Ceramic flame-retardant composite film with heat insulation and fire resistance

Abstract

The utility model discloses a ceramic flame-retardant composite film with heat insulation and fire resistance, which comprises a glass fiber layer, polyolefin layers arranged on two sides of the glass fiber layer, a ceramic filling layer arranged between the polyolefin layers and the glass fiber layer, and release paper arranged on the outer sides of the polyolefin layers, the release paper and the polyolefin layer are compounded through a pressure-sensitive adhesive, the polyolefin layer is used for reducing fire spreading, the ceramic filling layer is used for forming a ceramic body in the combustion process, and the glass fiber layer is used for preventing the ceramic filling layer from falling off due to high-strength vibration after the ceramic body is formed and providing heat insulation capacity. The flexibility of the composite film and the strength of a formed ceramic body are effectively guaranteed, the requirements for fire resistance and flame retardance are met, the structural stability of the composite film is improved, and the heat insulation capacity is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of ceramic polyolefin composite materials, in particular to a ceramic flame-retardant composite film with heat-insulating and fire-resistant properties. Background Art

[0002] Ordinary polymer films will burn and crack when exposed to open flames, eventually becoming loose powders that cannot protect the internal structure. With the development of technology, people have higher demands for materials that are both flame retardant and fire resistant. Ceramic polyolefin is a type of composite material that can quickly form porcelain after being heated, forming a strong and dense ceramic layer. It can form a ceramic body covering the surface during a fire, maintaining structural stability and providing a certain degree of protection for the internal structure. This gives ceramic polyolefin good application prospects in electricity, transportation and other aspects. However, the film made of ceramic polyolefin cannot form porcelain at too low a temperature. At this time, dripping will occur after ablation, causing secondary damage, and the thermal insulation effect itself is not excellent. Therefore, there is a need for a ceramic flame retardant composite film with thermal insulation and fire resistance. Summary of the Invention

[0003] In order to solve certain technical problems existing in the prior art, the purpose of this application is to provide a ceramic flame-retardant composite film with thermal insulation and fire-resistant properties, which effectively ensures the flexibility of the composite film and the strength of the ceramic body after molding, meets the requirements of fire resistance and flame retardancy, and also improves the structural stability of the composite film and improves the thermal insulation capacity.

[0004] To solve the above existing technical problems, this application adopts the following technical solutions:

[0005] A ceramic flame-retardant composite film with heat-insulating and fire-resistant properties, characterized in that it includes a glass fiber layer, a polyolefin layer arranged on both sides of the glass fiber layer, a ceramic filling layer arranged between the polyolefin layer and the glass fiber layer, and a release paper on the outside of the polyolefin layer, the release paper and the polyolefin layer are composited with a pressure-sensitive adhesive, the polyolefin layer is used to reduce the spread of fire, the ceramic filling layer is used to form a ceramic body during the combustion process, and the glass fiber layer is used to prevent the ceramic filling layer from falling off due to high-intensity vibration after forming the ceramic body, and provides heat insulation capabilities.

[0006] Preferably, the release paper is provided with an easy-tear corner, and there is no pressure-sensitive adhesive between the easy-tear corner and the polyolefin layer.

[0007] Preferably, the tearable corner is a triangular structure.

[0008] Preferably, the polyolefin layer is made of ethylene-vinyl acetate copolymer (EVA) or a composite material of polyethylene (PE) and metal hydroxide, and has a thickness of 0.3-1 mm.

[0009] Preferably, the processing temperature of the polyolefin layer is 150-180°C.

[0010] Preferably, the thickness of the ceramic filling layer is 0.3-0.8 mm.

[0011] Preferably, the ceramic filling layer is a mixture of polyolefin, inorganic powder and EVA or PE.

[0012] Preferably, the inorganic powder is a mixed powder of metal hydroxide, clay, flux and silicone oil.

[0013] Preferably, the glass fiber has a thickness of 0.3-0.5 mm.

[0014] Compared with the prior art, the beneficial effects of the present invention are:

[0015] When exposed to flames, the ceramic flame-retardant composite film can insulate and reduce the spread of fire through the outermost polyolefin layer. At the same time, the ceramic filling layer quickly forms a ceramic body after being exposed to the heat generated during the combustion process, thus achieving a flame-retardant effect. Finally, the middle glass fiber layer effectively prevents the ceramic filling layer from falling off due to high-intensity vibration after forming the ceramic body, and provides further insulation, allowing the ceramic flame-retardant composite film to perform its protective role at lower temperatures. The formation of a sandwich structure between the flame-retardant polyolefin layer and the ceramic filling layer solves the problem of the ceramic filling layer dripping when burned by flames, takes into account the flexibility of the flame-retardant polyolefin layer and the strength of the ceramic body after forming, protects the morphology of the ceramic filling layer before ceramic formation, and ensures the structural stability of the ceramic filling layer during the ceramic formation process, meeting the requirements of fire resistance and flame retardancy. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a side sectional view of the utility model;

[0017] Figure 2 This is a top view of the present invention, showing the structure when the easy-tear corner is partially torn off;

[0018] In the figure: 1. Polyolefin layer; 2. Ceramic filling layer; 3. Glass fiber layer; 4. Release paper; 5. Easy-tear corner; 6. Pressure-sensitive adhesive. DETAILED DESCRIPTION

[0019] Below, the present application is further described in conjunction with the accompanying drawings and specific implementation methods. It should be noted that, under the premise of no conflict, the various embodiments or technical features described below can be arbitrarily combined to form new embodiments.

[0020] In the description of this application, it should be understood that the terms "up", "down", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they should not be understood as limitations on this application.

[0021] The terms "first," "second," and the like in this application are used to distinguish similar objects, and are not used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of this application can be implemented in an order other than that illustrated or described herein, and that the objects distinguished by "first," "second," and the like are generally of the same type, and do not limit the number of objects; for example, the first object can be one or more. In addition, "and / or" in the specification and claims refers to at least one of the connected objects, and the character " / " generally indicates that the objects connected are in an "or" relationship.

[0022] like Figure 1 and Figure 2 As shown, a ceramic flame retardant composite film with heat insulation and fire resistance properties includes a glass fiber layer 3, a polyolefin layer 1 arranged on both sides of the glass fiber layer 3, a ceramic filling layer 2 arranged between the polyolefin layer 1 and the glass fiber layer 3, and a release paper 4 on the outside of the polyolefin layer 1. The release paper 4 and the polyolefin layer 1 are compounded by a pressure-sensitive adhesive 6. The polyolefin layer 1 is used to reduce the spread of fire, the ceramic filling layer 2 is used to form a ceramic body during combustion, and the glass fiber layer 3 is used to prevent the ceramic filling layer 2 from falling off due to high-intensity vibration after forming a ceramic body, and provides heat insulation capabilities.

[0023] In actual practical application, the ceramic flame retardant composite film is composed of a middle glass fiber layer 3, and a ceramic filling layer 2 and a polyolefin layer 1 respectively located on both sides of the glass fiber layer 3. The outer side of one polyolefin layer 1 is also coated with a pressure-sensitive adhesive 6 and a release paper 4. When the ceramic flame retardant composite film is needed, it is only necessary to tear off the release paper 4 to be able to adhere it through the pressure-sensitive adhesive 6. It is more convenient to use and can be flexibly used according to different environmental requirements. When the ceramic flame retardant composite film is exposed to fire, the flame and high temperature are first combined through the outermost polyolefin layer 1. Compared with ceramic polyolefin, flame retardant polyolefin can play a protective role at a lower temperature. By generating gas to isolate oxygen, it hinders the spread of fire, thereby achieving heat insulation and reducing the speed of fire spread. It also has good anti-dripping ability and heat insulation ability. However, if it is ablated for a long time at a higher temperature, the flame retardant ability will be broken down. Therefore, a ceramic filling layer 2 is filled on the inside. The ceramic filling layer 2 can quickly form a ceramic body after being heated, thereby achieving a flame retardant effect. However, the ceramic body will fall off under strong vibrations. Therefore, a glass fiber layer 3 is added in the middle. Finally, the middle glass fiber layer 3 can effectively prevent the ceramic filling layer 2 from falling off due to high-intensity vibrations after forming the ceramic body, and provide heat insulation capacity again, so that the ceramic flame retardant composite film can play a protective role at a lower temperature. The flame retardant polyolefin layer 1 and the ceramic filling layer 2 form a sandwich structure, which solves the problem of the ceramic filling layer 2 dripping when burned by flames, takes into account the flexibility of the flame retardant polyolefin layer 1 and the strength of the ceramic body after forming, protects the morphology of the ceramic filling layer 2 before ceramic formation, and ensures the structural stability of the ceramic filling layer 2 during the ceramic formation process, meeting the requirements of fire resistance and flame retardancy.

[0024] A further improvement is that the release paper 4 is provided with an easy-tear corner 5, and there is no pressure-sensitive adhesive 6 between the easy-tear corner 5 and the polyolefin layer 1; the easy-tear corner 5 is a triangular structure.

[0025] A pressure-sensitive adhesive 6 is applied to the underside of the release paper 4, and a tear-off corner 5 is provided on the release paper 4. The tear-off corner 5 is triangular in shape, which maximizes the force and makes it easy to peel off the release paper 4. There is no pressure-sensitive adhesive 6 on the edge of the tear-off corner 5, and the exposed area is the polyolefin layer 1, which is convenient for grasping the tear-off corner 5.

[0026] A further improvement is that the polyolefin layer 1 is made of ethylene-vinyl acetate copolymer (EVA) or a composite material of polyethylene (PE) and metal hydroxide, with a thickness of 0.3-1 mm.

[0027] The polyolefin layer 1 is fully mixed in a high-speed mixer and then formed by tape casting, which is more convenient to form and has a thickness of 0.3-1 mm, which can make the ceramic flame-retardant composite film thinner.

[0028] As a further improvement, the processing temperature of the polyolefin layer 1 is 150-180° C., and the polyolefin layer 1 can be composited with the ceramic filling layer 2 in a low temperature environment.

[0029] A further improvement is that the thickness of the ceramic filling layer 2 is 0.3-0.8 mm, which can make the thickness of the formed ceramic flame-retardant composite film thinner and have a better flame-retardant effect.

[0030] A further improvement is that the ceramic filling layer 2 is a mixture of polyolefin, inorganic powder and EVA or PE.

[0031] The upper and lower ends of the ceramic flame-retardant composite film are both flame-retardant polyolefin layers 1, and the core is a glass fiber layer 3. A mixture of polyolefin, inorganic powder and EVA or PE is used for filling between the polyolefin layer 1 and the core glass fiber layer 3. The inorganic powder can enable the ceramic filling layer 2 to form a ceramic body during the flame ablation process, protecting the structure from collapse. Polyolefin accounts for about 10-20% of the mass, and the processing temperature of the polyolefin used is 150-180°C; connection is carried out by hot pressing, which can better take into account the flexibility of polyolefin and the strength of the ceramic body after molding, meeting the requirements of fire resistance and flame retardancy.

[0032] A further improvement is that the inorganic powder is a mixed powder of metal hydroxide, clay, flux and silicone oil.

[0033] Metal hydroxide can hinder heat transfer, improve anti-dripping ability, and further provide flame retardant ability. In the flame retardant composite film, when the content of metal hydride is higher than 70%, it will affect the toughness of the film, causing the composite structure to have brittle fracture. However, when the content is lower than 60%, it will affect the flame retardant ability of the film, and further, it will reduce the anti-dripping ability of the overall structure, and may cause the ceramic filling layer 2 to be punctured before the ceramic is completed. In practical applications, therefore, it is generally controlled at about 75%. And the increase of silicone oil can better improve the processing performance, generally accounting for about 2%-4%.

[0034] A further improvement is that the glass fiber has a thickness of 0.3-0.5 mm.

[0035] The glass fiber layer 3 is a fireproof cloth made of glass fiber with a thickness of 0.3-0.5 mm. It can ensure a stable structure, prevent the ceramic body from falling off due to high-intensity vibration after ceramicization, and provide heat insulation capabilities with a thinner thickness.

[0036] The present invention can adopt thicker layers to obtain a ceramic polyolefin board with enhanced thermal insulation. When the thickness is greater than 5 cm, the temperature of the unheated surface is about 500°C after being subjected to flame ablation at 1000°C ± 50°C.

[0037] The above-mentioned embodiments are only preferred embodiments of the present application and cannot be used to limit the scope of protection of the present application. Any non-substantial changes and replacements made by technicians in this field based on the present application shall fall within the scope of protection required by the present application.

Claims

1. A ceramic flame-retardant composite film with heat-insulating and fire-resistant properties, characterized by: The invention comprises a glass fiber layer (3), a polyolefin layer (1) provided on both sides of the glass fiber layer (3), a ceramic filling layer (2) provided between the polyolefin layer (1) and the glass fiber layer (3), and a release paper (4) outside the polyolefin layer (1), wherein the release paper (4) and the polyolefin layer (1) are compounded by a pressure-sensitive adhesive (6), the polyolefin layer (1) is used to reduce the spread of fire, the ceramic filling layer (2) is used to form a ceramic body during the combustion process, and the glass fiber layer (3) is used to prevent the ceramic filling layer (2) from falling off due to high-intensity vibration after forming the ceramic body, and provides heat insulation capability.

2. The ceramic flame-retardant composite film with heat-insulating and fire-resistant properties according to claim 1, characterized in that: The release paper (4) is provided with an easy-tear corner (5), and there is no pressure-sensitive adhesive (6) between the easy-tear corner (5) and the polyolefin layer (1).

3. The ceramic flame-retardant composite film with heat-insulating and fire-resistant properties according to claim 2, characterized in that: The tear-away corner (5) is a triangular structure.

4. The ceramic flame-retardant composite film with heat-insulating and fire-resistant properties according to claim 2, characterized in that: The processing temperature of the polyolefin layer (1) is 150-180°C.

5. The ceramic flame-retardant composite film with heat-insulating and fire-resistant properties according to claim 2, characterized in that: The thickness of the ceramic filling layer (2) is 0.3-0.8 mm.

6. The ceramic flame-retardant composite film with heat-insulating and fire-resistant properties according to claim 1, characterized in that: The glass fiber has a thickness of 0.3-0.5 mm.

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