Method for preparing ternary copolymerized metalize cast polypropylene resin composition

Abstract

The invention relates to a method for preparing a ternary copolymerized metalize cast polypropylene resin composition, comprising the steps of: 1) preparing a ternary copolymerized polypropylene resinbinder: using propylene as a main reaction material, 1-butylene and ethylene as comonomers to carry out copolymerization reaction in a loop reactor to obtain the ternary copolymerized polypropylene resin binder; 2) mixing the ternary copolymerized polypropylene resin binder prepared in the step 1, an antioxidant 1, an antioxidant 2, and a halogen absorber at ambient temperature and pressure, andthen adding the mixture to a twin-screw extruder for granulation to obtain the ternary copolymerized metalize cast polypropylene resin composition. The ternary copolymerized metalize cast polypropylene resin composition of the invention satisfies the processing property, aluminum plating property, optical property and thermal adhesive property for a food grade aluminized film, and also has excellent impact strength, rigidity and low hexane extract content. The resin composition fully meets the requirements of high-end cast film packaging manufacturers for producing aluminized cast films.

Description

technical field [0001] The invention belongs to a method for preparing a polymer material polypropylene resin, in particular to a method for preparing a polypropylene resin composition of an aluminized polypropylene casting film. Background technique [0002] Aluminum-coated polypropylene cast film (Metalize cast polypropylene; MCPP) is a kind of polypropylene film made by casting extrusion process and vacuum aluminum plating in the plastic industry. Compared with LLDPE, LDPE, HDPE, PET and other films, MCPP has lower cost, higher output, higher stiffness than PE film, excellent water vapor and odor barrier properties, and can meet general heat resistance, chemical resistance, resistance Grinding, oxygen resistance, moisture resistance, etc., are widely used in food packaging and other fields. [0003] In recent years, with the continuous development of foreign MCPP special materials, the rapid development of casting equipment technology, and the continuous development of a...

AI Technical Summary

Problems solved by technology

In the prior art, the ternary copolymerization method is usually used to manufacture MCPP special materials. During the polymerization, 2-3% comonomer 1-butene and ethylene are copolymerized with propylene. Usually, the ethylene content is higher than 1-butene. Due to the copolymerization The introduction of the monomer reduces the crystallization properties of the material, the melting point drops significantly, and the heat sealing performance is enhanced. However, the low molecular weight part of the copolymer often has a high ethylene content, which increases the content of low molecular random substances in the resin, resulting in product failure. Hexane extraction is consistently high, limiting its range of applications, especially in food packaging

[0005] In addition, MCPP special materials also require strict control of various additives, such as: slip agent, anti-blocking agent and antistatic agent, etc., to prevent migration and affect the quality of aluminized film. Therefore, MCPP has high requirements for raw materials. At present, The main grades on the market are FL7540L and FL7641L of TPC in Singapore, etc., and there are few domestic MCPP special materials that meet this condition

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