Bending-resistant expansion type heat insulation ceramic silicone rubber composite belt

Abstract

The utility model relates to a bending-resistant expansion type heat-insulating ceramic silicone rubber composite belt, which sequentially comprises an expansion type heat-insulating ceramic silicone rubber layer, a fabric layer and a fire-resistant ceramic silicone rubber layer from top to bottom, and all the layers are tightly attached to one another. The intumescent heat-insulating ceramic ceramic silicone rubber layer is prepared from efficient ceramic flame-retardant powder and foaming organic silicon components, and the fabric layer is a glass fiber cloth layer; and the fire-resistant ceramic silicone rubber layer is prepared from low-temperature ceramic flame-retardant powder and an organic silicon component. The composite belt has the characteristics of excellent fire prevention, flame retardance, heat insulation, low smoke, no toxicity and the like, the expansion rate can reach 1-2 times, and the composite belt has good fire prevention and heat insulation effects. After combustion, the expansion type heat insulation ceramic ceramic silicone rubber layer forms a hard ceramic porous shell, and the fire-resistant ceramic silicone rubber layer forms a high-hardness and densified ceramic solid, so that the fireproof reliability of the composite belt is ensured.

Description

TECHNICAL FIELD

[0001] The utility model relates to an anti-bending intumescent heat-insulating ceramicized silicone rubber composite tape and belongs to the technical field of new materials. BACKGROUND

[0002] The ceramicized flame-retardant silicone rubber exhibits excellent performance similar to that of ordinary silicone rubber at room temperature, including good flexibility, insulation performance, aging resistance, etc. Its significant feature is that when exposed to open flame or high-temperature environment, the ceramicized silicone rubber can be sintered into a ceramic body with certain self-supporting property, effectively preventing the spread of fire to the inside of the material, thus playing a fireproof role. With the wide application of ceramicized flame-retardant silicone rubber materials in the fields of power, electronic equipment, automobiles, etc., the requirements for the performance of the products are constantly improving.

[0003] In the field of new energy vehicles, lithium ion batteries are the main power source, but there are certain safety hazards in the use of lithium ion batteries, especially in the case of overcharging, scratching, extrusion, and puncture, which are prone to thermal runaway. Common ceramicized flame-retardant silicone rubber composite tapes are usually composed of a fabric layer with ceramicized silicone rubber attached to one or both sides. For example, patent number CN207028393U discloses a new battery safety heat-conducting and heat-insulating sheet. This structure can provide good flame-retardant and fireproof performance in a short time, but under the continuous impact of fire, the composite tape may crack at some positions, resulting in the loss of fireproof function. In addition, the modified silicone rubber ceramicized mica fire-resistant composite tape disclosed in patent number CN206170780U improves the fire resistance and moisture resistance of the composite tape by adding a layer of mica between the ceramicized silicone rubber layer and the glass fiber cloth layer. Although the melting combination of the ceramicized silicone rubber layer and the mica layer improves the cracking problem under the continuous impact of fire, heat is still continuously transferred from the surface to the back of the composite tape, causing the combustible material on the back to reach the ignition point and burn, which may still pose a threat to the safety of people's lives and property in extreme cases.

[0004] In summary, the existing ceramicized flame-retardant silicone rubber composite tape cannot fully meet the demand for fireproof and heat-insulating, so it is urgent to design a ceramicized silicone rubber composite tape with good anti-bending performance and intumescent heat-insulating function to improve its overall fireproof and heat-insulating performance. UTILITY MODEL CONTENTS

[0005] The utility model aims at the defects and deficiencies of the prior art and provides an anti-bending intumescent heat-insulating ceramicized silicone rubber composite tape with simple structure, reasonable design, high efficiency, safety, reliability, etc.

[0006] To achieve the above-mentioned purpose, the utility model adopts the technical scheme of:

[0007] The anti-bending intumescent ceramicized silicone rubber composite tape comprises an intumescent ceramicized silicone rubber layer, a fabric layer and a ceramicized fireproof silicone rubber layer.

[0008] The anti-bending intumescent ceramicized composite tape body is composed of the intumescent ceramicized silicone rubber layer, the fabric layer and the fireproof ceramicized silicone rubber layer from top to bottom, and the layers are tightly adhered.

[0009] The intumescent ceramicized silicone rubber layer is made of high-efficiency ceramicized fire-retardant powder and foamable silicone components.

[0010] The fabric layer is a glass fiber cloth layer, and the thickness of the fabric layer is 0.1-0.2mm.

[0011] The fireproof ceramicized silicone rubber layer is made of low-temperature ceramicized fire-retardant powder and silicone components.

[0012] The specific preparation method of the anti-bending intumescent ceramicized silicone rubber composite tape is as follows: the fireproof ceramicized silicone rubber layer 3 is adhered to one side of the fabric layer 2 through a calendering process, and then vulcanized and formed at 120 DEG C to obtain a fireproof ceramicized silicone rubber composite tape; the intumescent ceramicized silicone rubber layer 1 is adhered to the other side of the fabric layer 2 in the fireproof ceramicized silicone rubber composite tape through a calendering process, and then vulcanized and formed at 120 DEG C to obtain the anti-bending intumescent ceramicized silicone rubber composite tape.

[0013] In the above technical solution, the technical effects and advantages of the anti-bending intumescent ceramicized silicone rubber composite tape are as follows:

[0014] (1) At room temperature, the strength and rigidity of the composite tape prepared by the utility model are equivalent to those of conventional ceramicized silicone rubber composite tape, which not only ensures the mechanical properties during daily use, but also makes the material have strong adaptability and reliability. In a high-temperature environment, the composite material has excellent flame retardant and heat insulation performance, can effectively block the erosion of fire, and protect the underlying structure or component from fire damage.

[0015] (2) The expansion type heat insulation ceramicized porcelain silicon rubber layer of the composite tape prepared by the utility model has the functions of fireproofing and heat insulation. When heated, the expansion type heat insulation ceramicized silicone rubber layer on the surface rapidly absorbs heat and expands to form a hard porous ceramicized flame-retardant layer, which can quickly respond and provide effective flame isolation; secondly, the porous ceramicized flame-retardant layer can act as a heat insulation layer, which can slowly and uniformly conduct heat from the surface to the back of the fireproof ceramicized silicone rubber layer, thereby maintaining the stability of the material and preventing the back material from being affected by excessive temperature.

[0016] (3) The fireproof ceramicized silicone rubber layer of the composite tape prepared by the utility model can form a porcelain structure under low thermal shock conditions, has better ceramic density and strength, thereby enhancing the fireproof performance and durability of the overall material. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the drawings needed in the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments described in the utility model, and other drawings can also be obtained by those skilled in the art according to these drawings.

[0018] Figure 1 is the structure diagram of the bending-resistant expansion type heat insulation ceramicized silicone rubber composite tape prepared by specific embodiment one, which comprises an expansion type heat insulation ceramicized silicone rubber layer 1, a fabric layer 2 and a fireproof ceramicized silicone rubber layer 3, and the volume change schematic diagram before and after combustion. DETAILED DESCRIPTION

[0019] The utility model will be further described below in combination with the drawings. Specific embodiment one:

[0021] Referring to the drawings, Figure 1As shown, the present embodiment comprises an intumescent thermal insulation ceramicized silicone rubber layer 1, a fabric layer 2, and a fire-resistant ceramicized silicone rubber layer 3. The intumescent thermal insulation ceramicized silicone rubber layer 1 is a colloid prepared by using a compound powder of wollastonite, calcium carbonate, and silicon dioxide as a ceramic-forming filler, and by using vinyl silicone oil, hydrogen-containing silicone oil, hydroxyl silicone oil, a foaming agent, an inhibitor, and a platinum-gold catalyst. The fabric layer 2 is a 0.1 mm glass fiber cloth. The fire-resistant ceramicized silicone rubber layer 3 is a colloid prepared by using a compound powder of wollastonite, aluminum oxide, and silicon dioxide as a ceramic-forming filler, and by using low-melting-point glass powder and magnesium oxide as fluxing agents, and by using vinyl silicone oil, hydrogen-containing silicone oil, an inhibitor, and a platinum-gold catalyst. The fire-resistant ceramicized silicone rubber layer 3 is adhered to one side of the fabric layer 2 by a calendering process, and is vulcanized and formed at 120°C to obtain a fire-resistant ceramicized silicone rubber composite tape, wherein the design thickness of the fire-resistant ceramicized silicone rubber layer 3 is 0.4 mm. Subsequently, the intumescent thermal insulation ceramicized silicone rubber layer 1 is attached to the other side of the fabric layer 2 in the fire-resistant ceramicized silicone rubber composite tape by a calendering process, and is vulcanized and formed at 120°C to obtain a bending-resistant intumescent thermal insulation ceramicized silicone rubber composite tape, wherein the design thickness of the intumescent thermal insulation ceramicized silicone rubber layer 1 is 0.5 mm. The bending-resistant intumescent thermal insulation ceramicized silicone rubber composite tape obtained is subjected to tests of thermal insulation performance, volume expansion rate, and three-point bending strength, and the test results are listed in Table 1. Embodiment Two

[0023] The present embodiment differs from Embodiment One in that the design thickness of the fire-resistant ceramicized silicone rubber layer 3 is 0.2 mm, the design thickness of the intumescent thermal insulation ceramicized silicone rubber layer 1 is 0.7 mm, and the remaining steps are the same as in Embodiment One. The bending-resistant intumescent thermal insulation ceramicized silicone rubber composite tape obtained is subjected to tests of thermal insulation performance, volume expansion rate, and three-point bending strength, and the test results are listed in Table 1.

[0024] Specific Comparative Example One

[0025] The present embodiment comprises an intumescent thermal insulation ceramicized silicone rubber layer 1, which is an intumescent thermal insulation ceramicized silicone rubber obtained by using a compound powder of wollastonite, calcium carbonate, and silicon dioxide as a ceramic-forming filler, and by using vinyl silicone oil, hydrogen-containing silicone oil, hydroxyl silicone oil, a foaming agent, an inhibitor, and a platinum-gold catalyst to prepare a colloid, and by calendering and vulcanization. The design thickness of the intumescent thermal insulation ceramicized silicone rubber is 1.0 mm. The intumescent thermal insulation ceramicized silicone rubber obtained is subjected to tests of thermal insulation, volume expansion rate, and three-point bending strength, and the test results are listed in Table 1.

[0026] Specific Comparative Example Two

[0027] This specific comparative example contains an intumescent thermal insulation ceramicized silicone rubber layer 1, a fabric layer 2, the intumescent thermal insulation ceramicized silicone rubber layer 1 is made of a compound powder of wollastonite, calcium carbonate, and silicon dioxide as a ceramic filler, combined with vinyl silicone oil, hydrogen-containing silicone oil, hydroxyl silicone oil, foaming agent, inhibitor, platinum catalyst to form a colloid, and then adhered to one side of the fabric layer 2 through a calendering process, and vulcanized and formed at 120°C to obtain an intumescent thermal insulation ceramicized silicone rubber composite tape, with a designed thickness of 0.7 mm. The fabric layer 2 is a 0.1 mm glass fiber cloth. The prepared intumescent thermal insulation ceramicized silicone rubber composite tape is tested for thermal insulation performance, volume expansion rate, and three-point bending strength, and the test results are shown in Table 1.

[0028] Specific Comparative Example Three:

[0029] The difference between this specific comparative example three and specific comparative example two is that the designed thickness of the intumescent thermal insulation ceramicized silicone rubber layer 1 is 0.5 mm, and the rest of the steps are the same as specific comparative example two. The prepared intumescent thermal insulation ceramicized silicone rubber composite tape is tested for thermal insulation performance, volume expansion rate, and three-point bending strength, and the test results are shown in Table 1.

[0030] The performance test methods are as follows:

[0031] (1) Measurement method of surface temperature of silicone rubber during combustion:

[0032] The test uses a butane spray gun as a heat source, with a flame length of about 10-15 cm, and the distance between the spray gun nozzle and the test sample is 5-7 cm. The flame temperature is measured by a K-type thermocouple before the test, and the flame temperature is required to be within the range of 1150-1300°C.

[0033] Before the test, two or more K-type thermocouples are fixed on both sides of the silicone rubber / composite tape to observe the temperature changes on the burning surface and the back surface of the silicone rubber / composite tape during combustion, and record the highest temperature T1(℃) on the burning surface and the highest temperature T2(℃) on the back surface.

[0034] (2) Test method of volume expansion rate:

[0035] The thickness of the silicone rubber / composite tape before combustion is measured using the three-point method to obtain the average thickness H1(mm) of the silicone rubber / composite tape before combustion. After the silicone rubber / composite tape is burned, the thickness of the silicone rubber / composite tape after combustion is measured using the three-point method to obtain the average thickness H2(mm) of the silicone rubber / composite tape after combustion. The volume expansion rate V exp (%) is calculated according to the formula, where H p (mm) is the set thickness of the intumescent thermal insulation ceramicized silicone rubber layer 1.

[0036] Volume expansion rate

[0037] (3) Test method of three-point bending strength:

[0038] The three-point bending strength of the silicone rubber / compound tape after combustion was determined according to GBT 1965-1996.

[0039] Table 1 shows the test results of the thermal insulation performance, volume expansion rate and three-point bending strength of the products prepared in each example and comparative example.

[0040] Table 1

[0041]

[0042] Note: The thickness of each layer in Table 1 is set as the thickness of the intumescent thermal insulation ceramicized silicone rubber layer 1, the fabric layer 2 and the fire-resistant ceramicized silicone rubber layer 3 in sequence.

[0043] The product prepared in the examples and comparative examples has an original thickness of 0.6-1.0 mm, and the temperature on the back of the product is lower than 300℃ when facing high temperature above 1150℃. The volume expansion rate is as high as 140%-220%, the product has excellent thermal insulation performance and can block the spread of flame in extreme conditions. However, compared with the comparative examples, the bending strength of the compound tape after ceramicization is greatly improved in the first and second examples of the present application due to the addition of the fire-resistant ceramicized silicone rubber layer, thereby bringing more reliable fireproof performance.

[0044] The above description is only used to explain the technical solutions of the present application but not to limit the present application. Other modifications or equivalent replacements to the technical solutions of the present application made by those skilled in the art should be covered in the scope of the claims of the present application as long as they do not depart from the spirit and scope of the present application.

Claims

1. A bend-resistant intumescent thermally insulated ceramifiable silicone rubber composite tape, characterized in that: The composite tape comprises an intumescent thermal insulation ceramicized silicone rubber layer, a fabric layer and a fire-resistant ceramicized silicone rubber layer; from top to bottom, the layers are the intumescent thermal insulation ceramicized silicone rubber layer, the fabric layer and the fire-resistant ceramicized silicone rubber layer, and the layers are tightly attached to each other.

2. The anti-bending intumescent ceramicized silicone rubber composite tape according to claim 1, characterized in that: The intumescent thermal insulation ceramicized silicone rubber layer is made of high-efficiency ceramicized fire-retardant powder and foamable organic silicon components, and the thickness of the intumescent thermal insulation ceramicized silicone rubber layer is 0.1-1.0 mm.

3. The anti-bending intumescent ceramicized silicone rubber composite tape according to claim 1, characterized in that: The fabric layer is a glass fiber cloth layer, and the thickness of the fabric layer is 0.1-0.2 mm.

4. The anti-buckling intumescent ceramicized silicone rubber composite tape according to claim 1, characterized in that: The fire-resistant ceramicized silicone rubber layer is made of low-temperature ceramicized fire-retardant powder and organic silicon components, and the thickness of the fire-resistant ceramicized silicone rubber layer is 0.1-0.5 mm.

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