An anti-vibration composite panel for air dropping

Abstract

The application provides an anti-seismic composite plate for aerial delivery, which is prepared by the following method: modifying carbon fibers, forming boron nitride grains in situ on the surface of the carbon fibers, twisting the modified carbon fibers and glass fibers into hybrid fiber roving, spinning the hybrid fiber roving to obtain a hybrid fiber grid cloth, alternately stacking the hybrid fiber grid cloth and PA6 / PMMA / ABS composite master batch, and hot-pressing to obtain the aerial delivery box plate, which has excellent strength, impact resistance and anti-seismic performance and can meet the impact resistance and anti-seismic requirements of the aerial delivery box.

Description

TECHNICAL FIELD

[0001] The present application relates to a kind of anti-seismic composite board for air drop. BACKGROUND

[0002] Air-drop supplies as a convenient and fast support type emergency rescue project, can quickly respond to rescue needs, gain valuable time for rescue, is an important strategic support means.But the existing air-drop box is mostly metal material, itself is relatively heavy, is not convenient to carry and use, steel air-drop box is high in strength, but easy to rust, collision is easy to produce spark, heat transfer speed is fast, there is security risk in the storage and transportation of dangerous goods.Wooden air-drop box is low in strength, poor in protective performance, is easy to be worm-eaten and gnawed by mouse, is easy to burn and support;Glass steel material is relatively brittle, poor in low-temperature resistance, is easy to deform when impact, service life is short, and cost performance is low.Plastic air-drop box of blow molding and other process molding, poor in impact resistance, thickening treatment is necessary to improve impact resistance, which will inevitably cause low packaging efficiency and heavy weight. SUMMARY

[0003] The present application provides an anti-seismic composite board for air drop, which is prepared by the following method: modifying carbon fibers, forming boron nitride grains in situ on the surface of the carbon fibers, then twisting the modified carbon fibers and glass fibers into a mixed fiber roving; spinning the roving to obtain a mixed fiber grid cloth; alternately stacking the mixed fiber grid cloth and PA6 / PMMA / ABS composite master batch, and hot pressing to obtain the air-drop box body board, which has excellent strength, impact resistance and shock resistance, and can meet the impact resistance and shock resistance requirements of high-altitude air-drop box body.

[0004] An anti-seismic composite board for air drop, which comprises a mixed fiber grid cloth containing carbon fibers and glass fibers as a skeleton substrate, and a PA6 / PMMA / ABS material compounded with the skeleton, and is prepared by the following method, characterized in that the method specifically comprises:

[0005] 1) modifying carbon fibers to form boron nitride grains in situ on the surface of the carbon fibers;

[0006] 2) twisting a plurality of modified carbon fibers obtained in step 1) and glass fibers into a strand with a stranding machine to obtain a mixed fiber roving; then spinning the roving to obtain a mixed fiber grid cloth;

[0007] 3) alternately laying PA6 / PMMA / ABS composite master batch and modified mixed fiber grid cloth in the mold, wherein the PA6 / PMMA / ABS composite master batch contains a silane coupling agent, and hot pressing the laid material to obtain the anti-seismic composite board for air drop.

[0008] Furthermore, the carbon fiber in step 1) is purified carbon fiber, and the purification process includes placing the carbon fiber in a vacuum furnace, introducing dichloromethane gas at a flow rate of 0.5-1m3 / s, heating to 1100-1200°C, keeping warm for 4-6h, and then naturally cooling to room temperature, washing with deionized water, and drying to obtain purified carbon fiber.

[0009] Furthermore, step 1) is: preparing a mixed solution containing boric acid and sodium azide; placing the purified carbon fiber in the mixed solution, and then sealing the reactor and placing it at a constant temperature of 350-400°C for hydrothermal reaction for 5-10 hours to obtain carbon fiber with boron nitride grains on the surface, washing, and heating at 300-350°C for 4-6 hours to obtain modified carbon fiber.

[0010] Furthermore, in step 2), the mass ratio of the modified carbon fiber to the glass fiber is 7:3-9:1, and the linear density of the roving is 2000-3000tex.

[0011] Furthermore, the PA6 / PMMA / ABS composite masterbatch includes the following raw materials in parts by mass: 30-40 parts of PA6 resin, 30-40 parts of polymethyl methacrylate (PMMA), 30-40 parts of ABS resin, 5-8 parts of MBS resin, 2.5-3 parts of silane coupling agent KH-792, 0.5-1 part of maleic anhydride grafted polystyrene, and 0.1-0.3 part of oxidized polyethylene wax.

[0012] Furthermore, the PA6 / PMMA / ABS composite masterbatch is prepared by the following preparation method:

[0013] (1) Add each component into a high-speed mixer according to the proportion and stir evenly in the high-speed mixer at room temperature;

[0014] (2) The mixed materials are placed in a twin-screw extruder, melt-plasticized, extruded, cooled, and pelletized to obtain PA6 / PMMA / ABS composite masterbatch; the mixing and melting temperature of the twin-screw extruder used is set to 220°C-230°C, and the head temperature is set to 240°C-250°C.

[0015] Furthermore, in step 3), the hot pressing temperature is 200-250° C., the pressure is 10-15 MPa, and the holding time is 60-360 min.

[0016] Beneficial technical effects of the present invention

[0017] 1) Boron nitride particles are generated in situ on the surface of carbon fibers, which can improve the smoothness and toughness of the resulting roving and provide higher mechanical properties. At the same time, the addition of PA6 material to the PMMA / ABS composite masterbatch improves the tensile strength, capriciousness and creep resistance of the sheet.

[0018] 2) The inventors found that after adding PA6, the bonding performance between the composite masterbatch and the modified carbon fiber deteriorated, which easily led to delamination, resulting in cracking and deformation of the plate when impacted, resulting in poor seismic performance. The inventors twisted the carbon fiber and glass fiber into one strand using a stranding machine to obtain a mixed fiber roving, and added a silane coupling agent KH-792 to the masterbatch. By improving the bonding between the glass fiber and PA6 polyester, the bonding between the mixed fiber mesh cloth and the PA6 / PMMA / ABS composite material was improved, thereby improving the seismic performance of the material. DETAILED DESCRIPTION

[0019] 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.

[0020] In order to accurately measure the performance of the product, the same process parameters are used for the modification of carbon fiber and the composition of the composite masterbatch, thereby comparing the effects of different processing steps on product performance. However, the above parameters should not be considered as limitations of the present invention, and those skilled in the art are fully capable of implementing the present invention within other parameter ranges.

[0021] The preparation process of PA6 / PMMA / ABS composite masterbatch used in the embodiment is as follows: each component is added into a high-speed mixer in the proportion of 35 parts of PA6 resin, 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 2.5 parts of silane coupling agent KH-792, 0.5 parts of maleic anhydride grafted polystyrene, and 0.3 parts of oxidized polyethylene wax, and stirred evenly in the high-speed mixer at room temperature; (2) the mixed material is placed in a twin-screw extruder, melt-plasticized, extruded, cooled, and pelletized to obtain PA6 / PMMA / ABS composite masterbatch; the mixing and melting temperature of the twin-screw extruder used is set to 230°C, and the head temperature is 250°C.

[0022] The preparation process of PMMA / ABS composite masterbatch used in the comparative example is as follows: each component is added into a high-speed mixer in the proportion of 35 parts of polymethyl methacrylate PMMA, 35 parts of ABS resin, 6 parts of MBS resin, 2.5 parts of silane coupling agent KH-792, 0.5 parts of maleic anhydride grafted polystyrene, and 0.3 parts of oxidized polyethylene wax, and stirred evenly in the high-speed mixer at room temperature; (2) the mixed material is placed in a twin-screw extruder, and the PMMA / ABS composite masterbatch is obtained by melt plasticization, extrusion, cooling, and pelletizing; the mixing and melting temperature of the twin-screw extruder used is set to 230°C, and the head temperature is 250°C.

[0023] Example 1

[0024] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

[0025] 2) twisting a plurality of modified carbon fibers and glass fibers into a strand using a stranding machine, wherein the mass ratio of the modified carbon fibers to the glass fibers is 7:3, to obtain a mixed fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a mixed fiber mesh cloth having a mesh size of 0.5 mm;

[0026] 3) Alternately laying PA6 / PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0027] Example 2

[0028] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

[0029] 2) twisting a plurality of modified carbon fibers and glass fibers into a strand using a stranding machine, wherein the mass ratio of the modified carbon fibers to the glass fibers is 8:2, to obtain a mixed fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a mixed fiber mesh cloth having a mesh size of 0.5 mm;

[0030] 3) Alternately laying PA6 / PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0031] Example 3

[0032] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

[0033] 2) twisting a plurality of modified carbon fibers and glass fibers into a strand using a stranding machine, wherein the mass ratio of the modified carbon fibers to the glass fibers is 9:1, to obtain a mixed fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a mixed fiber mesh cloth having a mesh size of 0.5 mm;

[0034] 3) Alternately laying PA6 / PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0035] Comparative Example 1

[0036] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

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

[0038] 3) Alternately laying PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0039] Comparative Example 2

[0040] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

[0041] 2) twisting a plurality of modified carbon fibers into a strand using a stranding machine to obtain a fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a fiber mesh cloth having a mesh size of 0.5 mm;

[0042] 3) Alternately laying PA6 / PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0043] Comparative Example 3

[0044] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 ° C, kept warm for 4 hours, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 hour to obtain purified carbon fiber; a mixed solution containing 0.5 mol / L boric acid and 0.5 mol / L sodium azide was prepared; the purified carbon fiber was placed in the mixed solution, and then the reactor was sealed and placed at a constant temperature of 400 ° C for hydrothermal reaction for 5 hours to obtain carbon fiber with boron nitride grains on the surface, washed with deionized water 3 times, dried for 1 hour, and heated at 350 ° C in a vacuum furnace for 4 hours to obtain modified carbon fiber;

[0045] 2) twisting a plurality of modified carbon fibers and glass fibers into a strand using a stranding machine, wherein the mass ratio of the modified carbon fibers to the glass fibers is 8:2, to obtain a mixed fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a mixed fiber mesh cloth having a mesh size of 0.5 mm;

[0046] 3) Alternately laying PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0047] Comparative Example 4

[0048] 1) Place the carbon fiber in a vacuum furnace and introduce dichloromethane gas at a flow rate of 1m 3 / s, heated to 1200 °C, kept warm for 4 h, and then naturally cooled to room temperature, washed with deionized water 3 times, and dried for 1 h to obtain purified carbon fibers;

[0049] 2) twisting a plurality of carbon fibers and glass fibers into a strand using a stranding machine, wherein the mass ratio of the carbon fibers to the glass fibers is 8:2, to obtain a mixed fiber roving having a linear density of 2500 tex; and then weaving the roving to obtain a mixed fiber mesh cloth having a mesh size of 0.5 mm;

[0050] 3) Alternately laying PA6 / PMMA / ABS composite masterbatch and fiber mesh cloth in the mold, wherein each layer of composite masterbatch is laid with a thickness of 1 mm, and a total of 5 layers of fiber mesh cloth and 6 layers of composite masterbatch are laid. The laid materials are hot pressed at a hot pressing temperature of 230° C., a pressure of 15 MPa, and a holding time of 100 min to obtain the sheet.

[0051] Experiments and data

[0052] Tensile performance test: Tested according to ISO527-2 standard, with a tensile speed of 5 mm / min.

[0053] Bending performance test: Tested according to ISO178 standard, bending speed is 2mm / min.

[0054] Impact resistance test: Tested according to ISO179 standard, bending speed is 2mm / min

[0055] Interlayer separation deformation index: Measure the angle between the extension lines of the two ends of the plate when the interlayer separates, and the bending speed is 2mm / min.

[0056] The test results are shown in Table 1 below:

[0057] Table 1

[0058]

[0059] As can be seen from Examples 1-3, the tensile strength continues to decrease with increasing glass fiber addition, but the flexural strength shows an upward inflection point, and the interlayer separation deformation index also shows an inflection point, demonstrating that glass fiber has an improving effect on the adhesion between the fiber web and the polymer. A comparison of the data from Comparative Examples 1-2 shows that the addition of PA6 to the composite masterbatch can improve the tensile and flexural strength of the material, but due to the layer separation factor, the impact strength decreases. The data from Comparative Example 3 shows that if PA6 is not added to the polymer, the addition of glass fiber will reduce the various properties of the composite board, demonstrating that the adhesion between the fiber web and the polymer is mainly improved by the bonding force between the glass fiber and PA6. The data from Comparative Example 4 shows that the modification of carbon fiber with boron nitride has a significant impact on the various properties of the composite board. In summary, this application improves the mechanical properties of the carbon fiber mesh and the polymer, as well as the adhesion between the two, by modifying the carbon fiber with boron nitride, mixing glass fiber, and adding PA6 to the polymer. The resulting composite panel has excellent strength, impact resistance, and seismic resistance, and can meet the impact and seismic resistance requirements of high-altitude airdrop boxes.

[0060] 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 seismic-resistant composite plate for airdrop, comprising a mixed fiber mesh cloth containing carbon fiber and glass fiber as a skeleton substrate, and a PA6 / PMMA / ABS material composited with the skeleton substrate, wherein the plate is prepared by the following method, characterized in that: The method specifically includes: 1) Modifying the carbon fiber to form boron nitride grains in situ on the surface of the carbon fiber; 2) twisting a plurality of modified carbon fibers obtained in step 1) with glass fibers into a strand using a stranding machine to obtain a mixed fiber roving; and then weaving the roving to obtain a mixed fiber mesh cloth; 3) Several layers of PA6 / PMMA / ABS composite masterbatch and modified mixed fiber mesh cloth are alternately laid in the mold, and the laid materials are hot pressed to obtain the seismic-resistant composite plate for airdrop, wherein the PA6 / PMMA / ABS composite masterbatch includes the following raw materials in parts by weight: 30-40 parts of PA6 resin, 30-40 parts of polymethyl methacrylate PMMA, 30-40 parts of ABS resin, 5-8 parts of MBS resin, 2.5-3 parts of silane coupling agent KH-792, 0.5-1 part of maleic anhydride grafted polystyrene, and 0.1-0.3 parts of oxidized polyethylene wax.

2. The plate according to claim 1, wherein The carbon fiber in step 1) is purified carbon fiber, and the purification process includes placing the carbon fiber in a vacuum furnace and introducing dichloromethane gas at a flow rate of 0.5-1m 3 / s, heated to 1100-1200°C, kept warm for 4-6 hours and then naturally cooled to room temperature, washed with deionized water and dried to obtain purified carbon fiber.

3. The plate material according to claim 2, wherein: Step 1) comprises: preparing a mixed solution containing boric acid and sodium azide; placing the purified carbon fiber in the mixed solution, and then sealing the reactor and subjecting it to a constant temperature hydrothermal reaction at 350-400°C for 5-10 hours to obtain carbon fiber with boron nitride grains on the surface, washing the obtained carbon fiber, and heating at 300-350°C for 4-6 hours to obtain modified carbon fiber.

4. The plate material according to claim 1, wherein In step 2), the mass ratio of the modified carbon fiber to the glass fiber is 7:3-9:1, and the linear density of the roving is 2000-3000tex.

5. The plate material according to claim 1, wherein: The PA6 / PMMA / ABS composite masterbatch is prepared by the following preparation method: (1) Add each component into a high-speed mixer according to the proportion and stir evenly in the high-speed mixer at room temperature; (2) The mixed materials are placed in a twin-screw extruder, melt-plasticized, extruded, cooled, and pelletized to obtain PA6 / PMMA / ABS composite masterbatch; the mixing melt temperature of the twin-screw extruder used is set to 220°C-230°C, and the head temperature is set to 240°C-250°C.

6. The plate material according to claim 1, wherein In step 3), 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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