Film-grade nylon 6 pellets and production method thereof

Abstract

The invention relates to film-grade nylon 6 pellets and a production method thereof. After a recovered extraction concentrated solution is purified, the extraction concentrated solution is mixed withsolid raw materials, homogenization is carried out, an additive is added, the mixture is preheated and then fed into a depolymerizing reactor using gas self-stirring, after high-temperature and high-pressure depolymerization, high-pressure prepolymerization and post-polymerization pressure reduction are carried out, after underwater pelletizing, extraction, drying and cooling are carried out, andthe film-grade nylon 6 pellets are obtained. The relative viscosity of the obtained film-grade nylon 6 pellets can be controlled to be 3.2+ / -0.030, the viscosity deviation can be controlled to be smaller than or equal to + / -0.030, and the content of hot-water extract is smaller than or equal to 0.3 wt%, wherein the content of cyclic dimer is smaller than or equal to 0.05 wt%, the content of residual water is smaller than or equal to 0.04 wt%, and the chromaticity is -5--3.5+ / -1, so that the film-grade nylon 6 pellets have high quality.

Description

technical field [0001] The invention relates to the industrial production technology of nylon 6, in particular to a film-grade nylon 6 slice and a production method thereof. Background technique [0002] With the rapid development of our country's economy, the per capita consumption level and living standard are increasing day by day, thus promoting the popularity of supermarkets and the rapid development of tourism, and the packaging consumption of various commodities has increased sharply. [0003] The BOPA biaxially stretched nylon 6 film made of nylon 6 is biaxially stretched during the film forming process, which strengthens the orientation of the molecular chain, increases the crystallinity, improves the mechanical properties, and the gloss, transparency and The gas barrier properties are improved accordingly, and the polymer molecules of BOPA film are in a plane orientation state, so compared with other packaging films, it has high puncture resistance, high rupture re...

AI Technical Summary

Problems solved by technology

[0004] The existing membrane-grade nylon 6 slices are prone to crystal points and membrane rupture during the film-drawing process. The reason is that the impurity components in the nylon 6 slices cannot meet the deformation requirements during the film-drawing process. These components are mainly cyclic dimers, Polymers, carbides and gels, etc.

During the film rolling process, the film products that are in contact with each other are easy to stick, which affects storage and transportation. Usually, a filter is added when the film is pulled, and the filtering effect is average, which affects the output.

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