A method for surface modification of polyolefin materials

Abstract

The present invention relates to a method for surface modification of polyolefin materials, which comprises the following steps: (a) subjecting polyolefin materials to surface chlorination in a chlorine-containing solution to obtain chlorinated polyolefin materials; Substituted polyolefin materials are immersed in the grafting reaction solution, and photocatalytic-atom transfer radical reaction is carried out under the action of light irradiation. The surface modification of polyolefin materials can be realized through surface chlorination reaction and photocatalytic-atom transfer radical reaction without causing deep damage to the polyolefin surface, and the reaction temperature can be lowered to room temperature, which greatly shortens the grafting time; The surface functionalization treatment of olefin materials is uniform, and corresponding functional groups can be obtained on the surface of polyolefin materials according to requirements.

Description

technical field [0001] The invention belongs to the field of material surface modification, and relates to a method for surface modification of polyolefin materials, in particular to a surface treatment method based on photocatalysis-ATPR grafting technology for polyethylene, polypropylene and their copolymers. Background technique [0002] Polyethylene, polypropylene and their copolymers are important general-purpose thermoplastics, which are widely used because of their good mechanical properties, processability, corrosion resistance and electrical insulation. Thermoplastic polyolefin materials can be easily formed by extrusion, blow molding, injection molding, casting, stretching and other processes to prepare various product forms such as molding materials, pipes, films, fibers, and porous separation membranes. Since polyolefin is composed of inert methylene and methyl groups, and has a certain degree of crystallinity, its surface lacks active groups and has low surface ...

AI Technical Summary

Problems solved by technology

Although chemical oxidation, plasma treatment, corona discharge treatment and other methods can effectively introduce small molecular polar groups on the surface of polyolefin materials, these polar groups are unstable, and the modified surface properties are time-sensitive. Under the effect of oxidation or thermal movement of molecular chains, the surface polarity is easily lost

The surface grafting method can introduce high molecular weight polar polymers on the surface of polyolefin materials, and the modified surface has good durability, but the traditional polyolefin surface grafting method has low grafting efficiency, high reaction temperature, and long reaction time. Disadvantages limit its application. ZL201610587498.5 proposes a method of modifying ultra-high polyethylene fibers using ARTP technology, but this method has high polymerization temperature, volatile solvents, and long grafting time. It does not use continuous production. Therefore, it is necessary to develop an ARTP surface modification technology that not only polymerizes at room temperature, but also shortens the grafting time.

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