Composite board and preparation method

Abstract

The invention provides a composite board and a preparation method. The composite board comprises a surface layer and an intermediate layer, wherein the intermediate layer comprises a composite layer and a fiber gridding cloth layer; the surface layer is respectively prepared from the following raw materials in parts by weight: 20 to 50 parts of cement, 10 to 50 parts of mineral powder, 0.5 to 5 parts of surface-layer minerals, 2 to 35 parts of plant fiber, 0.2 to 2 parts of chopped composite fiber, 10 to 50 parts of water and 1 to 3 parts of an additive; the composite layer is prepared from the following raw materials in parts by weight: 30 to 40 parts of sulfate aluminum cement, 20 to 30 parts of the mineral powder, 5 to 10 parts of micro-nano silicon powder, 25 to 30 parts of the plant fiber, 0.5 to 1 part of the chopped composite fiber, 15 to 30 parts of the water and 1 to 3 parts of the additive; the composite layer and the fiber gridding cloth layer are paved at intervals. By adopting a compounding technology of ultrafine mineral powder and the additive and through an interface agent, fiber gridding cloth is treated; by adopting a high-pressure compression molding technology,the water absorption rate of a bare board of the composite board is smaller than or equal to 7.0 percent; through 28-day maintenance, the bending strength is greater than or equal to 40 MPa, the tensile strength is greater than or equal to 50 MPa, the humidity deformation is smaller than or equal to 0.01 percent, and the impervious performance and the corrosion resistance are enhanced.

Description

technical field [0001] The invention relates to a green building material, in particular to a composite board and a preparation method. Background technique [0002] With the development of modern architecture, the "greening" of building materials is happening quietly, and energy saving, environmental protection and lightweight are becoming the development trend of building materials. Fiber cement board is a board made of cement as the basic material and reinforced with minerals, fibers, cement and other fibers. [0003] Among them, cement-based building wall materials gradually replace wood, wood-based panels, plastic panels, and metal panel products to become the first choice for prefabricated buildings due to their high fire resistance, no release of formaldehyde, VOC and other volatile toxic substances, and their environmental friendliness and high cost performance. The materials used have broad market prospects; while ordinary cement fiberboards, calcium silicate board...

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Problems solved by technology

[0003] Among them, cement-based building wall materials gradually replace wood, wood-based panels, plastic panels, and metal panel products to become the first choice for prefabricated buildings due to their high fire resistance, no release of formaldehyde, VOC and other volatile toxic substances, and their environmental friendliness and high cost performance. The materials used have broad market prospects; while ordinary cement fiberboards, calcium silicate boards, gypsum boards and other products are generally prepared by the process of copying, rolling, extrusion and low-pressure pressing. Strength, waterproof and impermeability are relatively weak, which limits the scope of application and grade

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