Flame retardant thermal insulation material for aircraft

Abstract

The present invention relates to a flame-retardant thermal insulation material for aircraft, comprising a polyetheretherketone layer, a metal layer, a flame-retardant silicon aerogel layer and a phenolic foam fireproof and thermal insulation layer arranged in sequence from the outside to the inside; the flame-retardant silicon aerogel layer and the phenolic foam fireproof and thermal insulation layer both have a plate-like structure; the flame-retardant silicon aerogel layer comprises a first honeycomb material and a flame-retardant silicon aerogel filled in the honeycomb material, and the phenolic foam fireproof and thermal insulation layer comprises a second honeycomb material and a phenolic foam material filled in the honeycomb material; along the thickness direction of the flame-retardant thermal insulation material for aircraft, the first honeycomb material and the second honeycomb material both comprise a plurality of layers of sub-honeycomb structures, and the honeycomb density of the sub-honeycomb structures decreases or increases in sequence.

Description

Technical Field

[0001] The present invention relates to a flame retardant material, in particular to a flame retardant heat insulating material for aircraft. Background Art

[0002] Flame-retardant thermal insulation materials are used in aerospace aircraft. These materials are required to have low density and a smaller volume to achieve equivalent insulation performance to traditional insulation materials, a crucial advantage in aircraft thermal protection systems. However, the thermal conductivity difference between the inner and outer layers of current flame-retardant thermal insulation materials is minimal, which inevitably affects the material's flame retardancy in high-temperature environments. Therefore, the development of flame-retardant thermal insulation materials for aircraft with unidirectional thermal conductivity is essential. Summary of the Invention

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide a flame retardant and thermal insulating material for aircraft, which is light in weight, has good flame retardancy and thermal insulation properties, and has unidirectional thermal conductivity.

[0004] A flame-retardant thermal insulation material for aircraft according to the present invention comprises a polyetheretherketone layer, a metal layer, a flame-retardant silicon aerogel layer and a phenolic foam fireproof and thermal insulation layer arranged in sequence from the outside to the inside; the flame-retardant silicon aerogel layer and the phenolic foam fireproof and thermal insulation layer both have a plate-like structure; the flame-retardant silicon aerogel layer comprises a first honeycomb material and a flame-retardant silicon aerogel filled in the honeycomb material, and the phenolic foam fireproof and thermal insulation layer comprises a second honeycomb material and a phenolic foam material filled in the honeycomb material; along the thickness direction of the flame-retardant thermal insulation material for aircraft, the first honeycomb material and the second honeycomb material both comprise several layers of sub-honeycomb structures, and the honeycomb density of the sub-honeycomb structures decreases or increases in sequence.

[0005] Since the honeycomb density of the sub-honeycomb structure decreases or increases successively along the thickness direction of the flame-retardant thermal insulation material for aircraft, the unidirectional thermal conductivity of the flame-retardant silicon aerogel layer and the phenolic foam fireproof thermal insulation layer is improved.

[0006] Flame-retardant silica aerogel has excellent thermal stability, thermal shock resistance, and thermal insulation properties, and is lightweight and space-saving. Phenolic foam material, primarily composed of phenolic resin, flame retardants, smoke suppressants, curing agents, and foaming agents, is a closed-cell rigid foam plastic with fireproofing and thermal insulation properties.

[0007] Furthermore, an inert gas layer is connected to the side of the polyetheretherketone layer away from the metal layer. Within this layer are several sealed bags filled with inert gas. This inert gas layer not only improves the cushioning properties of the flame-retardant thermal insulation material for aircraft, but also allows the inert gas inside the bags to be released in the event of a fire, providing a degree of air insulation.

[0008] Furthermore, the bag body is made of polyvinyl chloride, which has good flame retardancy and processability.

[0009] Furthermore, the inert gas is nitrogen, which is highly safe and low in cost.

[0010] Furthermore, the bag body is coated with a polytetrafluoroethylene layer, which further improves the flame retardancy of the bag body.

[0011] Furthermore, along the thickness direction from closer to the PEEK layer, the cell density of the sub-honeycomb structure in the first honeycomb material decreases, and the cell density of the sub-honeycomb structure in the second honeycomb material decreases. Because one side of the PEEK layer is in contact with the outside air, the cell density of the sub-honeycomb structure near the PEEK layer is greater. Therefore, when the flame-retardant thermal insulation material is heated, the heat slowly enters the interior of the sub-honeycomb structure, thereby utilizing the thermal insulation properties of the flame-retardant silicone aerogel layer and the phenolic foam fireproof insulation layer. Preferably, the cell density of the sub-honeycomb structure in the first honeycomb material is greater than the cell density of the sub-honeycomb structure in the second honeycomb material.

[0012] Furthermore, the first honeycomb material and the second honeycomb material are both aluminum honeycomb materials.

[0013] Furthermore, the metal layer is aluminum or nickel.

[0014] Furthermore, a flame retardant fiber layer is provided between the metal layer and the flame retardant silicon aerogel layer.

[0015] Furthermore, the flame retardant fiber layer is ceramic fiber or polyamide fiber.

[0016] By means of the above solution, the present invention has at least the following advantages:

[0017] The flame-retardant thermal insulation material for aircraft of the present invention includes multiple functional layers with flame-retardant properties, and the flame-retardant effect is improved and the weight of the material is reduced by arranging a flame-retardant silicone aerogel layer and a phenolic foam fireproof and thermal insulation layer. In addition, since the first honeycomb material and the second honeycomb material both contain several layers of sub-honeycomb structures and the honeycomb density of the sub-honeycomb structures decreases or increases successively, the material is given unidirectional thermal conductivity.

[0018] The above description is only an overview of the technical solution of the present invention. In order to more clearly understand the technical means of the present invention and implement it according to the contents of the specification, the following is a description of the preferred embodiments of the present invention with detailed drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 1 is a schematic cross-sectional view of the flame-retardant thermal insulation material for aircraft in Example 1 of the present invention;

[0020] Figure 22. FIG. 1 is a schematic diagram of the top view structure of the flame retardant silicon aerogel layer;

[0021] Figure 3 1. It is a schematic diagram of the top view of the structure of the phenolic foam fireproof insulation layer;

[0022] Figure 4 This is a schematic cross-sectional view of the flame retardant insulation material for aircraft in Example 2 of the present invention.

[0023] Figure 5 This is a schematic cross-sectional view of the flame retardant insulation material for aircraft in Example 3 of the present invention.

[0024] Description of reference numerals:

[0025] 1-Polyetheretherketone layer; 2-Metal layer; 3-Flame-retardant silicon aerogel layer; 4-Phenolic foam fireproof and thermal insulation layer; 5-Inert gas layer; 6-Flame-retardant fiber layer; 10-Sub-honeycomb structure; 30-Flame-retardant silicon aerogel; 31-First honeycomb material; 40-Phenolic foam material; 41-Second honeycomb material. DETAILED DESCRIPTION

[0026] The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0027] Example 1

[0028] See also Figure 1 The flame-retardant thermal insulation material for aircraft of the present invention comprises, from the outside inward, a polyetheretherketone layer 1, a metal layer 2, a flame-retardant silicone aerogel layer 3, and a phenolic foam fireproof and thermal insulation layer 4. Both the flame-retardant silicone aerogel layer 3 and the phenolic foam fireproof and thermal insulation layer 4 are plate-shaped. The metal layer 2 is aluminum or nickel.

[0029] The flame retardant silicon aerogel layer 3 includes a first honeycomb material 31 and a flame retardant silicon aerogel 30 ( Figure 2 The phenolic foam fireproof insulation layer 4 includes a second honeycomb material 41 and a phenolic foam material 40 filled in the honeycomb material ( Figure 3 Both the first honeycomb material 31 and the second honeycomb material 41 are aluminum honeycomb materials. Along the thickness direction of the aircraft flame-retardant thermal insulation material, the first honeycomb material 31 and the second honeycomb material 41 each comprise multiple layers of sub-honeycomb structures 10. Along the thickness direction from approaching to away from the polyetheretherketone layer 1, the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 is greater than the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41.

[0030] Example 2

[0031] See also Figure 4 The flame-retardant thermal insulation material for aircraft of the present invention comprises, from the outside inward, a polyetheretherketone layer 1, a metal layer 2, a flame-retardant silicone aerogel layer 3, and a phenolic foam fireproof and thermal insulation layer 4. Both the flame-retardant silicone aerogel layer 3 and the phenolic foam fireproof and thermal insulation layer 4 are plate-shaped. The metal layer 2 is aluminum or nickel.

[0032] The flame retardant silicon aerogel layer 3 includes a first honeycomb material 31 and a flame retardant silicon aerogel 30 ( Figure 2 The phenolic foam fireproof insulation layer 4 includes a second honeycomb material 41 and a phenolic foam material 40 filled in the honeycomb material ( Figure 3 Both the first honeycomb material 31 and the second honeycomb material 41 are aluminum honeycomb materials. Along the thickness direction of the aircraft flame-retardant thermal insulation material, the first honeycomb material 31 and the second honeycomb material 41 each comprise multiple layers of sub-honeycomb structures 10. Along the thickness direction from approaching to away from the polyetheretherketone layer 1, the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 is greater than the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41.

[0033] The surface of the polyetheretherketone layer 1 facing away from the metal layer 2 is also connected to an inert gas layer 5. Several sealed bags filled with inert gas are placed in the inert gas layer 5. Preferably, the bags are made of polyvinyl chloride, coated with a polytetrafluoroethylene layer, and the inert gas is nitrogen.

[0034] Example 3

[0035] See also Figure 5 The flame-retardant thermal insulation material for aircraft of the present invention comprises, from the outside inward, a polyetheretherketone layer 1, a metal layer 2, a flame-retardant fiber layer 6, a flame-retardant silicone aerogel layer 3, and a phenolic foam fireproof and thermal insulation layer 4. The flame-retardant silicone aerogel layer 3 and the phenolic foam fireproof and thermal insulation layer 4 are both plate-shaped. The metal layer 2 is aluminum or nickel. The flame-retardant fiber layer 6 is ceramic fiber or polyamide fiber.

[0036] The flame retardant silicon aerogel layer 3 includes a first honeycomb material 31 and a flame retardant silicon aerogel 30 ( Figure 2 The phenolic foam fireproof insulation layer 4 includes a second honeycomb material 41 and a phenolic foam material 40 filled in the honeycomb material ( Figure 3Both the first honeycomb material 31 and the second honeycomb material 41 are aluminum honeycomb materials. Along the thickness direction of the aircraft flame-retardant thermal insulation material, the first honeycomb material 31 and the second honeycomb material 41 each comprise multiple layers of sub-honeycomb structures 10. Along the thickness direction from approaching to away from the polyetheretherketone layer 1, the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41 decreases, and the honeycomb density of the sub-honeycomb structures 10 in the first honeycomb material 31 is greater than the honeycomb density of the sub-honeycomb structures 10 in the second honeycomb material 41.

[0037] The surface of the polyetheretherketone layer 1 facing away from the metal layer 2 is also connected to an inert gas layer 5. Several sealed bags filled with inert gas are placed in the inert gas layer 5. Preferably, the bags are made of polyvinyl chloride, coated with a polytetrafluoroethylene layer, and the inert gas is nitrogen.

[0038] The above is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the technical principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A flame retardant thermal insulation material for aircraft, characterized by: The invention comprises a polyetheretherketone layer, a metal layer, a flame-retardant silicon aerogel layer, and a phenolic foam fireproof and thermal insulation layer, which are arranged in sequence from the outside to the inside; the flame-retardant silicon aerogel layer and the phenolic foam fireproof and thermal insulation layer are both plate-shaped structures; the flame-retardant silicon aerogel layer comprises a first honeycomb material and a flame-retardant silicon aerogel filled in the honeycomb material; the phenolic foam fireproof and thermal insulation layer comprises a second honeycomb material and a phenolic foam material filled in the honeycomb material; the first honeycomb material and the second honeycomb material both comprise a plurality of layers of sub-honeycomb structures; The side of the polyetheretherketone layer away from the metal layer is connected to an inert gas layer, and a plurality of sealed bags are placed in the inert gas layer, and the bags are filled with inert gas; Along the thickness direction from close to far away from the polyetheretherketone layer, the honeycomb density of the sub-honeycomb structure in the first honeycomb material decreases in sequence, and the honeycomb density of the sub-honeycomb structure in the second honeycomb material decreases in sequence; A flame retardant fiber layer is further provided between the metal layer and the flame retardant silicon aerogel layer.

2. The flame-retardant thermal insulation material for aircraft according to claim 1, characterized in that: The bag body is made of polyvinyl chloride.

3. The flame-retardant thermal insulation material for aircraft according to claim 1, characterized in that: The inert gas is nitrogen.

4. The flame retardant thermal insulation material for aircraft according to claim 1, characterized in that: The outside of the bag body is coated with a polytetrafluoroethylene layer.

5. The flame retardant thermal insulation material for aircraft according to claim 1, characterized in that: The first honeycomb material and the second honeycomb material are both aluminum honeycomb materials.

6. The flame retardant thermal insulation material for aircraft according to claim 1, characterized in that: The metal layer is aluminum or nickel.

7. The flame-retardant thermal insulation material for aircraft according to claim 1, characterized in that: The flame retardant fiber layer is ceramic fiber or polyamide fiber.

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