CN103213363A - Agricultural film - Google Patents

Agricultural film Download PDF

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Publication number
CN103213363A
CN103213363A CN2013100875507A CN201310087550A CN103213363A CN 103213363 A CN103213363 A CN 103213363A CN 2013100875507 A CN2013100875507 A CN 2013100875507A CN 201310087550 A CN201310087550 A CN 201310087550A CN 103213363 A CN103213363 A CN 103213363A
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CN
China
Prior art keywords
parts
film
part
low density
average molecular
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CN2013100875507A
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Chinese (zh)
Inventor
朱义珍
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朱义珍
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Priority to CN2013100875507A priority Critical patent/CN103213363A/en
Publication of CN103213363A publication Critical patent/CN103213363A/en

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Abstract

The invention discloses an agricultural film comprising multiple layers of film. The agricultural film is characterized in that at least one outer film consists of the following components by weight: 10-20 parts of poly lactic acid, 10-20 parts of polycaprolactone, 20-30 parts of linear chain low density polyethylene, 40-50 parts of polypropylene and 1-5 parts of a shading agent; and the inner film is composed of the following components by weight: 50-60 parts of polypropylene, 15-25 parts of ethylene-vinyl acetate copolymer and 30-40 parts of low density polyethylene. The agricultural film provided by the invention can effectively shade light to prevent crops from strong sunlight transmission; at the same time, the agricultural film is added with biodegradable material to improve the degradation properties of the film and reduce the plastic film residue and debris in soil.

Description

A kind of agricultural film

Technical field

The invention belongs to agricultural technology field, relate generally to the agricultural film.

Background technology

The main component of Farm mulch is polyethylene or polypropylene, is the present plastic products of output maximum in the world.The use of plastic sheeting for farm use helps growing of crop, improves crop yield.Yet the increase of plastic sheeting for farm use use amount and refractory organics thereof make in the soil residual film and fragment thereof increase, and cause soil compaction, permeability variation, cause crop production reduction, and its difficult property that reclaims causes it to discard at occurring in nature, and is very big to ecological environment harm.For the crop of cultivating in the film booth in agricultural, exist if the sunray of transmission is strong excessively, can be to dysgenic situation such as burn as deposits yields.

Summary of the invention

For solving the deficiencies in the prior art, the object of the present invention is to provide a kind of agricultural film, can play effect to the crops shading, have good degradation property simultaneously.

In order to realize above-mentioned target, the present invention adopts following technical scheme:

A kind of agricultural is used film, comprises multilayer film, it is characterized in that: the outer membrane of one deck is made up of following parts by weight component at least: PLA 10-20 part, polycaprolactone 10-20 part, straight-chain low density polyethylene 20-30 part, polypropylene 40-50 part, opacifier 1-5 part; Inner layer film is made up of following parts by weight component: polypropylene 50-60 part, vinyl-vinyl acetate copolymer 15-25 part, low density polyethylene (LDPE) 30-40 part.

Aforementioned outer membrane can also be made up of following parts by weight: PLA-polycaprolactone copolymer 25-35 part, straight-chain low density polyethylene 30-40 part, polypropylene 55-65 part, opacifier 1-5 part.

Aforementioned opacifier is a kind of in titanium dioxide or the carbon black.

The number-average molecular weight of aforementioned PLA is 50000-80000; The number-average molecular weight of aforementioned polycaprolactone is 50000-80000; The number-average molecular weight of aforementioned linear low density polyethylene (LDPE) is 10000-20000; Aforementioned polyacrylic number-average molecular weight is 8500-10000; The number-average molecular weight of aforementioned low density polyethylene (LDPE) is 10000-20000.

The mass content of vinyl acetate is 25~35% in the aforementioned vinyl-vinyl acetate copolymer, and the number-average molecular weight of vinyl-vinyl acetate copolymer is 30000-50000.

Aforementioned PLA-polycaprolactone copolymer is a random copolymer, and number-average molecular weight is 80000-100000.

Usefulness of the present invention is: agricultural film provided by the invention, and effectively shading makes crops avoid by the too strong transmission of sunshine, simultaneously, add degradable material, improved the degradation property of film, reduced residual film and the fragment in the soil.

The specific embodiment

Below in conjunction with specific embodiment the present invention is done concrete introduction.

Among embodiment 1-5 and the Comparative Examples 1-2, the number-average molecular weight of PLA is 50000-80000; The number-average molecular weight of polycaprolactone is 50000-80000; The number-average molecular weight of straight-chain low density polyethylene is 10000-20000; Polyacrylic number-average molecular weight is 8500-10000; The mass content of vinyl acetate is 25~35% in the vinyl-vinyl acetate copolymer, and the number-average molecular weight of vinyl-vinyl acetate copolymer is 30000-50000; The number-average molecular weight of low density polyethylene (LDPE) is 10000-20000; PLA-polycaprolactone copolymer is a random copolymer, and number-average molecular weight is 80000-100000.

Embodiment 1:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 10 parts of PLAs, 10 parts of polycaprolactones, 20 parts of straight-chain low density polyethylenes, 40 parts of polypropylene, 2 parts of titanium dioxide; Inner layer film is made up of following parts by weight component: 50 parts of polypropylene, 15 parts of vinyl-vinyl acetate copolymers, 30 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Embodiment 2:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 15 parts of PLAs, 15 parts of polycaprolactones, 25 parts of straight-chain low density polyethylenes, 45 parts of polypropylene, 5 parts of titanium dioxide; Inner layer film is made up of following parts by weight component: 55 parts of polypropylene, 20 parts of vinyl-vinyl acetate copolymers, 35 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Embodiment 3:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 20 parts of PLAs, 20 parts of polycaprolactones, 30 parts of straight-chain low density polyethylenes, 50 parts of polypropylene, 3 parts of carbon blacks; Inner layer film is made up of following parts by weight component: 60 parts of polypropylene, 25 parts of vinyl-vinyl acetate copolymers, 40 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Embodiment 4:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 25 parts of PLAs-polycaprolactone copolymer, 30 parts of straight-chain low density polyethylenes, 55 parts of polypropylene, 4 parts of titanium dioxide; Inner layer film is made up of following parts by weight component: 56 parts of polypropylene, 22 parts of vinyl-vinyl acetate copolymers, 37 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Embodiment 5:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 35 parts of PLAs-polycaprolactone copolymer, 40 parts of straight-chain low density polyethylenes, 65 parts of polypropylene, 1 part of carbon black; Inner layer film is made up of following parts by weight component: 52 parts of polypropylene, 16 parts of vinyl-vinyl acetate copolymers, 33 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Comparative Examples 1:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 45 parts of straight-chain low density polyethylenes, 55 parts of polypropylene, 3 parts of titanium dioxide; Inner layer film is made up of following parts by weight component: 52 parts of polypropylene, 18 parts of vinyl-vinyl acetate copolymers, 35 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Comparative Examples 2:

A kind of agricultural film, the outer membrane of one deck is made up of following parts by weight component at least: 18 parts of PLAs, 18 parts of polycaprolactones, 26 parts of straight-chain low density polyethylenes, 44 parts of polypropylene; Inner layer film is made up of following parts by weight component: 58 parts of polypropylene, 25 parts of vinyl-vinyl acetate copolymers, 40 parts of low density polyethylene (LDPE)s.Outer membrane and inner layer film are fed intake by proportioning respectively, and through extruding, inflation obtains each layered membrane after the traction, more inside and outside tunic is passed through the heat seal machine, is being bonded to multilayer agricultural film after 120 ℃ of a period of times of heating under the pressurized 0.15MPa condition.

Embodiment 1-5 and Comparative Examples 1-2 carry out following test:

Degradation experiment: the initial film quality is designated as m1, and film is embedded in the soil and takes out weighing after 90 days, and quality is designated as m2, and mass loss rate (%) is (m1-m2)/m1;

Hot strength, elongation at break: according to the ASTMD-882 standard testing;

Shading rate: test according to transmission case method.

Listed the test result of embodiment 1-5 and Comparative Examples 1-2 in the table 1.

The test result of table 1 embodiment 1-5 and Comparative Examples 1-2

By learning in the table 1, when embodiment 1-5 has kept the good mechanical performance,, had good degradation property with respect to general thin Comparative Examples 1, effectively reduced residual-film amount.In addition, embodiment 1-5 compares with Comparative Examples 2 and also has shading performance preferably.

More than show and described basic principle of the present invention, principal character and advantage.The technical staff of the industry should understand, and the foregoing description does not limit the present invention in any form, and all employings are equal to the technical scheme that mode obtained of replacement or equivalent transformation, all drop in protection scope of the present invention.

Claims (6)

1. an agricultural is used film, comprises multilayer film, and it is characterized in that: the outer membrane of one deck is made up of following parts by weight component at least: PLA 10-20 part, polycaprolactone 10-20 part, straight-chain low density polyethylene 20-30 part, polypropylene 40-50 part, opacifier 1-5 part; Inner layer film is made up of following parts by weight component: polypropylene 50-60 part, vinyl-vinyl acetate copolymer 15-25 part, low density polyethylene (LDPE) 30-40 part.
2. a kind of agricultural film according to claim 1, it is characterized in that: described outer membrane can also be made up of following parts by weight: PLA-polycaprolactone copolymer 25-35 part, straight-chain low density polyethylene 30-40 part, polypropylene 55-65 part, opacifier 1-5 part.
3. a kind of agricultural according to claim 1 and 2 is used film, it is characterized in that: described opacifier is a kind of in titanium dioxide or the carbon black.
4. a kind of agricultural according to claim 1 and 2 is used film, it is characterized in that: the number-average molecular weight of described PLA is 50000-80000; The number-average molecular weight of described polycaprolactone is 50000-80000; The number-average molecular weight of described straight-chain low density polyethylene is 10000-20000; Described polyacrylic number-average molecular weight is 8500-10000; The number-average molecular weight of described low density polyethylene (LDPE) is 10000-20000.
5. a kind of agricultural according to claim 1 is used film, it is characterized in that: the mass content of vinyl acetate is 25 ~ 35% in the described vinyl-vinyl acetate copolymer, and the number-average molecular weight of vinyl-vinyl acetate copolymer is 30000-50000.
6. a kind of agricultural according to claim 2 is used film, it is characterized in that: described PLA-polycaprolactone copolymer is a random copolymer, and number-average molecular weight is 80000-100000.
CN2013100875507A 2013-03-19 2013-03-19 Agricultural film CN103213363A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103951884A (en) * 2014-04-12 2014-07-30 安徽江威精密制造有限公司 High-temperature stable metallized thin film used for capacitors, and preparation method thereof
CN105131629A (en) * 2015-09-08 2015-12-09 沈阳化工大学 Degraded mulch film containing nanometer level TiO2 photocatalysis, water, oxidation and biological degradation technologies
CN106905597A (en) * 2017-03-20 2017-06-30 兰州鑫银环橡塑制品有限公司 A kind of compound Wholly-degradable material and preparation method thereof
CN106982683A (en) * 2017-03-20 2017-07-28 兰州鑫银环橡塑制品有限公司 A kind of Techniques in Dry-farming Areas biodegradable material and preparation method thereof
CN107018827A (en) * 2017-03-20 2017-08-08 兰州鑫银环橡塑制品有限公司 A kind of environment whole degrading film material and preparation method thereof

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316847A (en) * 1989-10-05 1994-05-31 Biodata Oy Biologically degradable films comprising enzyme-coated bio-degradable polymer particles
WO1998055297A1 (en) * 1997-06-06 1998-12-10 Petoskey Plastics, Inc Plastic masking cover
WO2004000939A1 (en) * 2002-06-20 2003-12-31 Toray Industries, Inc. Polylactic acid base polymer composition, molding thereof and film
CN1681650A (en) * 2002-09-16 2005-10-12 陶氏环球技术公司 High clarity, high stiffness films
CN101007302A (en) * 2006-01-25 2007-08-01 Jts株式会社 Light-scattering composite agricultural film
CN102555369A (en) * 2010-12-09 2012-07-11 财团法人工业技术研究院 Gas-barrier heat-seal composite films and vacuum insulation panels comprising the same

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5316847A (en) * 1989-10-05 1994-05-31 Biodata Oy Biologically degradable films comprising enzyme-coated bio-degradable polymer particles
WO1998055297A1 (en) * 1997-06-06 1998-12-10 Petoskey Plastics, Inc Plastic masking cover
WO2004000939A1 (en) * 2002-06-20 2003-12-31 Toray Industries, Inc. Polylactic acid base polymer composition, molding thereof and film
CN1681650A (en) * 2002-09-16 2005-10-12 陶氏环球技术公司 High clarity, high stiffness films
CN101007302A (en) * 2006-01-25 2007-08-01 Jts株式会社 Light-scattering composite agricultural film
CN102555369A (en) * 2010-12-09 2012-07-11 财团法人工业技术研究院 Gas-barrier heat-seal composite films and vacuum insulation panels comprising the same

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103951884A (en) * 2014-04-12 2014-07-30 安徽江威精密制造有限公司 High-temperature stable metallized thin film used for capacitors, and preparation method thereof
CN105131629A (en) * 2015-09-08 2015-12-09 沈阳化工大学 Degraded mulch film containing nanometer level TiO2 photocatalysis, water, oxidation and biological degradation technologies
CN106905597A (en) * 2017-03-20 2017-06-30 兰州鑫银环橡塑制品有限公司 A kind of compound Wholly-degradable material and preparation method thereof
CN106982683A (en) * 2017-03-20 2017-07-28 兰州鑫银环橡塑制品有限公司 A kind of Techniques in Dry-farming Areas biodegradable material and preparation method thereof
CN107018827A (en) * 2017-03-20 2017-08-08 兰州鑫银环橡塑制品有限公司 A kind of environment whole degrading film material and preparation method thereof

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Effective date of abandoning: 20160323