High-strength composite corrugated board and preparation process thereof

Abstract

The high-strength composite corrugated board is characterized by comprising an inner paper layer, a flexible composite layer, an adhesive paper layer, a paper core, a buffer foam board, a reinforced composite layer and a surface paper layer which are sequentially arranged from top to bottom, the upward waveform of the paper core is of a parabola-shaped top structure, and the downward waveform of the paper core is of a triangular vertex angle structure. The corrugated board has the beneficial effects that the compression resistance and the strength of the outer side and the stress buffering performance of the inner side are guaranteed, the overall strength and the bending resistance of the corrugated board are enhanced, the bonding strength is guaranteed by providing a new formula of the flame-retardant polyurethane foam and the waterproof polyurethane adhesive and a combined use method, and the service life of the corrugated board is prolonged. The toughness and the buffering effect are enhanced, the toughness and the pressure bearing capacity of the paperboard are enhanced, and meanwhile the excellent waterproof and flame-retardant effects are guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of corrugated paperboard and preparation related thereto, in particular to a high-strength composite corrugated paperboard and a preparation process thereof. Background Art

[0002] Since corrugated cardboard has good pressure resistance and cushioning properties, it is widely used in the packaging of various industrial products and civilian goods, mainly used to make cartons, cardboard sandwiches and other packaging materials for fragile goods. The original cardboard similar to yellow cardboard is made by beating the indigenous straw pulp and waste paper, and then machined to make it corrugated, and then bonded with the boxboard paper with adhesives such as sodium silicate on its surface. Corrugated cardboard is a multi-layer adhesive body, which consists of at least one layer of corrugated core paper and one layer of cardboard. It has good elasticity and extensibility, can withstand collisions and falls during transportation, and is mainly used for the outer packaging of fruits and vegetables, home appliances, and fragile goods.

[0003] Corrugated paper is mainly made of fiber raw materials. Corrugated cardboard itself is made of paper and is easy to absorb moisture. If it encounters a humid environment during transportation, the cardboard will absorb water, resulting in a significant reduction in its strength, and may even deform, soften or lose its support capacity. Although corrugated cardboard has a certain degree of compression resistance, it may deform when it is pressed by heavy objects or stacked for a long time during long-distance transportation, especially when the stacking is uneven or the load exceeds its tolerance range. Corrugated cardboard is susceptible to severe impact or scratches during transportation, especially when there is no reinforcement protection. If the packaging is not designed properly or the collision during transportation is too severe, the corrugated cardboard will be damaged or torn. During long-term transportation, especially when the goods are stacked, the corrugated cardboard is easily squeezed, causing it to deform and affect the protection effect. Even without external moisture, the simple pressure can cause it to lose its original shape during transportation. In order to improve the strength of corrugated cardboard, it is sometimes necessary to increase its thickness or density, but this will also increase its weight. This may affect the transportation cost, especially in long-distance transportation, where overweight packaging will increase transportation costs. Ordinary corrugated cardboard lacks waterproof function. If it is exposed to water or high humidity for a long time, the surface of the cardboard will be easily damaged and the corrugated structure will also be affected. The anti-seismic performance of corrugated cardboard is relatively weak. In long-distance transportation, especially when passing through uneven roads or vibrations generated during transportation, the structure of the cardboard will be affected. For fragile, valuable or special-shaped items, ordinary corrugated cardboard lacks buffering capacity and may not be able to fully absorb impact or disperse pressure. Summary of the invention

[0004] In view of the many deficiencies of the above conventional corrugated paperboard, the present invention aims to provide a corrugated paperboard with strong buffering capacity, good elasticity, strong compressive resistance and corresponding flame retardant and waterproof functions. Through structural optimization and the combined effect of a new adhesive and a polyurethane foam formula, the strength of the corrugated paperboard is increased with a small increase and thickness, and through excellent waterproof and flame retardant properties, a certain buffering capacity is provided for the goods, and the safety during transportation is effectively guaranteed, the service life of the corrugated paper box is increased, and the transportation cost is saved. The technical solution of the present invention is as follows:

[0005] A high-strength composite corrugated paperboard comprises a lining paper layer, a flexible composite layer, an adhesive paper layer, a paper core, a buffer foam board, a waterproof composite layer and a surface paper layer which are sequentially arranged from top to bottom; the upward waveform of the paper core is a parabolic top structure, the downward waveform of the paper core is a triangular vertex structure, the two sides of the triangular vertex structure are staggered and arranged in a tangent state to the two side lines of the parabola, the upper surface of the buffer foam board is provided with a plurality of protrusions, the inner concave part of the parabola matches and is fitted with the protrusions on the buffer foam board; the waterproof composite layer is a composite layer of waterproof adhesive and fiber mesh cloth;

[0006] The buffer foam board is a flame-retardant polyurethane foam material prepared from polyurethane foam, and its mass components include 30-40 parts of polyether diol, 10-15 parts of polyether triol, 20-30 parts of toluene diisocyanate TDI, 5-10 parts of diphenylmethane diisocyanate MDI, 5-10 parts of melamine phosphate, 5-10 parts of decabromodiphenyl ether, 3-5 parts of triisopropylphenyl phosphate, 1-2 parts of foaming agent water, 1-3 parts of catalyst triethanolamine, 1-3 parts of surfactant, 1-2 parts of plasticizer chlorinated paraffin, and 1-3 parts of cross-linking agent.

[0007] The waterproof adhesive comprises component A:

[0008] 15-20 parts of polycaprolactone, 20-30 parts of diphenylmethane diisocyanate MDI, 15-20 parts of toluene diisocyanate TDI, 2-3 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 1-2 parts of thickener, 5-10 parts of nano titanium dioxide powder, 10-15 parts of talc, and 10-15 parts of cyclohexane;

[0009] Component B:

[0010] 60-70 parts of 2,5-cyclohexanediamine, 20-30 parts of diethyltoluenediamine, 10-15 parts of polyether diol, 1-2 parts of catalyst, 1-2 parts of stabilizer fluoride, and 1-2 parts of calcium acetate.

[0011] Furthermore, the inner paper layer, the surface paper layer and the adhesive paper are all made of kraft paper.

[0012] Furthermore, the fiber mesh cloth in the reinforced composite layer is a glass fiber mesh cloth.

[0013] Furthermore, the composite material in the flexible composite layer is non-woven fabric.

[0014] Furthermore, the crosslinking agent in the flame retardant polyurethane foam component is tetrahydrofurfuryl alcohol (THFA).

[0015] Furthermore, the catalyst of component B of the waterproof adhesive is dibutyltin dilaurate catalyst DBTDL-12.

[0016] Furthermore, the stabilizer fluoride used in the waterproof adhesive component B is trifluoropropyltriethoxysilane.

[0017] Furthermore, the thickener used in component A of the waterproof adhesive is hydrogenated rosin.

[0018] Furthermore, the surfactant used in the flame retardant polyurethane foam is the siloxane surfactant L-6200.

[0019] A preparation process of high-strength composite corrugated paperboard comprises the following steps:

[0020] S1. Material preparation

[0021] Prepare the base paper, non-woven fabric, glass fiber mesh cloth corresponding to the lining paper, face paper and adhesive paper, and prepare the configuration materials of waterproof adhesive and flame-retardant polyurethane foam according to the formula components;

[0022] S2. Material Pretreatment

[0023] Prepare a paper core, and prepare a corresponding buffer foam board according to the structure size of the paper core using a flame retardant polyurethane foam formula; prepare a waterproof adhesive according to a waterproof adhesive formula;

[0024] S3. Multilayer Composite

[0025] Compounding the buffer foam board with the paper core through a waterproof adhesive, compounding a layer of adhesive paper on the other side of the paper core through a waterproof adhesive, compounding a layer of non-woven fabric on the other side of the adhesive paper through a waterproof adhesive, and further compounding the inner paper on the surface of the non-woven fabric through a waterproof adhesive, compounding the glass fiber mesh cloth behind the buffer foam board through a waterproof adhesive, and then compounding a layer of outer paper on the outer side of the glass fiber mesh cloth to obtain the target product;

[0026] S4. Drying

[0027] Hot air drying to control the moisture content of the cardboard;

[0028] S5. Detection

[0029] Carry out corresponding tests on the performance of the paperboard through the testing device;

[0030] S6. Cut

[0031] Cut the produced cardboard into suitable size and structure;

[0032] S7. Storage

[0033] The cut cardboard is stored in the warehouse.

[0034] The beneficial effects of the present invention are as follows: 1. The buffer layer of the present invention ensures the compressive strength and strength of the outer side and the buffering performance of the inner side through the unique configuration structure, the flexible composite layer and the waterproof composite layer. The strength bearing capacity of the corrugated paper core is improved by filling with elastic polyurethane foam, thereby enhancing the overall strength and bending resistance of the corrugated paperboard; 2. The present invention ensures the bonding strength by providing a new flame-retardant polyurethane foam and a waterproof polyurethane adhesive formula and a combined use method, and further enhances the toughness and pressure bearing capacity of the paperboard through toughness and buffering effect in combination with its own physical properties, while ensuring excellent waterproof and flame-retardant effects; 3. The present invention strengthens the internal buffering capacity, increases the strength of the outer layer, prevents scratches and extrusion deformation, overcomes external defects and solves the lack of internal buffering capacity, and strengthens the paperboard in a targeted manner, so that the required strength of the paperboard is correspondingly improved, so that the transportation capacity of the paperboard prepared by the paperboard is improved, and the durability is also correspondingly obtained. At the same time, it can be used multiple times and still has sufficient strength, saving transportation costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a schematic diagram of the structure of the corrugated paperboard of the present invention;

[0036] In the figure: 1- inner paper layer, 2- flexible composite layer, 3- adhesive paper layer, 4- paper core, 5- buffer foam board, 6- waterproof composite layer, 7- surface paper layer. DETAILED DESCRIPTION

[0037] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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.

[0038] Combination Figure 1 Shown:

[0039] A high-strength composite corrugated paperboard comprises a lining paper layer 1, a flexible composite layer 2, an adhesive paper layer 3, a paper core 4, a buffer foam board 5, a waterproof composite layer 6 and a surface paper layer 7 which are arranged in sequence from top to bottom; the upward waveform of the paper core 4 is a parabolic top structure, the downward waveform of the paper core 4 is a triangular vertex structure, the two sides of the triangular vertex structure are tangent to the two sides of the parabola and are staggered and connected, the upper surface of the buffer foam board is provided with a plurality of protrusions, the inner concave part of the parabola matches and fits with the protrusions on the buffer foam board; the waterproof composite layer 6 is a composite layer of a waterproof adhesive and a fiber mesh cloth;

[0040] The reagents used in the present invention are all conventional and standardized commercially available reagents, and there is no limitation on the specific models and types;

[0041] The specific preparation process is as follows:

[0042] S1. Material preparation

[0043] Prepare the base paper corresponding to the inner paper, face paper and adhesive paper, all of which are kraft paper, non-woven fabric (polypropylene PP non-woven fabric, 0.5mm), glass fiber mesh cloth (mesh size 5mm×5mm), and prepare the configuration materials of waterproof adhesive and flame-retardant polyurethane foam according to the formula components;

[0044] Buffer foam board (flame retardant polyurethane foam) M

[0045] Polyether diol, polyether triol, toluene diisocyanate TDI, diphenylmethane diisocyanate MDI, melamine phosphate, decabromodiphenyl ether, triisopropylphenyl phosphate, foaming agent water, catalyst triethanolamine, surfactant siloxane surfactant L6200, plasticizer chlorinated paraffin, crosslinking agent tetrahydrofurfuryl alcohol THFA;

[0046] M1: 30 parts of polyether diol, 10 parts of polyether triol, 20 parts of toluene diisocyanate TDI, 5 parts of diphenylmethane diisocyanate MDI, 5 parts of melamine phosphate, 5 parts of decabromodiphenyl ether, 3 parts of triisopropylphenyl phosphate, 1 part of foaming agent water, 1 part of catalyst triethanolamine, 1 part of surfactant L6200, 1 part of plasticizer chlorinated paraffin, 1 part of cross-linking agent tetrahydrofurfuryl alcohol THFA;

[0047] M2: 40 parts of polyether diol, 15 parts of polyether triol, 30 parts of toluene diisocyanate TDI, 10 parts of diphenylmethane diisocyanate MDI, 10 parts of melamine phosphate, 10 parts of decabromodiphenyl ether, 5 parts of triisopropylphenyl phosphate, 2 parts of foaming agent water, 3 parts of catalyst triethanolamine, 3 parts of surfactant L6200, 2 parts of plasticizer chlorinated paraffin, 1-3 parts of crosslinking agent tetrahydrofurfuryl alcohol THFA;

[0048] Waterproof Adhesive N

[0049] Component A:

[0050] Polycaprolactone, diphenylmethane diisocyanate MDI, toluene diisocyanate TDI, 2,6-di-tert-butyl-4-methylphenol BHT, thickener hydrogenated rosin, nano titanium dioxide powder, talc, cyclohexane;

[0051] Component B:

[0052] 2,5-cyclohexanediamine, diethyltoluenediamine, polyether diol, catalyst dibutyltin dilaurate catalyst DBTDL-12, stabilizer fluoride trifluoropropyltriethoxysilane, calcium acetate;

[0053] N1:

[0054] Component A

[0055] 15 parts of polycaprolactone, 20 parts of diphenylmethane diisocyanate MDI, 15 parts of toluene diisocyanate TDI, 2 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 1 part of thickener hydrogenated rosin, 5 parts of nano titanium dioxide powder, 10 parts of talc, and 10 parts of cyclohexane;

[0056] Component B

[0057] 60 parts of 2,5-cyclohexanediamine, 20 parts of diethyltoluenediamine, 10 parts of polyether glycol, 1 part of catalyst, 1 part of stabilizer fluoride trifluoropropyltriethoxysilane, 1 part of calcium acetate;

[0058] N2:

[0059] Component A

[0060] 20 parts of polycaprolactone, 30 parts of diphenylmethane diisocyanate MDI, 20 parts of toluene diisocyanate TDI, 3 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 2 parts of thickener hydrogenated rosin, 10 parts of nano titanium dioxide powder, 15 parts of talc, and 15 parts of cyclohexane;

[0061] Component B:

[0062] 70 parts of 2,5-cyclohexanediamine, 30 parts of diethyltoluenediamine, 15 parts of polyether glycol, 2 parts of catalyst dibutyltin dilaurate catalyst DBTDL-12, 2 parts of stabilizer fluoride trifluoropropyltriethoxysilane, 2 parts of calcium acetate;

[0063] S2. Material Pretreatment

[0064] Preparation of paper core: The corrugated roller designed according to the paper core structure of the present invention is used to prepare the base paper into the corresponding paper core. For ease of implementation, the height of the paper core is 5 to 10 mm when the present invention is implemented. The height ratio of the parabola and triangular structure of the corrugation can be adjusted according to actual needs. The height ratio adopted in the implementation mode of the present invention is 1:0.5, and the peak width is set to 5 to 10 mm, which is the same as the height of the paper core.

[0065] Preparation of buffer foam board: design corresponding mold according to the size of paper core structure; fully mix polyether diol and polyether triol, add catalyst triethanolamine and surfactant L6200, mix flame retardants such as TDI, MDI, melamine phosphate, decabromodiphenyl ether, triisopropylphenyl phosphate and the like separately, add the mixture obtained twice into the reactor, mix efficiently to ensure that all raw materials can be completely and evenly combined, add plasticizer chlorinated paraffin at the same time, heat the reaction at 60-80°C, control the addition of foaming agent, introduce the generated foam into the mold, spray release agent on the mold surface to prevent foam adhesion, take out the solidified foam from the mold after 30 minutes to 1 hour of curing time, cool at room temperature to ensure that the foam no longer expands and hardens, cut the solidified foam board according to the final foam board size determined by the paper core size, and use thermal cutting tool or mechanical cutting tool to ensure the uniformity of the foam board;

[0066] Preparation of waterproof adhesive:

[0067] Component A: Under dry conditions, add cyclohexane to a beaker. Cyclohexane, as a solvent, can help dissolve certain ingredients and help adjust the viscosity of the adhesive in subsequent steps. According to the required formula ratio, add polycaprolactone to cyclohexane and stir thoroughly to ensure that the polycaprolactone is completely dissolved. Add nano titanium dioxide powder and talcum powder and mix them evenly by ultrasonic to avoid agglomeration. Add antioxidant BHT to component A and stir to ensure its even distribution. Add thickener to adjust the viscosity so that the adhesive reaches the desired consistency. After adding the thickener, continue stirring until it is completely dissolved.

[0068] Preparation of component B

[0069] In a clean container, add polyether diol, which can serve as the basis of the polymer to improve the adhesion of the adhesive. Add 2,5-cyclohexanediamine and diethyltoluenediamine: add 2,5-cyclohexanediamine and diethyltoluenediamine according to the mass component ratio. Both of them act as hardeners to participate in the reaction of the adhesive and play a cross-linking role. Add slowly and mix evenly. Add catalyst DBTDL-12 to accelerate the reaction process and ensure that the cross-linking reaction can proceed smoothly. Add fluoride trifluoropropyl triethoxysilane to component B as a stabilizer to prevent stratification or instability in the finished product. Finally, add calcium acetate, which can help regulate the reaction rate and provide additional stability.

[0070] The prepared component A and component B are mixed according to the formula, and are fully stirred using a high-speed stirrer at 60 to 80° C. to ensure uniform mixing of the two components. The waterproof adhesive N is obtained after reacting for 6 to 8 hours.

[0071] S3. Multilayer Composite

[0072] Composite of cushioning foam board and paper core:

[0073] Apply waterproof adhesive on the surface of the buffer foam board (the raised side), then dock the glued foam board with the corresponding surface of the paper core, ensure that the raised part of the foam board matches the wavy structure of the paper core (such as the parabolic shape), and fit them together. Use hot air drying equipment to dry at 40-60°C for 1 hour to ensure that the waterproof adhesive can be completely cured and enhance the bonding strength between the paper core and the buffer foam board. The parabolic structure of the two-sided structure of the paper core improves the internal buffering capacity, and the triangular structure improves the outer pressure resistance and pressure resistance, and the internal and external coordinated transportation capacity is further improved;

[0074] Composite of paper core and adhesive paper:

[0075] Coat the other side of the paper core with waterproof adhesive to form an adhesive layer, and bond the paper core coated with adhesive to the adhesive paper (kraft paper) to ensure that the two are firmly bonded. Also perform hot air drying at 40-60°C for 1 hour to ensure the curing of the adhesive.

[0076] Composite of adhesive paper and non-woven fabric:

[0077] Coat the other side of the adhesive paper with waterproof adhesive, and then stick the non-woven fabric (polypropylene PP non-woven fabric) to the adhesive paper. The coating of waterproof adhesive ensures that the adhesive paper and the non-woven fabric can be firmly combined. Continue to dry at 40-60℃ for 1 hour under hot air drying conditions;

[0078] Composite of non-woven fabric and lining paper:

[0079] The non-woven fabric coated with waterproof adhesive is compounded with the lining paper (kraft paper), and the lining paper and the non-woven fabric are tightly combined by the waterproof adhesive to form a high-strength composite structure. The hot air drying equipment is also used to ensure that it is dried at 40-60°C for 1 hour to complete this layer of compounding. After being made into a carton, the flexibility is effectively increased, the buffering capacity is improved, the tear resistance is also improved accordingly, and it also has an additional waterproof effect;

[0080] Composite of glass fiber mesh cloth and buffer foam board:

[0081] Apply waterproof adhesive on the back of the buffer foam board, and then stick the fiberglass mesh cloth on the foam board. The fiberglass mesh cloth provides additional reinforcement, increasing the strength and durability of the corrugated board. Continue to apply waterproof adhesive on the outside of the fiberglass mesh cloth, and laminate the face paper (kraft paper) on the outside of the mesh cloth. Continue to dry it for 1 hour by hot air drying. The face paper can provide appearance and additional protection. At the same time, the waterproof adhesive ensures that the face paper and the mesh cloth are firmly bonded to obtain the final product. The waterproof layer formed by the mesh cloth and the waterproof adhesive has the corresponding waterproof ability, which greatly improves the strength of the outer side of the corrugated board, and effectively improves the anti-crack, deformation, and pressure resistance.

[0082] S4. Drying

[0083] The final corrugated cardboard is dried for a period of time at a suitable humidity and temperature. The specific humidity, temperature and drying time are set according to the actual situation to ensure that the moisture content of the corrugated cardboard is controlled within a certain range and does not affect the structural strength;

[0084] S5. Detection

[0085] Use the testing device to test the performance of the paperboard accordingly, and test the corresponding physical and chemical properties according to actual needs;

[0086] S6. Cut

[0087] Cut the produced cardboard into suitable size and structure;

[0088] S7. Storage

[0089] The cut cardboard is stored in the warehouse.

[0090] Example 1

[0091] Other conditions remain unchanged

[0092] M1N1

[0093] M1: 30 parts of polyether diol, 10 parts of polyether triol, 20 parts of toluene diisocyanate TDI, 5 parts of diphenylmethane diisocyanate MDI, 5 parts of melamine phosphate, 5 parts of decabromodiphenyl ether, 3 parts of triisopropylphenyl phosphate, 1 part of foaming agent water, 1 part of catalyst triethanolamine, 1 part of surfactant L6200, 1 part of plasticizer chlorinated paraffin, 1 part of cross-linking agent tetrahydrofurfuryl alcohol THFA;

[0094] N1:

[0095] Component A

[0096] 15 parts of polycaprolactone, 20 parts of diphenylmethane diisocyanate MDI, 15 parts of toluene diisocyanate TDI, 2 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 1 part of thickener hydrogenated rosin, 5 parts of nano titanium dioxide powder, 10 parts of talc, and 10 parts of cyclohexane;

[0097] Component B

[0098] 60 parts of 2,5-cyclohexanediamine, 20 parts of diethyltoluenediamine, 10 parts of polyether glycol, 1 part of catalyst, 1 part of stabilizer fluoride trifluoropropyltriethoxysilane, 1 part of calcium acetate;

[0099] Example 2

[0100] M1N2

[0101] M1: 30 parts of polyether diol, 10 parts of polyether triol, 20 parts of toluene diisocyanate TDI, 5 parts of diphenylmethane diisocyanate MDI, 5 parts of melamine phosphate, 5 parts of decabromodiphenyl ether, 3 parts of triisopropylphenyl phosphate, 1 part of foaming agent water, 1 part of catalyst triethanolamine, 1 part of surfactant L6200, 1 part of plasticizer chlorinated paraffin, 1 part of cross-linking agent tetrahydrofurfuryl alcohol THFA;

[0102] N2:

[0103] Component A

[0104] 20 parts of polycaprolactone, 30 parts of diphenylmethane diisocyanate MDI, 20 parts of toluene diisocyanate TDI, 3 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 2 parts of thickener hydrogenated rosin, 10 parts of nano titanium dioxide powder, 15 parts of talc, and 15 parts of cyclohexane;

[0105] Component B:

[0106] 70 parts of 2,5-cyclohexanediamine, 30 parts of diethyltoluenediamine, 15 parts of polyether glycol, 2 parts of catalyst dibutyltin dilaurate catalyst DBTDL-12, 2 parts of stabilizer fluoride trifluoropropyltriethoxysilane, 2 parts of calcium acetate;

[0107] Example 3

[0108] M2N1

[0109] M2: 40 parts of polyether diol, 15 parts of polyether triol, 30 parts of toluene diisocyanate TDI, 10 parts of diphenylmethane diisocyanate MDI, 10 parts of melamine phosphate, 10 parts of decabromodiphenyl ether, 5 parts of triisopropylphenyl phosphate, 2 parts of foaming agent water, 3 parts of catalyst triethanolamine, 3 parts of surfactant L6200, 2 parts of plasticizer chlorinated paraffin, 1-3 parts of crosslinking agent tetrahydrofurfuryl alcohol THFA;

[0110] N1:

[0111] Component A

[0112] 15 parts of polycaprolactone, 20 parts of diphenylmethane diisocyanate MDI, 15 parts of toluene diisocyanate TDI, 2 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 1 part of thickener hydrogenated rosin, 5 parts of nano titanium dioxide powder, 10 parts of talc, and 10 parts of cyclohexane;

[0113] Component B

[0114] 60 parts of 2,5-cyclohexanediamine, 20 parts of diethyltoluenediamine, 10 parts of polyether glycol, 1 part of catalyst, 1 part of stabilizer fluoride trifluoropropyltriethoxysilane, 1 part of calcium acetate;

[0115] Example 4

[0116] M2N2

[0117] M2: 40 parts of polyether diol, 15 parts of polyether triol, 30 parts of toluene diisocyanate TDI, 10 parts of diphenylmethane diisocyanate MDI, 10 parts of melamine phosphate, 10 parts of decabromodiphenyl ether, 5 parts of triisopropylphenyl phosphate, 2 parts of foaming agent water, 3 parts of catalyst triethanolamine, 3 parts of surfactant L6200, 2 parts of plasticizer chlorinated paraffin, 1-3 parts of crosslinking agent tetrahydrofurfuryl alcohol THFA;

[0118] N2:

[0119] Component A

[0120] 20 parts of polycaprolactone, 30 parts of diphenylmethane diisocyanate MDI, 20 parts of toluene diisocyanate TDI, 3 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 2 parts of thickener hydrogenated rosin, 10 parts of nano titanium dioxide powder, 15 parts of talc, and 15 parts of cyclohexane;

[0121] Component B:

[0122] 70 parts of 2,5-cyclohexanediamine, 30 parts of diethyltoluenediamine, 15 parts of polyether glycol, 2 parts of catalyst dibutyltin dilaurate catalyst DBTDL-12, 2 parts of stabilizer fluoride trifluoropropyltriethoxysilane, 2 parts of calcium acetate;

[0123] The above are several conventional embodiments of the present invention, and those skilled in the art can make adjustments according to actual needs.

[0124] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, the embodiments should be considered exemplary and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations falling within the meaning and scope of the equivalent elements of the claims be included in the invention. Any reference numeral in a claim should not be considered as limiting the claim to which it relates.

[0125] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A high-strength composite corrugated paperboard, characterized in that: It includes an inner paper layer, a flexible composite layer, an adhesive paper layer, a paper core, a buffer foam board, a waterproof composite layer and a surface paper layer arranged in sequence from top to bottom; the upward waveform of the paper core is a parabolic top structure, the downward waveform of the paper core is a triangular vertex structure, the two sides of the triangular vertex structure are staggered and arranged in a tangent state to the two side lines of the parabola, the upper surface of the buffer foam board is provided with a plurality of protrusions, the inner concave part of the parabola matches and fits with the protrusions on the buffer foam board; the waterproof composite layer is a composite layer of waterproof adhesive and fiber mesh cloth; The buffer foam board is a flame-retardant polyurethane foam material prepared from polyurethane foam, and its mass components include 30-40 parts of polyether diol, 10-15 parts of polyether triol, 20-30 parts of toluene diisocyanate TDI, 5-10 parts of diphenylmethane diisocyanate MDI, 5-10 parts of melamine phosphate, 5-10 parts of decabromodiphenyl ether, 3-5 parts of triisopropylphenyl phosphate, 1-2 parts of foaming agent water, 1-3 parts of catalyst triethanolamine, 1-3 parts of surfactant, 1-2 parts of plasticizer chlorinated paraffin, and 1-3 parts of cross-linking agent; The waterproof adhesive comprises component A: 15-20 parts of polycaprolactone, 20-30 parts of diphenylmethane diisocyanate MDI, 15-20 parts of toluene diisocyanate TDI, 2-3 parts of 2,6-di-tert-butyl-4-methylphenol BHT, 1-2 parts of thickener, 5-10 parts of nano titanium dioxide powder, 10-15 parts of talc, and 10-15 parts of cyclohexane; Component B: 60-70 parts of 2,5-cyclohexanediamine, 20-30 parts of diethyltoluenediamine, 10-15 parts of polyether diol, 1-2 parts of catalyst, 1-2 parts of stabilizer fluoride, and 1-2 parts of calcium acetate.

2. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The inner paper layer, the surface paper layer and the adhesive paper are all made of kraft paper.

3. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The fiber mesh cloth in the reinforced composite layer is a glass fiber mesh cloth.

4. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The composite material in the flexible composite layer is non-woven fabric.

5. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The crosslinking agent in the flame retardant polyurethane foam component is tetrahydrofurfuryl alcohol (THFA).

6. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The B component catalyst of the waterproof adhesive is dibutyltin dilaurate catalyst DBTDL-12.

7. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The stabilizer fluoride used in the waterproof adhesive component B is trifluoropropyltriethoxysilane.

8. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The thickener used in component A of the waterproof adhesive is hydrogenated rosin.

9. The high-strength composite corrugated paperboard according to claim 1, characterized in that: The surfactant used in the flame retardant polyurethane foam is siloxane surfactant L-6200.

10. A process for preparing a high-strength composite corrugated paperboard according to any one of claims 1 to 9, characterized in that The following steps are involved: S1. Material preparation Prepare the base paper, non-woven fabric, glass fiber mesh cloth corresponding to the lining paper, face paper and adhesive paper, and prepare the configuration materials of waterproof adhesive and flame-retardant polyurethane foam according to the formula components; S2. Material Pretreatment Prepare a paper core, and prepare a corresponding buffer foam board according to the structure size of the paper core using a flame retardant polyurethane foam formula; prepare a waterproof adhesive according to a waterproof adhesive formula; S3. Multilayer Composite Compounding the buffer foam board with the paper core through a waterproof adhesive, compounding a layer of adhesive paper on the other side of the paper core through a waterproof adhesive, compounding a layer of non-woven fabric on the other side of the adhesive paper through a waterproof adhesive, and further compounding the inner paper on the surface of the non-woven fabric through a waterproof adhesive, compounding the glass fiber mesh cloth behind the buffer foam board through a waterproof adhesive, and then compounding a layer of outer paper on the outer side of the glass fiber mesh cloth to obtain the target product; S4. Drying Hot air drying to control the moisture content of the cardboard; S5. Detection Carry out corresponding tests on the performance of the paperboard through the testing device; S6. Cut Cut the produced cardboard into suitable size and structure; S7. Storage The cut cardboard is stored in the warehouse.

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