JP6108899B2 - Biodegradable house tunnel film - Google Patents

Description

  The present invention relates to a biodegradable house tunnel film, and more particularly, to a biodegradable agricultural house tunnel film having transparency, weather resistance, and breakage resistance.

  Agricultural and horticultural films are used for cultivation of agricultural and horticultural crops, and are used for house, tunnel and mulch applications. The film for a house is used as a covering material in an agricultural and horticultural facility (for example, a vinyl house or a green house) assembled with a wooden or steel material as a housing. Basically, a film for a house is generally required to have transparency and heat retention.

  The tunnel film is used as a covering material in a medium-sized facility having a house facility. Tunnel films are generally used for various purposes such as keeping warm at night and preventing cold damage; avoiding frost, hail, hail, hail, and the like. Moreover, since the film for houses and the film for tunnels are often stretched, weather resistance and damage resistance are required.

  In recent years, biodegradable multifilms have been developed for the purpose of labor saving in farm work, prevention of global warming, and prevention of air and soil contamination (Patent Document 1: JP 2000-342083 A). However, the biodegradable multi-film uses a biodegradable component, so it has transparency and transparency compared to conventional agricultural films (agricultural vinyl film, agricultural polyethylene film, agricultural polyolefin special film). It was considered to be inferior in weather resistance, and it was difficult to divert it to a biodegradable house / tunnel film that was repeatedly stretched.

  On the other hand, in patent document 1 (Unexamined-Japanese-Patent No. 2007-284595), the film for agricultural houses formed with the specific aliphatic polyester film which has biodegradability, mechanical strength, and water vapor | steam barrier property. Has been proposed.

  However, in the prior art document, although a degradable house film using a biodegradable component has been proposed, a film for a biodegradable house tunnel having all of transparency, weather resistance and breakage resistance. The development of is not yet fully developed. Therefore, it is still a biodegradable house that achieves excellent transparency, weather resistance and breakage resistance at a high level in consideration of the types of agricultural and horticultural crops, cultivation period, climate, agricultural use (expansion), etc. Development of tunnel films is required.

  In the film for biodegradable house / tunnel, the present inventors added a specific cross-linking agent, ultraviolet absorber and light stabilizer to the biodegradable component, thereby providing excellent transparency when cultivating agricultural and horticultural crops. We obtained the knowledge that the film for house tunnel can be decomposed and processed naturally (in soil) after cultivation, while realizing the properties, weather resistance and breakage resistance. The present invention has been made based on such knowledge.

  Therefore, the present invention is provided with biodegradability and has the desired performance required for a film for house tunnel, that is, transparency, weather resistance and breakage resistance. The present invention provides a biodegradable multi-film for house tunnels.

Therefore, according to the present invention, a biodegradable film for a house tunnel,
Biodegradable ingredients,
A carbodiimide compound or an acrylic styrene resin as a crosslinking agent,
A cyanoacrylate-based ultraviolet absorber, and
A biodegradable film for a house tunnel composed of a hindered amine light stabilizer is proposed.

In the present invention, by employing a carbodiimide compound or an acrylic styrene resin as a crosslinking agent, it becomes possible to suppress hydrolyzability in the film and improve water resistance. By adopting a cyanoacrylate ultraviolet absorber and a hindered amine light stabilizer, it becomes possible to improve the weather resistance of the film without impairing the growth of agricultural and horticultural crops. In particular, by combining these, it is possible to exert a synergistic effect that is greater than the effect of the single device.
Therefore, according to the biodegradable film for house tunnel according to the present invention, after the cultivation of various agricultural and horticultural crops, when it is naturally decomposed, the transparency required for the film for house tunnel, It becomes possible to achieve weather resistance and breakage resistance in a high dimension.

FIG. 1 is a schematic view of a test piece B punched from the test piece A in the examples.

Detailed Description of the Invention

I. Biodegradable House Tunnel Film The biodegradable house tunnel film according to the present invention (hereinafter sometimes simply referred to as “film”) includes a specific cross-linking agent, an ultraviolet absorber, and light. It is formed by adding a stabilizer.

1) Crosslinking agent In the present invention, a carbodiimide compound or an acrylic styrene resin is used as a crosslinking agent.
Carbodiimide compound In the present invention, a carbodiimide compound means a compound (including a polymer) having a basic structure: -N = C = N- and a modified product (substitution, functionalization, etc.) thereof. .
The carbodiimide compound is preferably selected from the viewpoints of reactivity with biodegradable components, storage stability, and the like. Specific examples of the carbodiimide compound include one selected from the group consisting of dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, diphenylcarbodiimide, and naphthylcarbodiimide, or a combination of two or more thereof. Preferably, it is a dicyclohexyl carbodiimide type compound. As the carbodiimide compound, a commercially available product can be used, and for example, Carbodilite series LA-1 (manufactured by Nisshinbo Chemical Co., Ltd.) can be used.

  The carbodiimide compound (crosslinking agent) is 0.3 parts by mass or more and 5.0 parts by mass or less, preferably 0.5 parts by mass or more when the addition amount of the biodegradable component is 100 parts by mass. And the upper limit may be added at 2.0 parts by mass or less. By making it the said addition amount, suppression of hydrolysis is fully exhibited, and especially, the influence of a crosslinking residue can be suppressed and promotion of hydrolysis can be prevented.

Acrylic styrene-based resin As the acrylic styrene-based resin (crosslinking agent), a copolymer of acrylonitrile and styrene is generally used, and a resin into which a substituent or a modifying group such as an epoxy group is introduced may be used. Examples of the acrylic monomer having an epoxy group include glycidyl methacrylate, glycidyl acrylate, (3,4-epoxycyclohexyl) methyl methacrylate, (3,4-epoxycyclohexyl) methyl acrylate, and the like. Examples of the styrenic monomer include styrene, α-methylstyrene, t-butylstyrene, chlorostyrene, and the like. A monomer other than an acrylic monomer having an epoxy group and a styrene monomer may be contained as a constituent monomer component. Examples of such a monomer include methyl acrylate, ethyl acrylate, and propyl. Examples include acrylate, butyl acrylate, 2-ethylhexyl acrylate, cyclohexyl acrylate, methyl methacrylate, ethyl methacrylate, propyl methacrylate, butyl methacrylate, 2-ethylhexyl methacrylate, cyclohexyl methacrylate, and the like.
In the present invention, a commercially available product can be used as the acrylic styrene resin, for example, Alfon UG series UG4040 (manufactured by Toagosei Co., Ltd.) can be used.

  The acrylic styrene-based resin is 0.2 parts by mass or more and 5.0 parts by mass or less when the addition amount of the biodegradable component is 100 parts by mass, and preferably has a lower limit of 0.5 parts by mass or more. The upper limit value is 2.0 parts by mass or less. By adding in the above-mentioned addition amount, the physical properties of the film can be kept constant and the hydrolysis can be sufficiently suppressed, so that the damage of the film due to the hydrolysis can be suppressed. In particular, when the acrylic styrene-based resin contains an epoxy group, the reaction between the epoxy group and moisture can be suppressed, and the physical properties of the film can be maintained.

2) Cyanoacrylate UV Absorber In the present invention, a cyanoacrylate UV absorber is included. By adopting a cyanoacrylate ultraviolet absorber, the weather resistance of the film can be improved without impairing the growth of agricultural and horticultural crops.
In general, the cyanoacrylate-based ultraviolet absorber has an ultraviolet absorption wavelength peak in a low wavelength region, and specific examples thereof include 2-ethylhexyl 2-cyano-3, 3-diphenylacrylate, ethyl 2- Cyano-3,3-diphenyl acrylate, hexadecyl 2-cyano-3- (4-methylphenyl) acrylate, 2-cyano-3- (4-methylphenyl) acrylate, 1,3-bis (2′-cyano) -3,3'-diphenylacryloyl) oxy) -2,2-bis (((2'-cyano-3,3'-diphenylacryloyl) oxy) methyl) propane and the like, or one of these Two or more types of combinations can be mentioned. Preferably, 1,3-bis (2′-cyano-3,3′-diphenylacryloyl) oxy) -2,2-bis (((2′-cyano-3,3′-diphenylacryloyl) oxy) methyl) Propane. As the cyanoacrylate ultraviolet absorber, a commercially available product can be used, and for example, ubinal 3030 (manufactured by BASF) can be used.

  The cyanoacrylate-based UV absorber is 0.1 parts by mass or more and 0.5 parts by mass or less, preferably 0.1 parts by mass or more when the addition amount of the biodegradable component is 100 parts by mass. Yes, the upper limit is added at 0.3 parts by mass or less. By adding in the above-mentioned addition amount, sufficient weather resistance can be obtained without deteriorating the physical properties of the film.

3) Hindered amine light stabilizer The present invention comprises a hindered amine light stabilizer. By using a hindered amine light stabilizer, the oxidation reaction in the film can be suppressed and the weather resistance can be improved. Deterioration can be suppressed.

  Specific examples of the hindered amine light stabilizer include 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / dibromoethane polycondensate, 1,6-bis (2,2 , 6,6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4 -Piperidylamino) hexane / 2,4-dichloro-6-octylamino-s-triazine polycondensate, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2 , 6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis [2,4- Bis (N-butyl-N- (1, , 2,6,6-pentamethyl-4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-ylaminoundecane and 1,6 (1,2,2,6,6 -Pentamethyl-4-piperidyl) amino) -s-triazin-6-ylaminoundecane, 1,6-hexanediamine-N, N'-bis (2,2,6,6-tetramethyl-4-piperidyl) Polycondensate with morpholine-2,4,6-trichloro-1,3,5-triazine, poly [(6-morpholino-s-triazine-2,4-diyl) [(2,2,6,6 , -Tetramethyl-4-piperidyl) imi ] - one or two or more thereof selected from the group consisting of hexamethylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]] and the like. These are examples of hindered amine light stabilizers, and one kind of known hindered amine light stabilizers or a combination of two or more of these may be used. Preferably, 1,6-hexanediamine-N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl) and morpholine-2,4,6-trichloro-1,3,5- It is a polycondensate with triazine. A commercially available product can be used as the hindered amine light stabilizer, and for example, UV-3529 (manufactured by Cytec Corporation) can be used.

  The hindered amine light stabilizer is 0.1 parts by mass or more and 2.0 parts by mass or less, and preferably has a lower limit of 0.3 parts by mass or more when the addition amount of the biodegradable component is 100 parts by mass. The upper limit value is 1.0 parts by mass or less. By adding at the above-mentioned addition amount, the physical properties of the film can be maintained, in particular, the bloom of the film can be suppressed, the whitening of the film can be prevented, and sufficient weather resistance can be imparted to the film.

The biodegradable component The biodegradable component may be any material as long as the biodegradable house / tunnel film is biodegradable in the soil, but is basically a component configured as a film. It is preferable that The biodegradable component is preferably a biodegradable resin, specifically, a chemically synthesized biodegradable resin, a microbial biodegradable resin, a natural biodegradable resin, or these Or a combination of two or more of these.

  Examples of chemically synthesized biodegradable resins include polyester resins, polyvinyl alcohol (PVA), and polyglycolic acid. Preferable specific examples of polyester resins include aliphatic polyester resins, aromatic polyester resins, or combinations of two or more thereof.

  Specific examples of the aliphatic polyester resin include polylactic acid (PLA), polylactic acid / diol carboxylic acid / dicarboxylic acid copolymer, polybutylene succinate (PBS), poly (butylene succinate / adipate) (PBS / A). ), Poly (butylene succinate-co-adipate) (PBS / A), poly (caprolactone butylene succinate), polycaprolactone (PCL), poly (butylene succinate / carbonate) (PEC), polyethylene succinate (PES) And one or a combination of two or more selected from the group consisting of polyethylene succinate adipate copolymers.

  Specific examples of aromatic polyester resins include poly (butylene adipate / terephthalate) (PBAT), poly (tetramethylene adipate / terephthalate), poly (butylene adipate-co-terephthalate), poly (ethylene terephthalate / succinate) (CPE). ) And poly (ethylene terephthalate copolymer) (CPE), or a combination of two or more thereof.

  Specific examples of microbial biodegradable resins include poly-3-hydroxybutyric acid (PHB), poly (3-hydroxybutyrate-co-3-hydroxyhexanoate), poly (3-hydroxybutyrate- Examples include one or a combination of two or more selected from the group consisting of co-3-hydroxyhexanoate (PHBH), polyhydroxyalkanoate (PHA), and maltotriose.

  Specific examples of the natural product-based biodegradable resin include one kind selected from the group consisting of starch fatty acid ester, starch polyester, cellulose acetate, and chitosan, or a combination of two or more thereof.

4) Optional additives In the present invention, in order to achieve a desired function, a mixed preparation agent (physical property stabilizer), a drip-proof agent, a heat stabilizer, an antioxidant, a lubricant, Appropriate amounts of viscosity modifiers, dispersants, emulsifiers and the like can be added. Specific examples of heat stabilizers and antioxidants include chelators such as metal salts of carboxylic acids, phenolic antioxidants, and organic phosphites. Specific examples of the lubricant include saturated fatty acid amides such as stearic acid amide, unsaturated fatty acid amides such as erucic acid amide and oleic acid amide, and bisamides such as ethylene bis stearic acid amide.
In the present invention, it is preferable to add a drip-proofing agent.

Mixed preparation agent (physical property stabilizer)
In the present invention, it is preferable to use polybutylene terephthalate as a mixing preparation agent. If the initial physical properties of the film are good and the effect of the additive can be enhanced, it is possible to impart flexibility to the film within a range acceptable as a coating material.
Polybutylene terephthalate is 0.5 parts by mass or more and 3.0 parts by mass or less when the addition amount of the biodegradable component is 100 parts by mass.

Drip-proofing agent In the present invention, preferably a drip-proofing agent can be added. The drip-proofing agent mainly suppresses the generation of bloom and can prevent whitening of the film surface.
Specific examples of the anti-drip agent include sorbitan fatty acid ester, sorbitol fatty acid ester, glycerin fatty acid ester, diglycerin fatty acid ester, sorbitan fatty acid / dibasic acid ester, glycerin fatty acid / dibasic acid ester, diglycerin fatty acid / dibasic acid ester And esters of polyhydric alcohols such as fatty acids, esters of polyhydric alcohols with fatty acids and dibasic acids, and compounds obtained by adding alkylene oxides such as ethylene oxide and propylene oxide to these. More specifically, sorbitan palmitate, sorbitan stearate, sorbitan stearate / ethylene oxide 1 mol adduct, sorbitan stearate / ethylene oxide 2 mol adduct, sorbitan stearate / propylene oxide 3 mol adduct, sorbitan stearate・ Ethylene oxide 3 mol adduct, diglycerin palmitate, diglyceryl stearate, glycerin palmitate, glyceryl stearate, glycerine palmitate ・ Ethylene oxide 2 mol adduct, sorbitan stearate adipate ・ Ethylene oxide 3 mol adduct, sorbitol Stearate adipate / ethylene oxide 2 mol adduct, diglycerin palmitate sebacate / propylene oxide 3 mol adduct, sorbitol par Tetoajipeto ethylene oxide 3 may be one or two or more combinations of mole adducts.

  When the addition amount of the biodegradable component is 100 parts by mass, the anti-drip agent is 0.5 parts by mass or more and 3.0 parts by mass or less, and preferably has a lower limit of 1.0 part by mass or more and an upper limit. The value is added at 1.5 parts by mass or less. By adding the anti-drip agent in the above-mentioned addition amount, drip-proof sustainability can be exhibited, and the occurrence of whitening of the film surface can be sufficiently suppressed.

II. Production of Biodegradable House Tunnel Film The biodegradable house tunnel film according to the present invention is produced by mixing the above components to prepare a composition and molding it.
The composition is formed, for example, by blending the above components at a predetermined ratio and using a blender or kneader such as a ribbon blender, a Banbury mixer, a Henschel mixer, a super mixer, a single or twin screw extruder, a roll, etc. Good.
Next, the composition is extruded into a linear shape and cut into a length of several mm to prepare a pellet.
Examples of the film forming method include an inflation method, a T-die method, a calendar method, and the like. For example, in the inflation method, the pellets are supplied to a hopper and heated in a cylinder. Then, the composition is extruded from a die having a narrow annular gap formed in a circular shape, and air is fed into the die to be expanded. Then, a film is formed by cooling and solidifying. Further, for example, in the T-die method, the pellets are charged into a molding extruder, and the melt is extruded from a T-die attached to the tip of the extruder. And a film is formed by making the molten extrudate contact with the cast roll controlled to the temperature of 50 degrees C or less, and cooling. It is common to manufacture by the T-die method.

  The present invention will be described in detail with reference to the following examples, but the scope of the present invention should not be construed as being limited to the examples.

Preparation of Biodegradable House Tunnel Film According to the composition shown in Table 1, a composition for forming a biodegradable house tunnel film was prepared. Using the composition, biodegradable house tunnel films of Examples 1 and 2 and Comparative Examples 1 to 4 were formed using a T-die method. The film thickness of the prepared biodegradable house tunnel film was about 0.075 mm.

Ingredient biodegradable ingredient (PBAT): (BASF, Ecoflex)
Polybutylene terephthalate (PBT): (Duranex manufactured by Polyplastics)
Benzophenone UV absorber: (BASF, Kimassorb 81)
Benzotriazole UV absorber: (BASF, Tinuvin 326)
Cyanoacrylate UV absorber: (BASF, Yubinar 3030)
Hindered amine light stabilizer: (Cytech, UV-3529)
Carbodiimide compound: (Nisshinbo, Carbodilide LA-1)
Acrylic styrene resin: (Alfon UG4040, manufactured by Toa Gosei)

Evaluation was performed according to the following criteria for the agricultural films in the evaluation test examples and comparative examples. The results were as described in Table 2 below.
Evaluation test 1: Transparency (haze value)
About the film of an Example and a comparative example, after setting for 28 months at 28 degreeC, the haze value was measured with the haze meter HGM-2DP (made by Suga Test Instruments). From the measured numerical values, the following criteria were used for evaluation.
Evaluation criteria 1
Evaluation (circle): The haze value was less than 30.
Evaluation Δ: The haze value was 30 or more and less than 50.
Evaluation x: The haze value was 50 or more.

Evaluation test 2: Weather resistance (Sunshine WOM)
About the film of the Example and the comparative example, the tensile fracture was measured according to the weather resistance test method of JIS K 6732.
Specifically, a rectangular test piece A (film length direction: 200 mm × film width direction: 70 mm) is taken from the rolled-up film to determine the irradiation surface, and the test piece A is subjected to light resistance and weather resistance by the sunshine carbon arc lamp type. Mounted with a slack on the holding frame of the testing machine (I Super UV Tester, Iwasaki Denki), black panel temperature 63 ° C ± 2 ° C, UV light 80mw / cm ² , spray (cycle: 12 minutes spray per hour) ) For 400 hours.
After that, the test piece B of FIG. 1 is punched out from the test piece A, the test piece B is marked at 20 mm on both sides from the center, and left at 23 ± 2 ° C. for 1 hour or more. B was accurately attached to a tensile tester (Shopper type tensile tester, manufactured by Ueshima Seisakusho). The test speed was 200 ± 20 mm per minute. About the test piece B, the distance between marked lines when the test piece B cut | disconnected was measured, and elongation was measured.
Moreover, the test piece B of FIG. 1 was created also from the unirradiated film which was not irradiated with the sunshine carbon arc lamp type light resistance and weather resistance tester, and the elongation was measured by the same method as the test piece B after irradiation.
The residual elongation rate was calculated as follows from the elongation of the test piece after irradiation and the elongation of the unirradiated test piece. Based on the calculated values, the evaluation was made according to the following criteria.
Calculation method N1: Tensile elongation at break of unirradiated specimen N2: Tensile elongation at break of specimen after irradiation
Residual elongation (%) = N2 / N1 × 100
Evaluation criteria 2
Evaluation (circle): Sunshine WOM was 70% or more.
Evaluation Δ: Sunshine WOM was 30% or more and less than 70%.
Evaluation x: Sunshine WOM was less than 30%.

Evaluation test 3: Biodegradability (weight retention)
About the film of an Example and a comparative example, the test piece was embed | buried in the depth of about 5 cm on the conditions with an average temperature of 15 degreeC or more, and the weight retention after 6 months was measured (soil embedding method). The weight of the test piece before embedding and the weight of the test piece after embedding were measured and calculated as follows. Based on the calculated values, the evaluation was made according to the following criteria.
Calculation method W1: Weight of test piece before embedding W2: Weight of test piece after embedding Weight retention rate (%) = W2 / W1 × 100
Evaluation criteria 3
Evaluation ○: The weight retention was less than 50%.
Evaluation Δ: Weight retention was 50% or more and less than 90%.
Evaluation x: The weight retention was 90% or more.

Claims (8)

A biodegradable film for house tunnels,
Biodegradable ingredients,
A carbodiimide compound or an acrylic styrene resin as a crosslinking agent,
A cyanoacrylate-based ultraviolet absorber, and
Ri Na is composed of a hindered amine light stabilizer,
When the addition amount of the biodegradable component is 100 parts by mass, the cyanoacrylate ultraviolet absorber is added in an amount exceeding 0.1 parts by mass and 0.5 parts by mass or less . the film.   The biodegradable house tunnel according to claim 1, wherein the cross-linking agent is added in an amount of 0.5 parts by mass or more and 2.0 parts by mass or less when the addition amount of the biodegradable component is 100 parts by mass. Film. When the addition amount of the biodegradable component is 100 parts by mass, the cyanoacrylate ultraviolet absorber is 0 . 2 parts by mass or more 0 . The biodegradable house tunnel film according to claim 1 or 2, which is added in an amount of 5 parts by mass or less.   When the addition amount of the biodegradable component is 100 parts by mass, the hindered amine light stabilizer is added in an amount of 0.3 parts by mass or more and 1.0 part by mass or less. The biodegradable house tunnel film according to one item.   The carbodiimide compound is one or a combination of two or more selected from the group consisting of dicyclohexylcarbodiimide, diisopropylcarbodiimide, dimethylcarbodiimide, diisobutylcarbodiimide, dioctylcarbodiimide, diphenylcarbodiimide, and naphthylcarbodiimide. 5. The biodegradable house tunnel film according to any one of 4 above.   The cyanoacrylate-based ultraviolet absorber is 2-ethylhexyl 2-cyano-3,3-diphenyl acrylate, ethyl 2-cyano-3,3-diphenyl acrylate, hexadecyl 2-cyano-3- (4-methylphenyl) acrylate, 2-cyano-3- (4-methylphenyl) acrylate, 1,3-bis (2′-cyano-3,3′-diphenylacryloyl) oxy) -2,2-bis (((2′-cyano The biodegradability according to any one of claims 1 to 5, which is one or a combination of two or more selected from the group consisting of -3,3'-diphenylacryloyl) oxy) methyl) propane and the like. House tunnel film.   The hindered amine light stabilizer is 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) hexane / dibromoethane polycondensate, 1,6-bis (2,2,6, 6-tetramethyl-4-piperidylamino) hexane / 2,4-dichloro-6-morpholino-s-triazine polycondensate, 1,6-bis (2,2,6,6-tetramethyl-4-piperidylamino) ) Hexane / 2,4-dichloro-6-octylamino-s-triazine polycondensate, 1,5,8,12-tetrakis [2,4-bis (N-butyl-N- (2,2,6, 6-tetramethyl-4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,5,8,12-tetrakis [2,4-bis (N -Butyl-N- (1,2,2,6 6-pentamethyl-4-piperidyl) amino) -s-triazin-6-yl] -1,5,8,12-tetraazadodecane, 1,6,11-tris [2,4-bis (N-butyl-) N- (2,2,6,6-tetramethyl-4-piperidyl) amino) -s-triazin-6-ylaminoundecane and 1,6 (1,2,2,6,6-pentamethyl-4- Piperidyl) amino) -s-triazin-6-ylaminoundecane, 1,6-hexanediamine-N, N′-bis (2,2,6,6-tetramethyl-4-piperidyl) and morpholine-2, Polycondensate with 4,6-trichloro-1,3,5-triazine, poly [(6-morpholino-s-triazine-2,4-diyl) [(2,2,6,6, -tetramethyl- 4-piperidyl) imino] -hex It is 1 type selected from the group which consists of methylene [(2,2,6,6-tetramethyl-4-piperidyl) imino]], or a combination of two or more types, The method according to any one of claims 1 to 6. Biodegradable film for house tunnel. The biodegradable house tunnel film according to any one of claims 1 to 7, wherein the chemically synthesized biodegradable resin is a polyester resin.

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