Composite-polydopamine-membrane-modified regenerated EPS particle and portland cement composite foamed warming plate and preparation method thereof

Abstract

The invention discloses a composite-polydopamine-membrane-modified regenerated EPS particle and portland cement composite foamed warming plate. In the foamed warming plate, waste and old polystyrene foamed plastics which is cheap and is low in cost is modified to obtain regenerated EPS particles which are excellent in elasticity and toughness and low in thermal expansion coefficient and resist to temperature and flame. A mixed solution of dopamine hydrochloride and humic acid is used for surface treatment of the regenerated EPS particles, so that the regenerated EPS particles are coated with polydopamine composite membranes. Wettability, bonding strength, interface reaction activity and hydrophobicity of the regenerated EPS particles in a thick liquid are effectively improved. The regenerated EPS particles cooperate with raw materials including portland cement, coal ash, carbide slag, hollow alumina microspheres and cellulose ether. A foamed material good in uniformity and stability is obtained through foaming. The foamed warming plate is uniform and compact in interior structure, excellent in thermal insulation effect, and efficient and simple in production process, is durable, economic and eco-friendly, and has bright application prospects.

Description

technical field [0001] The invention relates to the technical field of cement foam insulation boards, in particular to a composite polydopamine film modified recycled EPS particle-Portland cement composite foam insulation board and a preparation method thereof. Background technique [0002] Establishing an external wall insulation system outside the building is an important measure for energy conservation and emission reduction in the construction industry. At the same time, the establishment of an external wall insulation system can avoid thermal bridges; it can also adjust the indoor temperature according to seasonal changes to avoid damage to the wall caused by the indoor and outdoor temperature difference. Affect the safety and life of use. The external wall insulation materials currently on the market are basically: phenolic, rock wool board, glass wool board, polystyrene board, extruded board, ultra-thin vacuum insulation board and so on. Among them, the cost of rock ...

AI Technical Summary

Problems solved by technology

[0003] Cement foam insulation board is made of cement, fly ash, slag, silica fume and other raw materials through chemical foaming agent. The selection and process of raw materials will directly affect the performance of the product. The cement foam materials currently on the market The quality is uneven, and there are deficiencies in bond strength, water resistance, aging resistance, etc.

In the article "Research on Composite EPS Particle Foamed Cement Foamed Insulation Board", Portland cement and modified EPS particles are mixed and foamed to make an inorganic / organic composite insulation material, which has good heat preservation, water resistance and flame retardancy. However, EPS particles have high rigidity, are brittle and easy to crack, have a large thermal expansion coefficient, and are easy to deform and crack, which directly affects the performance of the composite sheet, so it needs to be further modified to improve its performance.