A corrugated paper printing and laminating process

Abstract

This application relates to the field of packaging material preparation, and particularly to a corrugated paper printing and laminating process; the method includes: mixing gelatinized starch, titanium dioxide powder and a sizing agent additive solution in an inert atmosphere and stirring to obtain a sizing composite agent; coating the sizing composite agent on the surface of the corrugated paper, laying and leveling the film layer, and then performing photocuring in an ultraviolet light environment to obtain laminated corrugated paper; wherein, by weight, the raw materials of the sizing agent additive solution include: ferrous chloride, a photoinitiator, sodium silicate, carboxymethyl cellulose, glutaric anhydride; by introducing a sizing agent additive including ferrous chloride, a photoinitiator, sodium silicate, carboxymethyl cellulose and glutaric anhydride, and then performing the operations of first leveling and then ultraviolet light photocuring, a laminated corrugated paper material with good strength, hydrophobicity and flatness can be obtained.

Description

Technical Field

[0001] The present application relates to the field of packaging material preparation, and particularly to a corrugated paper printing and laminating process. Background Art

[0002] With the gradual prosperity of the commodity industry, various materials are used for packaging. Among them, corrugated paper, which is light and low-cost, has given rise to three major categories: high-strength corrugated paper, hydrophobic corrugated paper, and composite corrugated paper. Composite corrugated paper is based on corrugated paper, with a PET film or OPP film covering its surface. The PET film or OPP film is mainly combined with the corrugated paper through a sizing agent, taking advantage of the waterproofness and toughness of the PET film or OPP film to improve the hydrophobicity and toughness of the corrugated paper. However, currently, due to cost considerations, the sizing agent generally used is gelatinized starch as the surface sizing agent, but this results in relatively low hydrophobicity of the corrugated paper and cannot meet the requirements of a low water absorption Cobb value.

[0003] Currently, the main ways to improve the hydrophobicity of the sizing agent are to add hydrophobic components or modify the gelatinized starch. However, in both cases, the sizing agent needs to be treated at a relatively high temperature first to activate the gelatinized starch component therein, so that the laminating process of the corrugated paper needs to be carried out under high-temperature conditions. Since the PET film or OPP film has poor high-temperature resistance, the high-temperature environment will affect the flatness of the PET film or OPP film, making the laminated corrugated paper uneven and reducing the strength of the corrugated paper, thus affecting the use of the laminated corrugated paper. Therefore, how to provide a corrugated paper printing and laminating process to solve the technical problems of unevenness and insufficient strength of the currently laminated corrugated paper. Summary of the Invention

[0004] The present application provides a corrugated paper printing and laminating process to solve the technical problem in the prior art that it is difficult to ensure the flatness and insufficient strength of the PET film or OPP film because the sizing agent of the laminated corrugated paper needs to be processed in a high-temperature environment.

[0005] In a first aspect, the present application provides a corrugated paper printing and laminating process, and the method includes:

[0006] Mix gelatinized starch, titanium dioxide powder, and a sizing agent additive solution in an inert atmosphere and stir to obtain a sizing composite agent;

[0007] Coat the sizing composite agent on the surface of the corrugated paper, perform paving and leveling of the film layer, and then carry out photocuring in an ultraviolet light environment to obtain a laminated corrugated paper;

[0008] Among them, by weight, the raw materials of the sizing agent additive solution include:

[0009] Ferrous chloride: 10 - 15 parts, photoinitiator: 5 - 10 parts, sodium silicate: 2 - 5 parts, carboxymethyl cellulose: 2 - 5 parts, glutaric anhydride: 1 - 2 parts.

[0010] Optionally, the mass ratio of the gelatinized starch, the titanium dioxide powder and the sizing agent additive solution is 50 - 60:15 - 25:10 - 20.

[0011] Optionally, the solid content of the sizing composite is 35% - 45%, and the viscosity is 20 mPa·s - 35 mPa·s.

[0012] Optionally, the photoinitiator includes at least one of 2-hydroxy-2-methyl-1-(4-methoxy)phenyl-1-propanone, 2-hydroxy-2-methyl-1-(4-hydroxyethoxy)phenyl-1-propanone, and 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone.

[0013] Optionally, the titanium dioxide powder includes first particle titanium powder, second particle titanium powder and third particle titanium powder. The particle size of the first particle titanium powder is 10 nm - 15 nm, the particle size of the second particle titanium powder is 15 nm - 20 nm, and the particle size of the third particle titanium powder is 20 nm - 25 nm.

[0014] Optionally, the preparation method of the gelatinized starch includes:

[0015] Dissolve the starch in water, add ammonium sulfate solution to the solution to a preset pH value, and then perform microwave treatment to obtain gelatinized starch;

[0016] Among them, the starch includes corn starch and / or potato starch.

[0017] Optionally, the preset pH value is 8.5 - 9.0, the frequency of the microwave treatment is 500 kHz - 2000 kHz, and the time of the microwave treatment is 5 min - 10 min.

[0018] Optionally, the wavelength of the ultraviolet light used for photocuring is 365 nm - 395 nm, and the time of photocuring is 20 s - 30 s.

[0019] Optionally, the temperature of the leveling is 25°C - 27°C.

[0020] In a second aspect, the present application provides a printed laminated corrugated paper. The laminated corrugated paper is prepared by the preparation method described in the first aspect. The structure of the laminated corrugated paper from the inside to the outside is successively a corrugated paper base plate, a photocured layer and a laminated layer. The thickness ratio of the photocured layer to the laminated layer is 0.5 - 1:1.5.

[0021] The above technical solution provided by the embodiments of the present application has the following advantages compared with the prior art:

[0022] A corrugated paper printing and laminating process provided by an embodiment of the present application. By adding titanium dioxide powder and a sizing agent additive including ferrous chloride, a photoinitiator, sodium silicate, carboxymethyl cellulose, and glutaric anhydride to gelatinized starch, the starch granules of the gelatinized starch are dispersed by the titanium dioxide powder, facilitating the esterification reaction between the gelatinized starch and glutaric anhydride to generate a large-frame molecular structure. Then, the ferric ions generated by the photocatalytic reaction of the ferrous ions in ferrous chloride during the photocuring stage are used. These ferric ions can enter the fiber structure of the corrugated paper and react with water to form ferric hydroxide colloid particles, blocking the pores of the fiber structure, thereby playing a hydrophobic role. At the same time, the ferric ions can also enter into the large-frame molecule to form ferric hydroxide colloid particles, further adsorbing each material to make the reaction complete. Then, the photoinitiator is used in combination with titanium dioxide powder for photocuring. The photoinitiator undergoes curing under the combined action of ultraviolet light and titanium dioxide powder to form a complex network structure, thus cooperating with the molecular structure formed by the gelatinized starch, enhancing the curing effect of the sizing agent, and improving the overall strength of the corrugated paper. Then, the sodium silicate aqueous solution formed by sodium silicate is used to quickly form a colloid and cure the complex network structure and molecular structure, thereby being able to quickly bond the film layer and the corrugated paper. Carboxymethyl cellulose is used to stabilize each component and increase the viscosity of the sizing agent, enabling it to cooperate with titanium dioxide powder and quickly disperse on the corrugated paper, facilitating the later photocuring stage. And the overall process does not need to be carried out in a high-temperature environment above 100°C, only ultraviolet light photocuring is required. Therefore, the flatness of the PET film or OPP film can be ensured while the strength of the corrugated paper is improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] The drawings here are incorporated into the specification and form a part of this specification, showing embodiments consistent with the present application, and are used together with the specification to explain the principles of the present application.

[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, for those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0025] Figure 1 It is a schematic flowchart of the preparation method of the printed and laminated corrugated paper provided by the embodiment of the present application;

[0026] Figure 2 It is a schematic structural diagram of the printed and laminated corrugated paper provided by the embodiment of the present application;

[0027] Among them, 1 - corrugated paper base board, 2 - photocuring layer, 3 - laminating layer. Detailed implementation mode

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Apparently, the described embodiments are some, but not all, of the embodiments of the present application. All other embodiments obtained by those of ordinary skill in the art based on the embodiments in the present application without creative efforts shall fall within the scope of protection of the present application.

[0029] Unless otherwise specifically stated, various raw materials, reagents, instruments, and equipment used in the present application can be obtained through market purchases or can be prepared by existing methods.

[0030] As Figure 1 shown, the embodiments of the present application provide a corrugated paper printing and laminating process, and the method includes:

[0031] S1. Mix gelatinized starch, titanium dioxide powder, and a sizing agent additive solution in an inert atmosphere and stir to obtain a sizing composite agent;

[0032] S2. Coat the sizing composite agent on the surface of the corrugated paper, lay and flatten the film layer, and then perform photocuring in an ultraviolet light environment to obtain a laminated corrugated paper;

[0033] Among them, by weight, the raw materials of the sizing agent additive solution include:

[0034] Ferrous chloride: 10 - 15 parts, photoinitiator: 5 - 10 parts, sodium silicate: 2 - 5 parts, carboxymethyl cellulose: 2 - 5 parts, glutaric anhydride: 1 - 2 parts.

[0035] In the embodiments of the present application, the specific weight of ferrous chloride is controlled. Since the ferrous ions in ferrous chloride will undergo a photocatalytic reaction to generate ferric ions during the photocuring stage, and the ferric ions will react with the water in the corrugated paper or the water in the sizing composite agent to generate ferric hydroxide colloidal particles. These colloidal particles will block the water passage in the fiber structure of the corrugated paper, thereby improving the hydrophobicity of the corrugated paper body. And these colloidal particles will adsorb other raw materials during the esterification reaction between gelatinized starch and glutaric anhydride to form a large framework molecular structure, accelerating the reaction.

[0036] Control the specific weight parts of the photoinitiator. By introducing the photoinitiator, it can undergo a photocuring reaction with titanium dioxide powder under the condition of ultraviolet photocatalysis to form a complex network structure, which can be compounded with the large-frame molecular structure, increasing the bonding ability of the sizing agent. At the same time, it can also form a multi-surrounding structure to block the water passage, so that the paved film layer can be closely combined with the corrugated paper while improving the hydrophobicity and mechanical strength of the laminated corrugated paper.

[0037] Control the specific weight parts of sodium silicate. Since sodium silicate can form an aqueous solution of sodium silicate with water, it can accelerate the photocuring to form a complex network structure and the esterification reaction of gelatinized starch with glutaric anhydride to generate a large-frame molecular structure, and promote its stable molding, thereby improving the bonding strength and mechanical strength of the PET film or OPP film with the corrugated paper.

[0038] Control the specific weight parts of carboxymethyl cellulose. Since carboxymethyl cellulose has good thickening, stabilizing and dispersing effects, carboxymethyl cellulose can stabilize the formed complex network structure and large-frame molecular structure, and at the same time accelerate the diffusion of the sizing compound and promote the complete coverage of the sizing compound on the surface of the corrugated paper.

[0039] Control the specific weight parts of glutaric anhydride. Since the anhydride group in glutaric anhydride can undergo an esterification reaction with the hydroxyl group of gelatinized starch after hydrolysis, a macromolecular structure can be formed, improving the bonding strength and mechanical strength of the PET film or OPP film with the corrugated paper.

[0040] The inert atmosphere includes nitrogen or noble gases.

[0041] In some alternative embodiments, the mass ratio of the gelatinized starch, the titanium dioxide powder and the sizing agent additive solution is 50-60:15-25:10-20.

[0042] In the embodiments of the present application, controlling the specific ratio of the gelatinized starch, the titanium dioxide powder and the sizing agent additive can promote the complete reaction of the gelatinized starch with glutaric anhydride, and at the same time can also promote the smooth progress of the photocatalysis and photocuring processes.

[0043] In some alternative embodiments, the solid content of the sizing compound is 35%-45%, and the viscosity is 20 mPa·s-35 mPa·s.

[0044] In the embodiments of the present application, controlling the specific solid content and viscosity of the sizing compound can ensure its rapid diffusion on the corrugated paper, facilitating subsequent lamination.

[0045] In some alternative embodiments, the photoinitiator includes at least one of 2-hydroxy-2-methyl-1-(4-methoxy)phenyl-1-propanone, 2-hydroxy-2-methyl-1-(4-hydroxyethoxy)phenyl-1-propanone, and 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone.

[0046] In the embodiments of the present application, a ketone photoinitiator is used. On the one hand, the viscosity of the ketone photoinitiator meets the usage requirements of the sizing composite agent. On the other hand, the photocuring process of the ketone photoinitiator is fast and thorough. Therefore, a large number of complex network structures can be quickly formed for use.

[0047] In some alternative embodiments, the titanium dioxide powder includes first particulate titanium powder, second particulate titanium powder, and third particulate titanium powder. The particle size of the first particulate titanium powder is 10 nm to 15 nm, the particle size of the second particulate titanium powder is 15 nm to 20 nm, and the particle size of the third particulate titanium powder is 20 nm to 25 nm.

[0048] In the embodiments of the present application, it is defined that the titanium dioxide powder includes three stages of particle sizes. On the one hand, titanium dioxide powders with different particle sizes can provide a large height difference when the sizing composite agent flows, thereby improving the diffusion ability of the sizing composite agent. On the other hand, the photocuring and photocatalysis speeds of titanium dioxide powders with different particle sizes are different, so that the photocuring reaction and the photocatalysis reaction can proceed simultaneously, shortening the time required for photocatalysis and photocuring.

[0049] In some alternative embodiments, the preparation method of the gelatinized starch includes:

[0050] S101. Dissolve the starch in water, add an ammonia water solution to the solution to a preset pH value, and then perform microwave treatment to obtain gelatinized starch;

[0051] Wherein, the starch includes corn starch and / or potato starch.

[0052] In some alternative embodiments, the preset pH value is 8.5 to 9.0, the frequency of the microwave treatment is 500 kHz to 2000 kHz, and the time of the microwave treatment is 5 min to 10 min.

[0053] In the embodiments of the present application, by adding an ammonia water solution to adjust the pH value of the starch to weakly alkaline, and then performing high-frequency microwave to completely gelatinize the starch. At the same time, the microwave treatment will cause the ammonia water to form ammonia gas, and the ammonia gas surging in the starch will carry away a large amount of water in the starch, thereby ensuring the gelatinization effect.

[0054] In some alternative embodiments, the wavelength of the ultraviolet light used for photocuring is 365 nm to 395 nm, and the time of photocuring is 20 s to 30 s.

[0055] In the embodiments of the present application, by controlling the specific wavelength parameters and time parameters of photocuring, the photocuring reaction between titanium dioxide powder and photoinitiator can be made complete, and a sufficient number of complex network structures can be formed.

[0056] In some alternative embodiments, the leveling temperature is 25°C to 27°C.

[0057] In the embodiments of the present application, by controlling the leveling temperature to be 20°C to 27°C, the esterification reaction between gelatinized starch and glutaric anhydride can occur, so as to form a sufficient number of large framework molecular structures and improve the bonding strength between the PET film or OPP film and the corrugated paper.

[0058] Based on a general inventive concept, the present application provides a printed laminated corrugated paper. The laminated corrugated paper is prepared by the preparation method. The structure of the laminated corrugated paper from the inside to the outside is successively a corrugated paper base board, a photocuring layer, and a laminating layer. The thickness ratio of the photocuring layer to the laminating layer is 0.5 to 1:1.5.

[0059] In the embodiments of the present application, by controlling the specific thickness relationship between the photocuring layer and the laminating layer, it is possible to avoid the laminating layer shifting due to the excessive thickness of the photocuring layer, which affects the use.

[0060] This laminated corrugated paper is realized based on the above preparation method. The specific steps of this preparation method can refer to the above embodiments. Since this laminated corrugated paper adopts some or all of the technical solutions of the above embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0061] The following will further illustrate the present application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application. For the experimental methods without specific conditions noted in the following embodiments, they are usually determined according to national standards. If there is no corresponding national standard, they are carried out according to general international standards, conventional conditions, or the conditions recommended by the manufacturer.

[0062] Example 1

[0063] As Figure 1 shown, a corrugated paper printing and laminating process includes:

[0064] S1. Mix gelatinized starch, titanium dioxide powder, and sizing agent additive solution in an inert atmosphere and stir to obtain a sizing composite agent;

[0065] S2. Coat the sizing composite agent on the surface of the corrugated paper, carry out the paving and leveling of the film layer, and then carry out photocuring in an ultraviolet light environment to obtain a laminated corrugated paper;

[0066] Among them, based on parts by weight, the raw materials of the sizing agent additive solution include:

[0067] Ferrous chloride: 12 parts, photoinitiator: 8 parts, sodium silicate: 4 parts, carboxymethyl cellulose: 4 parts, glutaric anhydride: 2 parts.

[0068] The mass ratio of gelatinized starch, titanium dioxide powder and the sizing agent additive solution is 55:20:18.

[0069] The photoinitiator is 2-hydroxy-2-methyl-1-(4-methoxy)phenyl-1-propanone.

[0070] The starch is corn starch.

[0071] The preset pH value is 9.0, the frequency of microwave treatment is 1500 kHz, and the time of microwave treatment is 8 min.

[0072] The wavelength of the ultraviolet light used for photocuring is 370 nm, and the time of photocuring is 25 s.

[0073] The temperature of leveling is 26 °C.

[0074] The thickness ratio of the prepared photocured layer and the film laminating layer is 0.85:1.5.

[0075] Example 2

[0076] Comparing Example 2 with Example 1, the difference between Example 2 and Example 1 is that:

[0077] The raw materials of the sizing agent additive solution include:

[0078] Ferrous chloride: 11 parts, photoinitiator: 6 parts, sodium silicate: 3 parts, carboxymethyl cellulose: 2 parts, glutaric anhydride: 1 part.

[0079] The mass ratio of gelatinized starch, titanium dioxide powder and the sizing agent additive solution is 50:16:11.

[0080] The photoinitiator is 2-hydroxy-2-methyl-1-(4-hydroxyethoxy)phenyl-1-propanone.

[0081] The thickness ratio of the prepared photocured layer and the film laminating layer is 0.7:1.5.

[0082] Example 3

[0083] Comparing Example 3 with Example 1, the difference between Example 3 and Example 1 is that:

[0084] The raw materials of the sizing agent additive solution include:

[0085] Ferrous chloride: 14 parts, photoinitiator: 9 parts, sodium silicate: 2 parts, carboxymethyl cellulose: 3 parts, glutaric anhydride: 2 parts.

[0086] The mass ratio of gelatinized starch, titanium dioxide powder and sizing agent additive solution is 60:25:20.

[0087] The photoinitiator is 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone.

[0088] The thickness ratio of the prepared photocured layer to the film laminating layer is 0.68:1.5

[0089] Example 4

[0090] Comparing Example 4 with Example 1, the differences between Example 4 and Example 1 are as follows:

[0091] The preset pH value is 8.5, the frequency of microwave treatment is 700 kHz, and the time of microwave treatment is 10 min.

[0092] The wavelength of the ultraviolet light used for photocuring is 365 nm, and the photocuring time is 20 s.

[0093] The temperature of leveling is 25 °C.

[0094] The thickness ratio of the prepared photocured layer to the film laminating layer is 0.5:1.5.

[0095] Example 5

[0096] Comparing Example 5 with Example 1, the differences between Example 5 and Example 1 are as follows:

[0097] The preset pH value is 8.5, the frequency of microwave treatment is 2000 kHz, and the time of microwave treatment is 5 min.

[0098] The wavelength of the ultraviolet light used for photocuring is 390 nm, and the photocuring time is 22 s.

[0099] The temperature of leveling is 27 °C.

[0100] The thickness ratio of the prepared photocured layer to the film laminating layer is 1:1.5.

[0101] Example 6

[0102] Comparing Example 6 with Example 1, the differences between Example 6 and Example 1 are as follows:

[0103] The starch is sweet potato starch.

[0104] Comparative Example 1

[0105] Comparative Example 1 and Example 1 will be compared. The differences between Comparative Example 1 and Example 1 are as follows:

[0106] Titanium dioxide powder and sizing agent additive solution are not added, and photo-curing is not carried out. The flattening temperature is 115°C to 125°C.

[0107] Comparative Example 2

[0108] Comparative Example 2 and Example 1 will be compared. The differences between Comparative Example 2 and Example 1 are as follows:

[0109] Titanium dioxide powder and photoinitiator are not introduced.

[0110] Comparative Example 3

[0111] Comparative Example 3 and Example 1 will be compared. The differences between Comparative Example 3 and Example 1 are as follows:

[0112] Photoinitiator is not introduced.

[0113] Comparative Example 4

[0114] Comparative Example 4 and Example 1 will be compared. The differences between Comparative Example 4 and Example 1 are as follows:

[0115] Glutaric anhydride is not introduced.

[0116] Comparative Example 5

[0117] Comparative Example 5 and Example 1 will be compared. The differences between Comparative Example 5 and Example 1 are as follows:

[0118] Ferrous chloride is not introduced.

[0119] Related experiments and effect data:

[0120] The ring crush test and water absorption test were respectively carried out on the coated corrugated paper obtained in each example and comparative example, and it was tested whether it was flat on a flattening machine. The results are shown in Table 1.

[0121] Table 1 Test result situation table

[0122]

[0123] As can be seen from Table 1, for the preparation method provided in the embodiments of the present application, by introducing a sizing agent additive including ferrous chloride, photoinitiator, sodium silicate, carboxymethyl cellulose and glutaric anhydride, and then adopting the operation of flattening first and then ultraviolet light curing, a coated corrugated paper material with good strength, hydrophobicity and flatness can be obtained.

[0124] The results of the ring crush test and water absorption test in Example 6 are quite different from those of the other examples. The possible reason is that the water content in the sweet potato starch used is relatively large, and it is difficult to completely gelatinize this type of starch by microwave treatment, thus affecting the improvement of the strength and hydrophobicity of the sizing compound on the coated corrugated paper.

[0125] One or more technical solutions in the embodiments of the present application at least further have the following technical effects or advantages:

[0126] (1) A corrugated paper printing and coating process provided by an embodiment of the present application avoids the situation of high temperature above 100 °C in the traditional coating process. Only ultraviolet light is used for photocuring, and the photocuring time is controlled within 30 s. The process is simple, with low energy consumption and easy operation.

[0127] (2) A corrugated paper printing and coating process provided by an embodiment of the present application can achieve a Cobb value of 30 g / m 2 for the obtained coated corrugated paper, and its transverse ring crush index can reach above 8.5 N·m / g, indicating that this preparation method can effectively improve the hydrophobicity and strength of the coated corrugated paper.

[0128] The various embodiments of the present application may exist in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be construed as a rigid limitation on the scope of the present application; therefore, it should be considered that the range description has specifically disclosed all possible sub-ranges and single values within that range. For example, it should be considered that the range description from 1 to 6 has specifically disclosed sub-ranges such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., and single numbers within that range, such as 1, 2, 3, 4, 5, and 6, regardless of the range. Additionally, whenever a numerical range is indicated herein, it means including any cited number (fraction or integer) within the indicated range.

[0129] In this application, unless otherwise specified, the orientation terms such as "upper" and "lower" specifically refer to the drawing direction in the attached drawings. Additionally, in the description of the specification of this application, the terms "include", "comprise", etc. mean "including but not limited to". In this text, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. In this text, "and / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can mean: A exists alone, A and B exist simultaneously, or B exists alone. Here, A and B can be singular or plural. In this text, "at least one" means one or more, and "multiple" means two or more. "At least one kind", "at least one (item) of the following" or similar expressions refer to any combination of these items, including any combination of single item (s) or plural items (s). For example, "at least one (item) of a, b, or c", or, "at least one (item) of a, b, and c" can both mean: a, b, c, a - b (i.e., a and b), a - c, b - c, or a - b - c, where a, b, and c can be single or multiple respectively.

[0130] The above are only specific embodiments of this application, enabling those skilled in the art to understand or implement this application. Various modifications to these embodiments will be obvious to those skilled in the art. The general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of this application. Therefore, this application will not be limited to these embodiments shown herein, but rather will conform to the broadest scope consistent with the principles and novel features claimed herein.

Claims

1. A corrugated paper printing and laminating process, characterized in that the method Comprising: Mixing gelatinized starch, titanium dioxide powder and a sizing agent additive solution in an inert atmosphere and stirring to obtain a sizing composite agent; Coating the sizing composite agent on the surface of the corrugated paper, paving and leveling the film layer, and then performing photocuring in an ultraviolet light environment to obtain a laminated corrugated paper; Wherein, by weight parts, the raw materials of the sizing agent additive solution include: Ferrous chloride: 10 - 15 parts, photoinitiator: 5 - 10 parts, sodium silicate: 2 - 5 parts, carboxymethyl cellulose: 2 - 5 parts, glutaric anhydride: 1 - 2 parts; The preparation method of the gelatinized starch includes: Dissolving starch in water, adding ammonium sulfate solution to the solution to a preset pH value, and then performing microwave treatment to obtain gelatinized starch; Wherein, the starch includes corn starch and / or potato starch; The preset pH value is 8.5 - 9.0, the frequency of the microwave treatment is 500 kHz - 2000 kHz, and the time of the microwave treatment is 5 min - 10 min.

2. The printing and laminating process according to claim 1, characterized in that The mass ratio of the gelatinized starch, the titanium dioxide powder and the sizing agent additive solution is 50 - 60:15 - 25:10 - 20.

3. The printing and laminating process according to claim 1, characterized in that The solid content of the sizing composite agent is 35% - 45%, and the viscosity is 20 mPa·s - 35 mPa·s.

4. The printing and laminating process according to claim 1, characterized in that The photoinitiator includes at least one of 2-hydroxy-2-methyl-1-(4-methoxy)phenyl-1-propanone, 2-hydroxy-2-methyl-1-(4-hydroxyethoxy)phenyl-1-propanone, and 2-dimethylamino-2-benzyl-1-[4-(4-morpholinyl)phenyl]-1-butanone.

5. The printing and laminating process according to claim 1, characterized in that The titanium dioxide powder includes first particle titanium powder, second particle titanium powder and third particle titanium powder. The particle size of the first particle titanium powder is 10 nm - 15 nm, the particle size of the second particle titanium powder is 15 nm - 20 nm, and the particle size of the third particle titanium powder is 20 nm - 25 nm.

6. The printing and laminating process according to claim 1, characterized in that The wavelength of the ultraviolet light used for photocuring is 365 nm - 395 nm, and the time of photocuring is 20 s - 30 s.

7. The printing and laminating process according to claim 1, characterized in that The temperature of the leveling is 25°C - 27°C.

8. A printed and laminated corrugated paper, characterized in that The laminated corrugated paper is prepared by the printing and laminating process according to any one of claims 1 - 7. The structure of the laminated corrugated paper from the inside to the outside is successively a corrugated paper base plate, a photocured layer and a laminated layer. The thickness ratio of the photocured layer and the laminated layer is 0.5 - 1:1.5.

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