A method for manufacturing reclaimed and reconstituted adhesive paper from corrugated cardboard boxes and its applications.

Abstract

This invention discloses a method for manufacturing reclaimed adhesive paper from corrugated cardboard boxes, its application, and its specific application in the field of environmentally friendly materials technology. The reclaimed adhesive paper is prepared from short-fiber pulp, cellulase complex, Leuconostoc membranaceus, long-fiber pulp, chitin nanofiber suspension, gum arabic, rosin glycerol ester, and tributyl citrate. By using only waste corrugated cardboard boxes as raw materials and employing bio-enzymatic mild separation technology, this invention effectively avoids the severe damage to fibers caused by traditional high-strength mechanical pulping, successfully obtaining high-strength, high-surface-integrity, high-quality recycled fibers, thus achieving the goal of resource regeneration.

Description

Technical Field

[0001] This invention relates to the field of environmentally friendly materials technology, and more specifically, to a method for manufacturing reclaimed corrugated cardboard paper, its application, and its use. Background Technology

[0002] Corrugated cardboard boxes, as a widely used packaging material, have advantages such as light weight, high strength, low cost, and easy recycling, and are used extensively in logistics, transportation, and warehousing industries. With the booming development of e-commerce, the demand for corrugated cardboard boxes has been increasing year by year, and the number of waste corrugated cardboard boxes generated has also increased dramatically. Adhesive paper, due to its convenient peel-and-stick properties, is widely used in office records, logistics labeling, and home management. Therefore, how to make full use of waste corrugated cardboard box resources and produce high-performance, low-cost recycled paper with adhesive functions through reasonable processing has become an urgent problem to be solved by those skilled in the art.

[0003] The adhesive paper in related technologies includes a face stock, an adhesive, and a backing paper. The face stock is mainly made of coated paper made from virgin wood pulp. Its function is to carry the printed content and provide basic physical strength, as well as mechanical strength and printability. The adhesive is mostly acrylic resin, which achieves adhesion through intermolecular forces. It has high initial tack but poor temperature resistance, giving the product adhesion properties. The backing paper is silicone-coated release paper, which is used to protect the adhesive surface and ensure that the face stock can be easily peeled off during use.

[0004] However, it still has some drawbacks in practical use. For example, it relies on virgin wood pulp. Traditional recycled paper raw materials are mixed with short fiber waste, and the deinking process excessively damages the fiber structure, resulting in a serious lack of strength in the substrate. It must rely on virgin wood pulp for reinforcement to meet mechanical performance requirements. The adhesive layer has poor compatibility. The surface of recycled fibers is highly hydrophobic and contains residual chemical agents, making it difficult for the adhesive to effectively wet and spread. The interfacial bonding is weak and easy to debond, forcing the use of highly polluting solvent-based adhesives. The fibers are severely damaged. The rough mechanical pulping and strong chemical deinking process of traditional recycled paper cuts off a large number of fibers and destroys molecular chains, resulting in a sharp reduction in fiber length and deterioration of bonding ability, making the base paper brittle and lacking toughness. Summary of the Invention

[0005] To improve the above-mentioned problems and reduce the issues of adhesive paper relying on virgin wood pulp, poor adhesive compatibility, and severe fiber damage in related technologies, this invention provides an adhesive paper made from recycled corrugated cardboard, a manufacturing method, and an application to solve the problems mentioned in the background art.

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

[0007] A method for manufacturing reclaimed and reconstituted adhesive paper from corrugated cardboard boxes and its application includes the following steps:

[0008] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at a temperature of 45-55℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at a temperature of 20-30℃ and an oxygen partial pressure of less than 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0009] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 30-50 minutes at a temperature of 40-50℃ and a stirring speed of 40-60r / min to obtain the modified long fiber slurry.

[0010] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0011] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate are melt-blended in a water bath at 60-80℃ and 700-900r / min for 50-70 minutes to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive is applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20g / m² using a roller coater and dried in hot air at 75℃ for 5 minutes. Then it is laminated with release paper treated with silicone oil, cured for 24 hours, and then cut to obtain reclaimed adhesive paper for corrugated cardboard boxes.

[0012] Preferably, the raw materials for preparing the reclaimed and reconstituted adhesive paper from corrugated cardboard boxes, and their respective weight proportions, are as follows: 100 parts of short fiber slurry, 1.8-2.5 parts of cellulase complex, 1.67-2.22 parts of Leuconostoc membranaceus, 100 parts of long fiber slurry, 1.2-1.6 parts of chitin nanofiber suspension, 54-72 parts of gum arabic, 9-12 parts of rosin glycerol ester, and 1.8-2.4 parts of tributyl citrate.

[0013] Preferably, both the short fiber component slurry and the long fiber component slurry are recycled corrugated cardboard box slurries.

[0014] Preferably, the method for preparing the recycled corrugated cardboard pulp includes the following steps:

[0015] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 80-90℃ for 40-50min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 45-55℃ and 55-65r / min for 80-100min; after the reaction, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0016] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at a temperature of 40-50℃ and a pH of 5.0 for 50-70 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, while the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp.

[0017] Preferably, the raw materials for preparing the recycled corrugated cardboard pulp are as follows: 1 part waste corrugated cardboard box, 0.6-1.0 part sodium carbonate solution, 7.5-10 parts phosphate buffer solution, 0.008-0.01 parts compound biological enzyme preparation, and 0.005-0.0075 parts pectinase.

[0018] Preferably, the sodium carbonate solution is an 8% sodium carbonate solution by mass.

[0019] The phosphate buffer solution was a 0.05 mol / L, pH 6.0 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution.

[0020] The compound biological enzyme preparation is composed of endoglucanase, xylanase and laccase in an activity ratio of 5:3:2.

[0021] Preferably, the citric acid-sodium citrate buffer system is a 0.1 mol / L citric acid-sodium citrate buffer system.

[0022] The cellulase complex consists of endoglucanase, exoglucanase, β-glucosidase, and xylanase in an activity ratio of 5:3:1.5:2.

[0023] The chitin nanofiber suspension was prepared by pretreating α-chitin with a degree of deacetylation ≤10%, then partially hydrolyzing it with 2.5 mol / L hydrochloric acid at 60℃ for 4 hours, and then cyclically processing it 15 times under 120 MPa pressure using a high-pressure homogenizer.

[0024] This invention uses waste corrugated cardboard boxes as raw materials and employs bio-enzymatic mild separation technology to effectively avoid the serious damage to fibers caused by traditional high-strength mechanical pulping, successfully obtaining high-strength, high-quality recycled fibers with good surface integrity, thus achieving the goal of resource recycling.

[0025] This invention transforms low-value short fibers into high-performance microbial extracellular polysaccharide adhesives through enzymatic saccharification and microbial fermentation technology. When this adhesive is compounded with bio-based additives, it can form a pressure-sensitive adhesive layer with excellent chemical compatibility with regenerated fiber substrates, resulting in a strong, residue-free adhesive with excellent re-peelability. This solves the problem of poor compatibility between traditional petroleum-based adhesive layers and regenerated substrates.

[0026] This invention achieves the goal of reducing fiber damage by using low-temperature pretreatment and the synergistic effect of biological enzymes to avoid the severe damage to fibers caused by traditional chemical treatments, while preserving fiber length and structural integrity. Detailed Implementation

[0027] The present invention will be further described in detail below with reference to the embodiments of the present invention. Unless otherwise specified below, the raw materials used in the various examples and embodiments of the present invention are all commercially available common materials.

[0028] Preparation Examples 1-5

[0029] A type of recycled pulp for corrugated cardboard boxes, the components of which and their corresponding proportions are shown in the table below, is prepared using the following method:

[0030] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 85℃ for 45min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 50℃ and 60r / min for 90min; after the reaction is completed, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0031] The sodium carbonate solution is an 8% sodium carbonate solution by mass.

[0032] The phosphate buffer solution was a 0.05 mol / L, pH 6.0 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution.

[0033] The compound biological enzyme preparation is composed of endoglucanase, xylanase and laccase in an activity ratio of 5:3:2;

[0034] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at 45℃ and pH 5.0 for 60 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, and the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp. Both are recycled pulp from corrugated cardboard boxes.

[0035] Table: Components and their mass ratios (kg) of the raw materials used in Preparation Examples 1-5

[0036]

[0037] Preparation Example 6

[0038] A recycled pulp for corrugated cardboard boxes, which differs from Preparation Example 1 in that its preparation method is as follows:

[0039] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 80℃ for 40min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 45℃ and 55r / min for 80min; after the reaction, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0040] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at 45℃ and pH 5.0 for 60 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, and the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp. Both are recycled pulp from corrugated cardboard boxes.

[0041] Preparation Example 7

[0042] A recycled pulp for corrugated cardboard boxes, which differs from Preparation Example 1 in that its preparation method is as follows:

[0043] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 90℃ for 50min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 55℃ and 65r / min for 100min; after the reaction, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0044] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at 45℃ and pH 5.0 for 60 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, and the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp. Both are recycled pulp from corrugated cardboard boxes.

[0045] Preparation Example 8

[0046] A recycled pulp for corrugated cardboard boxes, which differs from Preparation Example 1 in that its preparation method is as follows:

[0047] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 85℃ for 45min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 50℃ and 60r / min for 90min; after the reaction is completed, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0048] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at 40℃ and pH 5.0 for 50 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, and the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp. Both are recycled pulp from corrugated cardboard boxes.

[0049] Preparation Example 9

[0050] A recycled pulp for corrugated cardboard boxes, which differs from Preparation Example 1 in that its preparation method is as follows:

[0051] C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 85℃ for 45min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 50℃ and 60r / min for 90min; after the reaction is completed, use a vortex separator to remove light impurities to obtain pure primary pulp;

[0052] C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at 50℃ and pH 5.0 for 70 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, and the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp. Both are recycled pulp from corrugated cardboard boxes.

[0053] Preparation Examples 10-14

[0054] A type of recyclable paper for corrugated cardboard boxes is prepared using the following method: The components and their proportions are shown in the table below.

[0055] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 50℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 25℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0056] The citrate-sodium citrate buffer system is specifically a 0.1 mol / L citrate-sodium citrate buffer system;

[0057] The cellulase complex consists of endoglucanase, exoglucanase, β-glucosidase, and xylanase in an activity ratio of 5:3:1.5:2.

[0058] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 40 min at a temperature of 45℃ and a stirring speed of 50 r / min to obtain the modified long fiber slurry.

[0059] The chitin nanofiber suspension was prepared by pretreating α-chitin with a degree of deacetylation ≤10%, then partially hydrolyzing it with 2.5 mol / L hydrochloric acid at 60℃ for 4 hours, and then cyclically treating it 15 times under 120 MPa pressure using a high-pressure homogenizer.

[0060] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0061] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 70°C and 800 r / min for 60 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0062] Table: Components and their mass ratios (kg) of the raw materials used in Preparation Examples 10-14

[0063]

[0064] Preparation Example 15

[0065] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0066] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 45℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 20℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0067] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 40 min at a temperature of 45℃ and a stirring speed of 50 r / min to obtain the modified long fiber slurry.

[0068] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0069] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 70°C and 800 r / min for 60 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0070] Preparation Example 16

[0071] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0072] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 55℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 30℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0073] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 40 min at a temperature of 45℃ and a stirring speed of 50 r / min to obtain the modified long fiber slurry.

[0074] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0075] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 70°C and 800 r / min for 60 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0076] Preparation Example 17

[0077] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0078] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 50℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 25℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0079] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 30 minutes at a temperature of 40℃ and a stirring speed of 40r / min to obtain the modified long fiber slurry.

[0080] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0081] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 70°C and 800 r / min for 60 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0082] Preparation Example 18

[0083] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0084] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 50℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 25℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0085] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 50 min at a temperature of 50℃ and a stirring speed of 60 r / min to obtain the modified long fiber slurry.

[0086] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0087] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 70°C and 800 r / min for 60 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0088] Preparation Example 19

[0089] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0090] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 50℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 25℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0091] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 40 min at a temperature of 45℃ and a stirring speed of 50 r / min to obtain the modified long fiber slurry.

[0092] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0093] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 60°C and 700 r / min for 50 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in a hot air condition at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0094] Preparation Example 20

[0095] A type of adhesive paper made from recycled corrugated cardboard boxes, which differs from Preparation Example 10 in that its preparation method is as follows:

[0096] A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at 50℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at 25℃ and oxygen partial pressure below 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel.

[0097] A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 40 min at a temperature of 45℃ and a stirring speed of 50 r / min to obtain the modified long fiber slurry.

[0098] A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper.

[0099] A4. Gum arabic, rosin glycerol ester, the microbial extracellular polysaccharide solution obtained in A1, and tributyl citrate were melt-blended in a water bath at 80°C and 900 r / min for 70 min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive was applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20 g / m² using a roller coater and dried in hot air at 75°C for 5 min. Then it was laminated with release paper treated with silicone oil, cured for 24 h, and then cut to obtain reclaimed corrugated cardboard paper.

[0100] Preparation Examples 21-28

[0101] A type of reclaimed corrugated cardboard paper differs from Preparation Example 10 in that the use of recycled corrugated cardboard pulp in its components is different, as shown in the table below.

[0102] Table: Comparison of the usage of recycled pulp for corrugated cardboard boxes in Preparation Examples 21-28

[0103]

[0104] Performance testing

[0105] The reconstituted adhesive paper from recycled corrugated cardboard boxes prepared in each embodiment was selected for testing. The test subjects were 190 samples of reconstituted adhesive paper from recycled corrugated cardboard boxes, with 10 samples in each group. Its safety, drug resistance, and antibacterial spectrum were tested. The specific testing steps are as follows:

[0106] Fiber properties:

[0107] First, samples were taken from the corrugated cardboard boxes prepared in the examples during the process of remanufacturing the adhesive paper. A fiber quality analyzer was used to test the average fiber length and the proportion of long fibers (i.e., the proportion of fibers with a length greater than 1 mm), thereby characterizing the fiber properties of the remanufacturable corrugated cardboard box. The test results and evaluation criteria are as follows:

[0108] Average fiber length ≥ 0.8 mm, long fiber percentage ≥ 60% (considered good fiber performance);

[0109] Average fiber length < 0.8 mm, long fiber percentage < 60% (considered as poor fiber performance).

[0110] Adhesive layer properties:

[0111] First, samples of the reclaimed corrugated cardboard paper prepared in the examples were taken. A 180° peel test was conducted according to the "Test Method for Peel Strength of Adhesive Tape" to test the peel force between the adhesive layer and the paper substrate, thereby characterizing the adhesive layer performance of the reclaimed corrugated cardboard paper. The test results and evaluation criteria are as follows:

[0112] Peel strength ≥ 0.8 N / mm (considered as strong adhesive layer performance);

[0113] 0.8 N / mm < peel strength < 0.5 N / mm (considered as weak adhesive layer performance)

[0114] Peel strength ≤ 0.5 N / mm (considered as poor adhesive layer performance).

[0115] It should be specifically noted that the reclaimed corrugated cardboard paper obtained above is produced in accordance with normal production methods. Any defective reclaimed corrugated cardboard paper produced will be discarded.

[0116] Examples 1-5

[0117] The corresponding relationship of the preparation methods used in the recycling and reprocessing of corrugated cardboard boxes into adhesive paper is shown in the table below.

[0118] Table: Comparison of the use of reclaimed adhesive paper from corrugated cardboard boxes in Examples 1-5

[0119]

[0120] Extract reclaimed adhesive paper from corrugated cardboard boxes in Examples 1-5 above, and test its average fiber length, long fiber ratio, and peel strength according to the above measurement steps and standards. The average value of the test results is recorded in the table below.

[0121] Table: Performance test results of average fiber length, long fiber percentage, and peel strength in Examples 1-5

[0122]

[0123] As can be seen from the table above, the corrugated cardboard recycled and reconstituted adhesive paper preparation processes in Examples 1-5 all effectively improve the production efficiency of corrugated cardboard recycled and reconstituted adhesive paper. Using waste corrugated cardboard as the core raw material, replacing virgin wood pulp, resource recycling is achieved through biomass energy conversion technology. Sodium carbonate solution is used for pretreatment to soften the fibers and partially remove lignin and ink impurities. The phosphate buffer system provides a stable catalytic environment for the composite bio-enzyme preparation. This enzyme preparation gently separates the fibers through the synergistic action of endoglucanase, xylanase, and laccase, greatly reducing fiber damage caused by traditional mechanical pulping. Pectinase further purifies the fiber surface, facilitating subsequent bonding. Short fiber components are processed through fiber... After saccharification, the vitamin C complex is fermented by Leuconostoc membranaceus into a microbial extracellular polysaccharide solution, which has both adhesive and reinforcing functions. This solution, together with chitin nanofiber suspension, acts on the long fiber component, significantly enhancing the inter-fiber bonding force through hydrogen bonding and entanglement effects between biopolymers, thus constructing a high-strength substrate. Gum arabic, as a bio-sizing agent, improves the surface properties of the substrate and is compounded with rosin glycerol ester and the aforementioned microbial solution to form a bio-based pressure-sensitive adhesive. It has excellent chemical compatibility with the regenerated fiber substrate, fundamentally solving the problem of adhesive layer compatibility. Tributyl citrate, as a plasticizer, optimizes the flexibility of the adhesive layer, thereby achieving the goal of improving the production effect of recycled corrugated cardboard boxes into adhesive paper.

[0124] Its average fiber length is 0.80-0.92mm, and the proportion of long fibers is 60.9-68.1%, which is considered to be good fiber performance; the peel strength is 0.82-0.98N / mm, which is considered to be strong adhesive layer performance;

[0125] It is evident that, given a fixed amount of raw materials, the production efficiency of reconstituted corrugated cardboard paper can be increased by adjusting the proportions of these materials. Based on the data in the table above, it is clear that the reconstituted corrugated cardboard paper prepared using 100 parts short fiber slurry, 2 parts cellulase complex, 1.67 parts Leuconostoc membranaceus, 100 parts long fiber slurry, 1.6 parts chitin nanofiber suspension, 72 parts gum arabic, 12 parts rosin glycerol ester, and 2.4 parts tributyl citrate exhibits the strongest fiber and adhesive properties. This is likely due to the use of a higher proportion of beneficial bacterial strains. Under the same substrate conditions, more microbial polysaccharides can be generated. These polysaccharides can form a tighter cross-linked network with long fibers and chitin nanofibers during the pulp reinforcement stage, thereby improving the bonding force between fibers, reducing fiber damage, and thus strengthening fiber performance. At the same time, the excess polysaccharides form a more compatible system with gum arabic, rosin glycerol ester, and tributyl citrate in the preparation of the adhesive layer. The viscosity of gum arabic, the adhesion and water resistance of rosin glycerol ester, and the plasticizing effect of tributyl citrate are more fully utilized under the coordination of polysaccharides, so that the viscosity, flexibility and stability of the adhesive layer are improved, and finally the fiber performance and adhesive layer performance are simultaneously enhanced, as obtained from Examples 1-5.

[0126] Examples 6-11

[0127] The corresponding relationship of the preparation methods used in the recycling and reprocessing of corrugated cardboard boxes into adhesive paper is shown in the table below.

[0128] Table: Comparison of the use of reclaimed adhesive paper from corrugated cardboard boxes in Examples 6-11

[0129]

[0130] Extract the reclaimed adhesive paper from the corrugated cardboard boxes in Examples 6-11 above, and test its average fiber length, long fiber ratio, and peel strength according to the above measurement steps and standards. The average value of the test results is recorded in the table below.

[0131] Table: Performance test results of average fiber length, long fiber percentage, and peel strength in Examples 1, 6-11

[0132]

[0133] As can be seen from the table above, the preparation processes of recycled corrugated cardboard paper in Examples 1 and 6-11 all effectively improve the production efficiency of recycled corrugated cardboard paper. Using waste corrugated cardboard as the core raw material to replace virgin wood pulp, resource recycling is achieved through biomass energy conversion technology. Sodium carbonate solution is used for pretreatment to soften the fibers and partially remove lignin and ink impurities. The phosphate buffer system provides a stable catalytic environment for the composite bio-enzyme preparation. This enzyme preparation gently separates the fibers through the synergistic action of endonuclease, xylanase, and laccase, greatly reducing fiber damage caused by traditional mechanical pulping. Pectinase further purifies the fiber surface, facilitating subsequent bonding. Short fiber components... After saccharification by cellulase complex, the product is fermented by Leuconostoc membranaceus into a microbial extracellular polysaccharide solution, which possesses both adhesive and reinforcing functions. This solution, together with chitin nanofiber suspension, acts on the long fiber component, significantly enhancing the inter-fiber bonding force through hydrogen bonding and entanglement effects between biopolymers, thus constructing a high-strength substrate. Gum arabic, as a bio-sizing agent, improves the surface properties of the substrate and is compounded with rosin glycerol ester and the aforementioned microbial solution to form a bio-based pressure-sensitive adhesive. This adhesive exhibits excellent chemical compatibility with the regenerated fiber substrate, fundamentally solving the problem of adhesive layer compatibility. Tributyl citrate, as a plasticizer, optimizes the flexibility of the adhesive layer, thereby achieving the goal of improving the production efficiency of reclaimed corrugated cardboard boxes into adhesive paper.

[0134] Its average fiber length is 0.81-0.87 mm, and the proportion of long fibers is 63.7-64.3%, which is considered to be good fiber performance; the peel strength is 0.82-0.90 N / mm, which is considered to be strong adhesive layer performance;

[0135] It is evident that, given a fixed amount of raw materials, the production efficiency of reclaimed corrugated cardboard paper can be increased by adjusting the preparation conditions. Based on the data in the table above, it is clear that the best results in preparing microbial extracellular polysaccharide solutions were achieved under the following conditions: enzymatic hydrolysis at 50℃ and fermentation at 25℃; mixing and modification of modified long-fiber slurry at 45℃ and 50 r / min for 40 minutes; and melt blending at 70℃ and 800 r / min in a water bath for 60 minutes. The resulting reclaimed corrugated cardboard paper exhibited the strongest fiber and adhesive properties. This is because the 50℃ enzymatic hydrolysis environment significantly activated the cellulase complex, ensuring efficient and thorough saccharification of the short fibers, providing ample high-quality substrate for subsequent fermentation. The 25℃ fermentation condition perfectly matched the optimal growth and metabolic state of *Leuconostoc membranaceus*, enabling it to synthesize molecular... The microbial extracellular polysaccharide has a higher content and better viscoelasticity. The long fibers were modified at 45°C and a rotation speed of 50 r / min. This gentle mechanical shear force promoted the uniform dispersion and penetration of chitin nanofibers and microbial extracellular polysaccharide solution between the fibers. The sufficient 40-minute reaction time ensured the formation of a stable hydrogen bond network and entanglement structure between the biopolymer and the active sites on the fiber surface, thus significantly enhancing the mechanical strength of the substrate. Finally, the substrate was melt-blended at 800 r / min for 60 minutes in a 70°C water bath. This condition was sufficient for gum arabic, rosin glycerol ester, and microbial extracellular polysaccharide solution to fully diffuse, intertwine, and form a uniform and stable three-dimensional network structure. Simultaneously, the tributyl citrate plasticizer completely penetrated and softened the colloid. The resulting bio-based pressure-sensitive adhesive not only has strong cohesion but also forms an extremely strong interfacial bond with the regenerated fiber substrate, thus simultaneously achieving excellent fiber performance and adhesive layer performance, as obtained in Examples 1 and 6-11.

[0136] Examples 12-15

[0137] The corresponding relationship of the preparation methods used in the recycling and reprocessing of corrugated cardboard boxes into adhesive paper is shown in the table below.

[0138] Table: Comparison of the use of reclaimed adhesive paper from corrugated cardboard boxes in Examples 12-15

[0139]

[0140] Extract the reclaimed adhesive paper from the corrugated cardboard boxes in Examples 12-15 above, and test its average fiber length, long fiber ratio, and peel strength according to the above measurement steps and standards. The average value of the test results is recorded in the table below.

[0141] Table: Performance test results of average fiber length, long fiber percentage, and peel strength in Examples 1, 12-15

[0142]

[0143] As can be seen from the table above, the preparation process of reclaimed corrugated cardboard paper in Examples 1 and 12-15 all effectively improves the production efficiency of reclaimed corrugated cardboard paper. Using waste corrugated cardboard as the core raw material to replace virgin wood pulp, resource recycling is achieved through biomass energy conversion technology. Sodium carbonate solution is used for pretreatment to soften the fibers and partially remove lignin and ink impurities. The phosphate buffer system provides a stable catalytic environment for the composite bio-enzyme preparation. This enzyme preparation gently separates the fibers through the synergistic action of endonuclease, xylanase, and laccase, greatly reducing fiber damage caused by traditional mechanical pulping. Pectinase further purifies the fiber surface, facilitating subsequent bonding. Short fiber components... After saccharification by cellulase complex, the product is fermented by Leuconostoc membranaceus into a microbial extracellular polysaccharide solution, which possesses both adhesive and reinforcing functions. This solution, together with chitin nanofiber suspension, acts on the long fiber component, significantly enhancing the inter-fiber bonding force through hydrogen bonding and entanglement effects between biopolymers, thus constructing a high-strength substrate. Gum arabic, as a bio-sizing agent, improves the surface properties of the substrate and is compounded with rosin glycerol ester and the aforementioned microbial solution to form a bio-based pressure-sensitive adhesive. This adhesive exhibits excellent chemical compatibility with the regenerated fiber substrate, fundamentally solving the problem of adhesive layer compatibility. Tributyl citrate, as a plasticizer, optimizes the flexibility of the adhesive layer, thereby achieving the goal of improving the production efficiency of reclaimed corrugated cardboard boxes into adhesive paper.

[0144] Its average fiber length is 0.85-0.91 mm, and the proportion of long fibers is 64.1-65.1%, which is considered to be good fiber performance; the peel strength is 0.86-0.97 N / mm, which is considered to be strong adhesive layer performance;

[0145] It is evident that with a fixed amount of raw materials, the production efficiency of reconstituted corrugated cardboard paper can be increased by adjusting the proportions of the raw materials. Based on the data in the table above, it is clear that when preparing the corrugated cardboard pulp, using 1 part waste corrugated cardboard, 0.6 parts sodium carbonate solution, 10 parts phosphate buffer solution, 0.015 parts compound bio-enzyme preparation, and 0.0075 parts pectinase, the resulting reconstituted corrugated cardboard paper exhibits the strongest fiber and adhesive properties. This is because the lower amount of sodium carbonate effectively reduces the degradation damage to cellulose caused by strong alkali, better preserving the natural length and strength of the fibers, while the higher amount of compound bio-enzyme preparation... Pectinase, through its highly efficient biocatalytic action, deeply cleans the fiber surface and removes impurities, providing high-quality fibers with intact structure and pure surface for subsequent processing. At the same time, sufficient enzyme preparation ensures that the short fiber components are fully saccharified to provide abundant substrates for fermentation, thereby generating a large amount of high molecular weight extracellular polysaccharide gel through microbial metabolism. This gel has both excellent adhesion and reinforcing properties. When it is used to modify long fibers, it can significantly promote the bonding between fibers and build a high-strength network skeleton. As a key component of pressure-sensitive adhesive, it forms a perfectly compatible interface with the substrate, ultimately synergistically creating excellent fiber strength and adhesive bonding performance, as obtained in Examples 1 and 12-15.

[0146] Examples 16-19

[0147] The corresponding relationship of the preparation methods used in the recycling and reprocessing of corrugated cardboard boxes into adhesive paper is shown in the table below.

[0148] Table: Comparison of the use of reclaimed adhesive paper from corrugated cardboard boxes in Examples 16-19

[0149]

[0150] Extract the corrugated cardboard recycled and reconstituted adhesive paper from Examples 16-19 above, and test its average stimulus response score, MIC growth fold, and number of microorganisms that achieve "effective inhibition" according to the above measurement steps and standards. The average value of the test results is recorded in the table below.

[0151] Table: Performance test results of average fiber length, long fiber percentage, and peel strength in Examples 1, 16-19

[0152]

[0153] As can be seen from the table above, the preparation processes of recycled corrugated cardboard paper in Examples 1 and 16-19 all effectively improve the production efficiency of recycled corrugated cardboard paper. Using waste corrugated cardboard as the core raw material to replace virgin wood pulp, resource recycling is achieved through biomass energy conversion technology. Sodium carbonate solution is used for pretreatment to soften the fibers and partially remove lignin and ink impurities. The phosphate buffer system provides a stable catalytic environment for the composite bio-enzyme preparation. This enzyme preparation gently separates the fibers through the synergistic action of endonuclease, xylanase, and laccase, greatly reducing fiber damage caused by traditional mechanical pulping. Pectinase further purifies the fiber surface, facilitating subsequent bonding. Short fiber components... After saccharification by cellulase complex, the product is fermented by Leuconostoc membranaceus into a microbial extracellular polysaccharide solution, which possesses both adhesive and reinforcing functions. This solution, together with chitin nanofiber suspension, acts on the long fiber component, significantly enhancing the inter-fiber bonding force through hydrogen bonding and entanglement effects between biopolymers, thus constructing a high-strength substrate. Gum arabic, as a bio-sizing agent, improves the surface properties of the substrate and is compounded with rosin glycerol ester and the aforementioned microbial solution to form a bio-based pressure-sensitive adhesive. This adhesive exhibits excellent chemical compatibility with the regenerated fiber substrate, fundamentally solving the problem of adhesive layer compatibility. Tributyl citrate, as a plasticizer, optimizes the flexibility of the adhesive layer, thereby achieving the goal of improving the production efficiency of reclaimed corrugated cardboard boxes into adhesive paper.

[0154] Its average fiber length is 0.82-0.87 mm, and the proportion of long fibers is 63.5-64.3%, which is considered to be good fiber performance; the peel strength is 0.85-0.90 N / mm, which is considered to be strong adhesive layer performance;

[0155] It is evident that, given a fixed amount of raw materials, the production efficiency of reclaimed corrugated cardboard paper can be increased by adjusting the preparation conditions. Based on the data in the table above, it is clear that when preparing primary pulp, pretreatment at 85℃ for 45 minutes followed by enzymatic hydrolysis at 50℃ and 60 r / min for 90 minutes results in the strongest fiber and adhesive properties for reclaimed corrugated cardboard paper. This is because the 85℃ pretreatment temperature moderately softens the corrugated cardboard fiber structure, aiding in the removal of lignin and ink without excessively damaging fiber integrity; the 45-minute pretreatment time ensures sufficient but not excessive pretreatment; the 50℃ enzymatic hydrolysis temperature matches the activity requirements of the composite enzyme, enabling efficient decomposition of interfiber bonding substances; the 60 r / min rotation speed promotes uniform contact between the enzyme and fiber without triggering severe shearing that could lead to fiber breakage; and the 90℃... The minimum enzymatic hydrolysis time ensures gentle fiber separation, preserving the original length and structure. The reaction temperature of 45°C during the preparation of recycled pulp is suitable for pectinase activity, and the reaction time of 60 min allows pectinase to fully remove residual impurities on the fiber surface and improve fiber surface activity. This synergistic effect of pretreatment, enzymatic hydrolysis, and refining conditions reduces fiber damage and preserves its structural integrity, while also improving fiber surface activity and enhancing fiber performance. At the same time, the more active fiber surface can form a tighter bond with the gum layer, thereby improving the gum layer performance. Ultimately, both are simultaneously optimized, as obtained from Examples 1 and 16-19.

[0156] As one application of this invention, reusable packaging sealing stickers can be used to seal various types of cardboard packaging. They can be directly pasted onto the box opening for multiple openings and closings, or placed inside the packaging box for storage with the product. The surface of the sealing sticker can be printed with brand logos or anti-counterfeiting patterns according to the merchant's needs. During logistics turnover, because the sealing sticker of this invention has stable adhesion and can be reused, the same packaging can maintain its sealing effect after multiple openings and closings, thereby reducing the one-time consumption of traditional tape and lowering packaging costs. Sealing stickers of different thicknesses can be selected according to the characteristics of the transported goods, meeting both the robust requirements of heavy-duty packaging and the convenience of lightweight packaging. Simultaneously, the use of recycled corrugated cardboard boxes achieves the recycling of packaging materials.

[0157] As one application of this invention, stationery sticky notes can be used in office or study settings. They can be repeatedly pasted onto the surface of documents and books, or stored together in a sticky note box. The size and color of the sticky notes can be customized according to user needs to meet personalized recording requirements. In daily use, because the sticky notes of this invention use a recycled fiber substrate and the adhesive layer is reusable, they maintain their stickiness after multiple uses without damaging the surface, thus facilitating temporary annotation and repeated modification of information. They can be categorized and arranged according to usage scenarios, such as yellow for meeting minutes and colored for study notes, improving organization efficiency and reducing the environmental impact of chemical adhesives through the use of a fully biomass adhesive layer.

[0158] As one application of this invention, decorative stickers can be used for decorating home or commercial spaces. They can be quickly applied to walls and furniture surfaces and stored in a sticker book for easy replacement. The patterns on these decorative stickers can be customized to match various styles, such as modern minimalist and retro. During the decoration process, because the stickers of this invention are removable and leave no residue after peeling, the patterns can be changed at any time without damaging the base surface, thus meeting the flexible needs of personalized decoration. They can be pasted in an orderly manner according to spatial areas, such as cartoon patterns for children's rooms and landscape patterns for living rooms, maximizing the diversity and convenience of decoration. At the same time, the combination of recycled corrugated cardboard materials and bio-adhesive layers achieves the environmental protection and sustainability of decorative materials.

[0159] This specific embodiment is merely an explanation of the present invention and not a limitation thereof. After reading this specification, those skilled in the art can make modifications to this embodiment without contributing any inventive step, but as long as they are within the scope of the claims of the present invention, they are protected by patent law.

Claims

1. A type of adhesive paper for recycling corrugated cardboard boxes, characterized in that, The preparation methods for bio-based pressure-sensitive adhesives, recycled substrate paper, and release paper include the following steps: A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at a temperature of 45-55℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at a temperature of 20-30℃ and an oxygen partial pressure of less than 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel. A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 30-50 minutes at a temperature of 40-50℃ and a stirring speed of 40-60r / min to obtain the modified long fiber slurry. A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper. A4. Gum arabic, rosin glycerol ester, and the microbial extracellular polysaccharide solution obtained in A1 are melt-blended with tributyl citrate at a temperature of 60-80℃ and a rotation speed of 700-900r / min for 50-70min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive is applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20g / m² using a roller coater and dried at a temperature of 75℃ for 5min under hot air conditions. Then it is laminated with release paper treated with silicone oil, cured for 24h, and then cut to obtain reclaimed adhesive paper for corrugated cardboard boxes. Both the short fiber component pulp and the long fiber component pulp are recycled pulp from corrugated cardboard boxes.

2. The recyclable paper for corrugated cardboard boxes according to claim 1, characterized in that: The components and weight proportions of the raw materials for preparing the reclaimed adhesive paper from corrugated cardboard boxes are as follows: The composition includes 100 parts short fiber slurry, 1.8-2.5 parts cellulase complex, 1.67-2.22 parts Leuconostoc membranaceus, 100 parts long fiber slurry, 1.2-1.6 parts chitin nanofiber suspension, 54-72 parts gum arabic, 9-12 parts rosin glycerol ester, and 1.8-2.4 parts tributyl citrate.

3. The method for preparing reclaimed adhesive paper from corrugated cardboard boxes according to any one of claims 1-2, characterized in that, Includes the following steps: A1. The short fiber component slurry was concentrated to a concentration of 15%, and the pH was adjusted to 4.8 using a citric acid-sodium citrate buffer system. Then, cellulase complex was added, and enzymatic hydrolysis was carried out at a temperature of 45-55℃ for 48 hours to obtain glucose solution. After sterilization of the glucose solution, Leuconostoc membranaceus was inoculated and fermented at a temperature of 20-30℃ and an oxygen partial pressure of less than 0.1% for 72 hours. After fermentation, the bacterial cells and the gel were separated to obtain microbial extracellular polysaccharide gel. A2. Add 4% of the microbial extracellular polysaccharide solution obtained in A1 to the long fiber component slurry, and simultaneously add chitin nanofiber suspension. Mix and modify for 30-50 minutes at a temperature of 40-50℃ and a stirring speed of 40-60r / min to obtain the modified long fiber slurry. A3. The modified long fiber pulp is diluted to a concentration of 0.6%, formed using a slanted wire paper machine, and after vacuum dewatering and pressing, a wet paper sheet is obtained. A 5% gum arabic solution is evenly sprayed onto the surface of the wet paper sheet using a spraying device at a sizing rate of 3 g / m². The paper sheet is then placed in a drying cylinder and dried to a dryness of 95% to obtain recycled substrate paper. A4. Gum arabic, rosin glycerol ester, and the microbial extracellular polysaccharide solution obtained in A1 are melt-blended with tributyl citrate at a temperature of 60-80℃ and a rotation speed of 700-900r / min for 50-70min to obtain a bio-based pressure-sensitive adhesive. The pressure-sensitive adhesive is applied to the back of the recycled substrate paper obtained in A3 at a coating amount of 20g / m² using a roller coater and dried at a temperature of 75℃ for 5min under hot air conditions. Then it is laminated with release paper treated with silicone oil, cured for 24h, and then cut to obtain reclaimed adhesive paper for corrugated cardboard boxes. Both the short fiber component pulp and the long fiber component pulp are recycled pulp from corrugated cardboard boxes.

4. The method for preparing recyclable paper from corrugated cardboard boxes according to claim 3, characterized in that, The method for preparing the recycled pulp for corrugated cardboard boxes includes the following steps: C1. Select waste corrugated cardboard boxes and shred them into 40mm×40mm pieces in a shredder; then put the pieces into a reaction vessel, add sodium carbonate solution, and pretreat at 80-90℃ for 40-50min; after draining the waste liquid, add phosphate buffer solution and compound biological enzyme preparation; then enzymatically hydrolyze at 45-55℃ and 55-65r / min for 80-100min; after the reaction, use a vortex separator to remove light impurities to obtain pure primary pulp; C2. The primary pulp obtained in C1 is placed in a biorefining reactor, pectinase is added, and the reaction is carried out at a temperature of 40-50℃ and a pH of 5.0 for 50-70 minutes. Then, the refined pulp is separated using a 200-mesh hydrocyclone. The long fiber component is discharged and collected through the underflow to obtain the long fiber component pulp, while the short fiber component is discharged through the overflow port and introduced into the thickening tank to obtain the short fiber component pulp.

5. The method for preparing recyclable paper from corrugated cardboard boxes according to claim 3, characterized in that: The components and weight proportions of the raw materials for preparing the recycled pulp for corrugated cardboard boxes are as follows: One part of waste corrugated cardboard box, 0.6-1.0 part of sodium carbonate solution, 7.5-10 parts of phosphate buffer solution, 0.008-0.01 parts of compound biological enzyme preparation and 0.005-0.0075 parts of pectinase; The sodium carbonate solution is an 8% sodium carbonate solution by mass; the phosphate buffer solution is a 0.05 mol / L, pH 6.0 disodium hydrogen phosphate-sodium dihydrogen phosphate buffer solution; the compound biological enzyme preparation consists of endonuclease, xylanase and laccase in an activity ratio of 5:3:

2.

6. The method for preparing recyclable paper from corrugated cardboard boxes according to claim 3, characterized in that: The citric acid-sodium citrate buffer system is specifically a citric acid-sodium citrate buffer system with a concentration of 0.1 mol / L; The cellulase complex consists of endoglucanase, exoglucanase, β-glucosidase, and xylanase in an activity ratio of 5:3:1.5:

2. Chitosan nanofiber suspension was prepared by pretreating α-chitosan with a degree of deacetylation ≤10%, then partially hydrolyzing it with 2.5 mol / L hydrochloric acid at 60℃ for 4 h, and then cyclically treating it 15 times under 120 MPa pressure using a high-pressure homogenizer.

7. The use of the adhesive paper according to any one of claims 1-2 in the preparation of reusable packaging sealing stickers, stationery notes or decorative stickers.

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