Degradable printing adhesive tape and preparation method thereof
By using pressure-sensitive adhesives prepared by acrylate block copolymers containing thioester functional groups and combined with light crosslinking technology, the problem of non-degradability of traditional pressure-sensitive adhesives is solved, and the degradability and high peel strength of the printed tape are achieved.
Patent Information
- Application Number
- CN202510233492.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-02-28
- Publication Date
- 2025-05-23
AI Technical Summary
Traditional pressure-sensitive adhesives are non-degradable after use, resulting in environmental problems in the recycling of cardboard and glass, and existing removal methods have problems with polymer gels that are difficult to completely decompose.
The pressure-sensitive adhesive prepared from acrylate block copolymer containing thioester functional groups is used and applied on a bidirectional stretched polypropylene film by light crosslinking technology to form a degradable printing tape.
The goal of printing tape being easily decomposed after use or being easily decomposed during the recycling process is achieved, the problem of residual insoluble sticky substances is avoided, and the needs of green, degradable and recyclable are met.
Smart Images
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Abstract
Description
Technical Field
[0001] The invention relates to the technical field of printed adhesive tapes, in particular to a degradable printed adhesive tape and a preparation method thereof. Background Art
[0002] In recent years, pressure-sensitive adhesives (PSAs) have become an important material in the packaging field due to their wide application. They are often used in labels, tapes and other packaging products. However, traditional PSAs are non-degradable after use, which can cause environmental problems, especially during the recycling process of cardboard and glass. These adhesive residues are usually composed of cross-linked viscoelastic polymers, and their irreversible cross-linked structure makes them difficult to decompose or remove during the recycling process. These residual "insoluble stickies" not only reduce the quality of recycled materials, but may also damage repulping equipment, thereby increasing processing costs and affecting resource recycling efficiency. Although existing technologies attempt to remove PSA residues through chemical treatment, a large amount of non-degradable polymer gel is still produced after treatment, which brings new challenges to waste management and environmental protection.
[0003] Therefore, developing a degradable pressure-sensitive adhesive material that can be naturally degraded after use or easily decomposed during recycling has become a key issue that needs to be solved in the current technical field. This material not only needs to maintain excellent adhesion properties, but also needs to be environmentally friendly and achieve sustainable resource utilization while meeting practical application requirements. Summary of the invention
[0004] The object of the present invention is to provide a degradable printed adhesive tape and a preparation method thereof, so as to solve the problems raised in the prior art.
[0005] To achieve the above object, the present invention provides the following technical solutions: A degradable printed tape, which is prepared by coating a pressure-sensitive adhesive on a biaxially oriented polypropylene film having a printed pattern on the surface; Furthermore, the pressure-sensitive adhesive is prepared from an acrylate block copolymer containing a thioester functional group; Furthermore, the preparation method of the acrylic ester block copolymer comprises the following steps: Add acrylated poly(lactic acid-pentadecyl caprolactone), n-butyl acrylate, vinyl acetate, methacrylic acid, 4-acryloxybenzophenone, and dibenzoxazinethione compound into a reaction container in sequence, add anionic surfactant, nonionic surfactant, sodium bicarbonate, catalyst, and ultrapure water, ultrasonically treat, heat to 70-80° C. under a nitrogen atmosphere, react for 3-12 hours, and cool to obtain an acrylate block copolymer.
[0006] Furthermore, the anionic surfactant includes any one of nonylphenol polyoxyethylene ether phosphate salt, nonylphenol polyoxyethylene ether carboxylate salt, and nonylphenol polyoxyethylene ether acid ester salt.
[0007] Furthermore, the nonionic surfactant is NP-10.
[0008] Furthermore, the catalyst is potassium persulfate.
[0009] Furthermore, the proportion of each component in the preparation process of the acrylate block copolymer includes, by mass, 4-6 parts of acrylated poly(lactic acid-pentadecyl caprolactone), 4-6 parts of n-butyl acrylate, 0.25-0.3 parts of vinyl acetate, 0.35-0.4 parts of methacrylic acid, 0.025-0.05 parts of 4-acryloxybenzophenone, 0.0125-0.025 parts of dibenzoxazinethione compound, 0.7-0.8 parts of anionic surfactant, 0.1-0.15 parts of nonionic surfactant, 0.05-0.055 parts of sodium bicarbonate, 0.03-0.035 parts of catalyst, and 16-18 parts of ultrapure water.
[0010] Furthermore, the preparation method of the dibenzoxazinethione compound comprises the following steps: Add dibenzo[C,E]oxathiophene-5(7H)-one to anhydrous toluene, stir evenly, add Lawesson's reagent, heat under reflux for 22-24 hours, concentrate in vacuo, and purify to obtain a dibenzooxathiophene thione compound; Furthermore, in the preparation process of the dibenzoxazolidinethione compound, the molar ratio of dibenzo[C,E]oxazol-5(7H)-one:Lawson's reagent is 2:1; and the purification is performed by hexane-ethyl acetate column chromatography with a volume ratio of 4:1.
[0011] Furthermore, the preparation method of 4-acryloxybenzophenone comprises the following steps: Add acryloyl chloride to anhydrous dichloromethane, add an anhydrous dichloromethane solution of 4-hydroxybenzophenone and triethylamine under ice bath conditions, react at room temperature for 12-13 hours, filter, wash with deionized water, dry with anhydrous magnesium sulfate, filter, vacuum dry, and purify to obtain 4-acryloyloxybenzophenone; Furthermore, in the preparation process of the 4-acryloxybenzophenone, the molar ratio of acryloyl chloride: 4-hydroxybenzophenone: triethylamine is 1.5:1:1.05; and the purification is performed by recrystallization in n-hexane at 40°C.
[0012] Furthermore, the preparation method of the acrylic acid esterified poly (lactic acid-pentadecyl caprolactone) comprises the following steps: S1: Add cardanol, palladium carbon and hexane into a reaction vessel, seal and pressurize to 100 psig with hydrogen, maintain for 5-6 minutes and then exhaust to 30 psig, repeat the above pressurization-exhaust process, pressurize to 600 psig, heat to 80-82°C, keep the temperature and pressure for 24 hours, cool to room temperature, filter, wash with hexane, vacuum dry, purify to obtain pentadecylcyclohexanone; S2: Add m-chloroperbenzoic acid to anhydrous dichloromethane, remove moisture from the separated phase, dry with magnesium sulfate, filter, cool in an ice bath, add an anhydrous dichloromethane solution of pentadecylcyclohexanone, react at room temperature for 4-4.5 hours, cool in an ice bath, filter, wash with 10% sodium bisulfite aqueous solution, saturated sodium bicarbonate, and brine, dry with magnesium sulfate, filter, and dry in vacuo to obtain pentadecyl caprolactone; S3: under an argon atmosphere, pentadecyl hexalactone, 1,4-benzenedimethanol, and stannous octoate were added to a reaction vessel, heated to 110-112° C. for reaction for 5-6 h, cooled in an ice bath, the product was added to -10° C. methanol, filtered, and vacuum dried to obtain poly(pentadecyl hexalactone) containing a hydroxyl functional group; S4: Under a nitrogen atmosphere, hydroxyethyl methacrylate, lactide, poly (pentadecyl caprolactone) and stannous octoate are added into a reaction vessel, heated to 130-132°C for reaction for 4-4.5 hours, cooled in an ice bath, washed with n-pentane-ethanol solution, and vacuum dried to obtain acrylated poly (lactic acid-pentadecyl caprolactone).
[0013] Furthermore, during the washing process with the n-pentane-ethanol solution, the volume ratio of n-pentane:ethanol is 3:1.
[0014] Furthermore, in the preparation process of pentadecylcyclohexanone, the mass ratio of cardanol: palladium carbon is 4:1; during the heat preservation and pressure retention reaction process, when the pressure drops to 450psig, it is re-pressurized to 600psig, the filtration is to pass the reaction product through diatomaceous earth, and the purification is purification by column chromatography.
[0015] Furthermore, in the preparation process of pentadecyl caprolactone, the mass ratio of meta-chloroperbenzoic acid:pentadecylcyclohexanone is 13.9:16.0.
[0016] Furthermore, in the preparation process of the poly(pentadecyl caprolactone), the molar ratio of pentadecyl caprolactone:1,4-benzenedimethanol:stannous octoate is 2.91:0.15:0.15.
[0017] Furthermore, in the preparation process of the acrylic acid esterified poly(lactic acid-pentadecyl caprolactone), the molar ratio of hydroxyethyl methacrylate: lactide: poly(pentadecyl caprolactone): stannous octoate is 1:(5-6):(3-4):0.1.
[0018] A method for preparing a degradable printed adhesive tape comprises the following steps: coating a pressure-sensitive adhesive on one side of a biaxially stretched polypropylene film having a printed pattern on the surface, and cross-linking the film by light to obtain the degradable printed adhesive tape.
[0019] Furthermore, the light cross-linking is performed by irradiating with 365 nm ultraviolet light for 10-12 min.
[0020] Furthermore, the thickness of the pressure-sensitive adhesive is 50-60 μm, and the thickness of the biaxially oriented polypropylene film is 0.08-0.1 mm.
[0021] Compared with the prior art, the present invention has the following beneficial effects: 1. In order to solve the problem that the raw materials of the pressure-sensitive adhesive of the current printing tape mainly come from petrochemical resources and are not easy to degrade, the present invention uses the renewable resource cardanol raw material to prepare a new aliphatic polyester poly (pentadecyl caprolactone) with a long alkyl substituent, uses poly (pentadecyl caprolactone) as a macromolecular initiator, and prepares acrylated poly (lactic acid-pentadecyl caprolactone) by copolymerization with lactide and 2-hydroxyethyl methacrylate, and uses acrylated poly (lactic acid-pentadecyl caprolactone) as an acrylate macromolecular monomer, and prepares a pressure-sensitive adhesive with excellent peeling performance and degradable performance by free radical copolymerization with n-butyl acrylate, 4-acryloxybenzophenone photocrosslinker, and dibenzoxazolidinethione compound.
[0022] 2. By adjusting the ratio between acrylic acid esterified poly (lactic acid-pentadecyl caprolactone), n-butyl acrylate, and dibenzoxazinethione compounds, a perfect balance between peeling performance and degradable performance is achieved, which greatly improves the application scenarios of printing tapes while also meeting the goals of being green, degradable, recyclable, and renewable.
[0023] 3. By introducing 4-acryloxybenzophenone photocrosslinking agent into the structure, the crosslinking density between the resin matrix is enhanced by ultraviolet irradiation, thereby enhancing the peel strength performance of the degradable printed tape; the introduction of acrylated poly (lactic acid-pentadecyl caprolactone) reduces the involvement of petrochemical resources while ensuring the peel strength performance of the printed tape, giving it degradable, green and renewable properties; the introduction of dibenzoxazinethione compounds can degrade the main chain thioester through aminolysis or thiolysis during use, resulting in complete dissolution of the network, loss of adhesive properties, and the label will quickly fall off the substrate, further improving the degradability and recyclability of the printed tape. DETAILED DESCRIPTION
[0024] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.
[0025] In the following examples, biaxially oriented polypropylene film was purchased from Foshan Yitong Packaging Products Co., Ltd., model number boppm, elongation at break: MD≤220%, TD≤80%, tensile strength: MD≥125MPa, TD≥220MPa; the remaining raw materials are commercially available.
[0026] The preparation method of a dibenzoxazinethione compound comprises the following steps: 2 mmol of dibenzo[C,E]oxazolidin-5(7H)-one was added to anhydrous toluene, stirred evenly, 1 mmol of Lawesson's reagent was added, heated under reflux for 22 h, concentrated in vacuo, and purified by 4:1 hexane-ethyl acetate column chromatography to obtain a dibenzooxazolidinone compound.
[0027] The preparation method of 4-acryloxybenzophenone comprises the following steps: 1.5 mmol of acryloyl chloride was added to anhydrous dichloromethane, and 1 mmol of 4-hydroxybenzophenone and 1.05 mmol of triethylamine in 35 mL of anhydrous dichloromethane were added under ice bath conditions, and the mixture was reacted at room temperature for 12-13 hours, filtered, washed with deionized water, dried over anhydrous magnesium sulfate, filtered, dried under vacuum, and purified by recrystallization in n-hexane at 40°C to obtain 4-acryloyloxybenzophenone.
[0028] Example 1: A method for preparing a degradable printed tape: S1: 40 g of cardanol, 10 g of palladium carbon, and 300 mL of hexane are added to a reaction container, sealed with hydrogen and pressurized to 100 psig, maintained for 5-6 minutes, and then vented to 30 psig, and the pressurization-venting process is repeated, pressurized to 600 psig, heated to 80°C, kept warm and reacted for 24 hours, cooled to room temperature, and the reaction product was filtered through diatomaceous earth, washed with hexane, vacuum dried, and purified by column chromatography to obtain pentadecylcyclohexanone; S2: Add 13.9 g of m-chloroperbenzoic acid to 150 mL of anhydrous dichloromethane, remove moisture from the separated phase, dry with magnesium sulfate, filter, cool in an ice bath, add 16.0 g of a solution of pentadecylcyclohexanone in 160 mL of anhydrous dichloromethane, react at room temperature for 4 h, cool in an ice bath, filter, wash with 10% aqueous sodium bisulfite solution, saturated sodium bicarbonate, and brine, dry with magnesium sulfate, filter, and dry in vacuo to obtain pentadecyl caprolactone; S3: Under an argon atmosphere, 2.91 mmol of pentadecyl hexalactone, 0.15 mmol of 1,4-benzenedimethanol, and 0.15 mmol of stannous octoate were added to a reaction vessel, heated to 110°C for reaction for 5 h, cooled in an ice bath, and the product was added to -10°C methanol, filtered, and vacuum dried to obtain poly(pentadecyl hexalactone) containing a hydroxyl functional group; S4: Under a nitrogen atmosphere, 1 mmol of hydroxyethyl methacrylate, 6 mmol of lactide, 3 mmol of poly (pentadecyl caprolactone), and 0.1 mmol of stannous octoate were added to a reaction vessel, heated to 130° C. for 4 h, cooled in an ice bath, washed with a n-pentane-ethanol solution, and dried in vacuo to obtain acrylated poly (lactic acid-pentadecyl caprolactone); S5: 4 parts of acrylic acid esterified poly (lactic acid-pentadecyl caprolactone), 6 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.025 parts of 4-acryloxybenzophenone, 0.0125 parts of dibenzoxazinethione compound are added to a reaction container in sequence, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed. In a nitrogen atmosphere, the mixture is heated to 70-80° C. for reaction for 3-12 hours, and then cooled to obtain an acrylate block copolymer; S6: coating a pressure-sensitive adhesive on one side of a biaxially oriented polypropylene film having a printed pattern on the surface, and cross-linking the film under light for 10 minutes to obtain a degradable printed tape; The thickness of the biaxially oriented polypropylene film is 0.08 mm, and the thickness of the pressure-sensitive adhesive is 50 μm.
[0029] Example 2: A method for preparing a degradable printed tape: S4: Under a nitrogen atmosphere, 1 mmol of hydroxyethyl methacrylate, 5 mmol of lactide, 4 mmol of poly (pentadecyl caprolactone), and 0.1 mmol of stannous octoate are added to a reaction container, heated to 130° C. for reaction for 4 h, cooled in an ice bath, washed with a n-pentane-ethanol solution, and vacuum dried to obtain acrylated poly (lactic acid-pentadecyl caprolactone); The remaining steps are the same as in Example 1.
[0030] Example 3: A method for preparing a degradable printed tape: S5: 6 parts of acrylated poly (lactic acid-pentadecyl caprolactone), 4 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.025 parts of 4-acryloxybenzophenone, and 0.0125 parts of dibenzoxazinethione compound are added to a reaction container in sequence, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed. In a nitrogen atmosphere, the mixture is heated to 70-80°C for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; The remaining steps are the same as those in Example 2.
[0031] Example 4: A method for preparing a degradable printed tape: S5: 6 parts of acrylated poly (lactic acid-pentadecyl caprolactone), 4 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.05 parts of 4-acryloxybenzophenone, and 0.025 parts of dibenzoxazinethione compound are added to a reaction container in sequence, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed. In a nitrogen atmosphere, the mixture is heated to 70-80°C for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; The remaining steps are the same as those in Example 2.
[0032] Comparative Example 1: A method for preparing a degradable printed tape: S5: 4 parts of acrylated poly(lactic acid-pentadecyl caprolactone), 6 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, and 0.025 parts of 4-acryloxybenzophenone are added to a reaction container in sequence, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed, and the mixture is heated to 70-80°C under a nitrogen atmosphere for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; The remaining steps are the same as those in Example 1.
[0033] Comparative Example 2: A method for preparing a degradable printed tape: S5: 4 parts of acrylated poly (lactic acid-pentadecyl caprolactone), 6 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.025 parts of 4-acryloxybenzophenone, and 0.0125 parts of dibenzoxazinethione compound are sequentially added to a reaction container, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed. In a nitrogen atmosphere, the mixture is heated to 70-80°C for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; S6: applying a pressure-sensitive adhesive to one side of a biaxially oriented polypropylene film having a printed pattern on the surface, and drying the film to obtain a degradable printed tape; The thickness of the biaxially oriented polypropylene film is 0.08 mm, and the thickness of the pressure-sensitive adhesive is 50 μm.
[0034] The remaining steps are the same as those in Example 1.
[0035] Comparative Example 3: A method for preparing a degradable printed tape: S5: 4 parts of acrylated poly (lactic acid-pentadecyl caprolactone), 6 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.025 parts of 4-acryloxybenzophenone, and 0.0125 parts of dibenzoxazinethione compound are added to a reaction container in sequence, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of azoisobutyronitrile, and 16 parts of ultrapure water are added, ultrasonically treated, heated to 70-80°C under a nitrogen atmosphere for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; The remaining steps are the same as those in Example 1.
[0036] Comparative Example 4: A method for preparing a degradable printed tape: S5: 8 parts of acrylated poly (lactic acid-pentadecyl caprolactone), 2 parts of n-butyl acrylate, 0.25 parts of vinyl acetate, 0.35 parts of methacrylic acid, 0.025 parts of 4-acryloxybenzophenone, and 0.0125 parts of dibenzoxazinethione compound are sequentially added to a reaction container, and 0.7 parts of nonylphenol polyoxyethylene ether ester salt, 0.1 parts of NP-10, 0.05 parts of sodium bicarbonate, 0.03 parts of potassium persulfate, and 16 parts of ultrapure water are added, and ultrasonic treatment is performed. Under a nitrogen atmosphere, the mixture is heated to 70-80° C. for reaction for 3-12 hours, and cooled to obtain an acrylate block copolymer; The remaining steps are the same as those in Example 1.
[0037] Experiment: Peel strength performance test: The acrylate block copolymer prepared in the above examples and comparative examples was coated on a 2 mil thick PET film to prepare a pressure-sensitive adhesive layer. The size of the PET film was 10 in × 12 in, and the coating amount was 28 g / m 2 , UV light cross-linking for 10 min to obtain the experimental degradable printed tape, and its peel strength was tested according to ASTM D903−98.
[0038] Degradable performance test: The previously prepared experimental degradable printed tape was pasted on the surface of steel and immersed in a 7M ammonia methanol solution. The time for the degradable printed tape to float from the steel surface was observed and recorded as t 1 The previously prepared experimental degradable printed tape was pasted on the surface of the steel and immersed in ethanol containing 100mM N-acetylcysteine and 100mM DBU. The time for the degradable printed tape to float off the steel surface was observed and recorded as t 2 .
[0039] Table 1 Experimental performance data of biodegradable printed tape Conclusion: The printed adhesive tape prepared by the present invention has excellent peel strength and degradability. Degradation of the main chain thioester by aminolysis or thiolysis will lead to complete dissolution of the network, avoiding the problem of residual insoluble adhesive residues, and can be completely removed from the surface of the substrate.
[0040] In Comparative Example 1, no dibenzoxazinethione compound was introduced, resulting in reduced degradability.
[0041] In Comparative Example 2, no UV light crosslinking was performed, resulting in reduced peel strength.
[0042] In Comparative Example 3, azobisisobutyronitrile was used as a catalyst to replace potassium persulfate for the reaction. When azobisisobutyronitrile was used as a catalyst, the reaction mainly occurred in the monomer droplets, which is not suitable for the present invention.
[0043] In Comparative Example 4, too much acrylated poly(lactic acid-pentadecyl caprolactone) participated in the copolymerization reaction, resulting in a decrease in peel strength.
[0044] Too little acrylated poly(lactic acid-pentadecyl caprolactone) does not meet the green, renewable and degradable requirements of the present invention and is discarded.
[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential features of the present invention. Therefore, the embodiments should be considered exemplary and non-restrictive in all respects, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims be included in the present invention.
Claims
1. A degradable printed tape, characterized in that: The degradable printed tape is prepared by coating a biaxially oriented polypropylene film with a printed pattern on the surface with a pressure-sensitive adhesive and cross-linking; The pressure-sensitive adhesive is prepared from an acrylate block copolymer containing a thioester functional group; The preparation method of the acrylic acid ester block copolymer comprises the following steps: Add acrylated poly(lactic acid-pentadecyl caprolactone), n-butyl acrylate, vinyl acetate, methacrylic acid, 4-acryloxybenzophenone, and dibenzoxazinethione compound into a reaction container in sequence, add anionic surfactant, nonionic surfactant, sodium bicarbonate, catalyst, and ultrapure water, ultrasonically treat, heat to 70-80° C. under a nitrogen atmosphere, react for 3-12 hours, and cool to obtain an acrylate block copolymer.
2. A degradable printed tape according to claim 1, characterized in that: The proportions of various components in the preparation process of the acrylate block copolymer include, by mass: 4-6 parts of acrylated poly(lactic acid-pentadecyl caprolactone), 4-6 parts of n-butyl acrylate, 0.25-0.3 parts of vinyl acetate, 0.35-0.4 parts of methacrylic acid, 0.025-0.05 parts of 4-acryloxybenzophenone, 0.0125-0.025 parts of dibenzoxazinethione compound, 0.7-0.8 parts of anionic surfactant, 0.1-0.15 parts of nonionic surfactant, 0.05-0.055 parts of sodium bicarbonate, 0.03-0.035 parts of catalyst, and 16-18 parts of ultrapure water.
3. The degradable printed tape according to claim 1, characterized in that: The preparation method of the dibenzoxazinethione compound comprises the following steps: Add dibenzo[C,E]oxathiophene-5(7H)-one to anhydrous toluene, stir evenly, add Lawesson's reagent, heat under reflux for 22-24 hours, concentrate in vacuo, and purify to obtain a dibenzooxathiophene thione compound; In the preparation process of the dibenzoxazolidinethione compound, the molar ratio of dibenzo[C,E]oxazolidine-5(7H)-one to Lawesson's reagent is 2:
1.
4. The degradable printed tape according to claim 1, characterized in that: The preparation method of 4-acryloxybenzophenone comprises the following steps: Add acryloyl chloride to anhydrous dichloromethane, add an anhydrous dichloromethane solution of 4-hydroxybenzophenone and triethylamine under ice bath conditions, react at room temperature for 12-13 hours, filter, wash with deionized water, dry with anhydrous magnesium sulfate, filter, vacuum dry, and purify to obtain 4-acryloyloxybenzophenone; In the preparation process of 4-acryloxybenzophenone, the molar ratio of acryloyl chloride:4-hydroxybenzophenone:triethylamine is 1.5:1:1.
05.
5. The degradable printed tape according to claim 1, characterized in that: The preparation method of the acrylic acid esterified poly (lactic acid-pentadecyl caprolactone) comprises the following steps: S1: Add cardanol, palladium carbon and hexane into a reaction vessel, seal and pressurize to 100 psig with hydrogen, maintain for 5-6 minutes and then exhaust to 30 psig, repeat the above pressurization-exhaust process, pressurize to 600 psig, heat to 80-82°C, keep the temperature and pressure for 24 hours, cool to room temperature, filter, wash with hexane, vacuum dry, purify to obtain pentadecylcyclohexanone; S2: Add m-chloroperbenzoic acid to anhydrous dichloromethane, remove moisture from the separated phase, dry with magnesium sulfate, filter, cool in an ice bath, add an anhydrous dichloromethane solution of pentadecylcyclohexanone, react at room temperature for 4-4.5 hours, cool in an ice bath, filter, wash with 10% sodium bisulfite aqueous solution, saturated sodium bicarbonate, and brine, dry with magnesium sulfate, filter, and dry in vacuo to obtain pentadecyl caprolactone; S3: under an argon atmosphere, pentadecyl hexalactone, 1,4-benzenedimethanol, and stannous octoate were added to a reaction vessel, heated to 110-112° C. for reaction for 5-6 h, cooled in an ice bath, the product was added to -10° C. methanol, filtered, and vacuum dried to obtain poly(pentadecyl hexalactone) containing a hydroxyl functional group; S4: Under a nitrogen atmosphere, hydroxyethyl methacrylate, lactide, poly (pentadecyl caprolactone) and stannous octoate are added into a reaction vessel, heated to 130-132°C for reaction for 4-4.5 hours, cooled in an ice bath, washed with n-pentane-ethanol solution, and vacuum dried to obtain acrylated poly (lactic acid-pentadecyl caprolactone).
6. The degradable printed tape according to claim 5, characterized in that: During the preparation of pentadecylcyclohexanone, the mass ratio of cardanol to palladium carbon is 4:1; during the heat-insulating and pressure-maintaining reaction, when the pressure drops to 450 psig, it is re-pressurized to 600 psig.
7. The degradable printed tape according to claim 5, characterized in that: In the preparation process of pentadecyl caprolactone, the mass ratio of meta-chloroperbenzoic acid:pentadecylcyclohexanone is 13.9:16.
0.
8. The degradable printed tape according to claim 5, characterized in that: In the preparation process of poly(pentadecyl caprolactone), the molar ratio of pentadecyl caprolactone:1,4-benzenedimethanol:stannous octoate is 2.91:0.15:0.
15.
9. The degradable printed tape according to claim 5, characterized in that: In the preparation process of acrylic acid esterified poly (lactic acid-pentadecyl caprolactone), the molar ratio of hydroxyethyl methacrylate: lactide: poly (pentadecyl caprolactone): stannous octoate is 1: (5-6): (3-4): 0.
1.
10. A method for preparing a degradable printed tape according to any one of claims 1 to 9, characterized in that: The following steps are involved: The pressure-sensitive adhesive is coated on one side of a biaxially oriented polypropylene film with a printed pattern on the surface, and is cross-linked by light to obtain a degradable printed adhesive tape.