Calcium-based microporous carbon fiber carton board, formula and preparation method

Abstract

The invention discloses a calcium-based microporous carbon fiber carton board, a formula and a preparation method. The calcium-based microporous carbon fiber carton board is prepared from macromolecular calcium crystal master batches and carbon fiber powder in a mass ratio of (10: 1)-(3: 1), wherein the high-molecular calcium crystal master batch comprises calcite as a base material; adding a base material and an auxiliary agent; the mass ratio of the calcite to the base material to the auxiliary agent is (67%-84%): (15%-30%): (1%-3%). The preparation method comprises the following steps: pretreating each raw material; weighing the raw materials according to a preset proportion; putting the raw materials into a high-speed hot mixing machine to form a first pretreated material; putting the first pretreated material into a low-speed cold mixer to form a second pretreated material; and carrying out extrusion molding, cutting and packaging on the basis of the second pretreated material. The composite material is excellent in mechanical property, good in forming stability and wide in application prospect.

Description

Technical Field

[0001] This application belongs to the field of sheet technology, specifically relating to a calcium-based microporous carbon fiber carton sheet, its formulation, and its preparation method. Background Technology

[0002] With the rapid development of industries such as logistics packaging, food warehousing, and electronic component transportation, diversified demands have been placed on the comprehensive performance of packaging boards. These demands require not only basic characteristics such as lightweight and low cost, but also advanced requirements such as strength, weather resistance, customized functions (e.g., thermal insulation), and environmental recyclability. Calcium-based packaging boards have become a research hotspot in the packaging materials field in recent years due to their wide availability of raw materials, low cost, and superior biodegradability compared to traditional plastic boards. Currently, mainstream calcium-based packaging board technologies are mainly divided into three categories: traditional calcium-plastic board technology, pure carbon fiber reinforced board technology, and ordinary calcium-fiber composite board technology. However, all of these have significant shortcomings in practical applications and are difficult to adapt to the high-performance requirements of various scenarios. Traditional calcium-plastic boards suffer from weak mechanical properties, limited functionality, and poor molding stability; pure carbon fiber reinforced boards are too expensive, limiting their large-scale application; and ordinary calcium-fiber composite boards have an uncoordinated composite system, limited performance improvement, and poor stability. Therefore, there is an urgent need to develop a calcium-based microporous carbon fiber carton board, its formulation, and preparation method that offers excellent mechanical properties, good molding stability, and broad application prospects. Summary of the Invention

[0003] In view of the shortcomings or deficiencies of the prior art, the technical problem to be solved by this application is to provide a calcium-based microporous carbon fiber carton board, its formulation and preparation method, which has excellent mechanical properties, good molding stability and broad application prospects.

[0004] To solve the above-mentioned technical problems, this application provides the following technical solution: This application proposes a formulation for calcium-based microporous carbon fiber cardboard, comprising: The mass ratio of polymeric calcium crystal masterbatch to carbon fiber powder is 10:1 to 3:1; The polymeric calcium crystal masterbatch includes: Calcite is the base material; Add base materials and additives; The mass ratio of the calcite, the substrate, and the additives is (67%-84%):(15%-30%):(1%-3%), wherein the substrate is high-density polyethylene or a copolymer of high-density polyethylene and polypropylene; the above materials are subjected to high-temperature intensive mixing, modification treatment, and the resulting polymeric calcium crystal masterbatch is prepared.

[0005] The calcite used as the source of calcium carbonate powder is ground and processed to achieve a calcium content of 93%-98%. The selected calcium powder has a mesh size of 500-800, and the specific addition ratio can be flexibly configured according to actual production needs.

[0006] Further optionally, the additives include heat stabilizers, plasticizers, lubricants, coupling agents and colorants, and the mass ratios of their addition are (0.2%-0.5%): (0.3%-0.8%): (0.2%-0.5%): (0.2%-0.5%): (0.1%-0.7%).

[0007] Further optionally, the heat stabilizer includes: environmentally friendly calcium-zinc stabilizer or organotin stabilizer, with an applicable temperature range of 180-220°C; And / or, the plasticizer includes: non-toxic dioctyl phthalate (DOP) or epoxidized soybean oil-based environmentally friendly plasticizers; And / or, the lubricant is: stearic acid or polyethylene wax; And / or, the coupling agent is: a silane coupling agent (such as KH-550) or a titanate coupling agent; And / or, the colorant is titanium dioxide or iron oxide pigment.

[0008] Further optionally, it also includes: an appropriate amount of excipients, said excipients including: calcium carbonate filler or glass microspheres.

[0009] This application also proposes a method for preparing calcium-based microporous carbon fiber cardboard, the method comprising: Pretreatment of each raw material; including the drying treatment of the carbon fiber powder mentioned above; Weigh the above raw materials according to the preset ratio; the specific formula ratio is: the mass composition of polymer calcium crystal masterbatch and carbon fiber powder is 10:1~3:1; The above raw materials are put into a high-speed hot mixer to form the first pre-treated material; under the action of high-speed rotation and frictional heat generation, the material temperature rises to 110-120℃, so that the components are initially mixed evenly. The first pretreated material is fed into a low-speed cold mixer to form the second pretreated material. The hot-mixed material is immediately placed into the low-speed cold mixer, where it is rapidly cooled to below 40-50°C using jacketed cooling water. This low-temperature cold mixing treatment effectively prevents material agglomeration and thermal degradation, and facilitates subsequent extrusion feeding. Extrusion molding based on the second pretreated material; The cutting and packaging process, specifically, preferably adopts fixed-length cutting: the continuous board after extrusion molding or film coating as described below is precisely cut according to the set length by an automatic fixed-length cutting saw; inspection and stacking: the finished boards are initially inspected (such as surface defects, size measurement), and then automatically stacked; packaging and warehousing: the stacked boards are packaged with stretch film or packing straps, labeled and then put into storage.

[0010] Further optionally, the above-mentioned pretreatment of raw materials includes: drying treatment.

[0011] Further optionally, the above-described extrusion molding process includes: Vacuum feeding, specifically, involves feeding the cooled mixture into the hopper of the extruder via a vacuum conveying system; In melt plasticizing extrusion, the material undergoes processes such as conveying, compression, melting, and homogenization in a twin-screw extruder. The high-speed shearing and external heating of the twin-screw extruder completely plasticize the polymer calcium crystal masterbatch and thoroughly mix carbon fiber powder and other materials into a homogeneous melt. In the mold forming process, the high-temperature molten material is extruded into a flat, internally porous structure through a specially designed coat hanger-type flat die head hollow mold. The precision of the mold determines the uniformity of the thickness of the sheet. The aforementioned mold can be made using existing equipment. Further, the high-temperature slab formed by the above-mentioned mold enters the three-roll calender for shaping and cooling treatment. Function 1 (shaping): By precisely adjusting the gap and temperature of the three rolls, the slab is calendered and shaped to the required thickness and surface finish; Function 2 (cooling): Cooling water is circulated inside the three rolls to begin the initial cooling of the slab. And traction.

[0012] Further optionally, the above-mentioned traction includes: traction using a cooling method and traction using a constant speed method. In the above-mentioned traction using a cooling method, preferably, the sheet material that has been initially shaped by three rollers enters the cooling bracket, and a vacuum shaping table or multiple sets of cooling rollers with a series of cooling water pipes are used to thoroughly cool and solidify the sheet material by combining water cooling and air cooling.

[0013] More preferably, in the above-mentioned constant speed traction method, the traction machine pulls the cooled and formed sheet forward smoothly at a constant speed to ensure the continuity of production and the stable linear speed of the sheet.

[0014] Optionally, the process further includes a surface decoration process, wherein a decorative film is laminated onto the surface of the extruded substrate. Specifically, the substrate surface is subjected to corona treatment to increase surface energy and enhance adhesion to the decorative film; then, the decorative film (roll) and the substrate are simultaneously fed into a high-temperature laminating machine, where, under high temperature (approximately 180-220 °C) and high pressure (via pressure rollers), the hot melt adhesive layer on the back of the decorative film is activated and firmly bonded to the substrate; next, immediate cooling and shaping are performed to ensure that the decorative film does not separate from the substrate.

[0015] More preferably, in the above-mentioned polymer masterbatch preparation process, the substrate is high-density polyethylene (PE) or a copolymer of high-density polyethylene and polypropylene.

[0016] More preferably, the additive is used to improve processability and final performance, and the components are formulated in the required proportions: Heat stabilizer (0.2%-0.5%): Prevents degradation of polypropylene or polyethylene during high-temperature processing. Environmentally friendly calcium-zinc stabilizers or organotin stabilizers are preferred. Applicable temperature range: 180-220°C.

[0017] Plasticizer (0.3%-0.8%): Increases the flexibility of the board and reduces brittleness. It is preferred to use non-toxic dioctyl phthalate (DOP) or environmentally friendly plasticizers such as epoxidized soybean oil.

[0018] Lubricant (0.2%-0.5%): Improves processing fluidity and reduces equipment wear; stearic acid or polyethylene wax is preferred.

[0019] Coupling agent (0.2%-0.5%): A key modifier used to enhance the interfacial adhesion between calcite and the substrate. Preferably, a silane coupling agent (such as KH-550) or a titanate coupling agent is used, and surface treatment improves filler dispersibility and composite strength.

[0020] Colorant (0.1%-0.7%): Provides color options such as titanium dioxide (white) or iron oxide pigments to ensure uniform color.

[0021] In one embodiment, the formulation is optimized using response surface methodology or design of experiments (DOE) to ensure optimal performance: for example, the flexural strength and abrasion resistance of the sheet reach peak values ​​when the calcite content is 75%, polyethylene is 22%, and additives are 3%. The calcite and substrate used in this application are both recyclable materials, and the additives are non-toxic and compliant with RoHS and REACH standards.

[0022] Furthermore, the preparation of the aforementioned polymeric calcium crystal masterbatch also includes: high-temperature internal mixing using a mixer or twin-screw extruder. Specifically, the preferred process parameters are: Temperature: 180-220°C, segmented control (feeding zone 180°C, mixing zone 200°C, discharge zone 220°C).

[0023] Time: 5-10 minutes, to ensure complete melting and uniform dispersion.

[0024] Rotation speed: 30-50 rpm, avoid over-shearing.

[0025] Output: The intensively mixed material is cut into high-molecular-weight calcium crystal masterbatches (2-4 mm in diameter) using a granulator for subsequent extrusion. The high-molecular-weight calcium crystal masterbatches prepared by the above process have uniform composition and flowability.

[0026] This application also proposes a calcium-based microporous carbon fiber carton board, which is prepared based on the aforementioned preparation method.

[0027] Compared with the prior art, this application has the following technical effects: This application selects the characteristic ratio of polymeric calcium crystal masterbatch and carbon fiber powder as the basis, which significantly enhances the bridging and reinforcing effect of carbon fiber, greatly improves the bending and compressive strength of the board, and has broad application prospects. Detailed Implementation

[0028] The technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0029] Implementation Method 1 ① Raw material pretreatment: Select 800-mesh high-molecular calcium crystal masterbatch (calcium content 42%) and 60 μm long short carbon fiber powder, and dry them with hot air at 85℃ for 3 hours to control the moisture content ≤0.03% to improve the bonding stability between raw materials.

[0030] ② Raw material weighing: Weigh 100 kg of high molecular weight calcium crystal masterbatch and 33.3 kg of carbon fiber powder at a mass ratio of 3:1. The combination of the above raw materials can further enhance the reinforcing effect of carbon fiber.

[0031] ③ High-speed hot mixing: Put it into a 1200 L high-speed hot mixer, rotate at 1700 r / min, heat to 112℃, keep it warm and stir for 7 minutes. The high speed ensures that a high proportion of carbon fibers are evenly dispersed and avoids agglomeration.

[0032] ④ Low-speed cold mixing: Transfer to a low-speed cold mixer at a speed of 300 r / min to rapidly cool to 43℃. When discharging, the material particles are evenly dispersed and there is no local carbon fiber enrichment.

[0033] ⑤ Extrusion Molding: Vacuum feeding system for feeding; Twin-screw extruder barrel temperatures: feeding section 155℃, compression section 165℃, melting section 170℃, homogenization section 175℃, screw speed 220 r / min, enhancing shearing action to promote carbon fiber dispersion; flat die head gap set at 4 mm, extruded slab thickness 4.2 mm; three-roll calender roller temperature 85℃, roller gap 4.0 mm, pressure 0.2 MPa, improving slab density; cooling support uses multiple sets of cooling rollers for progressive cooling, water temperature 22℃, traction speed 4 m / min, to ensure complete curing of the slab; ⑥ Surface decoration: Corona treatment (voltage 16 kV, processing speed 4 m / min) to improve surface energy; use high-strength PP decorative film (thickness 0.08 mm), laminator temperature 200℃, pressure roller pressure 0.4 MPa, and air cooling in the cooling section to ensure firm bonding.

[0034] ⑦ Cutting and Packaging: The cutting length is set at 1500 mm. The key inspection points are bending strength (≥30 MPa) and tensile strength (≥25 MPa). Five pieces are stacked together, packaged with steel straps, and labeled "High-Strength Industrial Packaging" with a load-bearing capacity rating (≤80 kg / m²). 2 Then it is put into storage.

[0035] This embodiment is applicable to high-strength industrial boards, can replace some wooden packaging boards, and has a longer service life compared to traditional plastic boards.

[0036] Implementation Method 2 ① Raw material pretreatment: Select 800-mesh high-molecular calcium crystal masterbatch (calcium content 44%) and 50 μm long short carbon fiber powder, and send them into a hot air dryer to dry at 80℃ for 2 hours. Control the moisture content of the raw materials to ≤0.05% to ensure that there are no bubble defects after molding.

[0037] ② Raw material weighing: Weigh 100 kg of high molecular weight calcium crystal masterbatch and 12.5 kg of carbon fiber powder at a mass ratio of 8:1, without adding any other auxiliary fillers, in order to simplify the raw material system.

[0038] ③ High-speed hot mixing: Put the materials into a 1000 L high-speed hot mixer, rotate at 1500 r / min, and heat up to 115℃ through frictional heat generation. Keep it warm and stir for 5 minutes to ensure that the two raw materials are fully and evenly mixed.

[0039] ④ Low-speed cold mixing: Transfer to a low-speed cold mixer at a speed of 300 r / min. The material is rapidly cooled to 45℃ by cooling water in the jacket. When discharged, the material is in loose granular form and there is no clumping.

[0040] ⑤ Extrusion Molding: The vacuum feeding system feeds the mixture into the hopper of the twin-screw extruder; the barrel temperature is set in sections: feeding section 160℃, compression section 170℃, melting section 175℃, homogenization section 180℃, and the screw speed is 200 r / min to ensure uniform melt viscosity; the gap of the coat hanger type flat die head is set to 3 mm, and the thickness of the extruded slab is 3.2 mm; the roller temperature of the three-roll calender is 80℃, and the roller gap is 2.8 mm to achieve shaping and preliminary cooling; the cooling bracket adopts a combination of "water cooling + air curtain" cooling, with a water temperature of 25℃ and an air speed of 5 m / s to reduce the temperature of the slab to below 40℃; the traction machine speed is 5 m / min, which matches the extrusion speed to ensure continuous production.

[0041] ⑥ Surface decoration: Corona treatment is omitted. General-purpose PET decorative film (thickness 0.05 mm) is selected. The laminating machine temperature is 200℃, the pressure roller pressure is 0.3 MPa, and the cooling section water temperature is 20℃ to ensure that the film is firmly bonded without wrinkles.

[0042] ⑦ Cutting and Packaging: The automatic fixed-length cutting saw is set to a length of 1200 mm, and the cutting speed is synchronized with the traction speed; the key inspection points are surface finish (Ra≤1.0 μm) and dimensional deviation (±0.5 mm); each stack of 10 pieces is packaged with ordinary stretch film and labeled "General Packaging" before being put into storage.

[0043] Implementation Method 3 ① Raw material pretreatment: Select 800-mesh high-molecular calcium crystal masterbatch (calcium content 45%) and 50 μm long short carbon fiber powder, and send them into a hot air dryer to dry at 80℃ for 2 hours. Control the moisture content of the raw materials to ≤0.05% to avoid the formation of bubbles after molding.

[0044] ② Raw material weighing: Weigh 100 kg of high molecular weight calcium crystal masterbatch and 10 kg of carbon fiber powder at a mass ratio of 10:1, and simultaneously add 2 kg of nano-grade calcium carbonate filler (particle size 50 nm) to improve micropore uniformity.

[0045] ③ High-speed hot mixing: Put the above materials into a 1000L high-speed hot mixer, set the speed to 1500 r / min, and raise the material temperature to 115℃ through frictional heat generation. Keep it warm and stir for 5 minutes to ensure that the filler and the polymer calcium crystal masterbatch are initially fused.

[0046] ④ Low-speed cold mixing: Transfer the hot mixed material to a low-speed cold mixer at a speed of 300 r / min. The material is then rapidly cooled to 45°C by cooling water in the jacket and discharged for later use. At this point, the material is in a loose granular state without lumps.

[0047] ⑤ Extrusion Molding: The vacuum feeding system feeds the mixture into the hopper of the twin-screw extruder; the barrel temperature is set in sections as follows: feeding section 160℃, compression section 170℃, melting section 175℃, homogenization section 180℃, and the screw speed is 200 r / min to ensure uniform melt viscosity; the gap of the coat hanger type flat die head is set to 3 mm, and the thickness of the extruded slab is controlled at 3.2 mm; the roller temperature of the three-roll calender is set to 80℃, and the roller gap is 2.8 mm to achieve preliminary shaping and cooling; the cooling bracket adopts a combination of "water cooling + air curtain" cooling, with a water temperature of 25℃ and an air speed of 5 m / s to ensure that the temperature of the sheet material drops below 40℃; the traction machine speed is set to 5 m / min to match the extrusion speed.

[0048] ⑥ Surface decoration: Corona treatment (voltage 15 kV, processing speed 5 m / min) is used to enhance the surface energy of the substrate; food contact grade PET decorative film (thickness 0.05 mm) is selected, the laminating machine temperature is set to 200℃, the pressure roller pressure is 0.3MPa, and the cooling section water temperature is 20℃ to ensure that the film is bonded without wrinkles.

[0049] ⑦ Cutting and Packaging: The automatic fixed-length cutting saw is set to a length of 1200 mm, and the cutting speed is synchronized with the traction speed; the inspection focuses on the surface finish (Ra≤0.8μm) and dimensional deviation (±0.5 mm); 10 pieces are stacked together, packaged with food-grade stretch film, and labeled "For Food Packaging Only" before being put into storage.

[0050] This embodiment is applicable to food contact grade materials, with compatibility meeting standards. The water absorption rate of the board is ≤0.3%, and the temperature resistance range is -20℃ to 60℃, meeting the moisture-proof requirements for food storage and transportation. The production cost is lower than that of pure plastic packaging boards.

[0051] Implementation Method 4 ① Raw material pretreatment: Select 600-mesh high-molecular calcium crystal masterbatch (calcium content 50%) and 80 μm long short carbon fiber powder, and dry them with hot air at 90℃ for 3 hours to control the moisture content ≤0.03% to enhance the mechanical properties of the board.

[0052] ② Raw material weighing: Weigh 100 kg of high molecular weight calcium crystal masterbatch and 10 kg of carbon fiber powder at a mass ratio of 10:1, and add 5 kg of glass microspheres (particle size 100 μm) to improve impact resistance.

[0053] ③ High-speed hot mixing: Put the mixture into a 1200L high-speed hot mixer, rotate at 1600 r / min, heat to 120℃, keep warm and stir for 8 minutes to ensure uniform dispersion of glass microspheres.

[0054] ④ Low-speed cold mixing: Transfer to a low-speed cold mixer at a speed of 250 r / min, cool to 40℃, and the material particle size is uniform when discharged, with no local overheating.

[0055] ⑤ Extrusion molding: Vacuum feeding system for feeding; Twin-screw extruder barrel temperature: feeding section 165℃, compression section 175℃, melting section 180℃, homogenization section 185℃, screw speed 180 r / min, enhancing shearing and dispersion effect; flat die head gap set to 5 mm, extruded slab thickness 5.3 mm; Three-roll calender roller temperature 90℃, roller gap 4.8 mm, pressure 0.2 MPa, increasing slab density; Cooling bracket adopts multiple sets of cooling rollers for progressive cooling, water temperature 20℃, traction speed 3 m / min, ensuring complete curing of the slab.

[0056] ⑥ Surface decoration: Corona treatment can be omitted. Use wear-resistant PVC decorative film (0.1 mm thick), laminating machine temperature 220℃, pressure roller pressure 0.5MPa, and air cooling (wind speed 8 m / s) in the cooling section to improve the adhesion of the wear-resistant layer of the film.

[0057] ⑦ Cutting and Packaging: The cutting length is set at 1500 mm. The key inspection points are bending strength (≥25MPa) and surface abrasion resistance (Martindale abrasion resistance ≥5000 cycles); each stack of 5 pieces is packed with steel straps, labeled "Heavy-duty Packaging" and indicating the load-bearing capacity (≤50 kg / m). 2 Then it is put into storage.

[0058] In this embodiment, the glass microspheres and carbon fiber work together to enhance the impact strength, which is 30% higher than that of pure A-grade sheet material. The wear resistance meets the requirements for heavy goods to be used ≥50 times, and the breakage rate is reduced to below 0.5%.

[0059] Implementation Method 5 ① Raw material pretreatment: Select 800-mesh high-molecular calcium crystal masterbatch (calcium content 42%) and 40 μm long short carbon fiber powder, and dry them with hot air at 85℃ for 3 hours, controlling the moisture content to ≤0.03% to ensure the stability of the microporous structure.

[0060] ② Raw material weighing: Weigh 100 kg of high molecular weight calcium crystal masterbatch and 20 kg of carbon fiber powder at a mass ratio of 5:1, and add 4 kg of hollow glass microspheres (particle size 80 μm, thermal conductivity ≤0.04 W / (m·K)) to improve thermal insulation performance.

[0061] ③ High-speed hot mixing: Put it into a 1000 L high-speed hot mixer, rotate at 1400 r / min, heat to 118℃, keep it warm and stir for 7 minutes, and use a step-by-step speed increase (from 1000 r / min to 1400 r / min) to avoid the hollow microspheres from breaking.

[0062] ④ Low-speed cold mixing: Transfer to a low-speed cold mixer at a speed of 280 r / min, cool to 48℃, and use a screening device to remove any potentially broken microbeads when discharging.

[0063] ⑤ Extrusion Molding: The vacuum feeding system adopts low negative pressure feeding (negative pressure value 0.05 MPa); the barrel temperature of the twin-screw extruder is: feeding section 160℃, compression section 168℃, melting section 172℃, homogenization section 178℃, screw speed 190 r / min, and a low-shear screw configuration is adopted to protect the hollow microspheres; the flat die head adopts a special micropore design with a gap set at 4 mm, and the extruded slab thickness is 4.2 mm; the three-roll calender has a roller temperature of 75℃ and a roller gap of 4.0 mm, reducing the roller pressure (0.15 MPa) to avoid micropore compaction; the cooling bracket adopts gradient cooling (front section water temperature 30℃, rear section water temperature 20℃), with a traction speed of 4 m / min to ensure the integrity of the micropore structure.

[0064] ⑥ Surface decoration: Corona treatment (voltage 16 kV, processing speed 4 m / min); low-temperature resistant PE decorative film (temperature range -40℃~80℃, thickness 0.08 mm), laminating machine temperature 190℃, pressure roller pressure 0.3MPa, and low-temperature water cooling (water temperature 15℃) is used in the cooling section to ensure that the film does not fall off in low-temperature environments.

[0065] ⑦ Cutting and Packaging: The cutting length is set at 1400 mm. The key inspection points are thermal conductivity (≤0.06W / (m·K)) and low temperature resistance (no cracking after freezing at -40℃ for 24 h); waterproof stretch film is used for packaging, with 8 pieces per stack, and a "Cold Chain Dedicated" label is affixed for warehousing.

[0066] The hollow microspheres in this embodiment retain a complete microporous structure and have a thermal conductivity as low as 0.055 W / (m·K). They extend the insulation time by 40% compared to ordinary packaging boards and do not crack or deform in a low temperature environment of -40℃, making them suitable for the needs of cold chain transportation.

[0067] Implementation Method Six ① Raw material pretreatment: Select high-molecular calcium crystal masterbatch containing 30% recycled material (calcium content 43%, particle size 800 mesh) and recycled carbon fiber powder with a length of 50 μm, dry at 80℃ for 2 hours, control the moisture content ≤0.05% to improve the recycling rate.

[0068] ② Raw material weighing: Weigh 100 kg of recycled polymer calcium crystal masterbatch and 14.3 kg of recycled carbon fiber powder at a mass ratio of 7:1, add 2 kg of recycled calcium carbonate filler, and the total recycled component accounts for ≥65%.

[0069] ③ High-speed hot mixing: Put the mixture into a 1000L high-speed hot mixer, rotate at 1500 r / min, heat to 112℃, keep it warm and stir for 5 minutes, and add 0.5 kg of antioxidant to prevent thermal degradation of the recycled material.

[0070] ④ Low-speed cold mixing: Transfer to a low-speed cold mixer at 320 r / min, cool to 45℃, and then discharge for later use.

[0071] ⑤ Extrusion molding: Vacuum feeding system for feeding; Twin-screw extruder barrel temperature: feeding section 158℃, compression section 168℃, melting section 173℃, homogenization section 178℃, screw speed 210 r / min; flat die head clearance set to 3 mm, extruded slab thickness 3.1 mm; three-roll calender roller temperature 80℃, roller gap 2.9 mm; cooling bracket adopts water cooling + air cooling combination, water temperature 25℃, traction speed 5.5 m / min.

[0072] ⑥ Surface decoration: Corona treatment is omitted, and biodegradable PP decorative film (thickness 0.06 mm) is selected. The laminating machine temperature is 200℃, the pressure roller pressure is 0.3 MPa, and the cooling section is air-cooled.

[0073] ⑦ Cutting and Packaging: The cutting length is set at 1200 mm. The key inspection points are tensile strength (≥18MPa) and recyclability. Degradable packaging film is used for packaging, and "environmentally friendly and recyclable" labels are affixed before warehousing.

[0074] The above embodiments are only used to illustrate the technical solutions of this application and are not intended to limit it. The preferred embodiments have been described in detail. Those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this application without departing from the spirit and scope of the technical solutions of this application, and all such modifications and substitutions should be covered within the scope of the claims of this application.

Claims

1. A formulation for calcium-based microporous carbon fiber cardboard, characterized in that, include: The mass ratio of polymeric calcium crystal masterbatch to carbon fiber powder is 10:1 to 3:1; The polymeric calcium crystal masterbatch includes: Calcite is the base material; Add base materials and additives; The mass ratio of the calcite, the substrate, and the additive is (67%-84%):(15%-30%):(1%-3%), wherein the substrate is high-density polyethylene or a copolymer of high-density polyethylene and polypropylene.

2. The calcium-based microporous carbon fiber carton board formulation according to claim 1, characterized in that, The additives include heat stabilizers, plasticizers, lubricants, coupling agents, and colorants, and their mass ratios are (0.2%-0.5%): (0.3%-0.8%): (0.2%-0.5%): (0.2%-0.5%): (0.1%-0.7%).

3. The calcium-based microporous carbon fiber carton board formulation according to claim 2, characterized in that, The heat stabilizer includes: environmentally friendly calcium-zinc stabilizer or organotin stabilizer, with an applicable temperature range of 180-220°C; And / or, the plasticizer includes: non-toxic dioctyl phthalate or epoxidized soybean oil-based environmentally friendly plasticizers; And / or, the lubricant is: stearic acid or polyethylene wax; And / or, the coupling agent is: a silane coupling agent or a titanate coupling agent; And / or, the colorant is titanium dioxide or iron oxide pigment.

4. The calcium-based microporous carbon fiber carton board formulation according to claim 2 or 3, characterized in that, Also includes: Appropriate amount of excipients, including: calcium carbonate filler or glass microspheres.

5. A method for preparing calcium-based microporous carbon fiber cardboard as described in any one of claims 1 to 4, characterized in that, The preparation method includes: Pretreatment of each raw material; Weigh the above raw materials according to the preset proportions; The above raw materials are fed into a high-speed hot mixer to form the first pre-treated material; The first pretreated material is fed into a low-speed cold mixer to form the second pretreated material; Extrusion molding based on the second pretreated material; Cutting and packaging processes.

6. The preparation method according to claim 5, characterized in that, The above-mentioned pretreatment of raw materials includes: drying treatment.

7. The preparation method according to claim 5, characterized in that, The above-mentioned extrusion molding process includes: Vacuum feeding; Melt plasticizing extrusion; Mold forming; Shaping and cooling; And traction.

8. The preparation method according to claim 7, characterized in that, The aforementioned traction methods include both cooling-based traction and constant-speed traction.

9. The preparation method according to claim 8, characterized in that, The above-mentioned cooling method includes: the high-temperature slab formed by the above-mentioned mold enters the three-roll calender for shaping and cooling treatment.

10. The preparation method according to any one of claims 5 to 8, characterized in that, Also includes: The surface decoration process includes laminating a decorative film onto the surface of the substrate after extrusion molding.

11. A calcium-based microporous carbon fiber cardboard board, characterized in that, Prepared according to the preparation method described in any one of claims 5 to 10.