A kind of fiber-reinforced building formwork and preparation method thereof

Abstract

Provided are a fiber-reinforced building formwork and a preparation method thereof. The fiber-reinforced building formwork comprises a board core and face layers covering the upper surface and the lower surface of the board core; the board core comprises multiple layers of veneers which are bonded into a whole and have wood fibers, and the directions of the wood fibers of the adjacent veneers are mutually perpendicular; each face layer comprises 1-4 fiber-reinforced prepreg sheet layers which are connected into a whole in a composited mode, each fiber-reinforced prepreg sheet layer is formed by compositing fiber products and high-molecular resin, and each face layer and the board core are connected into a whole through a bonding layer. After the building formwork is boiled for two hours in boiling water in a pressure cooker and cooled for one hour at room temperature, the retention rate of the static bending intensity is at least 90%, and the retention rate of the static bending modulus is at least 90%. The formwork is excellent in mechanical property, good in waterproof and breakage-proof property and long in service life, and the per-use cost of the formwork is reduced; use of wood is avoided, and therefore the formwork is more environmentally friendly.

Description

technical field [0001] The invention relates to a fiber-reinforced building template and a preparation method thereof. Background technique [0002] Building formwork is an indispensable material in concrete pouring engineering, and the material of building formwork determines its service life and use effect. At present, the formwork used in the construction industry includes metal formwork, wooden plywood and plastic formwork. Among them, aluminum formwork is often used for metal formwork. Aluminum formwork has high strength and high rigidity, so it has a long service life, but the price of aluminum formwork is very expensive. For low-rise buildings, the construction period is short, and it is difficult to remove the formwork after the construction period is over. For the convenience of demoulding, a release agent is required. After long-term use, the release agent will remain on the aluminum formwork and cause the aluminum formwork to be corroded, resulting in The poured ...

AI Technical Summary

Problems solved by technology

At present, the formwork used in the construction industry includes metal formwork, wooden plywood and plastic formwork. Among them, aluminum formwork is often used for metal formwork. Aluminum formwork has high strength and high rigidity, so it has a long service life, but the price of aluminum formwork is very expensive. For low-rise buildings, the construction period is short, and it is difficult to remove the formwork after the construction period is over. For the convenience of demoulding, a release agent is required. After long-term use, the release agent will remain on the aluminum formwork and cause the aluminum formwork to be corroded, resulting in The poured cement wall has an unattractive appearance and does not meet the requirements; and wooden plywood is a building formwork used more in China's construction industry. This kind of building formwork is cheap, but due to differences in processing technology, the quality of wooden plywood is uneven, and Wooden plywood has low strength, is easy to corrode, and has a short service life. At the same time, because it is made of a large amount of wood, it causes a lot of waste of wood resources and damages the natural environment; in order to solve the shortage of wood plywood, many plastic templates have emerged, such as PVC Foam board, wood-plastic formwork, GMT plastic formwork and plastic-coated recycled formwork, etc., but the above-mentioned plastic formwork has the problems of low strength and low rigidity, and the corners of these plastic formwork are easily damaged when falling from a high altitude. At the same time, these plastic formwork Poor weather resistance and short service life

[0003] In order to solve the problems existing in the above-mentioned building templates, the following patents disclose technical solutions to solve some of the problems: 1. Patent 201310027431.2 discloses a laminated board and its preparation method and application. The surface layer and the core layer of the laminated board pass through Adhesive film, adhesive cut-off, non-woven fabric connection, because different adhesive media have different processing conditions, therefore, according to different adhesive media, different processing techniques need to be set up, resulting in complicated procedures. It can be seen that this kind of laminated board is not It is suitable for mass production, and the production efficiency is low; 2. Patent 201310422446.9 discloses a laminated board for building formwork and its manufacturing method. The continuous fiber reinforced thermoplastic prepreg is produced, and then the generated continuous fiber reinforced thermoplastic prepreg and the short fiber reinforced thermoplastic prepreg are placed back, and a layer of non-woven fabric is covered on the surface, and the heat is pressed for 20~30min. Then cold press for 30~40 minutes to get the fiber reinforced thermoplastic surface layer covered with non-woven fabric on one side. Since the board core is made of ordinary fast-growing wood veneer, wood particle board or density fiber board, the board core made of these materials has low mechanical properties. The service life is short, and the manufacturing process of the surface layer is complicated, and the production efficiency is low; 3. Patent 201110000869.2 discloses a continuous fiber plastic-coated strip compound reinforced building formwork and its preparation method. It is 2~4 layers of continuous fiber-coated plastic strips, and the multi-layer continuous fiber-coated plastic strips are combined to form a surface layer, and the surface layer and the board core are bonded together by hot-melt adhesive film on both sides to form a building formwork , because the hot-melt adhesive film is expensive, it greatly increases the cost of the building formwork, and the adhesive used to prepare wood-oriented strand board is generally a thermosetting glue, which is not firmly bonded to the hot-melt adhesive film. If it is used for a long time, the building formwork will bubble. , bulging, resulting in a sudden drop in the mechanical properties of the formwork; 4. Patent 201310023482.8 discloses a wood mold plastic-coated building formwork and its preparation method. Olefin veneer, there is a veneer bonded between the surface layer and the core. Since the core is made of waste formwork, even if the veneer is bonded on the outer layer of the core, the problem of poor quality of the waste formwork cannot be avoided. The board core made of this kind of waste formwork is easy to break during use, and the corners are easy to be damaged, and there are many recycling processes of waste formwork, which is labor-intensive and costly; 5. Patent 201110247581.5 discloses a plastic-faced plywood with high turnover times Construction formwork and its preparation method, the board core is wood plywood, non-woven fabrics are bonded to the upper and lower surfaces of the wood plywood, and polyolefin veneers are bonded to the corresponding end non-woven fabrics. The structure of this formwork is simple, but , due to the harsh environment in which the building formwork is used, the polyolefin surface layer is easily damaged during installation and violent disassembly, resulting in the formwork being not waterproof and reducing the service life

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