An anti-skinning environment-friendly paper-aluminum composite ink packaging can

Abstract

This invention provides an anti-skinning, environmentally friendly paper-aluminum composite ink packaging can, belonging to the field of ink packaging technology. The packaging can includes a can body with an open top, a lid at the top of the can body, and a covering film between the can body and the lid. The covering film is made from the following raw materials in parts by weight: 98-105 parts high-density polyethylene, 7-10 parts low-density polyethylene-polydimethylsiloxane blend matrix, 6-9 parts modified montmorillonite, 0.1-0.3 parts light stabilizer, 0.2-0.3 parts antioxidant, and 1-1.5 parts polyethylene wax. In the low-density polyethylene-polydimethylsiloxane blend matrix, the mass ratio of low-density polyethylene to polydimethylsiloxane is 5:3-5. The modified montmorillonite is obtained by first treating montmorillonite with methylchlorosilane and then with hexadecyltrimethylammonium bromide. This invention reduces the air permeability of the covering film while ensuring excellent tensile strength, thus more effectively preventing ink skinning.

Description

Technical Field

[0001] This invention belongs to the field of ink packaging technology, specifically relating to an anti-skinning environmentally friendly paper-aluminum composite ink packaging can. Background Technology

[0002] During the storage of ink packaging, an oxidation reaction occurs when the ink comes into contact with oxygen in the air. In this process, the solvent in the ink gradually loses its dissolving power, causing solid particles to aggregate and form a hard film. Furthermore, if the seal is poor, the solvent in the ink evaporates too quickly, causing the ink surface to dry rapidly and form a thin skin—the so-called "skinning" phenomenon. Therefore, to reduce skinning, a covering film is needed to seal the opening of the ink packaging can, preventing oxygen from entering and slowing down the oxidation and drying rate of the ink.

[0003] Most existing covering films are made of plastic. In their preparation process, polyethylene is used as the plastic matrix, and layered silicate nanomaterials are dispersed in it. By utilizing their unique barrier properties, they form tortuous paths, which effectively prolong the diffusion path of gas molecules in the film, thereby reducing air permeability and achieving a better effect of isolating oxygen and effectively preventing the formation of skin.

[0004] However, polyethylene itself is a non-polar thermoplastic. When used as a plastic matrix, it has poor compatibility with layered silicates such as montmorillonite and kaolinite, which usually have polar surfaces. This leads to stress concentration and reduces the tensile strength of the plastic film. Summary of the Invention

[0005] To address the problems existing in the background technology, the present invention provides an anti-skinning environmentally friendly paper-aluminum composite ink packaging can, which reduces the air permeability of the covering film while ensuring excellent tensile strength of the covering film, thus ensuring more effective prevention of ink skinning.

[0006] To achieve the above objectives, the present invention provides the following technical solution:

[0007] An anti-skinning environmentally friendly paper-aluminum composite ink packaging can includes a can body with an open top, a lid on the top of the can body, and a covering film between the can body and the lid. The covering film is made of the following raw materials in parts by weight: 98-105 parts of high-density polyethylene, 7-10 parts of low-density polyethylene-polydimethylsiloxane blend matrix, 6-9 parts of modified montmorillonite, 0.1-0.3 parts of light stabilizer, 0.2-0.3 parts of antioxidant, and 1-1.5 parts of polyethylene wax.

[0008] In the raw material components of the low-density polyethylene-polydimethylsiloxane blend matrix, the mass ratio of low-density polyethylene to polydimethylsiloxane is 5:3-5;

[0009] The modified montmorillonite is prepared by first treating montmorillonite with methylchlorosilane, and then treating it with hexadecyltrimethylammonium bromide.

[0010] Furthermore, the preparation method of the low-density polyethylene-polydimethylsiloxane blend matrix is ​​as follows: Add 500 mL of toluene to a 1000 mL flask, then add 300 g of a mixture of low-density polyethylene and polydimethylsiloxane. Heat in a water bath at 80±2 °C and stir until completely dissolved. After cooling, slowly add to anhydrous ethanol while stirring. Flocculent matter immediately precipitates out. Filter to obtain a white solid. Dry under an infrared lamp to obtain the low-density polyethylene-polydimethylsiloxane blend matrix.

[0011] Furthermore, the preparation method of the modified montmorillonite is as follows: Take 30g of silanized montmorillonite, add 13g of hexadecyltrimethylammonium bromide, and stir in 600 mL of 50% ethanol aqueous solution at 75°C for 2 hours. The product is filtered and washed with 50% ethanol aqueous solution until no Br is detected. - The modified montmorillonite was obtained by vacuum drying at 100℃ for 8 hours and then grinding.

[0012] Furthermore, the preparation method of the silanized montmorillonite is as follows: Take 50g of montmorillonite, add 60g of methylchlorosilane, stir and reflux in 500mL of toluene for 36h, filter the product, wash twice with acetone, and wash with 95% ethanol until no Cl is found. - The silanized montmorillonite was obtained by vacuum drying at 100℃ for 8 hours and then grinding.

[0013] Furthermore, the antioxidant includes antioxidant 2246 and / or antioxidant 697.

[0014] Furthermore, the light stabilizer includes UV-326 and light stabilizer 622, and the mass ratio of the two is 1:1.

[0015] Furthermore, the preparation method of the covering film is as follows: high-density polyethylene, light stabilizer, antioxidant and polyethylene wax are added to a mixer and mixed for 15 minutes. Then, low-density polyethylene-polydimethylsiloxane blend matrix and modified montmorillonite are added and stirred for another 10 minutes to obtain a mixture. The mixture is then fed into an extruder for melt extrusion, blown into shape by a die, and the die temperature is raised to 165-205℃. After that, it is drawn, cut and wound to obtain the covering film.

[0016] Furthermore, the extruder has a rotational speed of 80-120 r / min and a melt temperature of 180-195℃.

[0017] Furthermore, the can body includes an inner layer of paper and an outer layer of paper disposed on the outer side wall of the inner layer of paper, and an aluminum film layer is provided on the inner side wall of the inner layer of paper.

[0018] This application has the following beneficial effects:

[0019] 1. The high-density polyethylene used in this invention has excellent tensile strength and gas barrier properties. The addition of low-density polyethylene-polydimethylsiloxane blend matrix can enhance the tensile strength and gas barrier properties of the prepared plastic film. The addition of modified montmorillonite can also enhance the tensile strength and gas barrier properties of the prepared plastic film. Furthermore, experimental verification shows that when low-density polyethylene-polydimethylsiloxane blend matrix and modified montmorillonite are used together to prepare plastic film, there is a synergistic effect in improving the tensile strength and gas barrier properties of the plastic film.

[0020] 2. In the preparation of low-density polyethylene-polydimethylsiloxane blend matrix, the blending of low-density polyethylene and polydimethylsiloxane can complement each other's strengths and weaknesses, resulting in a blend matrix with moderate softness and hardness. Due to the enhanced interaction between the molecular chains of the two, the tensile strength of the resulting plastic film can be improved. Low-density polyethylene itself has good flexibility and transparency, but its gas barrier properties are relatively poor. Polydimethylsiloxane, on the other hand, has low surface energy and good chemical stability. By blending it with low-density polyethylene, it can effectively fill the gaps between low-density polyethylene molecules, thereby reducing the penetration of gas molecules and improving the gas barrier ability of the resulting plastic film.

[0021] 3. In the preparation of modified montmorillonite, after organic modification, montmorillonite, due to its unique layered structure and high cation exchange capacity, can better interact with the polymer matrix. This structure provides more anchoring points for the plastic film, thereby enhancing the tensile strength of the plastic film. Due to its excellent gas barrier properties, when modified montmorillonite is introduced into the plastic film, it can effectively fill the gaps between polymer molecules and form a denser structure. This increases the path length of gas molecules through the plastic film, thereby improving the oxygen barrier capacity of the prepared plastic film. Attached Figure Description

[0022] Figure 1 A perspective view of the anti-skinning environmentally friendly paper-aluminum composite ink packaging can of the present invention;

[0023] Figure 2 1. An exploded view of the anti-skinning environmentally friendly paper-aluminum composite ink packaging can of the present invention (the covering film located between the lid and the can body is not shown).

[0024] Figure 3 A comparison trend chart of tensile strength test data of the covering films prepared in Examples 1-7 and Comparative Examples 1-7 of the present invention;

[0025] Figure 4 A comparative trend chart of oxygen permeability test data of the covering films prepared in Examples 1-7 and Comparative Examples 1-7 of the present invention.

[0026] In the picture: 1. Can body; 11. Outer paper; 12. Inner paper; 2. Lid. Detailed Implementation

[0027] The present application will be further described in detail below with reference to the embodiments.

[0028] Unless otherwise specified, the raw materials used in the embodiments and comparative examples of this application are all commercially available. Example 1

[0029] like Figure 1 and Figure 2 As shown, an anti-skinning environmentally friendly paper-aluminum composite ink packaging can includes a can body 1 with an open top. The can body 1 has a double-layer structure, consisting of an inner paper layer 12 and an outer paper layer 11 located on the outer wall of the inner paper layer. An aluminum film layer is attached to the inner wall of the inner paper layer 12. The top of the inner paper layer 12 is folded outwards to form an outward-flared edge, fitting over the top of the outer paper layer 11. The can body 1 is used to hold ink, and the top of the can body 1 has a lid 2.

[0030] The covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts low-density polyethylene-polydimethylsiloxane blend matrix, 8 parts modified montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant and 1.2 parts polyethylene wax.

[0031] The high-density polyethylene (HDPE) was from Dow Chemical Company, USA, brand name DGDK-3364. The light stabilizers included light stabilizer 622 and ultraviolet absorber UV-326 in a 1:1 mass ratio, both purchased from Shanghai Lingrui Chemical Co., Ltd. The antioxidant was antioxidant 697, purchased from Hubei Guangao Biotechnology Co., Ltd. The polyethylene wax was polyethylene wax H-110, purchased from Hengshui Lianke Rubber & Plastics Trading Co., Ltd.

[0032] The preparation method of low-density polyethylene-polydimethylsiloxane blend matrix is ​​as follows: Add 500 mL of toluene to a 1000 mL flask, then add 300 g of a mixture of low-density polyethylene and polydimethylsiloxane, with a mass ratio of low-density polyethylene to polydimethylsiloxane of 5:4. Heat in a water bath at about 80 °C and stir until completely dissolved. Cool to room temperature and slowly add to 500 mL of anhydrous ethanol while stirring. Flocculent matter immediately precipitates out. Filter to obtain a white solid, and dry under an infrared lamp to obtain the low-density polyethylene-polydimethylsiloxane blend matrix.

[0033] The low-density polyethylene (LDPE) was linear low-density, model DFDA7042, purchased from Qilu Petrochemical Co., Ltd. The polydimethylsiloxane (PDS), with a molecular weight of 550,000, was purchased from Shanghai Resin Factory Co., Ltd.

[0034] The preparation method of modified montmorillonite is as follows: Take 30g of silanized montmorillonite, add 13g of hexadecyltrimethylammonium bromide, and stir in 600 mL of 50% ethanol aqueous solution at 75℃ for 2h. The product is filtered and washed with 50% ethanol aqueous solution until no Br is found. - (The filtrate was treated with 0.1 mol / L AgNO3, and no precipitate was detected.) The mixture was vacuum dried at 100℃ for 8 hours and then ground to obtain modified montmorillonite.

[0035] The preparation method of silanized montmorillonite is as follows: Take 50g of montmorillonite, add 60g of methylchlorosilane, stir and reflux in 500mL of toluene for 36h, filter the product, wash twice with acetone, and wash with 95% ethanol aqueous solution until no Cl is found. - (The filtrate was treated with 0.1 mol / L AgNO3, and no precipitate was detected.) The sample was vacuum dried at 100℃ for 8 hours and then ground to obtain silanized montmorillonite.

[0036] The preparation method of the covering film is as follows: High-density polyethylene, light stabilizer, antioxidant, and polyethylene wax are added to a mixer and mixed for 15 minutes. Then, low-density polyethylene-polydimethylsiloxane blend matrix and modified montmorillonite are added, and stirring is continued for 10 minutes to obtain a mixture. This mixture is then fed into an extruder for melt extrusion at a speed of 100 r / min and a melt temperature of 185°C. The film is blown and shaped using a die, with the die temperature gradually increasing to 185°C. After this process, the film is drawn, cut, and wound to obtain the covering film. According to the size requirements of the anti-skinning environmentally friendly paper-aluminum composite ink packaging can of this invention, the covering film can be adapted for cutting. Example 2

[0037] The only difference between this embodiment and Embodiment 1 is that the amount of raw material components used in the covering film is different.

[0038] Specifically, the covering film is made from the following raw materials in parts by weight: 98 parts high-density polyethylene, 7 parts low-density polyethylene-polydimethylsiloxane blend matrix, 6 parts modified montmorillonite, 0.1 parts light stabilizer, 0.2 parts antioxidant, and 1 part polyethylene wax. Example 3

[0039] The only difference between this embodiment and Embodiment 1 is that the amount of raw material components used in the covering film is different.

[0040] Specifically, the covering film is made from the following raw materials in parts by weight: 105 parts high-density polyethylene, 10 parts low-density polyethylene-polydimethylsiloxane blend matrix, 9 parts modified montmorillonite, 0.3 parts light stabilizer, 0.3 parts antioxidant, and 1.5 parts polyethylene wax. Example 4

[0041] The only difference between this embodiment and Embodiment 1 is that the amount of raw material components used in the covering film is different.

[0042] Specifically, the covering film is made from the following raw materials in parts by weight: 98 parts high-density polyethylene, 10 parts low-density polyethylene-polydimethylsiloxane blend matrix, 9 parts modified montmorillonite, 0.1 parts light stabilizer, 0.2 parts antioxidant, and 1 part polyethylene wax. Example 5

[0043] The only difference between this embodiment and Embodiment 1 is that the amount of raw material components used in the covering film is different.

[0044] Specifically, the covering film is made from the following raw materials in parts by weight: 105 parts high-density polyethylene, 7 parts low-density polyethylene-polydimethylsiloxane blend matrix, 6 parts modified montmorillonite, 0.2 parts light stabilizer, 0.3 parts antioxidant, and 1.5 parts polyethylene wax. Example 6

[0045] The only difference between this embodiment and Example 1 is that in the preparation of the low-density polyethylene-polydimethylsiloxane blend matrix, the mass ratio of low-density polyethylene to polydimethylsiloxane is 5:3. Example 7

[0046] The only difference between this embodiment and Example 1 is that in the preparation of the low-density polyethylene-polydimethylsiloxane blend matrix, the mass ratio of low-density polyethylene to polydimethylsiloxane is 1:1.

[0047] Comparative Example 1

[0048] The only difference between this comparative example and Example 1 is that polydimethylsiloxane is removed, i.e., the low-density polyethylene-polydimethylsiloxane blend matrix is ​​replaced with low-density polyethylene.

[0049] Specifically, the covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts low-density polyethylene, 8 parts modified montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0050] Comparative Example 2

[0051] The only difference between this comparative example and Example 1 is that low-density polyethylene and polydimethylsiloxane are directly mixed and used.

[0052] Specifically, the covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts a mixture of low-density polyethylene and polydimethylsiloxane, 8 parts modified montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0053] In the mixture of low-density polyethylene and polydimethylsiloxane, the mass ratio of low-density polyethylene to polydimethylsiloxane is 5:4.

[0054] Comparative Example 3

[0055] The only difference between this comparative example and Example 1 is that the low-density polyethylene-polydimethylsiloxane blend matrix is ​​removed.

[0056] Specifically, the covering film is made from the following raw materials in parts by weight: 110 parts high-density polyethylene, 8 parts modified montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0057] Comparative Example 4

[0058] The only difference between this comparative example and Example 1 is that the modified montmorillonite is replaced with silanized montmorillonite.

[0059] Specifically, the covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts low-density polyethylene-polydimethylsiloxane blend matrix, 8 parts silanized montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0060] Comparative Example 5

[0061] The only difference between this comparative example and Example 1 is that the modified montmorillonite is replaced with montmorillonite.

[0062] Specifically, the covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts low-density polyethylene-polydimethylsiloxane blend matrix, 8 parts montmorillonite, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0063] Comparative Example 6

[0064] The only difference between this comparative example and Example 1 is the removal of modified montmorillonite.

[0065] Specifically, the covering film is made from the following raw materials in parts by weight: 102 parts high-density polyethylene, 8 parts low-density polyethylene-polydimethylsiloxane blend matrix, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0066] Comparative Example 7

[0067] The only difference between this comparative example and Example 1 is the removal of the low-density polyethylene-polydimethylsiloxane blend matrix and the modified montmorillonite.

[0068] Specifically, the covering film is made from the following raw materials in parts by weight: 110 parts high-density polyethylene, 0.2 parts light stabilizer, 0.25 parts antioxidant, and 1.2 parts polyethylene wax.

[0069] Experimental Example 1

[0070] Test item: Tensile strength;

[0071] Test standard: GB / T 1040.1-2006;

[0072] Test subjects: Covering films prepared in Examples 1-7 and Comparative Examples 1-7;

[0073] Test results: See Table 1.

[0074] Experimental Example 2

[0075] Test item: Oxygen permeability (standard atmospheres).

[0076] Test standard: GB / T 1038-2000;

[0077] Test subjects: Covering films prepared in Examples 1-7 and Comparative Examples 1-7;

[0078] Test results: See Table 1.

[0079] Table 1. Test data for Experiment 1 and Experiment 2

[0080]

[0081] Results Analysis: Analyze Examples 1-7 and combine the data in Table 1 and... Figure 3-4 It can be seen that the tensile strength of the covering film prepared by this invention can reach 28 MPa, and the oxygen permeability is as low as 71.3 cm. 3 ·m -2 • 12h; that is, the tensile strength of the covering film obtained by the present invention is high enough, and its ability to block oxygen is strong enough. When used to cover the mouth of the packaging can containing ink, it can effectively prevent the skin from forming.

[0082] Analysis of Example 1 and Comparative Examples 1-7, combined with data from Table 1 and Figure 3-4 It can be seen that the addition of low-density polyethylene-polydimethylsiloxane blend matrix can enhance the tensile strength and oxygen barrier capacity of the cover film; the addition of modified montmorillonite can also enhance the tensile strength and oxygen barrier capacity of the cover film; and there is a synergistic effect between the two.

[0083] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0084] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A packaging can for anti-skinning environmentally friendly paper-aluminum composite ink, comprising a can body with an open top, wherein the top of the can body is provided with a lid, characterized in that, A covering film is provided between the tank body and the lid. The covering film is made of the following raw materials in parts by weight: 98-105 parts of high-density polyethylene, 7-10 parts of low-density polyethylene-polydimethylsiloxane blend matrix, 6-9 parts of modified montmorillonite, 0.1-0.3 parts of light stabilizer, 0.2-0.3 parts of antioxidant, and 1-1.5 parts of polyethylene wax. In the raw material components of the low-density polyethylene-polydimethylsiloxane blend matrix, the mass ratio of low-density polyethylene to polydimethylsiloxane is 5:3-5; The modified montmorillonite is prepared by first treating montmorillonite with methylchlorosilane and then treating it with hexadecyltrimethylammonium bromide; The preparation method of the low-density polyethylene-polydimethylsiloxane blend matrix is ​​as follows: Add 500 mL of toluene to a 1000 mL flask, then add 300 g of the mixture of low-density polyethylene and polydimethylsiloxane. Heat in a water bath at 80±2℃ and stir until completely dissolved. After cooling, slowly add to anhydrous ethanol while stirring. Flocculent matter immediately precipitates out. Filter to obtain a white solid. Dry under an infrared lamp to obtain the low-density polyethylene-polydimethylsiloxane blend matrix. The modified montmorillonite is prepared as follows: 30g of silanized montmorillonite is added, along with 13g of hexadecyltrimethylammonium bromide. The mixture is stirred at 75°C for 2 hours in 600 mL of a 50% (w / w) ethanol aqueous solution. The product is filtered and washed with a 50% (w / w) ethanol aqueous solution until no Br is detected. - The modified montmorillonite was obtained by vacuum drying at 100℃ for 8 hours and then grinding. The preparation method of the silanized montmorillonite is as follows: Take 50g of montmorillonite, add 60g of methylchlorosilane, stir and reflux in 500mL of toluene for 36h, filter the product, wash twice with acetone, and wash with 95% ethanol until no Cl is found. - The silanized montmorillonite was obtained by vacuum drying at 100℃ for 8 hours and then grinding. The can body includes an inner layer of paper and an outer layer of paper disposed on the outer side wall of the inner layer of paper, and an aluminum film layer is provided on the inner side wall of the inner layer of paper.

2. The anti-skinning environmentally friendly paper-aluminum composite ink packaging can according to claim 1, characterized in that, The antioxidants include antioxidant 2246 and / or antioxidant 697.

3. The anti-skinning environmentally friendly paper-aluminum composite ink packaging can according to claim 1, characterized in that, The light stabilizer includes UV-326 and light stabilizer 622, and the mass ratio of the two is 1:

1.

4. The anti-skinning environmentally friendly paper-aluminum composite ink packaging can according to any one of claims 1-3, characterized in that, The preparation method of the covering film is as follows: high-density polyethylene, light stabilizer, antioxidant and polyethylene wax are added to a mixer and mixed for 15 minutes. Then, low-density polyethylene-polydimethylsiloxane blend matrix and modified montmorillonite are added and stirred for another 10 minutes to obtain a mixture. The mixture is then fed into an extruder for melt extrusion, blown into shape by a die, and the die temperature is raised to 165-205℃. After that, it is pulled, cut and wound to obtain the covering film.

5. The anti-skinning environmentally friendly paper-aluminum composite ink packaging can according to claim 4, characterized in that, The extruder has a rotation speed of 80-120 r / min and a melt temperature of 180-195℃.

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