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Polyolefin multilayered film for agriculture and method of making same

A polyolefin-based, multi-layer film technology, used in chemical instruments and methods, layered products, synthetic resin layered products, etc., can solve problems such as surface pollution and whiteness, achieve less dirt, achieve long life, prevent Good fog effect

Inactive Publication Date: 2014-03-12
CI KASEI COMPANY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, the ultraviolet-shielding agricultural polyolefin film blended with a benzotriazole-based ultraviolet absorber excellent in ultraviolet-shielding properties has a disadvantage that the ultraviolet absorber migrates to the surface and crystallizes on the surface to contaminate the surface. White

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example

[0041] Next, the present invention will be described in more detail based on examples, but the present invention is not limited by these examples. In addition, the parts showing the usage-amount of each component are parts by weight, and the performance of the agricultural polyolefin multilayer film was calculated|required as follows.

[0042] (1) Ultraviolet shielding property: The total light transmittance at 370 nm of the multilayer film was measured with a spectrophotometer (spectral photometer).

[0043] ◎: transmittance less than 2%

[0044] ○: Transmittance greater than or equal to 2%, less than 5%

[0045] △: Transmittance greater than or equal to 5%, less than 10%

[0046] ×: transmittance greater than or equal to 10%

[0047] (2) Ultraviolet shielding property after exposure: After exposure for 2000 hours using a Sunshine Weather Meter, the total light transmittance at 370 nm of the multilayer film was measured with a spectrophotometer.

[0048] ◎: transmittance le...

example 1

[0063] As an intermediate layer of polyolefin multilayer film for agricultural use, 0.2 parts by weight of water is blended with ethylene-vinyl acetate copolymer (EVA15) having a content of 15% by weight relative to 100 parts by weight of vinyl acetate. A composition of alcalumite and 1.0 parts by weight of a benzotriazole ultraviolet absorber (UVA-1) was subjected to particle processing to obtain particles for an intermediate layer. As the outer layer, 0.2 parts by weight of a benzophenone-based ultraviolet absorber (UVA-2) and 0.5 parts by weight of a metal oxide were blended with respect to 100 parts by weight of a linear low-density polyethylene resin (LLDPE). Particles for the outer layer of ultraviolet absorbers (UVA-3). Using these pellets, two types of three-layer tube-shaped multilayer films were molded with a co-extrusion blow molding machine. The thickness of the multilayer film was 100 μm, and the thickness ratio was outer layer / middle layer / outer layer=1 / 3 / 1.

...

example 2 and comparative example 1～ comparative example 5

[0068] Using pellets in which the additives shown in Table 1 were blended in the same manner as in Example 1, two types of three-layer cylindrical multilayer films were molded with a coextrusion blow molding machine. Next, after treating the outer surface of the cylinder with a corona treatment device in the same manner as in Example 1, it was immersed in the tank used in Example 1 in which the aqueous emulsion composition was placed, and the excess aqueous emulsion composition was removed with a squeeze roller. , and then passed through a vertical hot air drying oven at 120° C. to form an anti-fogging coating film with a thickness of 2 μm. Table 1 shows the evaluation results of physical properties of these film samples.

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PUM

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Abstract

The invention discloses a polyolefin multilayered film for agriculture so disposed that the polyolefin multilayered film herein comprises at least three layers, specifically, a middle layer involving polyolefin resin of 100 part by weight blended with benzo triazole ultraviolet ray absorbent ranging from 0.8 part by weight to 4.5 part by weight and hydrocalumite ranging from 0.1 part by weight to 1.0 part by weight; two outer layers disposed on both sides of the middle layer involving polyolefin resin of 100 part by weight blended with metal oxide ultraviolet ray absorbent ranging from 0.2 part by weight to 0.8 part by weight and benzophenone ultraviolet ray absorbent ranging from 0.02 part by weight to 0.5 part by weight; And the polyolefin multilayered film for agriculture can materially shields ultraviolet ray with a wavelength shorter than 370 mm.

Description

technical field [0001] The present invention relates to an agricultural polyolefin multilayer film with less film fouling during use, particularly an agricultural polyolefin multilayer film capable of maintaining ultraviolet shielding properties over a long period of time, and a method for producing the same. Background technique [0002] As agricultural films for greenhouse cultivation or tunnel cultivation, polyvinyl chloride resin films have been the mainstream until now. It is labor-intensive work for the practitioner. In addition, as the plasticizer bleeds, dust tends to adhere. Therefore, if the surface is not specially processed, the light transmittance will decrease over time. [0003] On the other hand, compared with polyvinyl chloride resin films, polyolefin resin films have low specific gravity, are easy to process, are easy to use, and do not require plasticizers, so from the perspective of less decrease in light transmission during use, Superior to polyvinyl c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B32B27/32B32B27/18B32B33/00C08L23/00C08K5/3475B29C49/04
CPCY02A40/25
Inventor 杉山聡教福田拓郎棚桥幸作
Owner CI KASEI COMPANY
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