Environmentally friendly ink for screen printing of untreated PEVA film and preparation method thereof

Abstract

The present invention relates to the field of inks, and in particular, to an environmentally friendly ink for screen printing of untreated PEVA thin films and a preparation method thereof. The raw materials for preparing the environmentally friendly ink for screen printing of untreated PEVA thin films provided by the present invention include, by weight, 20-40 parts of polyurethane resin, 5-10 parts of chlorinated polyolefin, 2-15 parts of aldehyde-ketone resin, 5-20 parts of CAB, 0.5-2 parts of dispersant, 1-2 parts of lubricant, 1-2 parts of anti-wear agent, 0.5-1 parts of defoamer, 1-5 parts of filler, 5-8 parts of pigment, and 70-100 parts of mixed solvent. The environmentally friendly ink prepared by the present invention has good adhesion and high-temperature anti-sticking performance, and is particularly suitable for printing on PEVA soft films.

Description

Technical Field

[0001] The invention relates to the field of ink, in particular to an environmentally friendly ink for screen printing of an untreated PEVA film and a preparation method thereof. Background Art

[0002] PEVA film is an environmentally friendly film material made by blending PE (polyethylene) and EVA (ethylene-vinyl acetate copolymer) in a specific ratio. The material itself is not only completely free of heavy metals, strictly complies with the international toy safety standards EN-71 Part 3 and ASTM-F963, but also does not contain phthalates. It can be safely used in the production of children's toys and effectively avoids the risk of plasticizer release. In terms of production cost, PEVA film is close to PVC materials widely used in the current toy industry, but its environmental protection characteristics make it an ideal substitute for PVC. However, the main component of PEVA film is still PE, so it has similar physical and chemical properties to PE, including low surface polarity, high crystallization, low surface energy, strong three-dimensional regularity and strong natural cohesion. However, these characteristics directly lead to the weak adhesion of environmentally friendly inks when using conventional screen printing environmentally friendly inks, which is difficult to meet production needs. In order to enhance the adhesion of environmentally friendly inks on PEVA films, plasma treatment, surface grinding or primer baking are often used in the industry for pretreatment. However, these methods not only rely on large-scale equipment, but also have certain safety hazards during operation. The process flow is also relatively complicated and may even cause environmental pollution.

[0003] Japanese patent JP2012153793A discloses a screen printing environmentally friendly ink composition, which innovatively proposes to compound cyclized rubber with polyolefin resin adhesive (such as chlorinated polypropylene PP, chlorinated polyethylene PE) to develop an adhesive with excellent adhesion performance. However, the raw materials for preparing the adhesive include aromatic solvents, which do not meet the safety standards of the toy industry. Chinese patent CN102181201B discloses a screen printing environmentally friendly ink for disposable PP materials. The environmentally friendly ink not only has strong adhesion, but also has excellent aging resistance. It is very suitable for printing products such as toys, stationery and gifts. The technical solution mainly achieves good adhesion performance on PP substrates by compounding thermoplastic acrylic resin with chlorinated polyolefins; however, the environmentally friendly ink needs to be baked in an oven at 60°C for 30 minutes after printing, which will increase the time and energy consumption cost of the production process. Another Chinese patent CN107556811A is aimed at PEVA film materials. Through the compounding of polyurethane resin, nitrocellulose resin and other components, an environmentally friendly environmentally friendly ink has been developed. The environmentally friendly ink has excellent adhesion on PEVA film. However, this environmentally friendly ink is specially used for gravure printing, and the ethyl acetate it uses evaporates relatively quickly, making it unsuitable for screen printing technology, which to some extent limits its scope of application.

[0004] Therefore, there is an urgent need for an untreated environmentally friendly ink that can improve the adhesion performance of environmentally friendly ink on the polyolefin surface and has a wide range of applications, which has become a research hotspot in the ink industry. Summary of the invention

[0005] In order to solve the above technical problems, the first aspect of the present invention provides an environmentally friendly ink for screen printing of untreated PEVA film, the preparation raw materials of which include: polyurethane resin, chlorinated polyolefin, aldehyde ketone resin, CAB, dispersant, lubricant, wear agent, defoamer, filler, pigment, and mixed solvent.

[0006] The mixed solvent includes: mixed solvent A, mixed solvent B, mixed solvent C, and mixed solvent D.

[0007] Furthermore, the raw materials for preparing the environmentally friendly ink for screen printing of untreated PEVA film include, by weight: the raw materials for preparing the environmentally friendly ink include, by weight, 20-40 parts of polyurethane resin, 5-10 parts of chlorinated polyolefin, 2-15 parts of aldehyde-ketone resin, 5-20 parts of CAB, 0.5-2 parts of dispersant, 1-2 parts of lubricant, 1-2 parts of wear resistance agent, 0.5-1 part of defoaming agent, 1-5 parts of filler, 5-8 parts of pigment, and 70-100 parts of mixed solvent.

[0008] As an implementable example, the lubricant includes wax powder.

[0009] Furthermore, the wax powder is of brand U-675A, purchased from the United States Trifolium Micron Company.

[0010] Wax powder can form a protective film in environmentally friendly inks, which can effectively prevent printed products from sticking to each other when stacked or in high-temperature environments. It can also significantly improve the wear resistance and scratch resistance of environmentally friendly inks, making printed products less likely to be damaged when rubbed or scratched.

[0011] As an implementable example, the brand of the dispersant is SOLSPERSE 32000, which is purchased from Lubrizol Specialty Chemical Manufacturing Company.

[0012] As an implementable example, the brand of the wear-resistant agent includes ACX-31, which is purchased from Daikin Industries, Ltd. of Japan.

[0013] The wear-resistant agent with the brand name ACX-31 can be used for a long time in a high-temperature environment, and its performance is stable and it is not easy to decompose or deteriorate. At the same time, it has excellent wear resistance and can remain stable for a long time in a high-load and high-speed friction environment, thereby improving the high-temperature anti-adhesion performance of environmentally friendly inks.

[0014] The present invention does not further limit the types of defoamer A and defoamer B. Any substance that can reduce the generation of foam during the preparation process can be used, including but not limited to the defoamer with the brand BYK-A500.

[0015] As an practicable example, the filler includes one or more of aluminum hydroxide, magnesium hydroxide, talc, aluminum oxide, magnesium oxide, silicon oxide, titanium dioxide, calcium silicate, aluminum silicate, calcium carbonate, clay, silicon nitride, silicon carbide, aluminum borate, and synthetic mica.

[0016] Furthermore, the filler is aluminum silicate with a brand name of AS-150, purchased from Guangzhou Tongjiang Chemical Co., Ltd.

[0017] As an implementable example, the pigment includes but is not limited to titanium dioxide, carbon black or powders of other colors.

[0018] Furthermore, the pigment is carbon black with the brand name SPECIAL BLACK 4A, purchased from Shanghai Kaiyin Chemical Co., Ltd.

[0019] The second aspect of the present invention provides a method for preparing an environmentally friendly ink for screen printing of an untreated PEVA film, comprising:

[0020] S1, mixing a polyurethane resin and a mixed solvent A to prepare a polyurethane resin solution;

[0021] S2, mixing the chlorinated polyolefin and the mixed solvent B to prepare a chlorinated polyolefin solution;

[0022] S3, mixing the aldehyde-ketone resin and the mixed solvent C to prepare an aldehyde-ketone resin solution;

[0023] S4, mixing CAB and mixed solvent D to prepare a CAB solution;

[0024] S5. Mix and stir the polyurethane resin solution, the chlorinated polyolefin solution, the aldehyde-ketone resin solution, the CAB solution, the dispersant, the lubricant, the anti-wear agent, the defoaming agent, the filler and the pigment, and grind them to obtain the product.

[0025] Furthermore, the mass ratio of the polyurethane resin to the mixed solvent A is (1-5): (5-10).

[0026] Furthermore, the mass ratio of the polyurethane resin to the mixed solvent A is 3:7.

[0027] Furthermore, the polyurethane resin has a brand name of HP-1091AK, purchased from Zhanyu Materials Technology Co., Ltd.

[0028] As an implementable case, the mixed solvent A includes: one or more of γ-butyrolactone, ethylene glycol butyl ether acetate (BGA), ethyl ethoxypropionate (EEP), ethylene glycol monobutyl ether, propylene glycol methyl ether acetate (PMA), and n-butyl acetate.

[0029] Furthermore, the mixed solvent A comprises: γ-butyrolactone and ethyl ethoxypropionate.

[0030] Furthermore, the mass ratio of γ-butyrolactone to ethyl ethoxypropionate is 42.8:57.2.

[0031] As an implementable example, the method for preparing the polyurethane resin solution comprises: mixing and stirring the polyurethane resin and the mixed solvent A to dissolve them.

[0032] Furthermore, the preparation method of the polyurethane resin solution includes: adding γ-butyrolactone and ethyl ethoxypropionate into a stirring tank, setting the stirring speed to 300-500 r / min, adding the polyurethane resin while stirring, then increasing the speed to 1000-1500 r / min, and dispersing at high speed for 90-120 minutes until dissolved.

[0033] Furthermore, the preparation method of the polyurethane resin solution includes: adding γ-butyrolactone and ethyl ethoxypropionate into a stirring tank, setting the stirring speed to 500 r / min, adding the polyurethane resin while stirring, then increasing the speed to 1200 r / min, and dispersing at high speed for 100 minutes to obtain the solution.

[0034] As an implementable example, the brands of the chlorinated polyolefin include ZG-CPR825 and / or SB-305.

[0035] Furthermore, the mass ratio of the chlorinated polyolefin to the mixed solvent B is (1-3):1.

[0036] Furthermore, the mass ratio of the chlorinated polyolefin to the mixed solvent B is 1:1.

[0037] As an implementable case, the mixed solvent B includes: one or more of γ-butyrolactone, ethylene glycol butyl ether acetate (BGA), ethyl ethoxypropionate (EEP), ethylene glycol monobutyl ether, propylene glycol methyl ether acetate (PMA), and n-butyl acetate.

[0038] Furthermore, the mixed solvent B includes: γ-butyrolactone and ethylene glycol butyl ether acetate.

[0039] Furthermore, the mass ratio of γ-butyrolactone to ethylene glycol butyl ether acetate is (1-3): (1-3).

[0040] Furthermore, the mass ratio of the γ-butyrolactone to ethylene glycol butyl ether acetate is 1:3.

[0041] As an implementable example, the method for preparing the chlorinated polyolefin solution comprises: mixing and stirring the chlorinated polyolefin and the mixed solvent B to dissolve them.

[0042] Furthermore, the preparation method of the chlorinated polyolefin solution comprises: adding γ-butyrolactone and ethylene glycol butyl ether acetate into a stirring tank, setting the stirring speed to 300-500 r / min, adding the chlorinated polyolefin while stirring, then increasing the speed to 800-1200 r / min, dispersing at high speed for 40-60 minutes, and dissolving.

[0043] Furthermore, the preparation method of the chlorinated polyolefin solution includes: adding γ-butyrolactone and ethylene glycol butyl ether acetate into a stirring tank, setting the stirring speed to 500 r / min, adding the chlorinated polyolefin while stirring, then increasing the speed to 1200 r / min, and dispersing at high speed for 60 minutes to obtain the solution.

[0044] As an implementable case, the mass ratio of the aldehyde-ketone resin and the mixed solvent C is (25-45): (45-80).

[0045] Furthermore, the mass ratio of the aldehyde-ketone resin to the mixed solvent C is 40:60.

[0046] As an implementable case, the mixed solvent C includes: one or more of γ-butyrolactone, ethylene glycol butyl ether acetate (BGA), ethyl ethoxypropionate (EEP), ethylene glycol monobutyl ether, propylene glycol methyl ether acetate (PMA), and n-butyl acetate.

[0047] Furthermore, the mixed solvent C includes: ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, and ethoxyethyl propionate.

[0048] Furthermore, the mass ratio of ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, and ethoxyethyl propionate is 1:1:1.

[0049] As an implementable example, the method for preparing the aldehyde-ketone resin solution comprises: mixing and stirring the aldehyde-ketone resin and the mixed solvent C to dissolve them.

[0050] Furthermore, the preparation method of the aldehyde-ketone resin solution includes: adding ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, and ethyl ethoxypropionate into a stirring tank, setting the stirring speed to 300-500 r / min, adding the aldehyde-ketone resin while stirring, then increasing the speed to 800-1200 r / min, and dispersing at high speed for 90-120 minutes to dissolve.

[0051] Furthermore, the preparation method of the aldehyde-ketone resin solution includes: adding ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, and ethyl ethoxypropionate into a stirring tank, setting the stirring speed to 500 r / min, adding the aldehyde-ketone resin while stirring, and then increasing the speed to 1000 r / min, dispersing at high speed for 90 minutes, and dissolving.

[0052] The addition of chlorinated polyolefin can significantly improve the adhesion of environmentally friendly inks; the thickening and curing effects of aldehyde-ketone resins also help to improve the stability of environmentally friendly inks, and at the same time are conducive to the improvement of adhesion; and polyurethane resin has excellent adhesion and bending resistance. When polyurethane resin, chlorinated polyolefin and aldehyde-ketone resin are compounded, environmentally friendly inks have better adhesion fastness on printed materials.

[0053] As an implementable case, the mass ratio of CAB to the mixed solvent D is (10-58):(42-90).

[0054] Furthermore, the mass ratio of CAB to the mixed solvent D is (28-58):(42-72).

[0055] More preferably, the mass fraction of the CAB in the environmentally friendly ink system is 3.6 parts.

[0056] CAB, cellulose acetate butyrate, has good transparency, weather resistance, oil resistance and electrical insulation. In environmentally friendly ink, CAB is mainly used as a film-forming substance and leveling agent, which can give environmentally friendly ink good flexibility, making the printed product not easy to break, and reducing the adhesion phenomenon during the printing process. In addition, CAB can also be used as a dispersion medium for pigments, which helps to evenly disperse the pigments in environmentally friendly inks and improve the printing effect; when CAB and polyurethane resin are compounded in environmentally friendly inks, the two can produce significant synergistic effects, which not only make the environmentally friendly ink have better flexibility, but also give the environmentally friendly ink stronger anti-adhesion. However, it is necessary to further define the mass percentage of CAB in environmentally friendly inks. The inventors found that when the mass fraction of CAB in environmentally friendly inks is 3.6 parts, the anti-adhesion effect of environmentally friendly inks is particularly significant. Even if it is placed at 60°C with a load of 10kg for 8 hours, the environmentally friendly ink can maintain good anti-adhesion performance.

[0057] As an implementable case, the mixed solvent D includes: one or more of γ-butyrolactone, ethylene glycol butyl ether acetate (BGA), ethyl ethoxypropionate (EEP), ethylene glycol monobutyl ether, propylene glycol methyl ether acetate (PMA), and n-butyl acetate.

[0058] Furthermore, the mixed solvent D comprises: propylene glycol methyl ether acetate and n-butyl acetate.

[0059] Furthermore, the mass ratio of propylene glycol methyl ether acetate to n-butyl acetate is (4-8):(3-5).

[0060] Furthermore, the mass ratio of propylene glycol methyl ether acetate to n-butyl acetate is 4:3.

[0061] As an implementable example, the preparation method of the CAB solution includes: mixing CAB and a mixed solvent D and stirring to dissolve them.

[0062] Furthermore, the preparation method of the CAB solution includes: adding propylene glycol methyl ether acetate and n-butyl acetate into a stirring tank, setting the stirring speed to 300-500 r / min, adding CAB while stirring, then increasing the speed to 800-1200 r / min, and dispersing at high speed for 20-30 minutes to dissolve.

[0063] Furthermore, the preparation method of the CAB solution includes: adding propylene glycol methyl ether acetate and n-butyl acetate into a stirring tank, setting the stirring speed to 500 r / min, adding CAB while stirring, then increasing the speed to 900 r / min, and dispersing at high speed for 30 minutes to obtain the CAB solution.

[0064] Furthermore, the specific implementation method of the S5 step includes: adding a polyurethane resin solution, a chlorinated polyolefin solution, an aldehyde-ketone resin solution, and a CAB solution into a stirring tank, setting the stirring speed to 300-500 r / min, adding a dispersant, a lubricant, an anti-wear agent, a defoaming agent, a filler, and a pigment while stirring, and then slowly increasing the speed to 800-1200 r / min, and dispersing at a high speed for 20-40 minutes to obtain a mixed solution E; grinding the dispersed mixed solution E with a three-roll mill until the pigment fineness is ≤20 μm and the viscosity is 40000-50000 mPa.s, and packaging.

[0065] The environmentally friendly ink prepared by the invention can be applied to printing on PEVA soft film, and can be diluted with a mixed solvent of γ-butyrolactone, BGA and n-butyl acetate during use; the mass ratio of γ-butyrolactone, BGA and n-butyl acetate is 5:3:2.

[0066] Beneficial Effects

[0067] (i) The present invention provides an environmentally friendly ink for environmentally friendly screen printing that is suitable for the surface of an untreated PEVA film and can be cured at room temperature. The environmentally friendly ink has good adhesion and high-temperature anti-sticking properties and is particularly suitable for printing on PEVA soft films.

[0068] (ii) The raw materials prepared in the present invention include polyurethane resin and chlorinated polyolefin. The polyurethane modified resin and chlorinated polyolefin are compounded as adhesion promoting resins, which can make the environmentally friendly ink have better flexibility and give the environmentally friendly ink excellent adhesion performance.

[0069] (III) The raw materials for preparation in the present invention also include CAB. The synergistic effect of CAB and polyurethane resin makes the environmentally friendly ink have better flexibility and at the same time gives the environmentally friendly ink excellent high-temperature anti-adhesion property.

[0070] (iv) The raw materials prepared in the present invention do not include toxic benzene solvents, so the environmentally friendly ink has better safety in use.

[0071] (V) The environmentally friendly ink prepared by the present invention can be diluted with a solvent, especially with a solvent compounded with γ-butyrolactone, BGA and n-butyl acetate, which can ensure that the product has a good swelling effect on the substrate. BRIEF DESCRIPTION OF THE DRAWINGS

[0072] Figure 1 Schematic diagram of high temperature anti-adhesion experiment of the product in Example 1.

[0073] Figure 2 Schematic diagram of high temperature anti-adhesion experiment of the product in Example 2.

[0074] Figure 3Schematic diagram of high temperature anti-adhesion experiment of the product in Example 3.

[0075] Figure 4 Schematic diagram of high temperature anti-adhesion experiment of the product in Example 4.

[0076] Figure 5 This is a schematic diagram of the high temperature anti-adhesion experiment of the product of Comparative Example 1.

[0077] Figure 6 Schematic diagram of the swelling performance test results of mixed solvent 1.

[0078] Figure 7 Schematic diagram of the swelling performance test results of mixed solvent 2.

[0079] Figure 8 Schematic diagram of the swelling performance test results of mixed solvent 3.

[0080] Fig. 9 Schematic diagram of the swelling performance test results of mixed solvent 4.

[0081] Fig.10 Schematic diagram of the swelling performance test results of the comparative sample solvent.

[0082] Fig.11 Schematic diagram of high temperature anti-adhesion test of commercially available products. DETAILED DESCRIPTION

[0083] Example 1

[0084] The first aspect of this example provides an environmentally friendly ink for screen printing of an untreated PEVA film, the raw materials for its preparation being, in parts by mass, 21 parts of a polyurethane resin, 11 parts of a chlorinated polyolefin, 4 parts of an aldehyde-ketone resin, 3.6 parts of a CAB, 0.8 parts of a dispersant, 1.2 parts of a lubricant, 1.6 parts of an anti-wear agent, 0.6 parts of a defoaming agent, 2 parts of a filler, 6 parts of a pigment, 49 parts of a mixed solvent A, 11 parts of a mixed solvent B, 6 parts of a mixed solvent C, and 8.4 parts of a mixed solvent D.

[0085] The polyurethane resin is of the brand HP-1091AK, purchased from Zhanyu Materials Technology Co., Ltd.

[0086] The mixed solvent A is: gamma-butyrolactone and ethyl ethoxypropionate; the mass ratio of gamma-butyrolactone to ethyl ethoxypropionate is 42.8:57.2.

[0087] The brand of the chlorinated polyolefin is ZG-CPR825, which is purchased from Shanghai Zeke Chemical Co., Ltd.

[0088] The mixed solvent B is: gamma-butyrolactone and ethylene glycol butyl ether acetate; the mass ratio of gamma-butyrolactone to ethylene glycol butyl ether acetate is 1:3.

[0089] The aldehyde-ketone resin is of R-90, purchased from Yueyang Dongrun Chemical Co., Ltd.

[0090] The mixed solvent C is a compound of ethylene glycol monobutyl ether, propylene glycol methyl ether acetate and ethyl ethoxypropionate; the mass ratio of ethylene glycol monobutyl ether, propylene glycol methyl ether acetate and ethyl ethoxypropionate is 1:1:1.

[0091] The mixed solvent D is propylene glycol methyl ether acetate and n-butyl acetate; the mass ratio of propylene glycol methyl ether acetate to n-butyl acetate is 4:3.

[0092] The lubricant is wax powder with the brand name U-675A, purchased from the United States Sanye Micro Powder Company.

[0093] The grade of the anti-wear agent is ACX-31, which is purchased from Daikin Industries, Ltd. of Japan.

[0094] The defoamer is BYK-A500, purchased from BYK Chemical Technology Consulting (Shanghai) Co., Ltd.

[0095] The filler is aluminum silicate, brand AS-150, purchased from Guangzhou Tongjiang Chemical Co., Ltd.

[0096] The pigment is carbon black with the brand name SPECIAL BLACK 4A, purchased from Shanghai Kaiyin Chemical Co., Ltd.

[0097] The brand of the dispersant is SOLSPERSE 32000, which is purchased from Lubrizol Specialty Chemical Manufacturing Company.

[0098] The second aspect of this example provides a method for preparing an environmentally friendly ink for screen printing of an untreated PEVA film, specifically:

[0099] S1. Preparation of polyurethane resin solution: Add mixed solvent A into a stirring tank, set the stirring speed to 500 r / min, add polyurethane resin while stirring, then increase the speed to 1200 r / min, and disperse at high speed for 100 min until dissolved;

[0100] S2, preparation of chlorinated polyolefin solution: add mixed solvent B into a stirring tank, set the stirring speed to 500r / min, add chlorinated polyolefin while stirring, then increase the speed to 1200r / min, high-speed dispersion for 60min, and dissolve to obtain;

[0101] S3, preparation of aldehyde-ketone resin solution: add mixed solvent C into a stirring tank, set the stirring speed to 500r / min, add aldehyde-ketone resin while stirring, then increase the speed to 1000r / min, and disperse at high speed for 90min until dissolved;

[0102] S4, preparation of CAB solution: add mixed solvent D into a stirring tank, set the stirring speed to 500 r / min, add CAB while stirring, then increase the speed to 900 r / min, and disperse at high speed for 30 minutes until dissolved;

[0103] S5. Preparation of environmentally friendly ink: add polyurethane resin solution, chlorinated polyolefin solution, aldehyde ketone resin solution and CAB solution into a stirring tank, set the stirring speed to 500r / min, add dispersant, lubricant, anti-wear agent, defoamer, filler and pigment while stirring, then increase the speed to 900r / min, disperse at high speed for 40min to obtain a mixed solution E; grind the dispersed mixed solution E with a three-roll mill until the pigment fineness is ≤20μm and the viscosity is 40000-50000mPa.s, and package.

[0104] Example 2

[0105] The specific implementation of this example is the same as that of Example 1, except that the amount of CAB is 1.2 parts and the amount of mixed solvent D is 10.8 parts.

[0106] Example 3

[0107] The specific implementation of this example is the same as that of Example 1, except that the amount of CAB is 2.4 parts and the amount of mixed solvent D is 9.6 parts.

[0108] Example 4

[0109] The specific implementation of this example is the same as that of Example 1, except that the amount of CAB is 4.8 parts and the amount of mixed solvent D is 7.2 parts.

[0110] Comparative Example 1

[0111] The specific implementation of this example is the same as that of Example 1, except that the raw materials for preparing the environmentally friendly ink for screen printing of untreated PEVA film are calculated by weight as follows: 21 parts of polyurethane resin, 11 parts of chlorinated polyolefin, 4 parts of aldehyde-ketone resin, 0.8 parts of dispersant, 1.2 parts of lubricant, 1.6 parts of anti-wear agent, 0.6 parts of defoaming agent, 2 parts of

[0112] Filler, 6 parts pigment, 61 parts mixed solvent A, 11 parts mixed solvent B, 6 parts mixed solvent C.

[0113] Comparative Example 2

[0114] This example provides a commercially available black ink, the ink model is PPVA-501, and the manufacturer is Zhongshan Zhongyi Ink and Paint Co., Ltd.

[0115] Performance Testing

[0116] 1. High temperature anti-adhesion test

[0117] Test object: Environmentally friendly ink for screen printing of untreated PEVA film prepared in Examples 1-4 and Comparative Examples 1-2.

[0118] Test method: Apply environmentally friendly ink on PEVA soft film, then fold and laminate the environmentally friendly ink surface, place in a 60℃ oven, press 10kg for baking, take out after 8 hours, cool at room temperature 25℃ for 15 minutes, and observe the shedding area ratio of the environmentally friendly ink surface. The test results are detailed in Table 1 and Figure 1-5 and Fig.11 .

[0119] Table 1

[0120] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Comparative Example 2 Shedding area ratio (%) <5％ 20％ 10％ 15％ >50％ >50％

[0121] It can be seen from the experimental test results in Table 1 that the environmentally friendly ink prepared by the present invention has excellent high-temperature anti-adhesion performance, among which Example 1 in which the mass ratio of CAB to the mixed solvent D is 3:7 is the optimal implementation scheme.

[0122] 2. Adhesion test

[0123] Test object: Environmentally friendly ink for screen printing of untreated PEVA film prepared in Examples 1-4 and Comparative Example 1.

[0124] Test method: 100-grid test method. Specifically, use a grid knife to draw 100 small squares of 1mm×1mm on the environmentally friendly ink coating to form a 10×10 grid. Make sure that the force is moderate when drawing the grid and do not scratch the substrate. Stick the 3M600SCOTCH standard tape flatly on the gridded environmentally friendly ink surface, and use your thumb to evenly press the tape to ensure that the tape is in full contact with the environmentally friendly ink coating. Pull up the tape quickly at a 90-degree angle, and be careful not to use excessive force to avoid damaging the substrate. Carefully observe the part pulled up by the tape to evaluate the shedding of the environmentally friendly ink. If the environmentally friendly ink coating does not fall off or only a small amount falls off in the grid area (the specified shedding area does not exceed 5% of the total area), the adhesion of the environmentally friendly ink is considered to be qualified. If the environmentally friendly ink coating falls off severely in the grid area and exceeds the specified shedding area, the adhesion of the environmentally friendly ink is considered to be unqualified. The test results are detailed in Table 2.

[0125] Table 2

[0126] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Adhesion performance qualified qualified qualified qualified Failure

[0127] It can be seen from the experimental test results in Table 2 that the environmentally friendly ink prepared by the present invention has excellent adhesion performance. If the raw materials do not include CAB solution, the adhesion performance is significantly reduced.

[0128] 3. Swelling performance test:

[0129] Test object: the untreated PEVA film used in Example 1.

[0130] Test method: Soak the PEVA film in a specific solvent for 5 hours at 25°C, and test the mass difference before and after soaking. The test results are detailed in Table 3 and Figure 6-10 .

[0131] Wherein: the mixed solvent 1 is a compound of γ-butyrolactone, BGA and n-butyl acetate, and the mass ratio of γ-butyrolactone, BGA and n-butyl acetate is 5:3:2.

[0132] The mixed solvent 2 is a compound of γ-butyrolactone, isobutyl alcohol and propylene glycol methyl ether acetate, and the mass ratio of γ-butyrolactone, isobutyl alcohol and propylene glycol methyl ether acetate is 5:3:2.

[0133] The mixed solvent 3 is a mixture of γ-butyrolactone, propylene glycol methyl ether acetate and DBE (dimethyl succinate), and the mass ratio of γ-butyrolactone, propylene glycol methyl ether acetate and DBE is 5:3:2.

[0134] Mixed solvent 4 is a compound of γ-butyrolactone, NEP (N-ethylpyrrolidone) and ethylene glycol monobutyl ether, and the mass ratio of γ-butyrolactone, propylene glycol methyl ether acetate and DBE is 5:3:2.

[0135] The comparative solvent was xylene.

[0136] Table 3

[0137] Mixed solvent 1 Mixed solvent 2 Mixed solvent 3 Mixed solvent 4 Comparative solvent Mass loss (g) 0.0565 0.0049 0.0275 0.0130 0.0959

[0138] From the experimental test results in Table 3, it can be seen that the swelling performance of the mixed solvent of γ-butyrolactone, BGA and n-butyl acetate is better. Although the swelling mass loss of the comparative solvent xylene is higher, the xylene solvent has high toxicity and is not very practical.

Claims

1. An environmentally friendly ink for screen printing of untreated PEVA film, characterized in that: The raw materials include polyurethane resin, chlorinated polyolefin, aldehyde-ketone resin, CAB, dispersant, lubricant, anti-wear agent, defoamer, filler, pigment and mixed solvent; The mixed solvent includes: mixed solvent A, mixed solvent B, mixed solvent C, and mixed solvent D.

2. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 1, characterized in that: The raw materials for preparing the environmentally friendly ink include, by weight, 20-40 parts of polyurethane resin, 5-10 parts of chlorinated polyolefin, 2-15 parts of aldehyde-ketone resin, 5-20 parts of CAB, 0.5-2 parts of dispersant, 1-2 parts of lubricant, 1-2 parts of anti-wear agent, 0.5-1 part of defoamer, 1-5 parts of filler, 5-8 parts of pigment, and 70-100 parts of mixed solvent.

3. The environmentally friendly ink for screen printing of untreated PEVA film according to any one of claims 1-2, characterized in that: The filler includes one or more of aluminum hydroxide, magnesium hydroxide, talc, aluminum oxide, magnesium oxide, silicon oxide, titanium dioxide, calcium silicate, aluminum silicate, calcium carbonate, clay, silicon nitride, silicon carbide, aluminum borate, and synthetic mica.

4. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 3, characterized in that: The pigment includes titanium dioxide, carbon black or powders of other colors.

5. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 1, characterized in that: The mass ratio of the polyurethane resin to the mixed solvent A is (1-2):

1.

6. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 1, characterized in that: The mass ratio of the chlorinated polyolefin to the mixed solvent B is (1-3):

1.

7. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 1, characterized in that: The mass ratio of the aldehyde-ketone resin to the mixed solvent C is (25-45): (45-80).

8. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 1, characterized in that: The mass ratio of CAB to the mixed solvent D is (28-58):(42-72).

9. The environmentally friendly ink for screen printing of untreated PEVA film according to claim 8, wherein the mixed solvent D comprises one or more of γ-butyrolactone, ethylene glycol butyl ether acetate, ethyl ethoxypropionate, ethylene glycol monobutyl ether, propylene glycol methyl ether acetate, and n-butyl acetate.

10. A method for preparing an environmentally friendly ink for screen printing of untreated PEVA film according to any one of claims 1 to 9, characterized in that: include: S1, mixing a polyurethane resin and a mixed solvent A to prepare a polyurethane resin solution; S2, mixing the chlorinated polyolefin and the mixed solvent B to prepare a chlorinated polyolefin solution; S3, mixing the aldehyde-ketone resin and the mixed solvent C to prepare an aldehyde-ketone resin solution; S4, mixing CAB and mixed solvent D to prepare a CAB solution; S5. Mix and stir the polyurethane resin solution, the chlorinated polyolefin solution, the aldehyde-ketone resin solution, the CAB solution, the dispersant, the lubricant, the anti-wear agent, the defoaming agent, the filler and the pigment, and grind them to obtain the product.

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