Halogen-free flame-retardant master batch

Abstract

The invention discloses a halogen-free flame-retardant master batch. The halogen-free flame-retardant master batch is composed of the following raw materials in parts by mass: 30-80 parts of halogen-free flame retardant, 15-69.7 parts of polyolefin carrier, 0.2-2 parts of silicone oil, and 0.1-3 parts of coupling agent. During preparation, the raw materials aforementioned are weighed according to a ratio at first, and then the polyolefin carrier, the silicone oil and the coupling agent are added in a high-speed stirring machine and stirred for 3 minutes with a medium-low speed, and finally, the halogen-free flame retardant is added and stirred for 5 minutes with a high speed; and the stirred raw materials are transferred into a two-stage vacuum double-screw extruder, and granulated via extrusion, wherein the temperature of the extruder is set to be 100-130 DEG C. The halogen-free flame-retardant master batch disclosed by the invention is excellent in mechanical property, good in water resistance, excellent in physical and mechanical properties, and easy to process and store.

Description

(1) Technical field [0001] The invention relates to a halogen-free flame-retardant masterbatch. (2) Background technology [0002] In order to improve the safety of use and enable PP to be used in a wider range of fields, a lot of research and development work has been done on the flame retardancy of polypropylene at home and abroad. The development of flame retardant PP is mainly to add flame retardants to PP to make PP have Flame retardant effect. Traditional flame retardants are halogen flame retardants, but halogen flame retardants will emit black smoke when burning, and produce toxic substances such as dioxins, which seriously threaten the natural environment and human health. At present, the European Union has banned the use of such Substance products enter the country, so halogenated flame retardants are gradually being replaced by new environmentally friendly flame retardants. [0003] Chemical phosphorus intumescent flame retardants generally use P, N and C as the...

AI Technical Summary

Problems solved by technology

[0004] However, intumescent flame retardants have the following disadvantages: 1. The polarity difference between intumescent flame retardants and polymers is very large, resulting in poor compatibility, which reduces the electrical and insulating properties of polymers, especially mechanical properties. Properties such as strength and toughness are greatly reduced; 2. Intumescent flame retardants have strong hygroscopicity

Such as APP / PER / MA intumescent flame retardant system, not only polyhydroxy PER is easy to absorb moisture, but also prone to alcoholysis between components, resulting in poor water resistance of flame retardant polymers; 3. Usually, the relative molecular weight of intumescent flame retardants is small , easy to migrate to the surface of the polymer, resulting in poor mechanical properties of flame retardant products, especially poor appearance; 4. Difficult to process, more small molecules of intumescent flame retardants, poor thermal stability, easy to decompose when heated, and NH3 will decompose during processing come out, causing the surface of the rod to be sticky and not easy to process