JPS5921004Y2 - Agricultural resin laminate film - Google Patents

Description

[Detailed description of the invention] This invention contains a large amount of ultraviolet absorber, and is almost 100%
The present invention relates to an agricultural resin laminate film that can absorb ultraviolet rays, that is, can block the transmission of ultraviolet rays.

Conventionally, synthetic resin films such as polyvinyl chloride films have been used in large quantities as agricultural films, such as spreading films for vinyl greenhouses, due to their transparency, mechanical properties, and stability. A film can only be put to practical use if it contains additives such as an antifogging agent, an antistatic agent, and a weather resistance improver to prevent fogging caused by adhesion of dust.

On the other hand, among the crops cultivated and raised in vinyl greenhouses and simple greenhouses, there are many crops that do not like exposure to ultraviolet rays, or for which it is desirable to limit exposure to ultraviolet rays to avoid overgrowth. It is desirable to grow crops while shielding them from ultraviolet rays.

However, conventional agricultural films have virtually no UV-blocking ability, and therefore, in order to avoid intense UV rays, plastic greenhouses are often covered with an outer covering that further blocks sunlight. Doing this would also block out light, which is important for crops, and the complicated operations and operations were one of the tricks to increasing crop production and improving quality.

In addition, since vinyl greenhouse cultivation involves cultivating crops in a high temperature and humid environment, plant disease-causing molds are much more likely to occur than in open field cultivation, and the damage caused by fungal diseases to crops is significant.

Traditionally, crops were protected from disease by spraying pesticides several times.

Therefore 1. As a result of spraying pesticides, crops were grown that were contaminated with pesticides, and the pesticides caused serious harm, such as environmental pollution and farmers' health.

The present invention provides an agricultural film for improving and improving these aspects.

It has been conventional practice to add ultraviolet absorbers to synthetic resin molded products, but the purpose of this addition is mainly to improve weather resistance before molding, so conventionally ultraviolet absorbers are added in very small amounts, usually zero. It was added in an amount of about .2 to 0.8 PHR.

This amount can significantly improve weather resistance by absorbing ultraviolet rays, and further use of expensive ultraviolet absorbers becomes uneconomical. This is because it could not be realized until now due to its volatility and compatibility with resins.

However, as a result of various studies, the inventors of the present invention found that by adopting a solution casting method for film production, IPH was added to the film.
It is now possible to contain ultraviolet absorbers of R or higher,
This has made it possible to provide a film that absorbs and blocks almost 100% of ultraviolet rays.

Moreover, according to the present invention, the thickness of the film can be set in the range of 30 to 100 μ, which is suitable for use as an agricultural film, which is extremely advantageous.

According to the present invention, the film is made by laminating a polyvinyl chloride resin film and a polymethacrylate resin film containing an ultraviolet absorber of 1 PHR or more, and has a thickness of 30 to 100 μm and absorbs almost 100 μm of ultraviolet light. % agricultural resin laminate film is provided.

In the present invention, the ultraviolet absorbers blended into the film are conventionally known benzotriazole-based, benzophenone-based,
Any type of material, such as salicylic acid esters, can be used.

In addition, the synthetic resins that can be used to form the laminate film of the present invention include polyvinyl chloride or polyvinyl chloride-based resins mainly composed of polyvinyl chloride; and polymethacrylates such as polymethyl methacrylate and polyethyl methacrylate. It is a polymethacrylate ester-based resin mainly composed of acrylic esters or these methacrylic esters.

A UV absorber with an IPHR or higher is blended into the resin, and a film is produced by a solution casting method.

The thus formed polyvinyl chloride resin film and polymethacrylate resin film are laminated to form a laminate film having a thickness of 30 to 100 μm.

The laminate film of the present invention will be explained with reference to the attached drawings. In the figure, 1 is a polyvinyl chloride film containing a benzotriazole-based ultraviolet absorber in IPHR, and 2 is a polyvinyl chloride film containing the same benzotriazole-based ultraviolet absorber in IPHR.
Polymethyl methacrylate film containing PHR,
Both are heat-pressed and made into a laminate film.

The agricultural resin laminate film of the present invention is useful as a vinyl house film as described above for cultivating and growing crops that require ultraviolet shielding, and is also suitable for storing and preserving agricultural products.

That is, when green onions are exposed to ultraviolet rays during storage, their surface becomes hard and difficult to eat, reducing their commercial value.

Therefore, in the past, it was necessary to build a shed to store onions, but if the resin film of the present invention is used and the film is processed into, for example, a bag shape and packaged, there is no need to build a shed.

In addition, the resin film of the present invention has a wide range of uses in protecting agricultural products, such as preventing discoloration of the thatch of Enoki mushrooms and Gonmaku after harvest due to ultraviolet rays, and preventing the growth of mold by blocking ultraviolet rays.

Furthermore, it goes without saying that antistatic agents, antifogging agents, antioxidants, etc., which are usually added to conventional agricultural films, may be added to the film of the present invention.

[Brief explanation of drawings]

The figure is a cross-sectional view of the synthetic resin laminate film of the present invention. 1... Polyvinyl chloride film, 2...
・Polymethyl methacrylate film.

Claims (1)

[Scope of utility model registration request] Agricultural resin having a thickness of 30 to 100μ and capable of absorbing almost 100% of ultraviolet rays, which is made by laminating 1 to 1 of a polyvinyl chloride resin film and a polymethacrylate ester resin film containing an ultraviolet absorber of IPHR or higher Lamiho 1~Film.