Substrate layer prepared from dry desulfurized ash, aldehyde-free reinforced board and preparation methods

Abstract

The invention provides a substrate layer prepared from dry desulfurized ash for a reinforced board. The preparation raw materials comprise the following components by weight percent: 61%-81% of dry desulfurized ash, 18%-38% of thermoplastic plastic and 0.7%-1% of coupling agent. The invention also provides an aldehyde-free reinforced board containing the substrate layer and a wear-resisting layer. The preparation method of the substrate layer for the reinforced board comprises the following steps of: a) carrying out thermal treatment on the dry desulfurized ash by using a circulating fluidized bed process; b) mixing the coupling agent with the dry desulfurized ash subjected to thermal treatment, heating and stirring, then adding the thermoplastic plastic, and stirring; and c) extruding and pelleting the prepared mixture, and carrying out mould pressing or extrusion molding in a flat extruder after pelleting. The prepared aldehyde-free reinforced board does not release harmful aldehydegases, and has the characteristics of oxidation resistance, ageing resistance, watertightness, mildew resistance and warping resistance; and in the production process, secondary pollution is not generated, and wood does not need to be used, thus the production process is environment-friendly and energy-saving, and the standard requirement of a reinforced board industry is reached.

Description

technical field [0001] The invention relates to the field of building materials, in particular to a base material layer prepared by using dry desulfurization ash, a formaldehyde-free reinforced board prepared from the base material layer, and using circulating fluidized bed technology to process dry desulfurization ash, and using the treatment A method for preparing a substrate layer and an formaldehyde-free reinforced board from dry desulfurization ash. Background technique [0002] The boards generally used in the traditional building decoration industry generally have higher requirements on the environment. For example, the traditional wooden boards are easy to expand, deform, mildew, and moth-eaten in a humid environment, and easy to shrink, deform, and crack in a dry environment. Therefore, many problems often occur when used on a large scale. The disadvantages of wooden boards are high strength, wear resistance, easy care, corrosion resistance, compression resistance,...

AI Technical Summary

Problems solved by technology

[0004] The reinforced plate of the thermosetting plastic-inorganic filler system is represented by unsaturated polyester resin. Since thermosetting plastics have high requirements on the purity of inorganic fillers, toxic and harmful substances will be produced once the heating and curing are not complete. If the raw materials with complex components are used, the curing will be affected. Molding, because this kind of thermosetting resin, due to the introduction of inorganic substances in the preparation process, many influencing factors and complex chemical components, the polymerization reaction of some monomers is incomplete, resulting in an increase in the content of aldehydes, and even residual volatile benzene components, and Due to the long release time, it will seriously affect human health for a long time

At present, the development of this kind of reinforced board has been greatly restricted.

[0005] The calcium carbonate treatment process in the thermoplastic-calcium carbonate system is complicated, the cost is high, and the polarity of calcium carbonate is moderate, and the treatment effect of many coupling agents is not obvious, so it is necessary to increase the amount of coupling agent

In addition, other inorganic fillers such as talcum powder, wollastonite and other inorganic fillers with strong polarity need to select high-grade mineral sources and process them into micro-nano particles, which may easily cause pneumoconiosis.

[0006] The reinforced board in the thermoplastic-wood powder system has special requirements for the type of wood powder, and the high-filling wood powder reinforced board is prone to mildew and warping, and at the same time, high-filling wood powder needs to use a large amount of wood, which cannot meet the needs of the reinforced board. To replace wooden boards to reduce deforestation, in addition to achieve high content of non-resin fillers, it is necessary to add lubricants, compatibilizers and plastic antioxidants