CN103651022B - A kind of point asynchronous controllable full-biodegradable agricultural mulching of band - Google Patents
A kind of point asynchronous controllable full-biodegradable agricultural mulching of band Download PDFInfo
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- CN103651022B CN103651022B CN201310613883.9A CN201310613883A CN103651022B CN 103651022 B CN103651022 B CN 103651022B CN 201310613883 A CN201310613883 A CN 201310613883A CN 103651022 B CN103651022 B CN 103651022B
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Abstract
The invention discloses a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, it at least forms by the controllable biodegradable band that three degradative phases are different is alternate, and described controllable biodegradable band is full-biodegradable material.Compared with prior art, subregion provided by the present invention asynchronous controllable full-biodegradable agricultural mulching realizes the optimization of mulch film function by preferred degradable material formula, and significantly improve biodegradable controllability, and meet crop different growth stage to temperature, moisture, ventilative etc. needs by the asynchronous degraded of subregion, there is dynamic, multidirectional regulatory function.In addition, each band degradation cycle of controllable part biological degradation agricultural mulching in middle part provided by the present invention is different, but is Biodegradable Materials, finally realizes degradable, reduces environmental pollution.
Description
Technical field
The present invention relates to Material Field, particularly one divides band asynchronous controllable full-biodegradable agricultural mulching.
Background technology
There are two outstanding problems in common polythene mulch film: one is, difficult degradation easily causes white pollution, affects soil quality, even affects output; Two are, its raw material petroleum resources are limited.And bio-based degradation plastic PLA (Poly Lactic Acid, PLA) can be biodegradable into CO under the condition of water oxygen appropriateness
2and H
2o, and the raw material of PLA mainly comes from corn.The discovery of PLA and development solve the above-mentioned two problems that common polythene runs into, and constantly expand in recent years in Agro-film Industry application scale.PLA has good mechanical property as having higher intensity, but the shortcoming such as flexible is poor, impact strength is lower.Biodegradation material aliphatic-aromatic polyester has good toughness and elongation at break, is commonly used to blended toughness and the elongation at break improving PLA with PLA.But its blended incompatibility hinders the performance of its resulting materials.Patent (publication No.: CN102660008A) provides the production method of a kind of aliphatic-aromatic copolyester and PLA block copolymer, for its application provides condition.Meanwhile, starch-base biodegradation material direct formation of film at surface, stationary phase is shorter, degrades early, soon, is unfavorable for crop heat and moisture preserving in mid-term, easily reduces output.But also there is no the technical scheme of the blended production controllable biodegradable mulch film of aliphatic-aromatic polyester copolymer, PLA and starch-base biodegradation material, more there is no the technical scheme of the complete biodegradable agricultural mulching of the asynchronous degraded of subregion.In addition, degradative plastic film synchronous degradation, if degradative phase is oversize be unfavorable for decreasing temperature and increasing humidity; If degradative phase is too short, although energy decreasing temperature and increasing humidity is because increasing disengagement area, moisture loss accelerates, and is unfavorable for improving water use efficiency, and cooling extent is also unfavorable for that too greatly accumulated temperature increases, output increased.
Summary of the invention
The object of this invention is to provide a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, not only meet crop different growth stage to temperature, moisture, ventilative etc. needs, and reduce the problem of environmental pollution that common polythene mulch film causes.
For achieving the above object, the present invention adopts following technical scheme:
A kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, it at least forms by the controllable biodegradable band that three degradative phases are different is alternate, and described controllable biodegradable band is full-biodegradable material.
Further, a kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that three degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, middle is short life controllable biodegradable band, and both sides are long-life controllable biodegradable band.
Further, a kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that three degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, centre is long-life controllable biodegradable band, and both sides are short life controllable biodegradable band.
Further, a kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that five degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, wherein, one, three and five bands are long-life controllable biodegradable band, and two and four bands are short life controllable biodegradable band.
Further, a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, by weight, the raw material producing long-life biological degradation band comprise full-biodegradable material 100 parts, PLA 5-35 part, bulking agent 0.5-5 part, light stabilizer 0.1-0.5 part, heat stabilizer 0.1-0.5 part.
Further, a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, by weight, the raw material producing short-life biological degradation band comprise full-biodegradable material 100 parts, bulking agent 0.5-5 part, thermal oxidative degradation promoter 5-30 part, catalyzer 0.1-1 part.
Further, a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, described full-biodegradable material is mixed by 70-95 part aliphatic-aromatic polyester copolymer and 5-30 part PLA.
Further, a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, described full-biodegradable material also comprises 4-15 part starch-base biodegradation material and/or 2-30 part CO
2copolymer.
Further, a kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, described full-biodegradable material can directly by sold on the market aliphatic-aromatic polyester copolymer, PLA, starch-base biodegradation material and CO
2two or more mixing of copolymer.
Compared with prior art, the asynchronous controllable full-biodegradable agricultural mulching of subregion provided by the present invention realizes the optimization of mulch film function by preferential degradation material prescription, and significantly improve biodegradable controllability, and meet crop different growth stage to temperature, moisture, ventilative etc. needs by the asynchronous degraded of subregion, there is dynamic, multidirectional regulatory function.In addition, each band degradation cycle of controllable part biological degradation agricultural mulching in middle part provided by the present invention is different, but is Biodegradable Materials, finally realizes degradable, reduces environmental pollution.
Accompanying drawing explanation
The processing technology schematic diagram of the asynchronous controllable full-biodegradable agricultural mulching of Fig. 1 subregion provided by the present invention.
Description of reference numerals: 1 full-biodegradable material A, 2 full-biodegradable material B, 3 bulking agents, 4 heat stabilizers, 5 light stabilizers, 6 thermal oxidative degradation promoter, 7 catalyzer, 8 masterbatch, 9 finished products.
Embodiment
In order to make object of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein only in order to explain the present invention, be not intended to limit the present invention.
A kind of point of asynchronous controllable full-biodegradable agricultural mulching of band, it at least forms by the controllable biodegradable band that three degradative phases are different is alternate, and controllable biodegradable band is full-biodegradable material.Agricultural mulching provided by the present invention is compared with traditional mulch film, and the raw material just used are different, and its processing technology is identical.
The asynchronous controllable full-biodegradable agricultural mulching of subregion provided by the present invention realizes the optimization of mulch film function by preferential degradation material prescription, and significantly improve biodegradable controllability, and meet crop different growth stage to temperature, moisture, ventilative etc. needs by the asynchronous degraded of subregion, there is dynamic, multidirectional regulatory function.In addition, each band degradation cycle of controllable part biological degradation agricultural mulching in middle part provided by the present invention is different, but is Biodegradable Materials, finally realizes degradable, reduces environmental pollution.
Specific embodiment one
A kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that three degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, middle is short life controllable biodegradable band, and both sides are long-life controllable biodegradable band.Utilize three road co-extrusions, wherein first and third passage is long-life controllable biodegradable material blowing passage, and center-aisle is short life controllable biodegradable material blowing passage.In first and third passage, by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1,5-30 part PLA 2,0.5-5 part bulking agent 3, stirs rear extrusion granulating machine and makes masterbatch 8.In center-aisle, by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1; 5-30 part PLA 2,0.5-5 part bulking agent 3,5-30 part thermal oxidative degradation promoter 6; 0.1-1 part catalyzer 7, stirs rear extrusion granulating machine and makes masterbatch 8.Then conveniently blow molding process mates coextrusion blow to finished product 9.Wherein, thermal oxidative degradation promoter and catalyzer are in order to regulate and control the degradation time of controllable biodegradable band.
Can directly by sold on the market aliphatic-aromatic polyester copolymer, PLA, starch-base biodegradation material and CO for the full-biodegradable material wanted required for the present invention
2two or more mixing of copolymer, thus obtain the raw material of aforementioned proportion.In specific embodiment two and three, also similar.
Specific embodiment two
A kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that three degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, centre is long-life controllable biodegradable band, and both sides are short life controllable biodegradable band.Utilize three road co-extrusions, wherein first and third passage is short life controllable biodegradable material blowing passage, and center-aisle is short life controllable biodegradable material blowing passage.In first and third passage, by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1; 5-30 part PLA 2,0.5-5 part bulking agent 3,5-30 part thermal oxidative degradation promoter 6; 0.1-1 part catalyzer 7, stirs rear extrusion granulating machine and makes masterbatch 8.In center-aisle, by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1,5-30 part PLA 2,0.5-5 part bulking agent 3, stirs rear extrusion granulating machine and makes masterbatch 8.Then conveniently blow molding process mates coextrusion blow to finished product 9.
Specific embodiment three
A kind of point asynchronous controllable full-biodegradable agricultural mulching of band, it forms by the controllable biodegradable band that five degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable band and short life controllable biodegradable band, wherein, one, three and five bands are long-life controllable biodegradable band, and two and four bands are short life controllable biodegradable band.Utilize five road co-extrusions, wherein first and third, Five-channel is short life controllable biodegradable material blowing passage, two, four-way is short life controllable biodegradable material blowing passage.First and third, in Five-channel, by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1; 5-30 part PLA 2,0.5-5 part bulking agent 3,0.1-0.5 part light stabilizer 4; 0.1-0.5 part heat stabilizer 5, stirs rear extrusion granulating machine and makes masterbatch 8.Two, in four-way, respectively by weight percentage, by 70-95 part aliphatic-aromatic polyester copolymer 1; 5-30 part PLA 2,0.5-5 part bulking agent 3,5-30 part thermal oxidative degradation promoter 6; 0.1-1 part catalyzer 7, stirs rear extrusion granulating machine and makes masterbatch 8.Then conveniently blow molding process mates coextrusion blow to finished product 9.
Carry out mechanical property and the light transmission test of mulch film according to GB/T 1040.3-2006 and GB/T 2410-80, carry out the degradation property test of mulch film according to GB/T 20197-2006.
Table 1
Note: moisture determination is all in mid-July.
At the beginning of by the end of April to 5 month, the crop-planting desirably heat peanut, cotton etc. early stage or field planting in the intermediate strap of embodiment one, two or two, four bands of embodiment three, heat effect and common ground film does not have significant difference.After entering rainfall season, short life controllable biodegradable band becomes band or the block degraded of point, can reduce the impact of high temperature on root growth, significantly improve the moisture around root system, be beneficial to root system and keep higher vigor and longer activity period, can output be significantly improved.For peanut, each embodiment all can significantly be increased production, best with embodiment three.
In the technical scheme that the present invention announces, involved light stabilizer can be one or more the mixture in Hinered phenols antioxidant, hindered amine as light stabilizer, UV absorbers.Described heat stabilizer can be one or more mixture of disulfide group 2-ethyl hexyl ethanoate stannous methide, two maleic acid monoacetate dioctyltin, calcium zinc stabilizer.Described bulking agent can be one or more the mixture in maleic anhydride, acrylic acid modified polylactic acid low polymer, monomeric fatty acid glyceride or epoxy rubber, glycidyl acrylate, styrene maleic anhydride copolymer grafted polyethylene or other graft polyolefins.
Involved catalyzer can be one or more the mixture in tin octoate, stannous octoate, zinc ethyl, aluminium isopropoxide, tetraisopropoxy titanium or ferric acetyl acetonade.Adding of catalyzer can accelerated reaction, and be the needs of biological degradation Process flowchart, addition increases, then degraded accelerates.Its activity of many biological degradation enzyme require metal ion competence exertions, for meeting this kind of demand, used catalyst must be metallic catalyst.
Involved thermal oxidative degradation promoter can be the block copolymer of styrene-butadiene styrene.Biological degradation needs certain heat, and thermal oxidative degradation promoter is conducive to causing thermal source, promotes biological degradation.In addition, this promoter or a kind of thermoplastic elastomer (TPE), can also play toughened and reinforced effect in plastic substrate, makes up the intensity reduction that low molecular weight substance adds generation.
In sum, compared with prior art, the asynchronous controllable full-biodegradable agricultural mulching of subregion provided by the present invention realizes the optimization of mulch film function by preferential degradation material prescription, and significantly improve biodegradable controllability, and meet crop different growth stage to temperature, moisture, ventilative etc. needs by the asynchronous degraded of subregion, there is dynamic, multidirectional regulatory function.In addition, each band degradation cycle of controllable part biological degradation agricultural mulching in middle part provided by the present invention is different, but is Biodegradable Materials, finally realizes degradable, reduces environmental pollution.
The foregoing is only preferred embodiment of the present invention, be not used for limiting practical range of the present invention; If do not depart from the spirit and scope of the present invention, the present invention is modified or equivalent to replace, in the middle of the protection domain that all should be encompassed in the claims in the present invention.
Claims (1)
1. the asynchronous controllable full-biodegradable agricultural mulching of point band, is characterized in that, it at least forms by the controllable biodegradable resin strip that three degradative phases are different is alternate, and described controllable biodegradable resin strip is full-biodegradable material; If it forms by the controllable biodegradable resin strip that three degradative phases are different is alternate, different controllable biodegradable resin strip is respectively long-life controllable biodegradable resin strip and short life controllable biodegradable resin strip, middle is short life controllable biodegradable resin strip, both sides are long-life controllable biodegradable resin strip, or, centre is long-life controllable biodegradable resin strip, and both sides are short life controllable biodegradable resin strip; If it forms by the controllable biodegradable resin strip that five degradative phases are different is alternate, different controllable biodegradable bands is respectively long-life controllable biodegradable resin strip and short life controllable biodegradable resin strip, wherein, one, three and five bands are long-life controllable biodegradable resin strip, and two and four bands are short life controllable biodegradable resin strip; The raw material producing long-life Biodegradable resin band comprise, full-biodegradable material 100 parts, bulking agent 0.5-5 part, light stabilizer 0.1-0.5 part, heat stabilizer 0.1-0.5 part; The raw material producing short-life biological degradation band comprise, full-biodegradable material 100 parts, bulking agent 0.5-5 part, thermal oxidative degradation promoter 5-30 part, catalyzer 0.1-1 part; Described full-biodegradable material is mixed by 70-95 part aliphatic-aromatic polyester copolymer and 5-30 part PLA, and described full-biodegradable material also comprises 4-15 part starch-base biodegradation material and/or 2-30 part CO2 copolymer; Described light stabilizer is one or more the mixture in Hinered phenols antioxidant, hindered amine as light stabilizer, UV absorbers, described heat stabilizer is one or more mixture of disulfide group 2-ethyl hexyl ethanoate stannous methide, calcium zinc stabilizer, described thermal oxidative degradation promoter is the block copolymer of styrene-butadiene styrene, and described catalyzer is one or more the mixture in tin octoate, stannous octoate, zinc ethyl, aluminium isopropoxide, tetraisopropoxy titanium or ferric acetyl acetonade.
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