High-pressure-resistant cushion laminated corrugated paperboard and preparation process thereof

Abstract

This invention discloses a high-compression-strength, cushioning-coated corrugated cardboard and its preparation process, belonging to the field of corrugated cardboard preparation technology. The preparation process of the high-compression-strength, cushioning-coated corrugated cardboard includes the following steps: ironing base paper to form corrugations; coating the surface of the corrugations with adhesive, bonding the inner paper to obtain a laminate; spraying a coating liquid onto the surface of the laminate, and drying to obtain the high-compression-strength, cushioning-coated corrugated cardboard; firmly bonding the corrugated base paper with the prepared adhesive liquid, adding anionic emulsifier to make the adhesive film more uniform and stable, improving its compression resistance; adding borax to form a cross-linked network structure, increasing the stress dispersion area and preventing local stress concentration; adding an sizing agent to improve the rigidity of the corrugated cardboard; introducing sodium montmorillonite with cushioning properties into the coating liquid, cross-linking it with Brunei glue and coating it onto the surface of the laminate, which acts as a buffer and disperses the impact force when the corrugated cardboard is subjected to external impact, thereby improving the compression resistance of the corrugated cardboard.

Description

Technical Field

[0001] This invention belongs to the field of corrugated cardboard preparation technology, specifically relating to a high-compression-strength cushioning coated corrugated cardboard and its preparation process. Background Technology

[0002] Corrugated cardboard, through a series of processes such as die-cutting, creasing, stapling, or gluing, can be made into corrugated cartons. As a widely used and in-demand packaging product, this type of carton has long held the top position among various packaging products. Due to its superior performance and processing capabilities, corrugated cartons have gradually replaced wooden crates and other transport packaging containers, becoming the dominant choice for transport packaging. Besides protecting goods and facilitating warehousing and transportation, corrugated cartons also beautify and promote products. More importantly, corrugated cartons are environmentally friendly products, contributing to environmental protection and facilitating loading, unloading, and transportation.

[0003] However, while commercially available corrugated cardboard boxes possess a certain degree of compressive strength, their overall compressive strength is relatively poor. When subjected to external mechanical impact, they may suffer varying degrees of damage, disintegration, or breakage. Therefore, providing a corrugated cardboard with strong and stable compressive strength and its manufacturing process has become a key technical problem urgently needing to be solved by those skilled in the art. Summary of the Invention

[0004] This invention discloses a high-compression-strength, cushioning-coated corrugated cardboard and its preparation process, belonging to the field of corrugated cardboard preparation technology. The preparation process of the high-compression-strength, cushioning-coated corrugated cardboard includes the following steps: ironing base paper to form corrugations; coating the surface of the corrugations with adhesive, bonding the inner paper to obtain a laminate; spraying a coating liquid onto the surface of the laminate, and drying to obtain the high-compression-strength, cushioning-coated corrugated cardboard; firmly bonding the corrugated base paper with the prepared adhesive liquid, adding anionic emulsifier to make the adhesive film more uniform and stable, improving its compression resistance; adding borax to form a cross-linked network structure, increasing the stress dispersion area and preventing local stress concentration; adding an sizing agent to improve the rigidity of the corrugated cardboard; introducing sodium montmorillonite with cushioning properties into the coating liquid, cross-linking it with Brunei glue and coating it onto the surface of the laminate, which acts as a buffer and disperses the impact force when the corrugated cardboard is subjected to external impact, thereby improving the compression resistance of the corrugated cardboard.

[0005] The technical problem to be solved by this invention is to provide a corrugated cardboard with strong and stable pressure resistance and its preparation process.

[0006] The objective of this invention can be achieved through the following technical solutions:

[0007] A high-compression-strength, cushioning-coated corrugated cardboard and its preparation process are disclosed. The preparation process of the high-compression-strength, cushioning-coated corrugated cardboard includes the following steps:

[0008] (1) Take the original paper and iron it to form a corrugated shape;

[0009] (2) Apply adhesive to the surface of the corrugated board and bond the inner paper to obtain the laminate; the amount of adhesive applied is 5-7 g / m². 2 ;

[0010] (3) The coating liquid is sprayed onto the surface of the laminate and dried to obtain the high-compression-strength cushioning coated corrugated cardboard; the coating liquid spraying amount is 4-6 g / m². 2 .

[0011] As a preferred embodiment of the present invention, the preparation of the adhesive includes the following steps:

[0012] (21) Crush rosin, pass it through an 80-100 mesh sieve, place it in a reaction vessel, heat it to 160-170℃, add maleic anhydride, heat it to 180-190℃, react for 2-3 hours, and obtain material A;

[0013] (22) Take the material A, heat it in an oil bath at 130-135℃ for 2-3 hours, introduce it into a reaction vessel, add glycerol and p-toluenesulfonic acid, and heat it to 190-195℃ for 6-8 hours to obtain material B;

[0014] (23) Take the material B and place it in a reaction vessel. Heat it to 150-180℃, add emulsifier OS, sodium dioctyl succinate sulfonate and emulsifier OP-10, stir for 3-5 hours, add deionized water at 80-90℃, add deionized water at 96-98℃ while stirring, and then cool to 30-40℃ to obtain material C.

[0015] (24) Add corn starch to deionized water at 38-42℃ and stir for 0.5-1h to obtain a mixture. Adjust the pH of the mixture to 11-12, add ferrous sulfate and hydrogen peroxide, stir for 0.5-1h, let stand for 1.5-2h, add sodium hydroxide, and stir at 40-45℃ for 2-4h to obtain material D.

[0016] (25) Take deionized water and heat it to 38-42℃, add 5% borax solution, stir for 0.5-1h, add corn starch, stir for 2-4h to obtain material E, add material D to material E, stir for 20-30min, let stand for 15-30min to obtain material F;

[0017] (26) Take the material F, add the material C to the material F, stir for 3-4 minutes, add the sizing agent, stir for 1-2 minutes, heat to 88-92℃ and gelatinize for 30-40 minutes, cool to 50-60℃ to obtain the adhesive solution, and set aside.

[0018] As a preferred embodiment of the present invention, the preparation of the sizing agent includes the following steps:

[0019] Take alkyl ketene dimer, aluminum sulfate and calcium silicate, mix them, grind for 4-6 hours, and pass through a 100-120 mesh sieve to obtain the sizing agent;

[0020] The mass ratio of the alkyl ketene dimer, aluminum sulfate, and calcium silicate is 7-9:1-3:3-4.

[0021] As a preferred embodiment of the present invention, the preparation of the coating solution includes the following steps:

[0022] (31) Dissolve Brunei gum in deionized water and stir for 9-12 hours. Add citric acid and stir for 2-3 hours. Place in an oven and react at 100°C for 3-4 hours. Wash with water until pH equals 7. Dry at room temperature for 24-28 hours to obtain material G.

[0023] (32) Take sodium montmorillonite and deionized water, mix them, and ultrasonically disperse them for 30-40 minutes. Add the material G, heat it to 60°C and stir for 5-8 hours. Add 0.2 mol / L sodium hydroxide solution, adjust the pH to 8.8-9.2, add ethylene glycol diglycidyl ether and glycerol, and stir for 0.5-1 hours to obtain the coating solution.

[0024] As a preferred technical solution of the present invention, in steps (21)-(23), the ratio of rosin, maleic anhydride, glycerol, p-toluenesulfonic acid, emulsifier OS, sodium dioctyl succinate sulfonate, emulsifier OP-10, deionized water at 80-90℃, and deionized water at 96-98℃ is 5-10g: 4-6g: 10-12g: 0.1-0.2g: 0.5-0.6g: 0.15-0.25g: 0.22-0.34g: 100-150mL: 80-100mL.

[0025] As a preferred technical solution of the present invention, in step (24), the ratio of corn starch, deionized water at 38-42℃, ferrous sulfate, hydrogen peroxide and sodium hydroxide is 40-60g: 80-100mL: 0.5-0.7g: 0.15-0.25g: 2-3g.

[0026] As a preferred technical solution of the present invention, in step (25), the ratio of deionized water, borax solution, corn starch and material D is 50-80mL:10mL:20-35g:100mL.

[0027] As a preferred technical solution of the present invention, in step (26), the ratio of material F, material C and sizing agent is 40-60mL: 80-100mL: 5-10g.

[0028] As a preferred technical solution of the present invention, in step (31), the ratio of Brunei gum, deionized water and citric acid is 4-6g: 50-80mL: 1.5-2.5g;

[0029] In step (32), the ratio of sodium montmorillonite, deionized water, material G, ethylene glycol diglycidyl ether, and glycerol is 4-6g:100mL:4-5g:0.5-0.6g:1-2g.

[0030] A high-compression-strength, cushioning-coated corrugated cardboard prepared using the above-described process.

[0031] The beneficial effects of this invention are:

[0032] (1) The high-compression-resistant buffer-coated corrugated cardboard and its preparation process disclosed in this invention firmly bond the corrugated base paper by preparing an adhesive solution and adding an anionic emulsifier to make the adhesive solution more uniform and stable after film formation, thereby improving the stability of the corrugated cardboard and its compressive strength; furthermore, by adding borax to form a cross-linked network structure, the stress dispersion area is increased and local stress concentration is prevented.

[0033] (2) The high compression-resistant cushioning coated corrugated cardboard and its preparation process disclosed in this invention improves the rigidity of the corrugated cardboard by using alkyl ketene dimer, aluminum sulfate and calcium silicate mixed in proportion as sizing agent, thereby improving the compression strength of the corrugated cardboard.

[0034] (3) The high compressive strength buffered coated corrugated cardboard and its preparation process disclosed in this invention introduces sodium montmorillonite with buffering properties into the coating liquid, crosslinks it with Brunei glue and coats it on the surface of the layer board, so as to buffer and disperse the impact force when the corrugated cardboard is subjected to external impact, thereby improving the compressive strength of the corrugated cardboard. Detailed Implementation

[0035] To further illustrate the technical means and effects of the present invention in achieving its intended purpose, the following detailed description of the specific implementation methods, structures, features, and effects of the present invention, in conjunction with embodiments, is provided below.

[0036] Example 1

[0037] The preparation of a high-compression-strength cushioning coated corrugated cardboard includes the following steps:

[0038] (1) Take the original paper and iron it to form a corrugated shape;

[0039] (2) Apply adhesive to the surface of the corrugated board and bond the inner paper to obtain a laminate; the amount of adhesive applied is 5g / m². 2 ;

[0040] (3) The coating liquid is sprayed onto the surface of the laminate and dried to obtain the high-compression-strength cushioning coated corrugated cardboard; the coating liquid spraying amount is 4g / m². 2 .

[0041] The preparation of the adhesive solution includes the following steps:

[0042] (21) Pulverize the rosin, pass it through an 80-mesh sieve, place it in a reaction vessel, heat it to 160°C, add maleic anhydride, heat it to 180°C, react for 2 hours, and obtain material A;

[0043] (22) Take the material A, heat it in an oil bath at 130°C for 2 hours, introduce it into a reaction vessel, add glycerol and p-toluenesulfonic acid, raise the temperature to 190°C and react for 6 hours to obtain material B;

[0044] (23) Take the material B and place it in a reaction vessel. Heat it to 150°C and add emulsifier OS, sodium dioctyl succinate sulfonate and emulsifier OP-10. Stir for 3 hours and add deionized water at 80°C. While stirring, add deionized water at 96°C and then cool to 30°C to obtain material C.

[0045] In steps (21)-(23), the ratio of rosin, maleic anhydride, glycerol, p-toluenesulfonic acid, emulsifier OS, sodium dioctyl succinate sulfonate, emulsifier OP-10, deionized water at 80°C, and deionized water at 96°C is 5g:4g:10g:0.1g:0.5g:0.15g:0.22g:100mL:80mL;

[0046] (24) Add corn starch to deionized water at 38°C and stir for 0.5 h to obtain a mixture. Adjust the pH of the mixture to 11, add ferrous sulfate and hydrogen peroxide, stir for 0.5 h, let stand for 1.5 h, add sodium hydroxide, and stir at 40°C for 2 h to obtain material D. The ratio of corn starch, deionized water at 38°C, ferrous sulfate, hydrogen peroxide and sodium hydroxide is 40 g: 80 mL: 0.5 g: 0.15 g: 2 g.

[0047] (25) Heat deionized water to 38°C, add 5% borax solution, stir for 0.5 h, add corn starch, stir for 2 h to obtain material E, add material D to material E, stir for 20 min, let stand for 15 min to obtain material F; the ratio of deionized water, borax solution, corn starch and material D is 50 mL: 10 mL: 20 g: 100 mL;

[0048] (26) Take the material F, add the material C to the material F, stir for 3 min, add the sizing agent, stir for 1 min, heat to 88℃ and gelatinize for 30 min, cool to 50℃ to obtain the adhesive solution, and set aside; the ratio of the amount of the material F, the material C and the sizing agent is 40 mL: 80 mL: 5 g.

[0049] The preparation of the sizing agent includes the following steps:

[0050] The sizing agent is obtained by mixing alkyl ketene dimer, aluminum sulfate, and calcium silicate, grinding for 4 hours, and passing through a 100-mesh sieve; the mass ratio of the alkyl ketene dimer, aluminum sulfate, and calcium silicate is 7:1:3.

[0051] The preparation of the coating solution includes the following steps:

[0052] (31) Dissolve Brunei gum in deionized water, stir for 9 hours, add citric acid, stir for 2 hours, place in an oven and react at 100°C for 3 hours, wash with water until pH equals 7, and dry at room temperature for 24 hours to obtain material G; the ratio of Brunei gum, deionized water and citric acid is 4g:50mL:1.5g.

[0053] (32) Take sodium montmorillonite and deionized water, mix them, and ultrasonically disperse them for 30 min. Add the material G, heat to 60℃ and stir for 5 h. Add 0.2 mol / L sodium hydroxide solution, adjust the pH to 8.8, add ethylene glycol diglycidyl ether and glycerol, and stir for 0.5 h to obtain the coating solution. The ratio of sodium montmorillonite, deionized water, material G, ethylene glycol diglycidyl ether and glycerol is 4 g: 100 mL: 4 g: 0.5 g: 1 g.

[0054] Example 2

[0055] The preparation of a high-compression-strength cushioning coated corrugated cardboard includes the following steps:

[0056] (1) Take the original paper and iron it to form a corrugated shape;

[0057] (2) Apply adhesive to the surface of the corrugated board and bond the inner paper to obtain a laminate; the amount of adhesive applied is 6g / m². 2 ;

[0058] (3) The coating liquid is sprayed onto the surface of the laminate and dried to obtain the high-compression-strength cushioning coated corrugated cardboard; the coating liquid spraying amount is 5g / m². 2 .

[0059] The preparation of the adhesive solution includes the following steps:

[0060] (21) Pulverize the rosin, pass it through a 90-mesh sieve, place it in a reaction vessel, heat it to 165°C, add maleic anhydride, heat it to 185°C, react for 2.5 hours, and obtain material A;

[0061] (22) Take the material A, heat it in an oil bath at 132°C for 2.5 hours, introduce it into a reaction vessel, add glycerol and p-toluenesulfonic acid, raise the temperature to 192°C and react for 7 hours to obtain material B;

[0062] (23) Take the material B and place it in a reaction vessel. Heat it to 165°C, add emulsifier OS, sodium dioctyl succinate sulfonate and emulsifier OP-10, stir for 4 hours, add deionized water at 85°C, add deionized water at 97°C while stirring, and then cool to 35°C to obtain material C.

[0063] In steps (21)-(23), the ratio of rosin, maleic anhydride, glycerol, p-toluenesulfonic acid, emulsifier OS, sodium dioctyl succinate sulfonate, emulsifier OP-10, deionized water at 85°C, and deionized water at 97°C is 8g:5g:11g:0.15g:0.55g:0.20g:0.28g:130mL:90mL;

[0064] (24) Add corn starch to deionized water at 40°C and stir for 0.8 h to obtain a mixture. Adjust the pH of the mixture to 11.5, add ferrous sulfate and hydrogen peroxide, stir for 0.8 h, let stand for 1.8 h, add sodium hydroxide, and stir at 42°C for 3 h to obtain material D. The ratio of corn starch, deionized water at 40°C, ferrous sulfate, hydrogen peroxide and sodium hydroxide is 50 g: 90 mL: 0.6 g: 0.20 g: 2.5 g.

[0065] (25) Heat deionized water to 40°C, add 5% borax solution, stir for 0.8 h, add corn starch, stir for 3 h to obtain material E, add material D to material E, stir for 25 min, let stand for 25 min to obtain material F; the ratio of deionized water, borax solution, corn starch and material D is 65 mL: 10 mL: 28 g: 100 mL;

[0066] (26) Take the material F, add the material C to the material F, stir for 3.5 min, add the sizing agent, stir for 1.5 min, heat to 90℃ and gelatinize for 35 min, cool to 55℃ to obtain the adhesive solution, and set aside; the ratio of the amount of the material F, the material C and the sizing agent is 50 mL: 90 mL: 8 g.

[0067] The preparation of the sizing agent includes the following steps:

[0068] The sizing agent is obtained by mixing alkyl ketene dimer, aluminum sulfate, and calcium silicate, grinding for 5 hours, and passing through a 110-mesh sieve; the mass ratio of the alkyl ketene dimer, aluminum sulfate, and calcium silicate is 8:2:3.5.

[0069] The preparation of the coating solution includes the following steps:

[0070] (31) Dissolve Brunei gum in deionized water, stir for 10 h, add citric acid, stir for 2.5 h, place in an oven and react at 100 °C for 3.5 h, wash with water until pH equals 7, and dry at room temperature for 26 h to obtain material G; the ratio of Brunei gum, deionized water and citric acid is 5 g: 65 mL: 2.0 g.

[0071] (32) Take sodium montmorillonite and deionized water, mix them, and ultrasonically disperse them for 35 min. Add the material G, heat to 60℃ and stir for 7 h. Add 0.2 mol / L sodium hydroxide solution, adjust the pH to 9.0, add ethylene glycol diglycidyl ether and glycerol, and stir for 0.8 h to obtain the coating solution. The ratio of sodium montmorillonite, deionized water, material G, ethylene glycol diglycidyl ether and glycerol is 5 g: 100 mL: 4.5 g: 0.55 g: 1.5 g.

[0072] Example 3

[0073] The preparation of a high-compression-strength cushioning coated corrugated cardboard includes the following steps:

[0074] (1) Take the original paper and iron it to form a corrugated shape;

[0075] (2) Apply adhesive to the surface of the corrugated board and bond the inner paper to obtain a laminate; the amount of adhesive applied is 7g / m². 2 ;

[0076] (3) The coating liquid is sprayed onto the surface of the laminate and dried to obtain the high-compression-strength cushioning coated corrugated cardboard; the coating liquid spraying amount is 6g / m². 2 .

[0077] The preparation of the adhesive solution includes the following steps:

[0078] (21) Pulverize the rosin, pass it through a 100-mesh sieve, place it in a reaction vessel, heat it to 170°C, add maleic anhydride, heat it to 190°C, react for 3 hours, and obtain material A;

[0079] (22) Take the material A, heat it in an oil bath at 135°C for 3 hours, introduce it into a reaction vessel, add glycerol and p-toluenesulfonic acid, raise the temperature to 195°C and react for 8 hours to obtain material B;

[0080] (23) Take the material B and place it in a reaction vessel. Heat it to 180°C, add emulsifier OS, sodium dioctyl succinate sulfonate and emulsifier OP-10, stir for 5 hours, add deionized water at 90°C, add deionized water at 98°C while stirring, and then cool to 40°C to obtain material C.

[0081] In steps (21)-(23), the ratio of rosin, maleic anhydride, glycerol, p-toluenesulfonic acid, emulsifier OS, sodium dioctyl succinate sulfonate, emulsifier OP-10, deionized water at 90°C, and deionized water at 98°C is 10g:6g:12g:0.2g:0.6g:0.25g:0.34g:150mL:100mL;

[0082] (24) Add corn starch to deionized water at 42°C and stir for 1 hour to obtain a mixture. Adjust the pH of the mixture to 12, add ferrous sulfate and hydrogen peroxide, stir for 1 hour, let stand for 2 hours, add sodium hydroxide, and stir at 45°C for 4 hours to obtain material D. The ratio of corn starch, deionized water at 42°C, ferrous sulfate, hydrogen peroxide, and sodium hydroxide is 60g:100mL:0.7g:0.25g:3g.

[0083] (25) Heat deionized water to 42°C, add 5% borax solution, stir for 1 hour, add corn starch, stir for 4 hours to obtain material E, add material D to material E, stir for 30 minutes, let stand for 30 minutes to obtain material F; the ratio of deionized water, borax solution, corn starch and material D is 80 mL: 10 mL: 35 g: 100 mL;

[0084] (26) Take the material F, add the material C to the material F, stir for 4 min, add the sizing agent, stir for 2 min, heat to 92℃ and gelatinize for 40 min, cool to 60℃ to obtain the adhesive solution, and set aside; the ratio of the amount of the material F, the material C and the sizing agent is 60 mL: 100 mL: 10 g.

[0085] The preparation of the sizing agent includes the following steps:

[0086] The sizing agent is obtained by mixing alkyl ketene dimer, aluminum sulfate, and calcium silicate, grinding for 6 hours, and passing through a 120-mesh sieve; the mass ratio of the alkyl ketene dimer, aluminum sulfate, and calcium silicate is 9:3:4.

[0087] The preparation of the coating solution includes the following steps:

[0088] (31) Dissolve Brunei gum in deionized water, stir for 12 hours, add citric acid, stir for 3 hours, place in an oven and react at 100°C for 4 hours, wash with water until pH equals 7, and dry at room temperature for 28 hours to obtain material G; the ratio of Brunei gum, deionized water and citric acid is 6g:80mL:2.5g.

[0089] (32) Take sodium montmorillonite and deionized water, mix them, and ultrasonically disperse them for 40 min. Add the material G, heat to 60℃ and stir for 8 h. Add 0.2 mol / L sodium hydroxide solution, adjust the pH to 9.2, add ethylene glycol diglycidyl ether and glycerol, and stir for 1 h to obtain the coating solution. The ratio of sodium montmorillonite, deionized water, material G, ethylene glycol diglycidyl ether and glycerol is 6 g: 100 mL: 5 g: 0.6 g: 2 g.

[0090] Comparative Examples 1-3

[0091] The difference from Example 1 lies in the different proportions of emulsifier OS, sodium dioctyl succinate sulfonate, and emulsifier OP-10, as shown in Table 1 below.

[0092] Table 1

[0093] Comparative Example 1 0 0.4 0.47 Comparative Example 2 0.5 0 0.37 Comparative Example 3 0.5 0.37 0

[0094] Comparative Examples 4-6

[0095] The difference from Example 1 lies in the different ratio of the sizing agent, as shown in Table 2 below.

[0096] Table 2

[0097]

[0098]

[0099] Comparative Example 7

[0100] The difference from Example 1 is that borax solution is not added in step (25).

[0101] Comparative Example 8

[0102] The difference from Example 1 lies in the preparation of the coating solution, as detailed below:

[0103] The preparation of a coating solution includes the following steps:

[0104] (31) Dissolve Brunei gum in deionized water, stir for 9 hours, add citric acid, stir for 2 hours, place in an oven and react at 100°C for 3 hours, wash with water until pH equals 7, and dry at room temperature for 24 hours to obtain material G; the ratio of Brunei gum, deionized water and citric acid is 4g:50mL:1.5g.

[0105] (32) Take deionized water and material G and mix them to obtain a coating solution; the ratio of deionized water to material G is 100mL:4g.

[0106] Comparative Example 9

[0107] The difference from Example 1 lies in the preparation of the coating solution, as detailed below:

[0108] The preparation of the coating solution includes the following steps:

[0109] (31) Dissolve Brunei gum in deionized water, stir for 9 hours, add citric acid, stir for 2 hours, place in an oven and react at 100°C for 3 hours, wash with water until pH equals 7, and dry at room temperature for 24 hours to obtain material G; the ratio of Brunei gum, deionized water and citric acid is 4g:50mL:1.5g.

[0110] (32) Take sodium montmorillonite and deionized water, mix them, ultrasonically disperse for 30 min, add the material G, heat to 60℃ and stir for 5 h, add 0.2 mol / L sodium hydroxide solution, adjust the pH to 8.8, add glycerol, stir for 0.5 h to obtain the coating solution; the ratio of sodium montmorillonite, deionized water, material G and glycerol is 4 g: 100 mL: 4 g: 1 g.

[0111] Performance testing

[0112] Edge crush strength test shall be performed in accordance with standard GB / T 6546-1998;

[0113] The corrugated cardboard prepared in Examples 1-3 and Comparative Examples 1-9 were subjected to edge crush strength tests according to the above standards. The test results are shown in Table 3 below.

[0114] Table 3

[0115] Example 1 55.42 Example 2 55.51 Example 3 55.46 Comparative Example 1 53.45 Comparative Example 2 53.21 Comparative Example 3 53.34 Comparative Example 4 52.74 Comparative Example 5 52.81 Comparative Example 6 52.43 Comparative Example 7 51.58 Comparative Example 8 51.15 Comparative Example 9 51.09

[0116] As shown in Table 3, the corrugated cardboard prepared in Examples 1-3 has excellent edge crush strength, which is beneficial to improving the compressive strength of the corrugated cardboard.

[0117] In Comparative Examples 1-3, the different proportions of emulsifier OS, sodium dioctyl succinate sulfonate, and emulsifier OP-10 resulted in unstable film formation of the adhesive, weak bonding, reduced edge crush strength of the corrugated cardboard, and decreased compressive strength of the corrugated cardboard.

[0118] In Comparative Examples 4-6, the different ratios of sizing agents resulted in poor supporting strength of the adhesive film after formation, which reduced the edge crush strength of the corrugated board and consequently decreased its compressive strength.

[0119] In Comparative Example 7, no borax was added for cross-linking, which made the stress of the corrugated cardboard more likely to concentrate when subjected to extrusion, resulting in a decrease in edge crush strength and a decrease in the compressive strength of the corrugated cardboard.

[0120] In Comparative Example 8, the absence of sodium montmorillonite, which has excellent mechanical strength, resulted in a decrease in the edge crush strength of the corrugated cardboard, thus reducing its compressive strength.

[0121] In Comparative Example 9, no crosslinking agent was added, which made the stress of the corrugated cardboard easy to concentrate when subjected to extrusion, resulting in a decrease in edge crush strength and a decrease in the compressive strength of the corrugated cardboard.

[0122] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A process for preparing high-compression-strength cushioning coated corrugated cardboard, characterized in that, The preparation process of the high-compression-strength cushioning coated corrugated cardboard includes the following steps: (1) Take the original paper and iron it to form a corrugated shape; (2) Apply adhesive to the surface of the corrugated board and bond the inner paper to obtain the laminate; (3) Spray the coating liquid onto the surface of the board and dry it to obtain the high compression-resistant cushioning coated corrugated cardboard; The preparation of the adhesive solution includes the following steps: (21) Pulverize the rosin, sieve it, place it in a reaction vessel, heat it, add maleic anhydride, and react it to obtain material A; (22) Take the material A, heat it in an oil bath, introduce it into a reaction vessel, add glycerol and p-toluenesulfonic acid, and heat it to react to obtain material B; (23) Take the material B, place it in a reaction vessel, heat it up, add emulsifier OS, sodium dioctyl succinate sulfonate and emulsifier OP-10, stir, add deionized water at a temperature of 80-90℃, add deionized water at a temperature of 96-98℃ while stirring, and then cool to obtain material C. (24) Add corn starch to deionized water at 38-42℃, stir to obtain a mixture, adjust the pH of the mixture, add ferrous sulfate and hydrogen peroxide, stir, let stand, add sodium hydroxide, stir to obtain material D; (25) Take deionized water and heat it to 38-42℃, add borax solution and stir, add corn starch and stir to obtain material E, add material D to material E, stir and let stand to obtain material F; (26) Take the material F, add the material C to the material F, stir, add the sizing agent, stir, heat to gelatinize, cool, and the adhesive solution is obtained for later use; The preparation of the sizing agent includes the following steps: Take alkyl ketene dimer, aluminum sulfate and calcium silicate, mix them, grind them and sieve them to obtain the sizing agent; The mass ratio of the alkyl ketene dimer, aluminum sulfate, and calcium silicate is 7-9:1-3:3-4; The preparation of the coating solution includes the following steps: (31) Dissolve Brunei gum in deionized water, stir, add citric acid, stir, react at 100℃ for 3-4 h, wash with water, dry, and obtain material G; (32) Take sodium montmorillonite and deionized water, mix them, disperse them by ultrasonication, add the material G, heat and stir, adjust the pH to 8.8-9.2, add ethylene glycol diglycidyl ether and glycerol, stir, and the coating solution is obtained.

2. The preparation process of a high-compression-strength cushioning coated corrugated cardboard according to claim 1, characterized in that, In steps (21)-(23), the ratio of rosin, maleic anhydride, glycerol, p-toluenesulfonic acid, emulsifier OS, sodium dioctyl succinate sulfonate, emulsifier OP-10, deionized water at 80-90℃, and deionized water at 96-98℃ is 5-10g: 4-6g: 10-12g: 0.1-0.2g: 0.5-0.6g: 0.15-0.25g: 0.22-0.34g: 100-150mL: 80-100mL.

3. The preparation process of a high-compression-strength cushioning coated corrugated cardboard according to claim 1, characterized in that, In step (24), the ratio of corn starch, deionized water at 38-42℃, ferrous sulfate, hydrogen peroxide, and sodium hydroxide is 40-60g: 80-100mL: 0.5-0.7g: 0.15-0.25g: 2-3g.

4. The preparation process of a high-compression-strength cushioning coated corrugated cardboard according to claim 1, characterized in that, In step (25), the ratio of deionized water, borax solution, corn starch and material D is 50-80mL: 10mL: 20-35g: 100mL.

5. The preparation process of a high-compression-strength cushioning coated corrugated cardboard according to claim 1, characterized in that, In step (26), the ratio of material F, material C, and sizing agent is 40-60mL: 80-100mL: 5-10g.

6. The preparation process of a high-compression-strength cushioning coated corrugated cardboard according to claim 1, characterized in that, In step (31), the ratio of Brunei gum, deionized water, and citric acid is 4-6g: 50-80mL: 1.5-2.5g; In step (32), the ratio of sodium montmorillonite, deionized water, material G, ethylene glycol diglycidyl ether, and glycerol is 4-6g:100mL:4-5g:0.5-0.6g:1-2g.

7. A high-compression-strength, cushioning-coated corrugated cardboard prepared by the preparation process according to any one of claims 1-6.

Images