Material pellets for halogen-free high-barrier polyolefin gasket and preparation method thereof

Abstract

The invention discloses a material particle for a halogen-free high-barrier polyolefin gasket and a preparation method thereof. The material particle is prepared from the following raw materials in parts by weight: 55.3-85.7 parts of metallocene polyethylene, 15.2-21.4 parts of compatibilizer, 19.4-33.5 parts of flexibilizer, 1.5-3.5 parts of processing agent, and 0.5-1.9 parts of anti-oxidant. During preparation, the material particles is prepared by the following steps: weighing each raw material according to the proportion, stirring in a stirrer, mixing uniformly, adding the mixed materials into an extruder, plasticizing, extruding, granulating and cooling, screening and drying finally, cooling, so as to obtain the material particle for a halogen-free high-barrier polyolefin gasket, wherein the extruding temperature is 160-180 DEG C. The products are non-toxic and odorless and free of any plasticization assistant, so the foot safety requirement is met completely, and the EU standard is met.

Description

technical field [0001] The invention belongs to the technical field of polymer materials, and in particular relates to a material pellet for a halogen-free high-barrier polyolefin gasket and a preparation method thereof. Background technique [0002] At present, 90% of the special gaskets for food packaging lids in China are made of polyvinyl chloride (PVC). PVC bottle mats contain a variety of plasticizers that are harmful to the human body. Among them, the plasticizers are precipitated into the food. The phthalates and oxalic acid in them are carcinogens, so they pose a great safety hazard to food hygiene. Hidden danger. Therefore, the relevant national ministries and commissions have stipulated that since 2011, PVC in contact with food will be phased out. Foreign countries have begun to abandon PVC gasket materials as early as 20 years ago, and use non-PVC gasket particles. The main reasons are as follows: 1. Pressure from environmental protection groups on the use of...

AI Technical Summary

Problems solved by technology

PVC bottle mats contain a variety of plasticizers that are harmful to the human body. Among them, the plasticizers are precipitated into the food. The phthalates and oxalic acid in them are carcinogens, so they pose a great safety hazard to food hygiene. Hidden danger