CN-121974614-A - Polyethylene short fiber reinforced concrete outdoor hollow decorative plate and preparation method thereof

Abstract

The invention discloses a polyethylene short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof, and relates to the field of assembled buildings. The decorative board uses silicate cement as a base material and is matched with polymer coated pre-water-absorbing ceramic particles, polyethylene short fibers and other raw materials, wherein the preparation process comprises the steps of preparing acrylic ester polymer emulsion modified ceramic particles through a core-shell step pre-emulsification process, adding the polyethylene short fibers into a concrete system in batches, uniformly stirring, and carrying out cast-in-situ forming and maintenance to obtain the polyethylene short fiber reinforced concrete outdoor hollow decorative board. The invention solves the problems of easy cracking, large self weight, poor heat preservation and insufficient durability of the traditional outer wall decorative plate, improves the compression resistance, crack resistance and bending strength of the decorative plate, reduces the water absorption, combines the light weight and heat preservation and insulation effects, and meets the development requirements of green buildings.

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 (9)

1. 1. The preparation method of the polyethylene short fiber reinforced concrete outdoor hollow decorative plate comprises the following preparation steps: S1, mixing silicate cement, silica fume, polymer coated pre-water-absorbing ceramsite, quartz sand, fly ash, polyethylene short fiber, a water reducing agent, hydroxypropyl methyl cellulose, sodium lignin sulfonate and water, adding the polyethylene short fiber in batches, and uniformly mixing to obtain polyethylene short fiber reinforced concrete; S2, transferring the polyethylene short 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 polyethylene short fiber reinforced concrete outdoor hollow decorative plate.
2. 2. The preparation method of the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 1 is characterized in that in the step S1, the polyethylene short fiber reinforced concrete outdoor hollow decorative plate comprises, by weight, 80-120 parts of Portland cement, 10-20 parts of silica fume, 10-20 parts of polymer-coated pre-water-absorbing ceramsite, 60-70 parts of quartz sand, 1.2-3 parts of polyethylene short fiber, 10-20 parts of fly ash, 2-3.5 parts of a water reducer, 1.5-3 parts of hydroxypropyl methyl cellulose, 2-4 parts of sodium lignin sulfonate and 16-22 parts of water.
3. 3. The method for preparing the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein the method for preparing the polymer coated pre-water-absorbing ceramsite is as follows: A1, mixing methyl methacrylate, butyl acrylate, a core layer emulsifier, a core layer cross-linking agent and deionized water, heating, and adding an initiator A for reaction to form a core layer pre-emulsion; a2, uniformly mixing butyl acrylate, acrylic acid, a shell emulsifier, deionized water, a shell cross-linking agent and an initiator B to form a shell pre-emulsion; A3, dripping the shell layer pre-emulsion into the core layer pre-emulsion, performing polymerization reaction, cooling after the reaction is finished, and regulating the pH of the emulsion to obtain an acrylic ester polymer emulsion; A4, mixing the ceramsite with acrylic ester polymer emulsion, and vacuum dipping and drying to obtain the polymer coated pre-water-absorbing ceramsite.
4. 4. The preparation method of the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 3 is characterized in that the raw materials in the step A1 are, by weight, 20-40 parts of methyl methacrylate, 10-20 parts of butyl acrylate, 1-2 parts of a core layer emulsifier, 0.5-1.0 part of a core layer cross-linking agent, 0.3-0.5 part of an initiator A and 50-80 parts of deionized water; the raw materials in the step A2 comprise, by weight, 40-60 parts of butyl acrylate, 2-5 parts of acrylic acid, 1-1.5 parts of shell emulsifier, 0.2-0.5 part of shell cross-linking agent, 50-70 parts of deionized water and 1.3-2.0 parts of initiator B; the step A3 comprises 100 parts of ceramsite and 10-15 parts of acrylic ester polymer emulsion in parts by weight.
5. 5. The method for preparing the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 3, wherein the core layer emulsifier is sodium dodecyl sulfate, the shell layer emulsifier is alkylphenol ethoxylate, the core layer cross-linking agent and the shell layer cross-linking agent are divinylbenzene, and the initiator A and the initiator B are potassium persulfate.
6. 6. The method for preparing the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 3, wherein in the step A1, the initiator A is added after the temperature is raised to 75-80 ℃, and the reaction is carried out for 20-40 min at 75-82 ℃; in the step A3, the polymerization is carried out for 1h to 1.5h at 75 ℃ to 80 ℃, the system is cooled to 40 ℃ to 50 ℃ after the reaction is finished, and the pH value of the emulsion is regulated to 7 to 8 by ammonia water; In the step A4, the ceramsite and the acrylic ester polymer emulsion are stirred at the room temperature at the rotating speed of 100rpm-200rpm for 10min-20min, are soaked in vacuum for 10min-15min under the vacuum degree of minus 0.08-minus 0.095MPa, and are dried for 2h-4h at the temperature of 60 ℃ to 80 ℃.
7. 7. The method for preparing the polyethylene short fiber reinforced concrete outdoor hollow decorative board according to claim 1, wherein in the step S1, the polyethylene short fiber is added in 2-4 times, and is stirred for 1min-2min at 200rpm-400rpm after each addition.
8. 8. The method for preparing the polyethylene short fiber reinforced concrete outdoor hollow decorative plate according to claim 1, wherein in the step S3, curing is specifically performed for 21-28 days in an environment with the temperature of 18-22 ℃ and the relative humidity of more than or equal to 95%.
9. 9. A polyethylene short fiber reinforced concrete outdoor hollow decorative sheet manufactured by the method for manufacturing a polyethylene short fiber reinforced concrete outdoor hollow decorative sheet according to any one of claims 1 to 8.

Description

Polyethylene 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 polyethylene short fiber reinforced concrete outdoor hollow decorative plate and a preparation method thereof. Background With the rapid development of assembly type buildings and green buildings, the outdoor outer wall decorative plate is used as a core member of the outer facade of the building, and indexes such as mechanical property, weather resistance, energy conservation and environmental protection are paid more attention to. The outdoor outer wall decorative board on the market at present mainly comprises glass curtain walls, sintered outer wall ceramic tiles, marble slabs, ordinary concrete slabs and other products, but various traditional decorative boards have obvious technical short boards. The traditional glass curtain wall and the sintered outer wall ceramic tile consume a large amount of energy sources in the production link, wherein harmful pollutants are easy to generate in the firing process of the sintered ceramic tile, the development trend of green low carbon is not met, the marble plate depends on natural mineral resources, the natural ecological environment can be seriously damaged in the mining and cutting link, and irreversible vegetation and geological damage are caused. The common concrete exterior wall decorative plate has the advantages of relatively low cost, common problems of heavy self weight and large thickness, increased load of a building main body, and increased comprehensive cost of transportation, hoisting and construction, and meanwhile, the common concrete exterior wall decorative plate has high heat conductivity, poor heat insulation performance, difficulty in meeting the requirements of building energy conservation and consumption reduction, is influenced by natural factors such as temperature change, rain erosion and the like in the long-term outdoor use process, is easy to crack, fall off and the like, has insufficient durability, and has higher later maintenance cost. In order to improve the concrete performance, the concrete mixing proportion is usually optimized by adding short fibers such as steel fibers, carbon fibers, polypropylene fibers and the like in the prior art, so as to try to improve the compression resistance and crack resistance of the concrete, but the conventional short fibers have poor compatibility with concrete base materials, insufficient dispersibility, difficulty in fully playing the roles of reinforcing and toughening, and the problems that common concrete decorative plates are easy to crack and unstable in mechanical properties can not be fundamentally solved. In addition, the traditional concrete decorative plate is of a solid structure, so that the problems of overlarge dead weight and poor heat preservation effect are further aggravated, and the defects of high energy consumption, large carbon emission, low construction efficiency and the like in a cast-in-place construction mode also exist, so that the construction requirement of high efficiency and environmental protection of the assembled building cannot be adapted. Disclosure of Invention In view of the above, the invention aims to provide a polyethylene short fiber reinforced concrete outdoor hollow decorative board and a preparation method thereof, which effectively solve the problems of easy cracking, heavy weight, poor heat preservation effect and insufficient durability of the traditional outdoor outer wall decorative board. The aim of the invention can be achieved by the following technical scheme: In a first aspect, the invention provides a preparation method of a polyethylene short fiber reinforced concrete outdoor hollow decorative plate, which comprises the following preparation steps: s1, adding silicate cement, silica fume, polymer coated pre-water-absorbing ceramsite, quartz sand, fly ash, polyethylene short fiber, a water reducing agent, hydroxypropyl methyl cellulose, sodium lignin sulfonate and water into a stirring device for stirring, then adding the polyethylene short fiber in batches, and uniformly stirring to obtain polyethylene short fiber reinforced concrete; S2, transferring the polyethylene short 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 polyethylene short fiber reinforced concrete outdoor hollow decorative plate. Further, in the step S1, the polyethylene short fiber is added for 2 to 4 times, and is stirred for 1 to 2 minutes at a rotation speed of 200 to 400rpm after each addition. Further, in the step S3, curing is specifically performed for 21-28 days in an environment with the temperature of 18-22 ℃ and the relative humidity of more than or equal to 95%. Further, the step S1