High-toughness and crack-resistant plastic for pipe and preparation method of high-toughness and crack-resistant plastic

Abstract

The invention relates to a plastic for an aluminum and plastic composite pipe and particularly relates to a high-toughness and crack-resistant plastic for the aluminum and plastic composite pipe and apreparation method of the high-toughness and crack-resistant plastic. The plastic is prepared from a raw material composition, and on the basis that the weight part of polyethylene resin is 100, theraw material composition comprises the components in parts by weight: 100 parts of polyethylene resin, 20-60 parts of polyether polyol, 10-35 parts of isocyanate, 5-12 parts of inorganic filler particles, 0.5-3 parts of chain extender and 1-10 parts of surfactant. According to the high-toughness and crack-resistant plastic for the pipe, provided by the invention, the polyether polyol is introducedto the surface of the polyethylene resin, and the polyethylene resin further reacts with isocyanate to obtain a composite resin formed by reticulated interlacing of the polyethylene resin and polyurethane resin, and the composite resin has the advantages of lightweight, high strength and high toughness and is capable of expanding and shrinking when adapting to cold and thermal shock, greatly prolonging to the service life of the aluminum and plastic composite pipe when being used as an outer-layer plastic of the aluminum and plastic composite pipe and avoiding the phenomena of separation andcracking of a pipe layer.

Description

Technical field [0001] The invention relates to plastics for aluminum-plastic composite pipes, in particular to a high-toughness anti-cracking plastic for aluminum-plastic composite pipes and a preparation method thereof. Background technique [0002] The aluminum-plastic composite pipe is composed of plastic, hot melt adhesive, aluminum alloy, hot melt adhesive, and plastic from the inside to the outside. It has good heat preservation performance, and the inner and outer walls are not easy to corrode. Because the inner wall is smooth, it has little resistance to fluid. ; Because of its good bending performance, it is more convenient to install and construct. As a water supply pipe, the aluminum-plastic composite pipe has sufficient strength. [0003] There are three main types of aluminum-plastic composite pipes on the market: (1) PE / AL / PE; (2) PE / AL / PEX; (3) PEX / AL / PEX. Among them, the first one is that both the inner and outer layers are made of poly Ethylene, the second is the...

AI Technical Summary

Problems solved by technology

The role of the aluminum layer is to increase the strength of internal pressure resistance, block oxygen, etc., so as to avoid the threat of corrosion to the water pipeline equipment, and the aluminum layer can improve the heat conduction effect to avoid heat concentration, antistatic and good shielding performance, and has a certain flame retardant effect ; Compared with traditional polyethylene, cross-linked polyethylene has a more stable intermolecular structure and is more suitable for building water supply and heating systems. However, the shrinkage rate of pipes made of ordinary cross-linked polyethylene materials is relatively large. Users generally report that the inner and outer layers of aluminum-plastic composite pipes, steel-plastic pipes, and copper-plastic pipes shrink due to the shrinkage of cross-linked polyethylene, so that the circumferential hot melt adhesive cannot bond the metal to the cross-linked polyethylene firmly, and the shelf life of the product is short , the stability of the production process is poor; and, when the aluminum-plastic composite pipe is used as a hot water pipe, due to long-term thermal expansion and contraction, the pipe wall will be misaligned and cause leakage, which directly leads to the use of the product. shortened lifespan