Anti-corrosion thermosensitive film material for furniture plate label and preparation process of anti-corrosion thermosensitive film material

Abstract

The invention relates to the technical field of thermosensitive synthetic paper, in particular to an anti-corrosion thermosensitive film material for furniture plate labels and a preparation process of the anti-corrosion thermosensitive film material. The anti-corrosion thermosensitive film material for the furniture board label comprises a film base material, and a thermosensitive developing layer, an isolating layer and an anti-corrosion coating which are sequentially coated on the film base material, the anticorrosive coating is prepared from the following raw materials in percentage by mass: 45 to 58 percent of modified epoxy acrylate, 16 to 20 percent of amine modified polyether acrylate, 20 to 23 percent of propylene glycol diacrylate, 3 to 5 percent of benzil photosensitizer, 0.3 to 0.5 percent of dispersing agent I, 0.1 to 0.3 percent of wetting agent, 0.3 to 0.6 percent of vinyl silicone oil and 2 to 4 percent of superfine PTFE (Polytetrafluoroethylene) wax. According to the invention, convenience and environmental protection of a traditional heat-sensitive label can be realized, meanwhile, the heat-sensitive label has the performances such as plate water washing resistance, acid and alkali resistance, corrosion resistance and the like, and all variable information can be still displayed after furniture plates are cleaned.

Description

Technical Field

[0001] The invention relates to the technical field of thermosensitive synthetic paper, and in particular to an anti-corrosion thermosensitive film material for furniture board labels and a preparation process thereof. Background Art

[0002] Thermal printing technology is a common inkless printing technology that uses a thermal print head to convert heat energy into pigments to print text, images and other information. With the development of the electronic information industry and barcode recognition technology, thermal film materials are gradually being widely used in commerce, retail, finance, communications, logistics and other industries. For thermal film materials used in furniture board labels, special coatings or materials are required to meet the requirements.

[0003] Currently, most furniture labels on the market are made of traditional synthetic thermal paper, which has properties such as waterproof, oil-proof and scratch-proof. When the board comes into contact with the washing water during cleaning, the printed information will disappear immediately, and the board information cannot be identified, which will have an adverse effect on the subsequent furniture processing links.

[0004] Therefore, technical personnel in this field urgently need to develop a new anti-corrosion thermosensitive film material for furniture panel labels and its preparation process, so that it has the properties of being resistant to washing board water, acid and alkali, and corrosion-resistant, and can still display all variable information after the furniture panel is cleaned. Summary of the invention

[0005] In view of the problems of the prior art, the purpose of the present invention is to provide an anti-corrosion thermosensitive film material for furniture panel labels and a preparation process thereof, which can be used to manufacture furniture panel labels. While meeting the needs of convenient printing, the product has the properties of being resistant to water, acid and alkali, and corrosion, and can still display all variable information after the furniture panel is cleaned.

[0006] To achieve the above object, the present invention is implemented according to the following technical solutions:

[0007] An anti-corrosion thermosensitive film material for furniture plate labels, comprising a film substrate and a thermosensitive color developing layer, an isolation layer and an anti-corrosion coating sequentially coated on the film substrate;

[0008] The anti-corrosion coating is made of the following raw materials in percentage by mass: 45-58% modified epoxy acrylate, 16-20% amine modified polyether acrylate, 20-23% propylene glycol diacrylate, 3-5% benzil photosensitizer, 0.3-0.5% dispersant 1, 0.1-0.3% wetting agent, 0.3-0.6% vinyl silicone oil, and 2-4% ultrafine PTFE wax;

[0009] The isolation layer is made of the following raw materials in percentage by weight: 10-20% polyvinyl alcohol liquid, 14.5-25.5% acrylic emulsion, 0.5-1.5% leveling agent, and 55-65% pure water;

[0010] The thermosensitive color developing layer is made of the following raw materials in percentage by mass: 12-15% of material A, 30-35% of material B, 5-10% of stearic acid amide emulsion, 15-20% of material C, 20-25% of styrene acrylic emulsion, 0.2-0.5% of mineral oil defoamer, and 0.2-0.5% of dispersant II;

[0011] Among them, material A includes: 30% leuco dye, 30% polyvinyl alcohol liquid, 39.5% pure water, and 0.5% mineral oil defoamer; material B includes: 30% developer, 30% polyvinyl alcohol liquid, 39.5% pure water, and 0.5% mineral oil defoamer; material C includes: 40% kaolin, 10% polyvinyl alcohol liquid, 2% dispersant II, 0.5% mineral oil defoamer, and 47.5% pure water.

[0012] Specifically, the benzil-based photosensitizer is diphenylacetophenone photosensitizer, the dispersant 1 is polyether-modified dimethylsiloxane, the wetting agent is silicone acrylate wetting agent, the leveling agent is polyacrylate leveling agent, and the dispersant 2 is modified styrene maleic acid copolymer solution.

[0013] Specifically, the preparation method of the polyvinyl alcohol solution is:

[0014] The polyvinyl alcohol and pure water in a mass ratio of 1:9 are dissolved at 70-80°C until the liquid becomes clear and transparent without impurities, and then cooled to obtain the product.

[0015] Specifically, the leuco dye is a fluoran lactone compound, which shows color change under high temperature and acidic conditions.

[0016] Specifically, the thickness of the anti-corrosion coating is 2.5-3.5 μm, the thickness of the isolation layer is 2-2.5 μm, the thickness of the thermosensitive color development layer is 2.5-3.5 μm, and the film substrate is a BOPP pearlescent film with a thickness of 75-95 μm.

[0017] The present invention also proposes a preparation process of the anti-corrosion heat-sensitive film material for furniture plate labels, comprising the following steps:

[0018] S1. Preparation of thermosensitive color developing layer: BOPP pearlescent film is used as film substrate, and the thermosensitive color developing layer is coated on the film substrate by using the first coating head of a gravure coater. The coating thickness of the thermosensitive color developing layer is 2.5-3.5 μm. After coating, the film is dried in an oven at 75-85° C.

[0019] S2, using the second coating head of the gravure coater to coat the isolation layer on the thermosensitive color developing layer, the coating thickness of the isolation layer is 2-2.5 μm, and after coating, it is dried in an oven at 75-85° C.;

[0020] S3. Use the third coating head of the gravure coater to apply an anti-corrosion coating on the isolation layer. The thickness of the anti-corrosion coating is 2.5-3.5 μm. After the coating is completed, use an ultraviolet lamp to cure it.

[0021] The preparation process proposed in the present invention combines the traditional hot air drying coating method with the novel light curing coating method. When preparing the anti-corrosion coating, a light curing process is adopted. No heating and drying is required during the coating process, and no drying oven is required, which effectively saves energy and floor space. In addition, the anti-corrosion coating film is formed by solvent-free coating, and almost no pollution is caused to the environment during the film forming process.

[0022] The working principle of the present invention is as follows: the anti-corrosion layer serves as a thermal anti-corrosion coating to increase the protective performance of the thermal label in the use environment. The coating has two main functions: one is to have good slipperiness, reduce the friction between the print head and the thermal film material, and improve the clarity and fineness of thermal color development; the other is to serve as an anti-corrosion layer to protect the thermal color development layer and prevent corrosive substances such as trichloroethylene, diethylene glycol dimethyl ether, isopropyl alcohol, butanediol, strong acids and alkalis from penetrating and destroying the thermal color development layer.

[0023] In the anti-corrosion coating, modified epoxy acrylic resin is a film-forming substance, which plays an important role in the curing process and the film-forming process; amine-modified polyether acrylate serves as a cross-linking agent to adjust the viscosity, curing speed and hardness of the cured film; acrylate isobornyl ester serves as an active diluent to effectively reduce the viscosity of the anti-corrosion coating and improve the leveling of the coating; the role of the benzil photosensitizer is to absorb radiation energy and, after chemical changes, to produce a material stabilizer with active intermediates capable of initiating polymerization, thereby improving the storage stability of the glazing oil; wetting agents and dispersants are used to improve the surface state of the anti-corrosion coating and facilitate coating; the role of vinyl silicone oil is to enhance the smoothness of the anti-corrosion coating so that it can be smoothly printed as a printing label; and the ultrafine PTFE wax provides smoothness while having good scratch resistance.

[0024] In the isolation layer, the polyvinyl alcohol liquid and the acrylic emulsion are mixed to have good film-forming properties. After film formation, the film has good flexibility and strong elasticity, can isolate the reaction of the anti-corrosion coating to the heat-sensitive coating, and prevent the heat-sensitive coating from discoloring prematurely. The leveling agent can significantly reduce the surface energy of the isolation layer.

[0025] In the thermosensitive color-developing layer, the leuco dye is a fluoran lactone compound, which shows color changes under high temperature and acidic conditions; the function of the developer is to provide hydrogen ions when melted at high temperature to make the color of the leuco dye appear; the function of stearic acid amide is to increase the sensitivity of the leuco dye and improve the clarity of the graphic information of the thermosensitive color-developing layer; the styrene acrylic emulsion is used as a film-forming resin to wrap the dye and other powders, so that the texture of the thermosensitive color-developing layer is compact, and the selected styrene acrylic emulsion has good adhesion to the BOPP substrate, and the primer layer can be omitted during coating, saving production costs; kaolin is used as a filler in the coating, has good dispersibility and stability in the water-based system, and has strong hiding power.

[0026] The film substrate adopts BOPP pearlescent film, which is waterproof, oil-proof, untearable, abrasion-resistant, has good stiffness, is not easy to bend, and can meet the needs of manual labeling or automatic labeling when printing furniture panels.

[0027] Compared with the prior art, the present invention has the following beneficial effects:

[0028] The present invention can realize the convenience and environmental protection of traditional thermal labels while having the properties of being resistant to water, acid and alkali, and corrosion, and can still display all variable information after the furniture board is washed. DETAILED DESCRIPTION

[0029] The present invention is further described below with reference to specific embodiments. The illustrative embodiments and descriptions of the present invention are used to explain the present invention but are not intended to limit the present invention.

[0030] The raw materials used in the present invention are purchased from conventional channels or prepared by existing technical methods.

[0031] Example 1

[0032] This embodiment provides an anti-corrosion thermosensitive film material for furniture board labels, comprising a film substrate and a thermosensitive color developing layer, an isolation layer and an anti-corrosion coating sequentially coated on the film substrate;

[0033] The thickness of the anti-corrosion coating is 2.5 μm, the thickness of the isolation layer is 2 μm, the thickness of the thermosensitive color development layer is 2.5 μm, and the film substrate is a BOPP pearlescent film with a thickness of 75 μm.

[0034] Specifically, the anti-corrosion coating is made of the following raw materials in percentage by mass: 46.6% modified epoxy acrylate, 20% amine-modified polyether acrylate, 23% propylene glycol diacrylate, 5% benzil photosensitizer, 0.5% dispersant, 0.3% wetting agent, 0.6% vinyl silicone oil, and 4% ultrafine PTFE wax. The anti-corrosion coating is prepared by the following method:

[0035] At room temperature, modified epoxy acrylate, amine-modified polyether acrylate and propylene glycol diacrylate are mixed in the above proportions and stirred for 10 minutes, then a benzil photosensitizer is added and stirred continuously, and then a dispersant 1, a wetting agent, vinyl silicone oil and ultrafine PTFE wax are added and stirred continuously for 20 minutes to obtain an anti-corrosion coating.

[0036] In this embodiment, the isolation layer is made of the following raw materials in percentage by weight: 10% polyvinyl alcohol liquid, 25% acrylic emulsion, 0.5% leveling agent, and 64.5% pure water, and the preparation method of the isolation layer is as follows:

[0037] 1. Preparation of polyvinyl alcohol solution: select a certain amount of polyvinyl alcohol and pure water, the ratio of the two is 1:9, and neutralize at 70-80℃ until it is clear and transparent without impurities, and cool it for use;

[0038] 2. Weigh a certain amount of pure water, add the leveling agent and stir for 5 minutes, then add the prepared polyvinyl alcohol solution and acrylic emulsion according to the above proportion, and disperse for 10 minutes at room temperature to obtain the isolation layer coating.

[0039] In this embodiment, the preparation method of the thermosensitive color developing layer is as follows:

[0040] 1. Preparation of material A: 30% leuco dye, 30% polyvinyl alcohol solution, 39.5% pure water, 0.5% mineral oil defoamer, mix and disperse into a uniform slurry for standby use; the leuco dye is 3-diethylamino-7-chlorofluoran;

[0041] 2. Preparation of material B: 30% color developer, 30% polyvinyl alcohol solution, 39.5% pure water, 0.5% mineral oil defoamer, mix and disperse into a uniform slurry for later use; the color developer is 4-hydroxy-4'-isopropoxydiphenyl sulfone;

[0042] 3. Preparation of material C: 40% kaolin, 10% polyvinyl alcohol liquid, 2% dispersant II, 0.5% mineral oil defoamer, 47.5% pure water, mix and disperse into a uniform slurry for later use;

[0043] 4. Preparation of coating: 13% A material, 35% B material, 6% stearic acid amide emulsion, 20% C material, 25% styrene acrylic emulsion, 0.5% mineral oil defoamer, 0.5% dispersant 2; quantitatively weigh the slurry and other raw materials according to the above proportions, and disperse them together for 30 minutes to obtain a thermosensitive color development layer coating.

[0044] In this embodiment, the preparation method of the anti-corrosion heat-sensitive film material for furniture plate labels is as follows:

[0045] A 2.5 μm thermosensitive color developing layer is coated on a 75 μm BOPP pearlescent film, and after being dried with hot air at 70-80°C, a 2 μm isolation layer is coated on the thermosensitive color developing layer, and then dried with hot air at 70-80°C, a 2.5 μm anti-corrosion coating is coated on the isolation layer, and then cured with an ultraviolet lamp (curing conditions: 80J).

[0046] More specifically, the benzil-based photosensitizer is diphenylacetophenone photosensitizer, the dispersant 1 is polyether-modified dimethylsiloxane, the wetting agent is silicone acrylate wetting agent, the leveling agent is polyacrylate leveling agent, and the model of the polyacrylate leveling agent is BYK361N, and the dispersant 2 is modified styrene maleic acid copolymer solution. The mineral oil defoamer is BASF MO2134 mineral oil defoamer.

[0047] Example 2

[0048] The difference between this embodiment and embodiment 1 is only that:

[0049] The thickness of the anticorrosive coating is 3.0 μm, the thickness of the isolation layer is 2.5 μm, the thickness of the thermosensitive color development layer is 3.0 μm, and the film substrate is a BOPP pearlescent film with a thickness of 80 μm.

[0050] The anticorrosive coating is made of the following raw materials in percentage by mass: 58% modified epoxy acrylate, 16% amine modified polyether acrylate, 20% propylene glycol diacrylate, 3.3% benzil photosensitizer, 0.3% dispersant, 0.1% wetting agent, 0.3% vinyl silicone oil and 2% ultrafine PTFE wax.

[0051] In this embodiment, the preparation method of the anti-corrosion heat-sensitive film material for furniture plate labels is as follows:

[0052] A 3.0 μm thermosensitive color developing layer is coated on the 85 μm BOPP pearlescent film, and after being dried with hot air at 80-85°C, a 2.5 μm isolation layer is coated on the thermosensitive color developing layer, and then dried with hot air at 80°C, a 3.0 μm anti-corrosion coating is coated on the isolation layer, and then cured with an ultraviolet lamp (curing conditions: 80J).

[0053] Example 3

[0054] The only difference between this embodiment and embodiment 1 is that the thickness of the anticorrosive coating is 3.5 μm, the thickness of the isolation layer is 2.5 μm, the thickness of the thermosensitive color development layer is 3.5 μm, and the film substrate is a BOPP pearlescent film with a thickness of 95 μm.

[0055] The anti-corrosion coating is made of the following raw materials in percentage by mass: 52.7% modified epoxy acrylate, 18% amine modified polyether acrylate, 21% propylene glycol diacrylate, 4% benzil photosensitizer, 0.5% dispersant, 0.3% wetting agent, 0.5% vinyl silicone oil and 3% ultrafine PTFE wax.

[0056] In this embodiment, the preparation method of the anti-corrosion heat-sensitive film material for furniture plate labels is as follows:

[0057] A 3.5 μm thermosensitive color developing layer is coated on the 80 μm BOPP pearlescent film, and after being dried with hot air at 80-85°C, a 2.5 μm isolation layer is coated on the thermosensitive color developing layer, and then dried with hot air at 80°C, a 3.5 μm anti-corrosion coating is coated on the isolation layer, and then cured with an ultraviolet lamp (curing conditions: 90J).

[0058] Comparative Example 1

[0059] The only difference between this comparative example and Example 1 is that no benzil photosensitizer is added to the anti-corrosion coating paint in this comparative example, and the mass percentages of the remaining components in the raw materials are adjusted as follows: 53.7% modified epoxy acrylate, 20% amine-modified polyether acrylate, 22% propylene glycol diacrylate, 0.5% dispersant 1, 0.3% wetting agent, 0.5% vinyl silicone oil, and 3% ultrafine PTFE wax.

[0060] Comparative Example 2

[0061] The difference between this comparative example and Example 1 is that no vinyl silicone oil and PTFE wax are added to the anticorrosive coating paint in this comparative example. The mass percentages of the remaining components in the raw materials are adjusted as follows: 55.2% modified epoxy acrylate, 17% amine modified polyether acrylate, 22.3% propylene glycol diacrylate, 4.7% benzil photosensitizer, 0.5% dispersant 1, and 0.3% wetting agent.

[0062] In summary, in Examples 1 to 3 and Comparative Examples 1 to 2, the raw material composition of the anti-corrosion coating is shown in Table 1 below:

[0063] Table 1: Ratio of raw materials for anticorrosive coating in various embodiments and comparative examples

[0064]

[0065] The products obtained in Examples 1 to 3 and Comparative Examples 1 to 2 were tested according to the following method:

[0066] 1. Oil and ethanol resistance test

[0067] First, place the saturated coloring sample on a flat glass with the coloring side facing up, and then place the liquid circle on the coloring area of ​​the sample. Pipette 1.0mL of lubricating oil and 95% ethanol solution and drop them into the corresponding liquid circle. After leaving it at room temperature for 15 minutes, remove the liquid circle and gently absorb the lubricating oil and ethanol solution remaining on the surface of the sample with filter paper. After drying with cold air from a hair dryer, measure its color density value. Measure three samples for each protective performance, take three points for each sample, and take the average value of the nine points as the result of the corresponding protective performance.

[0068] 2. Acid and alkali resistance, water resistance test

[0069] Place the saturated color sample face up on a flat glass, absorb 1 ml of the reagent and drop it evenly on the surface of the printed sample. Let it soak for 30 seconds and then wipe it clean. Blow it dry with cold air from a hair dryer and then measure its color density value.

[0070] 3. Alcohol friction resistance test (75% alcohol)

[0071] Place the saturated color sample surface flat on the alcohol friction tester, load 500g, rub the print at a speed of 60 times / min, and observe with the naked eye that the handwriting is clear and complete.

[0072] According to the above detection method, the test results are shown in Table 2 below:

[0073] Table 2 Comparison of test results

[0074] Protective testing items Example 1 Example 2 Example 3 Comparative Example 1 Comparative Example 2 Oil proof (lubricating oil) 99％ 99％ 99％ - 80％ Alcohol proof (95% industrial alcohol) 82％ 86％ 90％ - 30％ Resistant to 10% sodium hydroxide solution 90％ 93％ 95％ - 40％ Resistant to 10% hydrochloric acid solution 90％ 92％ 96％ - - Resistant to PUR washing water 73％ 78％ 82％ - Alcohol friction resistance (75%) 135 times 260 times 330 times - 18 times

[0075] As can be seen from the above table, in Examples 1 to 3, as the thickness of the anti-corrosion coating increases, the protective performance is improved; the comparative example 1 in which no benzil photosensitizer is added cannot be cured normally after coating and cannot be tested; the comparative example 2 in which no vinyl silicone oil and PTFE wax are added has poor protective performance due to poor lubricity.

[0076] The technical solution of the present invention is not limited to the above-mentioned specific embodiments. All technical variations made according to the technical solution of the present invention fall within the protection scope of the present invention.

Claims

1. An anti-corrosion thermal film material for furniture board labels, It is characterized in that It includes a film substrate and a thermosensitive color developing layer, an isolation layer and an anti-corrosion coating sequentially coated on the film substrate; The anti-corrosion coating is made of the following raw materials in percentage by mass: 45-58% modified epoxy acrylate, 16-20% amine modified polyether acrylate, 20-23% propylene glycol diacrylate, 3-5% benzil photosensitizer, 0.3-0.5% dispersant 1, 0.1-0.3% wetting agent, 0.3-0.6% vinyl silicone oil, and 2-4% ultrafine PTFE wax; The isolation layer is made of the following raw materials in percentage by mass: 10-20% polyvinyl alcohol liquid, 14.5-25.5% acrylic emulsion, 0.5-1.5% leveling agent, and 55-65% pure water.

2. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The thermosensitive color developing layer is made of the following raw materials in percentage by mass: 12-15% of material A, 30-35% of material B, 5-10% of stearic acid amide emulsion, 15-20% of material C, 20-25% of styrene acrylic emulsion, 0.2-0.5% of mineral oil defoamer, and 0.2-0.5% of dispersant II; Among them, material A includes: 30% leuco dye, 30% polyvinyl alcohol liquid, 39.5% pure water, and 0.5% mineral oil defoamer; material B includes: 30% developer, 30% polyvinyl alcohol liquid, 39.5% pure water, and 0.5% mineral oil defoamer; material C includes: 40% kaolin, 10% polyvinyl alcohol liquid, 2% dispersant II, 0.5% mineral oil defoamer, and 47.5% pure water.

3. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 2, It is characterized in that The benzil photosensitizer adopts diphenylacetophenone photosensitizer, the dispersant 1 adopts polyether modified dimethylsiloxane, the wetting agent adopts silicone acrylate wetting agent, the leveling agent adopts polyacrylate leveling agent, and the dispersant 2 adopts modified styrene maleic acid copolymer solution.

4. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The preparation method of the polyvinyl alcohol solution is: The polyvinyl alcohol and pure water in a mass ratio of 1:9 are dissolved at 70-80°C until the liquid becomes clear and transparent without impurities, and then cooled to obtain the product.

5. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 2, It is characterized in that The leuco dye is a fluoran lactone compound, which changes color under high temperature and acidic conditions.

6. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The thickness of the anti-corrosion coating is 2.5-3.5 μm.

7. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The thickness of the isolation layer is 2-2.5 μm.

8. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The thickness of the thermosensitive color developing layer is 2.5-3.5 μm.

9. The anti-corrosion heat-sensitive film material for furniture board labels according to claim 1, It is characterized in that The film substrate is a BOPP pearlescent film with a thickness of 75-95 μm.

10. A process for preparing an anti-corrosion heat-sensitive film material for furniture board labels according to any one of claims 1 to 5, It is characterized in that The steps include: S1. Preparation of thermosensitive color developing layer: BOPP pearlescent film is used as film substrate, and the thermosensitive color developing layer is coated on the film substrate by using the first coating head of a gravure coater. The coating thickness of the thermosensitive color developing layer is 2.5-3.5 μm. After coating, the film is dried in an oven at 75-85° C. S2, using the second coating head of the gravure coater to coat the isolation layer on the thermosensitive color developing layer, the coating thickness of the isolation layer is 2-2.5 μm, and after coating, it is dried in an oven at 75-85° C.; S3. Use the third coating head of the gravure coater to apply an anti-corrosion coating on the isolation layer. The thickness of the anti-corrosion coating is 2.5-3.5 μm. After the coating is completed, use an ultraviolet lamp to cure it.

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