Anti-deformation paper packaging box and manufacturing process thereof

Abstract

The present invention relates to the field of packaging technology, and discloses an anti-deformation paper packaging box and a manufacturing process thereof. Modified tannic acid is prepared using tannic acid, undecylenyl chloride, and chloroprene rubber. The chloroprene rubber helps to improve heat resistance and weather resistance, and the long aliphatic carbon chain of undecylenyl chloride can have a toughening effect. An isocyanate-terminated prepolymer with good water resistance is prepared using polytetrahydrofuran diol and diphenylmethane diisocyanate as raw materials. The prepolymer is connected to the modified tannic acid using 2-mercaptobenzyl alcohol and a photoinitiator to obtain a base material, and then asphalt with good waterproof performance is added. The isocyanate groups in the base material can modify the asphalt, improving the mechanical strength, water resistance, and temperature sensitivity of the asphalt, ultimately producing a waterproof adhesive with good water resistance and good flexibility. The waterproof adhesive, PVC film, and corrugated cardboard are hot-pressed to obtain an anti-deformation cardboard. The packaging box prepared with the anti-deformation cardboard has good waterproofness and is not easy to deform.

Description

Technical Field

[0001] The invention relates to the technical field of packaging and discloses an anti-deformation paper packaging box and a manufacturing process thereof. Background Art

[0002] Corrugated paper is a wavy cardboard material composed of one or more layers of inner core paper and one or more layers of outer cover paper. It possesses excellent compressive strength and energy absorption capacity, making it a commonly used material in the packaging industry. With the development of the times, cardboard boxes have become the mainstream packaging alternative to wooden boxes to meet the growing demand for transportation. The manufacturing process of corrugated paper has been improved and optimized over time. By appropriately adjusting the number of corrugated paperboard layers and the wave shape, different types of corrugated paper can be produced to meet different packaging needs. It can also be coated with moisture-proof agents and applied with moisture-proof films to enhance its water and moisture resistance, making it suitable for a wider range of packaging needs.

[0003] As a packaging material, corrugated paper needs to have a certain ability to resist pressure and deformation. In the existing technology, moisture-proof paper packaging boxes made of corrugated paper are prone to damage in areas that are repeatedly turned over, resulting in cracks in the packaging boxes, coating shedding, etc., which greatly affects the waterproof performance and service life.

[0004] Therefore, it is necessary to study a paper packaging box with good anti-deformation, moisture-proof performance and durability and its preparation process. Summary of the Invention

[0005] The object of the present invention is to provide an anti-deformation paper packaging box and a manufacturing process thereof to solve the problems raised in the above background technology.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A manufacturing process for anti-deformation paperboard comprises the following steps: S1: taking modified tannic acid, acetone, 2-mercaptobenzyl alcohol, and a photoinitiator, mixing them uniformly, irradiating with ultraviolet light, and adding a prepolymer, tetrahydrofuran, and dibutyltin dilaurate after the reaction is complete to obtain a matrix material; adding asphalt, an anti-aging agent, diphenylthiourea, and xylene formaldehyde resin, heating and stirring, adding the matrix material, and heating and stirring to obtain a waterproof adhesive;

[0008] S2: Waterproof glue is applied on both sides of the corrugated cardboard, covered with PVC film, and then hot pressed to obtain deformation-resistant cardboard.

[0009] More optimally, the waterproof glue includes the following raw materials, calculated by mass: 10 to 15 parts of modified tannic acid, 15 to 25 parts of acetone, 5 to 7 parts of 2-mercaptobenzyl alcohol, 0.2 to 0.4 parts of photoinitiator, 20 to 30 parts of prepolymer, 100 to 150 parts of tetrahydrofuran, 0.1 to 0.2 parts of dibutyltin dilaurate, 5 to 10 parts of asphalt, 0.1 to 0.2 parts of anti-aging agent, 0.2 to 0.5 parts of diphenylthiourea, and 1 to 2 parts of xylene formaldehyde resin.

[0010] More optimally, the asphalt is petroleum asphalt.

[0011] More optimally, the preparation of the modified tannic acid includes the following steps: taking tannic acid, dissolving it with N,N-dimethylformamide and ethyl acetate, adding triethylamine and 4-dimethylaminopyridine, and stirring at 35-45°C to obtain a tannic acid solution; taking undecylenyl chloride, chloroprene rubber, and ethyl acetate, mixing them evenly to obtain a diluent, slowly dripping the diluent into the tannic acid solution, reacting under nitrogen protection for 25-30 hours, filtering, washing, and drying to obtain the modified tannic acid.

[0012] More optimally, the modified tannic acid includes the following raw materials, calculated by mass: 3 to 4 parts of tannic acid, 25 to 35 parts of N,N-dimethylformamide, 45 to 55 parts of ethyl acetate, 5 to 7 parts of triethylamine, 0.1 to 0.34 parts of 4-dimethylaminopyridine, 5 to 10 parts of undecylenic chloride, 5 to 10 parts of chloroprene rubber, and 6 to 8 parts of ethyl acetate.

[0013] More optimally, the mass ratio of the undecylenyl chloride to the chloroprene rubber is 1:1.

[0014] More optimally, the preparation of the prepolymer includes the following steps: taking polytetrahydrofuran diol, dehydrating it to obtain dehydrated polytetrahydrofuran diol; taking diphenylmethane diisocyanate and dibutyltin dilaurate, stirring and melting them, adding dehydrated polytetrahydrofuran diol, stirring and heating to 75-85° C., and keeping the temperature for reaction for 2-3 hours to obtain the prepolymer.

[0015] More optimally, the prepolymer comprises the following raw materials, calculated by mass: 90-110 parts of polytetramethylene glycol, 35-45 parts of diphenylmethane diisocyanate, and 0.1-0.2 parts of dibutyltin dilaurate.

[0016] More optimally, the glue layer thickness is 0.05-0.1 mm, and the PVC film thickness is 0.2-0.3 mm.

[0017] More optimally, the anti-deformation cardboard can be used to prepare anti-deformation paper packaging boxes.

[0018] Compared with the prior art, the beneficial effects achieved by the present invention are as follows: (1) modified tannic acid is prepared using tannic acid, undecylenyl chloride and chloroprene rubber. Tannic acid is a common material with good bonding performance and anti-corrosion effect. Adding tannic acid to waterproof glue helps to improve the service life; tannic acid is modified with undecylenyl chloride and chloroprene rubber. The long aliphatic carbon chain of undecylenyl chloride can play a toughening effect, which can improve the flexibility of the waterproof glue and greatly reduce the anti-deformation ability of the packaging box coated with the waterproof glue, which helps to extend the service life of the packaging box. Neoprene has good adhesion, good weather resistance, good aging resistance, good physical and mechanical properties and good elasticity, and is a good material for preparing glue; when modifying tannic acid, the mass ratio of undecylenyl chloride to chloroprene rubber is 1:1, and a modified tannic acid with good flexibility and good bonding can be prepared, and the vinyl group therein also lays the foundation for the next step of modification.

[0019] (2) Using polytetrahydrofuran diol and diphenylmethane diisocyanate as raw materials, an isocyanate-terminated prepolymer is prepared; polytetrahydrofuran contains a large number of ether bonds and has good water resistance, and the presence of isocyanate groups also helps to form a cross-linked structure and improve water resistance; the prepolymer is connected with modified tannic acid through 2-mercaptobenzyl alcohol and a photoinitiator to obtain a matrix material, and then asphalt with good waterproof performance is added. The isocyanate groups in the matrix material can modify the asphalt, improve the mechanical strength, water resistance and temperature sensitivity of the asphalt, and finally a waterproof adhesive with good water resistance and good flexibility is obtained.

[0020] (3) Anti-deformation cardboard is obtained by hot pressing using waterproof glue, PVC film, and corrugated cardboard. Both sides of the anti-deformation cardboard are coated with waterproof glue and PVC film. The PVC film has good tension and fracture resistance, the corrugated cardboard has high hardness, and the waterproof glue has good flexibility. The packaging box prepared with the anti-deformation cardboard has good waterproofness and is not easy to deform. The hot pressing process can further increase the cross-linking degree between the layers of the anti-deformation cardboard, further improving the anti-deformation ability. DETAILED DESCRIPTION

[0021] The following is a clear and complete description of the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0022] The specific implementation plan will include the following chemicals: N,N-dimethylformamide (CAS: 68-12-2); dibutyltin dilaurate (CAS: 77-58-7); tetrahydrofuran (CAS: 109-99-9); acetone (CAS: 67-64-1); 2-mercaptobenzyl alcohol (CAS: 4521-31-7); photoinitiator (photoinitiator 1173, CAS: 7473-98-5); asphalt (Zehao 30#, Hengshui Zehao Rubber Chemical Co., Ltd.); antioxidant (antioxidant D, CAS: 135-88-6); diphenylthiourea (CAS: 102-08-9); xylene formaldehyde resin (Article No.: A139756, Zhengzhou Alpha Chemical Co., Ltd.); tannic acid (Cat. No. PCS0301, Chengdu Zhibiao Huachun Biotechnology Co., Ltd.); ethyl acetate (CAS: 141-78-6); triethylamine (CAS: 121-44-8); 4-dimethylaminopyridine (CAS: 1122-58-3); undecenoyl chloride (CAS: 38460-95-6); chloroprene rubber (Cat. No. GA2247, Hubei Guangao Biotechnology Co., Ltd.); polytetrahydrofuran diol (CAS: 25190-06-1); diphenylmethane diisocyanate (CAS: 5101-68-8); PVC film (Model: ZH0220P, Dongguan Zhongheng Adhesive Products Co., Ltd.);

[0023] The following parts are by mass;

[0024] Example 1: S1: 100 parts of polytetrahydrofuran diol were dehydrated at 115° C. under vacuum for 2.5 hours, and cooled to obtain dehydrated polytetrahydrofuran diol; 40 parts of diphenylmethane diisocyanate and 0.1 part of dibutyltin dilaurate were stirred and melted at 55° C., dehydrated polytetrahydrofuran diol was added, and the mixture was stirred and heated to 79° C., and the mixture was kept warm for reaction for 3 hours to obtain a prepolymer;

[0025] S2: Take 3.5 parts of tannic acid, add 30 parts of N,N-dimethylformamide and 50 parts of ethyl acetate, stir and dissolve, add 6 parts of triethylamine and 0.3 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 8 parts of undecylenyl chloride, 8 parts of chloroprene rubber, and 7 parts of ethyl acetate, mix them evenly to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0026] S3: Take 13 parts of modified tannic acid, 20 parts of acetone, 6 parts of 2-mercaptobenzyl alcohol, and 0.3 parts of photoinitiator UV1173, mix them evenly, irradiate with ultraviolet light for 24 hours, add 25 parts of prepolymer, 130 parts of tetrahydrofuran, and 0.1 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 7 parts of asphalt, 0.1 parts of anti-aging agent, 0.24 parts of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, maintain stirring at 90°C for 1 hour, and obtain the waterproof adhesive;

[0027] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.2mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0028] Example 2: S1: 90 parts of polytetrahydrofuran diol were dehydrated at 115° C. under vacuum for 2.5 hours, and cooled to obtain dehydrated polytetrahydrofuran diol; 35 parts of diphenylmethane diisocyanate and 0.1 part of dibutyltin dilaurate were stirred and melted at 55° C., dehydrated polytetrahydrofuran diol was added, and the mixture was stirred and heated to 79° C., and the mixture was kept warm for reaction for 3 hours to obtain a prepolymer;

[0029] S2: Take 3 parts of tannic acid, add 25 parts of N,N-dimethylformamide and 45 parts of ethyl acetate, stir and dissolve, add 5 parts of triethylamine and 0.1 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 5 parts of undecylenyl chloride, 5 parts of chloroprene rubber, and 6 parts of ethyl acetate, mix well to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0030] S3: Take 10 parts of modified tannic acid, 15 parts of acetone, 5 parts of 2-mercaptobenzyl alcohol, and 0.2 parts of photoinitiator UV1173, mix them evenly, and irradiate with ultraviolet light for 24 hours. Add 20 parts of prepolymer, 100 parts of tetrahydrofuran, and 0.1 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 10 parts of asphalt, 0.1 parts of anti-aging agent, 0.2 parts of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, and keep stirring at 90°C for 1 hour to obtain the waterproof adhesive;

[0031] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.05mm and the thickness of the PVC film is 0.3mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0032] Example 3: S1: 110 parts of polytetrahydrofuran diol were dehydrated at 115° C. under vacuum for 2.5 hours, and cooled to obtain dehydrated polytetrahydrofuran diol; 45 parts of diphenylmethane diisocyanate and 0.2 parts of dibutyltin dilaurate were stirred and melted at 55° C., dehydrated polytetrahydrofuran diol was added, and the mixture was stirred and heated to 79° C., and the mixture was kept warm for reaction for 3 hours to obtain a prepolymer;

[0033] S2: Take 4 parts of tannic acid, add 35 parts of N,N-dimethylformamide and 55 parts of ethyl acetate, stir and dissolve, add 7 parts of triethylamine and 0.34 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 10 parts of undecylenyl chloride, 10 parts of chloroprene rubber, and 8 parts of ethyl acetate, mix well to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0034] S3: Take 15 parts of modified tannic acid, 25 parts of acetone, 7 parts of 2-mercaptobenzyl alcohol, and 0.4 parts of photoinitiator UV1173, mix them evenly, and irradiate them with ultraviolet light for 24 hours. Then add 30 parts of prepolymer, 150 parts of tetrahydrofuran, and 0.2 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 5 parts of asphalt, 0.2 parts of anti-aging agent, 0.5 parts of diphenylthiourea, and 2 parts of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, and keep stirring at 90°C for 1 hour to obtain the waterproof adhesive;

[0035] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.3mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0036] Comparative Example 1 (only undecylenyl chloride was used instead of chloroprene rubber when modifying tannic acid, and the remaining steps were consistent with Example 1): S1: 100 parts of polytetrahydrofuran diol were dehydrated at 115° C. under vacuum for 2.5 hours, and cooled to obtain dehydrated polytetrahydrofuran diol; 40 parts of diphenylmethane diisocyanate and 0.1 part of dibutyltin dilaurate were stirred and melted at 55° C., dehydrated polytetrahydrofuran diol was added, and the mixture was stirred and heated to 79° C., and the reaction was kept warm for 3 hours to obtain a prepolymer;

[0037] S2: Take 3.5 parts of tannic acid, add 30 parts of N,N-dimethylformamide and 50 parts of ethyl acetate, stir and dissolve, add 6 parts of triethylamine and 0.3 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 16 parts of undecenoyl chloride and 7 parts of ethyl acetate, mix well to obtain a dilution, slowly drop the dilution into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0038] S3: Take 13 parts of modified tannic acid, 20 parts of acetone, 6 parts of 2-mercaptobenzyl alcohol, and 0.3 parts of photoinitiator UV1173, mix them evenly, irradiate with ultraviolet light for 24 hours, add 25 parts of prepolymer, 130 parts of tetrahydrofuran, and 0.1 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 7 parts of asphalt, 0.1 parts of anti-aging agent, 0.24 parts of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, maintain stirring at 90°C for 1 hour, and obtain the waterproof adhesive;

[0039] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.2mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0040] Comparative Example 2 (changing the amount of undecylenyl chloride and chloroprene rubber added, the remaining method steps are consistent with Example 1): S1: Take 100 parts of polytetrahydrofuran diol, dehydrate under vacuum at 115° C. for 2.5 hours, and cool to obtain dehydrated polytetrahydrofuran diol; take 40 parts of diphenylmethane diisocyanate and 0.1 part of dibutyltin dilaurate, stir and melt at 55° C., add dehydrated polytetrahydrofuran diol, stir and raise the temperature to 79° C., and keep the reaction for 3 hours to obtain a prepolymer;

[0041] S2: Take 3.5 parts of tannic acid, add 30 parts of N,N-dimethylformamide, and 50 parts of ethyl acetate, stir and dissolve, add 6 parts of triethylamine and 0.3 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 4 parts of undecylenic acid chloride, 16 parts of chloroprene rubber, and 7 parts of ethyl acetate, mix well to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0042] S3: Take 13 parts of modified tannic acid, 20 parts of acetone, 6 parts of 2-mercaptobenzyl alcohol, and 0.3 parts of photoinitiator UV1173, mix them evenly, irradiate with ultraviolet light for 24 hours, add 25 parts of prepolymer, 130 parts of tetrahydrofuran, and 0.1 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 7 parts of asphalt, 0.1 parts of anti-aging agent, 0.24 parts of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, maintain stirring at 90°C for 1 hour, and obtain the waterproof adhesive;

[0043] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.2mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0044] Comparative Example 3 (2-mercaptobenzyl alcohol is not used, and the remaining method steps are consistent with Example 1): S1: 100 parts of polytetrahydrofuran diol are taken, dehydrated at 115° C. under vacuum for 2.5 hours, and cooled to obtain dehydrated polytetrahydrofuran diol; 40 parts of diphenylmethane diisocyanate and 0.1 part of dibutyltin dilaurate are taken, stirred and melted at 55° C., dehydrated polytetrahydrofuran diol is added, stirred and heated to 79° C., and kept warm for reaction for 3 hours to obtain a prepolymer;

[0045] S2: Take 3.5 parts of tannic acid, add 30 parts of N,N-dimethylformamide and 50 parts of ethyl acetate, stir and dissolve, add 6 parts of triethylamine and 0.3 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 8 parts of undecylenyl chloride, 8 parts of chloroprene rubber, and 7 parts of ethyl acetate, mix them evenly to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0046] S3: Take 13 parts of modified tannic acid, 25 parts of prepolymer, 130 parts of tetrahydrofuran, and 0.1 part of dibutyltin dilaurate, react at 60°C for 4 hours to obtain the base material; take 7 parts of asphalt, 0.1 part of anti-aging agent, 0.24 part of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, maintain stirring at 90°C for 1 hour, and obtain the waterproof adhesive;

[0047] S4: Coat waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.2mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0048] Comparative Example 4 (using polytetrahydrofuran diol instead of prepolymer, and its method and steps are consistent with Example 1): S1: Take 3.5 parts of tannic acid, 30 parts of N,N-dimethylformamide, and 50 parts of ethyl acetate, stir and dissolve, add 6 parts of triethylamine and 0.3 parts of 4-dimethylaminopyridine, and stir at 35°C to obtain a tannic acid solution; take 8 parts of undecylenyl chloride, 8 parts of chloroprene rubber, and 7 parts of ethyl acetate, mix uniformly to obtain a diluent, slowly drop the diluent into the tannic acid solution, react under nitrogen protection for 28 hours, filter, wash, and dry to obtain modified tannic acid;

[0049] S2: Take 13 parts of modified tannic acid, 20 parts of acetone, 6 parts of 2-mercaptobenzyl alcohol, and 0.3 parts of photoinitiator UV1173, mix them evenly, irradiate with ultraviolet light for 24 hours, add 25 parts of polytetrahydrofuran diol, 130 parts of tetrahydrofuran, and 0.1 parts of dibutyltin dilaurate, and react at 60°C for 4 hours to obtain the base material; take 7 parts of asphalt, 0.1 parts of anti-aging agent, 0.24 parts of diphenylthiourea, and 1 part of xylene formaldehyde resin, stir at 130°C for 2 hours, add the base material, maintain stirring at 90°C for 1 hour, and obtain the waterproof adhesive;

[0050] S3: Apply waterproof glue on both sides of the corrugated cardboard and cover it with PVC film. The thickness of the glue layer is 0.1mm and the thickness of the PVC film is 0.2mm. Hot press at 250KPa and 110℃ for 1min to obtain deformation-proof cardboard.

[0051] Experiment: (1) The anti-deformation cardboards in Examples 1 to 3 and Comparative Examples 1 to 4 were tested for water resistance according to the standard GB / T19250-2013; (2) The anti-deformation cardboards were bent repeatedly 100 times and then tested for water resistance; (3) The compressive strength was tested using an HH-NP5600 cardboard bursting tester; the specific data are shown in the table below;

[0052] Waterproof before bending Waterproof after bending Compressive strength (MPa) Example 1 No water seepage for 120 minutes 120min water-proof 5.7 Example 2 No water seepage for 120 minutes No water seepage for 120 minutes 5.6 Example 3 120min water-proof 120min water-proof 5.7 Comparative Example 1 120min water-proof Water seepage started after 110 minutes 5.4 Comparative Example 2 Water seepage starts after 100 minutes Water seepage started after 80 minutes 4.6 Comparative Example 3 Water seepage started after 110 minutes Water seepage started after 80 minutes 4.8 Comparative Example 4 Water seepage starts after 100 minutes Water seepage started after 80 minutes 4.5

[0053] Conclusion: As can be seen from the above table, the deformation-resistant paperboards prepared in Examples 1 to 3 all have good water resistance and deformation resistance, and maintain good water resistance after repeated bending. In Comparative Example 1, only undecylenyl chloride is used without chloroprene rubber when modifying tannic acid. Chloroprene rubber has good adhesion, physical and mechanical properties, and elasticity, and its omission leads to decreased water resistance. In Comparative Example 2, the amount of undecylenyl chloride and chloroprene rubber added is varied, and excessive chloroprene rubber is added, resulting in decreased water resistance and water resistance after bending. In Comparative Example 3, 2-mercaptobenzyl alcohol is not used, and the modified tannic acid and prepolymer are not connected, resulting in a decrease in molecular weight and crosslinking degree, leading to decreased water resistance. In Comparative Example 4, polytetrahydrofuran diol is used instead of the prepolymer. Due to the absence of isocyanate groups, the mechanical strength, water resistance, and temperature sensitivity of the asphalt are not improved, resulting in decreased performance.

[0054] In summary, the data show that the anti-deformation paperboard prepared by the method proposed in the present invention can be used to prepare anti-deformation paper packaging boxes with good waterproof performance, strong anti-deformation ability and durability.

[0055] Finally, it should be noted that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A process for manufacturing an anti-deformation paperboard, characterized by: The method comprises the following steps: S1: taking modified tannic acid, acetone, 2-mercaptobenzyl alcohol, and a photoinitiator, mixing them evenly, irradiating with ultraviolet light, and after the reaction is completed, adding a prepolymer, tetrahydrofuran, and dibutyltin dilaurate to react to obtain a matrix material; adding asphalt, an anti-aging agent, diphenylthiourea, and xylene formaldehyde resin, heating and stirring, adding the matrix material, and heating and stirring to obtain a waterproof adhesive; S2: Coating waterproof glue on both sides of the corrugated cardboard, covering with PVC film, and hot pressing to obtain deformation-resistant cardboard; The preparation of the modified tannic acid comprises the following steps: dissolving tannic acid with N,N-dimethylformamide and ethyl acetate, adding triethylamine and 4-dimethylaminopyridine, and stirring at 35-45° C. to obtain a tannic acid solution; mixing undecylenyl chloride, chloroprene rubber, and ethyl acetate to obtain a diluent, slowly dripping the diluent into the tannic acid solution, reacting under nitrogen protection for 25-30 hours, filtering, washing, and drying to obtain the modified tannic acid; The modified tannic acid comprises the following raw materials, calculated by mass: 3-4 parts of tannic acid, 25-35 parts of N,N-dimethylformamide, 45-55 parts of ethyl acetate, 5-7 parts of triethylamine, 0.1-0.34 parts of 4-dimethylaminopyridine, 5-10 parts of undecylenic acid chloride, 5-10 parts of chloroprene rubber, and 6-8 parts of ethyl acetate; The mass ratio of the undecylenyl chloride to the chloroprene rubber is 1:1; The waterproof glue comprises the following raw materials, calculated by mass: 10-15 parts of modified tannic acid, 15-25 parts of acetone, 5-7 parts of 2-mercaptobenzyl alcohol, 0.2-0.4 parts of photoinitiator, 20-30 parts of prepolymer, 100-150 parts of tetrahydrofuran, 0.1-0.2 parts of dibutyltin dilaurate, 5-10 parts of asphalt, 0.1-0.2 parts of anti-aging agent, 0.2-0.5 parts of diphenylthiourea, and 1-2 parts of xylene formaldehyde resin; The preparation of the prepolymer comprises the following steps: taking polytetrahydrofuran diol, dehydrating it to obtain dehydrated polytetrahydrofuran diol; taking diphenylmethane diisocyanate and dibutyltin dilaurate, stirring and melting them, adding dehydrated polytetrahydrofuran diol, stirring and heating to 75-85° C., and keeping the temperature to react for 2-3 hours to obtain the prepolymer.

2. The process for manufacturing deformation-resistant paperboard according to claim 1, characterized in that: The prepolymer comprises the following raw materials, calculated by mass: 90-110 parts of polytetramethylene glycol, 35-45 parts of diphenylmethane diisocyanate, and 0.1-0.2 parts of dibutyltin dilaurate.

3. The manufacturing process of the anti-deformation paperboard according to claim 1, characterized in that: The thickness of the glue layer is 0.05~0.1mm, and the thickness of the PVC film is 0.2~0.3mm.

4. The anti-deformation paperboard obtained by the manufacturing process of the anti-deformation paperboard according to any one of claims 1 to 3.

5. A deformation-resistant paper packaging box, characterized by: It is prepared from the anti-deformation paperboard according to claim 4.