Printing adhesive tape with repeated adhesion performance and preparation method thereof

Abstract

The invention discloses a printing adhesive tape with repeated adhesion performance and a preparation method thereof, and relates to the technical field of printing adhesive tapes. The mixed paper is used as a base material layer, one side of the mixed paper is coated with the glue, the other side of the mixed paper is coated with the ink, and the printing adhesive tape with the repeated pasting performance is obtained. The glue is prepared by taking butyl acrylate, acrylic acid, methyl methacrylate, 2-ethylhexyl acrylate, modified rosin-based epoxy resin and modified wood flour as main materials. The rosin-based epoxy resin with excellent mechanical properties is prepared, and then the rosin-based epoxy resin is modified by using tridecafluorooctyltrimethoxysilane, so that the heat resistance and hydrophobicity of the rosin-based epoxy resin are enhanced. The modified rosin-based epoxy resin can react with an epoxy group on the modified wood powder, the compatibility of the modified rosin-based epoxy resin and the epoxy group on the modified wood powder is better, and the dispersity of the modified wood powder is better, so that the repeated adhesion performance of the printing adhesive tape is met, the water resistance and acid and alkali resistance of the adhesive tape can be improved, and the service life is longer.

Description

Technical Field

[0001] The present invention relates to the technical field of printing tapes, and specifically to a printing tape with repeated sticking performance and a preparation method thereof. Background Art

[0002] As an important bonding, fixing and packaging material, tapes have been widely used in various industries. With the diversification of the use environment and functional requirements, the market's performance requirements for tapes are also constantly increasing. Especially in some extreme environments, the bonding performance, waterproofness and corrosion resistance of traditional tapes are difficult to meet the actual application requirements.

[0003] Although tapes can meet certain bonding and fixing requirements, their performance has certain limitations under specific conditions such as high humidity, high acid-base corrosion, and repeated use. For example, in an environment of high temperature, high humidity or strong chemical corrosion, the adhesive force of traditional tapes will be significantly reduced, and even fall off or fail. In addition, once many traditional tapes are attached to an object, it is very difficult to reattach and use them.

[0004] In order to solve the above problems and improve the corrosion resistance and repeated use performance of printing tapes, the present invention provides a printing tape with repeated sticking performance and a preparation method thereof. Summary of the Invention

[0005] The purpose of the present invention is to provide a printing tape with repeated sticking performance and a preparation method thereof to solve the problems raised in the prior art.

[0006] To achieve the above purpose, the present invention provides the following technical solutions: A preparation method of a printing tape with repeated sticking performance, comprising the following steps: Step 1: Take acrylic acid, emulsifier, potassium persulfate, and silane coupling agent, mix them evenly to obtain a mixed material; take methyl methacrylate, butyl acrylate, isooctyl acrylate, and potassium persulfate, mix them evenly, introduce nitrogen, heat up to 80 - 85 °C, stir for 2 - 3 h, dropwise add the mixed material, add modified rosin-based epoxy resin and modified wood powder, and stir evenly to obtain glue; Step 2: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add a photoinitiator, and stir for 5 - 7 min to obtain ink; Step 3: Use the ink to print on one side of the substrate layer, and perform photocuring to obtain a printed layer; then coat the glue on the side of the substrate layer facing away from the printed layer, and cure it to form a pressure-sensitive adhesive layer, thereby obtaining a printing tape with repeated sticking performance.

[0007] More optimally, the preparation method of the modified wood powder is: take epoxy-modified chitosan and acetic acid, heat to 45-50°C, stir for 30-40 minutes, add poplar wood powder, stir for 6-8 hours, wash and dry to obtain modified wood powder.

[0008] More optimally, the preparation method of the epoxy-modified chitosan is: take chitosan and acetic acid, heat to 45-50°C, stir for 30-40 minutes, add dibutyltin dilaurate, stir for 5-8 minutes, then dropwise add cyclohexene oxide, stir for 6-8 hours, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan.

[0009] More optimally, the preparation method of the modified rosin-based epoxy resin comprises the following steps: S1: Take rosin, heat it to 175-180℃, react for 4-6h, add hydroquinone and maleic anhydride, react at 170-175℃ for 4-5h, cool, recrystallize and dry to obtain compound A; take compound A and N,N-dimethylformamide, stir evenly, add toluene and 1,5-naphthalenediamine, react at 85-95℃ for 10-12h, heat it to 120-125℃, react for 10-12h, cool it to 25-30℃, extract, wash with water and dry to obtain compound B; S2: Take epichlorohydrin and compound B, stir evenly under nitrogen protection, add tetramethylammonium chloride, react at 85-90°C for 3-5h, cool to 68-72°C, add sodium hydroxide, react for 3-5h, filter, distill, extract and dry to obtain rosin-based epoxy resin; S3: Take tridecafluorooctyltrimethoxysilane and rosin-based epoxy resin, stir them evenly to obtain modified rosin-based epoxy resin.

[0010] More optimally, the ink comprises the following components, by weight: 300-320 parts of acrylate, 55-65 parts of glycidyl methacrylate, 7-9 parts of carbon black, 2-2.5 parts of modified wood powder, and 30-35 parts of photoinitiator.

[0011] Preferably, the substrate layer is Japanese paper, and the thickness of the Japanese paper is 55-60 μm.

[0012] More optimally, the particle size of the carbon black is 40-60 nm.

[0013] Compared with the prior art, the present invention has the following beneficial effects: 1. The present invention uses Japanese paper as a substrate layer, coats glue on one side of the Japanese paper, and coats ink on the other side, thereby obtaining a printed adhesive tape with repeated pasting performance.

[0014] The invention uses butyl acrylate, acrylic acid, methyl methacrylate, isooctyl acrylate, modified rosin-based epoxy resin and modified wood powder as main ingredients to prepare a glue. Then, cyclohexene oxide is added to modify chitosan, and then the chitosan is loaded on the wood powder to effectively reduce the corrosion of hydrogen ions and hydroxide ions on the adhesive tape. The use of the glue can enhance the corrosion resistance of the adhesive tape.

[0015] 2. The present invention prepares a rosin-based epoxy resin with excellent mechanical properties, and then uses tridecafluorooctyl trimethoxysilane to modify it to enhance its heat resistance and hydrophobicity. In addition, the modified rosin-based epoxy resin can react with the epoxy group on the modified wood powder, and the two have better compatibility and the modified wood powder has better dispersibility. At this time, while satisfying the repeated pasting performance of the printed tape, the water resistance and corrosion resistance of the tape can also be improved, and the service life is longer. DETAILED DESCRIPTION

[0016] 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.

[0017] Carbon black: average particle size is 40 nm; poplar wood powder: 100 mesh, which can be purchased from Lingshou County Jiaao Mineral Products Co., Ltd.; photoinitiator: photoinitiator 819, which can be purchased from Nanjing Milan Chemical; substrate: Japanese paper, thickness is 55 μm.

[0018] Embodiment 1: A method for preparing a printed adhesive tape with repeated sticking performance, comprising the following steps: Step 1: Preparation of epoxy-modified chitosan: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 48 °C, stir for 35 min, add 0.1 g of dibutyltin dilaurate, stir for 6 min, then dropwise add 12 mL of cyclohexene oxide, stir for 7 h, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan; Step 2: Preparation of modified wood powder: Take 2g epoxy-modified chitosan and 100mL acetic acid with a concentration of 1wt%, heat to 48°C, stir for 35min, add 1g poplar wood powder, stir for 7h, wash and dry to obtain modified wood powder; Step 3: Preparation of modified rosin-based epoxy resin: Take 80g of rosin, heat to 178°C, react for 5h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 172°C for 4.5h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 88°C for 11h, heat to 122°C, react for 11h, cool to 28°C, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 88°C for 4h, cool to 70°C, add 7g of sodium hydroxide, react for 4h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Take 15g of tridecafluorooctyltrimethoxysilane and 80g of rosin-based epoxy resin, stir evenly to obtain a modified rosin-based epoxy resin; Step 4: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 82°C, stir it for 2.5 hours, add the mixture dropwise, add 15g of modified rosin-based epoxy resin and 3g of modified wood powder, stir evenly, and obtain glue; Step 5: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 6 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 310 parts of acrylate, 60 parts of glycidyl methacrylate, 8 parts of carbon black, 2.2 parts of modified wood powder, 32 parts of photoinitiator 819; Step 6: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0019] Embodiment 2: A method for preparing a printed adhesive tape with repeated sticking performance, comprising the following steps: Step 1: Preparation of epoxy-modified chitosan: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 45 °C, stir for 30 min, add 0.1 g of dibutyltin dilaurate, stir for 5 min, then dropwise add 12 mL of cyclohexene oxide, stir for 6 h, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan; Step 2: Preparation of modified wood powder: Take 2g epoxy-modified chitosan and 100mL acetic acid with a concentration of 1wt%, heat to 45°C, stir for 30min, add 1g poplar wood powder, stir for 6h, wash and dry to obtain modified wood powder; Step 3: Preparation of modified rosin-based epoxy resin: Take 80g of rosin, heat to 175℃, react for 4h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 170℃ for 4h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 85℃ for 10h, heat to 120℃, react for 10h, cool to 25℃, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 85°C for 3h, cool to 68°C, add 7g of sodium hydroxide, react for 3h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Take 15g of tridecafluorooctyltrimethoxysilane and 80g of rosin-based epoxy resin, stir evenly to obtain a modified rosin-based epoxy resin; Step 4: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 80°C, stir it for 2 hours, add the mixture dropwise, add 15g of modified rosin-based epoxy resin and 3g of modified wood powder, stir evenly, and obtain glue; Step 5: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 5 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 300 parts of acrylate, 55 parts of glycidyl methacrylate, 7 parts of carbon black, 2 parts of modified wood powder, 30 parts of photoinitiator 819; Step 6: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0020] Embodiment 3: A method for preparing a printed adhesive tape with repeated sticking performance, comprising the following steps: Step 1: Preparation of epoxy-modified chitosan: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 50 °C, stir for 40 min, add 0.1 g of dibutyltin dilaurate, stir for 8 min, then dropwise add 12 mL of cyclohexene oxide, stir for 8 h, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan; Step 2: Preparation of modified wood powder: Take 2g epoxy-modified chitosan and 100mL acetic acid with a concentration of 1wt%, heat to 50°C, stir for 40min, add 1g poplar wood powder, stir for 8h, wash and dry to obtain modified wood powder; Step 3: Preparation of modified rosin-based epoxy resin: Take 80g of rosin, heat to 180℃, react for 6h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 175℃ for 5h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 95℃ for 12h, heat to 125℃, react for 12h, cool to 30℃, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 90°C for 5h, cool to 72°C, add 7g of sodium hydroxide, react for 5h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Take 15g of tridecafluorooctyltrimethoxysilane and 80g of rosin-based epoxy resin, stir evenly to obtain a modified rosin-based epoxy resin; Step 4: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 85°C, stir it for 3 hours, add the mixture dropwise, add 15g of modified rosin-based epoxy resin and 3g of modified wood powder, stir evenly, and obtain glue; Step 5: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 7 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 320 parts of acrylate, 65 parts of glycidyl methacrylate, 9 parts of carbon black, 2.5 parts of modified wood powder, 35 parts of photoinitiator 819; Step 6: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0021] Comparative Example 1: Chitosan was modified without adding cyclohexene oxide, and the rest was the same as Example 1: Step 1: Preparation of modified wood powder: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 48 °C, stir for 35 min, add 1 g of poplar wood powder, stir for 7 h, wash and dry to obtain modified wood powder; Step 2: Preparation of modified rosin-based epoxy resin: Take 80g of rosin, heat to 178°C, react for 5h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 172°C for 4.5h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 88°C for 11h, heat to 122°C, react for 11h, cool to 28°C, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 88°C for 4h, cool to 70°C, add 7g of sodium hydroxide, react for 4h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Take 15g of tridecafluorooctyltrimethoxysilane and 80g of rosin-based epoxy resin, stir evenly to obtain a modified rosin-based epoxy resin; Step 3: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 82°C, stir it for 2.5 hours, add the mixture dropwise, add 15g of modified rosin-based epoxy resin and 3g of modified wood powder, stir evenly, and obtain glue; Step 4: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 6 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 310 parts of acrylate, 60 parts of glycidyl methacrylate, 8 parts of carbon black, 2.2 parts of modified wood powder, 32 parts of photoinitiator 819; Step 5: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0022] Comparative Example 2: Tridecafluorooctyltrimethoxysilane was not used for modification, and the rest was the same as Example 1: Step 1: Preparation of epoxy-modified chitosan: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 48 °C, stir for 35 min, add 0.1 g of dibutyltin dilaurate, stir for 6 min, then dropwise add 12 mL of cyclohexene oxide, stir for 7 h, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan; Step 2: Preparation of modified wood powder: Take 2g epoxy-modified chitosan and 100mL acetic acid with a concentration of 1wt%, heat to 48°C, stir for 35min, add 1g poplar wood powder, stir for 7h, wash and dry to obtain modified wood powder; Step 3: Preparation of rosin-based epoxy resin: Take 80g of rosin, heat to 178°C, react for 5h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 172°C for 4.5h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 88°C for 11h, heat to 122°C, react for 11h, cool to 28°C, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 88°C for 4h, cool to 70°C, add 7g of sodium hydroxide, react for 4h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Step 4: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 82°C, stir it for 2.5 hours, add the mixture dropwise, add 15g of rosin-based epoxy resin and 3g of modified wood powder, stir evenly, and obtain glue; Step 5: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 6 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 310 parts of acrylate, 60 parts of glycidyl methacrylate, 8 parts of carbon black, 2.2 parts of modified wood powder, 32 parts of photoinitiator 819; Step 6: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0023] Comparative Example 3: The epoxy-modified chitosan is not loaded on the wood powder, and the rest is the same as Example 1: Step 1: Preparation of epoxy-modified chitosan: Take 2 g of chitosan and 100 mL of 1 wt% acetic acid, heat to 48 °C, stir for 35 min, add 0.1 g of dibutyltin dilaurate, stir for 6 min, then dropwise add 12 mL of cyclohexene oxide, stir for 7 h, rotary evaporate, wash, and freeze-dry to obtain epoxy-modified chitosan; Step 2: Preparation of modified rosin-based epoxy resin: Take 80g of rosin, heat to 178°C, react for 5h, add 0.4g of hydroquinone and 15g of maleic anhydride, react at 172°C for 4.5h, cool, recrystallize and dry to obtain compound A; take 80g of compound A and 300mL of N,N-dimethylformamide, stir evenly, add 100g of toluene and 14.5g of 1,5-naphthalenediamine, react at 88°C for 11h, heat to 122°C, react for 11h, cool to 28°C, extract, wash with water and dry to obtain compound B; Take 40g of epichlorohydrin and 50g of compound B, stir evenly under nitrogen protection, add 0.6g of tetramethylammonium chloride, react at 88°C for 4h, cool to 70°C, add 7g of sodium hydroxide, react for 4h, filter, distill, extract and dry to obtain rosin-based epoxy resin; Take 15g of tridecafluorooctyltrimethoxysilane and 80g of rosin-based epoxy resin, stir evenly to obtain a modified rosin-based epoxy resin; Step 3: Preparation of glue: Take 6g of acrylic acid, 2g of CO-436 emulsifier, 6g of potassium persulfate, and 10g of KH570, mix well to obtain a mixture; Take 12g of methyl methacrylate, 60g of butyl acrylate, 52g of isooctyl acrylate, and 6g of potassium persulfate, mix them evenly, and introduce nitrogen. After introducing nitrogen for 30 minutes, heat it to 82°C, stir it for 2.5 hours, add the mixture dropwise, add 15g of modified rosin-based epoxy resin, 1g of epoxy-modified chitosan, and 2g of poplar wood powder, stir evenly, and obtain glue; Step 4: Preparation of ink: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator 819, stir for 6 minutes, and obtain ink; The ink comprises the following ingredients, by weight: 310 parts of acrylate, 60 parts of glycidyl methacrylate, 8 parts of carbon black, 2.2 parts of modified wood powder, 32 parts of photoinitiator 819; Step 5: Preparation of printed tape with repeated sticking performance: Ink is printed on one side of a 55 μm thick substrate layer and light-cured to obtain a printed layer; glue is then coated on the side of the substrate layer away from the printed layer and cured to form a pressure-sensitive adhesive layer to obtain a printed tape with repeated pasting performance; the thickness of the pressure-sensitive adhesive layer is 25 μm.

[0024] experiment: The printed tapes prepared in Examples 1 to 3 and Comparative Examples 1 to 3 were subjected to performance tests. The 180° peeling force was tested with reference to GB / T2792-2014, and the tape sample size was 300 mm×24 mm. The stickiness was tested with reference to GB / T4851-2014 using stainless steel. The printed tape was placed in a 60°C oven for several hours, taken out, and after returning to 25°C, the glue overflow phenomenon was observed to characterize its high temperature resistance. A 5% sodium chloride solution was used to perform a salt spray resistance test on the printed tape, and the tape was observed to fall off to characterize its corrosion resistance. The obtained data are shown in the following table: Conclusion: From the comparison of the data in the table, it can be seen that in Example 1, epoxycyclohexane is not added to modify chitosan, and the corrosion resistance of the tape decreases. In Example 2, tridecafluorooctyltrimethoxysilane is not used for modification. After the printed tape was placed in a 60°C oven for 8 hours, there was a glue overflow phenomenon, and the tape warped at 10 hours in a salt spray environment. At this time, the high temperature corrosion resistance of the printed tape decreased. In Example 3, epoxy-modified chitosan is not loaded on wood powder, the dispersibility of wood powder is poor, the adhesiveness of the tape decreases, and the high temperature corrosion resistance also decreases. The present invention uses Japanese paper as a substrate layer, applies glue on one side of the Japanese paper, and applies ink on the other side to obtain a printed tape with repeated pasting performance. Adding epoxycyclohexane to modify chitosan and then loading it on wood powder can effectively reduce the erosion of hydrogen ions and hydroxide ions on the tape. Using this glue, the corrosion resistance of the tape can be enhanced.

[0025] 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 method for preparing a printed adhesive tape with repeated pasting performance, characterized in that: The following steps are involved: Step 1: Take acrylic acid, emulsifier, potassium persulfate, and silane coupling agent, mix them evenly to obtain a mixture; take methyl methacrylate, butyl acrylate, isooctyl acrylate, and potassium persulfate, mix them evenly, introduce nitrogen, heat to 80-85°C, stir for 2-3h, drop the mixture, add modified rosin-based epoxy resin and modified wood powder, stir evenly, and obtain glue; Step 2: Take acrylate and glycidyl methacrylate, mix them evenly, then add carbon black and modified wood powder, mix them evenly, then add photoinitiator, stir for 5-7 minutes, and obtain ink; Step 3: Printing ink on one side of the substrate layer and light curing to obtain a printed layer; Then the glue is coated on the side of the substrate layer away from the printing layer, and cured to form a pressure-sensitive adhesive layer, thereby obtaining a printed adhesive tape with repeated pasting performance.

2. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 1, characterized in that: The preparation method of the modified wood powder is as follows: taking epoxy modified chitosan and acetic acid, heating to 45-50° C., stirring for 30-40 minutes, adding poplar wood powder, stirring for 6-8 hours, washing and drying to obtain the modified wood powder.

3. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 2, characterized in that: The preparation method of the epoxy-modified chitosan is as follows: taking chitosan and acetic acid, heating to 45-50° C., stirring for 30-40 minutes, adding dibutyltin dilaurate, stirring for 5-8 minutes, then dropping cyclohexene oxide, stirring for 6-8 hours, rotary evaporation, washing, and freeze drying to obtain the epoxy-modified chitosan.

4. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 1, characterized in that: The preparation method of modified rosin-based epoxy resin is as follows: The following steps are involved: S1: Take rosin, heat it to 175-180℃, react for 4-6h, add hydroquinone and maleic anhydride, react at 170-175℃ for 4-5h, cool, recrystallize and dry to obtain compound A; take compound A and N,N-dimethylformamide, stir evenly, add toluene and 1,5-naphthalenediamine, react at 85-95℃ for 10-12h, heat it to 120-125℃, react for 10-12h, cool it to 25-30℃, extract, wash with water and dry to obtain compound B; S2: Take epichlorohydrin and compound B, stir evenly under nitrogen protection, add tetramethylammonium chloride, react at 85-90°C for 3-5h, cool to 68-72°C, add sodium hydroxide, react for 3-5h, filter, distill, extract and dry to obtain rosin-based epoxy resin; S3: Take tridecafluorooctyltrimethoxysilane and rosin-based epoxy resin, stir them evenly to obtain modified rosin-based epoxy resin.

5. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 1, characterized in that: The ink comprises the following components, by weight: 300-320 parts of acrylate, 55-65 parts of glycidyl methacrylate, 7-9 parts of carbon black, 2-2.5 parts of modified wood powder, and 30-35 parts of photoinitiator.

6. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 1, characterized in that: The substrate layer is Japanese paper, and the thickness of the Japanese paper is 55-60 μm.

7. The method for preparing a printed adhesive tape with repeated sticking performance according to claim 5, characterized in that: The particle size of the carbon black is 40-60 nm.

8. A printed tape prepared according to the method for preparing a printed tape with repeated sticking performance according to any one of claims 1 to 7.

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