CN1836898A - Light reflective multifunctional composite film for greenhouse and process for preparing same - Google Patents
Light reflective multifunctional composite film for greenhouse and process for preparing same Download PDFInfo
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- CN1836898A CN1836898A CNA2006100260127A CN200610026012A CN1836898A CN 1836898 A CN1836898 A CN 1836898A CN A2006100260127 A CNA2006100260127 A CN A2006100260127A CN 200610026012 A CN200610026012 A CN 200610026012A CN 1836898 A CN1836898 A CN 1836898A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A40/00—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production
- Y02A40/10—Adaptation technologies in agriculture, forestry, livestock or agroalimentary production in agriculture
- Y02A40/25—Greenhouse technology, e.g. cooling systems therefor
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Abstract
The present invention is reflecting multifunctional three-layer composite film for greenhouse and its preparation process. The composite film has a first or outer layer of polyethylene added with light reflecting and ultraviolet ray absorbing master batch, a second or middle layer of ethylene-vinyl acetate copolymer or the mixture of ethylene-vinyl acetate copolymer and polyethylene added with light reflecting and ultraviolet ray absorbing master batch, and a third or inner layer of polyethylene added with far infrared blocking master batch and black master batch. The first layer is silver or white and the third layer is black. The composite film has the functions of reflecting visible light, absorbing ultraviolet ray, blocking far infrared, killing pests, killing weeds, lower temperature, etc. and possesses excellent mechanical performance and ageing resistance.
Description
Technical field
The present invention relates to a kind of agricultural cladding material and preparation method thereof.Or rather, the present invention relates to a kind of greenhouse three layers of laminated film of light reflective multifunctional and preparation method thereof.
Background technology
The greenhouse mainly is meant greenhouse cover film (canopy film) and ground cover film (mulch film) with film, is the indispensable means of production of current agricultural production.Canopy film, mulch film are used for cultivation and the early stage seedling of all kinds of crops and industrial crops, can play the effect of regulating illumination, weeding, water saving and control soil salinity and alkalinity.
Functional greenhouse has the specific function that common canopy film, mulch film do not possess with film, as: functions such as ageing-resistant, anti-droplet, insulation, cooling, light modulation, weeding, expelling parasite.Functional greenhouse is primary raw material with film with polyethylene (PE), ethylene-vinyl acetate copolymer polyolefin such as (EVA) or polyvinyl chloride (PVC) resin, add a certain amount of functional form auxiliary agent or master batch, through mix, extrude, blowing or casting technique process.
Though the researcher has done number of research projects both at home and abroad, developing some is the functional greenhouse functional film of raw material with polyethylene (PE) and ethylene-vinyl acetate copolymer (EVA), for example: day the present invention " agricultural cladding material " (JP61203147, open day: on September 9th, 1986) disclosing a kind of was the agricultural film of raw material with the linea low density PE of 80～95%wt and the EVA of 20～5%wt, film thickness is 45～105 μ m, add benzotriazole UV absorbers, absorbing wavelength is 370nm and following ultraviolet light.
Korea S invention " three-layer thin-film " (KR9607015, open day: on May 27th, 1996) disclose a kind of have favorable optical performance, weatherability, physical strength, and having is transparent by day, thereby absorbs the film that far infrared plays insulation effect evening.Film raw material is one or both among low density polyethylene (LDPE) (LDPE), LLDPE (LLDPE), the EVA, and three-layer thin-film thickness ratio is: 1: 1～4: 1～3.
The disclosed various agricultural in this area still has the following disadvantages with functional film: simultaneously reflect visible light, absorb ultraviolet ray, intercept far infrared, by the light of reflection different-waveband, thereby crops are played the function of weeding, expelling parasite, insulation, cooling by the physical action of light.
Summary of the invention
The purpose of this invention is to provide a kind of reflect visible light simultaneously, absorb ultraviolet ray, intercept far infrared, realize expelling parasite, cooling by reflection different-waveband light, thereby absorb all wavelengths light plays weeding, insulation by the physical action of light function, and laminated film with good mechanical performance and ageing resistace, it is characterized in that: a kind of greenhouse three layers of laminated film of light reflective multifunctional, it is raw material that ground floor (skin) adopts polyethylene (PE), adds the light uv reflectance and absorbs masterbatch; It is raw material with polyethylene (PE) blend that the second layer (middle level) adopts ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA), adds the light uv reflectance and absorbs masterbatch; The 3rd layer (internal layer) adopts polyethylene (PE) is raw material, adds far infrared and intercepts masterbatch, black masterbatch; Laminated film ground floor provided by the invention (skin) is silver color or white, and the 3rd layer (internal layer) is black.
Another object of the present invention provides the preparation method of this greenhouse with three layers of laminated film of light reflective multifunctional.
The invention provides a kind of greenhouse three layers of laminated film of light reflective multifunctional, it is raw material that ground floor (skin) adopts polyethylene (PE), adds the light uv reflectance and absorbs masterbatch; It is raw material with polyethylene (PE) blend that the second layer (middle level) adopts ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA), adds the light uv reflectance and absorbs masterbatch; The 3rd layer (internal layer) adopts polyethylene (PE) is raw material, adds far infrared and intercepts masterbatch and black masterbatch.This greenhouse three layers of laminated films energy of light reflective multifunctional reflect visible light, absorption ultraviolet ray, absorption visible light, obstruct far infrared simultaneously, thereby realize cooling, expelling parasite by reflection different-waveband light, thereby play the function of weeding, insulation by absorbing all wave band light, and have good mechanical performance and ageing resistace.
Greenhouse provided by the invention three layers of laminated film of light reflective multifunctional, it is characterized in that: the thickness of ground floor (skin) accounts for 25～30% of laminated film gross thickness; The thickness of the second layer (middle level) accounts for 40～50% of laminated film gross thickness; The 3rd layer (internal layer) account for 25～30% of laminated film gross thickness.
Smooth uv reflectance provided by the invention absorbs masterbatch, be with metallocene linear-low density polyethylene (mLLDPE), ultra-violet absorber, aluminium powder or rutile type titanium white, processing aid, get by 35%～50%: 15%～25%: 30%～35%: 0～5% percentage by weight is mixed.
Described ultraviolet absorber can be: any one in benzophenone ultra-violet absorber (UV-531), benzotriazole ultra-violet absorber (327,5411), the hydroxy benzenes triazines ultra-violet absorber (UV1164) or any two kinds mixture.
Described aluminium powder is a flake aluminum, aluminium powder thickness≤1 μ m, aluminium powder diameter 〉=10 μ m; The preferred rutile type titanium white of described titanium dioxide.
Greenhouse provided by the invention three layers of laminated film of light reflective multifunctional, it is raw material that its ground floor (skin) adopts polyethylene (PE), preferred bimodal medium density polyethylene.
The addition of ultra-violet absorber of the present invention accounts for 15～25%wt of light reflection UV absorption masterbatch, and this masterbatch accounts for 8～10%wt of laminated film ground floor (skin).
Greenhouse provided by the invention three layers of laminated film of light reflective multifunctional, it is raw material with polyethylene (PE) blend that its second layer (middle level) adopts ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA), wherein, the weight ratio of EVA and PE is in ethylene-vinyl acetate copolymer (EVA) and polyethylene (PE) blend: 2: 1; Described smooth uv reflectance absorbs masterbatch preparation process and absorbs masterbatch with the light uv reflectance that ground floor adds, and addition accounts for the 0～10%wt in the second layer (middle level).
Greenhouse provided by the invention three layers of laminated film of light reflective multifunctional, its 3rd layer (internal layer) adopt polyethylene (PE), market to purchase and concentrate the black masterbatch is raw material, preferred bimodal medium density polyethylene.
Far infrared provided by the invention (IR) intercepts masterbatch, is with ethylene-vinyl acetate copolymer (EVA), far infrared barrier, processing aid, and by 15%～25%: 70%～80%: 0～5% percentage by weight is mixed to be got.
Described far infrared barrier can be: calcium carbonate (CaCO
3), talcum powder, mica powder, aluminium hydroxide (Al (OH)
3) in any one or any two kinds mixture
The addition of described far infrared barrier accounts for 70～80%wt that far infrared intercepts masterbatch, accounts for 6～8%wt of laminated film the 3rd layer (internal layer).
The invention provides the preparation method of this greenhouse with three layers of laminated film of light reflective multifunctional: three layers of mixed ingredients add the mixing melt that plastifies into of extruder respectively, clamp-on the compound die head in three-layer co-extruded multithread road, melt is extruded into pipe through compound die head, the compressed air inflation of pipe film forming bubble, film bubble through drawing-off, cool off, be wound into the greenhouse with light reflective multifunctional composite membrane.
The described concrete technological process of production is:
(1), at first metallocene linear-low density polyethylene (mLLDPE) and ultra-violet absorber and flake aluminum, processing aid are mixed, or metallocene linear-low density polyethylene (mLLDPE), rutile type titanium white, ultra-violet absorber, processing aid are mixed.Compound is by behind the parallel dual-screw extruding machine extrusion plasticizing, and pelletizing becomes silver color or white light uv reflectance to absorb masterbatch;
(2), ethylene-vinyl acetate copolymer (EVA) is mixed with far infrared barrier powder, processing aid, compound is by behind the parallel dual-screw extruding machine extrusion plasticizing, and pelletizing becomes far infrared to intercept masterbatch;
(3), then, respectively bimodal medium density polyethylene and light uv reflectance absorption masterbatch (silver color or white) are mixed; Ethylene-vinyl acetate copolymer (EVA) and light uv reflectance are absorbed masterbatch to be mixed;
(4), concentrated black masterbatch is purchased in bimodal medium density polyethylene and market, far infrared intercepts masterbatch and is mixed, and adds respectively in three extruders;
(5), material is under the temperature and pressure effect, fusion plastification, fused materials is extruded into composite pipe blank through the compound die head in three-layer co-extruded multithread road, the compressed air inflation of pipe film forming bubble, the film bubble is through drawing-off, cooling and shaping, coiling film forming volume, and the film volume is finished product after checking.
Greenhouse provided by the invention has following characteristics with three layers of laminated film of light reflective multifunctional:
(1), greenhouse provided by the invention is silver/black or white/black double-colored film with three layers of laminated film of light reflective multifunctional, can be respectively applied for that the greenhouse covers (canopy film) or ground covers (mulch film).
(2), greenhouse provided by the invention is splendid with light reflective multifunctional three layers of laminated film mechanical property, the hot strength of laminated film, elongation at break are higher than international like product index.
(3), greenhouse provided by the invention with three layers of laminated film of light reflective multifunctional use aluminium and white to the visible light high reflectance, drive away aphid; Use the stronger ultra-violet absorber of ultraviolet radiation absorption efficient, can intercept ultraviolet ray, obviously reduce the infringement of Thripidae insect and fungi.
(4), the obviously reduction of far infrared transport (IR/%) that the far infrared barrier makes film is used with three layers of laminated film of light reflective multifunctional in greenhouse provided by the invention, and reach IR% less than 20%, thereby intercept the far-infrared radiation of greenhouse and soil effectively, play good insulation effect.Temperature can improve 1～3 ℃ in the winter greenhouse.
(5), greenhouse provided by the invention because silver color or white can reflect the visible light of all wavelengths, obviously reduces the solar radiant energy that enters the greenhouse with the ground floor (skin) of three layers of laminated film of light reflective multifunctional.On daytime in summer, the soil that composite membrane covers in the greenhouse reduces by 1～2 ℃ of temperature than the soil that does not cover composite membrane.
(6), greenhouse provided by the invention can absorb all wavelengths visible light with the 3rd layer (internal layer) of three layers of laminated film of light reflective multifunctional owing to black, the obstruct sunshine.Thereby make weeds lose growth conditions and need not to add herbicide, just can remove the weeds under the laminated film covering.
Below, the present invention is further illustrated with embodiment in conjunction with the accompanying drawings.
Fig. 1 is greenhouse provided by the invention three layers of laminated film schematic diagram of light reflective multifunctional.
1: ground floor (skin) is silver color or white for adding the polyethylene (PE) that the light uv reflectance absorbs masterbatch, and the thickness of ground floor (skin) accounts for 25～30% of laminated film gross thickness.
2: the second layer (middle level) is ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA) and polyethylene (PE) blend, and the thickness of the second layer (middle level) accounts for 40～50% of laminated film gross thickness.
3: the three layers (internal layers) are black for adding the polyethylene (PE) that far infrared intercepts masterbatch, black masterbatch, the 3rd layer (internal layer) account for 25～30% of laminated film gross thickness.
Embodiment
For prescription, the preparation method of greenhouse provided by the invention with three layers of laminated film of light reflective multifunctional clearly is described, following specific embodiment is provided, but anything but in order to limit the present invention.
Embodiment 1:
(thickness of aluminium powder is less than 1 μ m with metallocene linear polyethylene (mLLDPE), flake aluminum, diameter is greater than 10 μ m), ultra-violet absorber, ultra-violet absorber is UV-531 (UV-531) or UV absorbent 327 (2-(2 '-hydroxyl-3 ', 5 '-di-tert-butyl-phenyl)-the 5-chlorinated benzotriazole, 40%, 35%, 25% ratio is by weight weighed and is added in the high-speed mixer respectively, fully stirred 15 minutes, unload material, add in the parallel dual-screw extruding machine.Mixing plasticizing under 180～200 ℃ of temperature conditions is extruded after die face hot cut pellet device is cut into oblate pellet.Wind is delivered to cooling bath, the metering of cooling back, and the brown paper packaging bag of packing into, it is standby to absorb masterbatch (silver color) as the light uv reflectance.
With EVA (vinyl acetate content is 14% ethylene-vinyl acetate copolymer), (particle diameter is at the following calcium carbonate superfine powder of 10um, or SiO for the far infrared barrier
2Content is 52.4% mica powder), processing aid, 25%, 70%, 5% ratio is weighed by weight respectively, adds in the high-speed mixer, fully stirs 15 minutes, unloads material, is added in the parallel dual-screw extruding machine.Mixing plasticizing under 170～190 ℃ of temperature conditions is extruded after die face hot cut pellet device is cut into oblate pellet, and wind is delivered to cooling bath, and the brown paper packaging bag of packing into is measured in the cooling back, and is standby as far infrared (IR) obstruct masterbatch.
Purchase highly enriched black masterbatch on the market, carbon black content is more than 35%.
Select three-layer co-extruded compound blown film to produce cover of unit (comprising three extruders), bimodal medium density polyethylene, light uv reflectance are absorbed masterbatch (silver color), 90%, 10% ratio by weight adds extruder I respectively, and mixing plasticizing under 160～190 ℃ of temperature; EVA (ethylene-vinyl acetate copolymer), light uv reflectance are absorbed masterbatch (silver color) difference 90%, 10% ratio by weight add extruder II, and mixing plasticizing under 150～180 ℃ of temperature conditions; Bimodal medium density polyethylene, far infrared (IR) are intercepted masterbatch, highly enriched black masterbatch difference 88%, 6%, 6% ratio adding extruder III by weight, and mixing plasticizing under 160～190 ℃ of temperature conditions.The compound die head in three-layer co-extruded multithread road clamp-oned fused materials respectively by above-mentioned three extruders, and the die head heating-up temperature is 180～190 ℃.Melt is extruded into pipe through compound die head, and feeds compressed air, and pressure is 0.1～0.3MPa.Pipe is 2: 1 inflation film forming bubbles by blow-up ratio.The film bubble is through drawing-off, cooling, coiling film forming volume.Make silver/black double-colored greenhouse three layers of laminated film of light reflective multifunctional.
Embodiment 2:
With metallocene linear polyethylene (mLLDPE), rutile type titanium white, ultra-violet absorber, ultra-violet absorber is UV-531 (UV-531) or UV absorbent 327 (2-(2 '-hydroxyl-3 ', 5 '-di-tert-butyl-phenyl)-the 5-chlorinated benzotriazole, 40%, 35%, 25% ratio is by weight weighed and is added in the high-speed mixer respectively, fully stirred 15 minutes, unload material, add in the parallel dual-screw extruding machine.Mixing plasticizing under 180～200 ℃ of temperature conditions is extruded after die face hot cut pellet device is cut into oblate pellet.Wind is delivered to cooling bath, the metering of cooling back, and the brown paper packaging bag of packing into, it is standby to absorb masterbatch (white) as the light uv reflectance.
With EVA (vinyl acetate content is 14% ethylene-vinyl acetate copolymer), (particle diameter is at the following calcium carbonate superfine powder of 10um, SiO for inorganic far infrared barrier
2Content is 52.4% mica powder), processing aid is weighed by weight 25%, 70%, 5% ratio respectively, adds in the high-speed mixer, fully stirs 15 minutes, unloads material, is added in the parallel dual-screw extruding machine.Mixing plasticizing under 170～190 ℃ of temperature conditions is extruded after die face hot cut pellet device is cut into oblate pellet, and wind is delivered to cooling bath, and the brown paper packaging bag of packing into is measured in the cooling back, and is standby as far infrared (IR) obstruct masterbatch.
Purchase highly enriched black masterbatch on the market, carbon black content is more than 35%.
Select three-layer co-extruded compound blown film to produce cover of unit (comprising three extruders), bimodal medium density polyethylene, light uv reflectance are absorbed masterbatch (white), 90%, 10% ratio by weight adds extruder I respectively, and mixing plasticizing under 160～190 ℃ of temperature; Ethylene-vinyl acetate copolymer (EVA), light uv reflectance are absorbed masterbatch (white) difference 90%, 10% ratio by weight add extruder II, and mixing plasticizing under 150～180 ℃ of temperature conditions; Bimodal medium density polyethylene, far infrared (IR) are intercepted masterbatch, highly enriched black masterbatch difference 88%, 6%, 6% ratio adding extruder III by weight, and mixing plasticizing under 160～190 ℃ of temperature conditions.Above-mentioned three extruders are fused materials respectively, clamp-ons the compound die head in three-layer co-extruded multithread road, and the die head heating-up temperature is 180～190 ℃.Melt is extruded into pipe through compound die head, and feeds compressed air, and pressure is 0.1～0.3MPa.Pipe is 2: 1 inflation film forming bubbles by blow-up ratio.The film bubble is through drawing-off, cooling, coiling film forming volume.Make white/black double-colored greenhouse three layers of laminated film of light reflective multifunctional.
Claims (10)
1, the present invention relates to a kind of agricultural cladding material and preparation method thereof, more particularly, the present invention relates to a kind of greenhouse three layers of laminated film of light reflective multifunctional and preparation method thereof, it is characterized in that: ground floor (skin) is for adding the polyethylene (PE) that the light uv reflectance absorbs masterbatch; The second layer (middle level) is for adding ethylene-vinyl acetate copolymer (EVA) or the ethylene-vinyl acetate copolymer (EVA) and polyethylene (PE) blend that the light uv reflectance absorbs masterbatch; The 3rd layer (internal layer) is for adding the polyethylene (PE) that far infrared (IR) intercepts masterbatch, black masterbatch.
2, greenhouse according to claim 1 three layers of laminated film of light reflective multifunctional, it is characterized in that: ground floor (skin) adopts polyethylene (PE) to be raw material, preferred bimodal medium density polyethylene, it is 8%～10%wt that the light uv reflectance absorbs the masterbatch addition; It is raw material with polyethylene (PE) blend that the second layer (middle level) adopts ethylene-vinyl acetate copolymer (EVA) or ethylene-vinyl acetate copolymer (EVA), the weight ratio of ethylene-vinyl acetate copolymer and polyethylene (PE) blend is 2: 1, and it is 0～10%wt that the light uv reflectance absorbs the masterbatch addition; The 3rd layer (internal layer) adopts polyethylene (PE), preferred bimodal medium density polyethylene, and it is 6%～8%wt that far infrared (IR) intercepts the masterbatch addition.
3, greenhouse according to claim 1 three layers of laminated film of light reflective multifunctional, it is characterized in that: the light uv reflectance that the ground floor (skin) and the second layer (middle level) add absorbs masterbatch, be with metallocene linear-low density polyethylene (mLLDPE), ultra-violet absorber, aluminium powder or rutile type titanium white, processing aid, get by 35%～50%: 15%～25%: 30%～35%: 0～5% percentage by weight is mixed.
4, smooth uv reflectance according to claim 3 absorbs masterbatch, and it is characterized in that: described ultra-violet absorber can be: any one in benzophenone ultra-violet absorber (UV-531), benzotriazole ultra-violet absorber (327,5411), the hydroxy benzenes triazines ultra-violet absorber (UV1164) etc. or any two kinds mixture.
5, smooth uv reflectance according to claim 3 absorbs masterbatch, and it is characterized in that: described aluminium powder is a flake aluminum, aluminium powder thickness≤1 μ m, aluminium powder diameter 〉=10 μ m.
6, greenhouse according to claim 1 three layers of laminated film of light reflective multifunctional, it is characterized in that: the far infrared (IR) that the 3rd layer (internal layer) adds intercepts masterbatch, be with ethylene-vinyl acetate copolymer (EVA), far infrared barrier, processing aid, by 15%～25%: 70%～80%: 0～5% percentage by weight is mixed to be got.
7, far infrared according to claim 6 (IR) intercepts masterbatch, and it is characterized in that: described far infrared barrier can be: calcium carbonate (CaCO
3), talcum powder, mica powder, aluminium hydroxide (Al (OH)
3) any one or any two kinds mixture in waiting.
8, greenhouse according to claim 1 three layers of laminated film of light reflective multifunctional, it is characterized in that: the thickness of ground floor (skin) accounts for 25%～30% of laminated film gross thickness; The thickness of the second layer (middle level) accounts for 40%～50% of laminated film gross thickness; The 3rd layer (internal layer) account for 25%～30% of laminated film gross thickness.
9, greenhouse according to claim 1 three layers of laminated film of light reflective multifunctional, it is characterized in that: ground floor (skin) is silver color or white, and the 3rd layer (internal layer) is black.
10, the greenhouse according to claim 1 preparation method of three layers of laminated film of light reflective multifunctional, it is characterized in that: three layers of mixed ingredients add the mixing melt that plastifies into of extruder respectively, clamp-on the compound die head in three-layer co-extruded multithread road, melt is through compound die head film extrusion base, the compressed air inflation of film base film forming bubble, film bubble through drawing-off, cool off, be wound into the greenhouse with light reflective multifunctional composite membrane.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNA2006100260127A CN1836898A (en) | 2006-04-25 | 2006-04-25 | Light reflective multifunctional composite film for greenhouse and process for preparing same |
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|---|---|---|---|
| CNA2006100260127A CN1836898A (en) | 2006-04-25 | 2006-04-25 | Light reflective multifunctional composite film for greenhouse and process for preparing same |
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