Multi-layer coated co-extrusion profile and production method thereof

Abstract

The invention provides a multi-layer coated co-extrusion profile and a production method thereof. The co-extrusion profile comprises a rigid core and a coating layer coating the periphery of the rigid core in a co-extrusion mode, wherein the coating layer comprises an inner coating layer and an outer coating layer, the inner coating layer is prepared from a polyolefin wood-plastic material which takes polyolefin, unsaturated carboxylic acid modified polyolefin and plant fiber powder as main components, the outer coating layer is made of one of a thermoplastic elastomer, a thermoplastic engineering plastic, an ionic polymerization resin and an ionic polymerization resin reinforced polyolefin plastic, a first adhesive layer is also arranged between the rigid core and the inner coating layer, and an adhesive selected by the first adhesive layer is unsaturated carboxylic acid modified polyolefin hot melt glue or polyurethane hot melt glue. According to the invention, through the arrangement of the multi-layer structure, the profile has the physical strength of the core material, the wood-like effect and corrosion resistance of the wood-plastic layer and the wear resistance of the co-extrusion surface layer at the same time.

Description

technical field [0001] The invention relates to a multi-layer cladding co-extrusion profile and a production method thereof, belonging to the technical field of composite profiles. Background technique [0002] In recent years, with the development of the wood-plastic industry, some schemes of using wood-plastic materials to produce profiles have been proposed. Due to the lack of physical strength of pure wood-plastic profiles, in some occasions, especially in outdoor occasions where the profiles need to be laid overhead, their load-bearing capacity is limited, so people usually use wood-plastic clad profiles to meet actual use needs, that is, A material with high physical strength is selected as the core material, and the wood-plastic material is coated on the periphery of the core material, so as to obtain a profile with high physical strength and wood-like effect. For example, the patent document CN201711448420.6 provides a three-layer co-extrusion process of PE, hot mel...

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Problems solved by technology

However, the above solution still has certain defects. When the general wood-plastic material is directly exposed as the cladding layer, there will be problems of wear resistance, insufficient scratch resistance or lack of surface elasticity. After long-term use, the surface is easy to wear, which affects the appearance. degree, and the formation of abrasive grains will further aggravate the wear of wood-plastic materials

In the prior art, light-curing coatings or alumina wear-resistant stickers are usually used to strengthen the surface of wood-plastic materials to improve their wear resistance. Extrusion operation is difficult to carry out continuously, which makes the process more cumbersome and affects production efficiency

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