A kind of extrusion-molded hollow heat-proof sleeve

Abstract

The present invention provides an extruded hollow heat-proof sleeve, which has a five-layer structure from the inside to the outside, which is: the first layer is a hollow tube extruded by flame-retardant internally kneaded silicone rubber, the second layer is a three-proof paint layer, the third layer is an aluminum-plated film, the fourth layer is a polyester fiber sleeve, and the fifth layer is a polyimide film with aluminum film on both sides, which is wound on the outer surface of the sleeve by 1 / 2 overlap; the three-proof paint layer is an organic silicon paint film; the polyester fiber sleeve is a sleeve formed by coating aerogel on the surface of polyester fiber yarn, plying it into 6 yarns and then weaving it, and the aerogel is a high-temperature resistant modified ZrO2-SiO2 composite aerogel obtained by adding an organic silane modifier. The extruded hollow heat-proof sleeve made by the present invention not only has the advantages of flexibility, lightness and aging resistance on the basis of meeting the heat-proof performance, but also can be used at 40kW / m 2 or 54kW / m 2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the casing is maintained at no more than 180°C within 800 seconds.

Description

Technical Field

[0001] The invention relates to a heat-proof and insulating material, in particular to an extruded hollow heat-proof sleeve for protecting cables and core wires on an aircraft. Background Art

[0002] According to the requirements of a certain aircraft model, it is necessary to develop a heat-resistant sleeve for protecting cables. The sleeve is required to be 40kW / m 2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the tube is kept below 180°C within 800 seconds, or at 54kW / m 2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the tube is kept below 180°C within 800 seconds. Summary of the invention

[0003] The technical problem to be solved by the present invention is to provide an extruded hollow heat-proof sleeve which is heat-proof and flexible, lightweight and aging-resistant.

[0004] To achieve the above-mentioned purpose, the present invention provides the following technical scheme: an extruded hollow heat-proof sleeve, which has a five-layer structure from the inside to the outside, which are: the first layer is a hollow tube extruded by flame-retardant internally kneaded silicone rubber, the second layer is a three-proof paint layer, the third layer is an aluminum-plated film, the fourth layer is a polyester fiber sleeve, and the fifth layer is a polyimide film with aluminum film on both sides, which is wound on the outer surface of the sleeve with 1 / 2 overlap; the three-proof paint layer is an organic silicon paint film; the polyester fiber sleeve is a sleeve formed by coating aerogel on the surface of polyester fiber yarn, twisting it into 6 strands of yarn and then weaving it, and the aerogel is a high-temperature resistant modified ZrO2-SiO2 composite aerogel obtained by adding an organic silane modifier.

[0005] Preferably, the thermal conductivity of the hollow tube is 0.013% and the thickness is 1.3-1.5 mm.

[0006] Preferably, the thickness of the conformal coating layer is 0.03-0.06 mm.

[0007] Preferably, the aluminum film is made of 99.5% vacuum aluminum plated aluminum ring, at 6.0×E -3 Pa, and the thickness is 0.01~0.05mm.

[0008] Preferably, the polyester fiber sleeve is a 400D polyester fiber yarn coated with a certain aerogel impregnation liquid on its surface, which is then plied into 6 strands of yarn and woven into a sleeve with a thickness of 1.8-3.5 mm. The aerogel is prepared by adding an organic silane modifier to prepare a modified ZrO2-SiO2 precursor sol, and then aging and drying to obtain a high temperature resistant modified ZrO2-SiO2 composite aerogel with a thermal conductivity of 0.018%.

[0009] Preferably, the thickness of the polyimide film is 0.05-0.06 mm; the polyimide film is made of 99.5% vacuum-plated aluminum material aluminum ring, at 6.0×E -3 The film is aluminum-plated under a vacuum degree of Pa. The cut film is wrapped around the outer surface of the sleeve at a 1 / 2 overlap, with a thickness of 0.07~0.15mm.

[0010] The preparation method of the present invention comprises the following process steps: ① preparing a mold; ② refining a flame-retardant internally mixed silicone rubber on a rubber mixer, and extruding and molding the hollow tube on an extruder; ③ impregnating and curing the three-proof paint layer on the surface of the hollow tube; ④ starting vacuum evaporation coating, and coating the surface of the three-proof paint layer with an aluminum film; ⑤ weaving a polyester fiber sleeve on the surface of the aluminum film; ⑥ selecting a polyimide film with a double-sided aluminum film and winding it on the outer surface of the sleeve with a 1 / 2 overlap.

[0011] In step ⑤, the polyester fiber sleeve is made by selecting 400D polyester fiber yarn, coating a certain amount of aerogel impregnation liquid on its surface and baking it on a vertical gluing machine at a baking temperature of 100-120°C for 15-30 minutes to completely cure it. After curing, it is plied into 6 strands of yarn and woven into a sleeve.

[0012] The extruded hollow heat-resistant sleeve produced by the manufacturing method of the present invention has the advantages of flexibility, lightness and aging resistance on the basis of meeting the heat-resistant performance. 2 or 54kW / m 2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the casing is maintained at no more than 180°C within 800 seconds. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a schematic diagram of the casing structure in Example 1 of the present invention;

[0014] Figure 2 This is a schematic diagram of the sleeve structure in Example 2 of the present invention. DETAILED DESCRIPTION

[0015] Various exemplary embodiments of the present invention will now be described in detail. This detailed description should not be considered as limiting the present invention, but should be understood as a more detailed description of certain aspects, features, and embodiments of the present invention. Example

[0016] like Figure 1 As shown, an extruded hollow heat-proof sleeve consists of a five-layer structure. The first layer is a hollow tube. The second layer is a three-proof paint layer impregnated and cured on the surface of the hollow tube. The third layer is an aluminum film treatment on the surface of the three-proof paint by starting vacuum evaporation coating. The fourth layer is a polyester fiber sleeve woven on the surface of the hollow tube after aluminum coating. The fifth layer is a polyimide film with double-sided aluminum film wound on the outer surface of the sleeve with 1 / 2 overlap.

[0017] The specific steps are as follows:

[0018] (1) Making mold

[0019] The customer's design department provides the dimension drawings of the instruments, meters and equipment to be protected, and the mold is processed according to the drawings;

[0020] (2) Rubber refining

[0021] Flame retardant internally mixed silicone rubber is refined with a rubber mixer with vulcanizer and internal mold release agent;

[0022] (3) Extrusion

[0023] The refined flame-retardant internally mixed silicone rubber is extruded into a hollow tube with a thickness of 1.3-1.5 mm by an extruder;

[0024] (4) Impregnation and curing of conformal coating

[0025] The hollow tube is dipped in conformal coating and baked in a vertical gluing machine at a temperature of 110°C for 40 minutes to completely cure the coating and make the conformal coating layer 0.03mm thick. The conformal coating layer is a silicone-based paint film.

[0026] (5) Vacuum aluminum plating on the surface of the three-conformal paint layer

[0027] Use iron wire to pass through the hollow tube to tie and fix it on the workpiece rack of the coating machine, push the workpiece rack into the coating machine, close the hatch, use 99.5% vacuum-plated aluminum ring, at 6.0×E -3 It is made of aluminum plating under a vacuum degree of Pa, with a thickness of 0.05mm;

[0028] (6) Impregnation with aerogel liquid

[0029] A 400D polyester fiber yarn is selected and coated with a certain aerogel impregnation liquid on its surface; the aerogel is prepared by adding an organic silane modifier to prepare a modified ZrO2-SiO2 precursor sol, and then aging and drying to obtain a high-temperature resistant modified ZrO2-SiO2 composite aerogel with a thermal conductivity of 0.018%;

[0030] (7) Curing

[0031] Bake on a vertical glue coating machine at a temperature of 100°C for 20 minutes to fully cure;

[0032] (8) Weaving a polyester fiber sleeve on the surface of the aluminum-plated hollow tube

[0033] The solidified polyester fiber yarn is twisted into 6 strands and then woven into a sleeve on a braiding machine. Six layers of polyester fiber sleeves are woven on the surface of the aluminum-plated hollow tube, with a thickness of 2.4-3.0 mm.

[0034] (9) Double-sided aluminum plating of polyimide film

[0035] Use double-sided tape to fix the polyimide film on the workpiece rack of the coating machine, push the workpiece rack into the coating machine, close the hatch, use 99.5% vacuum-plated aluminum ring, and place it on the 6.0×E -3 It is aluminum-plated under a vacuum degree of Pa, and the total thickness of the polyimide film after aluminum plating is 0.15mm;

[0036] (10) A 1 / 2 overlapped double-sided aluminum-plated polyimide film is used on the outer surface of the casing.

[0037] Cut the polyimide film at 45° to a width of about 30 mm, and wrap the cut film around the outer surface of the sleeve with a 1 / 2 overlap.

[0038] The extruded hollow heat-resistant sleeve prepared by the above method can be used at 40kW / m 2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the casing is maintained at no more than 180°C within 800 seconds. Example

[0039] like Figure 2 As shown, an extruded hollow heat-proof sleeve consists of a five-layer structure. The first layer is a hollow tube. The second layer is a three-proof paint layer impregnated and cured on the surface of the hollow tube. The third layer is an aluminum film treatment on the surface of the three-proof paint by starting vacuum evaporation coating. The fourth layer is a polyester fiber sleeve woven on the surface of the hollow tube after aluminum coating. The fifth layer is a polyimide film with double-sided aluminum film wound on the outer surface of the sleeve with 1 / 2 overlap.

[0040] The specific steps are as follows:

[0041] (1) Making mold

[0042] The customer's design department provides the dimension drawings of the instruments, meters and equipment to be protected, and the mold is processed according to the drawings;

[0043] (2) Rubber refining

[0044] Flame retardant internally mixed silicone rubber is refined with a rubber mixer with vulcanizer and internal mold release agent;

[0045] (3) Extrusion

[0046] The refined flame-retardant internally mixed silicone rubber is extruded into a hollow tube with a thickness of 1.3-1.5 mm by an extruder;

[0047] (4) Impregnation and curing of conformal coating

[0048] The hollow tube is dipped in conformal coating and baked in a vertical gluing machine at a temperature of 110°C for 60 minutes to fully cure the coating. The conformal coating layer thickness reaches 0.06mm.

[0049] (5) Vacuum aluminum plating on the surface of three-conformal paint

[0050] Use iron wire to pass through the hollow tube to tie and fix it on the workpiece rack of the coating machine, push the workpiece rack into the coating machine, close the hatch, use 99.5% vacuum-plated aluminum ring, at 6.0×E -3 It is made of aluminum plating under a vacuum degree of Pa, with a thickness of 0.03mm;

[0051] (6) Impregnation with aerogel liquid

[0052] A 400D polyester fiber yarn is selected and a certain aerogel impregnation liquid is coated on its surface; the aerogel is prepared by adding an organic silane modifier to a modified ZrO2-SiO2 precursor sol, and then aging and drying to obtain a high-temperature resistant modified ZrO2-SiO2 composite aerogel with a thermal conductivity of 0.018%;

[0053] (7) Curing

[0054] Bake on a vertical glue coating machine at a temperature of 100°C for 20 minutes to fully cure;

[0055] (8) Weaving a polyester fiber sleeve on the surface of the aluminum-plated hollow tube

[0056] The cured polyester fiber yarn is twisted into 6 strands and then woven into a sleeve on a braiding machine. Seven layers of polyester fiber sleeves are woven on the surface of the aluminum-plated hollow tube with a thickness of 2.8-3.5 mm.

[0057] (9) Double-sided aluminum plating of polyimide film

[0058] Use double-sided tape to fix the polyimide film on the workpiece rack of the coating machine, push the workpiece rack into the coating machine, close the hatch, use 99.5% vacuum-plated aluminum ring, and place it on the 6.0×E -3 It is aluminum-plated under a vacuum degree of Pa, and the total thickness of the polyimide film after aluminum plating is 0.15mm;

[0059] (10) A 1 / 2 overlapped double-sided aluminum-plated polyimide film is used on the outer surface of the casing.

[0060] Cut the film at 45° to a width of about 30 mm, and wrap the cut film around the outer surface of the sleeve with a 1 / 2 overlap.

[0061] The extruded hollow heat-resistant sleeve prepared by the above method can be used at 54kW / m2 Under vacuum heat flow conditions, the temperature rise of the inner wall of the casing is maintained at no more than 180°C within 800 seconds.

[0062] The above embodiments are preferred implementation schemes of the present invention. In addition, the present invention may also be implemented in other ways. Any obvious replacement without departing from the concept of the present technical solution is within the protection scope of the present invention.

[0063] In order to make it easier for ordinary technicians in the field to understand the improvements of the present invention over the prior art, some drawings and descriptions of the present invention have been simplified, and for the sake of clarity, some other elements are omitted in this application document. Ordinary technicians in the field should realize that these omitted elements may also constitute the content of the present invention.

Claims

1. An extruded hollow heat-resistant sleeve, It is characterized in that The heat-proof sleeve has a five-layer structure, which is as follows from the inside to the outside: the first layer is a hollow tube extruded from flame-retardant internally kneaded silicone rubber, the second layer is a three-proof paint layer, the third layer is an aluminum-plated film, the fourth layer is a polyester fiber sleeve, and the fifth layer is a polyimide film with aluminum film on both sides, which is wound on the outer surface of the sleeve with a 1 / 2 overlap; the three-proof paint layer is a silicone paint film; the polyester fiber sleeve is a sleeve formed by coating aerogel on the surface of polyester fiber yarn, twisting it into 6 strands of yarn and then weaving it; the aerogel is a high-temperature resistant modified ZrO2-SiO2 composite aerogel obtained by adding an organic silane modifier.

2. The extruded hollow heat-resistant sleeve according to claim 1, Features: The thickness of the hollow tube is 1.3-1.5 mm.

3. The extruded hollow heat-resistant sleeve according to claim 1, Features: The thickness of the three-proof paint layer is 0.03~0.06mm.

4. The extruded hollow heat-resistant sleeve according to claim 1, Features: The aluminized film is made of 99.5% vacuum aluminized aluminum ring. -3 Pa, and the thickness is 0.01~0.05mm.

5. The extruded hollow heat-resistant sleeve according to claim 1, Features: The polyester fiber sleeve is made of 400D polyester fiber yarn, a certain aerogel impregnation liquid is coated on the surface of the yarn, and then the yarn is twisted into 6 strands and then woven into a sleeve, with a thickness of 1.8-3.5 mm.

6. The extruded hollow heat-resistant sleeve according to claim 1, Features: The thickness of the polyimide film is 0.05-0.06 mm.

7. The extruded hollow heat-resistant sleeve according to claim 1, Features: The polyimide film is made of 99.5% vacuum-plated aluminum. -3 Pa vacuum degree aluminum plating.

8. The extruded hollow heat-resistant sleeve according to claim 3, Features: The three-proof paint layer is dipped into the three-proof paint on the hollow tube, and is baked in a vertical gluing machine at a baking temperature of 100-120°C for 40-60 minutes to completely cure the coating, and the thickness of the three-proof paint layer reaches 0.03-0.06mm.

9. The extruded hollow heat-resistant sleeve according to claim 5, Features: The aerogel is prepared by adding an organic silane modifier to modify ZrO 2 -SiO 2 Precursor sol, and then after aging and drying, high temperature resistant modified ZrO 2 -SiO 2 Composite aerogel, thermal conductivity is 0.018%.

10. The extruded hollow heat-resistant sleeve according to claim 5, Features: After a certain amount of aerogel impregnation liquid is coated on the surface of the polyester fiber yarn, it is baked in a vertical glue coating machine at a baking temperature of 100-120°C and a baking time of 15-30 minutes to fully solidify it.

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