JPH0713167B2 - Vinyl chloride resin film for agriculture - Google Patents

Description

Detailed Description of the Invention

[0001]

FIELD OF THE INVENTION The present invention relates to a vinyl chloride resin film for agriculture. More specifically, it relates to an agricultural vinyl chloride resin film having excellent weather resistance.

[0002]

2. Description of the Related Art Vinyl chloride resin films have been widely used for many years as agricultural films in greenhouse cultivation and tunnel cultivation of agricultural products because of their excellent transparency, heat retention and strength. However, a general vinyl chloride resin film has a drawback that it deteriorates in brown color within a few months when it is used outdoors.
In order to make up for such drawbacks, for example, an organotin stabilizer,
Stabilizers against light heat and oxidation such as metal soap stabilizers, lead stabilizers, organic cadmium stabilizers, organic barium stabilizers, antioxidants, UV absorbers, etc. are blended, but in combination of these compounding agents However, no remarkable stabilizing effect was observed. Therefore, an epoxy compound or a phosphoric acid ester is currently used as a stabilizing aid for improving the weather resistance, and the phosphoric acid ester is widely used since it is relatively effective.

[0003]

On the other hand, on the other hand, in recent years, due to resource saving and energy saving, the agricultural film tends to be used for a long period of time, and even if phosphoric acid ester is blended from the viewpoint of sustaining weather resistance. It's not enough.

[0004]

Under the circumstances, the inventors of the present invention have made extensive studies for the purpose of providing an agricultural vinyl chloride resin film having weather resistance that lasts for a long period of time. Has been completed. Therefore, the gist of the present invention is that 1 to 10 parts by weight of trixylyl phosphate are added to 100 parts by weight of vinyl chloride resin.
Parts by weight, 0.1 to 3.0 parts by weight of the organophosphate metal salt represented by the following general formula (I) or (II), and an average particle size of 3 μm.
0.5 to 10 parts by weight of the following magnesium hydroxide, and 0.5 to 10 parts by weight of hydrotalcites represented by the following general formula (III) having an average particle size of 3 μm or less, and
The present invention relates to an agricultural vinyl chloride resin film obtained by filmizing a composition having a total content of magnesium hydroxide and hydrotalcites of 6 to 20 parts by weight.

[0005]

[Chemical 2]

(In the formula, R represents an alkyl group or alkenyl group having 10 to 20 carbon atoms, M represents zinc or calcium, and x and m are 0 <x <0.5 and 0 ≦ m ≦ 2. .)
Hereinafter, the present invention will be described in detail.

In the present invention, the vinyl chloride resin means
In addition to polyvinyl chloride, it means a copolymer of vinyl chloride as a main component with other comonomer, a mixture thereof, or a mixture of these with another polymer or copolymer. The agricultural vinyl chloride resin film of the present invention contains 20 parts by weight of 100 parts by weight of vinyl chloride resin in order to impart flexibility.
-60 parts by weight of commonly used plasticizers are included.

In the agricultural film of the present invention, 1 to 10 parts by weight of trixylyl phosphate is mixed with 100 parts by weight of vinyl chloride resin. The organic phosphoric acid metal salt used in the present invention is a compound represented by the following general formula (I) or (II), and both may be used in combination.

[0009]

[Chemical 3]

(In the formula, R represents an alkyl group or alkenyl group having 10 to 20 carbon atoms, M represents zinc or calcium) Specifically, monoisodecyl phosphate, diisodecyl phosphate, monododecyl phosphate, Examples thereof include zinc salts or calcium salts such as didodecyl phosphate, monohexadecyl phosphate, dihexadecyl phosphate, monooctadecyl phosphate, and dioctadecyl phosphate.

The addition amount of these phosphates is 10
It is 0.1 to 3 parts by weight with respect to 0 parts by weight. In the present invention, magnesium hydroxide having an average particle size of 3 μm or less and hydrotalcites are further blended.
0.5 to 10 per 100 parts by weight of vinyl chloride resin
The content is within the range of 6 parts by weight, and the total amount is 6 to 20 parts by weight.

By using two components having such a specific average particle diameter in specific amounts, the weather resistance is extremely improved. As the hydrotalcites, inorganic substances represented by the following general formula (III) are used. Mg _1-x Al _x (OH) ₂ (CO ₃ ) _{X / 2} · mH ₂ O (III) (where 0 <x <0.5, 0 ≦ m ≦ 2) Specifically, for example, There are many things.

Mg _0.67 Al _0.33 (OH) ₂ (CO ₃ ) _0.165 · 0.5H ₂ O, Mg _0.67 Al _0.33 (OH) ₂ (CO ₃ ) _0.165 · 0.3H ₂ O, Mg _0.67 Al _0.33 (OH) ₂ (CO ₃ ) _0.165 Mg _0.7 Al _0.3 (OH) ₂ (CO ₃ ) _0.15・ 0.5H ₂ O, Mg _0.7 Al _0.3 (OH) ₂ (CO ₃ ) _0.15・ 0.3H ₂ O, Mg _0.7 Al _0.3 (OH) ₂ (CO ₃ ) _0.15 The vinyl chloride resin base material constituting the vinyl chloride resin film for agriculture according to the present invention is used, if necessary, with various ordinary resin additives such as antifogging agents, lubricants, Thermal stabilizers, light stabilizers, antioxidants, UV absorbers, colorants and the like can be included in conventional amounts.

As the antifogging agent, mainly nonionic surfactants, for example, sorbitan monostearate, sorbitan monopalmitate, sorbitan monobehenate and other sorbitan surfactants; glycerin monolaurate,
Glycerin-based surfactants such as diglycerin monopalmitate and glycerin monostearate; polyethylene glycol-based surfactants such as polyethylene glycol monostearate and polyethylene glycol monopalmitate; alkylene oxide adducts of alkylphenols; sorbitan / glycerin condensation Examples thereof include esters of substances and organic acids.

Examples of the lubricant or heat stabilizer include polyethylene wax, liquid paraffin, methylenebis higher fatty acid amide, stearic acid, zinc stearate, aliphatic alcohol, calcium stearate, barium stearate, barium ricinoleate, dibutyltin dilaurate and dibutyl. Examples thereof include tin dimaleate, phenols and β-diketone compounds.

As the light stabilizer, various compounds commonly used in agricultural vinyl chloride films can be used. Specifically, for example, 4-acetoxy-2,2,
6,6-Tetramethylpiperidine, bis (2,2,6,
6-tetramethyl-4-piperidyl) adipate, tris (2,2,6,6-tetramethyl-4-piperidyl)
Examples thereof include hindered amine compounds such as benzene-1,3,5-tricarboxylate and tetrakis (2,2,6,6-tetramethyl-4-piperidyl) propane-1,1,2,3-tetracarboxylate. .

As the antioxidant, 2,6-di-ter is used.
Examples thereof include t-butyl-4-methylphenol, 2,2'-methylenebis (6-tert-butyl-4-ethylphenol), dilaurylthiodipropionate and the like. Examples of the ultraviolet absorber include benzotriazole-based, benzoate-based, benzophenone-based, cyanoacrylate-based, and phenyl salicylate-based ultraviolet absorbers that are generally used for agricultural vinyl chloride-based resin films.

Examples of the colorant include phthalocyanine blue, phthalocyanine green, Hansa yellow, alizarin lake, titanium oxide, zinc white, ultramarine blue, permanent red, quinacridone, carbon black and the like. These resin additives are added in a usual amount, for example, 10 parts by weight per 100 parts by weight of the vinyl chloride resin base material.
It may be included in a small amount of not more than parts by weight.

To the vinyl chloride resin as the base material, trixylyl phosphate, an organic phosphate metal salt, magnesium hydroxide having an average particle size of 3 μm or less and hydrotalcites, and if necessary, various resin additives are added. To mix,
Conventional blending techniques, mixing techniques such as ribbon blenders,
It can be mixed with a Banbury mixer, a super mixer, or other compounding machine mixer. To form the vinyl chloride resin into a film, a method known per se, for example, a melt extrusion method, a solution casting method, a calender method or the like may be adopted.

If the thickness of the agricultural vinyl chloride resin film according to the present invention is too thin, the strength is insufficient and it is not preferable. On the contrary, if it is too thick, a film forming operation and subsequent handling (cut the film into a house type) Including the work of joining to the house, the work of spreading it in the house, etc.)
The range of 0.03 to 0.2 mm is preferable.

[0021]

The reason for the vinyl chloride resin film for agriculture according to the present invention is not clear, but the weather resistance is remarkably improved as compared with the case where the phosphate ester alone is blended.
It is suitable for institutional cultivation of plants useful as an agricultural film.

[0022]

EXAMPLES The present invention will be described in detail below based on examples, but the present invention is not limited to the following examples as long as the gist thereof is not exceeded.

Examples 1 to 4, Comparative Examples 1 to 6 Polyvinyl chloride (bar P = 1300) 100 parts by weight Dioctyl phthalate 42 〃 Epoxy resin (trade name Epicoat 828, 4 〃 Shell Chemical) Calcium-zinc system liquid stable Agent 3 〃 Calcium-zinc powder stabilizer 1.5 〃 Sorbitan monopalmitate 1.5 〃 Benzophenone ultraviolet absorber 0.1 〃 Basic composition, and various additions of the types and amounts shown in Table 1 The agents were blended respectively. 2-hydroxy-4-n-octoxybenzophenone was used as the benzophenone-based ultraviolet absorber.

The above mixture was supplied to a calender roll heated to 180 ° C. and kneaded, and then 10 kinds of film having a thickness of 0.1 mm were prepared by a conventional method. The above 10 kinds of films were exposed outdoors to a closed-type house having a south surface of 45 degrees, and the weather resistance was evaluated by visual observation, and the results shown in Table 2 were obtained. Further, the impact strength of the above 10 kinds of films after outdoor exposure was measured by a puncture tester manufactured by Toyo Seiki Co., Ltd., and the results are shown in Table 2.

[0025]

[Table 1]

[0026]

[Table 2]

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification number Internal reference number FI technical display location C08K 5/521 5/524 KHX (56) Reference JP-A-3-162439 (JP, A) Kaihei 3-157437 (JP, A) JP 1-256553 (JP, A) JP 2-272048 (JP, A) JP 2-272045 (JP, A) JP 2-28236 ( JP, A) JP 3-215562 (JP, A) JP 53-106748 (JP, A) JP 60-219248 (JP, A) JP 62-121750 (JP, A) JP 64-79244 (JP, A) JP-A-62-4067 (JP, A)

Claims (1)

[Claims] 1. To 100 parts by weight of a vinyl chloride resin, 1 to 10 parts by weight of trixylyl phosphate, and an organic phosphoric acid metal salt represented by the following general formula (I) or (II) are added.
1 to 3.0 parts by weight, 0.5 to 10 parts by weight of magnesium hydroxide having an average particle size of 3 μm or less, and 0.5 parts of hydrotalcites represented by the following general formula (III) having an average particle size of 3 μm or less. A vinyl chloride resin film for agricultural use, which comprises a composition containing 10 to 10 parts by weight of magnesium hydroxide and hydrotalcites in a total amount of 6 to 20 parts by weight. [Chemical 1] (In the formula, R is an alkyl group or alkenyl group having 10 to 20 carbon atoms, M is zinc or calcium, and x and m are
0 <x <0.5 and 0 ≦ m ≦ 2. )