Three-layer co-extruded high-heat-preservation light-conversion PO film

Abstract

The invention discloses a three-layer co-extruded high-heat-preservation light-conversion PO film, and belongs to the field of agricultural greenhouse films. According to the invention, on the basis of a previous product, ethylene-vinyl acetate copolymer (EVA) is added into metallocene polyethylene (mPE), a light-conversion master batch is added into a middle layer, the formulas of an outer layer,the middle layer and an inner layer are different, the formulas of the outer layer, the middle layer and the inner layer are mixed uniformly respectively, master batches are prepared by using a two-thread worm double-screw extruder, a three-layer film extrusion is formed through a co-extrusion die head to prepare a PO agricultural greenhouse film, and water-based dripping fog-eliminating coatingliquid is coated outside the PO film. The film is anti-aging and free of fog drops, and excellent in puncture resistance and has a service life of 3 years or more. After inspection and testing by an authoritative department, all quality and technical indexes reach or exceed a national standard, some of which are more than twice as good as the national standard. The PO film is good in light-conversion effect, has a light conversion rate reaching 13% or more, is very beneficial to the growth of crops and shortens the growth period of the crops at the same time.

Description

technical field [0001] The invention relates to a PO film and a preparation process thereof, in particular to the preparation of a PO film by using high-grade olefin raw materials and other additives as raw materials, and belongs to the field of agricultural greenhouse films. Background technique [0002] PO film (agricultural greenhouse film) is an agricultural composite layer greenhouse film. It was first produced in Japan by using high-grade olefin raw materials and other additives. It is a new type of multi-layer high-grade functional polyolefin agricultural greenhouse produced by external spraying and drying. membrane. [0003] PO film is a new generation of agricultural greenhouse film. Since its introduction, it has been favored by the majority of growers for its excellent anti-fog and dripping properties, high light transmission, and high heat preservation. Synchronization of membrane life. In recent years, manufacturers in my country's agricultural film industry h...

AI Technical Summary

Problems solved by technology

But at present PO agricultural shed film generally has a single function deficiency. The applicant has improved the PO agricultural shed film in the invention patent "three-layer co-extrusion EVA long-life anti-fog and environmental protection multifunctional greenhouse film 201310219304.2" applied in the previous period. Mix the formulations of the outer layer, middle layer and inner layer evenly, and use a twin-head threaded screw twin-screw extruder to make a masterbatch, which is extruded through a co-extrusion die to form a three-layer film, which has excellent anti-aging performance and no mist. Functional agricultural greenhouse film

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