CN111253662A - Multilayer heat-preservation environment-friendly film and preparation method thereof - Google Patents

Multilayer heat-preservation environment-friendly film and preparation method thereof Download PDF

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CN111253662A
CN111253662A CN202010157315.2A CN202010157315A CN111253662A CN 111253662 A CN111253662 A CN 111253662A CN 202010157315 A CN202010157315 A CN 202010157315A CN 111253662 A CN111253662 A CN 111253662A
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parts
heat
raw materials
insulating
preparing
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张龙鑫
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Fujian Ruixing Textile Technology Co Ltd
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Fujian Ruixing Textile Technology Co Ltd
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    • C08J5/18—Manufacture of films or sheets
    • 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
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    • B32—LAYERED PRODUCTS
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    • 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
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    • B32B27/00—Layered products comprising a layer of synthetic resin
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Abstract

The invention discloses a multilayer heat-insulating environment-friendly film and a preparation method thereof, wherein the multilayer heat-insulating environment-friendly film is sequentially provided with a weather-resistant surface layer, a heat-insulating layer and an inner layer from top to bottom; the raw materials for preparing the weather-resistant surface layer comprise: polyethylene resin, composite light stabilizer, antioxidant and light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: polylactic acid, linear low-density polyethylene, modified straw fiber, glass beads, hydroxy cellulose, chlorinated polyethylene wax, titanium dioxide and a compatilizer; the raw materials for preparing the inner layer comprise: polyvinyl chloride, an antioxidant, wood fiber, zinc stearate, montmorillonite, ethyl silicone oil, zinc stearate and nano silicon dioxide. The multilayer heat-insulating environment-friendly film prepared by the invention has the advantages of easily available raw materials, reasonable proportion, excellent heat-insulating property, excellent mechanical property, difficult tearing, long service life, degradability, no environmental pollution, simple preparation method, easy preparation process operation and suitability for wide popularization.

Description

Multilayer heat-preservation environment-friendly film and preparation method thereof
Technical Field
The invention relates to the technical field of film materials, in particular to a multilayer heat-preservation environment-friendly film and a preparation method thereof.
Background
Plastic films are widely used in various industries because of their advantages such as good transparency, good moisture-holding property, excellent heat resistance, and convenience in use. When the agricultural plastic film is used in the greenhouse cultivation industry, the agricultural plastic film has excellent heat preservation performance, but the service life is influenced and the heat preservation performance is poor due to the fact that the existing plastic film is thin. With the enhancement of environmental awareness of people, the direct discarding of the waste plastic film can also bring about serious white pollution. Therefore, a degradable plastic film having excellent heat insulation property and long service life is urgently needed.
Chinese patent CN109535759A discloses a degradable packaging film; the composition comprises the following components in parts by mass: 18-32 parts of polyvinyl chloride, 30-50 parts of straw fiber, 10-20 parts of chitosan, 2.4-4.2 parts of epoxy modified organic silicon resin, 2-3.6 parts of trimethyl borate, 4.5-5.8 parts of oxidized polyethylene wax, 12-15 parts of polybutylene terephthalate, 4-6 parts of polychlorotrifluoroethylene, 0.3-0.5 part of titanium dioxide, 3-4 parts of a coupling agent, 4-8 parts of a flame retardant, 1-3 parts of a curing agent, 1.2-2.4 parts of polyvinyl alcohol, 1-3 parts of a compatilizer and 0.4-0.8 part of a degradation accelerator. However, the degradable packaging film prepared by the patent has poor heat insulation performance.
Chinese patent CN107556580A discloses a plastic film for a greenhouse, which comprises the following components in parts by weight: 70-75 parts of polyethylene, 13-18 parts of rubber, 4-6 parts of a stabilizer, 6-7 parts of cotton, 3-4 parts of an antioxidant, 8-9 parts of acrylonitrile, 3-5 parts of butadiene and 4-6 parts of styrene. The invention not only has good toughness, but also prevents the plastic from being disconnected, and can prolong the service life of the plastic film. However, the plastic film for the greenhouse prepared by the patent is not degradable and causes white pollution.
Disclosure of Invention
Aiming at the problems, the invention provides a multilayer heat-insulating environment-friendly film and a preparation method thereof.
The technical scheme adopted by the invention for solving the problems is as follows: a multilayer heat-insulating environment-friendly film is characterized in that a weather-resistant surface layer, a heat-insulating layer and an inner layer are sequentially arranged from top to bottom; the raw materials for preparing the weather-resistant surface layer comprise: polyethylene resin, composite light stabilizer, antioxidant and light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: polylactic acid, linear low-density polyethylene, modified straw fiber, glass beads, hydroxy cellulose, chlorinated polyethylene wax, titanium dioxide and a compatilizer; the raw materials for preparing the inner layer comprise: polyvinyl chloride, an antioxidant, wood fiber, zinc stearate, montmorillonite, ethyl silicone oil, zinc stearate and nano silicon dioxide.
Further, the raw materials for preparing the weather-resistant surface layer comprise the following components in parts by weight: 50 parts of polyethylene resin, 1.5-3.5 parts of composite light stabilizer, 0.2-0.45 part of antioxidant and 10-18 parts of light calcium carbonate.
Further, the raw materials for preparing the heat-insulating layer comprise the following components in parts by weight: 40 to 60 parts of polylactic acid, 100 parts of linear low-density polyethylene, 20 to 45 parts of modified straw fiber, 1.2 to 2.5 parts of glass microsphere, 1.5 to 3.5 parts of hydroxy cellulose, 6 to 8.5 parts of chlorinated polyethylene wax, 0.6 to 1.2 parts of titanium dioxide and 1.2 to 2.5 parts of compatilizer.
Further, the raw materials for preparing the inner layer comprise the following components in parts by weight: 50 parts of polyvinyl chloride, 10-15 parts of wood fiber, 3-5 parts of zinc stearate, 6-12 parts of montmorillonite, 0.5-1.5 parts of ethyl silicone oil, 0.8-1.4 parts of nano silicon dioxide, 0.2-1.2 parts of zinc stearate and 0.1-0.8 part of antioxidant.
Further, the composite light stabilizer is UV-50, and the light stabilizer AM-101 is in a weight ratio of 10: 15-30. The light stabilizer AM-101 has excellent light stabilizing effect on the film, and can be used together with UV-50 to prevent the film from photooxidative degradation and improve the anti-fading capability of the film product.
Further, the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min.
Further, the preparation method of the modified straw fiber comprises the following steps: crushing plant straws into powder, soaking the powder in a sodium hydroxide solution with the concentration of 12-18% for 2-3.5 hours, and drying the powder at a low temperature until the water content is 3-5%; adding 12 to 16 percent of diatomite, 1.2 to 2.2 percent of silane coupling agent and 2.3 to 3.5 percent of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
Further, the temperature of low-temperature drying is 45-55 ℃.
The invention also aims to provide a preparation method of the multilayer heat-preservation environment-friendly film, which comprises the following steps:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 150-165 ℃, adding the first mixture obtained in the step S30, stirring and heating to 170-175 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
The invention has the advantages that:
(1) the multilayer heat-insulating environment-friendly film prepared by the invention is obtained from a weather-resistant surface layer, a heat-insulating layer and an inner layer, wherein the weather-resistant surface layer is added with a composite heat stabilizer, so that the photooxidation degradation of the film can be prevented, and the anti-fading capability of a film product is improved; the heat-insulating layer takes polylactic acid, linear low-density polyethylene and modified straw fiber as main raw materials, and other auxiliary agents are added to improve the mechanical property of the polylactic acid, and the straw fiber is modified to improve the heat-insulating property, so that the energy conservation and emission reduction are realized, the production cost is reduced, and the dispersibility of the straw fiber in the polylactic acid and the polyethylene is improved; the inner layer takes polyvinyl chloride as a main raw material, and the strength of the inner layer of the film is improved by adding other auxiliary agents;
(2) the multilayer heat-insulating environment-friendly film prepared by the invention has the advantages of easily available raw materials, reasonable proportion, excellent heat-insulating property, excellent mechanical property, difficult tearing, long service life, degradability, no environmental pollution, simple preparation method, easy preparation process operation and suitability for wide popularization.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below.
Detailed Description
The following detailed description of embodiments of the invention, but the invention can be practiced in many different ways, as defined and covered by the claims.
Example 1
Multilayer heat-preservation environment-friendly film and preparation method thereof
The raw materials for preparing the weather-resistant surface layer comprise: 50kg of polyethylene resin, 2.5kg of composite light stabilizer, 0.32kg of antioxidant and 14kg of light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: 50kg of polylactic acid, 100kg of linear low-density polyethylene, 35kg of modified straw fiber, 1.8kg of glass microsphere, 2.5kg of hydroxy cellulose, 7.2kg of chlorinated polyethylene wax, 0.9kg of titanium dioxide and 1.8kg of compatilizer; the raw materials for preparing the inner layer comprise: 50kg of polyvinyl chloride, 12kg of wood fiber, 4kg of zinc stearate, 9kg of montmorillonite, 1.0kg of ethyl silicone oil, 1.1kg of nano silicon dioxide, 0.7kg of zinc stearate and 0.45kg of antioxidant; the composite light stabilizer is UV-50 and the light stabilizer AM-101 in a weight ratio of 10: 22; the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min; the preparation method of the modified straw fiber comprises the following steps: crushing plant straws into powder, soaking the powder in a 15% sodium hydroxide solution for 2.5 hours, and drying the powder at a low temperature of 50 ℃ until the water content is 3-5%; adding 14% of diatomite, 1.7% of silane coupling agent and 2.9% of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
The multilayer heat-insulating environment-friendly film is prepared by the following method:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 15 ℃, adding the first mixture obtained in the step S30, stirring and heating to 173 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
Example 2
Multilayer heat-preservation environment-friendly film and preparation method thereof
The raw materials for preparing the weather-resistant surface layer comprise: 50kg of polyethylene resin, 1.5kg of composite light stabilizer, 0.2kg of antioxidant and 10kg of light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: 40kg of polylactic acid, 100kg of linear low-density polyethylene, 20kg of modified straw fiber, 1.2kg of glass microsphere, 1.5kg of hydroxy cellulose, 6kg of chlorinated polyethylene wax, 0.6kg of titanium dioxide and 1.2kg of compatilizer; the raw materials for preparing the inner layer comprise: 50kg of polyvinyl chloride, 10kg of wood fiber, 3kg of zinc stearate, 6kg of montmorillonite, 0.5kg of ethyl silicone oil, 0.8kg of nano silicon dioxide, 0.2kg of zinc stearate and 0.1kg of antioxidant; the composite light stabilizer is UV-50 and the light stabilizer AM-101 in a weight ratio of 10: 15; the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min; the preparation method of the modified straw fiber comprises the following steps: crushing plant straws into powder, soaking the powder in a sodium hydroxide solution with the concentration of 12% for 3.5 hours, and drying the powder at a low temperature of 45 ℃ until the water content is between 3 and 5 percent; adding 12% of diatomite, 1.2% of silane coupling agent and 2.3% of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
The multilayer heat-insulating environment-friendly film is prepared by the following method:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 150 ℃, adding the first mixture obtained in the step S30, stirring and heating to 170 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
Example 3
Multilayer heat-preservation environment-friendly film and preparation method thereof
The raw materials for preparing the weather-resistant surface layer comprise: 50kg of polyethylene resin, 3.5kg of composite light stabilizer, 0.45kg of antioxidant and 18kg of light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: 60kg of polylactic acid, 100kg of linear low-density polyethylene, 45kg of modified straw fiber, 2.5kg of glass microsphere, 3.5kg of hydroxy cellulose, 8.5kg of chlorinated polyethylene wax, 1.2kg of titanium dioxide and 2.5kg of compatilizer; the raw materials for preparing the inner layer comprise: 50kg of polyvinyl chloride, 15kg of wood fiber, 5kg of zinc stearate, 12kg of montmorillonite, 1.5kg of ethyl silicone oil, 1.4kg of nano silicon dioxide, 1.2kg of zinc stearate and 0.8kg of antioxidant; the composite light stabilizer is UV-50 and the light stabilizer AM-101 in a weight ratio of 10: 30; the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min; the preparation method of the modified straw fiber comprises the following steps: pulverizing plant straw into powder, soaking in 18% sodium hydroxide solution for 2 hrThen drying at the low temperature of 55 ℃ until the water content is between 3 and 5 percent; adding 16% of diatomite, 2.2% of silane coupling agent and 3.5% of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
The multilayer heat-insulating environment-friendly film is prepared by the following method:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 165 ℃, adding the first mixture obtained in the step S30, stirring and heating to 175 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
Example 4
Multilayer heat-preservation environment-friendly film and preparation method thereof
The raw materials for preparing the weather-resistant surface layer comprise: 50kg of polyethylene resin, 2.0kg of composite light stabilizer, 0.4kg of antioxidant and 16kg of light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: 45kg of polylactic acid, 100kg of linear low-density polyethylene, 40kg of modified straw fiber, 1.5kg of glass microsphere, 2.0kg of hydroxy cellulose, 6.5kg of chlorinated polyethylene wax, 0.6 kg-1.2 kg of titanium dioxide and 1.2 kg-2.5 kg of compatilizer; preparation of the inner layerComprises the following raw materials: 50kg of polyvinyl chloride, 10kg to 15kg of wood fiber, 3kg to 5kg of zinc stearate, 6kg to 12kg of montmorillonite, 0.5kg to 1.5kg of ethyl silicone oil, 0.8kg to 1.4kg of nano silicon dioxide, 0.2kg to 1.2kg of zinc stearate and 0.1kg to 0.8kg of antioxidant; the composite light stabilizer is UV-50 and the light stabilizer AM-101 in a weight ratio of 10: 15-30; the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min; the preparation method of the modified straw fiber comprises the following steps: crushing plant straws into powder, soaking the powder in a sodium hydroxide solution with the concentration of 14% for 2.5 hours, and drying the powder at a low temperature of 50 ℃ until the water content is between 3 and 5 percent; adding 15% of diatomite, 1.5% of silane coupling agent and 3.0% of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
The multilayer heat-insulating environment-friendly film is prepared by the following method:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 160 ℃, adding the first mixture obtained in the step S30, stirring and heating to 172 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (9)

1. The multilayer heat-insulating environment-friendly film is characterized in that a weather-resistant surface layer, a heat-insulating layer and an inner layer are sequentially arranged from top to bottom; the raw materials for preparing the weather-resistant surface layer comprise: polyethylene resin, composite light stabilizer, antioxidant and light calcium carbonate; the raw materials for preparing the heat-insulating layer comprise: polylactic acid, linear low-density polyethylene, modified straw fiber, glass beads, hydroxy cellulose, chlorinated polyethylene wax, titanium dioxide and a compatilizer; the raw materials for preparing the inner layer comprise: polyvinyl chloride, an antioxidant, wood fiber, zinc stearate, montmorillonite, ethyl silicone oil, zinc stearate and nano silicon dioxide.
2. The multilayer heat-insulating environment-friendly film as claimed in claim 1, wherein the weatherable surface layer is prepared from the following raw materials in parts by weight: 50 parts of polyethylene resin, 1.5-3.5 parts of composite light stabilizer, 0.2-0.45 part of antioxidant and 10-18 parts of light calcium carbonate.
3. The multilayer heat-insulating environment-friendly film as claimed in claim 1, wherein the heat-insulating layer is prepared from the following raw materials in parts by weight: 40 to 60 parts of polylactic acid, 100 parts of linear low-density polyethylene, 20 to 45 parts of modified straw fiber, 1.2 to 2.5 parts of glass microsphere, 1.5 to 3.5 parts of hydroxy cellulose, 6 to 8.5 parts of chlorinated polyethylene wax, 0.6 to 1.2 parts of titanium dioxide and 1.2 to 2.5 parts of compatilizer.
4. The multilayer heat-insulating environment-friendly film as claimed in claim 1, wherein the raw materials for preparing the inner layer comprise, by weight: 50 parts of polyvinyl chloride, 10-15 parts of wood fiber, 3-5 parts of zinc stearate, 6-12 parts of montmorillonite, 0.5-1.5 parts of ethyl silicone oil, 0.8-1.4 parts of nano silicon dioxide, 0.2-1.2 parts of zinc stearate and 0.1-0.8 part of antioxidant.
5. The multilayer heat-preservation environment-friendly film as claimed in claim 1, wherein the composite light stabilizer is UV-50 and the light stabilizer AM-101 is in a weight ratio of 10: 15-30.
6. The multilayer thermal and environmental protection film of claim 1, wherein the linear low density polyethylene has a density of 0.916g/cm3～0.920g/cm3The melt flow rate is 1.7g/10 min-2.3 g/10 min.
7. The multilayer heat-preservation environment-friendly film as claimed in claim 1, wherein the preparation method of the modified straw fiber comprises the following steps: crushing plant straws into powder, soaking the powder in a sodium hydroxide solution with the concentration of 12-18% for 2-3.5 hours, and drying the powder at a low temperature until the water content is 3-5%; adding 12 to 16 percent of diatomite, 1.2 to 2.2 percent of silane coupling agent and 2.3 to 3.5 percent of hydroxymethyl cellulose, uniformly mixing, granulating and drying to obtain the product.
8. The multilayer heat-insulating environment-friendly film as claimed in claim 7, wherein the temperature of the low-temperature drying is 45-55 ℃.
9. The preparation method of the multilayer heat-preservation environment-friendly film according to any one of claims 1 to 8, characterized by comprising the following steps:
step S10, weighing the raw materials for preparing the multilayer heat-insulating environment-friendly film according to the weight parts;
step S20, adding the composite light stabilizer, the antioxidant and the light calcium carbonate in parts by weight into polyethylene resin, heating and stirring, extruding by a double-screw extruder, and granulating to obtain weather-resistant surface layer particles;
step S30, adding the modified straw fiber, the titanium dioxide and the compatilizer in parts by weight into linear low-density polyethylene, and heating and stirring to obtain a first mixture;
step S40, preheating the polylactic acid to 150-165 ℃, adding the first mixture obtained in the step S30, stirring and heating to 170-175 ℃, adding the glass beads, the hydroxy cellulose and the chlorinated polyethylene wax in parts by weight, uniformly mixing, extruding by a double-screw extruder, and granulating to obtain heat-insulating layer particles;
step S50, mixing the raw materials for preparing the inner layer, extruding the mixture by a double-screw extruder, and granulating to obtain inner layer particles;
and S60, extruding the weather-resistant surface layer particles obtained in the S20, the heat-insulating layer particles obtained in the S40 and the inner layer particles obtained in the S50 by a three-layer co-extrusion casting machine, and cooling and trimming to obtain the multilayer heat-insulating environment-friendly film.
CN202010157315.2A 2020-03-09 2020-03-09 Multilayer heat-preservation environment-friendly film and preparation method thereof Pending CN111253662A (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105198278A (en) * 2015-10-09 2015-12-30 蚌埠市天源气体有限责任公司 Thermal-insulation material for low-temperature pipelines
CN107629351A (en) * 2017-08-28 2018-01-26 肇庆高新区飞越信息科技有限公司 A kind of degradable plastic film and preparation method thereof
CN108178886A (en) * 2017-12-13 2018-06-19 许飞扬 A kind of fire-retardant drop stretch-proof film and preparation method thereof that disappears of agricultural
CN109866489A (en) * 2019-01-14 2019-06-11 诚德科技股份有限公司 A kind of heat-resisting PE plastic film and preparation method thereof

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105198278A (en) * 2015-10-09 2015-12-30 蚌埠市天源气体有限责任公司 Thermal-insulation material for low-temperature pipelines
CN107629351A (en) * 2017-08-28 2018-01-26 肇庆高新区飞越信息科技有限公司 A kind of degradable plastic film and preparation method thereof
CN108178886A (en) * 2017-12-13 2018-06-19 许飞扬 A kind of fire-retardant drop stretch-proof film and preparation method thereof that disappears of agricultural
CN109866489A (en) * 2019-01-14 2019-06-11 诚德科技股份有限公司 A kind of heat-resisting PE plastic film and preparation method thereof

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Application publication date: 20200609