CN112602517A - Double-layer reflective breathable mulching film and preparation method thereof - Google Patents

Double-layer reflective breathable mulching film and preparation method thereof Download PDF

Info

Publication number
CN112602517A
CN112602517A CN202011468864.8A CN202011468864A CN112602517A CN 112602517 A CN112602517 A CN 112602517A CN 202011468864 A CN202011468864 A CN 202011468864A CN 112602517 A CN112602517 A CN 112602517A
Authority
CN
China
Prior art keywords
layer
reflective
breathable
inorganic porous
double
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202011468864.8A
Other languages
Chinese (zh)
Inventor
高彦峰
张松
李思宇
曹传祥
崔苑苑
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Shangda New Materials Taizhou Research Institute Co ltd
University of Shanghai for Science and Technology
Original Assignee
Shangda New Materials Taizhou Research Institute Co ltd
University of Shanghai for Science and Technology
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shangda New Materials Taizhou Research Institute Co ltd, University of Shanghai for Science and Technology filed Critical Shangda New Materials Taizhou Research Institute Co ltd
Priority to CN202011468864.8A priority Critical patent/CN112602517A/en
Publication of CN112602517A publication Critical patent/CN112602517A/en
Pending legal-status Critical Current

Links

Images

Classifications

    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G13/00—Protecting plants
    • A01G13/02—Protective coverings for plants; Coverings for the ground; Devices for laying-out or removing coverings
    • A01G13/0256—Ground coverings
    • A01G13/0268—Mats or sheets, e.g. nets or fabrics
    • A01G13/0275—Films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/16—Articles comprising two or more components, e.g. co-extruded layers
    • B29C48/18—Articles comprising two or more components, e.g. co-extruded layers the components being layers
    • B29C48/21—Articles comprising two or more components, e.g. co-extruded layers the components being layers the layers being joined at their surfaces
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/25—Component parts, details or accessories; Auxiliary operations
    • B29C48/36—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die
    • B29C48/49—Means for plasticising or homogenising the moulding material or forcing it through the nozzle or die using two or more extruders to feed one die or nozzle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/06—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B27/08—Layered products comprising a layer of synthetic resin as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/30—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers
    • B32B27/304—Layered products comprising a layer of synthetic resin comprising vinyl (co)polymers; comprising acrylic (co)polymers comprising vinyl halide (co)polymers, e.g. PVC, PVDC, PVF, PVDF
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/32—Layered products comprising a layer of synthetic resin comprising polyolefins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B32B27/36—Layered products comprising a layer of synthetic resin comprising polyesters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/02—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/08—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by features of form at particular places, e.g. in edge regions characterised by added members at particular parts
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form
    • B32B3/26—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer
    • B32B3/266—Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar form; Layered products having particular features of form characterised by a particular shape of the outline of the cross-section of a continuous layer; characterised by a layer with cavities or internal voids ; characterised by an apertured layer characterised by an apertured layer, the apertures going through the whole thickness of the layer, e.g. expanded metal, perforated layer, slit layer regular cells B32B3/12
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/40—Properties of the layers or laminate having particular optical properties
    • B32B2307/416—Reflective
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/724—Permeability to gases, adsorption
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2410/00—Agriculture-related articles

Abstract

The invention provides a double-layer reflective breathable mulching film which comprises a reflective layer, a breathable layer and a breathable hole, wherein inorganic porous particles are dispersed in the reflective layer and the breathable layer, and at least part of the inorganic porous particles penetrate through the reflective layer and the breathable layer; the air holes include micropores of inorganic porous particles and interface holes between the inorganic porous particles and the reflective layer or the air-permeable layer. The problems of overhigh soil temperature and overhigh humidity caused by film covering are reduced by the ventilation effect of the inorganic porous particles in the film body.

Description

Double-layer reflective breathable mulching film and preparation method thereof
Technical Field
The invention belongs to the field of agricultural covering films, and particularly relates to a double-layer reflective breathable mulching film and a preparation method thereof.
Background
Photosynthesis of crops is greatly influenced by illumination, and the lack of illumination can cause the problems of yield reduction, quality reduction and the like of the crops. Through the use of the reflection plastic film, the illumination area of the leaves is increased, and the photosynthesis efficiency is improved. Meanwhile, the reflective mulching film can reduce the generation of crop diseases.
The traditional reflective mulching film achieves the purpose of reflecting light by coating a reflective coating on the surface of a resin film, but the conventional reflective mulching film is lack of holes required by air circulation, so that the problems of overhigh soil temperature, overhigh humidity and the like are easily caused. In the prior art, the ventilation property is usually realized by adopting a method of puncturing during mulching film laying, but the method can reduce the tension of the mulching film, reduce the porosity between layers after the mulching film is coated, and influence the efficient utilization of soil water and heat resources.
Based on the above problems, there is a need for a reflective breathable mulching film with holes in advance, which can solve the problems of excessive temperature and humidity of soil caused by ground covering.
Disclosure of Invention
The invention aims to provide a double-layer reflective breathable mulching film, which solves the problems of overhigh soil temperature and overhigh soil humidity caused by film covering through the ventilation effect of inorganic porous particles in a film body.
In order to achieve the purpose, the invention provides a double-layer reflective breathable mulching film which comprises a reflective layer, a breathable layer and a breathable hole, wherein inorganic porous particles are dispersed in the reflective layer and the breathable layer, and at least part of the inorganic porous particles penetrate through the reflective layer and the breathable layer; the air-permeable holes include micropores of inorganic porous particles and interface holes between the inorganic porous particles and the reflective layer and/or the air-permeable layer.
Preferably, the continuous phase of the reflective layer and the breathable layer are both resin layers.
Preferably, the material of the resin layer is one or a combination of polyethylene, polyvinyl chloride, polyethylene terephthalate and polypropylene.
Further preferably, the continuous phase materials of the reflective layer and the breathable layer are the same.
Preferably, the micropores of the inorganic porous particles account for 30-50% of the total amount of the air holes.
Preferably, the inorganic porous particles have a pore size of 20nm to 3 μm.
Preferably, the inorganic porous particles have a specific surface area of 10 to 1000m2/g。
Preferably, the size of the interfacial pores between the inorganic porous particles and the reflective layer and/or the air-permeable layer is 10nm to 1000 nm.
Preferably, the inorganic porous particles account for 5-50% of the total mass of the double-layer reflective breathable mulching film.
More preferably, the inorganic porous particles account for 10-30% of the total mass of the double-layer reflective breathable mulching film.
Preferably, the inorganic porous particles include first inorganic porous particles and second inorganic porous particles, and the first inorganic porous particles penetrate the reflective layer and the gas-permeable layer.
The first inorganic porous particles will be referred to as "through-type porous particles" hereinafter, and the second inorganic porous particles will be referred to as "non-through-type porous particles".
Preferably, the first inorganic porous particles have a particle size ranging from 10 to 1000 μm.
Preferably, the second inorganic porous particles have a particle size ranging from 5 to 800 μm.
Preferably, the first inorganic porous particles account for 5 to 50% of the total mass of the inorganic porous particles.
Preferably, the thickness of the double-layer reflective breathable mulching film is 10-1000 microns.
Preferably, the thickness of the reflecting layer is 3-800 μm; more preferably, the thickness of the reflecting layer is 5 to 500 μm.
Preferably, the thickness of the air-permeable layer is 3-800 μm; more preferably, the thickness of the air-permeable layer is 5 to 500 μm.
Preferably, the first inorganic porous particles have a particle diameter not smaller than the sum of thicknesses of the reflective layer and the air-permeable layer.
Preferably, the reflective layer is a resin layer in which reflective particles are dispersed. The reflective particles are materials which can reflect incident light of visible light within the wavelength range of 0.4-0.7 μm and enable the light, the reflected light, the incident light and the normal to be in the same plane.
Further preferably, the reflective particles are at least one of aluminum, copper, silver, zinc, and gold particles.
Preferably, the inorganic porous particles are at least one of porous kaolin, porous diatomite, porous sepiolite, porous talcum powder, porous alumina, porous zinc oxide, porous hydrotalcite, porous barium sulfate, porous tourmaline, porous magnesium oxide and porous titanium dioxide.
Preferably, the first inorganic porous particles are at least one of porous kaolin, porous diatomaceous earth and porous sepiolite.
Preferably, the reflective layer further has an ultraviolet absorber dispersed therein. The ultraviolet absorbent is a substance capable of absorbing ultraviolet rays with the wavelength range of 10-400 nm.
Preferably, the ultraviolet absorber is 2- (2 ' -hydroxy-5 ' -methylphenyl) benzotriazole, 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, 2-hydroxy-4-n-octoxybenzophenone, 2- (2 ' -hydroxy-3 ', 5 ' -di-tert-phenyl) -5-chlorobenzotriazole, resorcinol monobenzoate, 2, 2 '-thiobis (4-tert-octylphenoloxy) nickel, 4-benzoyloxy-2, 2, 6, 6-tetramethylpiperidine, 2,4, 6-tris (2' n-butoxyphenyl) -1, 3, 5-triazine, hexamethylphosphoric triamide, tin oxide, titanium dioxide.
Preferably, the ultraviolet absorbent accounts for 0.01-5% of the total mass of the double-layer reflective breathable mulching film.
Preferably, an anti-aging agent is dispersed in the reflecting layer and the breathable layer. The anti-aging agent is a substance which can be combined with free radicals generated by resin molecules due to oxidation, illumination and heating, so that the transfer of the free radicals is stopped, and the aging is stopped.
Preferably, the anti-aging agent accounts for 0.01-5% of the total mass of the double-layer reflective breathable mulching film.
Preferably, the reflective breathable film is prepared by tape casting or blow molding.
The invention also provides a tape casting method of the double-layer reflective breathable mulching film, which comprises the following steps:
(1) mixing and feeding: weighing 50-95 wt% of resin particles, 0-50 wt% of inorganic porous particles and 0.01-5 wt% of anti-aging agent, mixing, and putting into a first extruder; weighing 50-95 wt% of resin particles, 1-20 wt% of reflective particles, 0.01-5 wt% of anti-aging agent and 0-50 wt% of inorganic porous particles, mixing, and feeding into a second extruder; wherein the inorganic porous particles account for 5-50% of the total weight of the material;
(2) melt co-extrusion: the temperature of five temperature zones of the two extruders is set to be 90-260 ℃, 100-260 ℃, 110-260 ℃, 150-260 ℃, 170-260 ℃, the screw rotation speed is 10-260 r/min, the die head temperature is 120-260 ℃, the extrusion is carried out, and the melt of the first extruder and the melt of the second extruder enter a casting machine through laminar flow distribution;
(3) tape casting: setting the rotating speed of the screw to be 10-50 r/min, setting the traction speed to be 1-50 m/min, and setting the cooling temperature to be 3-40 ℃ for tape casting;
(4) traction and winding: and cutting the formed film, carrying out corona treatment, and then carrying out traction and rolling to obtain a double-layer reflective breathable mulching film product.
When the tape casting is carried out in the step (3), the film in a molten state is extruded, the thickness is reduced, and when the thickness of the film does not exceed the diameter of the inorganic porous particles, the inorganic porous particles penetrate through the film.
Preferably, the resin particles in step (1) are at least one of polyethylene, polyvinyl chloride, polyethylene terephthalate and polypropylene particles.
Preferably, in the case where the inorganic porous particles are all through-type porous particles in the step (1), the inorganic porous particles may be fed only into the first extruder or the second extruder and mixed, or may be fed into two extruders and mixed.
Preferably, when the inorganic porous particles in the step (1) include a through type and a non-through type, the inorganic porous particles are fed into the first extruder or the second extruder at a certain ratio and mixed.
The invention also provides a blow molding method of the double-layer reflective breathable mulching film, which comprises the following steps:
(A) mixing and feeding: weighing 50-95 wt% of resin particles and 0-50 wt% of inorganic porous particles, mixing, and putting into a first extruder; weighing 50-95 wt% of resin particles, 1-20 wt% of reflective particles and 0-50 wt% of inorganic porous particles, mixing, and putting into a second extruder; wherein the inorganic porous particles account for 5-50% of the total weight of the material;
(B) melt co-extrusion: the temperature of five temperature zones of the first extruder and the second extruder is set to be 90-260 ℃, 100-260 ℃, 110-260 ℃, 150-260 ℃, 170-260 ℃, the screw rotation speed is 10-260 r/min, the temperature of a die head is 120-260 ℃, and the melt extruded by the first extruder and the second extruder enters a blow molding machine through laminar flow distribution;
(C) blow molding: setting the blow-up ratio to be 2-4; setting the traction ratio to be 2-8 for blow molding;
(D) cooling and drawing: cooling the blown film at 20-30 ℃ by an air ring, then feeding the film into a traction roller through a herringbone clamping plate for traction, and simultaneously slitting;
(E) and (3) post-treatment: and carrying out corona treatment, inspection and packaging on the cut film to obtain a double-layer reflective breathable mulching film product.
Preferably, the resin particles in step (1) are at least one of polyethylene, polyvinyl chloride, polyethylene terephthalate and polypropylene particles.
Preferably, the step (1) and the step (F) further comprise weighing 0.01-5 wt% of an ultraviolet absorbent, 50-95 wt% of resin particles, 1-20 wt% of reflective particles, 0.01-5 wt% of an anti-aging agent and 0-50 wt% of inorganic porous particles, mixing, and feeding into a second extruder.
Preferably, the inorganic porous particles in the steps (1) and (F) include first inorganic porous particles and second inorganic porous particles, and the first inorganic porous particles account for 5 to 50% of the total mass of the inorganic porous particles.
More preferably, the first inorganic porous particles have a particle size of 10 to 100 μm.
Preferably, when the resin particles are polyethylene, the temperature of the five temperature zones of the first extruder and the second extruder in the step (2) is set to 160-180 ℃, 170-190 ℃, 170-200 ℃, 180-190 ℃ and 180-200 ℃.
Preferably, when the resin particles are polyvinyl chloride, the temperature of the five temperature zones of the first extruder and the second extruder in the step (2) is set to be 140-180 ℃, 150-180 ℃, 160-200 ℃, 160-190 ℃ and 160-200 ℃.
Preferably, when the resin particles are polyethylene terephthalate, the five temperature zones of the first extruder and the second extruder in the step (2) are set to be 190-240 ℃, 200-250 ℃ and 200-260 ℃.
Preferably, when the resin particles are polypropylene, the temperature of the five temperature zones of the first extruder and the second extruder in the step (2) is set to be 150-180 ℃, 160-190 ℃, 160-200 ℃ and 160-210 ℃.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the reflective particles are added in the reflective layer, so that light irradiated to the ground can be reflected to the back of the leaves of crops, and the illumination intensity of the crops is improved, thereby improving the photosynthesis efficiency, increasing the yield of the crops and improving the quality of the crop products.
2. After the double-layer breathable reflective breathable mulching film is laid, the illumination intensity borne by the back of the plant leaves is increased, so that crop pests can be effectively driven, and the yield and the quality of crops are improved.
3. According to the invention, the inorganic porous particles are added into the double-layer mulching film, so that air on the upper surface and the lower surface of the mulching film can circulate through the air holes, thereby reducing the problems of poor heat dissipation, poor moisture permeability and the like caused by covering, and reducing the temperature and humidity of soil.
4. The invention provides a plurality of air circulation channels for the mulching film by adding the inorganic porous particles, the air circulation channels comprise micropore channels provided by the through type porous particles, interface hole channels between the through type porous particles and the reflecting layer and the air permeable layer, joint channels formed by micropores of the non-through type inorganic porous particles, interface hole joint channels, joint channels formed by the interface holes and the micropores of the porous particles and the like, and the air circulation channels are diversified, so that the double-layer mulching film has excellent air permeability.
5. The air circulation channels in the invention have irregular shapes and random distribution, thereby not only ensuring the air permeability of the mulching film, but also not occupying the reflective area like the needling holes, thereby increasing the reflective area and reflective efficiency of the mulching film and providing more sufficient illumination intensity for crops.
Drawings
FIG. 1 is a schematic structural view of a double-layer reflective breathable mulch film according to the present invention;
FIG. 2 is a schematic structural view of another double-layer reflective air-permeable mulching film provided by the present invention;
FIG. 3 is a flow chart of a tape casting method for a double-layer reflective air-permeable mulching film according to the present invention;
fig. 4 is a flow chart of a blow molding method of the double-layer reflective breathable mulching film provided by the invention.
Detailed Description
In order that the present invention may be more readily and clearly understood, reference is now made to the following detailed description taken in conjunction with the accompanying drawings.
Example 1
A double-layer reflective breathable mulching film 1 is shown in figure 1 and comprises a reflective layer 11, a breathable layer 12 and a breathable hole 13, wherein the thickness of the reflective layer 11 is 50 microns, the thickness of the breathable layer 12 is 50 microns, and the size of the breathable hole 13 is 10 nm-1 micron. Wherein, the reflection layer 11 and the ventilation layer 12 are both dispersed with an anti-aging agent of pentaerythritol tetrakis (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate), an ultraviolet absorbent of 2-hydroxy-4-n-octoxybenzophenone, and porous diatomite 14, the average particle size of the porous diatomite is 100 μm, the pore diameter is 200-600 nm, and the pore volume is 0.6-0.8 cm3(ii) in terms of/g. The porous diatomite 14 penetrates through the reflecting layer 11 and the breathable layer 12, and the specific surface area of the porous diatomite 14 is 60-100 m2(ii)/g; the air holes 13 comprise micropores 131 of the porous diatomite 14 and interface holes 132 between the porous diatomite 14 and the reflecting layer 11 and/or the air-permeable layer 12, and the size distribution of the interface holes 132 is 10 nm-1 μm; and the continuous phase materials of the reflecting layer and the breathable layer are all polyvinyl chloride.
The reflecting layer 11 is also dispersed with aluminum reflecting particles 15, and the particle size range of the aluminum reflecting particles 15 is 1-10 μm.
As shown in fig. 1, the mulching film 1 provides two types of air flow passages, namely a passage T1 formed by micropores of the porous diatomite 14 and a passage T2 formed by the micropores of the porous diatomite 14 and an interface hole between the reflective layer 11 and the air-permeable layer 12.
As shown in fig. 1, the reflective layer 11 of the mulching film 1 has the aluminum reflective particles 15 uniformly dispersed therein, so that the reflective area and the reflective efficiency of the mulching film are increased, and sufficient illumination intensity is provided for crops. The light reflection path is shown by arrow R1.
Using UV-visible light for spectroscopyThe reflectivity of the reflective breathable mulching film 1 is measured by a photometer, and reaches 27%; the air permeability of the mulching film 1 is tested according to the test method required by GB/T1038-2000, and the air permeability reaches 3960 (cm)3/(m224h 0.1MPa), and the air permeability coefficient reaches 1.19E-17 (cm)3·cm/m2·h·0.1MPa)。
In other preferred embodiments, the continuous phase material of the reflective layer and the air-permeable layer may also be different, such as polyvinyl chloride for the reflective layer and polyethylene terephthalate for the air-permeable layer. The same or different resin materials can be selected as the continuous phase component according to actual needs.
Example 2
A double-layer reflective breathable mulching film 2 comprises a reflective layer 21, a breathable layer 22 and a breathable hole 23, wherein the reflective layer 21 is 100 microns thick, the breathable layer 22 is 100 microns thick, and the size of the breathable hole 23 is 10-30 microns. Wherein, the reflecting layer 21 and the air permeable layer 22 are both dispersed with pentaerythritol tetra (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate) ester as an anti-aging agent, 2-hydroxy-4-n-octoxybenzophenone as an ultraviolet absorbent and porous kaolin 24, the porous kaolin 24 comprises a through porous kaolin 241 with the average particle size of 200 μm and a non-through porous kaolin 242 with the average particle size of 100 μm, wherein the pore diameter of the porous kaolin 241 is 300-500 nm, and the specific surface area is 150-200 m2The pore diameter of the porous kaolin 242 is 200-300 nm, and the specific surface area is 200-300 m2G,; the air holes 23 comprise micropores 2411 of the porous kaolin 24 and interface holes 2422 between the porous kaolin 24 and the reflecting layer 21 and/or the air permeable layer 22, and the size distribution of the interface holes 2422 is 10 nm-20 μm; and the continuous phase materials of the reflecting layer and the breathable layer are both polypropylene.
The reflecting layer 21 also has zinc reflecting particles 25 dispersed therein, the particle size range being 1 to 10 μm.
As shown in fig. 2, the mulching film 2 provides two types of air flow passages, one is a passage T3 formed by micropores of the porous kaolin 24, and the other is a passage T4 formed by the interface holes between the porous kaolin 24 and the reflective layer 21 and the air-permeable layer 22.
As shown in fig. 2, the zinc reflective particles 25 are uniformly dispersed in the reflective layer 21 of the mulching film 2, so that the reflective area and the reflective efficiency of the mulching film are increased, and sufficient illumination intensity is provided for crops. The light reflection path is shown by arrow R2.
Measuring the reflectivity of the reflective breathable mulching film 2 by using an ultraviolet-visible spectrophotometer, wherein the reflectivity reaches 25%; the air permeability of the mulching film 2 is tested according to the test method required by GB/T1038-2000, and the air permeability reaches 3560 (cm)3/(m224h 0.1MPa), and the air permeability coefficient reaches 1.16E-17 (cm)3·cm/m2·h·0.1MPa)。
Example 3
A tape casting method of a double-layer reflecting breathable mulching film 3 is shown in figure 3 and comprises the following steps:
(1) mixing and feeding: weighing 8kg of polyethylene resin particles and 1.5kg of polyethylene resin particles with the particle size of 100-200 mu m and the specific surface area of 80-120 m2Mixing porous sepiolite particles per gram, 0.25kg of pentaerythritol tetrakis (3, 5-di-tert-butyl-4-hydroxyhydrocinnamate) as an anti-aging agent, and 0.25kg of 2-hydroxy-4-methoxybenzophenone as an ultraviolet absorber, and feeding the mixture into a first extruder; weighing 7kg of polyethylene resin particles, 0.5kg of aluminum reflective particles with the particle size of 1-20 microns, 0.25kg of anti-aging agent, 0.25kg of ultraviolet absorbent, 2kg of polyethylene resin particles with the particle size of 50-100 microns and the specific surface area of 50-80 m2Mixing porous sepiolite per gram, and putting the mixture into a second extruder;
(2) melt co-extrusion: the temperature of five temperature zones of the two extruders is set to be 170 ℃, 180 ℃, 190 ℃, the rotating speed of a screw is set to be 100r/min, the temperature of a die head is 180 ℃ for extrusion; the melt extruded by the first extruder and the second extruder enters a casting machine through laminar flow distribution;
(4) tape casting: setting the rotating speed of the screw to be 50r/min, setting the traction speed to be 30m/min, setting the cooling temperature to be 30 ℃, and carrying out tape casting;
(5) traction and winding: cutting the formed film, carrying out corona treatment, and then carrying out traction and rolling to obtain a double-layer reflective breathable mulching film 3 with the thickness of 200 mu m; wherein the thickness of the reflecting layer is 100 μm, and the thickness of the air-permeable layer is 100 μm.
Using ultraviolet lightThe reflectance of the reflecting breathable mulch film 3 is measured by a visible spectrophotometer, and reaches 26%; the air permeability of the mulching film 3 is tested according to the test method required by GB/T1038-2000, and the air permeability reaches 3600 (cm)3/(m224h 0.1MPa), and the air permeability coefficient reaches 1.20E-17 (cm)3·cm/m2·h·0.1MPa)。
Example 4
A blow molding method of a double-layer reflective breathable mulching film 4 is shown in figure 4 and comprises the following steps:
(A) mixing and feeding: weighing 8kg of polyethylene resin particles, wherein 2kg of polyethylene resin particles have an average particle size of 400 mu m and a specific surface area of 40-80 m2Mixing 0.2kg of tris (2, 4-di-tert-butylphenyl) phosphite serving as an anti-aging agent and 0.2kg of 2- (2 '-hydroxy-5' -methylphenyl) benzotriazole serving as an ultraviolet absorber per gram of porous sepiolite and the mixture, and then feeding the mixture into a first extruder; weighing 8kg of polyethylene particles, 0.16kg of zinc particles with the diameter of 3-100 mu m as reflecting particles, 0.12kg of 5-tert-butyl-4-hydroxy-2-methylphenylsulfanyl ether as an anti-aging agent and 0.16kg of an ultraviolet absorbent, mixing, and feeding into a second extruder.
(B) Melt co-extrusion: the temperature of five temperature zones of the first extruder and the second extruder are set as follows: extruding at 160 deg.C, 170 deg.C, 180 deg.C, 190 deg.C, screw rotation speed of 100r/min, and die head temperature of 180 deg.C; the melt extruded by the first extruder and the second extruder enters a blow molding machine through laminar flow distribution.
(C) Inflation/traction: the blow-up ratio was set to 4; the draft ratio was set to 5 for blowing.
(D) And cooling the blown film by an air ring at 20-30 ℃, then feeding the film into a traction roller through a herringbone clamping plate for traction, and simultaneously slitting.
(E) And (3) post-treatment: carrying out corona treatment, inspection and packaging on the cut film to obtain a double-layer reflective breathable mulching film 4 with the thickness of 400 mu m; wherein the thickness of the reflecting layer is 200 μm, and the thickness of the air-permeable layer is 200 μm.
Measuring the reflectivity of the reflective breathable mulching film 4 by using an ultraviolet-visible spectrophotometer, wherein the reflectivity reaches 28%; according to GB/T1038-2000The testing method is used for testing the air permeability of the mulching film 4, and the air permeability reaches 3340 (cm)3/(m224h 0.1MPa), and the air permeability coefficient reaches 1.10E-17 (cm)3·cm/m2·h·0.1MPa)。
It is to be understood that the above examples are illustrative only for the purpose of clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications of the invention may be made without departing from the spirit or scope of the invention.

Claims (10)

1. A double-layer reflective breathable mulching film comprises a reflective layer, a breathable layer and air holes, and is characterized in that inorganic porous particles are dispersed in the reflective layer and the breathable layer, and at least part of the inorganic porous particles penetrate through the reflective layer and the breathable layer; the air-permeable holes include micropores of inorganic porous particles and interface holes between the inorganic porous particles and the reflective layer and/or the air-permeable layer.
2. The double-layer reflective breathable mulch film according to claim 1, wherein the continuous phase of the reflective layer and the breathable layer are both resin layers.
3. The double-layer reflective breathable mulching film according to claim 2, wherein the resin layer is made of one or more of polyethylene, polyvinyl chloride, polyethylene terephthalate, and polypropylene.
4. The double-layer reflective breathable mulching film according to claim 1, wherein the inorganic porous particles have a pore size of 20nm to 3 μm and a specific surface area of 10 to 1000m2/g。
5. The double-layer reflective breathable mulch film of claim 1, wherein the inorganic porous particles comprise first inorganic porous particles and second inorganic porous particles, the first inorganic porous particles penetrating the reflective layer and the breathable layer.
6. The double-layer reflective breathable mulch film according to claim 5, wherein the first inorganic porous particles have a particle size ranging from 10 to 1000 μm; the second inorganic porous particles have a particle size in the range of 5 to 800 μm.
7. The double-layer reflective breathable mulching film according to claim 1, 5 or 6, wherein the inorganic porous particles are at least one of porous kaolin, porous diatomaceous earth, porous sepiolite, porous talc, porous alumina, porous zinc oxide, porous hydrotalcite, porous barium sulfate, porous tourmaline, porous magnesium oxide and porous titanium dioxide.
8. The double-layer reflective breathable mulch film according to claim 1, wherein the reflective particles are at least one of aluminum, copper, silver, zinc, gold particles.
9. The double-layer reflective breathable mulch film according to claim 1, wherein the size of the interfacial pores between the inorganic porous particles and the reflective layer and/or the breathable layer is 10nm to 1000 nm.
10. The double-layer reflective breathable mulching film according to claim 1, wherein the reflective breathable mulching film is prepared by a tape casting method or a blow molding method.
CN202011468864.8A 2020-12-15 2020-12-15 Double-layer reflective breathable mulching film and preparation method thereof Pending CN112602517A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202011468864.8A CN112602517A (en) 2020-12-15 2020-12-15 Double-layer reflective breathable mulching film and preparation method thereof

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202011468864.8A CN112602517A (en) 2020-12-15 2020-12-15 Double-layer reflective breathable mulching film and preparation method thereof

Publications (1)

Publication Number Publication Date
CN112602517A true CN112602517A (en) 2021-04-06

Family

ID=75233797

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202011468864.8A Pending CN112602517A (en) 2020-12-15 2020-12-15 Double-layer reflective breathable mulching film and preparation method thereof

Country Status (1)

Country Link
CN (1) CN112602517A (en)

Similar Documents

Publication Publication Date Title
DE69635810T2 (en) THERMOPLASTIC INHERENT SHEET
US6890645B2 (en) Photocatalytic sheet or film and its manufacturing process
DE69923075T2 (en) THERMOPLASTIC INHERENT SHEET
DE60128814T3 (en) ENCAPSULATED BARRIER FOR FLEXIBLE FILMS AND MANUFACTURING METHOD
EP0678607A2 (en) Polypropylene monoaxially oriented material, woven or non-woven fabric, laminated product and preparation method
CN1133536C (en) Reduced die lip buildup extrusion of polymer compositions
KR102245864B1 (en) Polyolefin-type agricultural film, and facility for agriculture and horticulture
CN1836898A (en) Light reflective multifunctional composite film for greenhouse and process for preparing same
CN108867190B (en) Slow-release fruit and vegetable fresh-keeping paper film and preparation method and application thereof
EP3233470B1 (en) Monolithic breathable film and composite manufactured therefrom
CN106585010A (en) PVDF film for double-layer co-extrusion photovoltaic back plate and preparation method thereof
KR101518560B1 (en) Reflective house wrap with good durability
CN102756521A (en) Infrared absorption heat preservation film
CN214430628U (en) Double-layer reflective breathable mulching film
CN112602517A (en) Double-layer reflective breathable mulching film and preparation method thereof
CN1133535C (en) Improved polypropylene pearlescent synthetic paper making method
CN206510542U (en) It is a kind of it is three-layer co-extruded go out polyvinylidene difluoride film
CN110272551A (en) A kind of polylactic acid film and preparation method thereof
RU2316427C2 (en) Thin packaging laminated sheet production method and device
JPH08205694A (en) Film for plant culture and culture of plant
FI123440B (en) Process for forming a wood composite product, wood composite product, and manufacturing device for a wood composite product
EP3569410B1 (en) Agriculture covering film for greenhouses with high ir effectiveness, and shielding effect to n.i.r. radiations, gained with utilization of hollow glass microspheres, and relevant production method
KR20220083299A (en) Agricultural porous laminated film with excellent high temperature reduction effect
JP2011178159A (en) Agricultural covering material
KR102445576B1 (en) Porous agricultural mulching laminate film capable of controlling light reflection and its manufacturing method

Legal Events

Date Code Title Description
PB01 Publication
PB01 Publication
SE01 Entry into force of request for substantive examination
SE01 Entry into force of request for substantive examination