A plate for airdrop packaging box

Abstract

The present invention provides a plate material for an airdrop packaging box. The plate material of the present invention uses modified carbon fiber cloth as a skeleton and is filled in a polymer to obtain a composite plate material. The present invention solves the adhesion problem between carbon fiber and polymer and improves impact resistance. The plate material is prepared by the following method: carbon fiber is modified with boric acid and sodium azide, and then woven to obtain carbon fiber mesh cloth; the carbon fiber mesh cloth is immersed in a nitric acid solution containing cobalt nitrate, subjected to electrolytic oxidation treatment, and then alternately stacked with a polymer composite masterbatch containing silica particles, and hot pressed to obtain the airdrop packaging box plate material. The plate material has excellent strength, impact resistance and processing performance, and has good impact resistance and strength when used for airdrop packaging boxes.

Description

Technical Field

[0001] The invention relates to a plate material for an airdrop packaging box. Background Art

[0002] Airdropping supplies is a convenient and fast emergency rescue support program that can quickly respond to rescue needs and buy valuable time, making it a very important strategic support method. However, existing airdrop boxes are mostly made of metal, which is heavy and inconvenient to carry and use. They often require a parachute to ensure a safe landing. However, the presence of the parachute can affect weather and wind, making it impossible to deliver supplies to a specific location, greatly increasing the difficulty of emergency rescue. Some airdrop boxes also use plastic shock-absorbing boxes, but these are only suitable for low-altitude airdrops. Plastic shock-absorbing boxes are not resistant to drops and are not suitable for high-altitude airdrops. Summary of the Invention

[0003] The present invention provides a plate material for an airdrop packaging box. The plate material of the present invention uses modified carbon fiber cloth as a skeleton and is filled in a polymer to obtain a composite plate material. The present invention solves the adhesion problem between carbon fiber and polymer and improves impact strength. The plate material is prepared by the following method: carbon fiber is modified with boric acid and sodium azide, and then woven to obtain carbon fiber mesh cloth; the carbon fiber mesh cloth is immersed in a nitric acid solution containing cobalt nitrate, electrolytically oxidized, and then alternately stacked with a polymer composite masterbatch containing silica particles, and hot pressed to obtain the airdrop packaging box plate material. The plate material has excellent strength, impact resistance and processing performance, and has good impact resistance and strength when used for airdrop packaging boxes.

[0004] A plate material for an airdrop packaging box, wherein the plate material structure is a composite plate material having a modified carbon fiber cloth as a skeleton and filled with a polymer, and the plate material is prepared by the following method, characterized in that it comprises:

[0005] 1) placing the carbon fiber in a vacuum furnace, introducing dichloromethane gas, heating to 1100-1200° C., and keeping the temperature for a predetermined time to obtain purified carbon fiber;

[0006] 2) immersing the carbon fiber obtained in step 1) in a solution containing boric acid and sodium azide, and performing a hydrothermal reaction for a predetermined time to modify the carbon fiber;

[0007] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving; and then weaving the roving to obtain a carbon fiber mesh cloth;

[0008] 4) immersing the carbon fiber mesh in a nitric acid solution containing cobalt nitrate and performing an anodic surface oxidation treatment in an electrolytic cell to obtain a modified carbon fiber mesh;

[0009] 5) Alternately laying PMMA / ABS composite masterbatch, modified carbon fiber mesh, and PMMA / ABS composite masterbatch in a mold, wherein the PMMA / ABS composite masterbatch contains fumed silica, laying several layers, and hot pressing the laid materials to obtain the sheet material for the airdrop packaging box.

[0010] Furthermore, in step 1), the flow rate of the dichloromethane gas is 0.5-1m 3 / s, keep warm for 4-6h and then cool naturally to room temperature, wash with deionized water and dry to obtain purified carbon fiber.

[0011] Furthermore, step 2) is: preparing a mixed solution containing boric acid and sodium azide, the molar ratio of boric acid to sodium azide is 1:1, and the concentration is 0.5-1 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and placing it at a constant temperature of 350-400°C for hydrothermal reaction for 5-10h. The obtained carbon fiber with boron nitride grains on the surface is washed and heated at 300-350°C for 4-6h to obtain modified carbon fiber.

[0012] Furthermore, the linear density of the roving in step 3) is 2000-3000tex.

[0013] Furthermore, step 4) is: adding cobalt nitrate to a nitric acid solution with a concentration of 45wt% to obtain a mixed solution with a cobalt nitrate concentration of 2-3wt%, then immersing the carbon fiber mesh in the mixed solution, performing an anodic surface oxidation treatment in an electrolytic cell, the oxidation voltage is 4.2-4.5V, the treatment time is 10-30min, taking out, washing with deionized water, and drying to obtain a modified carbon fiber mesh.

[0014] Furthermore, the mass proportions of the components in the PMMA / ABS composite masterbatch are: 30-40 parts of polymethyl methacrylate PMMA, 30-40 parts of ABS resin, 5-8 parts of MBS resin, 15-20 parts of fumed silica, 0.5-1 part of maleic anhydride grafted polystyrene, 0.5-0.8 part of polyester grafted modified silicone, and 0.1-0.3 part of oxidized polyethylene wax.

[0015] Furthermore, step 5) is as follows: the hot pressing temperature is 150-200° C., the pressure is 10-15 MPa, and the holding time is 10-360 min.

[0016] Beneficial technical effects of the present invention

[0017] 1) After the carbon fibers are purified, boron nitride is generated in situ through a hydrothermal reaction and then heated and dried to solidify, which can improve the bonding performance between the fibers, so that the resulting roving has better smoothness and toughness, and has higher mechanical properties;

[0018] 2) The carbon fiber mesh is anodic oxidized through an electrolytic process to form oxygen-containing groups on the surface of the carbon fiber, which is beneficial to improve the bonding performance of the carbon fiber and the organic polymer and improve the mechanical properties of the composite board;

[0019] 3) Silica and polyester graft-modified silicone were added to the PMMA / ABS composite masterbatch to improve the scratch resistance and toughness of the PMMA / ABS layer. However, the inventors found that after the addition of silica and polyester graft-modified silicone, the adhesion performance of the PMMA / ABS composite masterbatch and the carbon fiber mesh modified with boron nitride deteriorated. To address this problem, the inventors added cobalt nitrate salt to the electrolysis process. During the anodic oxidation process, the cobalt element partially generated cobalt oxide in situ on the carbon fiber surface, thereby improving the bonding strength between the carbon fiber and the PMMA / ABS composite masterbatch. DETAILED DESCRIPTION

[0020] The present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to these Examples within the scope of the present invention.

[0021] In order to accurately measure the mechanical properties of the composite plate, the process parameters used in the embodiments and comparative examples of the present invention are all uniform values, which should not be understood as limiting the scope of protection of the present invention.

[0022] Example 1

[0023] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0024] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.5 mol / L and the sodium azide concentration is 0.5 mol / L; placing the carbon fiber obtained in step 2 in the mixed solution, and then sealing the reactor and subjecting it to a hydrothermal reaction at a constant temperature of 350° C. for 10 hours to obtain a carbon fiber with boron nitride grains on the surface, washing it, and heating it at 300° C. for 6 hours to obtain a modified carbon fiber;

[0025] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0026] 4) adding cobalt nitrate to a 45 wt % nitric acid solution to obtain a mixed solution having a cobalt nitrate concentration of 2 wt %, immersing the carbon fiber mesh in the mixed solution, performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.2 V for 30 min, removing the mesh, washing with deionized water, and drying to obtain a modified carbon fiber mesh;

[0027] 5) In the mold, PMMA / ABS composite masterbatch, modified carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in sequence, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of modified carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0028] Example 2

[0029] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0030] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 1 mol / L and the sodium azide concentration is 1 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a hydrothermal reaction at 400° C. for 5 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 4 hours to obtain a modified carbon fiber;

[0031] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0032] 4) adding cobalt nitrate to a 45 wt % nitric acid solution to obtain a mixed solution having a cobalt nitrate concentration of 3 wt %, immersing the carbon fiber mesh in the mixed solution, performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.5 V for 30 min, removing the mesh, washing with deionized water, and drying to obtain a modified carbon fiber mesh;

[0033] 5) In the mold, PMMA / ABS composite masterbatch, modified carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in sequence, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of modified carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0034] Example 3

[0035] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0036] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.8 mol / L and the sodium azide concentration is 0.8 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 380° C. for 8 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 5 hours to obtain a modified carbon fiber;

[0037] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0038] 4) adding cobalt nitrate to a 45 wt % nitric acid solution to obtain a mixed solution having a cobalt nitrate concentration of 2.5 wt %, immersing the carbon fiber mesh in the mixed solution, performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.5 V for 20 min, removing the mesh, washing with deionized water, and drying to obtain a modified carbon fiber mesh;

[0039] 5) In the mold, PMMA / ABS composite masterbatch, modified carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in sequence, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of modified carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0040] Comparative Example 1

[0041] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0042] 2) twisting a plurality of purified carbon fibers into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0043] 3) PMMA / ABS composite masterbatch, carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in the mold, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0044] Comparative Example 2

[0045] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0046] 2) twisting a plurality of purified carbon fibers into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0047] 3) PMMA / ABS composite masterbatch, carbon fiber mesh cloth and PMMA / ABS composite masterbatch are alternately laid in the mold, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 0.5 parts of maleic anhydride grafted polystyrene, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of carbon fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0048] Comparative Example 3

[0049] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0050] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.8 mol / L and the sodium azide concentration is 0.8 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 380° C. for 8 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 5 hours to obtain a modified carbon fiber;

[0051] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0052] 4) PMMA / ABS composite masterbatch, carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in the mold, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0053] Comparative Example 4

[0054] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0055] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.8 mol / L and the sodium azide concentration is 0.8 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 380° C. for 8 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 5 hours to obtain a modified carbon fiber;

[0056] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0057] 4) PMMA / ABS composite masterbatch, carbon fiber mesh cloth and PMMA / ABS composite masterbatch are alternately laid in the mold, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 0.5 parts of maleic anhydride grafted polystyrene, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of carbon fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0058] Comparative Example 5

[0059] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0060] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.8 mol / L and the sodium azide concentration is 0.8 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 380° C. for 8 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 5 hours to obtain a modified carbon fiber;

[0061] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0062] 4) immersing the carbon fiber mesh in a 45 wt % nitric acid solution, performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.5 V for 20 min, removing the mesh, washing with deionized water, and drying to obtain a modified carbon fiber mesh;

[0063] 5) In the mold, PMMA / ABS composite masterbatch, modified carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in sequence, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 18 parts of fumed silica, 0.5 parts of maleic anhydride grafted polystyrene, 0.5 parts of polyester grafted modified silicone, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of modified carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0064] Comparative Example 6

[0065] 1) Place the continuous carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 0.5m 3 / s, heated to 1100℃, kept warm for 4h, and then naturally cooled to room temperature, washed with deionized water three times, and dried at 120℃ to obtain purified carbon fibers;

[0066] 2) preparing a mixed solution containing boric acid and sodium azide, wherein the boric acid concentration is 0.8 mol / L and the sodium azide concentration is 0.8 mol / L; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 380° C. for 8 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 350° C. for 5 hours to obtain a modified carbon fiber;

[0067] 3) twisting the plurality of carbon fibers obtained in step 2) into a strand using a stranding machine to obtain a carbon fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a carbon fiber mesh cloth having a mesh size of 0.5 mm;

[0068] 4) immersing the carbon fiber mesh in a 45 wt % nitric acid solution, performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.5 V for 20 min, removing the mesh, washing with deionized water, and drying to obtain a modified carbon fiber mesh;

[0069] 5) In the mold, PMMA / ABS composite masterbatch, modified carbon fiber mesh and PMMA / ABS composite masterbatch are alternately laid in sequence, wherein the mass fractions of each component in the PMMA / ABS composite masterbatch are 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 0.5 parts of maleic anhydride grafted polystyrene, and 0.1 parts of oxidized polyethylene wax, wherein the thickness of each layer of composite masterbatch is 1 mm, and a total of 5 layers of modified carbon fiber mesh and 6 layers of composite masterbatch are laid, and the laid materials are hot pressed at a hot pressing temperature of 200 ° C, a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet material for the airdrop packaging box.

[0070] Experiments and data

[0071] Tensile performance test: Tested according to ISO527-2 standard, with a tensile speed of 5 mm / min.

[0072] Bending performance test: Tested according to ISO178 standard, bending speed is 2mm / min.

[0073] Impact resistance test: Tested according to ISO179 standard, bending speed is 2mm / min

[0074] Interlayer separation deformation index: measures the angle between the extension lines of the two ends of the plate when the interlayer is separated, with a bending speed of 2mm / min

[0075] The test results are shown in Table 1 below:

[0076] Table 1

[0077]

[0078] Comparison of the data of Comparative Examples 1 and 3 and Comparative Examples 2 and 4 shows that the modification of carbon fibers by boron nitride greatly improves the mechanical properties, tensile strength, flexural strength, and impact strength of the composite sheet. Comparative Examples 1-2, Comparative Examples 3-4, and Comparative Examples 5-6 show that the addition of fumed silica and polyester grafted modified silicone significantly further improves the mechanical properties, tensile strength, and flexural strength, but at the same time leads to the occurrence of interlayer separation, resulting in a decrease in impact strength. Comparative Examples 3 and 5 and Comparative Examples 4 and 6 show that anodic oxidation modification can improve the adhesion between carbon fibers and polymers. However, when the polymer contains fumed silica and polyester grafted modified silicone, the improvement effect is not obvious. Comparative Example 5 and the examples of the present application show that the addition of cobalt salt in the anodic oxidation process significantly improves the adhesion between carbon fibers and polymers. The sheet of the present invention has excellent strength, impact resistance, and processing properties.

[0079] Although the present invention has been described in detail through the above preferred embodiments, it should be appreciated that the above description should not be considered as limiting the present invention.

Claims

1. A plate material for an airdrop packaging box, the plate material being prepared by the following method, characterized in that: The method specifically includes: 1) placing the carbon fiber in a vacuum furnace, introducing dichloromethane gas, heating to 1100-1200° C., and keeping the temperature for a predetermined time to obtain purified carbon fiber; 2) preparing a mixed solution containing boric acid and sodium azide in a molar ratio of 1:1; placing the carbon fiber obtained in step 1) in the mixed solution, and then sealing the reactor and subjecting it to a hydrothermal reaction at a constant temperature of 350-400° C. for 5-10 hours. The obtained carbon fiber having boron nitride grains on the surface is washed and heated at 300-350° C. for 4-6 hours to obtain a modified carbon fiber; 3) twisting the plurality of modified carbon fibers obtained in step 2) into one strand using a stranding machine to obtain a carbon fiber roving; The roving is then woven to obtain a carbon fiber mesh; 4) adding cobalt nitrate to a 45 wt % nitric acid solution to obtain a mixed solution having a cobalt nitrate concentration of 2-3 wt %, immersing the carbon fiber mesh in the mixed solution, and performing an anodic surface oxidation treatment in an electrolytic cell at an oxidation voltage of 4.2-4.5 V for a treatment time of 10-30 min. The mesh is then removed, washed with deionized water, and dried to obtain a modified carbon fiber mesh; 5) Alternately laying several layers of PMMA / ABS composite masterbatch and modified carbon fiber mesh in a mold, wherein the PMMA / ABS composite masterbatch contains fumed silica, and hot pressing the laid materials to obtain the sheet material for the airdrop packaging box.

2. The plate according to claim 1, wherein The flow rate of dichloromethane gas in step 1) is 0.5-1m 3 / s, keep warm for 4-6h and then cool naturally to room temperature, wash with deionized water and dry to obtain purified carbon fiber.

3. The plate material according to claim 1, wherein: The linear density of the roving in step 3) is 2000-3000tex.

4. The plate material according to claim 1, wherein The PMMA / ABS composite masterbatch comprises the following raw materials in parts by mass: 30-40 parts of polymethyl methacrylate (PMMA), 30-40 parts of ABS resin, 5-8 parts of MBS resin, 15-20 parts of fumed silica, 0.5-1 part of maleic anhydride grafted polystyrene, 0.5-0.8 part of polyester grafted modified silicone, and 0.1-0.3 part of oxidized polyethylene wax.

5. The plate material according to claim 1, wherein: In step 5), the hot pressing temperature is 200-250° C., the pressure is 10-15 MPa, and the holding time is 60-360 min.

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