Composite fiber paper and preparation method and application thereof

Abstract

This invention provides a composite fiber paper, comprising, by weight fraction of raw materials, 150-300 parts by weight of ceramic fiber, 150-300 parts by weight of chopped glass wool, 0.5-2 parts by weight of dispersant, 25-60 parts by weight of filler, 800-1200 parts by weight of latex, and water. This invention uses ceramic fiber and chopped glass wool as the matrix, with a simple process and is environmentally friendly and pollution-free. The product's thermal conductivity meets the Class B standard for aerogel composite products, exhibiting excellent thermal insulation performance and superior mechanical properties. It can be applied in flat laying, winding, and other methods to meet the thermal insulation requirements of various working conditions. Furthermore, the preparation method is simple, with mild and easily controllable conditions, is environmentally friendly and pollution-free, and is conducive to continuous industrial production.

Description

Technical Field

[0001] This invention belongs to the technical field of thermal insulation composite fiber paper materials, and relates to a composite fiber paper, its preparation method, and its application. Background Technology

[0002] Currently, in response to the national call for energy conservation and carbon reduction, industries such as petrochemicals, metallurgy, and building materials require all units to adhere to the principles of energy conservation and emission reduction during project construction, improve the thermal efficiency of the units, and reduce heat loss. This has led to a continuous increase in demand for energy-saving materials across various industries, and a greater desire for more advanced energy-saving products.

[0003] Currently, commonly used thermal insulation structures are mostly composed of aerogel products and ceramic fiber products. As is well known, aerogel and its products are the best thermal insulation materials in the world. Aerogel products have extremely low thermal conductivity. However, in actual construction and use, aerogel products have poor flexural strength, are difficult to cut, and have serious powdery material shedding, which affects the overall thermal insulation effect. Especially when covering devices resembling pipes, their inflexibility seriously affects the thermal insulation effect.

[0004] Therefore, how to develop a product that has better thermal insulation performance than traditional insulation materials, has a thermal insulation effect comparable to aerogel products, and can be rolled up for various application environments has become one of the focuses of attention for many R&D companies and front-line researchers in the industry. Summary of the Invention

[0005] In view of this, the technical problem to be solved by the present invention is to provide a composite fiber paper, its preparation method, and its application. The composite fiber paper prepared by the present invention has a thermal conductivity that meets the Class B standard for aerogel composite products, and exhibits excellent thermal insulation performance. Moreover, the preparation method is simple, with mild and easily controllable conditions, which is conducive to realizing continuous industrial production.

[0006] This invention discloses a composite fiber paper, comprising, by weight fraction of raw materials:

[0007] 150-300 parts by weight of ceramic fiber;

[0008] 150-300 parts by weight of chopped glass wool;

[0009] Dispersant 0.5–2 parts by weight;

[0010] 25-60 parts by weight of filler;

[0011] 800-1200 parts by weight of latex;

[0012] water.

[0013] Preferably, the ceramic fiber includes one of standard ceramic fiber, high-purity ceramic fiber, high-alumina ceramic fiber, and zirconium-containing ceramic fiber;

[0014] The chopped glass wool has a fiber length of 10–50 mm;

[0015] The chopped glass wool includes chopped glass wool of a single fiber length or a combination of chopped glass wool of multiple fiber lengths.

[0016] Preferably, the dispersant includes a papermaking wet strength agent;

[0017] The filler comprises solid powder.

[0018] Preferably, the particle size of the filler is 2000-10000 mesh;

[0019] The filler includes silicon carbide micro powder and / or titanium dioxide micro powder;

[0020] The papermaking wet strength agent includes polyethyleneimine.

[0021] Preferably, the latex comprises an acrylic emulsion;

[0022] The latex has a mass concentration of 1% to 5%.

[0023] Preferably, the thickness of the composite fiber paper is 1 to 15 mm;

[0024] The thermal conductivity of the composite fiber paper at an average temperature of 300℃ is (0.037~0.043) W / (m·k);

[0025] The tensile strength of the composite fiber paper is 0.60 to 0.90 MPa.

[0026] This invention provides a method for preparing composite fiber paper as described in any one of the above technical solutions, comprising the following steps:

[0027] 1) Ceramic fibers, chopped glass wool, dispersant and water are pulped to obtain a slurry;

[0028] 2) Mix the slurry, filler, and water obtained in the above steps to obtain the slurry;

[0029] 3) After the pulp obtained in the above steps is formed by vacuum wire forming, the resulting wet blank is sprayed with latex and dried to obtain composite fiber paper.

[0030] Preferably, in step 1), the mass ratio of water added to chopped glass wool is (20-30):1;

[0031] The pulping speed is 1000-2000 r / min;

[0032] In step (2), the ratio of water added to chopped glass wool is (200-300):1.

[0033] Preferably, the mixing speed is 500–1500 r / min;

[0034] The drying temperature is 100–150°C;

[0035] The drying time is 30 to 100 minutes.

[0036] The present invention also provides the application of the composite fiber paper described in any one of the above technical solutions or the composite fiber paper prepared by the preparation method described in any one of the above technical solutions in the field of thermal insulation materials.

[0037] This invention provides a composite fiber paper, comprising, by weight fraction of raw materials, 150-300 parts by weight of ceramic fiber, 150-300 parts by weight of chopped glass wool, 0.5-2 parts by weight of dispersant, 25-60 parts by weight of filler, 800-1200 parts by weight of latex, and water. Compared with existing technologies, this invention provides a composite fiber paper with a specific structure and composition, using ceramic fiber and chopped glass wool as the matrix. The process is simple, environmentally friendly, and pollution-free. The product's thermal conductivity meets the Class B standard for aerogel composite products, exhibiting excellent thermal insulation performance and superior mechanical properties. It can be applied in flat laying, winding, and other methods to meet the thermal insulation requirements of various working conditions. Furthermore, the preparation method is simple, with mild and easily controllable conditions, is environmentally friendly and pollution-free, and is conducive to continuous industrial production.

[0038] Experimental results show that the composite fiber paper prepared by this invention has the following technical specifications: thickness: 1-15 mm; tensile strength: ≥0.60 MPa; thermal conductivity (average 300℃) ≤0.043 W / (m·k). Detailed Implementation

[0039] To further understand the present invention, preferred embodiments of the present invention are described below in conjunction with examples. However, it should be understood that these descriptions are only for further illustrating the features and advantages of the present invention, and not for limiting the scope of the claims.

[0040] There are no particular restrictions on the source of any raw materials used in this invention; they can be purchased from the market or prepared using conventional methods known to those skilled in the art.

[0041] There are no particular restrictions on the purity of any of the raw materials used in this invention. However, this invention preferably uses industrial-grade pure materials or materials with the purity requirements commonly used in the field of composite fiber paper preparation.

[0042] All raw materials of this invention are conventional in the field, and each brand name and abbreviation is clear and distinct in its relevant application. Those skilled in the art can purchase them from the market or prepare them by conventional methods based on the brand name, abbreviation and corresponding application.

[0043] This invention provides a composite fiber paper, comprising, by mass fraction of raw materials:

[0044] 150-300 parts by weight of ceramic fiber;

[0045] 150-300 parts by weight of chopped glass wool;

[0046] Dispersant 0.5–2 parts by weight;

[0047] 25-60 parts by weight of filler;

[0048] 800-1200 parts by weight of latex;

[0049] water.

[0050] In this invention, the amount of ceramic fiber added is 150-300 parts by weight, or 180-260 parts by weight, or 210-230 parts by weight.

[0051] In this invention, the amount of chopped glass wool added is 150-300 parts by weight, or 180-260 parts by weight, or 210-230 parts by weight.

[0052] In this invention, the amount of the dispersant added is 0.5 to 2 parts by weight, which can be 0.8 to 1.7 parts by weight, or 1.1 to 1.4 parts by weight.

[0053] In this invention, the amount of filler added is 25 to 60 parts by weight, or 30 to 55 parts by weight, or 35 to 50 parts by weight, or 40 to 45 parts by weight.

[0054] In this invention, the amount of latex added is 800-1200 parts by weight, or 880-1120 parts by weight, or 960-1400 parts by weight.

[0055] In this invention, the ceramic fiber preferably includes one of standard ceramic fiber, high-purity ceramic fiber, high-alumina ceramic fiber and zirconium-containing ceramic fiber, and more preferably standard ceramic fiber, high-purity ceramic fiber, high-alumina ceramic fiber or zirconium-containing ceramic fiber.

[0056] In this invention, the fiber length of the chopped glass wool is preferably 10-50 mm, more preferably 18-42 mm, and even more preferably 26-34 mm.

[0057] In this invention, the chopped glass wool preferably includes chopped glass wool of a single fiber length or a combination of chopped glass wool of multiple fiber lengths.

[0058] In this invention, the dispersant preferably includes a papermaking wet strength agent. Specifically, the papermaking wet strength agent preferably includes polyethyleneimine. This invention specifically selects a papermaking wet strength agent as a dispersant, which, during the preparation of papermaking pulp, can improve the uniform dispersion of chopped glass wool, and then, after the pulp is formed, can act as a wet strength agent to improve the wet strength of the glass wool paper.

[0059] In this invention, the filler preferably comprises solid powder.

[0060] In this invention, the particle size of the filler is preferably 2000-10000 mesh, more preferably 3500-8500 mesh, and even more preferably 5000-7000 mesh.

[0061] In this invention, the filler preferably includes silicon carbide micro powder and / or titanium dioxide micro powder, more preferably silicon carbide micro powder or titanium dioxide micro powder.

[0062] In this invention, the latex preferably comprises an acrylic emulsion.

[0063] In this invention, the mass concentration of the latex is preferably 1% to 5%, more preferably 1.5% to 4.5%, more preferably 2% to 4%, and even more preferably 2.5% to 3.5%.

[0064] In this invention, the thickness of the composite fiber paper is preferably 1-15 mm, more preferably 4-12 mm, and even more preferably 7-9 mm.

[0065] In this invention, the thermal conductivity of the composite fiber paper at an average temperature of 300°C is preferably (0.037~0.043) W / (m·k), more preferably (0.038~0.042) W / (m·k), and even more preferably (0.039~0.041) W / (m·k).

[0066] In this invention, the tensile strength of the composite fiber paper is preferably 0.60-0.90 MPa, more preferably 0.65-0.85 MPa, and even more preferably 0.7-0.8 MPa.

[0067] This invention provides a method for preparing composite fiber paper as described in any one of the above technical solutions, comprising the following steps:

[0068] 1) Ceramic fibers, chopped glass wool, dispersant and water are pulped to obtain a slurry;

[0069] 2) Mix the slurry, filler, and water obtained in the above steps to obtain the slurry;

[0070] 3) After the pulp obtained in the above steps is formed by vacuum wire forming, the resulting wet blank is sprayed with latex and dried to obtain composite fiber paper.

[0071] The present invention first involves pulping ceramic fibers, chopped glass wool, dispersant and water to obtain a slurry.

[0072] In this invention, in step 1), the preferred ratio of water added to chopped glass wool is (20-30):1, more preferably (22-28):1, and even more preferably (24-26):1.

[0073] In this invention, the pulping speed is preferably 1000-2000 r / min, more preferably 1200-1800 r / min, and even more preferably 1400-1600 r / min.

[0074] The present invention further mixes the slurry, filler and water obtained in the above steps to obtain a slurry.

[0075] In this invention, in step (2), the ratio of water added to chopped glass wool is preferably (200-300):1, more preferably (220-280):1, and even more preferably (240-260):1.

[0076] In this invention, the mixing speed is preferably 500-1500 r / min, more preferably 700-1300 r / min, and even more preferably 900-1100 r / min.

[0077] Finally, the slurry obtained in the above steps is vacuum wire-forming, and the resulting wet blank is sprayed with latex and dried to obtain composite fiber paper.

[0078] In this invention, the drying temperature is preferably 100-150°C, more preferably 110-140°C, and even more preferably 120-130°C.

[0079] In this invention, the drying time is preferably 30 to 100 minutes, more preferably 45 to 85 minutes, and even more preferably 60 to 70 minutes.

[0080] This invention aims to complete and refine the overall technical solution, thereby improving the thermal insulation and overall mechanical properties of composite fiber paper. Specifically, the aforementioned composite fiber paper and its preparation method may include the following:

[0081] The composite fiber paper provided by this invention mainly consists of ceramic fibers, chopped glass wool, dispersant, filler, and latex. Its preparation method employs a wet process, firstly, the ceramic fibers and chopped glass wool are pulped and dispersed, then pumped into a pulp mixing tank for pulping, followed by long-wire vacuum forming, glue application, drying, cutting, winding, and packaging to obtain the final product.

[0082] The specific technical solution adopted in this invention has the following steps:

[0083] (1) Add ceramic fiber and chopped glass wool to the pulping machine, add dispersant and water for pulping, and pump into the mixing tank after pulping is completed.

[0084] (2) Add filler to the slurry mixing tank, stir evenly, and then add water to dilute the slurry.

[0085] (3) After pumping the slurry from step (2) to the high-level tank, the slurry is discharged into the long-net vacuum forming system for forming. After vacuum filtration and dewatering, it enters the latex coating device for latex coating. After the latex coating is completed, it enters the drying system for drying.

[0086] (4) After drying, composite ceramic fiber paper is obtained by cutting, rolling and packaging.

[0087] The composite fiber paper provided by this invention is prepared from the following components:

[0088] 150-300 parts by weight of ceramic fiber

[0089] 150-300 parts by weight of chopped glass wool

[0090] 1-3 parts by weight of dispersant

[0091] 25-60 parts by weight of packing

[0092] 800-1200 parts by weight of latex.

[0093] Specifically, the ceramic fiber in step (1) is one of the following: standard ceramic fiber, high-purity ceramic fiber, high-alumina ceramic fiber, or zirconium-containing ceramic fiber.

[0094] Specifically, in step (1), the chopped glass wool has a fiber length of 10 to 50 mm, including any combination of different lengths within this range.

[0095] Specifically, the dispersant in step (1) is a papermaking wet strength agent.

[0096] Specifically, in step (1), the ratio of water added to chopped glass wool is 20 to 30:1.

[0097] Specifically, the filler in step (2) is a 2000-10000 mesh solid powder.

[0098] Specifically, the filler in step (2) is one or more of silicon carbide micro powder and titanium dioxide micro powder.

[0099] Specifically, in step (2), the ratio of water added to chopped glass wool is 200-300:1.

[0100] Specifically, in step (3), the latex is an acrylic emulsion with a weight concentration of 3%.

[0101] Specifically, the drying temperature in step (3) is 100-150℃.

[0102] The technical specifications of the composite fiber paper prepared by this invention are as follows:

[0103] Thickness: 1~15mm; Tensile strength: ≥0.60MPa; Thermal conductivity (average 300℃) ≤0.043W / (m·k).

[0104] The present invention also provides the application of the composite fiber paper described in any one of the above technical solutions or the composite fiber paper prepared by the preparation method described in any one of the above technical solutions in the field of thermal insulation materials.

[0105] The present invention provides a composite fiber paper, its preparation method, and its applications. The composite fiber paper with a specific structure and composition provided by the present invention uses ceramic fibers and chopped glass wool as the matrix, and the process is simple, environmentally friendly, and pollution-free. The product's thermal conductivity meets the Class B standard for aerogel composite products, exhibiting excellent thermal insulation performance and superior mechanical properties. It can be applied in flat laying, rolling, and other methods to meet the thermal insulation requirements of various working conditions. Furthermore, the preparation method is simple, with mild and easily controllable conditions, is environmentally friendly and pollution-free, and is conducive to continuous industrial production.

[0106] Experimental results show that the composite fiber paper prepared by this invention has the following technical specifications: thickness: 1-15 mm; tensile strength: ≥0.60 MPa; thermal conductivity (average 300℃) ≤0.043 W / (m·k).

[0107] To further illustrate the present invention, the following detailed description of a composite fiber paper, its preparation method, and its application is provided in conjunction with embodiments. However, it should be understood that these embodiments are implemented under the premise of the technical solution of the present invention, and detailed implementation methods and specific operating procedures are given only to further illustrate the features and advantages of the present invention, and are not intended to limit the scope of the claims of the present invention. The scope of protection of the present invention is not limited to the following embodiments.

[0108] Example 1

[0109] (1) Add 200kg of standard ceramic fiber and 200kg of chopped glass wool to the pulper, add 1kg of papermaking wet strength agent (polyethyleneimine) and 4000kg of water for pulping. After pulping, pump the pulp into the mixing tank.

[0110] (2) Add 32kg of silicon carbide micro powder to the slurry mixing tank, stir evenly, and then add 40,000kg of water to dilute the slurry.

[0111] (3) After pumping the slurry from step (2) to the high-level tank, the slurry is discharged into the long-net vacuum forming system for forming. After vacuum filtration and dehydration, the wet blank enters the coating device to coat with 800 kg of acrylic emulsion. After coating is completed, it enters the drying system for drying at a temperature of 120°C.

[0112] (4) After drying, composite ceramic fiber paper is obtained by cutting, rolling and packaging.

[0113] The resulting composite ceramic fiber paper has a thickness of 4 mm, a tensile strength of 0.75 MPa, and a thermal conductivity (average 300℃) of 0.041 W / (m·k).

[0114] Example 2

[0115] (1) Add 200kg of high-alumina ceramic fiber and 260kg of chopped glass wool to the pulper, add 3kg of papermaking wet strength agent (polyethyleneimine) and 6000kg of water for pulping. After pulping, pump the pulp into the mixing tank.

[0116] (2) Add 60 kg of titanium dioxide powder to the slurry mixing tank, stir evenly, and then add 60,000 kg of water to dilute the slurry.

[0117] (3) After pumping the slurry from step (2) to the high-level tank, the slurry is discharged into the long-net vacuum forming system for forming. After vacuum filtration and dehydration, the wet blank enters the coating device to coat with 1000kg of acrylic emulsion. After coating is completed, it enters the drying system for drying at a temperature of 130℃.

[0118] (4) After drying, the low thermal conductivity glass wool paper is obtained by cutting, rolling and packaging.

[0119] The obtained low thermal conductivity glass wool paper has a thickness of 15 mm, a tensile strength of 0.62 MPa, and a thermal conductivity (average 300℃) of 0.042 W / (m·k).

[0120] The foregoing has provided a detailed description of the composite fiber paper, its preparation method, and its applications. Specific examples have been used to illustrate the principles and implementation methods of the invention. The descriptions of these embodiments are merely for the purpose of helping to understand the method and core ideas of the invention, including the best mode, and also to enable any person skilled in the art to practice the invention, including manufacturing and using any device or system, and implementing any combined method. It should be noted that those skilled in the art can make various improvements and modifications to the invention without departing from its principles, and these improvements and modifications also fall within the scope of protection of the claims. The scope of protection of this patent is defined by the claims and may include other embodiments that can be conceived by those skilled in the art. If these other embodiments have structural elements that are not different from the wording of the claims, or if they include equivalent structural elements that are not substantially different from the wording of the claims, then these other embodiments should also be included within the scope of the claims.

Claims

1. The application of thermal insulation composite fiber paper in the field of thermal insulation materials, characterized in that, The thermal insulation composite fiber paper, by weight of raw materials, is composed of the following components: 150-300 parts by weight of ceramic fiber; 150-300 parts by weight of chopped glass wool; Dispersant 0.5~2 parts by weight; 25-60 parts by weight of filler; 800-1200 parts by weight of latex; water; The ceramic fiber is one of the following: standard ceramic fiber, high-purity ceramic fiber, high-alumina ceramic fiber, and zirconium-containing ceramic fiber; The chopped glass wool has a fiber length of 10~50mm; The chopped glass wool includes chopped glass wool of a single fiber length or a combination of chopped glass wool of multiple fiber lengths; The dispersant is polyethyleneimine; The filler is silicon carbide micro powder and / or titanium dioxide micro powder; The latex is an acrylic emulsion; The thermal insulation composite fiber paper has a thermal conductivity of 0.037~0.043 W / (m·k) at an average temperature of 300℃. The thickness of the thermal insulation composite fiber paper is 1~15mm; The preparation method of the thermal insulation composite fiber paper includes the following steps: 1) Ceramic fibers, chopped glass wool, dispersant and water are pulped to obtain a slurry; 2) After mixing the slurry, filler, and water obtained in the above steps, a slurry is obtained; 3) After the slurry obtained in the above steps is formed by vacuum wire forming, the resulting wet blank is sprayed with latex and dried to obtain thermal insulation composite fiber paper.

2. The application according to claim 1, characterized in that, The particle size of the filler is 2000~10000 mesh.

3. The application according to claim 1, characterized in that, The mass concentration of the latex is 1% to 5%.

4. The application according to claim 1, characterized in that, The tensile strength of the thermal insulation composite fiber paper is 0.60~0.90MPa.

5. The application according to claim 1, characterized in that, In step 1), the ratio of water added to the mass of chopped glass wool is (20~30):

1.

6. The application according to claim 1, characterized in that, The pulping speed is 1000~2000 r / min.

7. The application according to claim 1, characterized in that, In step (2), the ratio of water added to chopped glass wool is (200~300):

1.

8. The application according to claim 1, characterized in that, The mixing speed is 500~1500 r / min.

9. The application according to claim 1, characterized in that, The drying temperature is 100~150℃.

10. The application according to claim 1, characterized in that, The drying time is 30-100 minutes.