Fireproof flame-retardant paper

Abstract

The invention belongs to the technical field of flame-retardant paper, and particularly relates to fireproof flame-retardant paper which comprises a base paper layer, the base paper layer is a basic structure layer of the fireproof flame-retardant paper, high-strength fiber raw materials are adopted to enhance the physical performance of the base paper layer, a flame-retardant coating is arranged on the base paper layer, a protective outer layer is arranged on the outer layer of the flame-retardant coating, and the protective outer layer is arranged on the outer layer of the flame-retardant coating. And a bonding layer is arranged at the bottom of the base paper layer. According to the invention, the base paper layer is mixed with fibrilia or carbon fiber in a specific proportion to enhance the physical properties and can adapt to various external force environments, the flame-retardant coating contains nano magnesium hydroxide and the like, fire spreading is effectively prevented, the polyimide film of the protective outer layer provides high temperature, wear and chemical corrosion protection, the service life of the paper is prolonged, and the service life of the paper is prolonged. And the organic silicon adhesive of the bonding layer ensures firm bonding, the release paper layer is convenient to use, the overall performance is comprehensively improved, and the application is wide.

Description

Technical Field

[0001] The invention relates to the technical field of flame retardant paper, in particular to fireproof and flame retardant paper. Background Art

[0002] In modern society, fire safety issues are increasingly receiving widespread attention. With the increasing requirements for fire protection in various fields such as construction, electricity, and archive preservation, traditional paper has great safety hazards in many occasions due to its flammability. Therefore, it is urgent to develop a paper with good fire retardant properties.

[0003] Ordinary paper is usually made of pure wood pulp fibers, which have a low limiting oxygen index. It is easily ignited in the air and burns quickly. Once a fire occurs, it is easy to spread and it is difficult to play an effective fire prevention role.

[0004] Traditional paper also has certain limitations in terms of strength, and it is difficult to meet the needs of some special occasions for high-strength materials. For example, in architectural decoration, paper needs to be able to withstand certain external forces and impacts, and ordinary paper is often not up to the task.

[0005] In some specific environments, such as the electrical industry and archives, ordinary paper may be corroded by chemicals, affected by moisture, or harmed by static electricity. Ordinary paper is flammable and has no insulating properties around electrical equipment, which can easily cause electrical fires. In archives, ordinary paper may become moldy and damaged in a humid environment, or accumulate static electricity in a dry environment, causing a fire risk.

[0006] With the continuous advancement of science and technology, people have higher and higher requirements for the performance of fireproof and flame-retardant materials. On the one hand, the material is required to have efficient flame-retardant properties and be able to quickly prevent the spread of fire when a fire occurs; on the other hand, the material is also expected to have good physical properties, chemical stability and ease of use. For example, in the construction industry, fireproof materials are not only required to be able to prevent fire, but also required to have certain decorativeness and processability; in the electrical industry, fireproof materials need to have both insulation and flame-retardant properties. Therefore, the development of a fireproof and flame-retardant paper with excellent comprehensive performance has become a current research hotspot and development trend. Summary of the invention

[0007] 1. Technical issues to be resolved

[0008] In view of the deficiencies of the prior art, the present invention provides a fire-resistant and flame-retardant paper, which solves the problems raised in the above-mentioned background technology.

[0009] (II) Technical solution

[0010] In order to achieve the above-mentioned purpose, the present invention specifically adopts the following technical solutions:

[0011] A fireproof and flame-retardant paper comprises a base paper layer, which is the basic structural layer of the fireproof and flame-retardant paper. A high-strength fiber raw material is used to enhance the physical properties of the base paper layer. A flame-retardant coating is arranged on the base paper layer, a protective outer layer is arranged on the outer layer of the flame-retardant coating, and an adhesive layer is arranged on the bottom of the base paper layer.

[0012] Furthermore, the base paper layer is prepared by mixing 10%-30% hemp fiber or 3%-10% carbon fiber into traditional wood pulp fiber.

[0013] Furthermore, the flame retardant coating is composed of a flame retardant, a binder and other additives, nano magnesium hydroxide is the flame retardant component, the binder is a polyurethane resin, and other additives include a dispersant and a thickener.

[0014] Furthermore, the protective outer layer is a polyimide film.

[0015] Furthermore, the thickness of the fire-retardant paper can be adjusted according to actual needs, ranging from 0.1 mm to 1 mm.

[0016] Furthermore, the adhesive layer is organic silicone adhesive.

[0017] Furthermore, a release paper layer is provided at the bottom of the adhesive layer to protect the adhesive layer before use, and the release paper can be easily peeled off for pasting operation during use.

[0018] A method for manufacturing fire-retardant paper comprises the following steps:

[0019] Preparation of base paper layer:

[0020] Mixing traditional wood pulp fibers with 10%-30% hemp fibers or 3%-10% carbon fibers to form a base paper layer through a papermaking process, ensuring that the fibers are fully interwoven to enhance the physical properties of the base paper layer;

[0021] Flame retardant coating preparation:

[0022] Nano magnesium hydroxide as a flame retardant, polyurethane resin as a binder, and other additives including a dispersant and a thickener are mixed to form a flame retardant coating material;

[0023] Apply the flame retardant coating material evenly on the base paper layer by dipping, spraying or blade coating to form a flame retardant coating, and ensure that the coating thickness is within a suitable range;

[0024] Protective outer layer settings:

[0025] The polyimide film is used as a protective outer layer and covered on the outer layer of the flame retardant coating by heat pressing or gluing to protect the inner structural layer and provide waterproof and oil-proof properties;

[0026] Adhesive layer settings:

[0027] Apply organic silicone adhesive to the bottom of the base paper layer as a bonding layer, and ensure that its thickness is within an appropriate range;

[0028] Release paper layer added:

[0029] A release paper layer is arranged at the bottom of the adhesive layer to protect the adhesive layer before use, and the release paper can be easily peeled off for pasting operation during use.

[0030] Thickness adjustment:

[0031] According to actual needs, the overall thickness of the fire retardant paper is adjusted to a range between 0.1 mm and 1 mm.

[0032] (III) Beneficial effects

[0033] Compared with the prior art, the present invention provides a fire-retardant paper having the following beneficial effects:

[0034] The base paper layer of the invention has enhanced physical properties by mixing hemp fiber or carbon fiber in a specific proportion, can adapt to a variety of external force environments, the flame retardant coating contains nano magnesium hydroxide, etc., which effectively prevents the spread of fire, the polyimide film of the protective outer layer provides high temperature, wear and chemical corrosion protection, and extends the life of the paper, the organic silicone adhesive of the bonding layer ensures firm adhesion, the release paper layer is easy to use, the overall performance is comprehensively improved, and it is widely used.

[0035] The invention improves the raw materials, enhances the strength and flexibility, etc., and has a unique flame retardant coating and protective outer layer design, which greatly improves the fire prevention and protection capabilities. The thickness can be adjusted as needed to adapt to different scenes. The adhesive layer and the release paper layer enhance the convenience and stability of use. It can better meet the fire prevention needs in the fields of construction, electricity, and archive preservation, effectively reduce the risk of fire, and ensure the safety of personnel and property. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0037] Figure 2 It is a schematic diagram of the cross-sectional structure of the present invention;

[0038] Figure 3 It is a schematic diagram of the steps of the method of the present invention.

[0039] In the figure: 1. Base paper layer; 2. Flame retardant coating; 3. Protective outer layer; 4. Adhesive layer. DETAILED DESCRIPTION

[0040] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0041] Example

[0042] like Figure 1-2 As shown, a fire-proof and flame-retardant paper proposed in one embodiment of the present invention includes a base paper layer 1, which is a mixture of traditional wood pulp fibers and 10%-30% hemp fibers or 3%-10% carbon fibers, and the fibers are fully interwoven through a papermaking process.

[0043] The mixing of hemp fiber and carbon fiber enhances the physical properties of the base paper layer 1, such as strength and toughness, so that it can withstand a certain external force, provide a solid foundation for the entire fire-retardant paper, and ensure the relative stability of the structure under special circumstances such as use and fire.

[0044] The flame retardant coating 2 is composed of nano magnesium hydroxide as a flame retardant, polyurethane resin as a binder, and other additives such as a dispersant and a thickener, and is evenly applied to the base paper layer 1 by dipping, spraying or scraping, and the thickness is within a suitable range.

[0045] Nano magnesium hydroxide decomposes and absorbs heat when heated, lowering the surface temperature of the paper. The generated magnesium oxide forms a heat-insulating and oxygen-isolating protective film to prevent the spread of fire. The polyurethane resin binder allows the flame retardant to be firmly attached to the base paper layer 1, the dispersant ensures that the nano magnesium hydroxide is evenly dispersed, and the thickener adjusts the coating viscosity to facilitate the coating operation, together achieving efficient flame retardant function and ensuring coating stability.

[0046] The protective outer layer 3 is made of a polyimide film and is covered on the outer layer of the flame retardant coating 2 by heat pressing or gluing.

[0047] The polyimide film has excellent resistance to high temperature, wear and chemical corrosion, and can protect the internal flame retardant coating 2 and the base paper layer 1 from damage by external factors, such as preventing the flame retardant coating 2 from being worn or scratched off, while providing waterproof and oil-proof properties, thereby extending the service life and performance stability of the fire-retardant paper.

[0048] The adhesive layer 4 is made of organic silicone adhesive and is applied to the bottom of the base paper layer 1 with a suitable thickness. A release paper layer is arranged at the bottom.

[0049] The organic silicone adhesive is resistant to high temperatures and has good flexibility and chemical stability, providing strong bonding force, so that the fire-retardant paper can be firmly attached to the required surface. The release paper layer protects the adhesive layer 4 before use to prevent it from being contaminated or ineffective, and can be easily peeled off during use, facilitating the pasting operation and enhancing the convenience of using the fire-retardant paper.

[0050] like Figure 1 As shown, in some embodiments, the base paper layer 1 is made by mixing 10%-30% hemp fiber or 3%-10% carbon fiber into traditional wood pulp fiber;

[0051] Hemp fiber itself has high strength and toughness, and the hydrogen bonding between its cellulose molecular chains is strong, which makes the fiber have good mechanical properties. When 10%-30% of hemp fiber is mixed, the strength of the base paper layer 1 can be effectively enhanced. Within this content range, as the proportion of hemp fiber increases, the tensile strength of the paper gradually increases. For example, when the hemp fiber content is 10%, the tensile strength of the paper can be increased by about 15%-20% compared with pure wood pulp paper; when the content reaches 30%, the tensile strength can be increased by about 30%-40%.

[0052] Hemp fiber also has a certain hygroscopic property, which can adjust the humidity of the environment in which the paper is located to a certain extent, reducing the impact of humidity changes on the performance of the paper. However, too high a hemp fiber content may cause the flexibility of the paper to decrease, because hemp fiber is relatively coarse, which will affect the softness of the paper during the paper forming process. At the same time, too high a hemp fiber content may affect the surface flatness of the paper to a certain extent, which is not conducive to the uniform coating of the subsequent coating.

[0053] Carbon fiber has extremely high strength and modulus and is a high-performance fiber material. When mixed with 3%-10% carbon fiber, the strength and high temperature resistance of the base paper layer 1 can be significantly improved. Carbon fiber can play a role similar to a reinforced skeleton in the base paper layer 1. Even in a high temperature environment, it can maintain good structural integrity and prevent the paper from collapsing quickly in a fire. For example, in a high temperature test, the base paper layer 1 containing 3% carbon fiber can still maintain a certain shape at a high temperature of 300°C, while pure wood pulp paper has begun to carbonize and deform at the same temperature.

[0054] Carbon fiber has good chemical stability and is not easily corroded by chemical substances, which helps to improve the durability of the base paper layer 1 in complex environments. However, the price of carbon fiber is relatively high, and too high a mixing ratio will greatly increase the production cost. Moreover, it is relatively difficult to combine carbon fiber with wood pulp fiber and hemp fiber. If the mixing ratio is unreasonable or the mixing process is not good, carbon fiber agglomeration is likely to occur, affecting the uniformity of the paper and thus reducing the overall performance of the paper.

[0055] By mixing hemp fiber and carbon fiber into wood pulp fiber in a certain proportion to form the base paper layer 1, their synergistic reinforcement effect can be brought into play. The toughness and partial strength provided by the hemp fiber complement the high strength and high temperature resistance of the carbon fiber. In terms of strength, the combined effect of the two enables the base paper layer 1 to withstand greater external forces, whether it is stretched, torn or under the thermal stress of fire, it can maintain good structural stability.

[0056] Under different environmental conditions, the mixed fiber base paper layer 1 shows better adaptability. For example, in a high humidity environment, the hygroscopic properties of hemp fiber can balance the humidity of the paper, while the corrosion resistance of carbon fiber ensures that the paper will not be damaged by chemicals in the water; in a high temperature environment, the high temperature resistance of carbon fiber is dominant, ensuring that the paper can effectively prevent the spread of fire in the early stage of the fire, buying time for personnel evacuation and fire fighting, while hemp fiber can also maintain the structural integrity of the paper to a certain extent, preventing it from breaking too quickly. This mixed fiber design enables the base paper layer 1 to meet the needs of fire-retardant paper as a high-performance material under various performance requirements.

[0057] like Figure 2 As shown, in some embodiments, the flame retardant coating 2 is composed of a flame retardant, a binder and other additives, nano magnesium hydroxide is a flame retardant component, the binder is a polyurethane resin, and other additives include a dispersant and a thickener;

[0058] Nano magnesium hydroxide will decompose when heated: this decomposition process is an endothermic reaction that can absorb a large amount of heat, thereby reducing the temperature of the paper surface, slowing down the speed at which the paper reaches the ignition point, and effectively inhibiting the spread of flames. Each gram of nano magnesium hydroxide can absorb about 1.3kJ of heat during the decomposition process, which is of great significance for preventing the development of fire in the early stage of paper combustion;

[0059] The magnesium oxide produced by the decomposition reaction is a white solid that forms a dense protective film on the surface of the paper. This film has good heat insulation properties and can prevent heat from transferring into the interior of the paper, reducing the possibility of further thermal decomposition of the paper. At the same time, it can also isolate oxygen, causing insufficient oxygen supply for paper combustion, thereby inhibiting the continued combustion reaction. In actual tests, when paper containing nano-magnesium hydroxide flame retardant coating 2 is burning, the flame propagation speed is significantly lower than that of untreated paper, and the carbon layer structure after burning is more complete, indicating that the magnesium oxide protective film plays an effective role in heat insulation and oxygen isolation;

[0060] The polyurethane resin has excellent bonding ability and can firmly attach the nano magnesium hydroxide flame retardant to the surface of the base paper layer 1. It combines with paper fibers and flame retardant particles through chemical bonding, physical adsorption and other methods to form a stable overall structure. During the production process, even after coating, drying and other processes, the flame retardant will not easily fall off from the surface of the paper, ensuring the effectiveness of the flame retardant coating 2 during use. For example, in vibration and friction tests that simulate the use environment, the paper coated with the flame retardant coating 2 bonded with polyurethane resin has an extremely low shedding rate of flame retardant particles, ensuring that the flame retardant performance of the paper is long-lasting and stable;

[0061] The polyurethane resin itself has a certain degree of flexibility, which enables the flame retardant coating 2 to adapt to the deformation of paper in different environments. For example, when it is bent, folded, or squeezed by a certain external force, the coating will not crack or break. At the same time, it also has good weather resistance and can resist the influence of environmental factors such as ultraviolet rays, humidity, and temperature changes, and maintain good bonding performance and coating integrity for a long time. In the long-term outdoor exposure test, the flame retardant properties and coating appearance of the paper containing the polyurethane resin bonded flame retardant coating 2 did not change significantly over a long period of time, showing its good weather resistance;

[0062] Dispersants play a vital role in the flame retardant coating 2 system. Nanoparticles tend to agglomerate with each other due to their high surface energy, while dispersants can reduce the attraction between particles and allow nano magnesium hydroxide to be evenly dispersed in the coating solution. This ensures that during the coating process, the flame retardant can be evenly distributed on the surface of the paper to form a uniform flame retardant layer. If there is no dispersant or the dispersion effect is poor, the flame retardant content in some areas may be too high, while the content in other areas may be insufficient, affecting the overall flame retardant effect. For example, in the flame retardant coating 2 using a suitable dispersant, the nano magnesium hydroxide particles are evenly distributed at the microscopic level, while the coating without a dispersant has obvious particle agglomeration and unstable flame retardant properties;

[0063] Thickeners are used to adjust the viscosity of flame retardant coating 2 materials. Appropriate viscosity is crucial to the coating process. It enables the coating material to have good fluidity during the coating process, facilitating uniform coverage on the paper surface, while not being too thin to cause uneven coating thickness or flow. For example, in the dip coating process, a coating solution with appropriate viscosity can fully immerse the paper and form a coating of uniform thickness after removal; in the spraying process, appropriate viscosity can ensure the uniformity of the spray and the consistency of the particle size. The use of thickeners can be adjusted according to the specific coating method and process requirements to obtain the best coating effect.

[0064] like Figure 2 As shown, in some embodiments, the protective outer layer 3 is a polyimide film;

[0065] Polyimide film has excellent high temperature resistance. Its long-term use temperature can reach 200-300℃, and it can withstand higher temperatures in the short term. In fire-retardant paper, when a fire occurs, it can maintain a stable structure and performance in a high temperature environment, effectively preventing the internal flame retardant coating 2 and base paper layer 1 from being damaged by high temperature. For example, in a simulated fire high temperature test, the polyimide film can remain intact at a high temperature of 500℃ without decomposition, deformation or melting, providing a reliable high temperature protection barrier for the internal structure of the paper;

[0066] It has high tensile strength and good flexibility. The tensile strength is usually between 100-200MPa, which makes the protective outer layer 3 not easy to break or damage when subjected to external forces, such as friction, collision in daily use or air flow impact in fire. At the same time, its flexibility ensures that when the paper is bent, folded, etc., the film can be deformed without cracking, maintaining the protection of the internal structure. For example, in repeated folding tests, the fire-retardant paper covered with polyimide film had no obvious creases or damage on the surface of the film after multiple folds, and the internal structure was intact;

[0067] Polyimide film has good tolerance to most chemicals, including acids, alkalis, organic solvents, etc. In different chemical environments, such as detergents that may be exposed in building decoration, chemical gases that may exist around electrical equipment, etc., it can remain stable and not react chemically, thereby protecting the internal paper structure from chemical erosion. For example, after the fire-retardant paper coated with polyimide film is immersed in acid and alkali solutions for a period of time, the film has no obvious changes, and the flame-retardant coating 2 and base paper layer 1 inside the paper are not damaged.

[0068] like Figure 2 As shown, in some embodiments, the thickness of the fire-retardant paper can be adjusted according to actual needs, ranging from 0.1 mm to 1 mm;

[0069] In the construction industry, when used for wall decoration or ceiling materials, thicker fire retardant paper, such as 0.5-1 mm, may be required. Thicker paper can provide better coverage and certain sound insulation performance, and its strength can better withstand the operation during installation and external forces during use. For example, in the interior decoration of large commercial buildings, the use of thicker fire retardant paper can more effectively cover the wall, and in areas with frequent human activities, it can resist collision and friction, maintaining the integrity and fire resistance of the wall.

[0070] In the electrical industry, the thickness of electrical equipment packaging can be relatively thin, generally between 0.1-0.3 mm. Thinner paper can meet the requirements of fire retardancy without increasing the packaging volume and weight, making it easier to transport and install electrical equipment. For example, for the packaging of small electronic equipment, the use of thin fire retardant paper can provide the necessary fire protection without affecting the size and portability of the equipment.

[0071] In terms of archival document preservation, a thickness of 0.2-0.5 mm is more appropriate. This thickness can ensure that the paper has a certain strength to prevent the documents from being easily damaged during the preservation process, but it will not be too heavy to affect the organization and storage of the documents. For example, in the preservation of precious historical documents, fire-retardant paper needs to provide fire protection while not affecting the convenience of reading and storing the documents.

[0072] like Figure 2 As shown, in some embodiments, the adhesive layer 4 is an organic silicone adhesive;

[0073] Organic silicone adhesive has excellent high temperature resistance and can maintain stable performance over a wide temperature range. Generally speaking, it can be used normally in a temperature environment of -50°C to 200°C or even higher. In the application of fire-retardant paper, when encountering high temperature conditions such as fire, organic silicone adhesive will not quickly decompose or lose its viscosity due to high temperature, thereby ensuring the firmness of the bond between the paper and the object being adhered. For example, in a simulated fire high temperature test, after long-term high temperature exposure, the fire-retardant paper bonded by organic silicone adhesive is still firmly adhered to the test board without falling off or shifting, effectively ensuring the protective function of the paper in a fire scenario;

[0074] It has good flexibility and elasticity, which enables the adhesive layer 4 to adapt to the microscopic unevenness of the surfaces of different materials and the stress changes that may occur during use. When the object being adhered is slightly deformed or vibrated, the organic silicone adhesive can absorb the stress through its own elastic deformation without causing cracking or debonding at the bonding point. For example, in architectural decoration, the wall or ceiling may undergo slight deformation due to temperature changes, building settlement, etc. The fire-retardant paper bonded with organic silicone adhesive can expand and contract moderately with these deformations, maintaining a close fit with the wall or ceiling without affecting its fireproof performance;

[0075] Organic silicone adhesive has good tolerance to a variety of chemical substances, including common acids, alkalis, salt solutions, and organic solvents. In different use environments, such as in industrial plants where chemical gas pollution may exist, or in outdoor environments where acid rain may corrode, it can maintain stable chemical properties and not react with surrounding chemical substances, thereby ensuring the long-term effectiveness of the adhesive layer 4. For example, after the fire-retardant paper sample bonded by organic silicone adhesive is immersed in an acid-base solution for a period of time, it is taken out and its bonding strength is tested. It is found that compared with the unimmersed sample, the bonding strength has not decreased significantly, indicating that it has good chemical stability.

[0076] like Figure 2 As shown, in some embodiments, a release paper layer is provided at the bottom of the adhesive layer 4, which is convenient for protecting the adhesive layer 4 before use, and the release paper can be easily peeled off for pasting operation during use; during the storage and transportation of the fire-retardant paper, the release paper layer plays a key protective role. It can prevent the adhesive layer 4 from contacting with dust, oil, moisture and other impurities in the external environment. If the adhesive layer 4 is contaminated, it may affect its viscosity, resulting in failure to firmly adhere to the target surface during pasting, thereby affecting the overall performance of the fire-retardant paper. For example, in a warehouse storage environment, if there is no protection of the release paper layer, dust may adhere to the adhesive layer 4. When the fire-retardant paper is pasted to a wall or other surface, the dust will be mixed between the adhesive layer 4 and the pasted surface, reducing the bonding force, and may even cause local loose pasting, affecting the fireproof effect.

[0077] The effect of moisture on the adhesive layer 4 is particularly serious. It may cause the organic silicone adhesive to undergo hydrolysis reaction, reducing its chemical stability and viscosity. The presence of the release paper layer can effectively block moisture and ensure that the adhesive layer 4 maintains a good performance state before use. For example, if the fire-retardant paper is stored in a high humidity environment, the viscosity of its adhesive layer 4 will not decrease significantly within a certain period of time if it is protected by a release paper layer; while the unprotected adhesive layer 4 may become soft and less viscous due to moisture absorption, and cannot be used normally.

[0078] like Figure 3 , a method for manufacturing fire-retardant paper, comprising the following steps:

[0079] Preparation of base paper layer 1:

[0080] The conventional wood pulp fibers are mixed with 10%-30% of hemp fibers or 3%-10% of carbon fibers, and the base paper layer 1 is made by a papermaking process, and the fibers are ensured to be fully interwoven to enhance the physical properties of the base paper layer 1;

[0081] Preparation of flame retardant coating 2:

[0082] Nano magnesium hydroxide as a flame retardant, polyurethane resin as a binder, and other additives including a dispersant and a thickener are mixed to form a flame retardant coating 2 material;

[0083] The flame retardant coating 2 material is uniformly applied on the base paper layer 1 by dipping, spraying or blade coating to form the flame retardant coating 2, and the coating thickness is ensured to be within a suitable range;

[0084] Protective outer layer 3 settings:

[0085] The polyimide film is used as the protective outer layer 3 and is covered on the outer layer of the flame retardant coating 2 by heat pressing or gluing to protect the inner structural layer and provide waterproof and oil-proof properties;

[0086] Adhesive layer 4 settings:

[0087] Apply organic silicone adhesive as the bonding layer 4 on the bottom of the base paper layer 1, and ensure that its thickness is within a suitable range;

[0088] Release paper layer added:

[0089] A release paper layer is disposed at the bottom of the adhesive layer 4 to protect the adhesive layer 4 before use. When in use, the release paper can be easily peeled off for pasting operation.

[0090] Thickness adjustment:

[0091] According to actual needs, the overall thickness of the fire retardant paper is adjusted to a range between 0.1 mm and 1 mm;

[0092] The performance comparison is shown in the following table:

[0093]

[0094] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A fire-retardant paper, comprising a base paper layer (1), characterized in that: The base paper layer (1) is the basic structural layer of the fireproof and flame-retardant paper, and a high-strength fiber raw material is used to enhance the physical properties of the base paper layer. A flame-retardant coating (2) is arranged on the base paper layer (1), and a protective outer layer (3) is arranged on the outer layer of the flame-retardant coating (2). An adhesive layer (4) is arranged at the bottom of the base paper layer (1).

2. The fire-retardant paper according to claim 1, characterized in that: The base paper layer (1) is prepared by mixing 10%-30% of hemp fiber or 3%-10% of carbon fiber into conventional wood pulp fiber.

3. The fire-retardant paper according to claim 1, characterized in that: The flame retardant coating (2) is composed of a flame retardant, a binder and other additives, wherein the nano magnesium hydroxide is a flame retardant component, the binder is a polyurethane resin, and the other additives include a dispersant and a thickener.

4. The fire-retardant paper according to claim 1, characterized in that: The protective outer layer (3) is a polyimide film.

5. The fireproof and flame-retardant paper according to claim 1, characterized in that: The thickness of the fire-retardant paper can be adjusted according to actual needs, ranging from 0.1 mm to 1 mm.

6. The fire-retardant paper according to claim 1, characterized in that: The adhesive layer (4) is an organic silicone adhesive.

7. The fire-retardant paper according to claim 6, characterized in that: A release paper layer is provided at the bottom of the adhesive layer (4) to protect the adhesive layer before use. When in use, the release paper can be easily peeled off for pasting operations.

8. A method for producing fire-retardant paper, characterized in that: The following steps are involved: Preparation of base paper layer (1): Traditional wood pulp fibers are mixed with 10%-30% hemp fibers or 3%-10% carbon fibers, and a base paper layer (1) is prepared by a papermaking process, ensuring that the fibers are fully interwoven to enhance the physical properties of the base paper layer (1); Preparation of flame retardant coating (2): Mixing nano magnesium hydroxide as a flame retardant, polyurethane resin as a binder, and other additives including a dispersant and a thickener to form a flame retardant coating (2) material; Applying the flame retardant coating (2) material uniformly on the base paper layer (1) by dipping, spraying or blade coating to form the flame retardant coating (2), and ensuring that the coating thickness is within a suitable range; The protective outer layer (3) is provided with: A polyimide film is used as a protective outer layer (3) and is covered on the outer layer of the flame retardant coating (2) by heat pressing or gluing to protect the inner structural layer and provide waterproof and oil-proof properties; Adhesive layer (4) is provided: Applying organic silicone adhesive as an adhesive layer (4) on the bottom of the base paper layer (1), and ensuring that the thickness thereof is within a suitable range; Release paper layer added: A release paper layer is arranged at the bottom of the adhesive layer (4) to protect the adhesive layer before use; during use, the release paper can be easily peeled off for pasting operation. Thickness adjustment: According to actual needs, the overall thickness of the fire retardant paper is adjusted to a range between 0.1 mm and 1 mm.

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