A drone composite material forming process

Abstract

The application relates to the technical field of unmanned planes, and discloses an unmanned plane composite material forming process, which comprises the following steps: S1, glue layer spraying: mixing epoxy ash primer, a diluent and a curing agent uniformly, and spraying the mixture on the surface of a mold to form a glue layer; S2, composite layer paste preparation: uniformly brushing a layer of adhesive glue on the surface of the glue layer, and sequentially performing layering according to the order of high-strength glass fiber cloth I, high-strength glass fiber cloth II, foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth to obtain a composite layer paste product; S3, curing forming: curing and forming the composite layer paste product; S4, mold closing: adding a partition frame and a pre-embedded part, extruding the adhesive glue, and warming and curing; and S5, mold opening: after the warming and curing are completed, cooling to normal temperature, opening the mold, and obtaining an unmanned plane composite material. Through the technical scheme, the problem of poor bearing capacity of the unmanned plane composite material in the prior art is solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of unmanned aerial vehicles, in particular to a composite material forming process for unmanned aerial vehicles. BACKGROUND

[0002] An unmanned aerial vehicle is a pilotless aircraft that is controlled by radio remote control equipment and self-provided program control device. At present, unmanned aerial vehicles mainly face the industries of electric power, oil, agriculture and forestry, maritime affairs, public security and fire fighting, and play a great role in the fields of regional monitoring, pipeline patrol, aerial photography, rescue and disaster relief, and emergency command.

[0003] The unmanned aerial vehicle has low speed, and the fuselage and wings bear low load, so the selection of materials emphasizes "light weight" more. Since the composite material has the advantages of light weight, high specific strength, high specific modulus, strong fatigue resistance and strong shock resistance, the amount of composite material used in large unmanned aerial vehicles is increasing, and it gradually replaces aluminum alloy. The performance of the composite material mainly depends on the reinforcing material (carbon fiber, glass fiber, etc.) and the adhesive glue. The existing unmanned aerial vehicle composite material is mostly brittle material, which can only bear small load and cannot meet the use requirements in harsh working conditions. Therefore, it is urgent to explore a new unmanned aerial vehicle composite material forming process to meet the use requirements of unmanned aerial vehicles in various working conditions. SUMMARY

[0004] The present application provides a composite material forming process for unmanned aerial vehicles, which solves the problem of poor bearing capacity of the unmanned aerial vehicle composite material in the related art.

[0005] The technical scheme of the present application is as follows:

[0006] The present application provides a composite material forming process for unmanned aerial vehicles, which includes the following steps:

[0007] S1, glue layer spraying: mixing epoxy gray primer, diluent and curing agent uniformly, spraying on the surface of the mold to form a glue layer, the mass ratio of the epoxy gray primer, the diluent and the curing agent is 4:2:1;

[0008] S2, composite layer paste preparation: uniformly brushing a layer of adhesive glue on the surface of the glue layer, and sequentially performing layering according to the order of high-strength glass fiber cloth I, high-strength glass fiber cloth II, foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth to obtain a composite layer paste product;

[0009] The adhesive glue includes the following components: glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, methyl phenyl silicone resin, kaolin powder and accelerator;

[0010] S3, curing forming: curing and forming the composite layer paste product;

[0011] S4, clamping: add the partition frame and the embedded part, extrude the adhesive glue, and warm and cure;

[0012] S5, demolding: after the warm and curing is completed, cooling to normal temperature, demolding, and obtaining the unmanned aerial vehicle composite material.

[0013] As a further technical solution, in step S1, the thickness of the gel coat layer is 0.3-0.5mm.

[0014] As a further technical solution, in step S2, the thickness of the high-strength glass fiber cloth I is 0.06mm; the thickness of the high-strength glass fiber cloth II is 0.08mm; and the thickness of the foam is 3mm.

[0015] As a further technical solution, in step S2, the adhesive glue comprises the following components by weight: 30-70 parts of glycidyl ester type epoxy resin, 20-30 parts of glycidyl amine type epoxy resin, 20-30 parts of methyl phenyl silicone resin, 6-8 parts of kaolin powder, and 4-6 parts of accelerator.

[0016] As a further technical solution, the mass ratio of the glycidyl ester type epoxy resin, the glycidyl amine type epoxy resin and the methyl phenyl silicone resin is 2:1:1.

[0017] As a further technical solution, the accelerator is dibutyl tin dilaurate or dibutyl tin diacetate.

[0018] As a further technical solution, the preparation of the adhesive glue comprises the following steps:

[0019] A1, stirring the glycidyl ester type epoxy resin and the kaolin powder uniformly at 40-50 DEG C to obtain a homogeneous solution;

[0020] A2, after stirring the homogeneous solution, the glycidyl amine type epoxy resin and the methyl phenyl silicone resin uniformly, adding the accelerator and stirring and dispersing to obtain the adhesive glue.

[0021] As a further technical solution, in step S3, the curing forming adopts a negative pressure forming process.

[0022] As a further technical solution, in the negative pressure forming, the pressure is -0.06MPa to -0.08MPa; the curing temperature is 75-85 DEG C; and the curing time is 50-70min.

[0023] As a further technical solution, in step S4, the curing temperature during the warm and curing is 75-85 DEG C; and the curing time is 50-70min.

[0024] The working principle and beneficial effects of the present application are:

[0025] 1. In this invention, by using highly reactive methylphenyl silicone resin to undergo a cross-linking and curing reaction with glycidyl ester type epoxy resin and glycidyl amine type epoxy resin, and combining it with kaolin, the mechanical properties of the composite layer after bonding and curing are improved, thereby enhancing the load-bearing capacity of the UAV composite material. This reduces the maximum residual deformation of the obtained UAV composite material to below 0.7 cm during static testing, and there is no localized damage.

[0026] 2. In this invention, the load-bearing capacity of the UAV composite material can be further improved when the mass ratio of glycidyl ester type epoxy resin, glycidyl amine type epoxy resin, and methylphenyl organosilicon resin is 2:1:1.

[0027] 3. In this invention, kaolin powder is first mixed and stirred with low-viscosity glycidyl ester type epoxy resin to obtain a homogeneous solution, and then the homogeneous solution is mixed with other components to obtain an adhesive. This is beneficial for the uniform dispersion of kaolin powder in the adhesive, thereby further enhancing the load-bearing capacity of the UAV composite material. Detailed Implementation

[0028] The technical solutions of the present invention will be clearly and completely described below with reference to the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0029] In the following examples and comparative examples, the epoxy primer is model YTS04, the thinner is model AK321, the curing agent is model T31, the glycidyl ester epoxy resin is model TDE85, the glycidyl amine epoxy resin is model AG80, the methyl phenyl silicone resin is model GMV3042, the kaolin powder has a mesh size of 1500, and the mass fraction of silica in the kaolin powder is 45%.

[0030] In the following examples and comparative examples, before spraying the gel coat layer, it is necessary to check whether the mold is damaged or scratched. If there is no damage or scratch, apply the mold release agent 7-8 times. If there is damage or scratch, it should be repaired first, and the repaired area should be applied with the mold release agent 10 times before applying the mold release agent 1-2 times to the whole mold. When demolding, the mold needs to be cooled to room temperature (25°C).

[0031] Example 1

[0032] A composite material molding process for drones includes the following steps:

[0033] S1, glue layer spraying: mixing epoxy primer, diluent and curing agent uniformly, spraying on the surface of the mold to form a glue layer, the mass ratio of epoxy primer, diluent and curing agent is 4:2:1;

[0034] S2, composite layer paste: evenly brushing a layer of adhesive on the surface of the glue layer, according to the order of 0.06mm thick high-strength glass fiber cloth, 0.08mm thick high-strength glass fiber cloth, 3mm thick foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth, laminating, brushing, pressing and removing bubbles to obtain a composite layer paste product;

[0035] The preparation of the adhesive includes the following steps:

[0036] A1, stirring 40 parts of glycidyl ester type epoxy resin and 6 parts of kaolin powder uniformly at 40℃ to obtain a homogeneous solution;

[0037] A2, stirring the homogeneous solution with 20 parts of glycidyl amine type epoxy resin and 20 parts of methyl phenyl silicone resin, then adding 4 parts of accelerator and stirring to disperse to obtain the adhesive.

[0038] S3, curing forming: curing and forming the composite layer paste product by using negative pressure forming process, the pressure is-0.06MPa during negative pressure forming, the curing temperature is 75℃, and the curing time is 70min;

[0039] S4, mold closing: adding spacer and embedded part, extruding 300g adhesive, heating and curing, the temperature is 75℃, and the curing time is 70min;

[0040] S5, demolding: after heating and curing, cooling to room temperature 25℃, demolding, inspecting and finishing to obtain the unmanned aerial vehicle composite material.

[0041] Example 2

[0042] A process for forming an unmanned aerial vehicle composite material, comprising the following steps:

[0043] S1, glue layer spraying: mixing epoxy primer, diluent and curing agent uniformly, spraying on the surface of the mold to form a glue layer, the mass ratio of epoxy primer, diluent and curing agent is 4:2:1;

[0044] S2, composite layer paste: evenly brushing a layer of adhesive on the surface of the glue layer, according to the order of 0.06mm thick high-strength glass fiber cloth, 0.08mm thick high-strength glass fiber cloth, 3mm thick foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth, laminating, brushing, pressing and removing bubbles to obtain a composite layer paste product;

[0045] The preparation of the adhesive includes the following steps:

[0046] A1, 50 parts of glycidyl ester type epoxy resin and 7 parts of kaolin powder are stirred uniformly at 45°C to obtain a homogeneous solution;

[0047] A2, the homogeneous solution is stirred uniformly with 25 parts of glycidyl amine type epoxy resin, 25 parts of methylphenyl silicone resin, then 5 parts of accelerator is added and stirred to disperse, to obtain adhesive glue.

[0048] S3, curing molding: the composite layer paste product is cured and molded by adopting negative pressure molding process, the pressure is-0.07MPa during negative pressure molding, the curing temperature is 80°C, and the curing time is 60min;

[0049] S4, mold closing: add spacer and embedded part, extrude 300g adhesive glue, heat curing, temperature is 80°C, and curing time is 60min;

[0050] S5, demolding: after heat curing is completed, cooling to normal temperature 25°C, demolding, inspection and finishing, to obtain unmanned aerial vehicle composite material.

[0051] Example 3

[0052] An unmanned aerial vehicle composite material forming process, comprising the following steps:

[0053] S1, glue layer spraying: mixing epoxy primer, diluent and curing agent uniformly, spraying on the surface of the mold to form a glue layer, the mass ratio of epoxy primer, diluent and curing agent is 4:2:1;

[0054] S2, composite layer paste: evenly brushing a layer of adhesive glue on the surface of the glue layer, according to the order of 0.06mm thick high-strength glass fiber cloth, 0.08mm thick high-strength glass fiber cloth, 3mm thick foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth, laminating in turn, brushing, pressing and exhausting bubbles to obtain composite layer paste product;

[0055] The preparation of the adhesive glue comprises the following steps:

[0056] A1, 60 parts of glycidyl ester type epoxy resin and 8 parts of kaolin powder are stirred uniformly at 50°C to obtain a homogeneous solution;

[0057] A2, the homogeneous solution is stirred uniformly with 30 parts of glycidyl amine type epoxy resin, 30 parts of methylphenyl silicone resin, then 6 parts of accelerator is added and stirred to disperse, to obtain adhesive glue.

[0058] S3, curing molding: the composite layer paste product is cured and molded by adopting negative pressure molding process, the pressure is-0.08MPa during negative pressure molding, the curing temperature is 85°C, and the curing time is 50min;

[0059] S4, clamping: add partition frame and embedded parts, extrude 300g adhesive, warm curing, temperature is 85℃, curing time is 50min;

[0060] S5, demolding: after warm curing, cool to room temperature 25℃, demolding, test and trim, get unmanned aerial vehicle composite material.

[0061] Example 4

[0062] The difference between this example and example 2 is only that the preparation of adhesive in step S2 is different, the preparation of adhesive in this example includes the following steps:

[0063] A1, 30 parts of glycidyl ester type epoxy resin and 7 parts of kaolin powder are stirred uniformly at 45℃ to obtain a homogeneous solution;

[0064] A2, after the homogeneous solution is stirred uniformly with 25 parts of glycidyl amine type epoxy resin and 25 parts of methyl phenyl silicone resin, 5 parts of accelerator is added and stirred to disperse, to obtain adhesive.

[0065] Example 5

[0066] The difference between this example and example 2 is only that the preparation of adhesive in step S2 is different, the preparation of adhesive in this example includes the following steps:

[0067] A1, 70 parts of glycidyl ester type epoxy resin and 7 parts of kaolin powder are stirred uniformly at 45℃ to obtain a homogeneous solution;

[0068] A2, after the homogeneous solution is stirred uniformly with 25 parts of glycidyl amine type epoxy resin and 25 parts of methyl phenyl silicone resin, 5 parts of accelerator is added and stirred to disperse, to obtain adhesive.

[0069] Example 6

[0070] The difference between this example and example 2 is only that the preparation of adhesive in step S2 is different, the preparation of adhesive in this example includes the following steps: 50 parts of glycidyl ester type epoxy resin, 25 parts of glycidyl amine type epoxy resin, 25 parts of methyl phenyl silicone resin and 7 parts of kaolin powder are stirred uniformly, then 5 parts of accelerator is added and stirred to disperse, to obtain adhesive.

[0071] Comparative example 1

[0072] The difference between this example and example 2 is only that the preparation of adhesive in step S2 is different, the preparation of adhesive in this example includes the following steps:

[0073] Comparative example 2

[0074] The difference between the present comparative example and example 2 is only that the preparation of the adhesive glue in step S2 is different, and no kaolin powder is added in the present comparative example, and the preparation step is as follows: 50 parts of glycidyl ester type epoxy resin, 25 parts of glycidyl amine type epoxy resin and 25 parts of methyl phenyl silicone resin are stirred uniformly, then 5 parts of accelerator is added and stirred to disperse, to obtain the adhesive glue.

[0075] The unmanned aerial vehicle composite obtained from examples 1-6 and comparative examples 1-2 is subjected to static test experiment. The steps of the static test experiment are as follows:

[0076] ①The unmanned aerial vehicle composite is evenly divided into 5 regions, and 30 kg of sandbags are loaded in each region, and the maximum deformation of the unmanned aerial vehicle composite is measured by using a micrometer, and after keeping for 3S, whether the unmanned aerial vehicle composite appears local damage is observed;

[0077] ②The sandbags in each region are unloaded, and the maximum residual deformation of the unmanned aerial vehicle composite is measured by using a micrometer.

[0078] The test results are shown in Table 1 below.

[0079] Table 1: Static test experiment results of unmanned aerial vehicle composite

[0080]

[0081] It can be known from the results of examples 1-6 that the unmanned aerial vehicle composite prepared by the present application has high bearing capacity. The comparison between example 2 and examples 4 and 5 shows that when the mass ratio of glycidyl ester type epoxy resin, glycidyl amine type epoxy resin and methyl phenyl silicone resin in the adhesive glue is 2:1:1, the unmanned aerial vehicle composite has the best bearing capacity. The comparison between example 2 and example 6 shows that mixing and stirring the kaolin powder and the glycidyl ester type epoxy resin with low viscosity to obtain a homogeneous solution, and then mixing the homogeneous solution with other components to obtain the adhesive glue, is helpful for the uniform dispersion of the kaolin powder in the adhesive glue, and is beneficial to improve the bearing capacity of the unmanned aerial vehicle composite.

[0082] In addition, both comparative examples 1 and 2 appear local damage, and the maximum deformation and the maximum residual deformation are both significantly greater than that of example 2, which shows that adding methyl phenyl silicone resin and kaolin powder in the adhesive glue can enhance the bearing capacity of the unmanned aerial vehicle composite.

[0083] The above is only a preferred embodiment of the present application, and is not used to limit the present application, and any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A drone composite molding process, characterized by, The method comprises the following steps: S1, spraying the glue layer: mixing epoxy primer, diluent and curing agent uniformly, and spraying on the surface of the mold to form a glue layer, wherein the mass ratio of the epoxy primer, the diluent and the curing agent is 4:2:1; S2, composite layer paste preparation: uniformly brushing a layer of adhesive on the surface of the glue layer, and sequentially laying high-strength glass fiber cloth I, high-strength glass fiber cloth II, foam, carbon fiber glass fiber mixed cloth and 3K carbon fiber cloth to obtain a composite layer paste product; The adhesive comprises the following components by weight: 30-70 parts of glycidyl ester type epoxy resin, 20-30 parts of glycidyl amine type epoxy resin, 20-30 parts of methyl phenyl silicone resin, 6-8 parts of kaolin powder and 4-6 parts of accelerator; S3, curing forming: curing and forming the composite layer paste product; S4, mold closing: adding a spacer and a pre-embedded part, extruding the adhesive, and curing by heating; S5, demolding: after the heating and curing are completed, cooling to room temperature, demolding, and obtaining a UAV composite material; The mass ratio of the glycidyl ester type epoxy resin, the glycidyl amine type epoxy resin and the methyl phenyl silicone resin is 2:1:

1.

2. The unmanned aerial vehicle composite material molding process of claim 1, wherein, In step S1, the thickness of the glue layer is 0.3-0.5 mm.

3. The unmanned aerial vehicle composite material molding process of claim 1, wherein, In step S2, the thickness of the high-strength glass fiber cloth I is 0.06 mm; the thickness of the high-strength glass fiber cloth II is 0.08 mm; and the thickness of the foam is 3 mm.

4. The unmanned aerial vehicle composite material molding process of claim 1, wherein, The accelerator is dibutyltin dilaurate or dibutyltin diacetate.

5. The unmanned aerial vehicle composite material molding process of claim 1, wherein, The preparation of the adhesive comprises the following steps: A1, stirring the glycidyl ester type epoxy resin and the kaolin powder uniformly at 40-50°C to obtain a homogeneous solution; A2, stirring the homogeneous solution with the glycidyl amine type epoxy resin and the methyl phenyl silicone resin uniformly, then adding the accelerator and stirring and dispersing to obtain the adhesive.

6. The unmanned aerial vehicle composite material molding process of claim 1, wherein, In step S3, the curing forming adopts a negative pressure forming process.

7. The unmanned aerial vehicle composite material molding process of claim 6, wherein, When the negative pressure forming is performed, the pressure is-0.06 MPa to-0.08 MPa, the curing temperature is 75-85°C, and the curing time is 50-70 min.

8. The unmanned aerial vehicle composite material molding process of claim 1, wherein, In step S4, the curing temperature during the heating and curing is 75-85°C, and the curing time is 50-70 min.

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