CN111016353A - Five-layer co-extrusion PO film and preparation method thereof - Google Patents
Five-layer co-extrusion PO film and preparation method thereof Download PDFInfo
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- CN111016353A CN111016353A CN201910852351.8A CN201910852351A CN111016353A CN 111016353 A CN111016353 A CN 111016353A CN 201910852351 A CN201910852351 A CN 201910852351A CN 111016353 A CN111016353 A CN 111016353A
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- 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
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- 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
- B32B33/00—Layered products characterised by particular properties or particular surface features, e.g. particular surface coatings; Layered products designed for particular purposes not covered by another single class
-
- 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
- B32B37/00—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding
- B32B37/10—Methods or apparatus for laminating, e.g. by curing or by ultrasonic bonding characterised by the pressing technique, e.g. using action of vacuum or fluid pressure
-
- 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
- B32B38/00—Ancillary operations in connection with laminating processes
- B32B38/16—Drying; Softening; Cleaning
- B32B38/164—Drying
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- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/10—Coating on the layer surface on synthetic resin layer or on natural or synthetic rubber layer
-
- 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
- B32B2255/00—Coating on the layer surface
- B32B2255/24—Organic non-macromolecular coating
Abstract
The invention provides a five-layer co-extrusion PO film and a preparation method thereof, and mainly relates to the field of PO films and preparation processes thereof. A five-layer co-extrusion PO film comprises an outermost layer, a secondary outer layer, a middle layer, a secondary inner layer and an innermost layer, wherein the thickness ratio of the layers is 1:1:1:1:1, and coating liquid is coated on the innermost layer. The invention has the beneficial effects that: the invention has better light transmission performance, stronger heat preservation performance, greatly improved dripping and fog dissipation performance and can provide faster temperature rise and temperature maintenance effect for crops.
Description
Technical Field
The invention mainly relates to the field of PO films and preparation processes thereof, in particular to a five-layer co-extrusion PO film and a preparation method thereof.
Background
The PO film is a novel agricultural film produced by adopting a raw material of high-grade olefin and other auxiliary agents and adopting an external spraying and drying process, and has good transparency, low haze and high transparency. The PO film is used as the covering film of the greenhouse, and the PO film has high light transmittance and low scattering rate, so that the temperature of the greenhouse can be rapidly increased in the morning, and the growth of crops in the greenhouse is facilitated. Compared with PE films and EVA films, the PO films also have stronger tensile strength and tear strength and longer service life.
Although PO membranes have advantages over PE and EVA membranes in terms of performance, there is still room for improvement in performance by themselves. Through long-term research, a PO film with greatly improved light transmission performance, heat preservation performance, dripping and fog dissipation performance is finally produced by five-layer co-extrusion.
Disclosure of Invention
In order to solve the defects of the prior art, the invention provides a five-layer co-extrusion PO film and a preparation method thereof, the five-layer co-extrusion PO film has better light transmission performance and stronger thermal insulation performance, the dripping and fog dissipation performance is greatly improved, and the five-layer co-extrusion PO film can provide faster temperature rise and temperature maintenance effects for crops.
In order to achieve the purpose, the invention is realized by the following technical scheme:
a five-layer co-extrusion PO film comprises an outermost layer, a secondary outer layer, a middle layer, a secondary inner layer and an innermost layer, wherein the thickness ratio of the layers is 1:1:1:1:1, and coating liquid is coated on the innermost layer;
the outermost layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part, dust-proof agent 0.2-0.3 part and opening agent 0.05-0.1 part;
the secondary outer layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, hydrotalcite 1-2 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part;
the middle layer is composed of the following raw materials in parts by weight: 10-15 parts of EVA, 1-2 parts of hydrotalcite, 0.01-0.02 part of ultraviolet absorbent, 0.06-0.1 part of light stabilizer and 0.02-0.03 part of antioxidant;
the secondary inner layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part;
the innermost layer is composed of the following raw materials in parts by weight: LDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part.
Preferably, the EVA raw material adopted by the middle layer has a VA content of 12%.
Preferably, the MLLDPE raw material adopted by the secondary inner layer is XP series MLLDPE.
Preferably, the LDPE feed stock for the innermost layer has a melt index of 0.25.
Preferably, the coating liquid is an organosilicon solution.
Preferably, the mixing ratio of the organic silicon solution to the water is 1: 13.
A preparation method of a five-layer co-extruded PO film comprises the following steps:
s1: respectively batching the five layers according to the formula, and uniformly blending the raw materials by using an automatic mixer;
s2: respectively driving the uniformly mixed raw materials of each layer into corresponding extruders, wherein five extruders are used for the five layers;
s3: extruding the raw materials onto a co-extrusion film head by an extruder, and blowing out film bubbles with corresponding diameters according to the blowing-up ratio of 2.2 under the action of an air ring;
s4: under the traction of a first tractor, the bubble product in the step S3 gradually becomes a flaky film under the action of a bubble stabilizing frame and a propeller strut;
s5: the film product formed in the step S4 is dotted by high voltage of 40-48 dynes of corona machine, so that the film surface is rough;
s6: the film product which is dotted in the step S5 passes through a coating tank, so that a layer of organic silicon nano coating is attached to the surface of the film;
s7: drying the film product coated in the step S6 in an oven;
s8: and (4) under the traction of a tractor, winding and packaging the film dried in the step S7.
Compared with the prior art, the invention has the beneficial effects that:
according to the invention, through a five-layer co-extrusion process, the outermost layer is used as a dust-proof layer, the secondary outer layer and the middle layer are used as heat-insulating layers, the secondary inner layer is used as a reinforcing layer, the innermost layer is a corona coating layer and is supplemented with organic silicon coating liquid, and the produced PO film has more excellent light transmittance, heat-insulating property and dripping fog-eliminating property compared with the standard detection of the polyethylene blow-molding greenhouse film for agriculture of national standard (GB 4455-2006).
Detailed Description
The present invention will be further described with reference to specific examples. It should be understood that these examples are for illustrative purposes only and are not intended to limit the scope of the present invention. Further, it should be understood that various changes or modifications of the present invention may be made by those skilled in the art after reading the teaching of the present invention, and these equivalents also fall within the scope of the present application.
The invention relates to a five-layer co-extrusion PO film which is characterized by comprising an outermost layer, a secondary outer layer, a middle layer, a secondary inner layer and an innermost layer, wherein the thickness ratio of the layers is 1:1:1:1, and coating liquid is coated on the innermost layer; the total thickness of the PO film is 0.1 mm.
The outermost layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part, dust-proof agent 0.2-0.3 part and opening agent 0.05-0.1 part; through adding the dust-proof agent, the adhesive effect of the outermost layer on dust can be greatly reduced, so that the dust is not easy to attach to the surface of the PO film, and the light transmission effect is ensured.
The secondary outer layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, hydrotalcite 1-2 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part;
the middle layer is composed of the following raw materials in parts by weight: 10-15 parts of EVA, 1-2 parts of hydrotalcite, 0.01-0.02 part of ultraviolet absorbent, 0.06-0.1 part of light stabilizer and 0.02-0.03 part of antioxidant;
the secondary inner layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part; the secondary outer layer, the intermediate layer and the secondary inner layer are used as heat preservation and strengthening layers, so that the PO film has better heat preservation performance and stronger tensile strength and tear strength.
The innermost layer is composed of the following raw materials in parts by weight: LDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part. The innermost layer is used for carrying high-pressure dotting of a corona machine and coating the coating liquid, so that high-flow drop defogging performance is obtained.
This PO membrane is through the novel PO membrane of mode output of five layers combination, makes it have higher light transmittance and thermal insulation performance, and the stream drips fog dispersal performance also improves greatly, can keep the effect with the temperature for crops provides faster temperature rise.
Specifically, the VA content in the EVA raw material adopted by the middle layer is 12%. And the EVA raw material with high VA content is adopted, so that the middle layer has higher strength and better flexibility and impact resistance.
Specifically, the MLLDPE raw material adopted by the secondary inner layer is XP series MLLDPE. The metallocene polyethylene is adopted, so that the toughness and the transparency of the PO film are improved.
Specifically, the melt index of the LDPE raw material adopted by the innermost layer is 0.25.
The coating liquid is an organic silicon solution. The organosilicon can make the innermost layer condensate water slide off fast, has low absorption effect on water mist, and has the effects of dripping and dispersing the mist.
A five-layer co-extrusion PO film is characterized in that the mixing ratio of the organic silicon solution is 1: 13.
A preparation method of a five-layer co-extruded PO film comprises the following steps:
s1: respectively batching the five layers according to the formula, and uniformly blending the raw materials by using an automatic mixer;
s2: respectively driving the uniformly mixed raw materials in each layer into corresponding extruders, wherein five extruders are used for the five layers, and the extruders heat and plasticize the raw materials at 180-210 ℃;
s3: extruding the raw materials onto a co-extrusion film head by an extruder, and blowing out film bubbles with corresponding diameters according to an inflation ratio of 2.2 under the action of an air ring at the film head temperature of 190-220 ℃;
s4: under the traction of a first tractor, the bubble product in the step S3 gradually becomes a flaky film under the action of a bubble stabilizing frame and a propeller strut;
s5: the film product formed in the step S4 is dotted by high voltage of 40-48 dynes of corona machine, so that the film surface is rough;
s6: the film product which is dotted in the step S5 passes through a coating tank, so that a layer of organic silicon nano coating is attached to the surface of the film;
s7: drying the film product coated in the step S6 in an oven;
s8: and (4) under the traction of a tractor, winding and packaging the film dried in the step S7.
Example 1:
in this example, the raw material ratios of the respective layers were optimized and the physical properties thereof were examined.
In this embodiment, the outermost layer is composed of the following raw materials in parts by weight: MLLDPE10 parts, ultraviolet absorbent 0.012 part, light stabilizer 0.07 part, antioxidant 0.02 part, dust-proof agent 0.2 part, and opening agent 0.07 part;
the secondary outer layer is composed of the following raw materials in parts by weight: MLLDPE10 parts, hydrotalcite 1.5 parts, ultraviolet absorbent 0.012 parts, light stabilizer 0.07 part, and antioxidant 0.02 part;
the middle layer is composed of the following raw materials in parts by weight: 10 parts of EVA with the VA content of 12%, 1.5 parts of hydrotalcite, 0.012 part of ultraviolet absorbent, 0.07 part of light stabilizer and 0.02 part of antioxidant;
the secondary inner layer is composed of the following raw materials in parts by weight: XP series MLLDPE10 parts, ultraviolet absorbent 0.012 part, light stabilizer 0.07 part, antioxidant 0.02 part;
the innermost layer is composed of the following raw materials in parts by weight: LDPE10 with the melt index of 0.25, 0.012 part of ultraviolet absorbent, 0.07 part of light stabilizer and 0.02 part of antioxidant.
The raw materials are produced by the following steps:
s1: respectively batching the five layers according to the formula, and uniformly blending the raw materials by using an automatic mixer;
s2: respectively driving the uniformly mixed raw materials in each layer into corresponding extruders, wherein five extruders are used for the five layers, and the extruders heat and plasticize the raw materials at 180-210 ℃;
s3: extruding the raw materials onto a co-extrusion film head by an extruder, and blowing out film bubbles with corresponding diameters according to an inflation ratio of 2.2 under the action of an air ring at the film head temperature of 190-220 ℃;
s4: under the traction of a first tractor, the bubble product in the step S3 gradually becomes a flaky film under the action of a bubble stabilizing frame and a propeller strut;
s5: the film product formed in the step S4 is dotted by high voltage of 40-48 dynes of corona machine, so that the film surface is rough;
s6: the film product which is finished by dotting in the step S5 passes through a coating tank in which an organic silicon solution with the ratio of 1:13 is stored, so that an organic silicon nano coating is attached to the surface of the film;
s7: drying the film product coated in the step S6 in an oven;
s8: and (4) under the traction of a tractor, winding and packaging the film dried in the step S7.
The product is inspected, and the main indexes are as follows: tensile strength: longitudinal direction is 33.1MPa, and transverse direction is 37.2 MPa; elongation at break: 754% in the longitudinal direction and 985% in the transverse direction; light transmittance: 91.5 percent; haze: 10.5 percent; initial dropping time: 185 s. The data are averaged over multiple trials.
Example 2:
in this embodiment, the outermost layer is composed of the following raw materials in parts by weight: MLLDPE15 parts, ultraviolet absorbent 0.018 parts, light stabilizer 0.08 parts, antioxidant 0.03 parts, dust-proof agent 0.3 parts and opening agent 0.08 parts;
the secondary outer layer is composed of the following raw materials in parts by weight: MLLDPE15 parts, hydrotalcite 2 parts, ultraviolet absorbent 0.02 part, light stabilizer 0.08 part, and antioxidant 0.03 part;
the middle layer is composed of the following raw materials in parts by weight: 15 parts of EVA (ethylene vinyl acetate) with the VA content of 12%, 2 parts of hydrotalcite, 0.02 part of ultraviolet absorbent, 0.08 part of light stabilizer and 0.03 part of antioxidant;
the secondary inner layer is composed of the following raw materials in parts by weight: XP series MLLDPE15 parts, ultraviolet absorbent 0.02 part, light stabilizer 0.08 part, antioxidant 0.03 part;
the innermost layer is composed of the following raw materials in parts by weight: LDPE15 with the melt index of 0.25, 0.02 part of ultraviolet absorbent, 0.08 part of light stabilizer and 0.03 part of antioxidant.
The production process of example 1 was used to prepare PO membranes and the products were tested, the main criteria being as follows: tensile strength: longitudinal direction is 33.2MPa, and transverse direction is 35.4 MPa; elongation at break: longitudinal 736%, transverse 971%; light transmittance: 91.6 percent; haze: 11 percent; initial dropping time: 188 s. The data are averaged over multiple trials.
The PO film of the invention is compared with the standard detection of polyethylene blow-molded shed film for agriculture of national standard (GB4455-2006) and the common PO film produced by our company in a table:
PO membrane performance comparison meter
Therefore, the PO film produced by adopting the five-layer co-extrusion process has greatly improved mechanical strength, light transmittance, haze and initial dropping time.
Claims (7)
1. The five-layer co-extrusion PO film is characterized by comprising an outermost layer, a secondary outer layer, a middle layer, a secondary inner layer and an innermost layer, wherein the thickness ratio of the outermost layer to the secondary outer layer to the middle layer to the secondary inner layer to the innermost layer is 1:1:1:1, and coating liquid is coated on the innermost layer;
the outermost layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part, dust-proof agent 0.2-0.3 part and opening agent 0.05-0.1 part;
the secondary outer layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, hydrotalcite 1-2 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part;
the middle layer is composed of the following raw materials in parts by weight: 10-15 parts of EVA, 1-2 parts of hydrotalcite, 0.01-0.02 part of ultraviolet absorbent, 0.06-0.1 part of light stabilizer and 0.02-0.03 part of antioxidant;
the secondary inner layer is composed of the following raw materials in parts by weight: MLLDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, antioxidant 0.02-0.03 part;
the innermost layer is composed of the following raw materials in parts by weight: LDPE10-15 parts, ultraviolet absorbent 0.01-0.02 part, light stabilizer 0.06-0.1 part, and antioxidant 0.02-0.03 part.
2. The five-layer co-extruded PO film according to claim 1, wherein: the VA content in the EVA raw material adopted by the middle layer is 12%.
3. The five-layer co-extruded PO film according to claim 1, wherein: the MLLDPE raw material adopted by the secondary inner layer is XP series MLLDPE.
4. The five-layer co-extruded PO film according to claim 1, wherein: the melt index of the LDPE raw material adopted by the innermost layer is 0.25.
5. The five-layer co-extruded PO film according to claim 1, wherein: the coating liquid is an organic silicon solution.
6. The five-layer co-extruded PO film according to claim 5, wherein: the mixing ratio of the organic silicon solution (the ratio of the organic silicon solution to the water is 1: 13) is 1: 13.
7. A preparation method of a five-layer co-extruded PO film is characterized by comprising the following steps: s1: respectively batching the five layers according to the formula, and uniformly blending the raw materials by using an automatic mixer;
s2: respectively driving the uniformly mixed raw materials of each layer into corresponding extruders, wherein five extruders are used for the five layers;
s3: extruding the raw materials onto a co-extrusion film head by an extruder, and blowing out film bubbles with corresponding diameters according to the blowing-up ratio of 2.2 under the action of an air ring;
s4: under the traction of a first tractor, the bubble product in the step S3 gradually becomes a flaky film under the action of a bubble stabilizing frame and a propeller strut;
s5: the film product formed in the step S4 is dotted by high voltage of 40-48 dynes of corona machine, so that the film surface is rough;
s6: the film product which is dotted in the step S5 passes through a coating tank, so that a layer of organic silicon nano coating is attached to the surface of the film;
s7: drying the film product coated in the step S6 in an oven;
s8: and (4) under the traction of a tractor, winding and packaging the film dried in the step S7.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113103702A (en) * | 2021-05-17 | 2021-07-13 | 山东清田塑工有限公司 | High-dustproof high-heat-preservation pesticide-resistant PO (polyolefin) film functional master batch, five-layer co-extruded PO film and preparation method thereof |
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| CN108472685A (en) * | 2015-12-28 | 2018-08-31 | 信越化学工业株式会社 | The manufacturing method of laminated body |
| CN109673334A (en) * | 2019-02-22 | 2019-04-26 | 江苏智信塑胶科技有限公司 | It is a kind of to keep the temperature ageing-resistant fog dispersal agricultural canopy film and preparation method thereof |
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| CN108472685A (en) * | 2015-12-28 | 2018-08-31 | 信越化学工业株式会社 | The manufacturing method of laminated body |
| CN106240103A (en) * | 2016-07-31 | 2016-12-21 | 山东东大塑业有限公司 | One is dispersed and is applied drip defogging film and preparation method thereof outside emitting |
| CN109673334A (en) * | 2019-02-22 | 2019-04-26 | 江苏智信塑胶科技有限公司 | It is a kind of to keep the temperature ageing-resistant fog dispersal agricultural canopy film and preparation method thereof |
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Application publication date: 20200417 |