A multilayer co-extruded film for winter sheds in aquaculture and its preparation method

By using a multi-layer co-extruded film structure composed of composite metallocene low-density polyethylene and modified toughening masterbatch, the problems of reduced anti-drip performance and insufficient low-temperature toughness of the inner layer of the winter greenhouse film for aquaculture have been solved, thereby improving the durability and toughness of the film and ensuring the stability of the aquaculture environment.

CN121799017BActive Publication Date: 2026-05-26ZHUHAI ZHENGTAI NEW MATERIAL TECH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHUHAI ZHENGTAI NEW MATERIAL TECH CO LTD
Filing Date
2026-03-09
Publication Date
2026-05-26

AI Technical Summary

Technical Problem

The functional inner layer of existing aquaculture winter greenhouse film suffers from reduced anti-dripping performance, rapid decline in puncture and tear resistance, and insufficient low-temperature toughness under the combined effects of gravity-induced condensation and external wind loads.

Method used

A multilayer co-extruded film structure composed of composite metallocene low-density polyethylene, modified toughening masterbatch, anti-fogging and anti-dripping agent, and ultraviolet light stabilizer is used to prepare a film with excellent anti-dripping and anti-fogging properties, good mechanical durability and low-temperature toughness by combining a specific ratio and melt index with a multilayer co-extruded blown film process.

Benefits of technology

This ensures that the film maintains its anti-drip properties, puncture resistance, and tear resistance during long-term use, preventing cracking and damage, and ensuring the stability and safety of the aquaculture environment.

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Abstract

This application relates to the field of plastic film molding and processing, and discloses a multilayer co-extruded film for winter sheds in aquaculture and its preparation method. It is produced by co-extrusion and blown film blowing of an outer layer, a first adhesive layer, a middle layer, a second adhesive layer, and an inner layer. The inner layer contains the following weight percentages: 63-71% composite metallocene low-density polyethylene, 10-20% low-density polyethylene, 5-10% modified toughening masterbatch, 5-8% anti-fogging and anti-dripping agent, 0.5-1% UV stabilizer, 0.5-1% UV absorber, 0.2-0.5% antioxidant, and 2.5-5% processing aid. The modified toughening masterbatch contains EPDM rubber, and the anti-fogging and anti-dripping agent is obtained by melt extrusion and granulation of styrene-octene-glycidyl methacrylate copolymer, vinyl elastomer, acrylic modified silicone, long-chain carboxylic acid ester polyoxyethylene, and pentaerythritol stearate. Advantages: good anti-dripping, puncture and tear strength, good low-temperature toughness, and not easily cracked or damaged.
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