CN104559087A - Controllable bio-based full-degradable mulching film - Google Patents
Controllable bio-based full-degradable mulching film Download PDFInfo
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Abstract
The invention discloses a controllable bio-based full-degradable mulching film which is prepared from the following raw materials in parts by weight: 15-60 parts of polylactic acid (PLA), 40-85 parts of polyterephthalic acid-butanediol adipate, 0.1-0.5 part of reactive assistant, 0.1-0.5 part of antioxidant, 0.1-0.5 part of lubricant, 0.1-0.5 part of ultraviolet absorbent and 0.1-0.5 part of light stabilizer. The novel reactive assistant is adopted to solve the problem of interface compatibility between PLA and PBAT; by adjusting the PLA/PBAT proportion and adding other ultraviolet absorbents and light stabilizers, the problem of controllability on mulching film degradation period is solved; and by utilizing the characteristic of high mechanical strength of the PLA in combination with favorable flexibility of the PBAT, the controllable-degradation-period full-biodegradable low-cost agricultural mulching film based on PLA multielement composite modification technique, of which the thickness is down to 6 mu m and the maximum bio-base content is up to 60%, is developed. The controllable bio-based full-degradable mulching film has favorable quality, and has wide popularization application prospects in promoting national soil pollution treatment and developing ecological agriculture.
Description
Technical field
The invention belongs to biodegradable material field, be specifically related to a kind of controllable biological based fully degradable mulch film.
Background technology
Common agripast polyethylene (PE) mulch film is very difficult to decompose in air, sunlight, soil and water, promotes " White Revolution " of agricultural produce then, cause today the agriculture underproduction, Land pollution " white pollution ".Cause the major cause of " white pollution " to be that peasant uses mulch film for years in a large number, especially use thickness lower than the ultra-thin mulch film of national standard for saving cost, mulch film is easily broken, and cannot reclaim and clear up, and becomes the permanent rubbish in farmland.Residual mulching film badly influences crop germinating growth, causes the underproduction.
Reclaiming mulch film and developing degradable mulch film is the both direction solving Plastic-film pollution at present in the world.Wherein degradative plastic film reclaims residual film and these two links of process for peasant eliminates, and along with the damaged film gathering expense, the waste management expense that improve year by year, this is plastics pollution method the most easily.But a lot of degradable film overwhelming majority reported at present add that photosensitizers, starch or calcium carbonate etc. are prepared from traditional petroleum-based plastics PE, it disintegration can become small shreds within certain period, but the PE in mulch film does not really degrade, more serious to the pollution of soil reclamation.
Complete biodegradable mulch film is due to its special molecular composition, in use stable performance; Under the environment such as compost, soil, water and activated sludge, finally can be decomposed into carbonic acid gas and water by the enzyme in microorganism or animal and plant body, there is good biocompatibility and Bioabsorbable after using.The enterprises such as current domestic existing golden hair science and technology, prosperous rich medicine company carry out the experiment of scale complete biodegradable film on the ground such as Xinjiang, Yunnan, what adopt is that aliphatic copolyester gathers the petroleum base biodegradable plastic such as hexanodioic acid-succinic acid-butanediol ester (PBSA), poly terephthalic acid-tetramethylene adipate (PBAT) respectively, test effect is unsatisfactory, there is poor mechanical property, degradation cycle cannot regulate and control and high in cost of production defect, the raw material adopted in addition remains petroleum-based plastics; And external with French Lima Glan group for representing Biolice degradable mulch, principal constituent is PBAT/ starch, and this mulch film is due to containing starch, and poor water resistance, causes mulch film to be incubated the effect of guarantor's entropy poor.In addition these ground film thicknesses are at least more than 12 μm, considerably increase the cost of mulch film, cause popularization not smooth.
The object of the invention is the defect overcoming existing mulch film, there is provided a kind of can controlled, the mechanical strength of degradation cycle higher than PE mulch film, film thickness be down to 6 μm, relative inexpensiveness and Bio-based content be up to 60% bio-based whole degrading film, meet the needs that China administers agriculture plantation " white pollution ".By finding the retrieval of prior art document, there is not yet the report relevant to technical scheme of the present invention.
Summary of the invention
Technical problem: the object of the present invention is to provide a kind of controllable biological based fully degradable mulch film, this mulch film has that degradation cycle is controlled, mechanical strength higher than PE mulch film, film thickness is down to 6 μm, relative inexpensiveness and Bio-based content be up to the feature such as 60%, meet the needs that China administers agriculture plantation " white pollution ".
Technical scheme: technical scheme of the present invention is: a kind of controllable biological based fully degradable mulch film, is made up of the raw material of following parts by weight: poly(lactic acid) (PLA) 15-60 part, poly terephthalic acid-tetramethylene adipate (PBAT) 40-85 part, reactive assistant 0.1-0.5 part, oxidation inhibitor 0.1-0.5 part, lubricant 0.1-0.5 part, uv-absorbing agent 0.1-0.5 part and photostabilizer 0.1-0.5 part.
Above-mentioned reactive assistant is dibenzoyl peroxide (BPO), dicumyl peroxide (DCP), peroxidation 2-ethylhexyl acid tert-pentyl ester (TAPO), peroxidation 2-ethylhexyl tert-butyl acrylate (TBPO), peroxidation acetic acid tert-pentyl ester (TAPA), peroxide acid tert-amyl acetate (TAPB), di-t-butyl peroxide (DTBP) or 2, one or more in 5-2,5-dimethyl-2,5-di(t-butyl peroxy)2,5-hexane (two 25).
Above-mentioned oxidation inhibitor is Hinered phenols antioxidant 1010, antioxidant 1076, antioxidant BHT, one or more in this two kind antioxidant of phosphite ester kind antioxidant 168, oxidation inhibitor 626, oxidation inhibitor phenyl-phosphite.
Above-mentioned lubricant is N, N-ethylene bis stearamide, one or more in amine hydroxybenzene, Zinic stearas, calcium stearate or epoxy soybean oil.
Described a kind of controllable biological based fully degradable mulch film, is characterized in that described uv-absorbing agent is one or more in UV531, UV320, UV326 or UV327.
Above-mentioned photostabilizer is one or more in photostabilizer 622, photostabilizer 770, photostabilizer 783, photostabilizer 791, photostabilizer 944 or photostabilizer 3853.
Beneficial effect: compared with prior art, present invention employs novel chemically-reactive auxiliary agent, solve an interface compatibility difficult problem of PLA and PBAT, and by the proportioning of adjustment PLA, PBAT and add other uv-absorbing agent, a difficult problem that photostabilizer solves degradative plastic film cycle controllability; Utilize the characteristic that poly(lactic acid) mechanical strength is high, develop based on PLA multiple elements design modification technology in conjunction with the advantage that PBAT snappiness is good, degradation cycle be controlled, film thickness be down to 6 μm, the higher and low cost agricultural mulching of complete biodegradable of Bio-based content.Controllable biological based fully degradable mulch film is superior in quality, to the application prospect promoting China's soil pollution treatment, the aspect that develops eco-agriculture has extensively popularization.
Embodiment
Following examples further illustrate content of the present invention, but should not be construed as limitation of the present invention.Without departing from the spirit and substance of the case in the present invention, amendment made for the present invention and replacement, all belong to scope of the present invention.
Embodiment 1:
By 60 parts of poly(lactic acid) (NatureWorks company Ingeo
tM4032D), 40 parts of poly terephthalic acid-tetramethylene adipate (BASF AG
f BX 7011), 0.5 part of BPO, 0.5 part of antioxidant 1010,0.5 part of N, N-ethylene bis stearamide, 0.5 part of UV531 and 0.5 part photostabilizer 622 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 12 μm, and fabric width is 920mm.The tensile strength of mulch film is 35Mpa, and elongation at break reaches 260%, and tear strength is 131N/mm.This mulch film is layed in green house of vegetables ground by October, and 90 days start to occur broken hole, and 130 days mulch films start to enter and split the phase greatly, within 160 days, substantially can't see mulch film relic.
Embodiment 2:
By 45 parts of poly(lactic acid) (NatureWorks company Ingeo
tM4032D), 55 parts of poly terephthalic acid-tetramethylene adipate (BASF AG
f BX 7011), 0.3 part of DCP, 0.3 part of antioxidant 1076,0.3 part of amine hydroxybenzene, 0.3 part of UV320 and 0.3 part photostabilizer 770 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 12 μm, and fabric width is 920mm.The tensile strength of mulch film is 32Mpa, and elongation at break reaches 310%, and tear strength is 119N/mm.This mulch film is layed in green house of vegetables ground by October, and 75 days start to occur broken hole, and 110 days mulch films start to enter and split the phase greatly, within 150 days, substantially can't see mulch film relic.
Embodiment 3:
By 35 parts of poly(lactic acid) (NatureWorks company Ingeo
tM4032D), 65 parts of poly terephthalic acid-tetramethylene adipate (BASF AG
f BX 7011), 0.25 part of two 25,0.25 parts of antioxidant BHT, 0.25 part of Zinic stearas, 0.25 part of UV326 and 0.25 part photostabilizer 783 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 6 μm, and fabric width is 920mm.The tensile strength of mulch film is 29Mpa, and elongation at break reaches 352%, and tear strength is 112N/mm.This mulch film is layed in corn field by May, and 60 days start to occur broken hole, and 76 days mulch films start to enter and split the phase greatly, within 110 days, substantially can't see mulch film relic.
Embodiment 4:
By 25 parts of poly(lactic acid) (NatureWorks company Ingeo
tM4032D), 65 parts of poly terephthalic acid-tetramethylene adipate (BASF AG
f BX 7011), 0.2 part of TAPO, 0.2 part of oxidation inhibitor, 626,0.2 part of calcium stearate, 0.2 part of UV327 and 0.2 part photostabilizer 791 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 6 μm, and fabric width is 920mm.The tensile strength of mulch film is 27Mpa, and elongation at break reaches 374%, and tear strength is 105N/mm.This mulch film is layed in corn field by May, and 55 days start to occur broken hole, and 70 days mulch films start to enter and split the phase greatly, within 106 days, substantially can't see mulch film relic.
Embodiment 5:
By 15 parts of poly(lactic acid) (NatureWorks company Ingeo
tM4032D), 85 parts of poly terephthalic acid-tetramethylene adipate (BASF AG
f BX 7011), 0.1 part of TBPO, 0.1 part of irgasfos 168,0.1 part of epoxy soybean oil, 0.1 part of UV531 and 0.1 part photostabilizer 944 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 6 μm, and fabric width is 920mm.The tensile strength of mulch film is 25Mpa, and elongation at break reaches 466%, and tear strength is 97N/mm.This mulch film is layed in cotton field by April, and 30 days start to occur broken hole, and 47 days mulch films start to enter and split the phase greatly, within 100 days, substantially can't see mulch film relic.
Comparative example 1:
By 100 parts of poly terephthalic acids-tetramethylene adipate (BASF AG
f BX 7011), 0.1 part of BPO, 0.1 part of antioxidant 1010,0.1 part of N, N-ethylene bis stearamide, 0.1 part of UV531 and 0.1 part photostabilizer 622 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 12 μm, and fabric width is 920mm.The tensile strength of mulch film is 22Mpa, and elongation at break reaches 587%, and tear strength is 88N/mm.This mulch film is layed in green house of vegetables ground by October, and 15 days start to occur broken hole, and 25 days mulch films start to enter and split the phase greatly, within 62 days, substantially can't see mulch film relic.
Comparative example 2:
By 100 parts of PBSA, 0.1 part of BPO, 0.1 part of antioxidant 1010,0.1 part of N, N-ethylene bis stearamide, 0.1 part of UV531 and 0.1 part photostabilizer 622 add after high mixer mixes, then by compound by the modification of parallel equidirectional two-screw forcing machine melt blending reactive extrursion.By the modifying material of preparation by common PE inflation film manufacturing machine blown film, thickness is 12 μm, and fabric width is 920mm.The tensile strength of mulch film is 20.5Mpa, and elongation at break reaches 622%, and tear strength is 86N/mm.This mulch film is layed in green house of vegetables ground by October, and 13 days start to occur broken hole, and 22 days mulch films start to enter and split the phase greatly, within 53 days, substantially can't see mulch film relic.
Comparative example 3:
By the PBAT/ starch conversion of BOLICE company ground coating materials by common PE inflation film manufacturing machine blown film, thickness is 16 μm, and fabric width is 920mm.The tensile strength of mulch film is 12.5Mpa, and elongation at break reaches 328%, and tear strength is 92N/mm.This mulch film is layed in green house of vegetables ground by October, and 11 days start to occur broken hole, and 21 days mulch films start to enter and split the phase greatly, within 50 days, substantially can't see mulch film relic.
Claims (6)
1. a controllable biological based fully degradable mulch film, it is characterized in that, proportioning is by raw material by weight: poly(lactic acid) 15-60 part, poly terephthalic acid-tetramethylene adipate 40-85 part, reactive assistant 0.1-0.5 part, oxidation inhibitor 0.1-0.5 part, lubricant 0.1-0.5 part, uv-absorbing agent 0.1-0.5 part and photostabilizer 0.1-0.5 part form.
2. a kind of controllable biological based fully degradable mulch film according to claim 1, it is characterized in that, described reactive assistant is dibenzoyl peroxide, dicumyl peroxide, the acid of peroxidation 2-ethylhexyl tert-pentyl ester, peroxidation 2-ethylhexyl tert-butyl acrylate, peroxidation acetic acid tert-pentyl ester, peroxide acid tert-amyl acetate, di-t-butyl peroxide or 2, any one in 5-dimethyl-2,5-bis-hexane.
3. a kind of controllable biological based fully degradable mulch film according to claim 1, it is characterized in that, described oxidation inhibitor is Hinered phenols antioxidant 1010, antioxidant 1076, antioxidant BHT, any one in phosphite ester kind antioxidant 168, oxidation inhibitor 626, oxidation inhibitor phenyl-phosphite.
4. a kind of controllable biological based fully degradable mulch film according to claim 1, it is characterized in that, described lubricant is N, N-ethylene bis stearamide, any one in amine hydroxybenzene, Zinic stearas, calcium stearate or epoxy soybean oil.
5. a kind of controllable biological based fully degradable mulch film according to claim 1, is characterized in that, described uv-absorbing agent is any one in UV531, UV320, UV326 or UV327.
6. a kind of controllable biological based fully degradable mulch film according to claim 1, it is characterized in that, described photostabilizer is any one in photostabilizer 622, photostabilizer 770, photostabilizer 783, photostabilizer 791, photostabilizer 944 or photostabilizer 3853.
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