A functional paper-faced gypsum board made from waste felt carbon fiber

Abstract

The present invention relates to the field of functional utilization of waste felt carbon fibers, and specifically to a functional gypsum board prepared by using waste felt carbon fibers, which is used to solve the problems that the existing waste felt carbon fibers are difficult to recycle and recycle, and the existing gypsum boards are prone to cracking, have poor electrical conductivity, and have poor performance in resisting electromagnetic pollution. In the present invention, nano-TiO2 is used to modify waste felt carbon fibers to obtain modified waste felt carbon fibers, and then the modified waste felt carbon fibers are added to the functional gypsum board, so that the obtained functional gypsum board has high mechanical strength and greatly improved crack resistance, and also makes the surface of the functional gypsum board have good electrical conductivity. Finally, a new type of gypsum board with functions such as crack resistance, electrical conductivity, and radiation protection is obtained, which not only realizes the high-value resource utilization of waste felt carbon fibers, but also obtains a multifunctional gypsum board, with significant economic and environmental benefits and broad application prospects.

Description

Technical Field

[0001] The invention relates to the field of functional utilization of waste felt carbon fibers, and in particular to a functional paper-faced gypsum board prepared by utilizing waste felt carbon fibers. Background Art

[0002] At present, industrial manufacturing has increasingly stringent requirements for thermal insulation. How to effectively isolate high temperatures and avoid energy loss has become a key issue for the high-quality development of industry. Carbon fiber felt is an excellent thermal insulation material with the characteristics of light weight, low thermal conductivity, and good durability. It is widely used in thermal insulation of high-temperature kilns and furnaces, and has become a key material to ensure the normal operation of high-temperature environments. However, after multiple cycles of carbon fiber felt, its performance will gradually deteriorate, forming waste carbon fiber felt. Considering that the main component of waste carbon fiber felt is precious carbon fiber material, and carbon fiber has the characteristics of good conductivity, light weight, and high strength, it is of great economic and social significance to recycle waste carbon fiber felt to prepare functional materials. However, due to the fact that the surface of the waste felt carbon fiber is coated with a layer of resin, it is difficult to recycle it, and there are few existing utilization methods.

[0003] Gypsum board is a commonly used material for building partitions. It is used to manufacture structures such as partitions, ceilings and partition walls. It is easy to install, light in weight, has good sound insulation, excellent fire resistance, and has good moisture resistance, making it suitable for humid environments such as kitchens and bathrooms. However, gypsum board is prone to cracking, has a large loss of strength, and has poor durability. Moreover, due to the poor conductivity of gypsum board, static electricity is easily formed on the surface of the gypsum board, causing safety hazards. In addition, due to the large number of household appliances, buildings often face the problem of electromagnetic pollution indoors, which affects human health.

[0004] How to comprehensively utilize waste felt carbon fibers and significantly improve the crack resistance, conductivity and radiation protection performance of gypsum board is the key to the present invention. Therefore, it is necessary to use waste carbon fiber felt to prepare highly conductive and crack-resistant functional gypsum board to promote the development and application of functional building materials. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems, the purpose of the present invention is to provide a functional paper-faced gypsum board prepared using waste felt carbon fibers: gypsum clinker, water, a coagulant, modified waste felt carbon fibers, a foaming agent, ethyl cellulose and polyvinyl alcohol are added to a mortar mixer, and the materials are evenly stirred using the mortar mixer to obtain a slurry, and then the slurry is injected into a mold, and face paper is adhered to the upper and lower surfaces to form a board test block, and the board test block is demolded after solidification, and then cured to obtain the functional paper-faced gypsum board prepared using waste felt carbon fibers, which solves the problems that the existing waste felt carbon fibers are difficult to recycle and recycle, and the existing gypsum boards are prone to cracking, have poor conductivity and poor resistance to electromagnetic pollution.

[0006] The purpose of the present invention can be achieved through the following technical solutions:

[0007] A functional paper-faced gypsum board prepared by using waste felt carbon fibers, comprising a gypsum board core and facing paper attached to the upper and lower sides of the gypsum board core;

[0008] The gypsum board core comprises the following components in parts by weight:

[0009] 90-110 parts of gypsum clinker, 60-80 parts of water, 0.1-2 parts of accelerator, 5-10 parts of modified waste felt carbon fiber, 1-3 parts of foaming agent, 1-3 parts of ethyl cellulose, 1-2 parts of polyvinyl alcohol;

[0010] Wherein, the modified waste felt carbon fiber is prepared by the following steps:

[0011] Step S1: preparing a nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing the mixture at a temperature of 95-100°C and a stirring rate of 500-600 r / min for 2-3 hours to obtain a nano-TiO2 solution;

[0012] Step S2: preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, dry it, and place it in a nano-TiO2 solution, then stir and disperse it at a temperature of 25-30°C and a stirring rate of 500-600r / min for 4-5h, then let it stand for 1-2h, and then vacuum filter it to obtain a composite waste felt carbon fiber;

[0013] Step S3: preparing modified waste felt carbon fibers: drying the composite waste felt carbon fibers at high temperature to obtain modified waste felt carbon fibers.

[0014] As a further solution of the present invention: the water absorption of the inner side of the face paper is 26-30g / m 2 .

[0015] As a further solution of the present invention: the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, wherein the phosphogypsum and desulfurized gypsum are both industrial by-product gypsums, which are obtained by calcining at 150-190°C for 2h.

[0016] As a further solution of the present invention: the coagulant is one or a mixture of ammonium sulfate and calcium chloride in any proportion.

[0017] As a further solution of the present invention: the foaming agent is one of aluminum powder and peroxide or a mixture of the two in any proportion, and the peroxide is lithium peroxide.

[0018] As a further solution of the present invention: the mass ratio of the nano-TiO2 powder to clean water in step S1 is 5-100:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 5-30nm.

[0019] As a further solution of the present invention: the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution in step S2 is 30-60:100, wherein the waste felt carbon fiber is fiber filaments taken from waste felt, and the length of the waste felt carbon fiber is 3-21 mm.

[0020] As a further solution of the present invention: the high-temperature drying temperature range of the waste felt carbon fiber in step S3 is 140-160°C.

[0021] As a further solution of the present invention: the functional paper-faced gypsum board prepared by using waste felt carbon fiber is prepared by the following steps:

[0022] Step 1: Weigh 90-110 parts of gypsum clinker, 60-80 parts of water, 0.1-2 parts of accelerator, 5-10 parts of modified waste felt carbon fiber, 1-3 parts of foaming agent, 1-3 parts of ethyl cellulose, and 1-2 parts of polyvinyl alcohol according to weight parts, and set aside;

[0023] Step 2: Add gypsum clinker, water, accelerator, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, use the mortar mixer to mix the materials evenly to obtain a slurry, and then inject the slurry into a mold, adhere facing paper on the upper and lower surfaces to form a board test block, and demold the board test block after it solidifies, and then cure it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0024] Beneficial effects of the present invention:

[0025] The present invention discloses a functional gypsum board prepared by waste felt carbon fiber, wherein the surface of the waste felt carbon fiber is wrapped with a layer of resin, resulting in the loss of its surface function, and only good electrical conductivity still exists in the longitudinal direction. Therefore, in the preparation process of the functional gypsum board in the present invention, nano-TiO2 solution is first used to treat the waste felt carbon fiber, which can not only utilize the resin thermoplastic process to adsorb and fix nano-TiO2 on the resin, but also improve the surface roughness of the waste felt carbon fiber to form a composite waste felt carbon fiber, and as the composite waste felt carbon fiber is subjected to high temperature drying, the resin is further melted so that the TiO2 is wrapped and bonded, and the bonding force of the two is improved, so that the obtained modified waste felt carbon fiber has high mechanical strength. In addition, since a large amount of nano-TiO2 is adhered to the surface of the waste felt carbon fiber resin, the surface is also made to have good electrical conductivity, and nucleation sites can be provided for the crystallization of gypsum, the deposition of gypsum crystals at the interface of the waste felt carbon fiber is improved, and the crack resistance of the gypsum board is improved. Finally, a new type of gypsum board with functions such as crack resistance, conductivity and radiation protection was produced, which not only realized the high-value resource utilization of waste felt carbon fibers, but also produced multifunctional gypsum boards with significant economic and environmental benefits and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] The present invention will be further described below in conjunction with the accompanying drawings.

[0027] Figure 1 This is a SEM analysis diagram of the waste felt carbon fiber in Example 1 of the present invention;

[0028] Figure 2 This is a SEM analysis diagram of the modified waste felt carbon fiber in Example 1 of the present invention. DETAILED DESCRIPTION

[0029] The following will be combined with 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.

[0030] Embodiment 1:

[0031] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0032] Step A11, preparing a nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing the mixture for 2 hours at a temperature of 95° C. and a stirring rate of 500 r / min to obtain a nano-TiO2 solution; wherein the mass ratio of the nano-TiO2 powder to the clean water is 50:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 5 nm;

[0033] Step A12, preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, then dry it and place it in a nano-TiO2 solution, then stir and disperse it for 4 hours at a temperature of 25°C and a stirring rate of 500r / min, then let it stand for 1 hour, and then vacuum filter it to obtain a composite waste felt carbon fiber; wherein the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution is 30:100, wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 3mm;

[0034] Step A13, preparing modified waste felt carbon fiber: drying the composite waste felt carbon fiber at high temperature to obtain modified waste felt carbon fiber; wherein the high temperature drying temperature range of the waste felt carbon fiber is 140° C.;

[0035] Step A14, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 10 parts of modified waste felt carbon fiber, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts for use; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, wherein the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 150°C for 2h; wherein the coagulant is ammonium sulfate; wherein the foaming agent is aluminum powder;

[0036] Step A15, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol into a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with face paper, and the water absorption of the inner side of the face paper is 26g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0037] Embodiment 2:

[0038] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0039] Step A21, preparing a nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing the mixture for 3 hours at a temperature of 100° C. and a stirring rate of 600 r / min to obtain a nano-TiO2 solution; wherein the mass ratio of the nano-TiO2 powder to the clean water is 100:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 30 nm;

[0040] Step A22, preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, then dry it and place it in a nano-TiO2 solution, then stir and disperse it at a temperature of 30°C and a stirring rate of 600r / min for 5h, then let it stand for 2h, and then vacuum filter to obtain a composite waste felt carbon fiber; wherein the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution is 60:100, wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 21mm;

[0041] Step A23, preparing modified waste felt carbon fiber: drying the composite waste felt carbon fiber at high temperature to obtain modified waste felt carbon fiber; wherein the high temperature drying temperature range of the waste felt carbon fiber is 160° C.;

[0042] Step A24, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 10 parts of modified waste felt carbon fiber, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts for use; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, wherein the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 190°C for 2h; wherein the coagulant is calcium chloride; wherein the foaming agent is lithium peroxide;

[0043] Step A25, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with face paper, and the water absorption of the inner side of the face paper is 30g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0044] Embodiment 3:

[0045] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0046] Step A31, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts, and set aside; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, wherein the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 150° C. for 2 hours; wherein the coagulant is ammonium sulfate; wherein the foaming agent is aluminum powder;

[0047] Step A32, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with protective paper, the inner side of the protective paper has a water absorption capacity of 26g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0048] Embodiment 4:

[0049] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0050] Step A41, preparing a nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing the mixture for 3 hours at a temperature of 100° C. and a stirring rate of 600 r / min to obtain a nano-TiO2 solution; wherein the mass ratio of the nano-TiO2 powder to the clean water is 50:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 30 nm;

[0051] Step A42, preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, then dry it and place it in a nano-TiO2 solution, then stir and disperse it for 5 hours at a temperature of 30°C and a stirring rate of 600r / min, then let it stand for 2 hours, and then vacuum filter to obtain a composite waste felt carbon fiber; wherein the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution is 60:100, wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 21mm;

[0052] Step A43, preparing modified waste felt carbon fiber: drying the composite waste felt carbon fiber at high temperature to obtain modified waste felt carbon fiber; wherein the high temperature drying temperature range of the waste felt carbon fiber is 160° C.;

[0053] Step A44, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 5 parts of modified waste felt carbon fiber, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts, and set aside; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, and the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 190°C for 2h; wherein the coagulant is calcium chloride; wherein the foaming agent is lithium peroxide;

[0054] Step A45, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with protective paper, and the water absorption of the inner side of the protective paper is 30g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0055] Embodiment 5:

[0056] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0057] Step A51, preparing nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing for 2 hours at a temperature of 95°C and a stirring rate of 500r / min to obtain a nano-TiO2 solution; wherein the mass ratio of nano-TiO2 powder to clean water is 10:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 5nm;

[0058] Step A52, preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, then dry it and place it in a nano-TiO2 solution, then stir and disperse it for 4 hours at a temperature of 25°C and a stirring rate of 500r / min, then let it stand for 1 hour, and then vacuum filter to obtain a composite waste felt carbon fiber; wherein the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution is 30:100, wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 3mm;

[0059] Step A53, preparing modified waste felt carbon fiber: drying the composite waste felt carbon fiber at high temperature to obtain modified waste felt carbon fiber; wherein the high temperature drying temperature range of the waste felt carbon fiber is 140° C.;

[0060] Step A54, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 10 parts of modified waste felt carbon fiber, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts, and set aside; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, and the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 150°C for 2h; wherein the coagulant is ammonium sulfate; wherein the foaming agent is aluminum powder;

[0061] Step A55, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with protective paper, the inner side of the protective paper has a water absorption capacity of 26g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0062] Embodiment 6:

[0063] This embodiment is a method for preparing a functional gypsum board using waste felt carbon fibers, comprising the following steps:

[0064] Step A61, weighing raw materials: weighing 100 parts of gypsum clinker, 65 parts of water, 0.68 parts of coagulant, 10 parts of waste felt carbon fiber, 1 part of foaming agent, 1.3 parts of ethyl cellulose, and 1.6 parts of polyvinyl alcohol according to weight parts, and set aside; wherein the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, and the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 190°C for 2h; wherein the coagulant is calcium chloride; wherein the foaming agent is lithium peroxide; wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 21mm;

[0065] Step A62, preparing functional paper-faced gypsum board: adding gypsum clinker, water, coagulant, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, using the mortar mixer to mix the materials evenly to obtain slurry, and then injecting the slurry into a mold, and bonding the upper and lower surfaces with protective paper, the inner side of the protective paper has a water absorption capacity of 30g / m 2 , forming a board test block, demoulding the board test block after solidification, and then curing it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

[0066] The functional gypsum board in Examples 1-6 was tested for breaking load and impact resistance according to GB / T9775 gypsum board, and the conductivity of the gypsum board was tested using a conductivity tester. The test results are shown in the following table:

[0067] sample Longitudinal breaking load / kN Transverse fracture load / kN Impact resistance Conductivity / Ωcm Example 1 714 312 No cracks 243 Example 2 767 353 No cracks 286 Example 3 570 193 Obvious cracks 195 Example 4 693 298 No cracks 225 Example 5 687 305 No cracks 233 Example 6 674 263 Small cracks 197

[0068] The gypsum boards prepared in the above embodiments were tested for longitudinal breaking load, transverse breaking load, impact resistance and conductivity. As shown in the table above, it can be seen that when waste felt carbon fibers are not added to the gypsum board in Example 3, the breaking load and conductivity values ​​are relatively low, and obvious cracks appear after impact; although the addition of unmodified waste felt carbon fibers in Example 6 helps to improve the performance of the gypsum board, the improvement is limited; on this basis, by modifying the waste felt carbon fibers with different modification parameters, it can be found that the breaking load and conductivity of the gypsum board are significantly improved, and the more nano-TiO2 is used and the more modified waste felt carbon fibers are used, the greater the improvement effect of each index. The above results fully illustrate the necessity and outstanding effect of adding waste felt carbon fibers and modifying the waste felt carbon fibers.

[0069] The waste felt carbon fiber and the modified waste felt carbon fiber in Example 1 were subjected to SEM analysis. The SEM analysis of the waste felt carbon fiber is as follows: Figure 1 As shown in the figure, it can be seen that there are some parallel shallow indentations and granular rough surfaces on the surface of waste felt carbon fibers, which are conducive to the adhesion of TiO2, indicating that there is still residual resin on the surface of waste felt carbon fibers; SEM analysis of modified waste felt carbon fibers is shown in the figure. Figure 2 As shown, it can be seen that the surface of the modified waste felt carbon fiber is broken and not smooth, and there is particle accumulation, and the surface becomes more rough and uneven. This shows that the residual resin melts during high-temperature drying and adheres a large amount of nano-TiO2 to the surface of the waste felt carbon fiber, indicating that the waste felt carbon fiber and nano-TiO2 are successfully composited.

[0070] In the description of this specification, the description with reference to the terms "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0071] The above contents are merely examples and explanations of the present invention. Those skilled in the art may make various modifications or additions to the specific embodiments described or replace them in a similar manner. As long as they do not deviate from the invention or exceed the scope defined by the claims, they shall all fall within the protection scope of the present invention.

Claims

1. A functional paper-faced gypsum board prepared using waste felt carbon fiber, characterized in that: It includes a gypsum board core and a facing paper attached to the upper and lower sides of the gypsum board core; The gypsum board core comprises the following components in parts by weight: 90-110 parts of gypsum clinker, 60-80 parts of water, 0.1-2 parts of coagulant, 5-10 parts of modified waste felt carbon fiber, 1-3 parts of foaming agent, 1-3 parts of ethyl cellulose, and 1-2 parts of polyvinyl alcohol; the gypsum clinker is a mixture of phosphogypsum and desulfurized gypsum in a mass ratio of 3:7, and the phosphogypsum and desulfurized gypsum are both industrial by-product gypsum, which are obtained by calcining at 150-190°C for 2h; the coagulant is a mixture of one or two of ammonium sulfate and calcium chloride in any proportion; the foaming agent is a mixture of one or two of aluminum powder and peroxide in any proportion, and the peroxide is lithium peroxide; Wherein, the modified waste felt carbon fiber is prepared by the following steps: Step S1: preparing a nano-TiO2 solution: adding nano-TiO2 powder to clean water, and then stirring and dispersing for 2-3 hours at a temperature of 95-100°C and a stirring rate of 500-600r / min to obtain a nano-TiO2 solution; the mass ratio of the nano-TiO2 powder to the clean water in step S1 is 5-100:10000, wherein the clean water is ordinary urban tap water, and the particle size of the nano-TiO2 powder is 5-30nm; Step S2: preparing composite waste felt carbon fiber: clean the waste felt carbon fiber with clean water, dry it and place it in a nano-TiO2 solution, then stir and disperse it for 4-5 hours at a temperature of 25-30°C and a stirring rate of 500-600r / min, then let it stand for 1-2 hours, and then vacuum filter it to obtain a composite waste felt carbon fiber; the mass ratio of the waste felt carbon fiber to the nano-TiO2 solution in step S2 is 30-60:100, wherein the waste felt carbon fiber is a fiber filament taken from waste felt, and the length of the waste felt carbon fiber is 3-21mm; Step S3: preparing modified waste felt carbon fiber: drying the composite waste felt carbon fiber at high temperature to obtain modified waste felt carbon fiber; the high temperature drying temperature range of the waste felt carbon fiber in step S3 is 140-160°C.

2. The functional gypsum board prepared by using waste felt carbon fiber according to claim 1, characterized in that: The water absorption of the inner side of the face paper is 26-30g / m 2 .

3. The functional gypsum board prepared by using waste felt carbon fiber according to claim 1, characterized in that: The functional paper-faced gypsum board prepared by using waste felt carbon fiber is prepared by the following steps: Step 1: Weigh 90-110 parts of gypsum clinker, 60-80 parts of water, 0.1-2 parts of accelerator, 5-10 parts of modified waste felt carbon fiber, 1-3 parts of foaming agent, 1-3 parts of ethyl cellulose, and 1-2 parts of polyvinyl alcohol according to weight parts, and set aside; Step 2: Add gypsum clinker, water, accelerator, modified waste felt carbon fiber, foaming agent, ethyl cellulose and polyvinyl alcohol to a mortar mixer, use the mortar mixer to mix the materials evenly to obtain a slurry, and then inject the slurry into a mold, adhere facing paper on the upper and lower surfaces to form a board test block, and demold the board test block after it solidifies, and then cure it in an environment with a temperature of 80°C and a humidity of 50% for 24 hours to obtain the functional paper-faced gypsum board prepared using waste felt carbon fiber.

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