High-strength arc-shaped composite material plate and forming process thereof

Abstract

The invention is applicable to the technical field of special-shaped composite materials, and provides a high-strength arc-shaped composite material plate which comprises a glass fiber layer and a resin layer, wherein the glass fiber layer is formed by sequentially laying three kinds of glass fiber cloth with different specifications; the resin layer is prepared from the following raw materials in parts by weight: 100 parts of resin, 81.95 to 82.05 parts of a curing agent and 0.245 to 0.0.25 part of an accelerant. The invention further provides a forming process of the high-strength arc-shaped composite material plate. According to the invention, a vacuum resin pouring molding process is adopted, and the resin infiltrates the glass fabric in a vacuum state, so that the contents of air and other volatile matters are greatly reduced, and the composite material plate has excellent performance; the mold adopts the female mold, so that the problem of wrinkles after vacuumizing of the glass fabric is greatly reduced, shrinkage and deformation of a formed product are fully considered, during specific implementation, the reversible deformation size is calculated according to actual conditions, the mold is designed according to the size, the processing amount is reduced, and the mechanical strength of the composite material plate is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of special-shaped composite materials, and in particular relates to a high-strength arc-shaped composite material plate and a forming process thereof. Background Art

[0002] The conductor performance research platform is one of the important components of the superconducting magnet system of the comprehensive research facility of the key system of the fusion reactor host. Its scientific goal is to master the electromagnetic behavior characteristics of the superconducting conductor composite structure under the action of multiple fields under the operation conditions of the fusion reactor; to evaluate the engineering reliability and operation process safety of the superconducting conductor. The back field magnet is a key component of the platform. The magnet operates at liquid helium temperature, is under pressure during operation, and generates a large electromagnetic force.

[0003] Taking into account the actual assembly and operation requirements, a 120° arc-shaped composite material plate consistent with the coil radius needs to be installed on the upper end of the magnet to participate in the entire operation process of the magnet. Therefore, higher mechanical performance requirements are placed on the composite material plate. Summary of the invention

[0004] The purpose of the embodiments of the present invention is to provide a high-strength curved composite material plate, aiming to solve the problems raised in the above background technology.

[0005] The embodiment of the present invention is implemented as follows: a high-strength curved composite material plate, the composite material plate comprising a glass fiber layer and a resin layer;

[0006] Wherein, the glass fiber layer is glass fiber cloth of three different specifications laid in sequence;

[0007] The resin layer comprises the following raw materials in parts by weight: 100 parts of resin, 81.95-82.05 parts of curing agent, and 0.245-0.255 parts of accelerator.

[0008] Preferably, the glass fiber cloth is a cloth woven from high-strength No. 2 glass fiber, model SWR400-80, with a glass fiber content of 50-60%.

[0009] Preferably, the resin is GY282 epoxy resin.

[0010] Another object of the embodiment of the present invention is to provide a forming process of a high-strength curved composite material plate, comprising the following steps:

[0011] (1) Mold preparation: clean the mold with mold cleaning water, apply multiple layers of sealing agent in a spiral, and then apply multiple layers of release agent in a spiral;

[0012] (2) Preparation of fiberglass cloth: prepare several pieces of SWR400-80 fiberglass cloth of three different specifications;

[0013] (3) Laying of fiberglass cloth: Mark the laying area on the mold, lay the fiberglass cloth in the laying area in order from large to small, and use a flat plate to smooth it out one by one to meet the requirement of laying without wrinkles, and obtain the fiberglass layer:

[0014] (4) Auxiliary material laying: Lay the release cloth on the upper surface of the glass fiber layer, then place the guide net, glue injection port, one-way breathable film and exhaust port, and cover with two layers of vacuum film;

[0015] (5) Resin preparation: preheat the resin and curing agent, then mix the resin, curing agent and accelerator in a ratio of 100:82±0.05:0.25±0.005, degas the prepared raw materials, and then keep them warm;

[0016] (6) Glue injection: Open the vacuum port to extract the air in the tube, and then start injecting glue through the glue injection port. When the one-way breathable membrane is filled with resin, close the glue injection port to end the injection.

[0017] (7) Curing: Set the heating rate to 5℃ / 1h, heat to 90±5℃ in 8 hours, heat at this temperature for 10 hours, then set the heating rate to 5℃ / 1h, heat to 130±5℃ in 8 hours, heat at this temperature for 15 hours, and finally cool down with the furnace. It can be opened only when the temperature drops below 40℃ to form a resin layer;

[0018] (8) Demolding: Remove the auxiliary materials, separate the composite material board from the mold, and hoist it upright on the ground:

[0019] (9) Post-processing: Processing and trimming of composite materials.

[0020] Preferably, in step (1), three layers of sealing agent are spirally coated, each time with an interval of 10-15 minutes, and then five layers of release agent are spirally coated, each time with an interval of 10-15 minutes.

[0021] Preferably, in step (4), the guide net is located at the center of the release cloth, the glue injection port is located at the center of the guide net, the one-way breathable membrane is located at the four corners of the release cloth, and the air extraction port is located at the edge of the one-way breathable membrane.

[0022] Preferably, in step (5), the preheating temperature is 50°C, the preheating time is 2h, and the insulation temperature is 50±5°C.

[0023] The embodiment of the present invention provides a high-strength curved composite material plate, which adopts a vacuum resin pouring molding process. The resin impregnates the glass fiber cloth under a vacuum state, greatly reducing the content of air and other volatiles, and the composite material plate has excellent performance;

[0024] The mold adopts a negative mold, which greatly reduces the wrinkle problem of the glass fiber cloth after vacuuming, and fully considers the shrinkage and deformation of the product after molding. In the specific implementation, the anti-deformation size is calculated according to the actual situation, and the mold is designed according to this size, which reduces the processing amount and improves the mechanical strength of the composite material board. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A block diagram of a forming process of a high-strength curved composite material plate provided by an embodiment of the present invention;

[0026] Figure 2 A schematic diagram of a mold provided by an embodiment of the present invention;

[0027] Figure 3 A flow path diagram made of auxiliary materials provided in an embodiment of the present invention;

[0028] Figure 4 A schematic diagram after glue injection provided by an embodiment of the present invention;

[0029] Figure 5 This is a dimensional diagram of a high-strength curved composite material plate provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical solution and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0031] The specific implementation of the present invention is described in detail below in conjunction with specific embodiments.

[0032] Example 1: A high-strength curved composite material plate, the forming process of which is as follows: Figure 1 As shown, the specific steps include:

[0033] (1) Mold preparation: Use mold cleaning water to clean the mold (such as Figure 2 Clean it up, apply the sealing agent 3 times in a spiral manner, with an interval of 10-15 minutes between each application, and then apply the release agent 5 times in a spiral manner, with an interval of 10-15 minutes between each application;

[0034] (2) Preparation of fiberglass cloth: According to the actual situation, prepare 60 pieces of SWR400-80 fiberglass cloth with a size of 1.500m*0.32m, 60 pieces of SWR400-80 fiberglass cloth with a size of 1.470m*0.32m, and 55 pieces of SWR400-80 fiberglass cloth with a size of 1.440m*0.32m;

[0035] (3) Fiberglass cloth laying: mark the laying area on the mold, lay the cut fiber cloth in the laying area, use a flat plate to level it out, press every 60 layers of bags once to ensure that there are no wrinkles when laying. The laying order is: 60 layers of 1.500m*0.32m, 60 layers of 1.470m*0.32m, and 55 layers of 1.440m*0.32m.

[0036] (3) Laying of auxiliary materials: Lay the demoulding cloth on the upper surface of the fiberglass cloth, and place the breathable mold, guide net, injection seat, spiral tube, injection tube, etc. according to the flow channel diagram (such as Figure 3 As shown), covered with two layers of vacuum film;

[0037] (4) Resin preparation:

[0038] a. Preheat the resin and curing agent at 50℃ for 2h;

[0039] b. Prepare the resin according to the ratio of resin: curing agent: accelerator = 100: 82 ± 0.05: 0.25 ± 0.005, move the prepared raw materials to the degassing tank for degassing for 10 minutes, and set the heating belt to 50 ± 5 ° C to keep the resin warm after degassing;

[0040] (5) Glue injection:

[0041] a. Place the injection tube below the resin liquid level (make sure the inlet of the tube is below the resin liquid level during the injection process to avoid drawing in gas) and slowly open the air extraction port to draw out the air in the tube;

[0042] b. After exhausting, start injecting glue through the injection port. When the one-way breathable membrane is filled with resin, close the injection port and end the injection. During the injection process, there should be no leakage in the pipes and joints. Figure 4 As shown;

[0043] (6) Curing:

[0044] a. Set the heating rate to 5℃ / 1h, heat to 90±5℃ in 8 hours, and heat at this temperature for 10 hours;

[0045] b. Set the heating rate to 5℃ / 1h, heat to 130±5℃ in 8 hours, and heat at this temperature for 15h;

[0046] c. Cool down with the furnace, and open it only when the temperature drops below 40℃;

[0047] (7) Demolding: Tear off the surface auxiliary materials, use wedges to remove the composite material board from the mold, and hoist it upright on the ground;

[0048] (8) Post-processing: According to the actual situation and the requirements of the drawings (such as Figure 5 The shape of the processed composite material plate (as shown)

[0049] Mechanical test: Take the axial compression sample of the composite material plate prepared in Example 1 to test its axial compression strength. The test results are shown in Table 1 below:

[0050] Table 1

[0051]

[0052] It can be seen from the data in Table 1 that the arc-shaped composite material plate prepared in Example 1 has a relatively high compressive strength and meets the use requirements.

[0053] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A high-strength curved composite material plate, characterized in that: The composite material plate comprises a glass fiber layer and a resin layer; Wherein, the glass fiber layer is glass fiber cloth of three different specifications laid in sequence; The resin layer comprises the following raw materials in parts by weight: 100 parts of resin, 81.95-82.05 parts of curing agent, and 0.245-0.255 parts of accelerator.

2. The high-strength curved composite material plate according to claim 1, characterized in that: The glass fiber cloth is a cloth woven from high-strength No. 2 glass fiber, model SWR400-80, with a glass fiber content of 50-60%.

3. The high-strength curved composite material plate according to claim 1, characterized in that: The resin is GY282 epoxy resin.

4. A forming process for a high-strength curved composite material plate as claimed in any one of claims 1 to 3, characterized in that: The following steps are involved: (1) Mold preparation: clean the mold with mold cleaning water, apply multiple layers of sealing agent in a spiral, and then apply multiple layers of release agent in a spiral; (2) Preparation of fiberglass cloth: prepare several pieces of SWR400-80 fiberglass cloth of three different specifications; (3) Laying of fiberglass cloth: Mark the laying area on the mold, lay the fiberglass cloth in the laying area in order from large to small, and use a flat plate to smooth it out one by one to meet the requirement of laying without wrinkles, and obtain the fiberglass layer: (4) Auxiliary material laying: Lay the release cloth on the upper surface of the glass fiber layer, then place the guide net, glue injection port, one-way breathable film and exhaust port, and cover with two layers of vacuum film; (5) Resin preparation: preheat the resin and curing agent, then mix the resin, curing agent and accelerator in a ratio of 100:82±0.05:0.25±0.005, degas the prepared raw materials, and then keep them warm. The resin adopts GY282 epoxy resin system; (6) Glue injection: Open the vacuum port to extract the air in the tube, and then start injecting glue through the glue injection port. When the one-way breathable membrane is filled with resin, close the glue injection port to end the injection. (7) Curing: Set the heating rate to 5℃ / 1h, heat to 90±5℃ in 8 hours, heat at this temperature for 10 hours, then set the heating rate to 5℃ / 1h, heat to 130±5℃ in 8 hours, heat at this temperature for 15 hours, and finally cool down with the furnace. It can be opened only when the temperature drops below 40℃ to form a resin layer; (8) Demolding: Remove the auxiliary materials, separate the composite material board from the mold, and hoist it upright on the ground: (9) Post-processing: Processing and trimming of composite materials.

5. The forming process of the high-strength curved composite material plate according to claim 4, characterized in that: In step (1), three layers of sealing agent are applied in a spiral manner, each time interval is 10-15 minutes, and then five layers of release agent are applied in a spiral manner, each time interval is 10-15 minutes.

6. The forming process of the high-strength curved composite material plate according to claim 4, characterized in that: In step (4), the guide net is located at the center of the release cloth, the glue injection port is located at the center of the guide net, the one-way breathable membrane is located at the four corners of the release cloth, and the air extraction port is located at the edge of the one-way breathable membrane.

7. The forming process of the high-strength curved composite material plate according to claim 4, characterized in that: In step (5), the preheating temperature is 50°C, the preheating is for 2 hours, and the insulation temperature is 50±5°C.

Images