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CN-121974652-A - Medium Kong Dangao building block and preparation method thereof

CN121974652ACN 121974652 ACN121974652 ACN 121974652ACN-121974652-A

Abstract

The invention provides a medium Kong Dangao building block and a preparation method thereof, which relate to the technical field of building materials and novel wall materials and are prepared from the following raw materials, by weight, 35-65 parts of semi-hydrated gypsum, 40-60 parts of anhydrous II gypsum, 1.5-2.5 parts of nano mesoporous silica or modified nano mesoporous silica, 0.1-0.15 part of polycarboxylate water reducer, 2-5 parts of fiber reinforced materials and 90-150 parts of water. The invention selects the nano mesoporous silica as the hard template agent, and is compounded with two biphase gypsum, namely semi-hydrated gypsum and anhydrous II gypsum to generate the Kong Dangao building block, which has stronger pore canal framework structure and better thermal stability, and has the remarkable advantages of better heat insulation performance, energy conservation, consumption reduction, space conservation, auxiliary material saving, long service life and the like compared with the traditional heat insulation material.

Inventors

  • LU JINSONG
  • ZHAO JIAHANG
  • ZHAO JIANGANG

Assignees

  • 荆门中荆三迪建材科技有限公司
  • 郑州三迪建筑科技有限公司

Dates

Publication Date
20260505
Application Date
20260119

Claims (6)

  1. 1. A building block of Kong Dangao parts by weight is characterized by being prepared from the following raw materials, by weight, 35-65 parts of semi-hydrated gypsum, 40-60 parts of anhydrous II gypsum, 1.5-2.5 parts of nano mesoporous silica or modified nano mesoporous silica, 0.1-0.15 part of a polycarboxylate water reducer, 2-5 parts of a fiber reinforced material and 90-150 parts of water.
  2. 2. The medium Kong Dangao building block according to claim 1, wherein the fiber reinforcement material is a Xuanwu salt fiber or an alkali-resistant glass fiber.
  3. 3. The medium Kong Dangao building block according to claim 1, wherein the modified nano mesoporous silica is prepared by the following preparation method: (1) The substrate pretreatment, namely immersing mesoporous silica into Piranha solution for 30 minutes to fully expose surface hydroxyl groups; (2) High temperature dehydration, namely heat treatment is carried out for 2 hours at 200-400 ℃, and the density of surface hydroxyl groups is reduced to a proper grafting level; (3) Preparing an aminosilane ethanol solution, namely taking absolute ethanol as a main solvent, introducing nitrogen to remove oxygen for 20-40 minutes, and adding aminosilane; (4) The grafting reaction is to add mesoporous silica dehydrated at high temperature into an aminosilane ethanol solution, control the temperature to be 60+/-5 ℃ for 4-8 hours, and continuously introduce nitrogen to isolate water and oxygen; (5) Washing, namely centrifugally washing 3 times by absolute ethyl alcohol to remove the silane oligomer physically adsorbed; (6) Curing, namely vacuum drying for 2 hours at 100-120 ℃, and preparing a ‌ silane solution for strengthening the covalent bond stability of Si-O-Si.
  4. 4. The medium Kong Dangao building block according to claim 3, wherein the aminosilane is 5-15% of the mass of the mesoporous silica.
  5. 5. A block according to claim 3 wherein in step (3) the volume of absolute ethyl alcohol is 10-15 times the volume of aminosilane.
  6. 6. A method of making a mesoporous gypsum block according to any one of claims 1-5, comprising the steps of: (1) Dispersing a template agent, namely adding the polycarboxylate water reducer into water, uniformly stirring, adding nano mesoporous silica or modified nano mesoporous silica, and carrying out ultrasonic treatment for 20-40min to obtain a template agent solution; (2) Mixing and pulping, namely adding semi-hydrated gypsum, anhydrous II gypsum and fiber reinforced materials into a template agent solution, and uniformly mixing to obtain mixed slurry; (3) Pouring and resting, namely pouring into a mould, resting until hardening, controlling the resting temperature to be 25-40 ℃, and delaying the crystallization speed of gypsum to enable the mesoporous structure to be fully formed; (4) Demolding and cutting, namely demolding by a 90-degree long turnover die, and sequentially completing vertical side cutting, longitudinal horizontal cutting and transverse horizontal cutting to obtain the finished product.

Description

Medium Kong Dangao building block and preparation method thereof Technical Field The invention relates to the technical field of building materials and novel wall materials, in particular to a medium Kong Dangao building block and a preparation method thereof. Background The gypsum block is a light building material with building gypsum as main raw material, and is produced through water adding, stirring, casting and drying. In the production process, auxiliary materials such as lightweight aggregate, additive materials, fiber reinforcing materials, foaming agents and the like can be added for improvement. Sometimes, high strength gypsum (alpha gypsum) can also be used as an alternative raw material, making the gypsum block essentially a composite material. In general, the gypsum block is in a three-dimensional cuboid shape, and four sides of the gypsum block are provided with high and low rabbets (tenons and grooves), so that the gypsum block is convenient to construct and install. According to the characteristics of gypsum, the gypsum blocks can be divided into natural gypsum blocks and industrial byproduct gypsum blocks, according to the appearance specifications, standard and nonstandard specification blocks and opposite type blocks, and in the aspect of manufacturing process, the gypsum blocks can be divided into manual gypsum blocks, machine gypsum blocks and the like. The gypsum block is mainly applied to non-bearing walls of frame structures and other structures and is often used as an inner partition wall. It can also bear heavy loads by means of a reasonable fixing and supporting structure. Compared with concrete, the fire resistance of the gypsum block is 5 times higher. Compared with the common paper gypsum board, the fire-resistant grade of the gypsum board is higher than that of a higher-rise building. A gypsum layer with the thickness of 1cm is comparable to a brick and tile layer with the thickness of 3cm, a mortar plastering with the thickness of 4cm or a concrete house with the thickness of 5cm in terms of heat insulation performance. The excellent performance enables the gypsum block to have wide application prospect in the field of construction. When the thickness of the common outer wall brick is 370mm, the heat transfer coefficient is 1.34 Kcal/M2.h.DEG C, and when a gypsum board wall with the thickness of 200mm is used, the heat transfer coefficient is reduced to 0.17 Kcal/M2.h.DEG C, and the energy saving rate is as high as 60%. The gypsum block has a breathing function, can quickly absorb a proper amount of moisture in a room, and releases the moisture when the humidity is reduced, so that the indoor humidity is kept stable. The function of adjusting indoor atmosphere humidity is beneficial to building a living environment and avoiding the generation of condensed water on the wall surface. However, with the improvement of the building energy-saving standard, the existing gypsum block cannot meet 75% of the building energy-saving standard, and the moisture absorption amount of the common gypsum block is only 0.2% of the self weight, so that the temperature regulation efficiency is limited. The mesoporous material is synthesized by adopting a unique nano-sized template, such as a molecular aggregate and a molecular self-assembly mechanism, can design a nano-sized pore structure, and has a better structure-activity relationship, so that a novel heat insulation material with excellent heat insulation capacity and high heat stability is preferred. The structure of the mesoporous phase can be regulated and controlled by a plurality of factors, and the template agent is taken as an example, the type, concentration, size, organic pore-expanding agent and the like of the template can influence the mesoporous structure, and the surfactant is taken as the template, so that the generated liquid crystal phase is the template formed by the mesoporous phase. The micelle of the surfactant with amphiphilic group generates a liquid crystal phase structure with hexagonal ordered arrangement in water solution in advance, inorganic species dissolved in the solvent are filled on the outer surface of the micelle, namely gaps of liquid crystal phase of the micelle, through electrostatic action, and then the inorganic species are polymerized and solidified to form pore walls. How to combine the mesoporous template agent with gypsum to generate the gypsum block with more excellent heat insulation performance and mechanical property. Disclosure of Invention The invention provides a medium Kong Dangao building block and a preparation method thereof, wherein the gypsum building block has a mesoporous structure with the aperture of 2-50nm, can obviously reduce the heat conductivity coefficient and realize the self-heat-preservation function. In order to achieve the technical purpose, the technical scheme of the invention is as follows: the invention provides a medium Kong Dangao building block which is prepared