Matt oil for heat-resistant and pressure-resistant black aluminum-plastic film and preparation method thereof

Abstract

The present application relates to the field of ink technology, and specifically discloses a matte oil for heat-resistant and pressure-resistant black aluminum-plastic film and a preparation method thereof. A matte oil for heat-resistant and pressure-resistant black aluminum-plastic film, comprising the matte oil comprising the following raw materials in parts by weight: 80-100 parts of a polyurethane prepolymer, 10-20 parts of hydrophilic silica, 1-5 parts of a dispersant, 0.5-2 parts of maleic anhydride grafted polyethylene wax, 0.5-2 parts of a coupling agent, 0.5-1 parts of a chain extender, and 0.1-0.2 parts of a catalyst. The matte oil for heat-resistant and pressure-resistant black aluminum-plastic film of the present application, through the synergistic synergy between the chain extender and the coupling agent, enhances the strength and melting point of the polyurethane structure, thereby improving the heat resistance and pressure resistance of the matte layer. The dispersibility of the matte oil system is improved by hydrophilic silica and maleic anhydride grafted polyethylene wax, the heat resistance of the matte layer is enhanced, and the deformation and shedding of the matte layer are further reduced.

Description

Technical Field

[0001] The present application relates to the technical field of inks, and more specifically, to a matte oil for heat-resistant and pressure-resistant black aluminum-plastic film and a preparation method thereof. Background Art

[0002] The aluminum-plastic films currently used on the market are mainly silver and black. The black film is thinner than the silver film. The outermost layer of the black film is coated with a matte ink to give it a better appearance. At the same time, the matte layer should be wear-resistant, not easy to fall off, not deform, and resistant to temperature and pressure.

[0003] Commonly used reaction-curing matte inks are primarily made from a combination of polyurethane resin, silica, and other additives. However, during packaging, due to high-temperature and high-pressure processing conditions, the matte layer is prone to deformation, losing the matte effect and affecting the product appearance. Summary of the Invention

[0004] In order to improve the problem that matte ink is easily deformed during processing, the present application provides a matte oil for temperature-resistant and pressure-resistant black aluminum-plastic film and a preparation method thereof.

[0005] In the first aspect, the present application provides a matte oil for heat-resistant and pressure-resistant black aluminum-plastic film, which adopts the following technical solution: a matte oil for heat-resistant and pressure-resistant black aluminum-plastic film, the matte oil comprising the following raw materials in parts by weight: 80-100 parts of polyurethane, 10-20 parts of hydrophilic silica, 1-5 parts of dispersant, 0.5-2 parts of maleic anhydride grafted polyethylene wax, 0.5-2 parts of coupling agent, 0.5-1 parts of chain extender, and 0.1-0.2 parts of catalyst.

[0006] By adopting the above technical solution, the chain extender and coupling agent synergistically enhance the degree of crosslinking between the polyurethane molecular chain and the branched chain, thereby increasing the polyurethane molecular chain strength and polyurethane melting point, thereby improving the matte oil's resistance to high temperature and high pressure, thereby alleviating the problem of the matte layer's easy deformation during processing. Hydrophilic silica and maleic anhydride-grafted polyethylene wax are added to the polyurethane system as matting ingredients. The hydrophilic silica can be evenly dispersed in the matte oil system, improving the matte oil's heat resistance. At the same time, the hydrophilic property can reduce the sedimentation of silica, improving the leveling and thermal stability of the matte layer. Maleic anhydride-grafted polyethylene wax can improve the compatibility of silica and polyurethane, and can migrate to the surface of the matte layer during the film-forming process, enhancing the matte layer's matte effect, and promoting the matte layer to have certain anti-adhesion properties, thereby improving the matte layer's wear resistance and adhesion.

[0007] Preferably, the hydrophilic silica particle size is 2-5 μm.

[0008] By adopting the above technical solution, the hydrophilic silica particle size is controlled within a suitable range, which can promote better compatibility between silica and polyurethane and reduce the agglomeration phenomenon between silica particles.

[0009] Preferably, the dispersant is methyl pentanol.

[0010] By adopting the above technical solution, methyl pentanol can promote the uniform dispersion of silicon dioxide in the matte oil system, so that the matte layer has a uniform matte effect.

[0011] Preferably, the chain extender is diethylene glycol.

[0012] By adopting the above technical solution, diethylene glycol can extend the molecular chain length of the polyurethane prepolymer and increase the melting point of the polyurethane structure, thereby improving the thermal stability of the matte layer and reducing the deformation phenomenon during the processing of the matte layer.

[0013] Preferably, the matte oil raw material further includes 0.3-0.5 parts of cellulose acetate butyrate.

[0014] By adopting the above technical solution, cellulose acetate butyrate has a certain film-forming effect in the matte oil system, which can protect the matte components mainly composed of silica and polyethylene wax, reduce the loss of matte components on the surface of the matte layer, and thus improve the matte durability of the matte layer.

[0015] Preferably, the matte oil raw material further comprises 0.1-0.3 parts of glycidyl methacrylate, 0.05-0.15 parts of methyl methacrylate and 0.03-0.05 parts of initiator.

[0016] By adopting the above technical solution, by grafting cellulose acetate butyrate with methyl methacrylate and glycidyl methacrylate, the flatness of the matte layer can be improved. At the same time, the use of glycidyl methacrylate can enhance the adhesion between the matte layer and the substrate, promoting the matte layer to be firmly bonded to the aluminum-plastic film, thereby improving the stability of the matte layer.

[0017] In a second aspect, the present application provides a method for preparing a matte oil for a heat-resistant and pressure-resistant black aluminum-plastic film, which adopts the following technical solution:

[0018] A method for preparing a heat-resistant and pressure-resistant matte oil for a black aluminum-plastic film comprises the following specific steps: mixing a polyurethane adhesive, a coupling agent, a chain extender and a catalyst, heating the mixture in a vacuum for reaction, cooling the mixture, adding hydrophilic silicon dioxide, a dispersant and maleic anhydride-modified polypropylene wax for mixing and dispersing the mixture, vacuum degassing and grinding the mixture to obtain the heat-resistant and pressure-resistant matte oil for the black aluminum-plastic film.

[0019] Preferably, the heating reaction temperature is 110-120°C.

[0020] By adopting the above technical solution, the prepared matte oil has good high temperature and pressure resistance. At the same time, the thermal stability of the matte layer is improved by hydrophilic silica and maleic anhydride grafted polyethylene wax, thereby reducing the deformation of the matte layer.

[0021] In summary, this application has the following beneficial effects:

[0022] 1. This application utilizes chain extenders and coupling agents to extend the polyurethane molecular chain, raising the polyurethane melting point and thereby improving the matte layer's resistance to high temperatures and high pressures, reducing deformation. Hydrophilic silica and maleic anhydride-grafted polyethylene wax are added to the matte oil system to enhance the matte layer's thermal stability and promote the uniform dispersion of matte components within the matte oil system, resulting in a uniform matte finish.

[0023] 2. In this application, cellulose acetate butyrate is preferably used to produce a film-forming effect in the matte oil system, thereby forming a film to protect the matte components in the matte oil system, reducing the loss of matte components on the surface of the matte layer, and thus improving the matte durability of the matte layer. DETAILED DESCRIPTION

[0024] The present application is further described in detail below with reference to the embodiments.

[0025] The molecular weight of the maleic anhydride grafted polyethylene wax is 4000, the viscosity is 220 cps, and the average particle size is 5 μm.

[0026] The polyurethane prepolymer was purchased from Jiangsu Qianmeite Polyurethane New Materials Co., Ltd. as polyester polyurethane prepolymer T80.

[0027] The hydrophilic silica selected was HL-200 silica, with a specific surface area of ​​200 m2 / g.

[0028] Example

[0029] Example 1

[0030] This embodiment provides a matte finish for heat-resistant and pressure-resistant black aluminum-plastic film, comprising the following raw materials in parts by weight: 90 kg of polyurethane prepolymer, 15 kg of hydrophilic silica, 3 kg of dispersant, 1.2 kg of maleic anhydride-grafted polyethylene wax, 1.3 kg of coupling agent, 0.8 kg of chain extender, and 0.15 kg of catalyst. The dispersant is methyl pentanol, the chain extender is diethylene glycol, the hydrophilic silica has an average particle size of 3 μm, the catalyst is dibutyltin dilaurate, and the coupling agent is silane coupling agent KH550.

[0031] The preparation method of the matte oil for heat-resistant and pressure-resistant black aluminum-plastic film comprises the following specific steps:

[0032] The polyurethane prepolymer, coupling agent, chain extender and catalyst are mixed, the vacuum degree is maintained at ≤-0.095 MPa, and the mixture is heated at 120°C for 1 hour to form a matte oil mixture;

[0033] When it is detected that the moisture content in the matte oil mixture is ≤0.05%, the matte oil mixture is cooled to 60°C, nitrogen is added to normal pressure, hydrophilic silica, dispersant, and maleic anhydride grafted polyethylene wax are added to the matte oil mixture, and the mixture is stirred at a speed of 2000 r / min for 10 minutes. The mixture is evacuated to maintain a vacuum degree of ≤-0.095 MPa, and deaerated for 30 minutes to form a matte oil semi-finished product. Finally, the matte oil semi-finished product is ground for 200 minutes to obtain a heat-resistant and pressure-resistant matte oil for black aluminum-plastic film.

[0034] Example 2

[0035] The difference between Example 2 and Example 1 is that the usage of the polyurethane prepolymer in the matte oil raw material for heat-resistant and pressure-resistant black aluminum-plastic film is 80 kg, the usage of hydrophilic silica is 20 kg, the usage of the dispersant is 1 kg, the usage of maleic anhydride grafted polyethylene wax is 0.5 kg, the usage of the coupling agent is 2 kg, the usage of the chain extender is 0.5 kg, and the usage of the catalyst is 0.1 kg.

[0036] Example 3

[0037] The difference between Example 3 and Example 1 is that the amount of the polyurethane prepolymer in the raw material of the matte oil for heat-resistant and pressure-resistant black aluminum-plastic film is 100 kg, the amount of hydrophilic silica is 10 kg, the amount of the dispersant is 5 kg, the amount of maleic anhydride grafted polyethylene wax is 2 kg, the amount of the coupling agent is 0.5 kg, the amount of the chain extender is 1 kg, and the amount of the catalyst is 0.2 kg.

[0038] Example 4

[0039] The difference between Example 4 and Example 1 is that the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film further includes 0.4 kg of cellulose acetate butyrate.

[0040] The preparation method of the matte oil for heat-resistant and pressure-resistant black aluminum-plastic film comprises the following specific steps:

[0041] The polyurethane prepolymer, coupling agent, chain extender and catalyst are mixed, the vacuum degree is maintained at ≤-0.095 MPa, and the mixture is heated at 120°C for 1 hour to form a matte oil mixture;

[0042] When it is detected that the moisture content in the matte oil mixture is ≤0.05% by mass, the matte oil mixture is cooled to 60°C, nitrogen is added to normal pressure, hydrophilic silica, dispersant, maleic anhydride grafted polyethylene wax and cellulose acetate butyrate are added to the matte oil mixture, the mixture is stirred at a speed of 2000 r / min for 10 minutes, vacuum is applied to maintain a vacuum degree of ≤-0.095 MPa, and degassing is performed for 30 minutes to form a matte oil semi-finished product. Finally, the matte oil semi-finished product is ground for 200 minutes to obtain a heat-resistant and pressure-resistant matte oil for black aluminum-plastic film.

[0043] Example 5

[0044] The difference between Example 5 and Example 4 is that the amount of cellulose acetate butyrate used in the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film is 0.3 kg.

[0045] Example 6

[0046] The difference between Example 6 and Example 4 is that the amount of cellulose acetate butyrate used in the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film is 0.5 kg.

[0047] Example 7

[0048] The difference between Example 7 and Example 4 is that the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film further includes 0.2 kg of glycidyl methacrylate, 0.1 kg of methyl methacrylate, and 0.04 kg of an initiator, wherein the initiator is benzoyl peroxide.

[0049] The preparation method of the matte oil for heat-resistant and pressure-resistant black aluminum-plastic film comprises the following specific steps:

[0050] S1: Cellulose acetate butyrate and ethyl acetate are mixed in advance, with the mass ratio of ethyl acetate to cellulose acetate butyrate being 2:1, and stirred evenly to form a cellulose acetate butyrate solution. Then, glycidyl methacrylate, methyl methacrylate and an initiator are added to the cellulose acetate butyrate solution, and the mixture is reacted at a constant temperature of 90°C for 3 hours to form a cellulose acetate butyrate-acrylic acid complex.

[0051] S2: Mix the polyurethane prepolymer, coupling agent, chain extender and catalyst, maintain the vacuum degree ≤-0.095MPa, and react at 120°C for 1 hour to form a matte oil mixture.

[0052] S3: When it is detected that the moisture content in the matte oil mixture is ≤0.05%, the matte oil mixture is cooled to 60°C, nitrogen is added to normal pressure, hydrophilic silica, dispersant, maleic anhydride grafted polyethylene wax and cellulose acetate butyrate-acrylic acid composite are added to the matte oil mixture, and the mixture is stirred at a speed of 2000r / min for 10min, vacuumed to maintain a vacuum degree of ≤-0.095MPa, and degassed for 30min to form a matte oil semi-finished product. Finally, the matte oil semi-finished product is ground for 200min to obtain a heat-resistant and pressure-resistant matte oil for black aluminum-plastic film.

[0053] Example 8

[0054] The difference between Example 8 and Example 7 is that the usage of the matte oil raw material for the heat-resistant and pressure-resistant black aluminum-plastic film is 0.1 kg of glycidyl methacrylate, 0.05 kg of methyl methacrylate, and 0.03 kg of initiator.

[0055] Example 9

[0056] The difference between Example 9 and Example 7 is that the usage of the matte oil raw material for the heat-resistant and pressure-resistant black aluminum-plastic film is 0.3 kg of glycidyl methacrylate, 0.15 kg of methyl methacrylate, and 0.05 kg of initiator.

[0057] Example 10

[0058] The difference between Example 10 and Example 7 is that glycidyl methacrylate in the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film is replaced by an equal amount of methyl methacrylate.

[0059] Comparative Example

[0060] Comparative Example 1

[0061] The difference between Comparative Example 1 and Example 1 is that the hydrophilic silica in the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film is replaced by hydrophobic silica, the average particle size of the hydrophobic silica is 3 μm, and the hydrophobic silica is Degussa R202.

[0062] Comparative Example 2

[0063] The difference between Comparative Example 2 and Example 1 is that the maleic anhydride grafted polyethylene wax in the matte oil raw material for the heat-resistant and pressure-resistant black aluminum-plastic film is replaced by an equal amount of polyethylene wax, and the molecular weight of the polyethylene wax is 3500.

[0064] Comparative Example 3

[0065] The difference between Comparative Example 3 and Example 1 is that no chain extender and coupling agent are used in the raw material of the matte oil for the heat-resistant and pressure-resistant black aluminum-plastic film.

[0066] Performance testing

[0067] The following performance tests were conducted on the heat-resistant and pressure-resistant black aluminum-plastic films provided in Examples 1-10 and Comparative Examples 1-3 of the present application using matte oil. The specific test results are shown in Table 1.

[0068] Detection method

[0069] 1. High temperature resistance

[0070] The matte oil prepared in this application is coated on the surface of the aluminum-plastic film to form a matte layer with a thickness of 3-4 μm. The aluminum-plastic film is then heat-sealed. Under high temperature and high pressure, the aluminum matte layer is observed for deformation and the heat-sealing time is recorded.

[0071] 2. Glossiness

[0072] The matte oil prepared in the present application is coated on the surface of the aluminum-plastic film to form a matte layer with a thickness of 3-4 μm, and the glossiness of the matte layer is tested using a gloss tester.

[0073] 3. Adhesion

[0074] The matte coating prepared herein was applied to the surface of an aluminum-plastic film to form a matte layer with a thickness of 3-4 μm. The film was then tested using a test tape (19 mm width) with a peel strength of (0.44 ± 0.01) N / mm. The tape was adhered tightly to the matte layer without bubbles. The tape was held in place for 50 mm for 30 seconds. The tape was then peeled off at a 45° angle within 1 second. The presence of any detachment of the matte layer was recorded.

[0075] Table 1: Performance test data table

[0076]

[0077] It can be seen from the performance test results that the matte oil prepared in this application has good temperature and pressure resistance. The strength of the polyurethane molecular chain is enhanced by chain extenders and coupling agents, and the melting point of the polyurethane structure is increased, thereby improving the temperature and pressure resistance of the matte oil and reducing the heat-sealing deformation and falling off of the matte layer.

[0078] In Examples 1-3 of the present application, the usage amounts of the various components of the matte oil are different. From the performance test results, it can be seen that the comprehensive performance of Example 1 is better.

[0079] In Examples 4-6, adding an appropriate amount of cellulose acetate butyrate to the matte oil system improved the matte layer's heat and pressure resistance, as shown by performance testing results. The matte layer's surface exhibited a good matte finish. Cellulose acetate butyrate enhanced the adhesion between the matte layer and the aluminum-plastic film, thereby reducing matte layer deformation and improving the matte layer's heat and pressure resistance.

[0080] In Examples 7-9, adding appropriate amounts of methyl methacrylate and glycidyl methacrylate to the matte oil system significantly improved the heat and pressure resistance of the matte layer, as shown by performance testing results. This is because the grafting reaction of methyl methacrylate, glycidyl methacrylate, and cellulose acetate butyrate improves the flatness of the matte layer, thereby strengthening the bond between the matte layer and the aluminum-plastic film, reducing deformation and shedding of the matte layer, and thus improving the stability of the matte layer. In contrast, in Example 10, replacing glycidyl methacrylate with other acrylic monomers actually reduced the overall performance of the matte layer. This is because glycidyl methacrylate forms a chemical bond with the aluminum-plastic film, thereby better promoting the matte oil to adhere firmly to the surface of the aluminum-plastic film and enhancing the adhesion between the matte layer and the aluminum-plastic film.

[0081] Comparing Comparative Examples 1 and 2 with Example 1 reveals that the matte layer's heat and pressure resistance significantly decreased when hydrophobic silica was used in Comparative Example 1 and conventional polyethylene wax was used in Comparative Example 2. This is because the hydrophilic silica is better dispersed in the matte oil system, resulting in a more uniform matte finish and improved heat resistance. Adding maleic anhydride-grafted polyethylene wax to the matte oil system further improves the dispersibility of silica and provides a protective film on the matte layer's surface, enhancing the matte finish and wear resistance.

[0082] Comparing Comparative Example 3 with Example 1 shows that, despite the absence of a chain extender or coupling agent in the matte coating system in Comparative Example 3, the matte layer exhibited deformation and detachment during heat sealing, as shown by performance testing. This further demonstrates that the chain extender and coupling agent synergistically enhance the crosslinking strength between the polyurethane molecular chains and their branches, raising the melting point of the polyurethane structure and thereby improving the matte layer's heat and pressure resistance.

[0083] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make non-creative modifications to the present embodiment as needed, but as long as they are within the scope of the claims of the present application, they are protected by the patent law.

Claims

1. A matte oil for heat-resistant and pressure-resistant black aluminum-plastic film, characterized in that: The matte oil comprises the following raw materials in parts by weight: 80-100 parts of polyurethane prepolymer, 10-20 parts of hydrophilic silica, 1-5 parts of dispersant, 0.5-2 parts of maleic anhydride grafted polyethylene wax, 0.5-2 parts of coupling agent, 0.5-1 parts of chain extender, 0.1-0.2 parts of catalyst, 0.3-0.5 parts of cellulose acetate butyrate, 0.1-0.3 parts of glycidyl methacrylate, 0.05-0.15 parts of methyl methacrylate and 0.03-0.05 parts of initiator; the dispersant is methyl amyl alcohol, and the chain extender is diethylene glycol.

2. The heat-resistant and pressure-resistant matte oil for black aluminum-plastic film according to claim 1, characterized in that: The hydrophilic silica particle size is 2-5 μm.

3. A method for preparing a heat-resistant and pressure-resistant matte oil for black aluminum-plastic film according to any one of claims 1 to 2, characterized in that: The specific steps include: Cellulose acetate butyrate and ethyl acetate are mixed in advance at a mass ratio of ethyl acetate to cellulose acetate butyrate of 2:1, and stirred evenly to form a cellulose acetate butyrate solution. Then, glycidyl methacrylate, methyl methacrylate, and an initiator are added to the cellulose acetate butyrate solution, and the mixture is reacted at a constant temperature of 90°C for 3 hours to form a cellulose acetate butyrate-acrylic acid complex. The polyurethane prepolymer, coupling agent, chain extender and catalyst are mixed, vacuum heated for reaction, and after cooling, hydrophilic silica, dispersant, maleic anhydride modified polypropylene wax and cellulose acetate butyrate-acrylic acid composite are added and mixed and dispersed, vacuum degassed and ground to obtain heat-resistant and pressure-resistant black matte oil for aluminum-plastic film.

4. The method for preparing the heat-resistant and pressure-resistant matte oil for black aluminum-plastic film according to claim 3, wherein: The heating reaction temperature is 110-120°C.

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