A method for preparing a cotton fiber-based simulated fiberboard

Abstract

The application relates to the technical field of resource utilization of waste and old textiles, in particular to a preparation method of cotton fiber-based simulation fiber board, which comprises a cotton fiber obtaining procedure, a cotton sheet preparation procedure of compressing cotton sheets by using cotton fibers and a compressing procedure, characterized in that, in the cotton fiber obtaining procedure: for knitted clothes, low-temperature freezing and embrittlement treatment is first carried out, and then tearing and opening are carried out to obtain first cotton fibers; for woven thick materials, tearing treatment is first carried out, and then wet opening is carried out to obtain second cotton fibers; for fluffy wadding materials, compression and densification treatment is first carried out, and then disassembling and opening are carried out to obtain third cotton fibers. The preparation method of the cotton fiber-based simulation fiber board can comprehensively utilize knitted clothes, woven thick materials and fluffy wadding materials in waste and old clothes, covers the range of general cloth, and thus realizes comprehensive utilization of the waste and old clothes.

Description

Technical Field

[0001] This invention relates to the field of waste textile resource utilization technology, specifically to a method for preparing high-performance simulated fiberboard using a wide variety of waste clothing. Background Technology

[0002] Globally, 90 million tons of textile waste are generated annually. In my country, the recycling rate of used clothing is less than 20%. Meanwhile, my country's dependence on imported timber exceeds 50%, and the supply of raw materials for traditional wood-based panels is tight. Therefore, utilizing used clothing to obtain cotton fibers and further processing them into fiberboard is a technological route that can improve the recycling rate of waste textiles, alleviate timber resource shortages, and increase the added value of waste textiles.

[0003] Some existing technical solutions involve extracting cotton fibers from waste clothing, mixing the cotton fibers with adhesives, and finally preparing fiberboard by pressing.

[0004] The technical solution disclosed in Chinese invention patent CN 107234703 B, entitled "High-performance fiberboard based on the recycling of waste cotton textiles and its preparation method," involves: first, cutting waste cotton fabric into scraps, soaking them in water, mixing the scraps with water, sodium hydroxide, and hydrogen peroxide, and then continuously cooking the mixture; washing with water, grinding the mixture using a disc mill, drying it, and then pulverizing it a second time to obtain cotton fibers; uniformly mixing polyisocyanate and cotton fibers to obtain sizing cotton fibers; laying the sizing cotton fibers and pre-pressing them to obtain a pre-pressed board; then heating it to 100-200℃, hot-pressing it, and cooling it to obtain a high-performance fiberboard. This fiberboard possesses excellent physical and mechanical properties, low water absorption, and environmentally friendly characteristics, and achieves the secondary high-value utilization of waste cotton textiles. The preparation process requires no special equipment and can be achieved using existing processing equipment, making it simple, easy to implement, and suitable for industrial production.

[0005] However, the above technical solutions have limitations such as complex processes (requiring chemical cooking) and limited applicability of raw materials. Summary of the Invention

[0006] This application provides a method for preparing a cotton fiber-based simulated fiberboard, aiming to solve the limitations of existing technologies such as complex processes and limited applicable raw materials, thereby achieving the technical effect of simplifying the process and comprehensively utilizing waste clothing raw materials. The specific technical solution adopted in this application is as follows:

[0007] A method for preparing a cotton fiber-based simulated fiberboard includes a cotton fiber acquisition step, a cotton sheet preparation step using cotton fibers to press cotton sheets, and a pressing step, wherein in the cotton fiber acquisition step:

[0008] For knitted garments, they are first subjected to low-temperature freezing and embrittlement treatment, and then shredded and loosened to obtain the first cotton fiber;

[0009] For thick woven fabrics, they are first shredded and then wet-opened to obtain a second cotton fiber.

[0010] For fluffy wadding, it is first compressed and compacted, and then disassembled and loosened to obtain the third cotton fiber.

[0011] In a preferred embodiment, the first cotton fiber has a fiber length of 15-25 mm, the second cotton fiber has a fiber length of 10-20 mm, and the third cotton fiber has a fiber length of 20-30 mm.

[0012] In a preferred embodiment, the processing temperature of the low-temperature freezing embrittlement treatment is (-20)~(-15)℃.

[0013] In a preferred embodiment, the compression ratio of the compression densification process is (5~6):1.

[0014] In a preferred embodiment, in the cotton sheet preparation process, the first cotton fiber and the third cotton fiber are pre-pressed to obtain the first cotton sheet and the third cotton sheet respectively; the first cotton fiber and the second cotton fiber are mixed, and the mixed fibers are pre-pressed to obtain the second cotton sheet.

[0015] In a preferred embodiment, the thickness of the first cotton pad, the second cotton pad, and the third cotton pad is 2-5 mm; the density of the first cotton pad and the second cotton pad is 400-450 g / cm³. 3 The density of the third cotton pad is 300~350 g / cm³. 3 .

[0016] In a preferred embodiment, during the pressing process, the first cotton sheet, the second cotton sheet, and the third cotton sheet are respectively glued and pressed, with a pressing temperature of 80~100℃ and a pressure of 2~3MPa, to obtain a first cotton fiber-based simulated fiberboard, a second cotton fiber-based simulated fiberboard, and a third cotton fiber-based simulated fiberboard.

[0017] In a preferred embodiment, during the pressing process, the first cotton sheet, the second cotton sheet, and the third cotton sheet are respectively glued, and then the first cotton sheet, the second cotton sheet, and the third cotton sheet are stacked sequentially from top to bottom. Finally, the stacked cotton sheets are pressed at a temperature of 85~105℃ and a pressure of 2.5~3.5MPa to obtain the cotton fiber-based simulated fiberboard.

[0018] In a preferred embodiment, the stacked cotton sheets include a plurality of second cotton sheets and the third cotton sheet.

[0019] In a preferred embodiment, during the application of adhesive, a modified starch adhesive is first coated onto the surfaces of the first cotton pad, the second cotton pad, and the third cotton pad, and after drying and curing, a sealing layer is formed. Then, an adhesive is applied to the surfaces of the first cotton pad, the second cotton pad, and the third cotton pad.

[0020] The method for preparing a cotton fiber-based simulated fiberboard according to this application firstly utilizes knitted clothing, woven thick fabrics, and fluffy wadding from waste clothing, which can cover the range of general fabrics, overcome the limitation of the single processing object of the existing technology, and realize the comprehensive utilization of waste clothing.

[0021] Secondly, the method for preparing a cotton fiber-based simulated fiberboard of this application can produce a waterproof, flame-retardant cotton fiber-based simulated fiberboard with good dimensional stability and surface hardness, which can be used as a veneer or board for kitchen and bathroom furniture. In particular, the first cotton sheet and the third cotton sheet are used as the two surfaces of the cotton fiber-based simulated fiberboard, so that the following can be selected as needed: (1) using the first cotton sheet as the surface can obtain better surface waterproof performance, and (2) using the third cotton sheet as the surface can obtain better finishing effect, and the printing is clearer and more delicate. At the same time, using the second cotton sheet as the middle layer can provide better structural strength, specifically, it has better bending strength, with a maximum bending strength of 28~50MPa.

[0022] Finally, the preparation method of the cotton fiber-based simulated fiberboard in this application employs physical processing methods, which simplify the processing steps and result in lower production costs compared to chemical processing. Furthermore, unlike existing technologies that involve applying adhesive to cotton fibers, this application uses a method of first pressing the cotton fibers into cotton sheets and then applying adhesive to the cotton sheets. This reduces the amount of adhesive required, thereby lowering production costs. Attached Figure Description

[0023] The accompanying drawings, which form part of this application, are used to provide further explanation of this application. The illustrative embodiments of this application and their descriptions are used to explain this application and do not constitute an undue limitation of this application.

[0024] Figure 1 This is a product photograph of the first cotton fiber-based simulated fiberboard of Embodiment 1 of this application.

[0025] Figure 2 This is a product photo of the cotton fiber-based simulated fiberboard of Embodiment 2 of this application. Detailed Implementation

[0026] The technical solutions in this application are described clearly and completely below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this application or its application or use. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] This application provides a method for preparing a cotton fiber-based simulated fiberboard, comprising: S1. sorting process, S2. cotton fiber acquisition process, S3. cotton sheet preparation process, and S4. pressing process.

[0028] S1. Sorting process

[0029] The main purpose of this process is to classify waste clothing into the following categories: C1. Knitted clothing, such as T-shirts and cardigans; C2. Thick woven fabrics, such as jeans and canvas bags; C3. Fluffy wadding, such as cotton clothing and quilts. Classification can be done manually or using any existing automated sorting device with a vision sorting system. An additional step is to separate the wrapper from the core of C3. Fluffy wadding. The core enters the next process as C3. Fluffy wadding, while the wrapper is sorted and classified as either C1. Knitted clothing or C2. Thick woven fabric. Of course, this process also requires manual or automated removal of obvious buttons, accessories, or decorations.

[0030] S2. Cotton fiber acquisition process

[0031] The main purpose of this process is to loosen different types of waste clothing according to their material and thickness.

[0032] For knitted garments, the fabric is first cut to obtain pieces approximately 50×50mm in size. This is followed by low-temperature freezing and embrittlement treatment, and finally shredding and opening to obtain the first cotton fibers. Specifically, the knitted garment is treated in a freezer for 10-12 minutes at a measured temperature of -20 to -15°C. Then, a hook-tooth shredder is used to coarsely open the fibers at 400 rpm. Next, atomized water at 60°C is sprayed approximately 0.3m above the coarsely opened cotton fibers at an 80° angle. The coarsely opened cotton fibers pass through the spray area for 1.0-1.5 seconds, resulting in a moisture content of approximately 10-11%. Precise moisture content control is not required here. Adding 0.1-0.2% antistatic agent to the atomized water reduces the surface resistance of the coarsely opened cotton fibers to <10 Ω·cm. 9Ω. Finally, a high-speed needle roller opener is used to fine open the coarsely opened cotton fibers at a linear speed of 25~30m / s to obtain first cotton fibers with a fiber length in the range of 15~25mm, with a fiber yield of approximately 82%. Those skilled in the art will know that a cotton box outlet equipped with a belt weighing is provided after the high-speed needle roller opener for quantitative measurement.

[0033] For thick woven fabrics, metal is first removed using a strong magnetic field, followed by shredding, and finally wet opening to obtain the second cotton fiber. Specifically, a high-strength magnetic conveyor line is used to remove any missed metal buttons, accessories, or small decorative items; manual sorting can be arranged if necessary. Then, a twin-shaft shredder with preferably H13 blades (2mm blade spacing) is used for coarse opening. Next, 60°C atomized water is sprayed approximately 0.3m above the coarsely opened cotton fiber at an 80° angle, with the fiber passing through the spray area for 3-4 seconds. The moisture content of the coarsely opened fiber is approximately 18-20%, although precise moisture content control is not required here. 0.1-0.2% antistatic agent is added to the atomized water. Finally, a high-speed needle roller opener is used at a linear velocity of 25-30m / s to finely open the coarsely opened cotton fiber, obtaining the second cotton fiber with a length in the range of 10-20mm, with a fiber yield of approximately 78%. Those skilled in the art will know that a cotton box outlet equipped with a belt weighing device is provided after the high-speed needle roller opener to facilitate quantitative measurement.

[0034] For the fluffy wadding, it is first compressed and compacted, then disassembled and opened to obtain the third cotton fiber. Specifically, atomized water at 60°C with 0.1-0.2% antistatic agent is sprayed about 0.3m above the fluffy wadding at an 80° angle. The wadding passes through the spray area for 2.0-2.5 seconds, and the moisture content of the fabric strip after passing through is about 10%. 0.1-0.2% antistatic agent is added to the atomized water. Subsequently, the fluffy wadding is fed into a hydraulic tank and held at a pressure of 1.0-1.1MPa for 10-15 seconds, aiming to achieve a compression ratio of (5-6):1. Finally, a toothed roller disassembly machine is used for coarse opening, followed by a high-speed needle roller opener at a linear speed of 25-30m / s to finely open the coarsely opened cotton fibers, obtaining the third cotton fiber with a fiber length in the range of 20-30mm, with a fiber yield of about 85%. Those skilled in the art will know that a cotton box outlet equipped with a belt weighing device is provided after the high-speed needle roller opener to facilitate quantitative measurement.

[0035] S3. Cotton Sheet Preparation Process

[0036] The first cotton fiber is conveyed, dispersed, and diffused using an air duct with an air pressure of 0.35~0.45MPa and an air velocity of 20~30m / s. Subsequently, it is shaped and moisture is released within a dust cage, resulting in a continuous fiber buildup thickness of 20~30mm. Afterward, it leaves the dust cage and enters a steel-cotton roller pressing line or other existing belt pre-pressing line, with a linear pressure of 5kN / m, compressing the thickness to 2~4mm, achieving a density of 400~450g / cm³. 3 The first cotton sheet has a moisture content of 10±2%. Finally, the continuous first cotton sheet is rolled up for storage or transfer, or it can go directly to the S4 pressing process without being rolled up, but the first cotton sheet should be cut to a suitable length before pressing.

[0037] The first and second cotton fibers are conveyed, dispersed, and mixed using an air duct. The air pressure within the duct is 0.35–0.45 MPa, and the air velocity is 20–30 m / s. The mixed cotton fibers are then diffused using the velocity difference. Next, the fibers are shaped and moisture is released within a dust cage, resulting in a continuous fiber buildup thickness of 20–30 mm. Afterward, the fibers leave the dust cage and enter a steel-cotton roller pressing line or other existing belt pre-pressing line, where the linear pressure is 4.5 kN / m, compressing the thickness to 3–5 mm and achieving a density of 400–450 g / cm³. 3 The second cotton sheet has a moisture content of 10±2%. Finally, the continuous second cotton sheet is rolled up for storage or transfer, or it can be directly sent to the S4 pressing process without being rolled up. However, the second cotton sheet should be cut to a suitable length before pressing.

[0038] The third cotton fiber is conveyed, dispersed, and diffused using an air duct with an air pressure of 0.35~0.45MPa and an air velocity of 20~30m / s. Subsequently, it is shaped and moisture is released within a dust cage, resulting in a continuous fiber buildup thickness of 20~30mm. Afterward, it leaves the dust cage and enters a steel-cotton roller pressing line or other existing belt pre-pressing line, with a linear pressure of 5kN / m, compressing the thickness to 2~3mm, achieving a density of 300~350g / cm³. 3 The third cotton sheet has a moisture content of 10±2%. Finally, the continuous third cotton sheet is rolled up for storage or transfer, or it can be directly sent to the S4 pressing process without being rolled up. However, the third cotton sheet should be cut to a suitable length before pressing.

[0039] S4. Pressing process

[0040] S4. The pressing process includes S4.1 the step of preparing modified starch adhesive, S4.2 the step of applying modified starch adhesive, S4.3 the step of drying, S4.4 the step of applying adhesive and S4.5 the step of hot pressing.

[0041] The modified starch adhesive comprises 100 parts of oxidized starch (carboxyl content 0.18%), 3-4 parts of epichlorohydrin crosslinking agent, 4-5 parts of nano-montmorillonite (MMT), 15-16 parts of butyl acrylate grafted monomer, and 12-13 parts of PAPI isocyanate. The modified starch adhesive has a final solids content of 45-50%, a viscosity of 5000±500 mPa·s (25°C), and a thixotropic index of 3.2-3.3.

[0042] The preparation method is as follows (taking 1000g of modified oxidized starch as an example):

[0043] S4.1.1 Add 80-90g of deionized water to the reactor. The amount added is about 10% of the final solid content. The temperature of the deionized water in the reactor is 25℃, and the speed of the stirrer in the reactor is 200rpm.

[0044] S4.1.2 Continue stirring and slowly add 1000g of oxidized starch (0.18% carboxyl group) over 5 minutes to avoid clumping and to form a low-viscosity suspension.

[0045] S4.1.3 Continue stirring and heat to 80±2℃, keep warm for 10~15min to completely gelatinize the starch and increase the viscosity;

[0046] S4.1.4 Continue stirring and add 3g of NaHCO3 (buffer) within 2 minutes. The amount added is 0.3% of the amount of oxidized starch added, so as to maintain the pH value at 8.5~9.0.

[0047] S4.1.5 Continue stirring and add 30~40g of epichlorohydrin crosslinking agent, continue for 15min to complete crosslinking;

[0048] S4.1.6 Continue stirring and cooling to 60±2℃, slowly pour in 40~50g of ultrasonically treated nano-montmorillonite (MMT) slurry within 5min, and then intercalate for 20min;

[0049] S4.1.7 Continue stirring and cool to 45±1℃, add 150~160g of butyl acrylate grafting monomer, and then graft for 120min;

[0050] S4.1.8 Cooling down to <40℃, then discharge;

[0051] S4.1.9 Add 120~130g of PAPI isocyanate 10 minutes before use.

[0052] In step S4.2, the modified starch adhesive is applied to both sides of the first, second, and third cotton pads by spraying, with an application rate of 150~200g / m².

[0053] In step S4.3, the drying method involves passing the first, second, and third cotton sheets through a hot tunnel at a temperature of 80±2℃ for 2.0~2.5 minutes. After curing, a sealing layer of approximately 0.1mm is formed on the surface of the first, second, and third cotton sheets. This sealing layer is an adhesive layer that acts as a sealant, preventing excessive penetration of the epoxy resin adhesive, thereby reducing the amount of adhesive applied and manufacturing costs.

[0054] In step S4.4, epoxy resin adhesive (25% solid content) is applied to both sides of the first, second, and third cotton pads by spraying, with an application rate of 300~400g / m².

[0055] The S4.5 hot pressing step includes two implementation methods. The first implementation method involves pressing the first cotton sheet, the second cotton sheet, and the third cotton sheet separately at a pressing temperature of 80~100℃ and a pressure of 2~3MPa to obtain the first cotton fiber-based simulated fiberboard, the second cotton fiber-based simulated fiberboard, and the third cotton fiber-based simulated fiberboard.

[0056] The second implementation involves layering a first cotton sheet, a second cotton sheet, and a third cotton sheet sequentially from top to bottom, and finally pressing the layered cotton sheets at a temperature of 85-105°C and a pressure of 2.5-3.5 MPa to obtain a cotton fiber-based simulated fiberboard. Specifically, the layered cotton sheets may include multiple second and third cotton sheets.

[0057] Example 1:

[0058] S1. Sorting process

[0059] Manual sorting is used. C1. Knitted garments include T-shirts and sweaters; C2. Thick woven fabrics include denim jackets and pants; and C3. Fluffy quilted fabrics include cotton quilts. By weight ratio, C1. Knitted garments account for 50%, of which T-shirts account for 20% and sweaters account for 10%; C2. Thick woven fabrics account for 30%; and C3. Fluffy quilted fabrics account for 20%.

[0060] S2. Cotton fiber acquisition process

[0061] For knitted garments, first cut fabric pieces to a size of approximately 50×50mm; then, treat the knitted garments at a temperature of (-20)~(-15)℃ for 10 minutes; next, use a hook-tooth shredder to coarsely open the fabric at a speed of 400rpm; then, spray 60℃ atomized water (with 0.2% antistatic agent added to the atomized water) at a distance of about 0.3m above the coarsely opened cotton fibers at a spray angle of 80°, and the coarsely opened cotton fibers pass through the spray area for 1.5s, and the moisture content of the coarsely opened fibers is about 10~11% after passing through; finally, use a high-speed needle roller opener to finely open the coarsely opened cotton fibers at a linear speed of 30m / s to obtain the first cotton fibers with a fiber length in the range of 15~25mm.

[0062] For thick woven fabrics, the metal is first removed by strong magnetic removal; then, a twin-shaft shredder with H13 blades (blade spacing 2mm) is used for coarse opening; next, 60°C atomized water (with 0.2% antistatic agent added) is sprayed about 0.3m above the coarsely opened cotton fibers at an angle of 80°, and the passage time of the coarsely opened cotton fibers in the spray area is 4s, and the moisture content of the coarsely opened fibers after passing through is about 18~20%; finally, a high-speed needle roller opener is used to finely open the coarsely opened cotton fibers at a linear speed of 30m / s to obtain a second cotton fiber with a fiber length in the range of 10~20mm.

[0063] For the fluffy wadding, first spray 60°C atomized water (with 0.1-0.2% antistatic agent added) at a distance of about 0.3m above the fluffy wadding at an angle of 80°. The fluffy wadding passes through the spray area for 2.5s, and the moisture content of the fabric strip after passing through is about 10%. Then, the fluffy wadding is fed into a hydraulic tank and held at a pressure of 1.0-1.1MPa for 15s. Considering the possible thickness rebound, the actual compression ratio is in the range of (5-6):1. Finally, a toothed roller type disassembly machine is used to perform coarse opening treatment, and then a high-speed needle roller type opening machine is used to fine open the coarsely opened cotton fibers at a linear speed of 25-30m / s to obtain third cotton fibers with a fiber length in the range of 20-30mm.

[0064] S3. Cotton Sheet Preparation Process

[0065] In the first processing line, the first cotton fiber is conveyed, dispersed, and diffused using an air duct with an air pressure of 0.4 MPa and a wind speed of 28 m / s. Subsequently, it is shaped and moisture is released within a dust cage, resulting in a continuous fiber buildup thickness of 25 mm. Afterward, it leaves the dust cage and enters a steel-cotton roller pressing line or other existing belt pre-pressing line, with a linear pressure of 5 kN / m, compressing the thickness to 3 mm and achieving a density of 400~450 g / cm³. 3The first cotton sheet has a moisture content of 10±2%. Finally, the continuous first cotton sheet is cut into appropriate lengths and directly enters the S4 pressing process.

[0066] In the second processing line, the first and second cotton fibers are conveyed, dispersed, and mixed using an air duct. The air pressure inside the duct is 0.4 MPa, and the wind speed is 28 m / s. The mixed cotton fibers are then diffused using the wind speed difference. Next, the fibers are shaped and moisture is released in a dust cage, resulting in a continuous fiber stack thickness of 25 mm. Afterward, the fibers leave the dust cage and enter a steel-cotton roller pressing line or other existing belt pre-pressing line, where the linear pressure is 4.5 kN / m, compressing the thickness to 4 mm and achieving a density of 400~450 g / cm³. 3 The second cotton sheet has a moisture content of 10±2%. Finally, the continuous second cotton sheet is cut into appropriate lengths and directly enters the S4 pressing process.

[0067] In the third processing line, the third cotton fiber is conveyed, dispersed, and diffused using an air duct with an air pressure of 0.4 MPa and a wind speed of 25 m / s. Subsequently, it is shaped and moisture is released within a dust cage, resulting in a continuous fiber buildup thickness of 25 mm. Afterward, it leaves the dust cage and enters a steel-cotton roller pressing line or other existing belt pre-pressing line, with a linear pressure of 5 kN / m, compressing the thickness to 3 mm and achieving a density of 300~350 g / cm³. 3 The third cotton sheet has a moisture content of 10±2%. Finally, the continuous third cotton sheet is cut into appropriate lengths and directly enters the S4 pressing process.

[0068] S4. Pressing process

[0069] The modified starch adhesive comprises 100 parts of oxidized starch (carboxyl content 0.18%), 4 parts of epichlorohydrin crosslinking agent, 4 parts of nano-montmorillonite (MMT), 15 parts of butyl acrylate grafted monomer, and 13 parts of PAPI isocyanate. The modified starch adhesive has a final solids content of 45-50%, a viscosity of 5000±500 mPa·s (25°C), and a thixotropic index of 3.2-3.3.

[0070] Modified starch adhesive was applied to both sides of the first, second, and third cotton pads using a spraying method, with an application rate of 150~200g / m². The first, second, and third cotton pads were then passed through a hot tunnel at a temperature of 80±2℃ for 2.5 minutes.

[0071] Epoxy resin adhesive (25% solid content) was applied to both sides of the first, second and third cotton pads by spraying, with an application rate of 300~400g / m².

[0072] Three groups of first cotton sheets were pressed using pressing processes of 80℃ / 2MPa / 4h, 90℃ / 3MPa / 4h, and 100℃ / 2MPa / 4h, respectively, with a thickness of 2.4mm. The resulting first cotton fiber-based simulated fiberboards were labeled as specimens 1-1 (reference). Figure 1 As shown), specimens 1-2 and 1-3.

[0073] Three groups of second cotton sheets were pressed using pressing processes of 80℃ / 2MPa / 4h, 90℃ / 3MPa / 4h, and 100℃ / 2MPa / 4h, respectively, with a thickness of 3.2mm. The resulting second cotton fiber-based simulated fiberboards were labeled as specimens 2-1 (reference). Figure 1 As shown), specimens 2-2 and 2-3.

[0074] Three groups of third cotton sheets were pressed using pressing processes of 80℃ / 2MPa / 4h, 90℃ / 3MPa / 4h, and 100℃ / 2MPa / 4h, respectively, with a thickness of 2.4mm. The resulting third cotton fiber-based simulated fiberboards were labeled as specimens 3-1 (reference). Figure 1 As shown), specimens 3-2 and 3-3.

[0075] The prepared cotton fiber-based simulated fiberboard has relatively high waterproof performance, flame retardant performance, dimensional stability and mechanical strength. For specific product performance, please refer to Table 1.

[0076] Table 1

[0077]

[0078] The first, second, and third cotton fiber-based simulated fiberboards prepared in this embodiment can be used directly or after printing and dyeing as veneer materials for kitchen and bathroom furniture.

[0079] Example 2: The difference between this example and Example 1 is that the first cotton sheet, the second cotton sheet, and the third cotton sheet are stacked sequentially from top to bottom. Finally, the three sets of stacked cotton sheets are pressed. The pressing processes are 85℃ / 2.5MPa / 4h, 95℃ / 3.5MPa / 4h, and 105℃ / 2.5MPa / 4h, respectively, with a thickness of 7mm. The obtained cotton fiber-based simulated fiberboard is marked as specimen 4-1 (refer to...). Figure 2 As shown), specimens 4-2 and 4-3.

[0080] The prepared cotton fiber-based simulated fiberboard has relatively high waterproof performance, flame retardant performance, dimensional stability and mechanical strength. For specific product performance, please refer to Table 2.

[0081] Table 2

[0082]

[0083] The cotton fiber-based simulated fiberboard prepared in this embodiment can be used directly or after printing and dyeing as a veneer material for kitchen and bathroom furniture, or directly or after printing and dyeing as a board material for kitchen and bathroom furniture.

[0084] Example 3: The difference between this example and Example 2 is that the stacked cotton sheets include 3 second cotton sheets and 3 third cotton sheets. The assembly sequence is first cotton sheet, second cotton sheet, third cotton sheet, second cotton sheet, third cotton sheet, second cotton sheet, third cotton sheet, and third cotton sheet. The thickness is 18mm (using a thickness gauge, the compression rate during the pressing stage is 75%). The obtained cotton fiber-based simulated fiberboards are marked as specimens 5-1, 5-2, and 5-3, respectively.

[0085] The prepared cotton fiber-based simulated fiberboard has relatively high waterproof performance, flame retardant performance, dimensional stability and mechanical strength. For specific product performance, please refer to Table 3.

[0086] Table 3

[0087]

[0088] The cotton fiber-based simulated fiberboard prepared in this embodiment can be used directly or after printing and dyeing as a board material for kitchen and bathroom furniture.

[0089] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for preparing a cotton fiber-based simulated fiberboard, comprising a cotton fiber acquisition step, a cotton sheet preparation step using cotton fibers to press cotton sheets, and a pressing step, characterized in that, In the cotton fiber acquisition process: For knitted garments, they are first subjected to low-temperature freezing and embrittlement treatment, and then shredded and loosened to obtain the first cotton fiber; For thick woven fabrics, they are first shredded and then wet-opened to obtain a second cotton fiber. For fluffy wadding, it is first compressed and compacted, and then disassembled and loosened to obtain the third cotton fiber.

2. The method for preparing cotton fiber-based simulated fiberboard according to claim 1, characterized in that, The first cotton fiber has a fiber length of 15-25 mm, the second cotton fiber has a fiber length of 10-20 mm, and the third cotton fiber has a fiber length of 20-30 mm.

3. The method for preparing cotton fiber-based simulated fiberboard according to claim 1, characterized in that, The processing temperature for the low-temperature freezing embrittlement treatment is (-20)~(-15)℃.

4. The method for preparing cotton fiber-based simulated fiberboard according to claim 1, characterized in that, The compression ratio of the compression densification process is (5~6):

1.

5. The method for preparing cotton fiber-based simulated fiberboard according to claim 1, characterized in that, In the cotton sheet preparation process, the first cotton fiber and the third cotton fiber are pre-pressed to obtain the first cotton sheet and the third cotton sheet; the first cotton fiber and the second cotton fiber are mixed, and the mixed fibers are pre-pressed to obtain the second cotton sheet.

6. The method for preparing cotton fiber-based simulated fiberboard according to claim 5, characterized in that, The thickness of the first cotton pad, the second cotton pad, and the third cotton pad is 2-5 mm; the density of the first cotton pad and the second cotton pad is 400-450 g / cm³. 3 The density of the third cotton pad is 300~350 g / cm³. 3 .

7. The method for preparing cotton fiber-based simulated fiberboard according to claim 6, characterized in that, In the pressing process, the first cotton sheet, the second cotton sheet, and the third cotton sheet are respectively glued and pressed. The pressing temperature is 80~100℃, the pressure is 2~3MPa, and the time is 3.5~4h to obtain the first cotton fiber-based simulated fiberboard, the second cotton fiber-based simulated fiberboard, and the third cotton fiber-based simulated fiberboard.

8. The method for preparing cotton fiber-based simulated fiberboard according to claim 6, characterized in that, In the pressing process, the first cotton sheet, the second cotton sheet, and the third cotton sheet are respectively glued, and then the first cotton sheet, the second cotton sheet, and the third cotton sheet are stacked in sequence from top to bottom. Finally, the stacked cotton sheets are pressed at a temperature of 85~105℃, a pressure of 2.5~3.5MPa, and a time of 3.8~4h to obtain the cotton fiber-based simulated fiberboard.

9. The method for preparing cotton fiber-based simulated fiberboard according to claim 8, characterized in that, The stacked cotton sheets include a plurality of second cotton sheets and the third cotton sheet.

10. The method for preparing cotton fiber-based simulated fiberboard according to claim 7 or 8, characterized in that, During the application of adhesive, modified starch adhesive is first applied to the surfaces of the first cotton pad, the second cotton pad, and the third cotton pad. After drying and curing, a sealing layer is formed. Then, adhesive is applied to the surfaces of the first cotton pad, the second cotton pad, and the third cotton pad.

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