CN-121974613-A - Polypropylene short fiber reinforced concrete outdoor hollow decorative plate and preparation method thereof

Abstract

The invention discloses a polypropylene short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof, and relates to the field of assembled buildings. The decorative board takes cement as a base material, is matched with spherical silica micropowder, vitrified microbeads, fly ash and other raw materials, is added with polypropylene short fibers subjected to acrylic acid grafting modification, adopts a modified dispersing agent compounded by sodium lignin sulfonate, calcium stearate and polyethylene glycol, and is prepared into short fibers through premixing, melt extrusion, grafting reaction, stirring fluidization, cast-in-situ forming and curing to obtain a finished product.

Inventors

• MENG JIANJUN
• Yang Liuyiyi
• WANG JIANJUN
• DAI RUNDENG
• Zhai Linqi
• ZHANG HAO
• YANG XIAOHUA
• LU MIAO
• HUANG XINYI

Assignees

• 帆颖装配式建筑科技(新乡)有限公司
• 湖南工业大学

Dates

Publication Date

20260505

Application Date

20251208

Claims (8)

1. 1. The outdoor hollow decorative board is characterized by comprising, by weight, 80-120 parts of cement, 10-20 parts of spherical silica powder, 1.2-3 parts of polypropylene short fibers, 20-40 parts of vitrified micro bubbles, 10-20 parts of fly ash, 2-3.5 parts of a water reducing agent, 1.5-3 parts of cellulose, 2-4 parts of lignin and 16-22 parts of water.
2. 2. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 1, wherein the preparation method of the polypropylene short fiber is as follows: A1, mixing homopolymerized polypropylene resin, a modified dispersing agent, hindered phenol antioxidant, phosphite antioxidant and glyceryl stearate, and then melt-blending and extruding a primary strand through a double-screw extruder; a2, adding the primary strand into a grafting reaction liquid, heating to react under the protection of nitrogen, cooling to room temperature, cutting off and removing dust to obtain the polypropylene short fiber.
3. 3. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 2 is characterized in that the polypropylene short fiber is prepared from, by weight, 100 parts of homopolymerized polypropylene resin, 6-12 parts of modified dispersing agents, 0.4-1.0 part of hindered phenol antioxidants, 0.2-0.8 part of phosphite antioxidants, 0.3-0.8 part of glyceryl stearate and 53-91 parts of grafting reaction liquid.
4. 4. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 2, wherein the grafting reaction liquid is prepared from, by weight, 3-6 parts of acrylic acid, 30-50 parts of benzoyl peroxide and 20-35 parts of absolute ethyl alcohol.
5. 5. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 2, wherein the preparation method of the modified dispersing agent is as follows: Adding sodium lignin sulfonate, calcium stearate and polyethylene glycol into deionized water, ultrasonically mixing, and concentrating to obtain the modified dispersing agent.
6. 6. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 5, wherein the modified dispersing agent comprises, by weight, 2-4 parts of sodium lignin sulfonate, 2-5 parts of calcium stearate, 1-3 parts of polyethylene glycol and 20-50 parts of deionized water.
7. 7. The polypropylene short fiber reinforced concrete outdoor hollow decorative board according to claim 1, wherein the thickness of the polypropylene short fiber reinforced concrete outdoor hollow decorative board is 60mm-240mm, parallel hollow channels are reserved in the middle of the board along the length direction of the board, and the hollow channels are rectangular, octagonal, round or oval. The separation wall thickness between the pore channels is 7.0mm-12.0mm, and the thickness of the pore channel edge to the plate surface is 9.0mm-15.0mm.
8. 8. A method for preparing the polypropylene short fiber reinforced concrete outdoor hollow decorative board according to any one of claims 1 to 7, comprising the following preparation steps: S1, adding cement, spherical silica micropowder, vitrified microsphere fine powder, fly ash, a water reducing agent, cellulose, lignin and water into a stirring device for stirring, adding polypropylene short fibers in batches for stirring uniformly, and then adding water for stirring fluidization to obtain fiber reinforced concrete; S2, operating the fiber reinforced concrete into a decorative plate mold, and obtaining a molded outdoor hollow decorative plate after cast-in-situ molding and curing; and S3, curing the formed outdoor hollow decorative plate to obtain the polypropylene short fiber reinforced concrete outdoor hollow decorative plate.

Description

Polypropylene short fiber reinforced concrete outdoor hollow decorative plate and preparation method thereof Technical Field The invention relates to the field of assembled buildings, in particular to a polypropylene short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof. Background The common reinforced concrete has the defects of low tensile strength and poor bearing capacity, and has complex and harsh stress environment in structures such as large-span building floor plates, bridge floors, subways, various tunnel arch walls and the like, and the surface of the reinforced concrete is easy to crack in normal use, so that internal reinforcing steel bars are rusted to cause fracture and damage, and the service life of a building (structure) and the structural safety are seriously influenced. In order to improve the compressive strength, toughness and crack resistance of the reinforced concrete, short fibers such as steel fibers, carbon fibers, glass fibers, polypropylene fibers, polyethylene fibers, ultra-high molecular weight polyethylene fibers, basalt and the like are added into a reinforced concrete matrix, and the mixing ratio of concrete materials is improved, so that the compressive strength and crack resistance of the concrete structure can be obviously improved, and the deformation resistance of the concrete structure is improved. The traditional outer wall decorative plate adopts glass curtain wall, sintering outer wall ceramic tile, marble plate, ordinary concrete slab etc. more, and traditional outer wall decorative plate needs to consume a large amount of energy in thermoforming in-process, and marble plate exploitation cutting in-process destroys and pollutes natural environment, and ordinary concrete slab thickness is great, and the dead weight is big, and thermal conductivity is big, heat preservation effect is poor, the phenomenon such as fracture appears easily to the outer wall decorative plate in the use, drops. The traditional exterior wall decorative plate also has the problems of poor durability, high later maintenance cost and the like. And the polypropylene short fiber reinforced ultra-high performance concrete outdoor hollow decorative plate for the building is manufactured in a factory, transported to a building construction site, spliced by utilizing tenons and grooves reserved on two sides of the decorative plate, and assembled and installed with a building owner in a field through a reliable connection mode. Compared with the cast-in-place wallboard, the assembled wallboard can save energy resources, reduce labor force and improve construction quality. According to the measurement and calculation of a professional institution, the assembly type decorative wallboard can be installed to effectively reduce energy consumption, reduce carbon emission and save construction sites. Disclosure of Invention In view of the above, the invention aims to provide a polypropylene short fiber reinforced concrete outdoor hollow decorative board and a preparation method thereof, which can effectively solve the problems of easy cracking, heavy weight, poor heat preservation and insufficient durability of the traditional outer wall decorative board, and has excellent mechanical property, cracking resistance and weather resistance. The aim of the invention can be achieved by the following technical scheme: The first aspect provides a polypropylene short fiber reinforced concrete outdoor hollow decorative plate which is characterized by comprising, by weight, 100 parts of cement, 10-20 parts of spherical silica powder, 1.2-3 parts of polypropylene short fibers, 20-40 parts of vitrified microbeads, 10-20 parts of fly ash, 2-3.5 parts of a water reducer, 1.5-3 parts of cellulose, 2-4 parts of lignin and 16-22 parts of water. Further, the preparation method of the polypropylene short fiber comprises the following steps: A1, mixing homopolymerized polypropylene resin, a modified dispersing agent, hindered phenol antioxidant, phosphite antioxidant and glyceryl stearate, and then melt-blending and extruding a primary strand through a double-screw extruder; A2, adding the primary strand into absolute ethyl alcohol, adding acrylic acid and benzoyl peroxide, heating to react under the protection of nitrogen, cooling to room temperature, and cutting to obtain the polypropylene short fiber. Further, the specific preparation method of the polypropylene short fiber comprises the following steps: Firstly, adding homo-polypropylene resin, a modified dispersing agent, a hindered phenol antioxidant, a phosphite antioxidant and glyceryl stearate into a high-speed mixer, mixing for 15min-25min at the rotation speed of 900rpm-1200rpm and the temperature of 70-85 ℃ to realize pre-dispersion of raw materials, then feeding the pre-mixed materials into a double-screw extruder, setting the barrel temperature to 175-185 ℃ along the gradient from a feeding end to a discharging end, 190-