Environmentally friendly building template material and preparation method thereof

Abstract

The present invention belongs to the field of composite material technology, and particularly relates to an environmentally friendly formwork material for construction and a preparation method thereof. The composite material primarily comprises the following components, by weight: 55-65 parts high-viscosity polypropylene, 10-20 parts low-viscosity polypropylene, 8-14 parts carbon fiber, 3-6 parts hollow glass microspheres, and 2-5 parts nano-silica; the nano-silica has a particle size of 100-500 nm. The carbon fiber, nano-silica, and hollow glass microspheres are simultaneously introduced into a polypropylene-based composite material, leveraging the excellent reinforcement and toughening effects of the carbon fiber and the effective filling effects of the nano-silica and hollow glass microspheres. The composite material has few voids, a high density, and the advantages of high tensile strength, good toughness, and high bearing strength, with broad application prospects.

Description

Technical Field

[0001] The present invention belongs to the technical field of composite materials, and in particular relates to an environmentally friendly building template material and a preparation method thereof. Background Art

[0002] Construction formwork primarily includes plywood, metal, and plastic formwork. Plywood formwork primarily consists of wood plywood and bamboo plywood. This type of formwork offers large dimensions, flexible on-site fabrication, and the ability to accommodate concrete pours of various flat surfaces. Its high strength-to-weight ratio makes it one of the most widely used forms in formwork projects both domestically and internationally. However, plywood formwork has a limited number of reusable cycles, a low recycling rate, and a significant waste of timber resources, making it unsuitable for my country's current forest scarcity.

[0003] Metal formwork includes steel and aluminum alloy formwork. Steel formwork is complex to manufacture, and steel production can cause some environmental pollution, limiting its use. Compared to steel formwork, aluminum alloy formwork is lighter and can be manually transported, reducing the need for cranes during construction. It also offers a higher turnover rate and lower average cost. However, aluminum alloy formwork requires a higher level of technical expertise from installers and requires a larger initial investment, making it particularly effective only in large-scale, multi-story projects or super-high-rise buildings. It is not currently suitable for non-standard floors such as basements and transfer floors, or in corrosive environments such as high salt concentrations. Therefore, widespread adoption of aluminum alloy formwork is still a long way off. With the development of society, the construction industry is inevitably placing higher and more comprehensive demands on formwork materials. With dwindling natural resources, the key future development direction of the composite materials industry is the development of composite materials by combining and combining low-quality raw materials to produce high-performance materials. In recent years, the research and application of resin composite materials for architectural formwork has begun to gain significant attention.

[0004] Resins possess numerous excellent properties, such as low density, extreme plasticity and ductility, and excellent electrical insulation, enabling their widespread application in a wide range of fields, intimately connected to people's lives. Resins are more corrosion-resistant than metals and can be used in various corrosive construction environments. Among these, non-polar polyethylene, polypropylene, and low-polarity polyvinyl chloride (PVC) provide composite surfaces with an inert surface, making them less likely to adhere to concrete. These materials are expected to find widespread use in the construction formwork industry, significantly contributing to my country's efforts to alleviate the challenges of forest resource constraints and environmental pollution caused by discarded plastics.

[0005] Polypropylene is a general-purpose thermoplastic obtained by polymerizing propylene. As a solid, polypropylene is colorless and translucent, non-toxic, and odorless. Its relatively regular molecular structure allows for easy crystallization, with a high degree of crystallization, resulting in a relatively high melting point (approximately 167°C). However, compared to polar resins such as polyamide, polypropylene suffers from low mechanical strength and poor impact resistance, limiting its application in building formwork. Existing technologies improve the performance of polypropylene composites by adding inorganic reinforcing fillers. While this improves the mechanical strength of polypropylene composites to a certain extent, it is often accompanied by a decrease in impact toughness. Therefore, how to further enhance the toughness of polypropylene, while also improving its mechanical strength, has become an urgent challenge for polypropylene composites used in building formwork. Summary of the Invention

[0006] In order to solve the technical problem of the difficulty in achieving both strength and toughness of existing polypropylene materials mentioned in the background art, the present invention provides an environmentally friendly building formwork material, which comprises the following components in parts by weight:

[0007] 55-65 parts high-viscosity polypropylene, 10-20 parts low-viscosity polypropylene, 8-14 parts carbon fibers, 3-6 parts hollow glass microspheres, and 2-5 parts nano-silica; the nano-silica particle size is 100-500 nm. The nano-silica particle size can be any value between 100-500 nm, specifically 100 nm, 150 nm, 200 nm, 250 nm, 300 nm, 350 nm, 400 nm, 450 nm, 500 nm, etc. In particular, the nano-silica particle size is 200-300 nm. The appropriate particle size can enhance and promote volume matching between fillers.

[0008] The present invention achieves the desired performance by compounding polypropylene resins with different viscosities under a specific ratio of composite reinforcing fillers. When a low-viscosity polypropylene resin is used alone or in a high amount, the impact resistance of the polypropylene material decreases, the toughness is insufficient, and due to insufficient viscosity, the inorganic filler cannot be tightly connected, resulting in reduced uniformity inside the composite material and easily causing stress concentration. When a high-viscosity polypropylene resin is used alone or in a high amount, the polypropylene material has insufficient fluidity during processing and the filler is unevenly dispersed, which also affects the mechanical properties of the polypropylene composite material.

[0009] At the same time, the composite reinforcing filler of the present invention is composed of nano-scale silica, hollow glass microspheres and carbon fibers. Nano-scale silica is a nano-scale filler, while glass microspheres and carbon fibers are both common micron-scale fillers in the art.

[0010] Among them, the diameter of carbon fibers is generally around 5-10μm, while the diameter of hollow glass microspheres is usually between 30-100μm. Among the above-mentioned inorganic fillers, the medium-diameter carbon fibers play the role of skeleton reinforcement and load transfer, while the polypropylene resin matrix acts as a connecting fiber, which can transmit and disperse the stress, withstand tensile and compressive loads perpendicular to the fibers, and protect the fibers from damage. The volume average particle size D50 of nano-silica is 100-500nm. If the diameter is too large, it cannot play the role of rigid particle reinforcement; if the diameter is too small, it may not only face the problem of difficult dispersion, but also cannot form a volume matching effect with the large-particle hollow glass microspheres and medium-diameter carbon fibers, and cannot form a uniform and dense structure, and cannot effectively absorb impact energy, which is not conducive to improving toughness.

[0011] The present invention selects carbon fiber because, compared with high-rigidity fibers such as glass fiber, carbon fiber has good flexibility and is more likely to undergo elastic deformation during the blending process with glass microspheres and nano-silica, thereby promoting uniformity of filler dispersion.

[0012] The present invention simultaneously introduces carbon fibers, small-particle silica, and large-particle hollow glass microspheres into a polypropylene-based composite material, leveraging the excellent reinforcing and toughening effects of the carbon fibers and the effective filling effects of the small-particle silica and large-particle hollow glass microspheres. The resulting multi-scale carbon fiber-polypropylene composite material exhibits excellent performance, with the fibers, small-particle silica, and large-particle hollow glass microspheres tightly bonded to the polypropylene matrix. The composite material exhibits few voids, a high density, and the advantages of high tensile strength, good toughness, and high bearing strength. The carbon fibers, small-particle silica, and large-particle hollow glass microspheres form a multi-scale composite reinforcement skeleton. The large-particle hollow glass microspheres are dispersed in a skeleton network formed by a resin matrix and carbon fibers, and their spherical structure helps disperse residual stress on the carbon fibers. The small-particle silica fills the gaps between the glass microspheres and the carbon fibers, creating a rolling effect that further disperses the stress on the matrix while improving the uniformity of the composite material's density and preventing stress concentration. In general, the stress transfer between fibers, small-particle silica, and large-particle hollow glass microspheres is beneficial to dispersing stress concentration points, thereby achieving the purpose of synergistic reinforcement and toughening, and improving the toughness and strength of the composite material.

[0013] Particularly, the high-viscosity polypropylene has a melt index of 5-10 g / 10 min at 230° C. / 2.16 kg, and specifically, can be 5 g / 10 min, 6 g / 10 min, 7 g / 10 min, 8 g / 10 min, 9 g / 10 min, 10 g / 10 min, etc.

[0014] Particularly, the low-viscosity polypropylene has a melt index of 20-50 g / 10 min at 230° C. / 2.16 kg, and specifically, can be 20 g / 10 min, 25 g / 10 min, 30 g / 10 min, 35 g / 10 min, 40 g / 10 min, 45 g / 10 min, 50 g / 10 min, etc.

[0015] By compounding polypropylene resins of varying viscosities, it is possible to balance filler bonding and dispersion properties, improving the mechanical strength of the composite material. Furthermore, 57-62 parts of high-viscosity polypropylene and 13-16 parts of low-viscosity polypropylene are used. An appropriate amount of low-viscosity polypropylene can achieve both dispersing and reinforcing effects. Too little can reduce melt flowability and affect processing performance. Too much, due to the low density and "floating" nature of the hollow microspheres, can lead to uneven dispersion of the hollow microspheres, compromising the mechanical properties of the product.

[0016] Specifically, the carbon fibers are chopped short carbon fibers with a diameter of 5-10 μm. The carbon fiber type is not particularly limited, and polyacrylonitrile-based carbon fibers, pitch-based carbon fibers, or rayon-based carbon fibers are all acceptable. The present invention utilizes the volume matching effect between fillers to improve the dispersion of inorganic materials in polypropylene, eliminating the need for complex carbon fiber modification and simplifying the process.

[0017] In particular, the particle size of the hollow glass microspheres is 30-100μm, specifically, 30μm, 40μm, 50μm, 60μm, 70μm, 80μm, 90μm, 100μm, etc. The wall thickness of the hollow glass microspheres is not particularly limited, and is generally between 0.5-2μm. The interior of the hollow glass microspheres is hollow. When used in the construction industry, they not only do not add extra burden to the building structure, but also reduce the possibility of leakage due to excessive structural load. The addition of hollow microspheres will not only reduce the density of the matrix, but also increase the stiffness, strength and dimensional stability of the matrix. Since hollow glass microspheres are tiny spheres, they have better fluidity in the resin than linear carbon fiber fillers, so they have excellent mold filling performance. More importantly, these small microspheres are isotropic, so there will be no disadvantages of inconsistent shrinkage rates in different parts due to orientation, ensuring the dimensional stability of the product and no warping.

[0018] Particularly, the environmentally friendly building formwork material further comprises an additive.

[0019] Particularly, the auxiliary agent is at least one of an interfacial compatibilizer, a coupling agent, a lubricant, an antioxidant, a flow modifier, and a colorant.

[0020] Particularly, the interfacial compatibilizer is selected from at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and maleic anhydride grafted ethylene-octene copolymer.

[0021] Specifically, the coupling agent is selected from at least one of a titanate coupling agent, a silane coupling agent, and an aluminate coupling agent; the lubricant is selected from at least one of zinc stearate, paraffin wax, ethylene bisstearamide, modified ethylene bisstearamide, silicone powder, polyethylene wax, polysiloxane, amide wax, oleamide, and erucamide; and the antioxidant is selected from at least one of a hindered phenol antioxidant and a phosphite antioxidant. The types of flow modifiers and colorants are not particularly limited and may be any common type in the art.

[0022] On the other hand, the present invention also provides a method for preparing an environmentally friendly building formwork material, comprising the following steps:

[0023] The components are weighed according to the ratio and fed into a twin-screw extruder through the main feed port. Carbon fiber is then fed into the twin-screw extruder through the side feed port. The extruder is melt-extruded and pelletized to produce an environmentally friendly building formwork material. While the extruder process parameters are not specifically limited, the extrusion temperature can be controlled between 170-220°C and the screw speed can be controlled between 100-600 rpm.

[0024] Beneficial effects:

[0025] Compared with existing technologies, the environmentally friendly formwork material for construction provided by the present invention has an inert composite surface and is not easy to adhere to concrete, which can greatly meet the performance requirements of the main material for concrete casting. The resin composite material has high strength, high toughness, and excellent comprehensive performance, and can be widely used in the field of construction formwork. DETAILED DESCRIPTION

[0026] The technical solution of the present invention is further described below by way of specific embodiments. It should be understood by those skilled in the art that the embodiments are merely to help understand the present invention and should not be regarded as specific limitations of the present invention.

[0027] Unless otherwise specified, the materials used in the present invention are of the same type and can be purchased commercially or prepared using conventional methods.

[0028] In particular, the types of raw material components in the examples and comparative examples are consistent, and the specific components are:

[0029] The high-viscosity polypropylene has a melt index of 8 g / 10 min at 230°C / 2.16 kg; the low-viscosity polypropylene has a melt index of 30 g / 10 min at 230°C / 2.16 kg; the carbon fiber is chopped carbon fiber with a length of 6 mm and a diameter of 8 μm; the hollow glass microspheres have a particle size of 50 μm and a wall thickness of 1 μm.

[0030] The preparation methods of the following examples and comparative examples are all the same, specifically comprising the following steps:

[0031] The components were weighed according to the ratio, and high-viscosity polypropylene, low-viscosity polypropylene, hollow glass microspheres, nano-silica, and additives were added to the twin-screw extruder through the main feeding port; carbon fiber was added to the twin-screw extruder through the side feeding port, melt-extruded and granulated to obtain the environmentally friendly formwork material for construction; the extrusion temperature was 200°C and the screw speed was 200 r / min.

[0032] Example 1

[0033] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0034] 55 parts of high-viscosity polypropylene, 13 parts of low-viscosity polypropylene, 8 parts of carbon fibers, 3 parts of hollow glass microspheres, 2 parts of nano-silica, 1 part of an interfacial compatibilizer, 1 part of a coupling agent, 0.2 parts of a lubricant, and 0.5 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 100 nm; the interfacial compatibilizer is maleic anhydride-grafted polyethylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0035] Example 2

[0036] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0037] 65 parts of high-viscosity polypropylene, 16 parts of low-viscosity polypropylene, 14 parts of carbon fibers, 6 parts of hollow glass microspheres, 5 parts of nano-silica, 3 parts of an interfacial compatibilizer, 2 parts of a coupling agent, 1 part of a lubricant, and 1 part of an antioxidant 1010; the nano-silica has a volume average particle size of 300 nm; the interfacial compatibilizer is maleic anhydride-grafted polypropylene; the coupling agent is KH560; and the lubricant is paraffin.

[0038] Example 3

[0039] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0040] 58 parts of high-viscosity polypropylene, 10 parts of low-viscosity polypropylene, 12.5 parts of carbon fibers, 4.5 parts of hollow glass microspheres, 3.5 parts of nano-silica, 1.2 parts of an interfacial compatibilizer, 1.4 parts of a coupling agent, 1 part of a lubricant, and 0.7 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride-grafted polyethylene; the coupling agent is KH570; and the lubricant is ethylene bisstearamide.

[0041] Example 4

[0042] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0043] 55 parts of high-viscosity polypropylene, 16 parts of low-viscosity polypropylene, 8 parts of carbon fibers, 6 parts of hollow glass microspheres, 2 parts of nano-silica, 3 parts of an interfacial compatibilizer, 1 part of a coupling agent, 1 part of a lubricant, and 0.5 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 300 nm; the interfacial compatibilizer is maleic anhydride grafted ethylene-octene copolymer; the coupling agent is KH570; and the lubricant is polyethylene wax.

[0044] Example 5

[0045] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0046] 60 parts of high-viscosity polypropylene, 20 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 5 parts of hollow glass microspheres, 4 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0047] Example 6

[0048] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0049] 57 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 10 parts of carbon fibers, 4 parts of hollow glass microspheres, 3 parts of nano-silica, 1.5 parts of an interfacial compatibilizer, 1.3 parts of a coupling agent, 0.6 parts of a lubricant, and 0.6 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 100 nm; the interfacial compatibilizer is maleic anhydride-grafted polyethylene; the coupling agent is KH550; and the lubricant is ethylene bisstearamide.

[0050] Example 7

[0051] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0052] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 5 parts of hollow glass microspheres, 4 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 500 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0053] Example 8

[0054] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0055] 62 parts of high-viscosity polypropylene, 15 parts of low-viscosity polypropylene, 13 parts of carbon fibers, 5 parts of hollow glass microspheres, 4 parts of nano-silica, 2.5 parts of an interfacial compatibilizer, 1.8 parts of a coupling agent, 0.8 parts of a lubricant, and 0.9 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 300 nm; the interfacial compatibilizer is maleic anhydride-grafted polyethylene; the coupling agent is KH560; and the lubricant is zinc stearate.

[0056] Example 9

[0057] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0058] 59 parts of high-viscosity polypropylene, 15 parts of low-viscosity polypropylene, 11 parts of carbon fibers, 4.5 parts of hollow glass microspheres, 3.5 parts of nano-silica, 1.8 parts of an interfacial compatibilizer, 1.3 parts of a coupling agent, 0.5 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 100 nm; the interfacial compatibilizer is maleic anhydride-grafted polypropylene; the coupling agent is KH570; and the lubricant is paraffin.

[0059] Example 10

[0060] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0061] 64 parts of high-viscosity polypropylene, 15 parts of low-viscosity polypropylene, 10 parts of carbon fibers, 5.5 parts of hollow glass microspheres, 4.5 parts of nano-silica, 2.2 parts of an interfacial compatibilizer, 1.2 parts of a coupling agent, 0.6 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 300 nm; the interfacial compatibilizer is maleic anhydride grafted ethylene-octene copolymer; the coupling agent is KH550; and the lubricant is polyethylene wax.

[0062] Example 11

[0063] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0064] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 5 parts of hollow glass microspheres, 4 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0065] Comparative Example 1

[0066] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0067] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 0 parts of hollow glass microspheres, 9 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0068] Comparative Example 2

[0069] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0070] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 9 parts of hollow glass microspheres, 0 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0071] Comparative Example 3

[0072] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0073] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 5 parts of hollow glass microspheres, 4 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 50 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0074] Comparative Example 4

[0075] An environmentally friendly building formwork material, comprising the following components in parts by weight:

[0076] 60 parts of high-viscosity polypropylene, 14 parts of low-viscosity polypropylene, 12 parts of carbon fibers, 5 parts of hollow glass microspheres, 8 parts of nano-silica, 2.1 parts of an interfacial compatibilizer, 1.6 parts of a coupling agent, 0.7 parts of a lubricant, and 0.8 parts of an antioxidant 1010; the nano-silica has a volume average particle size of 200 nm; the interfacial compatibilizer is maleic anhydride grafted polypropylene; the coupling agent is KH550; and the lubricant is zinc stearate.

[0077] Performance testing:

[0078] The materials prepared in Examples 1-11 and Comparative Examples 1-4 were injection molded into standard specimens. Under the same test conditions, their mechanical properties, including tensile strength (specifically referring to ASTM D638), flexural strength in MPa (specifically referring to ASTM D790), and notched impact strength (specifically referring to ISO 179), were tested. The test results are shown in Tables 1-2 below.

[0079] Table 1

[0080]

[0081] Table 2

[0082]

[0083] It can be seen from the data in Tables 1 and 2 that the simultaneous introduction of carbon fibers, nano-silica and hollow glass microspheres in a specific ratio into polypropylene-based composite materials can bring into play the good reinforcement and toughening effects of carbon fibers and the effective filling effects of small-particle silica and large-particle glass microspheres. The stress transfer between the three is conducive to dispersing stress concentration points, thereby achieving the purpose of synergistic reinforcement and toughening.

[0084] Compared with Example 11, Comparative Examples 1-2 lack nano-silica or hollow glass microspheres, respectively, and cannot effectively form a multi-scale composite reinforced skeleton, resulting in poor uniformity of the composite material, and reduced impact toughness and mechanical strength. As can be seen from Comparative Example 3, when the nano-silica particle size is too small, it is not only likely to face the problem of difficulty in self-dispersion, but also unable to form a volume matching effect with large-particle hollow glass microspheres and medium-diameter carbon fibers, and cannot form a uniform density structure, and cannot effectively absorb impact energy. Although the tensile strength and flexural strength do not change much, the impact toughness is greatly reduced. As can be seen from Comparative Example 4, when the nano-silica dosage is too much, due to being difficult to disperse and causing excessive filling, the tensile strength has only a slight change, while the impact strength is greatly reduced, which is not conducive to the improvement of mechanical properties.

[0085] The above description of the embodiments is intended to facilitate understanding and application of the present invention by those skilled in the art. It will be apparent that those skilled in the art can readily make various modifications to the embodiments and apply the general principles of this description to other embodiments without requiring creative effort. Therefore, the present invention is not limited to the embodiments described herein. Improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the present invention should be within the scope of protection of the present invention.

Claims

1. An environmentally friendly formwork material for construction, characterized in that: In parts by weight, it comprises the following components: 55-65 parts of high-viscosity polypropylene, 10-20 parts of low-viscosity polypropylene, 8-14 parts of carbon fibers, 3-6 parts of hollow glass microspheres, and 2-5 parts of nano-silicon dioxide; the nano-silicon dioxide has a particle size of 100-500 nm; The high-viscosity polypropylene has a melt index of 5-10 g / 10 min at 230° C. / 2.16 kg; the low-viscosity polypropylene has a melt index of 20-50 g / 10 min at 230° C. / 2.16 kg; the carbon fiber is chopped carbon fiber with a diameter of 5-10 μm; and the hollow glass microspheres have a particle size of 30-100 μm.

2. The environmentally friendly building template material according to claim 1, characterized in that: The environmentally friendly building template material further comprises an auxiliary agent.

3. The environmentally friendly building formwork material according to claim 2, wherein: The auxiliary agent is at least one of an interfacial compatibilizer, a coupling agent, a lubricant, an antioxidant, a flow modifier, and a colorant.

4. The environmentally friendly building formwork material according to claim 3, wherein: The interfacial compatibilizer is selected from at least one of maleic anhydride grafted polyethylene, maleic anhydride grafted polypropylene, and maleic anhydride grafted ethylene-octene copolymer.

5. The environmentally friendly building formwork material according to claim 3, characterized in that: The coupling agent is selected from at least one of titanate coupling agents, silane coupling agents, and aluminate coupling agents; the lubricant is selected from at least one of zinc stearate, paraffin, ethylene bisstearamide, modified ethylene bisstearamide, silicone powder, polyethylene wax, polysiloxane, amide wax, oleamide, and erucamide; and the antioxidant is selected from at least one of hindered phenol antioxidants and phosphite antioxidants.

6. The method for preparing an environmentally friendly building formwork material according to claim 1, characterized in that: The following steps are involved: The components are weighed according to the ratio, and high-viscosity polypropylene, low-viscosity polypropylene, hollow glass microspheres, and nano-silica are added to the twin-screw extruder through the main feeding port; carbon fiber is added to the twin-screw extruder through the side feeding port, and melt-extruded into granules to obtain the environmentally friendly template material for construction.

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