Novel green building template and manufacturing method thereof

Abstract

The invention relates to the technical field of constructional engineering, and discloses a novel environment-friendly construction formwork and a manufacturing method thereof.The novel environment-friendly construction formwork comprises a formwork body; the template main body is made of a recyclable environment-friendly material; the hollow cavities are uniformly distributed in the template main body and are used for reducing the weight and improving the bending strength; the reinforcing ribs are arranged between the hollow cavities and are used for enhancing the bearing capacity of the template main body; compared with a traditional hollow plastic template, the novel green building template has the advantages that the hollow plastic template is made of pure new plastic polypropylene and is not reinforced by fibers, and in the technology, through regenerated plastic, bamboo wood and basalt fibers, waste plastic can be recycled, natural fibers can be obtained, cyclic utilization of resources is achieved, the novel green building template is more environmentally friendly and conforms to green building certification, and the novel green building template is worthy of popularization and application. Meanwhile, through the hollow cavities, the reinforcing ribs and the bionic honeycomb structure, the bending strength is improved by 40%, the waterborne polyurethane coating and the basalt fibers are embedded and matched, and compared with a hollow plastic formwork coated with a fireproof agent, integrated fireproof and waterproof effects are achieved, and the durability is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, in particular to a novel green construction template and a manufacturing method thereof. Background Art

[0002] In the field of construction, building formwork is an indispensable and important tool in the concrete pouring process, which directly affects the shape and structural quality of the building. Traditional building formwork mainly uses materials such as wood and steel;

[0003] Traditional wooden formwork is difficult to recycle after use, resulting in a large amount of wood waste and environmental damage. With the improvement of environmental awareness and the deepening of the concept of sustainable development, higher environmental protection requirements are put forward for building materials;

[0004] Traditional wooden formwork uses wood as its primary material, which has poor renewability. Deforesting wood damages the ecosystem and fails to meet the environmental and sustainability requirements of modern construction. Furthermore, the formwork easily absorbs water and deforms during use, affecting the precision and structural quality of concrete pouring. Wood has a strong water absorption capacity and easily absorbs moisture from the air, causing the formwork to deform and swell, affecting the concrete pouring effect and structural quality. Furthermore, existing hollow plastic formwork is mostly made of pure new plastic, which is non-degradable and has a low recyclability, making it difficult to achieve good environmental protection. Therefore, we propose a new green construction formwork and its manufacturing method to address the above-mentioned problems. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the present invention provides a new green construction template and its manufacturing method, which solves the problems of poor environmental protection, water absorption and deformation, short service life and low reuse rate of traditional wooden templates.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions: a new type of green construction template and a manufacturing method thereof, comprising a template body;

[0007] The template body is made of recyclable environmentally friendly materials;

[0008] Hollow cavities, evenly distributed within the template body, for reducing weight and increasing bending strength;

[0009] Reinforcement ribs are provided between the hollow cavities to enhance the load-bearing capacity of the formwork body;

[0010] The waterproof layer is applied on the surface of the template body.

[0011] Preferably, the recyclable environmentally friendly materials include recycled plastics and bamboo.

[0012] Preferably, the cross-sectional shape of the hollow cavity is circular, rectangular, square, triangular or hexagonal.

[0013] Preferably, the reinforcing ribs are designed in a crisscross structure and have a thickness of 3-8 mm.

[0014] Preferably, the recycled plastic may be polypropylene or high-density polyethylene, accounting for 50%-70% of the total mass of the template body.

[0015] Preferably, the bamboo material can be bamboo fiber, which accounts for 30%-50% of the total mass of the template body.

[0016] Preferably, the reinforcing ribs are made of composite materials.

[0017] Preferably, the composite material comprises recycled plastic and basalt fiber, the recycled plastic accounts for 75%-85% of the total mass of the composite material, the basalt fiber accounts for 15%-25% of the total mass of the composite material, and the density of the template body is 0.6-1.2 g / cm3.

[0018] Preferably, the waterproof layer can be made of water-based polyurethane coatings, which can form a waterproof film on the surface of the template body.

[0019] The present invention provides a novel green construction template and a manufacturing method thereof;

[0020] S1, will use recycled polypropylene PP or high-density polyethylene HDPE, crush and clean it and then granulate it, the particle size is controlled at 3-5mm;

[0021] S2, remove impurities and perform melt filtration;

[0022] S3, adding 2%-5% compatibilizer, the compatibilizer is maleic anhydride grafted polyethylene;

[0023] S4, processing bamboo into bamboo fiber, soaking it in 4% NaOH solution for 24 hours, washing it with water until it is neutral, drying it at 80°C until the moisture content is less than 3%, and spraying it with 1% to 3% silane coupling agent ethanol solution to improve its hydrophobicity;

[0024] S5. Mix 50%-70% of recycled plastic and 30%-50% of bamboo fiber in a mass ratio, melt-blend and granulate through a twin-screw extruder;

[0025] S6. Use a high-speed mixer at a speed of 800-1200 rpm for 5-10 minutes to ensure that the particle fibers are evenly dispersed;

[0026] S7, using a twin-screw extruder, with the temperature stepwise: 160°C → 180°C → 190°C → 170°C, melt blending, extrusion and pelletizing;

[0027] S8. The composite material of the reinforcement rib is mixed with 75%-85% of recycled plastic and 15%-25% of basalt fiber according to the mass ratio, and granulated for later use;

[0028] S9, using the same manufacturing process as S6 and S7, but with the melting temperature increased by 10°C;

[0029] S10, using an injection molding or hot pressing process, placing evenly distributed hollow cavity mold bodies and crisscross reinforcing ribs in a mold, and performing injection molding;

[0030] S11. Apply water-based polyurethane waterproof coating on the surface of the formwork to form a waterproof layer

[0031] S12. Trim and polish the main body of the formed formwork, and conduct tests on its mechanical properties, waterproofness and fire rating.

[0032] Beneficial effects

[0033] The present invention provides a new green construction template and its manufacturing method. Compared with the existing technology, it has the following advantages:

[0034] Compared with traditional hollow plastic formwork, this new green building formwork is made of pure new plastic polypropylene without fiber reinforcement. In this technology, recycled plastic, bamboo and basalt fiber can recycle waste plastic and natural fiber to achieve resource recycling, making it more environmentally friendly and compliant with green building certification. At the same time, the hollow cavity and reinforcement ribs, bionic honeycomb structure, increase the bending strength by 40%, and the water-based polyurethane coating and basalt fiber are embedded in the formwork. Compared with the hollow plastic formwork coated with fire retardant, it is integrated fireproof and waterproof, and its durability is improved.

[0035] Compared with wooden formwork, which damages the ecology by cutting down wood, this technical solution uses waste plastic and fast-growing bamboo for sustainable supply, protects forest resources, and reduces soil erosion. At the same time, wooden formwork easily absorbs water and expands, while the main body of this formwork has a water absorption rate of ≤3%, has its own waterproof layer, and will not deform in a humid environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2 It is a partial cross-sectional view of the overall structure of the present invention.

[0038] In the figure: 101, formwork body; 102, hollow cavity; 103, reinforcing ribs; 104, waterproof layer. DETAILED DESCRIPTION

[0039] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0040] like Figure 1-2 As shown:

[0041] A novel green construction template and a manufacturing method thereof, comprising a template body 101;

[0042] The template body 101 is made of recyclable and environmentally friendly materials, including recycled plastics and bamboo. The recycled plastics can be polypropylene or high-density polyethylene, accounting for 50%-70% of the total mass of the template body 101. The bamboo can be bamboo fiber, accounting for 30%-50% of the total mass of the template body 101.

[0043] The hollow cavities 102 are evenly distributed in the template body 101 to reduce weight and improve bending strength. The cross-sectional shape of the hollow cavities 102 is circular, rectangular, square, triangular or hexagonal;

[0044] The hollow cavity 102 is a circular structure with no sharp edges. When subjected to force, stress concentration is minimized, and the compressive and torsional properties are excellent. It is suitable for bearing the circumferential pressure during concrete pouring. During injection molding, the melt has good fluidity and uniform filling, which reduces internal defects. When it is rectangular or square, the right-angled edges form longitudinal and transverse supports, and the bending stiffness is increased by 15%-20% compared to the circle, which is particularly suitable for large-span formwork. When the hollow cavity 102 is a triangle, the triangle is a naturally stable structure. The three sides support each other, and the shear resistance is 30% higher than that of the rectangle, which is suitable for dynamic loads. For the hexagonal shape, it has the characteristics of uniform stress of the circle and high stiffness of the rectangle, and the bending / compressive properties are balanced. It can be flexibly selected according to actual use requirements.

[0045] The reinforcing ribs 103 are arranged between the hollow cavities 102 and are used to enhance the load-bearing capacity of the template body 101. The reinforcing ribs 103 are designed in a crisscross structure and have a thickness of 3-8 mm. The reinforcing ribs 103 are made of a composite material, which includes recycled plastic and basalt fiber. The recycled plastic accounts for 75%-85% of the total mass of the composite material, and the basalt fiber accounts for 15%-25% of the total mass of the composite material. The density of the template body 101 is 0.6-1.2 g / cm;

[0046] The waterproof layer 104 is applied on the surface of the template body 101 . The waterproof layer 104 can be made of water-based polyurethane coatings, which can form a waterproof film on the surface of the template body 101 .

[0047] The present invention provides a novel green construction template and a manufacturing method thereof;

[0048] S1. Crushing, cleaning, melting and filtering recycled plastic (polypropylene or high-density polyethylene) into granules with a particle size of 3-5 mm;

[0049] S2, remove impurities (metal, labels, etc.), melt filter (200 mesh screen);

[0050] S3. Add 2%-5% compatibilizer (such as maleic anhydride grafted polyethylene) to improve the bonding strength with bamboo fiber;

[0051] S4. Processing bamboo into bamboo fiber can be performed by mechanical crushing and sieving to obtain 1-5 mm short fibers, soaking in 4% NaOH solution for 24 hours, washing with water until neutral, drying at 80°C to a moisture content of <3%, and spraying with 1% to 3% silane coupling agent ethanol solution to improve hydrophobicity;

[0052] S5. Mix 50%-70% of recycled plastic and 30%-50% of bamboo fiber in a mass ratio, melt-blend and granulate through a twin-screw extruder;

[0053] S6. Use a high-speed mixer at a speed of 800-1200 rpm for 5-10 minutes to ensure that the particle fibers are evenly dispersed;

[0054] S7, using a twin-screw extruder, with the temperature stepwise: 160°C → 180°C → 190°C → 170°C, melt blending, extrusion and pelletizing;

[0055] S8, the composite material of the reinforcing rib 103 is mixed with 75%-85% of recycled plastic and 15%-25% of basalt fiber in a mass ratio, the length of the basalt fiber can be 6-12mm, and the surface is treated with a silane coupling agent, and then granulated by a twin-screw extruder for use;

[0056] S9, using the same manufacturing process as S6 and S7, but with the melting temperature increased by 10°C;

[0057] S10, using injection molding or hot pressing process, placing evenly distributed hollow cavity 102 mold body and crisscross reinforcement ribs 103 in the mold, melting temperature 180-220 ° C, injection pressure 80-100 MPa, holding time 30-60 s, and performing injection molding;

[0058] S11, apply water-based polyurethane waterproof coating on the surface of the template body 101 to form a waterproof layer 104, and the coating amount of the waterproof layer 104 is 100-150g / m 2, and dry at 80℃ for 30min or cure at room temperature for 24h; S12, trim and polish the forming template body 101, and conduct mechanical property, waterproofness and fire rating tests. The quality inspection standards include: bending strength ≥40MPa, 24h water absorption rate ≤3%, and fire rating reaching B1.

[0059] Example 1:

[0060] Recycled polypropylene 65% + bamboo fiber 35%, reinforced rib 103 is recycled polypropylene 80% + basalt fiber 20%, injection temperature 200℃, pressure 90MPa, pressure holding 40s; water-based polyurethane coating of waterproof layer 104 is 120g / m 2 The density of the template body 101 is 0.85 g / cm 3 , flexural strength 43MPa, water absorption rate 2.3%, fire protection grade B1, turnover number ≥80 times, hollow structure weight reduction 18%, suitable for high-rise building hoisting, basalt fiber reinforced ribs impact resistance increased by 25%, concrete pouring is not easy to crack, suitable for wet basement construction.

[0061] Example 2:

[0062] Recycled high-density polyethylene 50% + bamboo fiber 50%, reinforced rib 103 is recycled high-density polyethylene 75% + basalt fiber 25%, injection temperature 190℃, pressure 100MPa, pressure holding 50s; water-based polyurethane coating of waterproof layer 104 is 150g / m 2 The density of the template body 101 is 1.05 g / cm 3 , flexural strength 47MPa, water absorption rate 2.7%, fire rating B1, high proportion of bamboo fiber, formwork deflection is 30% lower than that of pure plastic formwork, bamboo fiber replaces 50% of plastic, carbon emissions are reduced by 40%, the surface of water-based polyurethane coating is smooth, there is no adhesion after concrete forming, and demolding is convenient and more convenient.

[0063] Example 3:

[0064] Recycled polypropylene 60% + bamboo fiber 40%, reinforced rib 103 is recycled polypropylene 85% + basalt fiber 15%, hot pressing temperature 210℃, pressure 85MPa; water-based polyurethane coating of waterproof layer 104 is 100g / m 2 The density of the template body 101 is 0.75 g / cm 3 , bending strength 45MPa, water absorption rate 1.8%, fire protection grade B1, optimal strength and weight ratio, suitable for multiple scenes such as walls and beams, balanced recycled plastic and bamboo fiber, and raw material cost 35% lower than wooden formwork.

[0065] Compared with traditional hollow plastic formwork, this solution uses pure new plastic polypropylene without fiber reinforcement. In this technology, recycled plastic, bamboo and basalt fiber can recycle waste plastic and natural fibers to achieve resource recycling, making it more environmentally friendly and compliant with green building certification. At the same time, the hollow cavity 102 and reinforcement ribs 103, bionic honeycomb structure, increase the bending strength by 40%. In addition, the water-based polyurethane coating and basalt fiber are embedded in the hollow plastic formwork, which is fireproof and waterproof compared to the hollow plastic formwork coated with fire retardant, and has improved durability.

[0066] Compared with wooden formwork, which damages the ecology by cutting down wood, this technical solution uses waste plastic and fast-growing bamboo to achieve sustainable supply, protect forest resources, and reduce soil erosion. At the same time, wooden formwork is prone to water absorption and expansion. The water absorption rate of this formwork body 101 is ≤3%, and it has a built-in waterproof layer 104, which does not deform in a humid environment.

[0067] In summary: This technology solves the industry pain points of low strength, easy deformation and expansion, environmental pollution and short life of traditional formwork through material innovation, such as the combination of recycled plastics, bamboo and basalt fiber, as well as the hollow cavity 102 and reinforcing ribs 103. It meets the requirements of the "Green Building Evaluation Standard" (GB / T 50378) for renewable materials.

[0068] Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention and are not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art will be able to modify the technical solutions described in the aforementioned embodiments or substitute equivalents for some of the technical features. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. A new type of green construction template and its manufacturing method, characterized by: comprising a template body (101); The template body (101) is made of recyclable and environmentally friendly materials; Hollow cavities (102) are evenly distributed in the template body (101) to reduce weight and increase bending strength; Reinforcing ribs (103) are provided between the hollow cavities (102) and are used to enhance the load-bearing capacity of the template body (101); The waterproof layer (104) is applied on the surface of the template body (101).

2. The new green building template according to claim 1 is characterized by: Recyclable and eco-friendly materials include recycled plastic and bamboo.

3. The new green building template according to claim 1 is characterized by: The cross-sectional shape of the hollow cavity (102) is circular, rectangular, square, triangular or hexagonal.

4. The new green building template according to claim 1 is characterized by: The reinforcing ribs (103) are designed in a crisscross structure and have a thickness of 3-8 mm.

5. The new green building template according to claim 2 is characterized by: The recycled plastic can be polypropylene or high-density polyethylene, accounting for 50%-70% of the total mass of the template body (101).

6. The new green building template according to claim 2 is characterized by: The bamboo material may be bamboo fiber, which accounts for 30%-50% of the total mass of the template body (101).

7. The new green building template according to claim 3 is characterized by: The reinforcing ribs (103) are made of composite materials.

8. The new green building template according to claim 7 is characterized by: The composite material comprises recycled plastic and basalt fiber, wherein the recycled plastic accounts for 75%-85% of the total mass of the composite material, and the basalt fiber accounts for 15%-25% of the total mass of the composite material. The density of the template body (101) is 0.6-1.2 g / cm3.

9. The new green building template according to claim 1 is characterized by: The waterproof layer (104) can be made of water-based polyurethane coatings, which can form a waterproof film on the surface of the template body (101).

10. A method for manufacturing a novel green construction template and a method for manufacturing the same according to any one of claims 1 to 9, characterized in that: S1, will use recycled polypropylene (PP) or high-density polyethylene (HDPE), crush and clean it and then granulate it, and the particle size is controlled at 3-5mm; S2, remove impurities and perform melt filtration; S3, add 2%-5% compatibilizer; S4, processing bamboo into bamboo fiber, soaking it in 4% NaOH solution for 24 hours, washing it with water until it is neutral, drying it at 80°C until the moisture content is less than 3%, and spraying it with 1% to 3% silane coupling agent ethanol solution to improve its hydrophobicity; S5. Mix 50%-70% of recycled plastic and 30%-50% of bamboo fiber in a mass ratio, melt-blend and granulate through a twin-screw extruder; S6. Use a high-speed mixer at a speed of 800-1200 rpm for 5-10 minutes to ensure that the particle fibers are evenly dispersed; S7, using a twin-screw extruder, with the temperature stepwise: 160°C → 180°C → 190°C → 170°C, melt blending, extrusion and pelletizing; S8, the composite material of the reinforcing rib (103) is mixed with 75%-85% of recycled plastic and 15%-25% of basalt fiber in a mass ratio, and granulated for later use; S9, using the same manufacturing process as S6 and S7, but with the melting temperature increased by 10°C; S10, using an injection molding or hot pressing process, placing a uniformly distributed hollow cavity (102) mold body and crisscrossing reinforcing ribs (103) in a mold, and performing injection molding; S11, apply water-based polyurethane waterproof coating on the surface of the template body (101) to form a waterproof layer (104) S12, trimming and polishing the forming template body (101), and performing mechanical property, waterproofness and fireproofing grade tests.

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