JPH02102265A - Fluorescent film of agricultural synthetic resin - Google Patents

Abstract

PURPOSE:To obtain the title film which can retain fluorescent properties even after a long-term use by adding a fluorescent agent which can be excited with ultraviolet rays and a specified metal organophosphate to a synthetic resin. CONSTITUTION:A fluorescent film of an agricultural synthetic resin is produced by mixing a synthetic resin (e.g., PVC) with a fluorescent agent which can be excited with ultraviolet rays (e.g., triazole or oxazole fluorescent agent) with a metal organophosphate of formula I or II (wherein R is a 10-20C alkyl or alkenyl, and M is Zn or Ca) e.g., Zn or Ca salt of monoisodecyl phosphate or dihexadecyl phosphate. This film has fluorescent properties of converting 380nm or shorter ultraviolet rays of sunlight which cannot be utilized for the growth of plants into longer ultraviolet rays useful for the growth of plants, and the properties can be retained for a long time in outdoor use because of the action of the metal organophosphate.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field 1] The present invention relates to an agricultural synthetic resin fluorescent film that retains its fluorescent ability even after long-term use.

[Conventional technology] In recent years, so-called greenhouse horticulture, in which useful plants are forced to grow in greenhouses or tunnels under low light conditions (autumn to winter), has become extremely widespread, and is used to provide a stable supply of fresh vegetables, fruits, flower petals, etc. It has been. PVC resin film is often used as a material to cover greenhouses or tunnels used for greenhouse horticulture because of its excellent weather resistance, transparency, heat retention, and strength. In greenhouse horticulture, the temperature and light necessary for plant growth are often insufficient, and in order to increase the effect of forced cultivation, supplementation of this temperature and light is required.

For temperature replenishment inside a house or tunnel, a system has been established that uses heaters, multiple layers of covering material, etc.

On the other hand, since using electric lights to replenish light beams is too expensive, studies have been conducted on ways to replenish ultraviolet rays by converting them into useful light spectra.

In other words, 380n that is not used for plant growth due to sunlight
In order to convert ultraviolet rays below m into light quality and make them useful rays,
Fluorescent agents are used that are excited by ultraviolet light and convert it into light with longer wavelengths. However, these fluorescent agents generally have weak resistance to ultraviolet rays, so their fluorescent ability decreases in a short period of time outdoors.

Additionally, if a fluorescent agent and a UV absorber are used together, most of the UV light necessary to excite the fluorescent agent will be absorbed by the UV absorber, so if they are used together, the fluorescence ability will be significantly reduced. , it shows no fluorescence at all. As described above, converting the light quality of ultraviolet rays is not a method that is sufficiently useful for replenishing light rays.

[Problem to be Solved by the Invention 1] Under such circumstances, the present inventors have conducted intensive studies on an agricultural synthetic resin fluorescent film that converts ultraviolet rays into useful light and is useful for replenishing useful light over a long period of time. As a result, they discovered that the desired objective could be achieved by using a fluorescent agent excited by ultraviolet rays, an organic phosphate metal salt or an 1fl+7 phosphate metal salt, and an epoxy compound, thereby completing the present invention. It was.

That is, the object of the present invention is to maintain the fluorescence ability for a long time even when used outdoors by converting ultraviolet rays into light rays useful for plant growth, and to make ultraviolet rays sufficiently effective for exciting fluorescent agents. To provide a synthetic resin fluorescent film for agricultural use that can be utilized and sufficiently supplied with useful light rays.

[Means for Solving the Problems 1] However, the gist of the present invention is that a synthetic resin,
The present invention relates to an agricultural synthetic resin fluorescent film containing a fluorescent agent excited by ultraviolet rays, a metal salt of m17 phosphate, or an epoxy compound.

The present invention will be explained in detail below.

In the present invention, synthetic resins include vinyl chloride resins, polyolefin resins, (meth)acrylic resins, etc., and are not particularly limited as long as they can be used as agricultural covering materials. It is preferable to use a vinyl chloride resin.

For example, vinyl chloride resins include polyvinyl chloride,
Copolymers mainly composed of vinyl chloride with other comonomers,
Mixtures of these or mixtures of these with other polymers or copolymers are used.

The agricultural vinyl chloride resin fluorescent film of the present invention usually contains 20 to 60 parts by weight of a plasticizer per 100 parts by weight of the vinyl chloride resin to impart flexibility.

The polyolefin resin includes, for example, a homopolymer of ethylene, or a copolymer of ethylene and a comonomer copolymerizable therewith, specifically, vinyl acetate, vinyl chloride, or the like.

The ultraviolet-excited 11 used in the present invention includes stilbene type fluorescent agents such as diaminostilbendisulfonic acid derivatives and distilbenzene derivatives; diaminofluorescent agents such as benzidine derivatives, benzidine sulfonic acid derivatives, and diaminofluorene derivatives. Diphenyl-type fluorescent agent; Imigusol-type fluorescent agent; Imigsolone-type fluorescent agent; Triazole-type fluorescent agent; Thiazole-type fluorescent agent; Oxazole-type fluorescent agent; Coumarin-type fluorescent agent; Carbostyryl-type fluorescent agent; In addition to currently commercially available organic fluorescent agents such as fluorescent agents and dihydropyridine fluorescent agents, europium-activated form of yttrium vanadate (YVO, :Eu);
Tin-activated form of strontium phosphate'v gnesium [
(S rMg), (PO-)2:Snl, manganese-activated form of magnesium heptogenate germanate (3,5Mg
Examples include inorganic fluorescent agents such as 0.0.0.5MgF2.Gem2: Mn).

The proportion of the above fluorescent agent to be blended with the synthetic resin is appropriately determined depending on the type of fluorescent agent, luminous properties, efficiency, etc., but generally from 0.01 to 100 parts by weight of the synthetic resin to be blended.
It is used in a range of 5 parts by weight. If the amount added is less than 0.01 parts by weight, the fluorescence ability will be weak and the object of the present invention will not be achieved. Moreover, when the amount added is more than 5 parts by weight, it is not preferable because self-quenching occurs and no fluorescence ability is exhibited.

The organic phosphate metal salt used in the agricultural film of the present invention is a compound represented by the following general formula (1) or (II), and both may be used in combination.

[(ROhP-012M...(1) (wherein, R is an alkyl group or alkenyl group having 10 to 20 carbon atoms, and M represents zinc or calcium) Specifically, monoisodecylphos-7ate , diisodecylphos-7ate, monododecylphos-7ate, didodecylphos-7ate, monohexadecylphos-7ate, diisodecylphos-7ate, monooctadecylphos-7ate,
Mention may be made of zinc or calcium salts such as dioctadecylphos-7ate.

The amount of these phosphates added is preferably 0.1 to 3 parts by weight per 100 parts by weight of the synthetic resin. Epoxy compounds used in the agricultural film of the present invention include epoxidized soybean oil, epoxidized Examples include epoxidized higher fatty acid esters such as linseed oil, resin-type epoxy compounds, and the like. The resin type epoxy compound is preferably a bisphenol type or novolak type epoxy resin, for example.

Specific examples of bisphenol-type epoxy resins include commercially available products such as GY280 (manufactured by Chippa Iggy) and Epicor 828 (manufactured by Shell), and specific examples of novolac-type epoxy resins include DEN438 (manufactured by Dow Chemical). etc. can be used.

The amount of these epoxy compounds added is preferably 1 to 5 parts by weight per 100 parts by weight of the synthetic resin.

In addition to the above-mentioned compounds, the agricultural synthetic resin fluorescent film of the present invention may contain known additives that are usually blended into synthetic resins for molding, if necessary.

These additives are added in the usual amount, for example, 100% of the synthetic resin.
It can be used in an amount of 10 parts by weight or less.

Conventional blending or mixing techniques may be employed to blend the above compounds into the synthetic resin.

Specifically, for example, a method using a Bonpregu, Banbury mixer, super mixer, or other blender or mixer can be adopted.

In order to produce a ml film from the synthetic resin composition obtained in this way, a commonly used film manufacturing method such as a calendar molding method, an extrusion molding method, an inflation molding method, etc. can be appropriately adopted. .

The thickness of the film according to the present invention is 0.03 to 0.5 mm, preferably 0.05 mm, considering strength, handling work, etc.
It is preferable to set it in the range of ~0.311Ifi.

[Effects of the Invention] The present invention has the following effects, and its practical utility value is extremely large.

■ The agricultural synthetic resin fluorescent film of the present invention eliminates ultraviolet rays of 380 nm or less, which are not used for plant growth in sunlight.
It has the ability to convert fluorescence to longer wavelengths useful for plant growth, but due to the action of metal organic phosphates or the combined use of metal organic phosphates and epoxy compounds, the fluorescence ability remains even when used outdoors. Retained for a long time.

■ Ultraviolet rays can be used effectively to excite fluorescent agents, resulting in a large amount of light quality conversion and a sufficient supply of useful light.

[Example 1] Hereinafter, the present invention will be explained in detail based on Examples.
The present invention is not limited to the following examples unless it exceeds the gist thereof.

Examples 1 to 3, Comparative Examples 1 to 4 Polyvinyl chloride (P=1300) 100 parts by weight Dioctyl 7-talate 42 Tricresyl phosphate 5 Calcium-zinc liquid stabilizer 3 Calcium-zinc powder stabilizer
2 Oxazole type fluorescent agent (product name 0.5)
The basic composition was Uvitex-OB (manufactured by Chippa Iggy Co., Ltd., maximum excitation wavelength: 375 nm), and various additives of types and amounts as shown in Table 1 were added thereto.

This mixture was fed to a calender roll heated to 180"C, kneaded, and then formed into a film with a thickness of 0.11 mm by a conventional method.

Each film was placed in a field in Shigun, Mie Prefecture, with a height of 2mm and a width of 3mm.
A pipe house with a glossy length of 10+n extending from east to west was coated in January 1963.

The films on the south roof were collected 1 month, 3 months, and 5 months after the start of spreading, and the fluorescence intensity and retention rate of fluorescence ability were measured for each film. The results are shown in Table 1.

\ Note Wood 1 The amount added is the number of parts by weight per 100 parts by weight of polyvinyl chloride.

*2 7-7-l type epoxy resin compound manufactured by Shell.

*3 7-borac type poxy resin compound manufactured by Gra Chemical Company.

*4 Manufactured by Ciba Iggy.

Tree 5 Fluorescent emission area is 420-520 nun.

Tree 6 Using a light energy measuring device (Model O3MO-601) manufactured by Optical Science Co., Ltd., the sunlight transmitted energy of the sample film was measured. The degree of increase in transmitted energy in the fluorescence emission region is calculated and shown for those (without).

Value calculated from

From Table 1, it is clear that the film obtained from the composition according to the present invention has a high fluorescence ability, and even when used outdoors, it retains its fluorescence ability and its retention rate is extremely excellent. It is.

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Claims (2)

[Claims] (1) An agricultural synthetic resin fluorescent film comprising a synthetic resin containing a fluorescent agent excited by ultraviolet rays and an organic phosphate metal salt represented by the following general formula (I) or (II). General formula ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼... (I) ▲ There are mathematical formulas, chemical formulas, tables, etc. ▼... (II) (In the formula, R is an alkyl group with 10 to 20 carbon atoms or It is an alkenyl group, and M represents zinc or calcium.) (2) The agricultural synthetic resin fluorescent film according to claim 1, which contains an epoxy compound.