≥ 7 kN / m, the pH value is 7.0, and the water content is 4.5%.

[0095] S2. Coating

[0096] The vapor-phase corrosion inhibitor is coated on one side surface of the kraft paper to form a coating.

[0097] Among them, the temperature of the vapor-phase corrosion inhibitor is controlled to be 50°C, and continuous stirring is carried out before coating. The coating is carried out at 25°C. The coating amount of the vapor-phase corrosion inhibitor is 20 g / m 2 , and the coating speed along the length direction of the substrate is 15 m / s.

[0098] After coating, hot air is used to dry the coating until the surface of the coating is dry. Among them, the ambient temperature and the temperature of the hot air during drying are controlled to be 40°C. The distance from the hot air outlet to the kraft paper is controlled to be 1 m, the angle between the air outlet direction and the plane where the kraft paper is located is 90°, and the air volume of the hot air is 20 m 3 / min. After drying, the water content of the vapor-phase corrosion inhibitor packaging material is measured to be 2.5%.

[0099] S3. Film laminating

[0100] Blow hot air on one surface of the kraft paper away from the coating, control the temperature of the hot air to be 45°C, the distance from the hot air outlet to the kraft paper to be 0.8 m, and the angle between the air outlet direction and the plane where the kraft paper is located to be 45°.

[0101] After that, use an epoxy acrylate photocuring adhesive to stick the polytetrafluoroethylene film on one surface of the kraft paper away from the coating, and use ultraviolet light curing. The wavelength of the ultraviolet light is 365 nm, and the ultraviolet light intensity is 300 mW / cm 2 , the exposure time is 3 s, the curing temperature is 25°C, and the curing distance is 3 cm.

[0102] S4. Coiling

[0103] Pack the coated packaging material into a cylindrical roll. The width of the cylindrical roll is 2.4 m, and the diameter of the roll core is 0.2 m.

[0104] Conduct performance tests on the obtained vapor-phase corrosion-inhibiting packaging material, specifically including:

[0105] (1) Moisture permeability test

[0106] Conduct the test according to GB / T 1037-2021, and the measured moisture permeability of the vapor-phase corrosion-inhibiting packaging material is 3 g / (mm 2 ·24 h).

[0107] (2) Contact corrosion test

[0108] Conduct the test according to GB / T16266-2019, and the measured contact corrosion grade of the vapor-phase corrosion-inhibiting packaging material is 0.

[0109] (3) Vapor-phase rust prevention test

[0110] Conduct the test according to GB / T 16267-2008, and the measured vapor-phase corrosion-inhibiting grade of the vapor-phase corrosion-inhibiting packaging material is 0, and the corrosion-inhibiting efficiency is 96%.

[0111] The above performances all meet the standard requirements.

[0112] (4) Contact surface tension test

[0113] The tinplate is packaged with this vapor-phase corrosion inhibitor packaging material, and the surface tension of the tinplate after 5 days of packaging is tested. Referring to ASTM D7541-11(2022), the test is carried out by the dyne pen test method. The specific test method is as follows: Use dyne pens of different models to draw lines uniformly along the vertical direction of the rolling texture. If the handwriting does not shrink within 2.5 s, it indicates that the surface tension of the tinplate meets the dyne value of the dyne pen. The surface tension of the tinplate is characterized by the highest dyne value that the tinplate can meet. The surface tension of the tinplate after 5 days of packaging is measured to be 33 mN / m, and the coating performance is good during tinplate printing and coating.

[0114] Example 2

[0115] This example also provides a vapor-phase corrosion inhibitor, a packaging material prepared by using this vapor-phase corrosion inhibitor, and a preparation method of this packaging material.

[0116] The components of this vapor-phase corrosion inhibitor include, by mass percentage: 5.0% of sodium phytate, 8% of sodium glutamate, 0.2% of cyclohexylamine methylurea, 10% of ammonium phosphate, 0.1% of phytic acid, 0.2% of glutamic acid, 0.2% of menthol, 0.3% of limonene, 0.5% of geranium oil, 0.8% of eucalyptol, and the rest is water.

[0117] The preparation method of the packaging material includes the steps:

[0118] S1. Substrate pretreatment

[0119] The surface of the substrate is purged with hot air at a constant temperature. The temperature of the hot air is 40 °C, the distance from the hot air outlet to the substrate is controlled to be 0.5 m, and the angle between the air outlet direction and the plane where the substrate is located is 45°.

[0120] Among them, the substrate uses kraft paper, and the unit area mass of the kraft paper is 80 g / m 2 , the tensile strength ≥ 7 kN / m, the pH value is 6.8, and the water content is 5.5%.

[0121] S2. Coating

[0122] The vapor-phase corrosion inhibitor is coated on one side surface of the kraft paper to form a coating.

[0123] Among them, the temperature of the vapor-phase corrosion inhibitor is controlled to be 55 °C, and continuous stirring is carried out before coating. The coating is carried out at 25 °C. The coating amount of the vapor-phase corrosion inhibitor is 15 g / m 2 , and the coating speed along the length direction of the substrate is 20 m / s.

[0124] After coating, hot air is used to dry the coating until the surface of the coating is dry. Among them, the ambient temperature and the temperature of the hot air are controlled to be 40 °C during drying. The distance from the hot air outlet to the kraft paper is controlled to be 0.5 m, the angle between the air outlet direction and the plane where the kraft paper is located is 90°, and the air volume of the hot air is 10 m3 / min. The water content of the vapor-phase corrosion inhibitor packaging material measured after drying is 2%.

[0125] S3. Film Coating

[0126] Hot air is blown on the surface of the kraft paper on the side away from the coating. The temperature of the hot air is controlled at 40 °C, the distance from the hot air outlet to the kraft paper is 0.5 m, and the angle between the air outlet direction and the plane where the kraft paper is located is 45°.

[0127] After that, a polytetrafluoroethylene film is adhered to the surface of the kraft paper on the side away from the coating using an epoxy acrylate photocuring adhesive, and ultraviolet light curing is carried out. The wavelength of the ultraviolet light is 370 nm, and the ultraviolet light intensity is 450 mW / cm 2 , the exposure time is 2 s, the curing temperature is 25 °C, and the curing distance is 3 cm.

[0128] S4. Rolling into a Roll

[0129] The coated packaging material is packed into a cylindrical roll. The width of the cylindrical roll is 2 m, and the diameter of the roll core is 0.15 m.

[0130] Performance testing is carried out on the obtained vapor-phase corrosion inhibitor packaging material, specifically including:

[0131] (1) Moisture Permeability Performance Testing

[0132] Testing is carried out according to GB / T 1037-2021, and the moisture permeability of the vapor-phase corrosion inhibitor packaging material is measured to be 2 g / (mm 2 ·24 h).

[0133] (2) Contact Corrosion Inspection

[0134] Testing is carried out according to GB / T16266-2019, and the contact corrosion grade of the vapor-phase corrosion inhibitor packaging material is measured to be 0.

[0135] (3) Vapor Phase Rust Prevention Inspection

[0136] Testing is carried out according to GB / T 16267-2008, and the vapor-phase corrosion inhibition grade of the vapor-phase corrosion inhibitor packaging material is measured to be 0, and the corrosion inhibition efficiency is 91%.

[0137] The above performances all meet the standard requirements.

[0138] (4) Contact Surface Tension Inspection

[0139] The chromed plate is packaged with this vapor-phase corrosion inhibitor packaging material, and the surface tension of the chromed plate after 5 days of packaging is tested. Referring to ASTM D7541-11(2022), the test is carried out by the dyne pen test method. The specific test method is as follows: Use dyne pens of different models to make uniform scribing along the vertical direction of the rolling texture. If the scribed line does not shrink within 2.5 s, it indicates that the surface tension of the chromed plate meets the dyne value of the dyne pen. The surface tension of the chromed plate is characterized by the highest dyne value that the chromed plate can meet. The surface tension of the chromed plate after 5 days of packaging is measured to be 34 mN / m, and it has good coating performance during tinplate coating.

[0140] It should be understood that although this specification is described according to the embodiments, not every embodiment only contains an independent technical solution. This narrative way of the specification is only for clarity. Those skilled in the art should regard the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

[0141] The detailed descriptions listed above are only specific descriptions of the feasible embodiments of this application, and they are not intended to limit the protection scope of this application. Any equivalent embodiments or changes made without departing from the technical spirit of this application should be included in the protection scope of this application.

Claims

1. A vapor-phase corrosion inhibitor for steel, characterized in that, Its components by mass percentage include: sodium phytate 5.0% - 7.0%, sodium glutamate 8% - 10%, cyclohexylamine methylurea 0.2% - 0.4%, ammonium phosphate 8% - 10%, the first component 0.2% - 0.4%, the second component 0.7% - 1.8%, and the balance is water; Wherein, the first component is selected from at least one of phytic acid and glutamic acid; The second component includes menthol and limonene; The corrosion inhibition efficiency of the steel gas-phase corrosion inhibitor reaches 90% or more, and the surface tension of the steel plate after coating the steel gas-phase corrosion inhibitor is maintained at ≥ 32 mN / m.

2. The vapor-phase corrosion inhibitor for steel as claimed in claim 1, wherein The first component includes phytic acid and glutamic acid, and 0.2% - 0.4% of the first component specifically includes: phytic acid 0.1% - 0.2% and glutamic acid 0.1% - 0.2%.

3. The vapor phase corrosion inhibitor for steel according to claim 1, characterized in that, The second component further includes geraniol and eucalyptol.

4. The vapor phase corrosion inhibitor for steel according to claim 3, wherein 0.7% - 1.8% of the second component specifically includes: menthol 0.1% - 0.2%, limonene 0.1% - 0.3%, geraniol 0.2% - 0.5%, and eucalyptol 0.3% - 0.8%.

5. A gas-phase corrosion inhibitor packaging material for steel, characterized in that, It includes a substrate and a gas-phase corrosion inhibitor coating applied on the surface of the substrate; the gas-phase corrosion inhibitor coating is coated with the steel gas-phase corrosion inhibitor according to any one of claims 1 to 4.

6. The gas-phase corrosion inhibitor packaging material for steel as claimed in claim 5, wherein The substrate is made of kraft paper, fiberboard or non-woven fabric.

7. The gas-phase corrosion inhibitor packaging material for steel according to claim 5, characterized in that, The basis weight of the base material is 80~120 g / m 2 , the tensile strength ≥ 7 kN / m, the pH value is 6.8~7.2, and the water content is 4~6%.

8. The gas-phase corrosion inhibitor packaging material for steel as claimed in claim 5, wherein It further includes a film, and the coating and the film are respectively located on the opposite two surfaces of the substrate.

9. The gas-phase corrosion inhibitor packaging material for steel as claimed in claim 8, wherein The film is a polytetrafluoroethylene film.

10. The gas-phase corrosion inhibitor packaging material for steel according to claim 5, characterized in that, Its water content is 0~3%, moisture permeability is 0~5 g / (m 2 ·24 h), contact corrosion grade is 0, vapor phase corrosion inhibition grade is 0, and corrosion inhibition efficiency is 90%~100%; When the packaging material is used for steel plates, the surface tension of the steel plates is maintained at ≥ 32 mN / m.

11. A preparation method of a vapor-phase corrosion inhibitor packaging material for steel, characterized in that, It includes: Step S1. Substrate pretreatment The surface of the substrate is purged with hot air at a constant temperature, and the temperature of the hot air is 40 - 45 °C; Step S2. Coating The steel gas-phase corrosion inhibitor according to any one of claims 1 to 4 is coated on one side surface of the substrate to form a coating.

12. The preparation method according to claim 11, wherein, The preparation method further includes: Step S3. Film laminating The film is adhered to the surface of the substrate on the side opposite to the coating.

13. The preparation method according to claim 12, characterized in that, The step S3 specifically includes: using an epoxy acrylate photocuring adhesive to bond the polytetrafluoroethylene film to the substrate, and then curing with ultraviolet light.

14. The preparation method according to claim 12, characterized in that, In the step S3, before film laminating, the surface of the substrate on the side opposite to the coating is purged with hot air, controlling the temperature of the hot air to be 40 - 45 °C, the distance from the hot air outlet to the substrate is ≤ 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located is 40° - 50°.

15. The preparation method according to claim 11, characterized in that, In the step S1, the distance from the hot air outlet to the substrate is controlled to be ≤ 0.8 m, and the angle between the air outlet direction and the plane where the substrate is located is 40° - 50°.

16. The preparation method according to claim 11, wherein In the step S2, the temperature of the steel gas-phase corrosion inhibitor is controlled to be 50 - 60 °C, and continuous stirring is carried out before coating.

17. The preparation method according to claim 11, wherein In the step S2, the coating is carried out at 20~25°C, and the coating amount of the vapor-phase corrosion inhibitor is 15~20 g / m 2 , and the coating speed along the length direction of the substrate is 15~20 m / s; After coating, hot air is used to dry the coating. The ambient temperature is controlled at 40~45°C, the temperature of the hot air is 40~45°C, the distance from the hot air outlet to the substrate is controlled to be ≤1 m, the angle between the air outlet direction and the plane where the substrate is located is 85°~95°, and the air volume of the hot air is 10~20 m 3 / min.