High-strength plastic building template material for replacing aluminum film

Abstract

The invention discloses a high-strength plastic building template material for replacing an aluminum film, relates to the technical field of building construction, and aims at solving the technical problems that an existing aluminum film is large in weight, high in cost and difficult to recycle, and an existing plastic template is insufficient in strength, poor in aging resistance and weak in adaptability. The material comprises a template body and a protective coating, the template body is prepared by melting, blending and extruding 60-75 parts of polycarbonate, 15-25 parts of ABS, 5-15 parts of reinforced fibers and other raw materials, and the core innovation is a basalt fiber and carbon fiber 2: 1 mixed reinforced system and a special combination of an SAG compatilizer and a carbodiimide hydrolysis-resistant agent; the protective coating is formed by coating and curing raw materials such as 1.0-1.5 parts of acrylic resin, 0.5-2.0 parts of nano silicon dioxide, 0.05-0.5 part of carbon dots and the like, and the anti-aging performance is remarkably improved by adding the carbon dots. The strength is close to that of an aluminum film, the weight is reduced by 30%-40%, the alkali resistance and the aging resistance are excellent, the aluminum film can be directly matched with an existing aluminum film supporting system, the turnover frequency reaches 50 times or above, the cost is only 50%-60% of that of the aluminum film, and the aluminum film is environmentally friendly, economical and suitable for pouring construction of various concrete structures. The core technical characteristics of the method are not disclosed in the prior art, and the method has remarkable novelty and creativity.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, specifically to a high-strength plastic building formwork material that can replace aluminum foil, suitable for various concrete structure pouring construction scenarios. Background Technology

[0002] In the construction industry, formwork is a core supporting material for concrete pouring and shaping. Among them, aluminum formwork is widely used in construction scenarios such as high-rise buildings due to its advantages such as high strength and high turnover rate. However, aluminum formwork has inherent technical defects: First, it is heavy. A standard 1220mm×2440mm aluminum formwork weighs about 35kg, resulting in difficulty in handling and high construction labor costs. Second, it is expensive. The cost of raw materials and processing makes the cost per square meter reach 180-220 yuan, significantly increasing the project construction cost. Third, it is inconvenient to use and recycle. It requires additional application of release agent, and the recycling process involves cumbersome dismantling and low residual value. Fourth, its adaptability is limited. Its application in small and medium-sized construction projects and complex working conditions is less economical.

[0003] To address the aforementioned shortcomings of aluminum formwork, the industry has gradually developed plastic formwork products as alternatives. However, existing plastic formwork still faces numerous technical bottlenecks, making it difficult to meet the comprehensive needs of actual construction: ① Insufficient strength and rigidity: The bending strength of existing plastic formwork is mostly 60-90MPa, far lower than that of aluminum formwork, failing to meet the requirements for flatness and load-bearing capacity in fair-faced concrete pouring; ② Poor resistance to environmental corrosion: It is prone to degradation when immersed in alkaline concrete environments and exposed to outdoor ultraviolet radiation, resulting in only 20-30 cycles of use and a short service life; ③ Poor low-temperature stability: It is prone to cracking in environments below -10℃, making it unsuitable for construction in cold regions; ④ Weak adaptability: The reinforcing rib structure and splicing hole design of existing plastic formwork are incompatible with the existing aluminum formwork support system, requiring additional modification of support components, increasing construction conversion costs and time.

[0004] A search of existing related technologies revealed the following: Chinese invention patent CN109679313A discloses a PC-ABS plastic building template with a PC ratio of 50-65 parts, reinforced with glass fiber, but without the addition of a special compatibilizer and anti-hydrolysis agent, and without a protective coating design, resulting in insufficient strength and poor alkali resistance; Chinese invention patent CN111232456A discloses a basalt fiber reinforced plastic template, which uses basalt fiber alone as the reinforcement, without involving a mixed reinforcement system of carbon fiber and basalt fiber, and the coating does not adopt an anti-aging modification design, resulting in limited UV resistance; Chinese invention patent CN108946721A discloses an adaptation structure for plastic templates and aluminum film support systems, but adopts a combined reinforcing rib design, resulting in insufficient overall rigidity of the template, and does not involve the synergistic design of specific resin ratios and high-performance coating systems.

[0005] In summary, no existing technology has disclosed a plastic formwork technical solution that combines high strength, lightweight, aging resistance, low cost, and direct compatibility with existing aluminum film support systems. Developing high-performance plastic building formwork materials that can fully replace aluminum film has become an urgent technical problem to be solved in the construction field. Summary of the Invention

[0006] I. Technical problems to be solved This invention addresses the shortcomings of existing technologies and aims to solve the following core technical problems: ① Overcoming the problems of heavy weight, high cost, and difficulty in recycling of aluminum formwork; ② Solving the problems of insufficient strength, poor alkali resistance, weak anti-aging performance, and poor low-temperature stability of existing plastic formwork; ③ Solving the problem of poor compatibility between existing plastic formwork and existing aluminum formwork support systems, requiring additional modification; ④ Providing a building formwork material that combines environmental protection, recyclability, and economy.

[0007] The objectives of this invention are to achieve: ① formwork strength close to that of aluminum film, meeting the requirements for fair-faced concrete pouring; ② significantly reduced weight compared to aluminum film, improving construction convenience; ③ strong resistance to environmental erosion, adapting to different climatic conditions and construction environments; ④ direct compatibility with existing aluminum film support systems, requiring no additional modifications; and ⑤ controllable cost and recyclability. II. Technical Solution

[0008] To achieve the above technical objectives, this invention provides a high-strength plastic building formwork material to replace aluminum foil, comprising a formwork body and a protective coating applied to the casting surface and sides of the formwork body. Its core technical solution is as follows: Template body recipe design

[0009] The template body is made from the following raw materials by melt blending and extrusion molding: 60-75 parts of polycarbonate (PC), 15-25 parts of acrylonitrile-butadiene-styrene copolymer (ABS), 5-15 parts of reinforcing fiber, 2-5 parts of compatibilizer, 1-3 parts of anti-hydrolysis agent, 0.5-2 parts of anti-aging agent, and 0.5-1.5 parts of lubricant.

[0010] The selection criteria and mechanisms of action of each raw material are as follows: (1) Polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS): The two are compounded in a ratio of 60-75 parts: 15-25 parts to form a resin matrix with synergistic rigidity and toughness. Among them, the proportion of PC is higher than that of the prior art (50-65 parts), which can significantly improve the bending strength and rigidity of the template; ABS can improve the impact resistance and processing fluidity of the resin matrix, and avoid the template from being damaged by impact during handling and construction.

[0011] (2) Reinforcing Fibers: One or a mixture of basalt fiber and carbon fiber is selected, preferably a basalt fiber and carbon fiber mixed in a mass ratio of 2:1. This mixing ratio can achieve a balance between strength improvement and cost control: the rigidity improvement effect of single basalt fiber reinforcement is limited, while the cost of single carbon fiber is too high, while the 2:1 mixed reinforcing fibers can significantly improve the bending strength and elastic modulus of the template through synergistic effect. The length of the reinforcing fibers is limited to 3-8mm (preferably 3-5mm) and the diameter is 10-20μm. This size range can ensure that the fibers are uniformly dispersed in the resin matrix and avoid agglomeration; if the fiber length is too long, it will easily lead to entanglement during processing, and if it is too short, it will not be able to play an effective reinforcing role.

[0012] (3) Compatibilizer: Styrene-acrylonitrile-glycidyl methacrylate terpolymer (SAG) is selected, which is different from the maleic anhydride graft compatibilizer commonly used in the prior art. SAG can react with the end groups of PC and ABS through epoxy groups, effectively improving the interfacial compatibility of PC and ABS, solving the phase separation problem when the two resins are blended, and improving the mechanical stability and service life of the template body.

[0013] (4) Anti-hydrolysis agent: Carbodiimide compounds are selected, which can specifically inhibit the hydrolytic degradation reaction of PC in the alkaline environment of concrete and significantly improve the alkali resistance of the formwork; most existing plastic formworks do not have special anti-hydrolysis agents added, which is the core reason for their insufficient alkali resistance.

[0014] (5) Anti-aging agent: It is made by compounding 2-hydroxy-4-n-octyloxybenzophenone (UV-531) and hindered phenolic antioxidant 1010 in a mass ratio of 1:1. Among them, UV-531 can efficiently absorb ultraviolet light and avoid the degradation of the resin matrix by ultraviolet radiation; 1010 can inhibit the oxidative degradation of the template during processing and use. The combination of the two can significantly improve the anti-aging performance of the template.

[0015] (6) Lubricant: Calcium stearate is selected to reduce the viscosity of the melt during processing, improve the smoothness of extrusion molding, and at the same time avoid the raw material from adhering to the equipment, ensuring processing stability. Formulation design of protective coatings

[0016] The protective coating is made by mixing and curing the following raw materials in parts by weight: 1.0-1.5 parts acrylic resin, 0.3-0.5 parts curing agent, 0.5-2.0 parts nano silica, 0.05-0.5 parts carbon dots, and 3.0-6.0 parts solvent.

[0017] The selection criteria and mechanisms of action of each raw material are as follows: (1) Acrylic resin: As the main film-forming agent of the coating, it has good adhesion, weather resistance and alkali resistance, and can form a continuous and dense protective film on the template surface.

[0018] (2) Curing agent: Isocyanate is selected, which can cross-link with the hydroxyl groups of acrylic resin to form a three-dimensional network structure, thereby improving the hardness, wear resistance and adhesion of the coating.

[0019] (3) Nano silica: As a reinforcing filler, it can significantly improve the mechanical strength, scratch resistance and aging resistance of the coating, and prevent the template from being damaged by friction during construction.

[0020] (4) Carbon dots: This is a key innovative component of the present invention, which is not used in existing building template coatings. Carbon dots have excellent UV blocking properties and interfacial bonding ability. After addition, the coating’s UV aging resistance can be significantly improved. After 1000 hours of UV aging, the template impact strength retention rate is ≥85%. At the same time, carbon dots can enhance the interfacial bonding force between the coating and the template body, preventing the coating from peeling off.

[0021] (5) Solvent: Butyl acetate is selected to adjust the viscosity of the coating slurry to a suitable range, ensuring that the coating evenly covers the template surface during the spraying process and avoiding defects such as bubbles and sagging.

[0022] The coating and curing process of the protective coating: The coating thickness is controlled at 0.2-0.8 mm (preferably 0.4-0.6 mm), and high-pressure airless spraying is used for application. The spraying pressure is 15-20 MPa, which ensures the uniformity and density of the coating. The coating is formed by staged curing, specifically: pre-curing at 80℃ for 20 min, and then heating to 100℃ for 20-40 min. Staged curing avoids internal stress caused by rapid curing of the coating, improves the bonding stability between the coating and the template body, and ensures that the coating is fully cured to achieve optimal protective performance. Template structural design

[0023] The template body has an integrally formed reinforcing rib structure and splicing holes on the back that are compatible with the existing aluminum film support system. The reinforcing rib structure includes vertical reinforcing ribs, horizontal reinforcing ribs and edge ring reinforcing ribs.

[0024] The innovative aspects of the structural design are: ① The use of an integrated molding process, which differs from the existing modular reinforcing rib design, can significantly improve the overall rigidity and structural stability of the template, and prevent the modular structure from loosening under stress; ② The spacing and cross-sectional dimensions of the reinforcing ribs are precisely designed according to the interface parameters of the existing aluminum membrane support system. The position and diameter of the splicing holes are perfectly matched with the aluminum membrane, which can be directly compatible with the existing aluminum membrane support system's uprights, crossbars and other components without the need for additional modification of the support system, thus reducing construction conversion costs. Production process

[0025] The production process of the high-strength plastic building formwork material that replaces aluminum film according to the present invention includes the following steps: S1 Raw material pretreatment: Weigh polycarbonate (PC) and acrylonitrile-butadiene-styrene copolymer (ABS) according to the formula, place them in a drying equipment, and dry them at 90-120℃ for 2-4 hours. Control the moisture content of the raw materials to ≤0.05% to remove moisture from the raw materials and avoid the generation of bubbles during melt blending. Weigh reinforcing fiber, compatibilizer, anti-hydrolysis agent, anti-aging agent, and lubricant according to the formula, place them in a high-speed mixer, and mix at high speed for 5-10 minutes until the material is uniform.

[0026] S2 Melt Blending Extrusion: All pretreated raw materials from S1 are added to a twin-screw extruder. A segmented temperature control mode is used to maintain the barrel temperature at 240-270℃. Specific temperature control parameters are: feed section 240-245℃, melting section 255-260℃, homogenization section 265-270℃. The screw speed is adjusted to 240-270 r / min. After the raw materials are fully melted and blended in the barrel, volatiles are removed by negative pressure venting (vacuum degree -0.08~-0.06MPa), and then the mixture is extruded through the die to obtain the billet. Segmented temperature control ensures that the raw materials are fully melted and do not undergo thermal degradation, while negative pressure venting improves the density of the billet.

[0027] S3 Template body processing: The blank obtained in S2 is sent to a calender for calendering, then cooled to room temperature by a cooling and shaping device, and then cut according to the preset specifications (preferably 1220mm×2440mm×15mm); the template body is obtained by processing the back of the blank with a mold to form an integral vertical reinforcing rib, a horizontal reinforcing rib, an edge ring reinforcing rib and splicing holes.

[0028] S4 Protective Coating Application: Weigh acrylic resin, curing agent, nano silica, carbon dots, and solvent according to the specified ratio, and mix them evenly in a mixing device to prepare a coating slurry; filter the coating slurry through a 1000-mesh filter to remove impurities and agglomerated particles; apply the filtered slurry to the casting surface and sides of the template body using a high-pressure airless spraying device; send the coated template into a curing oven and cure it according to a segmented curing process: first pre-curing at 80℃ for 20 minutes, then raising the temperature to 100℃ for 20-40 minutes; after curing, air-cool to room temperature to obtain the finished product. III. Beneficial Effects

[0029] Compared with the prior art, the present invention has the following significant advantages: 1. Excellent strength, can replace aluminum film: Through the synergistic effect of PC-ABS specific ratio, basalt fiber-carbon fiber 2:1 mixed reinforcement system and SAG compatibilizer, the bending strength of the template body reaches 120-150MPa and the elastic modulus is 4500-6000MPa, which is close to the mechanical properties of aluminum film. It can meet the requirements of fair-faced concrete pouring for template flatness and load-bearing capacity.

[0030] 2. Significantly lightweight, improving construction efficiency: The weight of the formwork is reduced by 30%-40% compared to aluminum formwork of the same specifications. The standard 1220mm×2440mm formwork weighs only 14.8-23.8kg, which can be carried by a single person, reducing construction labor costs and improving construction efficiency by 20%-30%.

[0031] 3. Strong resistance to environmental corrosion and long service life: The addition of a special carbodiimide anti-hydrolysis agent and UV-531 / 1010 compound anti-aging agent, combined with a carbon dot modified protective coating, gives the template excellent alkali resistance, anti-aging and low temperature stability: after immersion in an alkaline environment for 30 days, the strength retention rate is ≥90%; after UV aging for 1000 hours, the impact strength retention rate is ≥85%; there is no brittleness at a low temperature of -20℃; and the number of cycles can be reused more than 50 times, which is significantly better than existing plastic templates.

[0032] 4. Good adaptability and reduced construction costs: The integrated reinforcing rib structure on the back of the template and the splicing holes are precisely matched with the existing aluminum film support system, which can directly replace the aluminum film without the need for additional modification of support components; at the same time, the protective coating has good demolding performance, eliminating the need to apply release agent, further reducing construction costs and operation steps.

[0033] 5. Green Economy: The cost of the formwork is only 50%-60% of that of aluminum film, which can significantly reduce construction costs; all components of the formwork are recyclable materials with a recycling rate of over 90%, reducing resource waste and environmental pollution. IV. Description of the attached drawings

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0035] Figure 1 : A schematic diagram of the overall structure of the high-strength plastic building formwork material that replaces aluminum film according to the present invention; Figure 2 : Figure 1 A schematic diagram of the cross-sectional structure (showing the distribution of the protective coating); Figure 3 : Schematic diagram of the reinforcing ribs and splicing hole structure on the back of the template body; In the diagram: 1- Template body, 2- Protective coating, 3- Vertical reinforcing rib, 4- Horizontal reinforcing rib, 5- Edge ring reinforcing rib, 6- Splicing hole, 7- Anchor hole.

[0036] Explanation of reference numerals in the accompanying drawings: The reference numerals in the above drawings are used to identify the names of each component. The drawings are drawn using Visio professional drawing software. The size and proportion of each component in the drawings and the connection relationship must be consistent with the structural design content described in the specification to ensure that the drawings can clearly and accurately reflect the technical solution of the present invention. V. Detailed Implementation Methods

[0037] The present invention will be further described in detail below with reference to specific embodiments so that those skilled in the art can understand it, but the scope of protection of the present invention is not limited to the following embodiments.

[0038] The raw materials used in the embodiments of this invention are all commercially available conventional products: polycarbonate (PC, model 1100) was purchased from Covestro Polymers (China) Co., Ltd.; acrylonitrile-butadiene-styrene copolymer (ABS, model 757K) was purchased from China Petroleum & Chemical Corporation; basalt fiber (3-5 mm in length, 15 μm in diameter) was purchased from Henan Tianlong New Material Co., Ltd.; carbon fiber (3-5 mm in length, 12 μm in diameter) was purchased from Toray (China) Investment Co., Ltd.; compatibilizer (SAG, model XP7000) was purchased from Kumho Petrochemical Co., Ltd., South Korea; anti-hydrolysis agent (carbodiimide, model Stabaxol) P200 was purchased from Lanxess Chemicals (China) Co., Ltd.; anti-aging agents (UV-531, 1010) were purchased from BASF (China) Co., Ltd.; calcium stearate was purchased from Anhui Jinjinle Industrial Co., Ltd.; acrylic resin (model AC-2615) was purchased from Changxing Chemical Industry (China) Co., Ltd.; curing agent (isocyanate, model N3390) was purchased from Wanhua Chemical Group Co., Ltd.; nano silica (model VK-SP30) was purchased from Hangzhou Wanjing New Materials Co., Ltd.; carbon dots (model CDs-01) were purchased from Nanjing Xianfeng Nanomaterials Technology Co., Ltd.; butyl acetate was purchased from Sinopharm Chemical Reagent Co., Ltd. Example 1

[0039] A high-strength plastic building formwork material that can replace aluminum foil has the following formula: Template body raw materials (parts by weight): PC 65 parts, ABS 20 parts, basalt fiber 10 parts, SAG 3 parts, carbodiimide 2 parts, anti-aging agent 1 part (UV-531 and 1010 compounded in a 1:1 ratio), calcium stearate 1 part; Protective coating raw materials (parts by weight): 1.2 parts acrylic resin, 0.4 parts isocyanate, 1.2 parts nano silica, 0.2 parts carbon dots, and 4.5 parts butyl acetate.

[0040] The production process is as follows: S1 Raw material pretreatment: Dry PC and ABS at 100℃ for 3 hours, controlling the moisture content to ≤0.05%; place the remaining raw materials in a high-speed mixer and mix at high speed for 8 minutes until uniform; S2 Melt Blending Extrusion: The pretreated raw material is added to a twin-screw extruder, and the temperature parameters are controlled in stages: feed section 242℃, melting section 258℃, homogenization section 268℃, screw speed 250r / min, and negative pressure exhaust (vacuum degree -0.07MPa) before extrusion to obtain the billet; S3 Template Body Processing: After the blank is calendered, cooled and shaped, it is cut into 1220mm×2440mm×15mm specifications. Vertical reinforcing ribs, horizontal reinforcing ribs, edge ring reinforcing ribs and splicing holes are integrally processed on the back. S4 Protective Coating Application: Prepare the coating slurry according to the formula, filter it through a 1000-mesh filter, and then spray it onto the casting surface and sides of the template body using a high-pressure airless spray at 18MPa. The coating thickness is 0.5mm. Send the coated template into the curing oven, pre-cur it at 80℃ for 20 minutes, then raise the temperature to 100℃ for 45 minutes, and air-cool it to room temperature to obtain the finished product.

[0041] Finished product test results: flexural strength 138MPa, impact strength 28kJ / m², weight 15.2kg (35% lower than aluminum film of the same specification); yellowing index 1.8 after 1000h UV aging, strength retention rate 92% after 30d alkaline immersion; no brittleness at -20℃; after 55 cycles of use, the surface showed no obvious damage, and the flatness met the requirements for fair-faced concrete pouring. Example 2

[0042] A high-strength plastic building formwork material that can replace aluminum foil has the following formula: Template body raw materials (parts by weight): PC 70 parts, ABS 18 parts, carbon fiber 8 parts, SAG 4 parts, carbodiimide 1.5 parts, anti-aging agent 1.2 parts (UV-531 and 1010 compounded in a 1:1 ratio), calcium stearate 0.8 parts; Protective coating raw materials (parts by weight): 1.4 parts acrylic resin, 0.45 parts isocyanate, 1.5 parts nano silica, 0.3 parts carbon dots, and 5 parts butyl acetate.

[0043] Production process: Steps S1-S3 are the same as in Example 1, except that the temperature control parameters of the twin-screw extruder in S2 are adjusted to: 245°C for the feeding section, 260°C for the melting section, and 270°C for the homogenization section; in S4, the coating thickness is 0.6 mm, and the curing process is adjusted to pre-curing at 80°C for 20 min and curing at 95°C for 35 min.

[0044] Finished product test results: bending strength 145MPa, impact strength 26kJ / m², weight 15.6kg (32% lower than aluminum film of the same specification); yellowing index 1.5 after 1000h UV aging, strength retention rate 94% after 30d alkaline immersion; no brittleness at -20℃ low temperature; performance still meets construction requirements after 60 cycles of use. Example 3

[0045] A high-strength plastic building formwork material that can replace aluminum foil has the following formula: Template body raw materials (parts by weight): PC 60 parts, ABS 25 parts, basalt fiber-carbon fiber (2:1) 12 parts, SAG 2 parts, carbodiimide 2.5 parts, anti-aging agent 0.8 parts (UV-531 and 1010 compounded in 1:1 ratio), calcium stearate 1.2 parts; Protective coating raw materials (parts by weight): 1.1 parts acrylic resin, 0.35 parts isocyanate, 0.8 parts nano silica, 0.1 parts carbon dots, and 4 parts butyl acetate.

[0046] Production process: Steps S1-S3 are the same as in Example 1, except that the temperature control parameters of the twin-screw extruder in S2 are adjusted to: 240°C for the feeding section, 255°C for the melting section, and 265°C for the homogenization section; and the coating thickness in S4 is 0.4 mm.

[0047] Finished product test results: bending strength 132MPa, impact strength 30kJ / m², weight 14.8kg (38% lower than aluminum film of the same specification); yellowing index 2.0 after 1000h UV aging, strength retention rate 90% after 30d alkaline immersion; no cracking at -20℃ low temperature; performance meets construction requirements after 52 cycles of use.

Claims

1. A high-strength plastic building formwork material to replace aluminum foil, characterized in that, Includes the template body and a protective coating applied to the casting surface and sides of the template body; The template body is made from the following raw materials by melt blending and extrusion molding in parts by weight: 60-75 parts polycarbonate, 15-25 parts acrylonitrile-butadiene-styrene copolymer, 5-15 parts reinforcing fiber, 2-5 parts compatibilizer, 1-3 parts anti-hydrolysis agent, 0.5-2 parts anti-aging agent, and 0.5-1.5 parts lubricant. The protective coating is made by mixing and curing the following raw materials in parts by weight: 1.0-1.5 parts acrylic resin, 0.3-0.5 parts curing agent, 0.5-2.0 parts nano silica, 0.05-0.5 parts carbon dots, and 3.0-6.0 parts solvent; The template body has an integrally formed reinforcing rib structure and splicing holes on the back that are compatible with the existing aluminum film support system. The reinforcing rib structure includes vertical reinforcing ribs, horizontal reinforcing ribs and edge ring reinforcing ribs.

2. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The reinforcing fiber is one or a mixture of two of basalt fiber and carbon fiber, and the length of the reinforcing fiber is 3-8 mm and the diameter is 10-20 μm.

3. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 2, characterized in that, The reinforcing fiber is a mixture of basalt fiber and carbon fiber in a mass ratio of 2:

1.

4. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The compatibilizer is a terpolymer of styrene-acrylonitrile-glycidyl methacrylate; the anti-hydrolysis agent is a carbodiimide compound; and the anti-aging agent is a mixture of 2-hydroxy-4-n-octyloxybenzophenone and hindered phenolic antioxidant 1010 in a mass ratio of 1:

1.

5. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The lubricant is calcium stearate; the solvent is butyl acetate; and the curing agent is isocyanate.

6. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The protective coating has a thickness of 0.4-0.6 mm and is applied using a high-pressure airless spraying method with a pressure of 15-20 MPa, followed by segmented curing. The segmented curing process is as follows: first, pre-curing at 80℃ for 20 min, and then heating to 100℃ for 20-40 min.

7. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The template body has dimensions of 1220mm×2440mm×15mm, and its weight is reduced by 30%-40% compared to aluminum film of the same specifications. Its bending strength is 120-150MPa and its elastic modulus is 4500-6000MPa.

8. The high-strength plastic building formwork material as an alternative to aluminum film according to claim 1, characterized in that, The template body retains ≥90% of its strength after being soaked in an alkaline environment for 30 days, retains ≥85% of its impact strength after being aged under ultraviolet light for 1000 hours, shows no brittleness at -20℃, and can be recycled ≥50 times.

9. A production process for a high-strength plastic building formwork material as an alternative to aluminum film according to any one of claims 1-8, characterized in that, Includes the following steps: S1 Raw material pretreatment: Weigh polycarbonate and acrylonitrile-butadiene-styrene copolymer according to the formula, dry them at 90-120℃ for 2-4 hours until the moisture content is ≤0.05%, and then mix the dried polycarbonate and acrylonitrile-butadiene-styrene copolymer with reinforcing fiber, compatibilizer, anti-hydrolysis agent, anti-aging agent and lubricant at high speed for 5-10 minutes until uniform; S2 Melt Blending Extrusion: The raw materials that are uniformly mixed in S1 are added to a twin-screw extruder and melt-blended under segmented temperature control of 240-270℃ and screw speed of 240-270r / min. After being vented by negative pressure, the raw material is extruded to obtain a preform. S3 Template Body Processing: After the blank obtained in S2 is calendered, cooled and shaped, it is cut to form an integral vertical reinforcing rib, horizontal reinforcing rib, edge ring reinforcing rib and splicing hole on the back of the blank; S4 Protective Coating Application: The coating slurry is prepared by mixing acrylic resin, curing agent, nano silica, carbon dots and solvent according to the formula. After being filtered through a 1000-mesh filter, it is applied to the casting surface and sides of the template body by high-pressure airless spraying. After segmented curing, it is air-cooled to room temperature to obtain the finished product.

10. The production process according to claim 9, characterized in that, The segmented temperature control parameters of the twin-screw extruder are: 240-245℃ for the feeding section, 255-260℃ for the melting section, and 265-270℃ for the homogenization section; the vacuum degree of the negative pressure exhaust is -0.08~-0.06MPa.

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