A kind of pressure-resistant and deformation-resistant corrugated paperboard and its preparation process

Abstract

The present invention belongs to the technical field of high-strength corrugated paperboard manufacturing, and specifically relates to a pressure-resistant and anti-deformation corrugated paperboard and its preparation process. The present invention uses a hydrophobic adhesive to bond, press and dry the flame-retardant face paper, the first corrugated core paper, the middle paper, the second corrugated core paper, and the inner paper, and the pre-compression-prepared pressure-resistant and anti-deformation corrugated paperboard has excellent flame retardant, pressure-resistant and deformation-resistant properties; the flame-retardant face paper prepared by preparing the core-shell flame retardant modified kraft paper by electrostatic adsorption of ammonium polyphosphate, chitosan and sodium phytate has excellent flame retardant properties; the filler wrapped with calcium carbonate prepared by adding lime emulsion to fly ash and passing carbon dioxide improves the shock absorption and corrosion resistance of plastic corrugated core paper and reduces the weight of the corrugated paperboard; the cationic starch is hydrophobically modified by adding aluminum sulfate, calcium silicate and magnesium sulfate, and then propylene glycol, juniper essential oil and xylitol are added for plasticization, and the prepared hydrophobic adhesive improves the waterproof performance and compressive strength of the corrugated paperboard.

Description

Technical Field

[0001] The invention belongs to the technical field of high-strength corrugated paperboard manufacturing, and specifically relates to a pressure-resistant and deformation-resistant corrugated paperboard and a preparation process thereof. Background Art

[0002] Corrugated cardboard is a non-metallic sandwich structure material, which is made of face paper, corrugated core layer and lining paper bonded by adhesive. It has good load-bearing, cushioning and vibration-proof properties, good processing performance, low cost, wide applicable temperature range and good environmental protection. It is widely used in the production of various packaging boxes, such as electronic products, food, beverages, clothing and other commodities. With the increase of environmental humidity, the moisture absorption rate and moisture content of corrugated boxes are both on the rise, while its compressive strength and bursting strength are on a significant downward trend, which makes corrugated boxes easy to be damaged during packaging and transportation. Therefore, it is necessary to improve the structure and composition of corrugated cardboard to improve its hydrophobicity and anti-deformation ability.

[0003] The Chinese invention patent with publication number CN117966518B discloses a pressure-resistant and anti-deformation corrugated cardboard and its preparation process. Among them, a pressure-resistant and anti-deformation corrugated cardboard is composed of a surface panel, a V-shaped corrugated core, a bottom panel, and an adhesive. Among them, the preparation process of the pressure-resistant and anti-deformation corrugated cardboard is: the components of the adhesive are added, mixed, heated, and stirred in sequence to prepare the adhesive, and then the adhesive is coated on both sides of the V-shaped corrugated core, and the bottom panel and the surface panel are sequentially attached to obtain a pressure-resistant and anti-deformation corrugated cardboard. The pressure-resistant and anti-deformation corrugated cardboard of the invention has the advantages of pressure resistance and good adhesion. However, there is a technical problem in the prior art that the structure and materials of the corrugated cardboard are not further optimized to improve the flame retardant, wear resistance and waterproof properties of the corrugated cardboard. Summary of the invention

[0004] The purpose of the present invention is to provide a pressure-resistant and deformation-resistant corrugated paperboard and a preparation process thereof, so as to solve the technical problem that the structure and materials of the corrugated paperboard have not been further optimized in the prior art to improve the flame retardancy, wear resistance and waterproof performance of the corrugated paperboard.

[0005] In order to achieve the above object, the present invention adopts the following technical solutions: A pressure-resistant and deformation-resistant corrugated paperboard, which is provided with a flame-retardant face paper, a first corrugated core paper, a middle paper, a second corrugated core paper and a lining paper in order from top to bottom; The first corrugated core paper is kraft paper corrugated core paper, the second corrugated core paper is plastic corrugated core paper, and the middle paper and the inner paper are any one or more combinations of kraft paper, linerboard paper, and white paper.

[0006] The thickness of the flame-retardant face paper and the first corrugated core paper is 0.3-0.7 mm, the thickness of the middle paper and the inner paper is 0.2-0.5 mm, and the thickness of the second corrugated core paper is 0.1-0.3 mm.

[0007] The first corrugated core paper has a corrugation height of 1.1-2.0 mm, a corrugation width of 3.0-3.5 mm, and a corrugation number of 87-99 / 300 mm. The second corrugated core paper has a corrugation height of 3.5-4.0 mm, a corrugation width of 6.8-7.9 mm, and a corrugation number of 39-44 / 300 mm.

[0008] Preferably, the method for preparing the flame retardant facial paper comprises the following steps: S11, add 10-20 g of ammonium polyphosphate to 200-500 mL of deionized water, add sodium hydroxide solution dropwise to adjust the pH to 5-6, add chitosan solution dropwise under stirring, and finish adding within 1-2 h, collect solid by centrifugation, wash with deionized water, add to deionized water again, stir and disperse, add sodium phytate aqueous solution dropwise, collect solid by centrifugation, and dry at 40-60° C. to obtain a flame retardant; S12. Dissolve the flame retardant in deionized water, add sodium carboxymethyl cellulose, silicon nitride nanosheets, pentadecyl D-glucoside and polylysine to obtain a glue solution, soak the kraft paper in the glue solution for 1 to 2 hours, and dry it to obtain a flame retardant facial paper.

[0009] Preferably, the chitosan solution in S11 is prepared by completely dissolving 2-10 g of chitosan in 200-300 mL of 0.5-1 wt % acetic acid solution.

[0010] Preferably, the mass ratio of ammonium polyphosphate, chitosan and sodium phytate in S11 is 8-10:1:2-3.

[0011] Preferably, the mass ratio of the flame retardant, sodium carboxymethyl cellulose, silicon nitride nanosheets, pentadecyl D-glucoside and polylysine in S12 is 5~8:1~3:0.1~0.5:1~3:0.5~1.

[0012] Preferably, the method for preparing the plastic corrugated core paper comprises the following steps: S21, dissolving 200-300 g of lime in 1-2 L of deionized water to prepare an emulsion, adding 400-600 g of fly ash powder and 1-5 g of sodium lauryl sulfate, introducing carbon dioxide until the pH of the system is 6.5-7.5, dissolving 40-50 g of zinc stearate in anhydrous ethanol and adding the mixture to the system, reacting at 50-60 ° C for 1-2 h, filtering and collecting the solid, and drying to obtain a modified calcium filler; S22, 100-400 g of modified calcium filler, 500-1000 g of polyethylene resin, 1-5 g of polyethylene wax, 1-5 g of stearic acid, 1-5 g of antioxidant and 1-5 g of antistatic agent are put into a high-speed mixer and mixed to obtain a mixed material; S23, adding the mixed material into a sheet machine, hot pressing and extruding, and cooling to obtain plastic corrugated core paper.

[0013] Preferably, the flow rate of carbon dioxide in S21 is 0.05~0.1m 3 / h.

[0014] Preferably, the antioxidant in S22 is one or more combinations of 168, 1010, and 1098, and the antistatic agent is one or more combinations of B1, B2, and SD100.

[0015] Preferably, in S23, the hot pressing extrusion temperature is 150-170° C., the pressure is 20-30 MPa, and the hot pressing time is 5-20 min.

[0016] A preparation process of pressure-resistant and deformation-resistant corrugated paperboard comprises the following steps: S1, preheating the corrugated paper to 20-40°C, controlling the moisture content to be between 8-10% by a moisture adjustment roller, and pressing the corrugated paper to obtain the first corrugated core paper; S2, coating the first corrugated core paper with a hydrophobic adhesive through a glue coating machine, pressing and drying with the flame-retardant surface paper to obtain a single-sided corrugated board, and then coating the other side of the first corrugated core paper with a hydrophobic adhesive, pressing and drying with the middle paper to obtain a double-sided corrugated board; S3, coating the second corrugated core paper with a hydrophobic adhesive, pressing and drying the second corrugated core paper with the surface of the middle paper of the double-sided corrugated board, and then coating the other side of the second corrugated core paper with a hydrophobic adhesive, pressing and drying the second corrugated core paper with the inner paper, to obtain a rough product of a pressure-resistant and deformation-resistant corrugated board; S4. Pre-compress the rough pressure-resistant and anti-deformation corrugated cardboard to a shrinkage rate of 20-25%, press and cut into specified specifications to obtain pressure-resistant and anti-deformation corrugated cardboard products.

[0017] Preferably, the amount of the hydrophobic adhesive in S2 is 40-60 g / m 2 The pressing pressure is 0.3~0.6MPa and the temperature is 60~80℃.

[0018] Preferably, the amount of the hydrophobic adhesive in S3 is 20-30 g / m 2 The pressing pressure is 0.5~0.9MPa and the temperature is 80~100℃.

[0019] Preferably, the method for preparing the hydrophobic binder comprises the following steps: S31, adding 30-50 g of cationic starch to 150-250 mL of deionized water, and then adding 3-8 g of aluminum sulfate, 2-4 g of calcium silicate and 3-5 g of magnesium sulfate, and stirring to obtain a suspension; S32, raising the temperature of the system to 80-90°C and stirring for 20-30 minutes, adding 3-5 g of propylene glycol, 5-10 g of juniper essential oil and 1-3 g of xylitol, and stirring for another 20-30 minutes to obtain a hydrophobic binder.

[0020] Preferably, the total mass of aluminum sulfate and magnesium sulfate in S31 is 10 g.

[0021] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are: 1. Based on the prior art, the present invention improves the preparation process and composition of corrugated cardboard, and presses the flame-retardant face paper, the first corrugated core paper, the middle paper, the second corrugated core paper, and the lining paper in order from top to bottom to obtain a pressure-resistant and anti-deformation corrugated cardboard. The pre-compression makes the corrugated cardboard improve its buffering and vibration isolation performance, and has excellent flame-retardant, pressure-resistant and deformation-resistant properties.

[0022] 2. The present invention combines ammonium polyphosphate, chitosan and sodium phytate with the core material through electrostatic adsorption to form a stable core-shell structure. The prepared core-shell flame retardant has excellent dispersibility, stability and degradability. Adding sodium carboxymethyl cellulose to the glue makes the glue more viscous. Adding silicon nitride nanosheets can fill the gaps in the facial tissue, thereby improving the mechanical properties and wear resistance of the flame-retardant facial tissue. Adding pentadecyl D-glucoside improves the stability of the glue. Adding polylysine improves the antibacterial properties of the flame-retardant facial tissue.

[0023] 3. The present invention achieves resource recycling and reduces environmental pollution by adding fly ash to lime emulsion and introducing carbon dioxide to obtain a filler wrapped in calcium carbonate. Zinc stearate is added to obtain a modified calcium filler, which increases the interface bonding force between the filler and the resin, so that the obtained plastic corrugated core paper has excellent shock absorption and corrosion resistance, and can reduce the weight of the corrugated board, thereby saving wood and packaging costs.

[0024] 4. The present invention adds aluminum sulfate, calcium silicate and magnesium sulfate to cationic starch for hydrophobic modification, and then adds propylene glycol, juniper essential oil and xylitol for plasticization. The prepared hydrophobic adhesive makes the bonding between the corrugated board and the plastic corrugated core paper more firm, and can improve the waterproof performance and compressive strength of the corrugated board. DETAILED DESCRIPTION

[0025] The technical solutions in the embodiments of the present invention are described clearly and completely below. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0026] The kraft paper, noodle boxboard and white board involved in the embodiments of the present invention are all purchased from Dongguan Youtuo Paper Co., Ltd.; polyethylene resin, model HMA-016, purchased from Dongguan Hongchuang Plastic Co., Ltd.; chitosan, purchased from Jiangsu Baiyao Biotechnology Co., Ltd.; ammonium polyphosphate, purchased from Jiangsu Bosite Chemical Technology Co., Ltd.; cationic starch, model CS-YLO3M, purchased from Guangdong Hongxin Biotechnology Co., Ltd.; pentadecyl D-glucoside, purchased from Xuzhou Yihuiyang New Materials Co., Ltd.; silicon nitride nanosheets, model SS-SL5, purchased from Hangzhou Jikang New Materials Co., Ltd.; fly ash powder, purchased from Shijiazhuang Jucai Mineral Products Co., Ltd.; antioxidants and antistatic agents, all purchased from BASF; sodium phytate, sodium carboxymethyl cellulose, polylysine, sodium dodecyl sulfate, aluminum sulfate, calcium silicate, magnesium sulfate and propylene glycol, all purchased from Merck Chemical.

[0027] Embodiment 1, a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment, wherein a flame-retardant face paper, a first corrugated core paper, a middle paper, a second corrugated core paper and a lining paper are sequentially arranged from top to bottom; The first corrugated core paper is 275g / m 2 The second corrugated core paper is a plastic corrugated core paper, and the middle paper and the inner paper are 300g / m 2 of kraft paper.

[0028] The thickness of the flame-retardant face paper and the first corrugated core paper is 0.3 mm, the thickness of the middle paper and the inner paper is 0.2 mm, and the thickness of the second corrugated core paper is 0.2 mm.

[0029] The first corrugated core paper has a corrugation height of 1.5 mm, a corrugation width of 3.0 mm, and 90 corrugations / 300 mm. The second corrugated core paper has a corrugation height of 3.5 mm, a corrugation width of 7.5 mm, and 40 corrugations / 300 mm.

[0030] The method for preparing the flame retardant facial paper of this embodiment comprises the following steps: S11, add 10g of ammonium polyphosphate to 200mL of deionized water, add sodium hydroxide solution dropwise to adjust the pH to 5, add 200mL of 5g / L chitosan solution dropwise under stirring, and finish dropping in 1-2h, collect the solid by centrifugation, wash with deionized water, add to deionized water again, stir and disperse, add 100mL of 20g / L sodium phytate aqueous solution dropwise, collect the solid by centrifugation, and dry at 60°C to obtain a flame retardant; S12. Dissolve 6 g of flame retardant in deionized water, add 2 g of sodium carboxymethyl cellulose, 0.3 g of silicon nitride nanosheets, 2 g of pentadecyl D-glucoside and 0.5 g of polylysine to obtain a glue solution, soak kraft paper in the glue solution for 2 hours, and dry it to obtain a flame-retardant facial paper.

[0031] The method for preparing the plastic corrugated core paper of this embodiment comprises the following steps: S21, dissolving 200g of lime in 1L of deionized water to prepare an emulsion, adding 400g of fly ash powder and 3g of sodium lauryl sulfate, introducing carbon dioxide until the pH of the system is 7, dissolving 40g of zinc stearate in anhydrous ethanol and adding it to the system, reacting at 60°C for 2h, filtering and collecting the solid, and drying to obtain a modified calcium filler; S22, 200 g of modified calcium filler, 800 g of polyethylene resin, 2 g of polyethylene wax, 2 g of stearic acid, 3 g of 168 type antioxidant and 3 g of SD100 type antistatic agent were put into a high-speed mixer and mixed to obtain a mixed material; S23, adding the mixed material into a sheet machine, hot pressing and extruding, and cooling to obtain plastic corrugated core paper, the hot pressing and extrusion temperature is 150° C., the pressure is 20 MPa, and the hot pressing time is 10 min.

[0032] A preparation process of a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment includes the following steps: S1. After preheating the corrugated paper to 30° C., the water content is controlled to be between 10% by a water adjustment roller, and then corrugated paper is pressed to obtain corrugated core paper; S2, the first corrugated core paper is coated with a hydrophobic adhesive by a glue coating machine, and the amount of the hydrophobic adhesive is 40g / m 2 The first corrugated core paper and the flame retardant surface paper are pressed and dried at a pressing pressure of 0.3 MPa and a temperature of 60°C to obtain a single-sided corrugated board. The other side of the first corrugated core paper is coated with a hydrophobic adhesive and pressed and dried with the middle paper at a pressing pressure of 0.3 MPa and a temperature of 60°C to obtain a double-sided corrugated board. S3, apply hydrophobic adhesive on the second corrugated core paper, the amount of hydrophobic adhesive applied is 20g / m 2 , pressed and dried with the middle paper surface of the double-sided corrugated board, the pressing pressure is 0.5MPa, the temperature is 80℃, and then the other side of the second corrugated core paper is coated with a hydrophobic adhesive, pressed and dried with the inner paper, the pressing pressure is 0.5MPa, the temperature is 80℃, and a pressure-resistant and deformation-resistant corrugated board rough product is obtained; S4. Pre-compress the rough pressure-resistant and anti-deformation corrugated cardboard to a shrinkage rate of 25%, press and cut into specified specifications to obtain pressure-resistant and anti-deformation corrugated cardboard products.

[0033] The preparation method of the hydrophobic binder of this embodiment comprises the following steps: S31, adding 50 g of cationic starch to 250 mL of deionized water, and then adding 5 g of aluminum sulfate, 2 g of calcium silicate and 5 g of magnesium sulfate, and stirring to obtain a suspension; S32, heating the system to 85° C. and stirring for 30 min, adding 5 g of propylene glycol, 6 g of juniper essential oil and 3 g of xylitol, and stirring for another 30 min to prepare a hydrophobic binder.

[0034] Embodiment 2, a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment, wherein a flame-retardant face paper, a first corrugated core paper, a middle paper, a second corrugated core paper and a lining paper are sequentially arranged from top to bottom; The first corrugated medium paper is 125 g / m 2 The second corrugated core paper is a plastic corrugated core paper, and the middle paper and the inner paper are 300 g / m 2 of linerboard.

[0035] The thickness of the flame-retardant face paper and the first corrugated core paper is 0.5 mm, the thickness of the middle paper and the inner paper is 0.35 mm, and the thickness of the second corrugated core paper is 0.1 mm.

[0036] The first corrugated core paper has a corrugation height of 1.1 mm, a corrugation width of 3.0 mm, and 88 corrugations / 300 mm. The second corrugated core paper has a corrugation height of 3.5 mm, a corrugation width of 6.8 mm, and 40 corrugations / 300 mm.

[0037] The method for preparing the flame retardant facial paper of this embodiment comprises the following steps: S11, add 15g of ammonium polyphosphate to 200mL of deionized water, add sodium hydroxide solution dropwise to adjust the pH to 5, add 200mL of 20g / L chitosan solution dropwise under stirring, finish the addition in 1h, collect the solid by centrifugation, wash with deionized water, add to deionized water again, stir and disperse, add 100mL of 20g / L sodium phytate aqueous solution dropwise, collect the solid by centrifugation, and dry at 60°C to obtain a flame retardant; S12. Dissolve 8 g of flame retardant in deionized water, add 1 g of sodium carboxymethyl cellulose, 0.1 g of silicon nitride nanosheets, 1 g of pentadecyl D-glucoside and 0.5 g of polylysine to obtain a glue solution, soak kraft paper in the glue solution for 1 hour, and dry it to obtain a flame-retardant facial paper.

[0038] The method for preparing the plastic corrugated core paper of this embodiment comprises the following steps: S21, dissolving 250g of lime in 1L of deionized water to prepare an emulsion, adding 500g of fly ash powder and 1g of sodium lauryl sulfate, introducing carbon dioxide until the pH of the system is 6.5, dissolving 45g of zinc stearate in anhydrous ethanol and adding it to the system, reacting at 55°C for 1h, filtering and collecting the solid, and drying to obtain a modified calcium filler; S22, putting 100 g of modified calcium filler, 500 g of polyethylene resin, 1 g of polyethylene wax, 1 g of stearic acid, 1 g of an antioxidant mixed with 168 and 1010 in a mass ratio of 1:1 and 1 g of B1 antistatic agent into a high-speed mixer to obtain a mixed material; S23, adding the mixed material into a sheet machine, hot pressing and extruding, and cooling to obtain plastic corrugated core paper, the hot pressing and extrusion temperature is 150° C., the pressure is 20 MPa, and the hot pressing time is 5 min.

[0039] A preparation process of a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment includes the following steps: S1, preheating the corrugated paper to 20°C, controlling the moisture content to between 8% by a moisture adjustment roller, and pressing the corrugated paper to obtain the first corrugated core paper; S2, the first corrugated core paper is coated with a hydrophobic adhesive by a glue coating machine, and the amount of the hydrophobic adhesive is 45g / m 2 , pressed and dried with the flame-retardant face paper to obtain a single-sided corrugated board, and then the other side of the first corrugated core paper was coated with a hydrophobic adhesive, pressed and dried with the middle paper, the pressing pressure was 0.4MPa, the temperature was 60°C, and a double-sided corrugated board was obtained; S3, apply hydrophobic adhesive to the second corrugated core paper, the amount of hydrophobic adhesive applied is 25g / m 2 , pressed and dried with the surface of the middle paper of the double-sided corrugated board, and then coated with a hydrophobic adhesive on the other side of the second corrugated core paper, pressed and dried with the inner paper, the pressing pressure is 0.9MPa, the temperature is 100℃, and a rough product of pressure-resistant and deformation-resistant corrugated board is obtained; S4. Pre-compress the rough pressure-resistant and anti-deformation corrugated cardboard to a shrinkage rate of 20%, press and cut into specified specifications to obtain pressure-resistant and anti-deformation corrugated cardboard products.

[0040] The preparation method of the hydrophobic binder of this embodiment comprises the following steps: S31, adding 40 g of cationic starch to 200 mL of deionized water, and then adding 6 g of aluminum sulfate, 3 g of calcium silicate and 4 g of magnesium sulfate, and stirring to obtain a suspension; S32, heating the system to 80°C and stirring for 20 minutes, adding 3 g of propylene glycol, 5 g of juniper essential oil and 1 g of xylitol, and stirring for another 30 minutes to prepare a hydrophobic binder.

[0041] Embodiment 3, a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment, wherein a flame-retardant face paper, a first corrugated core paper, a middle paper, a second corrugated core paper and a lining paper are sequentially arranged from top to bottom; The first corrugated medium is 300 g / m 2 Kraft paper corrugated core paper, the second corrugated core paper is plastic corrugated core paper, the middle paper and the inner paper are 300 g / m 2 White paper.

[0042] The thickness of the flame-retardant face paper and the first corrugated core paper is 0.7 mm, the thickness of the middle paper and the inner paper is 0.5 mm, and the thickness of the second corrugated core paper is 0.3 mm.

[0043] The first corrugated core paper has a corrugation height of 2.0 mm, a corrugation width of 3.5 mm, and 99 corrugations / 300 mm. The second corrugated core paper has a corrugation height of 4.0 mm, a corrugation width of 7.9 mm, and 44 corrugations / 300 mm.

[0044] The method for preparing the flame retardant facial paper of this embodiment comprises the following steps: S11, add 20g of ammonium polyphosphate to 500mL of deionized water, add sodium hydroxide solution dropwise to adjust the pH to 5, add 70mL of 30g / L chitosan solution dropwise under stirring, add the solution in 2h, collect the solid by centrifugation, wash with deionized water, add to deionized water again, stir and disperse, add 200mL of 20g / L sodium phytate aqueous solution dropwise, collect the solid by centrifugation, and dry at 60°C to obtain a flame retardant; S12. Dissolve 8 g of flame retardant in deionized water, add 3 g of sodium carboxymethyl cellulose, 0.5 g of silicon nitride nanosheets, 3 g of pentadecyl D-glucoside and 1 g of polylysine to obtain glue solution, soak kraft paper in the glue solution for 2 hours, and dry it to obtain flame-retardant facial paper.

[0045] The method for preparing the plastic corrugated core paper of this embodiment comprises the following steps: S21, 300g of lime was dissolved in 2L of deionized water to prepare an emulsion, 600g of fly ash powder and 5g of sodium lauryl sulfate were added, carbon dioxide was introduced until the pH of the system was 7.5, 50g of zinc stearate was dissolved in anhydrous ethanol and added to the system, reacted at 60°C for 2h, the solid was collected by filtration, and dried to obtain a modified calcium filler; S22, 400 g of modified calcium filler, 1000 g of polyethylene resin, 5 g of polyethylene wax, 5 g of stearic acid, 5 g of 1098 antioxidant and 5 g of B2 antistatic agent were put into a high-speed mixer and mixed to obtain a mixed material; S23, adding the mixed material into a sheet machine, hot pressing and extruding, and cooling to obtain plastic corrugated core paper, the hot pressing and extrusion temperature is 170° C., the pressure is 30 MPa, and the hot pressing time is 5 min.

[0046] A preparation process of a pressure-resistant and deformation-resistant corrugated paperboard of this embodiment includes the following steps: S1, preheating the corrugated paper to 40°C, controlling the moisture content to between 10% by a moisture adjustment roller, and pressing the corrugated paper to obtain corrugated core paper; S2. Apply hydrophobic adhesive to the corrugated core paper through a glue coating machine. The amount of hydrophobic adhesive applied is 60g / m 2 , pressed and dried with flame-retardant face paper to obtain single-sided corrugated board, and then the other side of the corrugated core paper is coated with hydrophobic adhesive, pressed and dried with the middle paper, the pressing pressure is 0.6MPa, the temperature is 80℃, and double-sided corrugated board is obtained; S3, apply hydrophobic adhesive to the plastic corrugated core paper, the amount of hydrophobic adhesive applied is 30g / m 2 , pressed and dried with the surface of the middle paper of the double-sided corrugated cardboard, and then coated with a hydrophobic adhesive on the other side of the plastic corrugated core paper, pressed and dried with the inner paper, the pressing pressure is 0.8MPa, the temperature is 90℃, and the pressure-resistant and deformation-resistant corrugated cardboard rough product is obtained; S4. Pre-compress the rough pressure-resistant and anti-deformation corrugated cardboard to a shrinkage rate of 25%, press and cut into specified specifications to obtain pressure-resistant and anti-deformation corrugated cardboard products.

[0047] The preparation method of the hydrophobic binder of this embodiment comprises the following steps: S31, adding 30 g of cationic starch to 200 mL of deionized water, and then adding 7 g of aluminum sulfate, 4 g of calcium silicate and 3 g of magnesium sulfate, and stirring to obtain a suspension; S32, heating the system to 85°C and stirring for 30 minutes, adding 5 g of propylene glycol, 10 g of juniper essential oil and 3 g of xylitol, and stirring for another 30 minutes to prepare a hydrophobic binder.

[0048] Comparative Example 1: The difference between this comparative example and Example 1 is that no flame retardant is added to the facial paper.

[0049] Comparative Example 2: The difference between this comparative example and Example 1 is that the crude corrugated cardboard is pre-compressed to a shrinkage rate of 5%.

[0050] Comparative Example 3: The difference between this comparative example and Example 1 is that the amount of the hydrophobic adhesive applied is replaced with 10 g / m 2 .

[0051] Performance Testing The edge compression strength of the corrugated board of each embodiment and comparative example was tested according to GB / T 6546-1998 “Determination of edge compression strength of corrugated board”.

[0052] The puncture strength of the corrugated paperboards of the embodiments and comparative examples was tested according to GB / T 2679.7-2005 “Determination of puncture strength of paperboard”.

[0053] The ring crush strength of the corrugated paperboards of the embodiments and comparative examples was tested according to GB / T 2679.8-2016 “Determination of the Ring Crush Strength of Paper and Paperboard”.

[0054] The bonding strength of the corrugated boards of the embodiments and comparative examples was tested according to GB / T6548-2011 “Determination of bonding strength of corrugated board”.

[0055] The test results are shown in Table 1 below: Table 1

[0056] The water absorption of the corrugated paperboards in the embodiments and comparative examples was tested according to GB / T 1540-2002 “Determination of water absorption of paper and paperboard—Cobber method”.

[0057] The limiting oxygen index of the corrugated paperboards of the embodiments and comparative examples was tested according to GB / T5454-1997 “Oxygen Index Method for Combustion Performance Test of Textiles”.

[0058] The test results are shown in Table 2 below:

[0059] It can be seen from the data in the above table that the edge compression strength of the corrugated cardboards prepared in Examples 1 to 3 is between 5.6 and 5.8 kN / m, the puncture strength is between 1340 and 1360 kPa, and the ring compression strength is between 5.2 and 5.3 kN / m, indicating that the corrugated cardboards prepared in the present invention have excellent pressure resistance and anti-deformation performance; the bonding strength of the corrugated cardboards prepared in Examples 1 to 3 is 680 N / m, and the water absorption is 6.8 to 7.1 g / m 2 The results show that the corrugated paperboard prepared by the present invention has excellent bonding and hydrophobic properties; the amount of the hydrophobic adhesive in comparative example 3 is replaced with 10 g / m 2 The contact surface between the corrugated core paper and the hydrophobic adhesive is small, and an effective hydrophobic film cannot be formed. Therefore, the bonding strength and water absorption are significantly lower than the bonding strength of the embodiment, and its edge compression strength, puncture strength and ring compression strength are also significantly reduced; the limiting oxygen index of the corrugated paperboard prepared in Examples 1 to 3 is between 29 and 32%, indicating that the corrugated paperboard prepared in the present invention has excellent flame retardant properties.

[0060] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes according to the technical scheme and inventive concept of the present invention within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

[0061] The preferred embodiments of the present invention disclosed above are only used to help explain the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to only specific implementation methods. Obviously, many modifications and changes can be made according to the content of this specification. This specification selects and specifically describes these embodiments in order to better explain the principles and practical applications of the present invention, so that those skilled in the art can understand and use the present invention well. The present invention is limited only by the claims and their full scope and equivalents.

Claims

1. A pressure-resistant and anti-deformation corrugated paperboard, characterized in that: The flame retardant face paper, the first corrugated core paper, the middle paper, the second corrugated core paper and the inner paper are arranged in sequence from top to bottom; The first corrugated core paper is kraft paper corrugated core paper, the second corrugated core paper is plastic corrugated core paper, and the middle paper and the inner paper are any one or more combinations of kraft paper, linerboard paper, and white paper.

2. The pressure-resistant and deformation-resistant corrugated paperboard according to claim 1, characterized in that: The thickness of the flame-retardant face paper and the first corrugated core paper is 0.3-0.7 mm, the thickness of the middle paper and the inner paper is 0.2-0.5 mm, and the thickness of the second corrugated core paper is 0.1-0.3 mm; the flute height of the first corrugated core paper is 1.1-2.0 mm, the flute width is 3.0-3.5 mm, and the number of flutes is 87-99 / 300 mm; the flute height of the second corrugated core paper is 3.5-4.0 mm, the flute width is 6.8-7.9 mm, and the number of flutes is 39-44 / 300 mm.

3. The pressure-resistant and deformation-resistant corrugated paperboard according to claim 1, characterized in that: The method for preparing the flame retardant facial paper comprises the following steps: S11, add 10-20 g of ammonium polyphosphate to 200-500 mL of deionized water, add sodium hydroxide solution dropwise to adjust the pH to 5-6, add chitosan solution dropwise under stirring, and finish adding within 1-2 h, collect solid by centrifugation, wash with deionized water, add to deionized water again, stir and disperse, add sodium phytate aqueous solution dropwise, collect solid by centrifugation, and dry at 40-60° C. to obtain a flame retardant; S12. Dissolve the flame retardant in deionized water, add sodium carboxymethyl cellulose, silicon nitride nanosheets, pentadecyl D-glucoside and polylysine to obtain a glue solution, soak the kraft paper in the glue solution for 1 to 2 hours, and dry it to obtain a flame retardant facial paper.

4. The pressure-resistant and deformation-resistant corrugated paperboard according to claim 3, characterized in that: The chitosan solution in S11 is prepared by completely dissolving 2-10 g of chitosan in 200-300 mL of 0.5-1 wt % acetic acid solution; the mass ratio of ammonium polyphosphate, chitosan and sodium phytate in S11 is 8-10:1:2-3; the mass ratio of flame retardant, sodium carboxymethyl cellulose, silicon nitride nanosheets, pentadecyl D-glucoside and polylysine in S12 is 5-8:1-3:0.1-0.5:1-3:0.5-1.

5. The pressure-resistant and deformation-resistant corrugated paperboard according to claim 1, characterized in that: The method for preparing the plastic corrugated core paper comprises the following steps: S21, dissolving 200-300 g of lime in 1-2 L of deionized water to prepare an emulsion, adding 400-600 g of fly ash powder and 1-5 g of sodium lauryl sulfate, introducing carbon dioxide until the pH of the system is 6.5-7.5, dissolving 40-50 g of zinc stearate in anhydrous ethanol and adding the mixture to the system, reacting at 50-60 ° C for 1-2 h, filtering and collecting the solid, and drying to obtain a modified calcium filler; S22, 100-400 g of modified calcium filler, 500-1000 g of polyethylene resin, 1-5 g of polyethylene wax, 1-5 g of stearic acid, 1-5 g of antioxidant and 1-5 g of antistatic agent are put into a high-speed mixer and mixed to obtain a mixed material; S23, adding the mixed material into a sheet machine, hot pressing and extruding, and cooling to obtain plastic corrugated core paper.

6. The pressure-resistant and deformation-resistant corrugated paperboard according to claim 1, characterized in that: The flow rate of carbon dioxide in S21 is 0.05~0.1m 3 / h; the antioxidant in S22 is one or more combinations of 168, 1010, 1098, and the antistatic agent is one or more combinations of B1, B2, SD100; the hot pressing extrusion temperature in S23 is 150~170℃, the pressure is 20~30MPa, and the hot pressing time is 5~20min.

7. A process for preparing pressure-resistant and deformation-resistant corrugated paperboard, characterized in that: The steps include: S1, preheating the corrugated paper to 20-40°C, controlling the moisture content to be between 8-10% by a moisture adjustment roller, and pressing the corrugated paper to obtain the first corrugated core paper; S2, coating the first corrugated core paper with a hydrophobic adhesive through a glue coating machine, pressing and drying with the flame-retardant surface paper to obtain a single-sided corrugated board, and then coating the other side of the first corrugated core paper with a hydrophobic adhesive, pressing and drying with the middle paper to obtain a double-sided corrugated board; S3, coating the second corrugated core paper with a hydrophobic adhesive, pressing and drying the second corrugated core paper with the surface of the middle paper of the double-sided corrugated board, and then coating the other side of the second corrugated core paper with a hydrophobic adhesive, pressing and drying the second corrugated core paper with the inner paper, to obtain a rough product of a pressure-resistant and deformation-resistant corrugated board; S4. Pre-compress the rough pressure-resistant and anti-deformation corrugated cardboard to a shrinkage rate of 20-25%, press and cut into specified specifications to obtain pressure-resistant and anti-deformation corrugated cardboard products.

8. The process for preparing a pressure-resistant and deformation-resistant corrugated paperboard according to claim 7, characterized in that: The amount of the hydrophobic adhesive in S2 is 40-60 g / m 2 The pressing pressure is 0.3~0.6MPa and the temperature is 60~80℃; the amount of the hydrophobic adhesive in S3 is 20~30g / m 2 The pressing pressure is 0.5~0.9MPa and the temperature is 80~100℃.

9. The process for preparing a pressure-resistant and deformation-resistant corrugated paperboard according to claim 7, characterized in that: The preparation method of the hydrophobic binder comprises the following steps: S31, adding 30-50 g of cationic starch to 150-250 mL of deionized water, and then adding 3-8 g of aluminum sulfate, 2-4 g of calcium silicate and 3-5 g of magnesium sulfate, and stirring to obtain a suspension; S32, raising the temperature of the system to 80-90°C and stirring for 20-30 minutes, adding 3-5 g of propylene glycol, 5-10 g of juniper essential oil and 1-3 g of xylitol, and stirring for another 20-30 minutes to obtain a hydrophobic binder.

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