Mulching film and preparation method thereof

Abstract

The invention provides a mulching film and a preparation method thereof. The mulching film comprises, by weight, 76.5-81.8 parts of linear low-density polyethylene, 15-20 parts of metallocene linear polyethylene, 3-5 parts of high-density polyethylene, 0.02-0.15 part of hindered amine light stabilizer, 0.05-0.15 part of phenolic antioxidant and 0.05-0.2 part of ester-type antioxidant; in particular, the melt flow rate (MFR) of the metallocene linear polyethylene is smaller than or equal to 1.0g/10min, and the density thereof is 0.916-0.922g/cm<3>. The mulching film does not contain ultravioletabsorbing agents and dispersing agents, so that the anti-aging effect is achieved while the production cost is reduced; in particular, the mulching film meets the relevant requirements of the DB65/3189-2014 standard, and can be applied to harsh high-temperature and high-dryness environments such as Xinjiang, thereby having a wide application range.

Description

technical field [0001] The invention relates to a mulch film and a preparation method thereof, in particular to a mulch film without an ultraviolet absorber and a preparation method thereof. Background technique [0002] Mulch film is the ground covering film, which has the functions of increasing temperature and moisture, resisting drought and saving water, improving soil physical and chemical properties, improving soil fertility, suppressing weeds, preventing pests from invading, and promoting plant growth. In our country, plastic film has been widely used in various crops such as grain, cotton, oil, vegetables, melons and fruits, tobacco, sugar, medicine, hemp, tea, forest, etc., and is welcomed by farmers. In my country's three northern regions, factors such as low temperature, little rain, drought, barrenness, and short frost-free period limit the development of agriculture. At this time, plastic film is very important to ensure the growth of crops in arid areas, and it...

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Problems solved by technology

[0004] The Chinese patent with the publication number CN 102660074 A discloses a special weather-resistant functional mulch film for two years, which is made of the following raw materials in weight percentage: LLDPE 60-80%, LDPE5-15%, HDPE3-8%, mPE5- 15%, anti-aging masterbatch 2-6%; wherein, anti-aging masterbatch is made of the following raw materials by weight percentage: LLDPE powder 35-45%, LDPE25-35%, HDPE6-15%, mPE5-12%, 2-7% hindered amine light stabilizer, 0.5-3.5% antioxidant, 0.5-3.5% ultraviolet absorber, 1.5-5.0% dispersant white oil; the above-mentioned weather-resistant film still has high physical and mechanical properties after 360 days of use. Performance retention rate, but the initial mechanical properties do not meet the local standard requirements of Xinjiang (DB65 / 3189-2014), so it cannot be used in Xinjiang's harsh high temperature and high drought environment; in addition, the above-mentioned film uses a large amount of hindered amine light stabilizer and ultraviolet absorbers to achieve anti-aging effects, the cost has increased greatly, and it is difficult to be effectively promoted and applied among farmers

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