Easily-processed low-smoke halogen-free flame-retardant heat shrinkable label sleeve as well as preparation and application thereof

Abstract

The invention discloses an easily-processed low-smoke halogen-free flame-retardant heat shrinkable label sleeve as well as a preparation method and application thereof. The identification sleeve consists of the following components in parts by weight: 60 to 100 parts of polyolefin resin, 5 to 20 parts of polymer compatilizer, 30 to 70 parts of nano magnesium hydroxide, 70 to 120 parts of surface activated superfine magnesium hydroxide or aluminum hydroxide, 30 to 50 parts of antimony trioxide, 10 to 20 parts of melamine cyanurate, 1 to 3 parts of lubricant, 0.8 to 2 parts of antioxidant, 1 to 2.5 parts of sensitizer and 0.6 to 1 part of processing aid. The preparation method comprises the following steps of: mixing the raw materials uniformly, extruding, drawing, air cooling and granulating; extruding into a pipe through a screw extruder with a neck mould and a core mould; radiating, expanding, stretching, cooling, sizing, printing the label by using a heat transfer printer to obtain the low-smoke halogen-free flame-retardant heat shrinkable label sleeve. The preparation method is simple; and the product has excellent flame-retardant performance, produces little smoke, permanently preserves the label, and has good mechanical property and processing performance. The sleeve can be applied to facilities with high environment-friendly requirement.

Description

technical field [0001] The invention relates to a flame-retardant marking sleeve with ethylene-vinyl acetate copolymer as a matrix resin, in particular to an easy-to-process low-smoke, halogen-free, flame-retardant heat-shrinkable marking sleeve and its preparation method and application. Background technique [0002] In the flame retardant formula of the marking sleeve, the halogen-free flame retardants are mainly magnesium hydroxide and aluminum hydroxide, but a large amount of addition can be used to achieve a suitable flame retardant grade. At the same time, the mechanical properties and processing properties of the material are different. Will be greatly discounted. In previous application studies, silicone resins were mostly added to resin formulations as flame retardants or synergistic flame retardants, as described in patent application CN 101921432. There are few studies on silicon-based additives that can significantly improve the processing properties of material...

AI Technical Summary

Problems solved by technology

Silicone oil, as a type of additive, is more common in this kind of application research, but in the actual application process, because silicone oil is liquid and has a certain viscosity, it will encounter the problem of difficult to add accurately, so it needs to be added in the traditional production The process is equipped with auxiliary equipment that can be added in a metered manner, which complicates the product manufacturing process and increases the production input cost. Silicon oil is added to the formulas of patent applications CN1266867A and CN 1180017C, and the latter is mainly derived from silicon-based flame retardants. Consider adding silicone oil

In order to avoid the above-mentioned problems, solid silicone resins are often used in the industry to improve processing performance, but the problem of low efficiency is common, which is reflected in the fact that the addition of flame retardant-based powders is not large. The amount of silicone resin added is relatively large: as in the patent application CN 101280084A, 2.2% silicone resin is added as a processing aid, and the flame retardant system is a halogen system harmful to the environment, and the amount added is below 50%; in the patent application CN 1850899A Add 1.2-1.6% polymer silicone as a lubricant, and add less than 60% flame retardant

[0003] In the process of marking printing, the surface performance of the sleeve is the key factor to determine the quality of the marking. In order to obtain better surface properties, the amount of powder added to the material formula is often not high, or the processing aids are increased accordingly. The added amount will eventually burden the production cost

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