Three-layer co-extruded EVA (ethylene-vinyl acetate copolymer) long-life fog-dissipation environment-friendly multifunctional greenhouse film
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A three-layer co-extrusion, multi-functional technology, applied in the field of agricultural greenhouse film and its preparation, can solve the problems of short life, prone to fog droplets, single function, etc., achieve good coloring and molding processability, improve flexibility, transparency good effect
Active Publication Date: 2013-08-28
HENAN YINFENG PLASTIC
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[0004] Improving the current agricultural film to overcome defects such as single function, prone to fog droplets, and short life has become an urgent demand in the agricultural plastic product market
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Embodiment 1
[0038] The raw material formula is as follows: each component is calculated by weight percentage,
[0039] Outer layer: low density polyethylene 1810D: 20%; linear low density polyethylene 7047: 50%; metallocene polyethylene 1018HA: 20%; dual-proof master batch: 10%;
[0040] Middle layer: low density polyethylene 2426F: 27%; low density polyethylene 2426H: 10%; linear low density polyethylene 7042: 27%; ethylene-vinyl acetate copolymer: 27%; three anti-masterbatch: 9%;
[0041] Inner layer: low density polyethylene 2426F: 25%; low density polyethylene 2426H: 20%; linear low density polyethylene 7042: 15%; ethylene-vinyl acetate copolymer: 30%; three anti-master batch: 10%.
[0062] The three anti-masterbatch is dripping agent (glyceryl monostearate) 20%; light stabiliz...
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Abstract
The invention discloses a nano fog-dissipation multifunctional greenhouse agricultural film, and in particular relates to a three-layer co-extruded EVA (ethylene-vinyl acetate copolymer) long-life fog-dissipation environment-friendly multifunctional greenhouse film, belonging to the field of agricultural mulching films. The raw material formula of an outer layer comprises the following components in percentage by weight: 20-50% of linear low-density polyethylene (LLDPE), 20-50% of low-density polyethylene (LDPE), 10-20% of metallocene polyethylene (mPE) and 5-10% of double-prevention masterbatch; the raw material formula of a middle layer comprises the following components in percentage by weight: 30-40% of ethylene-vinyl acetate copolymer (EVA), 20-40% of linear low-density polyethylene (LLDPE), 20-40% of low-density polyethylene (LDPE) and 5-10% of three-prevention masterbatch; the raw material formula of an inner layer comprises the following components in percentage by weight: 30-40% of ethylene-vinyl acetate copolymer (EVA), 10-20% of linear low-density polyethylene (LLDPE), 20-50% of low-density polyethylene (LDPE) and 5-10% of three-prevention masterbatch; and the formulas of the outer layer, the middle layer and the inner layer are uniformly mixed respectively, master batches are prepared by using a double-head thread screw double-screw extruding machine, a three-layer film is formed through a co-extrusion die head and is extruded out to prepare the multifunctional agricultural greenhouse film. Every quality technical index of the film reaches or exceeds a national standard, and a small part of the indexes is more than 2 times better than the national standard, so that the film is excellent in antiaging performance and cannot generate fog drops, and the service life of the film reaches more than 3 years.
Description
Technical field [0001] The invention relates to an agricultural greenhouse film and a preparation process thereof, in particular to the preparation of a nano anti-fog greenhouse agricultural film by using EVA as a raw material, and belongs to the field of agricultural mulch film. Background technique [0002] Agricultural film is an important means of agricultural production after seeds, fertilizers, and pesticides. Its application has brought a revolution in my country's agricultural production and has made important contributions to agricultural efficiency and farmers' income. Commonly used films are ordinary polyvinyl chloride film, polyvinyl chloride non-drip film, ordinary polyethylene film, polyethylene non-drip film, polyethylene multifunctional composite film, and EVA multifunctional composite film. However, defects such as single function, prone to droplets, and short life span are common. [0003] At present, domestic agriculture has also entered a new stage of developme...
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