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JP-2026075532-A - Biodegradable mulch film

JP2026075532AJP 2026075532 AJP2026075532 AJP 2026075532AJP-2026075532-A

Abstract

[Problem] To provide a biodegradable mulch film that is difficult to biodegrade while used as a covering material, but easily biodegrades after use. [Solution] The biodegradable mulch film comprises a group of colored layers 2 containing resin components and colorants, and an outer layer 5 and an inner layer 6 arranged to sandwich the group of colored layers 2. The group of colored layers 2 includes a white layer 3 containing a white pigment as a colorant and a black layer 4 containing a black pigment as a colorant. The outer layer 5 and inner layer 6 contain aromatic aliphatic polyester. [Selection Diagram] Figure 1

Inventors

  • 久我 誠
  • 染谷 昌幸

Assignees

  • 東罐興業株式会社

Dates

Publication Date
20260508
Application Date
20241022

Claims (8)

  1. A group of colored layers containing resin components and colorants, An outer layer and an inner layer are arranged so as to sandwich the aforementioned group of colored layers, Equipped with, The aforementioned colored layer group is The aforementioned coloring agent includes a white layer containing a white pigment, The aforementioned coloring agent comprises a black layer containing a black pigment, The outer layer and inner layer contain aromatic aliphatic polyester. Biodegradable mulch film.
  2. A biodegradable mulch film according to claim 1, The aforementioned colored layer group includes an aliphatic polyester, Biodegradable mulch film.
  3. A biodegradable mulch film according to claim 2, The aliphatic polyester content in the aforementioned colored layer group is 30% by mass or more. Biodegradable mulch film.
  4. A biodegradable mulch film according to claim 2 or 3, The aliphatic polyester content (mass%) in the black layer is greater than the aliphatic polyester content (mass%) in the white layer. Biodegradable mulch film.
  5. A biodegradable mulch film according to claim 1 or 2, The aforementioned colored layer group further contains inorganic substances other than the white pigment. Biodegradable mulch film.
  6. A biodegradable mulch film according to claim 1 or 2, The aforementioned white pigment contains titanium dioxide. Biodegradable mulch film.
  7. A biodegradable mulch film according to claim 1 or 2, The aforementioned black pigment contains carbon black. Biodegradable mulch film.
  8. A biodegradable mulch film according to claim 1 or 2, The biomass content is 25% by weight or more. Biodegradable mulch film.

Description

This invention relates to a biodegradable mulch film. Agricultural mulch film is a well-known covering material used to protect ridges and other areas where crops are grown. Agricultural mulch film is used to promote stable crop growth by ensuring soil heat retention, suppressing weeds, and reducing moisture evaporation. Incidentally, in agricultural mulch film applications, biodegradable films (hereinafter referred to as "biodegradable mulch films") are sometimes used to eliminate the need for collection and disposal after use, thereby reducing the burden on users. In relation to the above, Patent Document 1 discloses an invention of a biodegradable resin film comprising a reflective layer and a colored layer, wherein the reflective layer is made of a resin composition containing a biodegradable aliphatic aromatic polyester resin and titanium dioxide, and the colored layer is made of a resin composition containing a biodegradable aliphatic aromatic polyester resin and carbon black. According to the invention of Patent Document 1, the biodegradable resin film is biodegraded after use, for example, by plowing it into the soil. Japanese Patent Publication No. 2019-55485 Figure 1 is a schematic cross-sectional view illustrating the biodegradable mulch film according to this embodiment.Figure 2 is a graph showing the evaluation results of the biodegradation performance of Example 1 and Comparative Example 1.Figure 3 is a graph showing the evaluation results of the biodegradation performance of Reference Examples 1 to 3. The embodiments of the present invention will be described below with reference to the drawings. Figure 1 is a schematic cross-sectional view illustrating the biodegradable mulch film 1 according to this embodiment. As shown in Figure 1, the biodegradable mulch film 1 comprises a colored layer group 2 containing resin components and colorants, and an outer layer 5 and an inner layer 6 arranged to sandwich the colored layer group 2. The biodegradable mulch film 1 according to this embodiment is used in the agricultural field, for example, as a covering material for covering ridges where crops are grown. When using the biodegradable mulch film 1, the side exposed to sunlight is the outer layer 5, and the side facing the soil is the inner layer 6. The colored layer group 2 has a white layer 3 containing a white pigment as a coloring agent and a black layer 4 containing a black pigment as a coloring agent. In other words, the biodegradable mulch film 1 is a so-called black and white mulch film. Here, the outer layer 5 and inner layer 6 contain aromatic aliphatic polyester. According to the above configuration, a biodegradable mulch film 1 is provided that is difficult to biodegrade while in use as a covering material, and easily biodegradable after use. Specifically, although the aromatic aliphatic polyester contained in the outer layer 5 and inner layer 6 is biodegradable, its biodegradation rate is relatively slow. Because the outer layer 5 and inner layer 6 contain aromatic aliphatic polyester that is difficult to decompose, even if the colored layer group 2 has a biodegradable structure, initial decomposition can be suppressed. In other words, the progression of biodegradation can be suppressed while in use as a covering material. Furthermore, after the decomposition of the outer layer 5 and inner layer 6 has progressed to a certain extent, the colored layer group 2 will be exposed. Therefore, by adopting a highly biodegradable structure for the colored layer group 2, the biodegradation rate after use can be increased. As a result, a biodegradable mulch film 1 that is difficult to decompose during use and easily decomposes after use is realized. The above is an overview of this embodiment. Next, the detailed configurations of the colored layer group 2, the outer layer 5, and the inner layer 6 will be described. <Colored layer group> As previously described, the colored layer group 2 has a white layer 3 and a black layer 4. The white layer 3 is located on the outside, and the black layer 4 is located on the inside. In the colored layer group 2, the coloring agent is dispersed in the resin. That is, each layer included in the colored layer group 2 contains resin, and the coloring agent is dispersed in that resin. The resin content in the colored layer group 2 is, for example, 50% by mass or more, preferably 70% by mass or more. The resin content may differ between the white layer 3 and the black layer 4. In this case, the resin content in the colored layer group 2 refers to the total resin content in the entire colored layer group 2. For example, even if the resin content in the white layer 3 is less than 50% by mass, the total resin content in the entire colored layer group 2 may be 50% by mass or more depending on the resin content in the black layer 4. This also applies to the content of the other components described below. (Aliphatic polyester) A suitable resin to be included in the colored l