A black-and-white two-color thermal insulation and anti-aging six-type greenhouse film and its preparation method

Abstract

A black and white two-color thermal insulation and aging-resistant six-type greenhouse film, comprising an inner layer, a middle layer and an outer layer; the thickness ratio of the inner layer, the middle layer and the outer layer is 3:(3-6):3; the inner layer is composed of the following weight parts. Composition: 400-600 parts of mLLDPE, 40-60 parts of longevity masterbatch, 12-18 parts of black masterbatch; the middle layer is composed of the following components by weight: 300-500 parts of LDPE, 75-125 parts of EVA, and longevity masterbatch 37.5-62.5 parts, white masterbatch 30-50 parts; the outer layer is composed of the following components by weight: LLDPE 100-300 parts, mLLDPE 150-450 parts, longevity masterbatch 25-75 parts, white masterbatch 12.5-37.5 parts share.

Description

technical field [0001] The invention relates to the technical field of greenhouse films, and more specifically relates to a black-and-white double-color heat preservation and anti-aging six-type greenhouse film and a preparation method thereof. Background technique [0002] In recent years, the plastic greenhouse film industry has developed vigorously, and all kinds of plastic greenhouse films have emerged continuously. However, in order to ensure lower costs, manufacturers will control a larger inflation ratio, but a larger inflation ratio will lead to quality degradation of the greenhouse film. Reduced, some areas are too thin, and it is easy to age and break after a long time; therefore, in order to ensure the quality of the greenhouse film, the inflation ratio needs to be small. However, a small inflation ratio will lead to a substantial increase in cost. Conducive to market promotion. [0003] In addition, in order to achieve the effect of heat preservation, the plasti...

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Problems solved by technology

[0002] In recent years, the plastic greenhouse film industry has developed vigorously, and all kinds of plastic greenhouse films have emerged continuously. However, in order to ensure lower costs, manufacturers will control a larger inflation ratio, but a larger inflation ratio will lead to quality degradation of the greenhouse film. Reduced, some areas are too thin, and it is easy to age and break after a long time; therefore, in order to ensure the quality of the greenhouse film, the inflation ratio needs to be small. However, a small inflation ratio will lead to a substantial increase in cost. Conducive to market promotion

[0003] In addition, in order to achieve the effect of heat preservation, the plastic greenhouse films currently on the market have to sacrifice the light transmission effect, which is not conducive to the growth of crops; Insulation compound compound, however, as time goes by, the small molecules in the greenhouse film will migrate, resulting in uneven distribution of the film, local quality degradation, and even the problem of "fish eyes"

[0004] Commonly used materials for greenhouse film are low-density polyethylene and linear low-density polyethylene. For low-density polyethylene, it is easy to exceed the deformation rate when it is unrolled, and molecular entanglement occurs, thereby affecting the quality of the greenhouse film; linear low-density polyethylene Ethylene is a copolymer of ethylene and a small amount of higher α-olefins, so compared with low-density polyethylene, it has better fluidity, but it also has greater viscosity, making processing difficult

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