Preparation method for improving surface hydrophilicity of nanometer polyethylene terephthalate (PET) films

Abstract

The invention relates to a preparation method for improving the surface hydrophilicity of nanometer polyethylene terephthalate (PET) films, which comprises the following steps that: the nanometer PET films with the cleaned surfaces are placed into a radio frequency plasma generator, the glow discharge is carried out at room temperature under the condition of argon gas or mixed gas of argon gas and helium gas, the work vacuum degree is controlled at 20 to 45Pa, the time is controlled at 3 to 5.5min, the surfaces of the modified nanometer PET films are exposed in the air to carry out the ageingtreatment for 24 to 84 hours, then, the nanometer PET films are placed into the radio frequency plasma generator, the glow discharge is carried out at room temperature under the condition of argon gas or mixed gas of argon gas and helium gas, the work vacuum degree is controlled at 10 to 35Pa, and the time is controlled at 5 to 7.5min. The uniformity of the surface hydrophilicity of the PET filmstreated by the method is good, and the method has the characteristics that the performance repetitiveness is good, the preparation process is simple, and the production efficiency is high.

Description

technical field [0001] The invention relates to a preparation method for improving the surface hydrophilicity of a nano-PET film, belonging to the technical field of PET films. Background technique [0002] Polyethylene terephthalate (PET) is a polymer material with excellent comprehensive properties, and has been widely used in the fields of film, fiber and engineering plastics. However, due to the slow crystallization rate of PET, low heat distortion temperature and poor processability, its application in many fields is limited. Nano-PET uses intercalation polymerization composite technology to uniformly disperse layered silicate in the PET matrix at a nanoscale of 1-100nm in the intercalation copolymerization reaction, and the spherulites of PET are refined, which can greatly improve the crystallization of PET. rate, high barrier properties (O 2 , CO 2 、H 2 O transmittance doubled) and heat resistance. At the same time, the particle size of nanoparticles is smaller t...

AI Technical Summary

Problems solved by technology

However, for the surface modification of nano-PET films, the conventional plasma surface modification often uses a surface modification treatment. Although polar groups can be introduced on the surface, an effective cross-linked layer has not been formed, and a stable A more solid surface layer; or the surface layer treated by plasma is not deep enough, the cross-linked layer is very fragile, and cannot prevent low molecular weight products or additives from overflowing from the surface, forming a weak boundary layer, so although the surface can be made by the post-plasma reaction. Water-based groups, but because the quasi-surface is still a weak structure, the modification effect is generally not obvious, and the aging time is short, so it is difficult to achieve the uniformity of surface hydrophilicity and performance repeatability

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