NL2028036A - Anti-uv anti-fog polyethylene trellis film and its preparation method - Google Patents

Abstract

18 001758P-NL Abstract The present invention discloses a kind of anti-UV anti-fog polyethylene trellis film and its preparation method, whose raw materials include LLDPE resin, LDPE resin, EVA 5 plastic and anti-UV anti-fog agent; put the raw materials into the high-speed mixing mixer in proportion, mix and stir at 300r/min and 60°C for 10min, extrude and granulate at 170°C extrusion temperature, then after extrusion and cast, cooling, trimming and After extrusion, cooling, trimming, pressing and winding, we get the anti-UV anti-fog polyethylene trellis film. The invention obtains anti-UV anti-fogging 10 agent by covalently grafting glyceryl monooleate on rGO/Si02 surface through free radical reaction; better chemical reaction between glyceryl monooleate and active functional groups such as hydroxyl and carboxyl groups on rGO-Si02 surface of hybrid material makes polyglyceryl monooleate not easy to reduce continuously with molecular movement to film surface; through inorganic grafting and grafting 15 association of flow-droplet agent and polymer host linkage By the method of inorganic grafting and grafting of the droplet agent with the polymer host, the speed of droplet agent precipitation is further extended and the amount of precipitation is controlled.

Description

1 001753P-NL ANTI-UV ANTI-FOG POLYETHYLENE TRELLIS FILM AND ITS PREPARATION

METHOD Technical Field The present invention belongs to the field of material technology, and specifically relates to an anti-UV anti-fog polyethylene trellis film and its preparation method. Background Technology Polyethylene (PE) is a thermoplastic resin made by polymerization of ethylene. In industry, it also includes copolymers of ethylene and small amounts of alpha-olefins. Polyethylene is odorless, non-toxic, feels like wax, has excellent low temperature resistance (the lowest use temperature can reach -100 ~ -70 °C), good chemical stability, can resist the erosion of most acids and bases (not resistant to acids with oxidizing properties). Insoluble in general solvents at room temperature, small water absorption, excellent electrical insulation. The surface tension of polyethylene is 3.0x10-2 Newton/m, while the surface tension of water is 7.2x10-2 Newton/m. The difference in surface tension is too great, thus causing ordinary polyethylene trellis film to collect dew drops on the surface. The nature of the anti-fog agent is a surfactant with two functional groups, hydrophilic and lipophilic, with the lipophilic group reaching inside the trellis film and the hydrophilic group facing outside the film. The surface of inorganic nanoparticles possesses special properties, and the extremely strong surface activity makes it easy to bond with the oxygen in the resin, thus achieving the effect of changing the weakly bonded electron cloud and thus improving the bonding force of the molecule; in addition, the compounding of inorganic nanoparticles is also beneficial for improving its dispersion, by obtaining the ideal nanoparticle presence in the polymer and obtaining the smallest possible nanoscale dispersion to The nanoparticles have strong light scattering characteristics, and light scattering is its main optical property. If inorganic nanoparticles with strong reflective effect on UV are selected, after compounding with agricultural film substrates, they will have significant UV blocking effect on the range of UV and will not affect the light transmission of agricultural film, and inorganic nanomaterials have

2 001753P-NL certain crystallization nucleation effect, which can promote the refinement of polymer grains.

Nanosilica is an amorphous white powder. There are unsaturated residual bonds and light groups in different bonding states on the surface. Its molecular state is a three- dimensional chain structure or a three-dimensional network structure, a three- dimensional cassia structure, etc. The permeation effect of nanometer silica is due to its small size effect and macroscopic quantum dangerous path effect, which enables it to penetrate into the material near the unsaturated bond, interact with the electron cloud, and then combine with the material's macromolecules to form a three- dimensional network structure. In addition, the cassia tetrahedron of cassia dioxide is a structure with unsaturated electricity., especially after the particle size reaches the nanometer level, the specific surface area and activity is stronger, and can chemically bond with the polymer matrix, thus achieving the effect of improving and increasing the firmness, strength and stability of the material. The very small particle size allows it to be well dispersed in the material, and also plays a significant role in the scattering of ultraviolet light, with strong ultraviolet absorption, infrared reflection characteristics, and has good compatibility with linear low density polyethylene.

The film anti-fogging agent is generally a non-ionic surfactant, which is composed of two chemical structures: hydrophilic groups and lipophilic groups. Hydrophilic groups such as carboxyl (COOH), hydroxyl (—OH), amine (-NH2-), ether bond (—CH2—CH2—0-), etc., and lipophilic groups are generally long-chain alkyl CnH2n+1 . The strength of the polarity of the hydrophilic group determines the size of the hydrophilicity, and the length of the carbon chain of the lipophilic group determines the compatibility with the resin. Strong hydrophilic and oleophilic base of the long anti-fog agent and resin compatibility, migration rate is slow, lasting anti-fog effect; strong hydrophilic but short oleophilic base of the anti-fog agent migration rate is fast, the initial anti-fog effect is good.

After the anti-fog agent is added to the film with molecular movement gradually migrate to the surface of the shed film, covering the low energy surface of the polyethylene shed film, so that the surface tension of the shed film increases, its hydrophilic end and water affinity, reduce the surface tension of water droplets, so

3 001753P-NL that the water and shed film surface tension is close, so that the water droplets attached to the inner surface of the film spread to form a thin layer of water film, guarding the shed film flow down, to play the role of anti-fog, this is This is the important mechanism of the role of anti-fogging agent. However, the amount of anti- fogging agent will be reduced continuously with the molecular movement to the surface of the film, and it will not be able to play the role of anti-fogging when it reaches a certain time limit. (rGO/SiO2-g-PGMO can be bonded into the LLDPE matrix, which makes it difficult for the anti-fogging agent to precipitate out of the LLDPE matrix (playing a major role) on the one hand, and on the other hand, rGO/SiO2-g-PGMO can prevent the precipitation of the ungrafted anti-fogging agent, making the anti-fogging effect longer.) Content of the Invention In order to remedy the deficiencies in the background technology, the present invention provides an anti-UV anti-fog polyethylene trellis film and its preparation method. To achieve the above purpose, the present invention uses the following technical solution.

An anti-UV anti-fog polyethylene trellis film, comprising the following components in weight parts: LLDPE resin: 100 parts; LDPE resin: 30 parts; EVAnplastic: 30 parts; UV-resistant anti-fogging agent rGO/SiO2-g-PGMO: 5-15 parts; said LLDPE resin is linear low density polyethylene, LLDPE is usually produced by co-polymerization of ethylene and advanced a-olefins such as butene, hexene or octene at lower temperature and pressure. The co-polymerization process produces LLDPE polymers with a narrower molecular weight distribution than typical LDPE and a linear structure giving them different rheological properties. the melt flow properties of LLDPE are adapted to the requirements of new processes, especially with film extrusion processes, which can yield high quality LLDPE products.

4 001753P-NL The said LDPE resin is low density polyethylene, which is usually a polymer obtained by polymerization of ethylene as monomer, under high pressure of 98. 0~294 MPa, with oxygen or organic peroxide as initiator, with density of 0.910~0.9259 g/cm3. low density polyethylene has long and short branched chains on the molecular chain.

Crystallinity is low, molecular weight is generally 5~500,000, it is a creamy white translucent wax-like solid resin, non-toxic. Softening point is low, more than the softening point is molten, its hot fusion, molding and processing performance is very good, good flexibility, impact toughness, low temperature resistance is very good.

Said EVA plastic for ethylene - vinyl acetate copolymer. General vinyl acetate (VA) content of 5%-40%, compared with polyethylene (PE), EVA due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improving the toughness, impact resistance, filler compatibility and heat sealing properties. Ethylene acetate content in 5% to 10% of EVA products for elastic films, etc. EVA is characterized by good flexibility, rubber-like elasticity, still has good flexibility at -50°C, transparency and surface gloss, good chemical stability, anti-aging and ozone strength, non-toxic. Good blendability, colorability and molding processability with fillers.

The said anti-UV anti-fogging agent rGO/SiO2-g-PGMO is prepared by: (1) Preparation of rGO/SiO2: dissolve 2g of CTAB (cetyltrimethylammoniumbromide) in 280ml of deionized water at room temperature, then add 50ml of 1,4-dioxane, 40ml of ethanol and a certain amount of ammonia with magnetic stirring; after 30min, drop 10ml of TEOS (ethyl orthosilicate), a certain amount of graphene oxide ethanol solution into The reaction was stirred for 4h; after 4h hydrochloric acid was added to ph of 7, in stirring for 15min. then the graphene oxide modified nanosilica was washed with ethanol and deionized water and centrifuged to obtain graphene oxide modified nanosilica, the graphene oxide modified nanosilica (GO-Si02) was calcined at 800°C for 4h under the protection of N2 atmosphere to obtain graphene modified nanosilica composite rGO/ SiO2.

(2) rTGO/Si02-g-PGMO: Glycerol monooleate was weighed and added to a three- neck flask and heated at 60 °C in a constant temperature water bath to melt it. After the monooleate was completely melted, mesoporous silica modified by graphene

001753P-NL oxide and initiator BPO were slowly added while stirring. rGO/Si02-g-PGMO was then reacted under N2 protection for 4h to obtain rGO/Si02-g-PGMO, which was washed by filtration with acetone for several times until the upper liquid layer was clear. Finally, the remaining acetone was evaporated off with a rotary evaporator and 5 dried in a vacuum drying oven to obtain purified rGO/Si02-g-PGMO (the mass ratio of SiO2 to monooleic acid glycerides was 1:3). The preparation method of the above anti-UV anti-fog polyethylene trellis film: LLDPE resin, LDPE resin, EVA plastic and anti-UV anti-fog agent are put into the high-speed mixing mixer in proportion, mixed and stirred in the mixer at 300r/min and 60°C for 10min to make a uniform mixture, extruded and granulated at 170°C extrusion temperature; the resulting particles are then extruded and cast, cooled, trimmed and The resulting particles are then extruded and cast, cooled, trimmed, pressed and wound to obtain the anti-UV anti-fog polyethylene cast film product.

Further, the said cast process is direct cast, the cast roll is chrome plated steel roll, the thickness of chrome layer is 0.01~0.015mm, the diameter of steel roll is 500mm, the middle height of steel roll is 0.20-0.25mm; the temperature of steel roll is set at 35~40°C.

Further, said pressurized winding process is pressurized winding on 60-65A liquid silicone rubber rolls with pressurized pressure of 5~8Kgf.

Beneficial effects: (1) The present invention mediates pore silica is inorganic nanoparticles, nanoparticles have strong light scattering characteristics, and light scattering is its main optical properties. After the composite of mesoporous silica and polyethylene agricultural film, it will have a significant blocking effect on the range of ultraviolet light and does not affect the light transmission of agricultural film, and the inorganic nanomaterials have a certain crystallization nucleation effect, which can promote the refinement of polymer grains.

(2) The invention through cetyl trimethyl ammonium bromide on the surface modification of mesoporous silica, the introduction of the ionization of the amino

6 001753P-NL group so that the surface of SiO2 particles with a positive charge; so that the negatively charged GO and positively charged SiO2 particles through the electrostatic effect of composite together to form GO-SiO2 hybrid materials; in addition high temperature calcination on the one hand to remove the preparation of silica when the excess organic cetyl In addition, high-temperature calcination is used to remove the excess organic material cetyl trimethyl ammonium bromide in the preparation of silica on the one hand, and to facilitate grain growth and improve crystallinity on the other hand; secondly, the composite material is prepared by blending rGO-Si02 with PE matrix, which can not only make full use of the mutual barrier effect of rGO and SiO2 particles to inhibit the agglomeration of each other in the matrix, but also give full play to the synergistic enhancement and toughening modification effect of both on PE. The rGO/Si02-g-PGMO is obtained by covalently grafting the monooleate GMO on the surface of reduced graphene oxide modified nanosilica (rGO/Si02) through free radical reaction; the better chemical reaction between monooleate GMO and the active functional groups such as hydroxyl and carboxyl groups on the surface of the hybrid material rGO-SiO2 makes the poly(monooleate PGMO) less susceptible to the molecular movement to the surface of the film is continuously reduced. Further prolonging the precipitation rate and controlling the amount of precipitation by the combination of inorganic grafting and grafting of flow-drop agent with polymer host. Drawings FIG. 1 shows the IR spectrum of the anti-UV antifogging agent rGO/Si02-g-PGMO made in Example 1.

FIG. 2 is an SEM image of the anti-UV anti-fogging agent rGO/Si02-g-PGMO made in Example 1. Specific embodiments In order to make what is described in the present invention easier to understand, the technical solutions described in the present invention are further described below in conjunction with specific embodiments, but the present invention is not limited to this.

7 001753P-NL Example 1 An anti-UV anti-fog polyethylene trellis film comprising the following components in weight: LLDPE resin: 100 parts; LDPE resin: 30 parts; EVA plastic: 30 parts; UV-resistant anti-fogging agent rGO/Si02-g-PGMO: 5 parts; said LLDPE resin is linear low density polyethylene, LLDPE is usually produced by co-polymerization of ethylene and advanced a-olefins such as butene, hexene or octene at lower temperature and pressure. The co-polymerization process produces LLDPE polymers with a narrower molecular weight distribution than typical LDPE and a linear structure giving them different rheological properties. the melt flow properties of LLDPE are adapted to the requirements of new processes, especially with film extrusion processes, which can yield high quality LLDPE products.

The said LDPE resin is low density polyethylene, which is usually a polymer obtained by polymerization of ethylene as monomer, under high pressure of 98. 0~294 MPa, with oxygen or organic peroxide as initiator, with density of 0.910~0.9259 g/cm3. low density polyethylene has long and short branched chains on the molecular chain.

Crystallinity is low, molecular weight is generally 5~500,000, it is a creamy white translucent wax-like solid resin, non-toxic. Softening point is low, more than the softening point is molten, its hot fusion, molding and processing performance is very good, good flexibility, impact toughness, low temperature resistance is very good.

Said EVA plastic for ethylene - vinyl acetate copolymer. General vinyl acetate (VA) content of 5%-40%, compared with polyethylene (PE), EVA due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improving the toughness, impact resistance, filler compatibility and heat sealing properties. Ethylene acetate content in 5% to 10% of EVA products for elastic films, etc. EVA is characterized by good flexibility, rubber-like elasticity, still has good flexibility at -50 °C, transparency and surface gloss, good chemical stability, anti- aging and ozone strength, non-toxic. Good blendability, colorability and molding processability with fillers.

8 001753P-NL The preparation of said anti-UV anti-fogging agent rG0O/Si02-g-PGMO is as follows: Preparation of rGO/SiO2: dissolve 2g of CTAB (cetyltrimethylammonium bromide) in 280ml of deionized water at room temperature, then add 50ml of 1,4-dioxane, 40ml of ethanol and a certain amount of ammonia, and stir magnetically; after 30min, drop 10ml of TEOS (ethyl orthosilicate), a certain amount of graphene oxide ethanol solution into the stirring reaction 4h; after 4h, hydrochloric acid was added to ph of 7, in stirring for 15min. Then the graphene oxide modified nanosilica was washed with ethanol and deionized water and centrifuged to obtain graphene oxide modified nanosilica. rGO/Si02, a graphene oxide modified nanosilica (GO-Si02), was calcined at 800°C for 4h under the protection of N2 atmosphere to obtain graphene modified nanosilica composite rGO/SiO2. rGO/Si02-g-PGMO: Glycerol monooleate was weighed and added to a three-neck flask and heated at 60°C in a constant temperature water bath to melt it. After the monooleate was completely melted, mesoporous silica modified by graphene oxide and initiator BPO were slowly added while stirring. rGO/Si02-g-PGMO was then reacted under N2 protection for 4h to obtain rGO/Si02-g-PGMO, which was washed by filtration with acetone for several times until the upper liquid layer was clear.

Finally, the remaining acetone was evaporated off with a rotary evaporator and dried in a vacuum drying oven to obtain purified rGO/Si02-g-PGMO (the mass ratio of SiO2 to monooleic acid glycerides was 1:3).

Said preparation method: LLDPE resin, LDPE resin, EVA plastic and anti-UV anti- fogging agent were put into the high-speed mixing mixer in proportion, mixed and stirred in the mixer at 300r/min and 60°C for 10min to make a uniform mixture, and extruded and granulated at 170°C extrusion temperature. The resulting particles are then extruded and cast, cooled, trimmed, and pressed and wound to obtain the anti- UV anti-fog polyethylene cast film product.

The said cast process is direct cast, the cast roll is chrome plated steel roll, the thickness of chrome plated layer is 0.01~0.015mm, the diameter of steel roll is 500mm, the middle height of steel roll is 0.20-0.25mm; the temperature of steel roll is set at 35~40°C.

9 001753P-NL The said pressurized winding process is pressurized winding on 60-65A liquid silicone rubber roller, and the pressurized pressure is 5Kgf.

Example 2 An anti-UV anti-fog polyethylene trellis film comprising the following components in weight: LLDPE resin: 100 parts; LDPE resin: 30 parts; EVA plastic: 30 parts; UV-resistant anti-fogging agent rGO/Si02-g-PGMO: 10 parts; said LLDPE resin is linear low density polyethylene, LLDPE is usually produced by co-polymerization of ethylene and advanced a-olefins such as butene, hexene or octene at lower temperature and pressure.

The co-polymerization process produces LLDPE polymers with a narrower molecular weight distribution than typical LDPE and a linear structure giving them different rheological properties. the melt flow properties of LLDPE are adapted to the requirements of new processes, especially with film extrusion processes, which can yield high quality LLDPE products.

The said LDPE resin is low density polyethylene, which is usually a polymer obtained by polymerization of ethylene as monomer, under high pressure of 98. 0~294 MPa, with oxygen or organic peroxide as initiator, with density of 0.910~0.9259 g/cm3. low density polyethylene has long and short branched chains on the molecular chain.

Crystallinity is low, molecular weight is generally 5~500,000, it is a creamy white translucent wax-like solid resin, non-toxic.

Softening point is low, more than the softening point is molten, its hot fusion, molding and processing performance is very good, good flexibility, impact toughness, low temperature resistance is very good.

Said EVA plastic for ethylene - vinyl acetate copolymer.

General vinyl acetate (VA) content of 5%-40%, compared with polyethylene (PE), EVA due to the introduction of vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improving the toughness, impact resistance, filler compatibility and heat sealing properties.

Ethylene acetate content in 5% to 10% of EVA products for elastic films, etc.

EVA is characterized by good flexibility, rubber-like elasticity, still has good flexibility at -50 °C, transparency and surface gloss, good chemical stability, anti-

10 001753P-NL aging and ozone strength, non-toxic. Good blendability, colorability and molding processability with fillers.

The preparation of said anti-UV anti-fogging agent rGO/Si02-g-PGMO is as follows: Preparation of rGO/SiO2: dissolve 2g of CTAB (cetyltrimethylammoniumbromide) in 280ml of deionized water at room temperature, then add 50ml of 1,4-dioxane, 40ml of ethanol and a certain amount of ammonia, and stir magnetically; after 30min, drop 10ml of TEOS (ethyl orthosilicate), a certain amount of graphene oxide ethanol solution into the stirring reaction 4h; after 4h, hydrochloric acid was added to ph of 7, in stirring for 15min. Then the graphene oxide modified nanosilica was washed with ethanol and deionized water and centrifuged to obtain graphene oxide modified nanosilica. rGO/SiO2, a graphene oxide modified nanosilica (GO-Si02), was calcined at 800°C for 4h under the protection of N2 atmosphere to obtain graphene modified nanosilica composite rGO/SiO2. rGO/Si02-g-PGMO: Glycerol monooleate was weighed and added to a three-neck flask and heated at 60°C in a constant temperature water bath to melt it. After the monooleate was completely melted, mesoporous silica modified by graphene oxide and initiator BPO were slowly added while stirring. rGO/Si02-g-PGMO was then reacted under N2 protection for 4h to obtain rGO/Si02-g-PGMO, which was washed by filtration with acetone for several times until the upper liquid layer was clear. Finally, the remaining acetone was evaporated off with a rotary evaporator and dried in a vacuum drying oven to obtain purified rGO/Si02-g-PGMO (the mass ratio of Si02 to monooleic acid glycerides was 1:3). Said preparation method: LLDPE resin, LDPE resin, EVA plastic and anti-UV anti- fogging agent were put into the high-speed mixing mixer in proportion, mixed and stirred in the mixer at 300r/min and 60°C for 10min to make a uniform mixture, and extruded and granulated at 170°C extrusion temperature. The resulting particles are then extruded and cast, cooled, trimmed, and pressed and wound to obtain the anti- UV anti-fog polyethylene cast film product.

11 001753P-NL The said cast process is direct cast, the cast roll is chrome plated steel roll, the thickness of chrome plated layer is 0.01~0.015mm, the diameter of steel roll is 500mm, the middle height of steel roll is 0.20-0.25mm; the temperature of steel roll is set at 35~40°C.

The said pressurized winding process is pressurized winding on 60-65A liquid silicone rubber roller, and the pressurized pressure is 5Kgf. Example 3 A UV-resistant, fog-proof polyethylene trellis film comprising the following components in parts by weight: LLDPE resin: 100 parts; LDPE resin: 30 parts; EVA plastic: 30 parts; UV-resistant anti-fogging agent rGO/Si02-g-PGMOQO: 15 parts; said LLDPE resin is linear low density polyethylene, LLDPE is usually produced by co-polymerization of ethylene and advanced a-olefins such as butene, hexene or octene at lower temperature and pressure. The co-polymerization process produces LLDPE polymers with a narrower molecular weight distribution than typical LDPE and a linear structure giving it different rheological properties. the melt flow properties of LLDPE are adapted to the requirements of new processes, especially with film extrusion processes, which can yield high quality LLDPE products. The said LDPE resin is low density polyethylene, which is usually a polymer obtained by polymerization of ethylene as monomer, under high pressure of 98. 0~294 MPa, with oxygen or organic peroxide as initiator, with density of 0.910-0.9259/cm3. low density polyethylene has long and short branched chains on the molecular chain. Crystallinity is low, molecular weight is generally 5~500,000, it is a creamy white translucent wax-like solid resin, non-toxic. Softening point is low, more than the softening point is molten, its hot fusion, molding and processing performance is very good, good flexibility, impact toughness, low temperature resistance is very good. Said EVA plastic for ethylene - vinyl acetate copolymer. General vinyl acetate (VA) content of 5%-40%, compared with polyethylene (PE), EVA due to the introduction of

12 001753P-NL vinyl acetate monomer in the molecular chain, thereby reducing the high crystallinity, improving the toughness, impact resistance, filler compatibility and heat sealing properties. Ethylene acetate content in 5% to 10% of EVA products for elastic films, etc. EVA is characterized by good flexibility, rubber-like elasticity, still has good flexibility at -50 °C, transparency and surface gloss, good chemical stability, anti- aging and ozone strength, non-toxic. Good blendability, colorability and molding processability with fillers.

The preparation of said anti-UV anti-fogging agent rGO/Si02-g-PGMO is as follows: Preparation of rGO/SiO2: dissolve 2g of CTAB (cetyltrimethylammoniumbromide) in 280ml of deionized water at room temperature, then add 50ml of 1,4-dioxane, 40ml of ethanol and a certain amount of ammonia, and stir magnetically; after 30min, drop 10ml of TEOS (ethyl orthosilicate), a certain amount of graphene oxide ethanol solution into the stirring reaction 4h; after 4h, hydrochloric acid was added to ph of 7, in stirring for 15min. Then the graphene oxide modified nanosilica was washed with ethanol and deionized water and centrifuged to obtain graphene oxide modified nanosilica. rGO/SiO2, a graphene oxide modified nanosilica (GO-Si02), was calcined at 800°C for 4h under the protection of N2 atmosphere to obtain graphene modified nanosilica composite rGO/SIO2. rGO/Si02-g-PGMO: Glycerol monooleate was weighed and added to a three-neck flask and heated at 60°C in a constant temperature water bath to melt it. After the glycerol monooleate was completely melted, mesoporous silica modified by graphene oxide and initiator BPO were slowly added while stirring. rGO/SiO2-g- PGMO was then reacted under N2 protection for 4h to obtain rGO/SiO2-g-PGMO, which was washed by filtration with acetone for several times until the upper liquid layer was clear. Finally, the remaining acetone was evaporated off with a rotary evaporator and dried in a vacuum drying oven to obtain purified rGO/Si02-g-PGMO (the mass ratio of SiO2 to monooleic acid glycerides was 1:3). Said preparation method: LLDPE resin, LDPE resin, EVA plastic and anti-UV anti- fogging agent were put into the high-speed mixing mixer in proportion, mixed and stirred in the mixer at 300r/min and 60°C for 10min to make a uniform mixture, and

13 001753P-NL extruded and granulated at 170°C extrusion temperature. The resulting particles are then extruded and cast, cooled, trimmed, and pressed and wound to obtain the anti- UV anti-fog polyethylene cast film product.

The said cast process is direct cast, the cast roll is chrome plated steel roll, the thickness of chrome plated layer is 0.01-0.015mm, the diameter of steel roll is 500mm, the middle height of steel roll is 0.20~0.25mm; the temperature of steel roll is set at 35~40°C.

The said pressurized winding process is pressurized winding on 60-65A liquid silicone rubber rolls, and the pressurized pressure is 5Kgf. Figure 1 shows the infrared spectrum of rGO/SiO2-g-PGMO, from which the peaks near 1100 cm-1 and 800 cm-1 are the characteristic peaks of SiO2, representing the anti-symmetric stretching vibration peak and symmetric stretching vibration peak of Si-0-Si, respectively. rGO/SiO2 differs from rGO/Si02-g-PGMO in that the peaks at 2916 cm-1 and They are the C-H bond symmetric and asymmetric stretching vibration characteristic peaks, and 1378 cm-1 is the C-H bond bending vibration peak. rGO/SiO2 has been successfully grafted with PGMO.

Figure 2 shows the SEM image of the anti-UV anti-fogging agent rGO/Si02-g-PGMO made in Example 1; its SiO2 is more uniformly dispersed on rGO and PGMO with less agglomeration, which is more conducive to the combination of SiO2 and the matrix resin, and the film has better performance.

Performance analysis: Table 1 shows the results of mechanical properties of the films made according to GB 4455-2006 standard test cases 1-3 and blank samples (blank samples are made of 100 parts of LLDPE, 30 parts of LDPE and 30 parts of EVA without rGO/Si02-g-PGMO anti-UV anti-fogging agent); Table 2 shows the results of anti-fogging holding period and contact angle test.

14 001753P-NL Table 1: Mechanical properties Serial number Materials Direction Tensile | Elongati Right angle strength on tear strength 1 Blank Horizontal 35.63 797.3 120.78 Sample Example 1 38.97 802.3 122.13 Example 2 38.03 808.9 123.76 Example 3 36.95 804.7 122.03 Table 1 shows that the addition of anti-UV anti-fogging agents improved the mechanical properties of the films and did not adversely affect the mechanical properties of the films.

Table 2 Anti-fog holding period and contact angle Category Anti-fogging time at Contact angle 60°C (d) (degree) Plain polyethylene film Polyethylene film with mono-oleic acid 17 56.2 glycerides Simple physical blending of 20 51.5 SiO02+monooleic acid glycerides Example 1 Example 2 Example 3 The data in Table 2 show that the addition of the UV anti-fogging agent rGO/Si02-g- PGMO significantly improved the anti-fogging shelf life of the films, by 5-6 days over the effect of the simple physical blend of SiO2 + mono-oleic acid glycerides and by 18-19 days over that of the ordinary polyethylene films without the anti-fogging agent. The contact angle of the film without UV anti-fogging agent was 87.5 degrees, B was

51.5 degrees for the SiO2 + monooleate simple physical blend film, and the contact angles of Examples 1-3 were 30.3 degrees, 28.1 degrees, and 27.2 degrees, respectively. It can be seen that the addition of rGO/Si02-g-PGMO improves the hydrophilic ability of the film, which decreases the contact angle and greatly improves

15 001753P-NL the anti-fog performance.

The above mentioned is only a better embodiment of the invention, and all the equal changes and modifications made according to the scope of the patent application of the invention shall be covered by the invention.

Claims (8)

16 001758P-EN Conclusions A UV-resistant and fog-resistant polyethylene trellis film characterized by the fact that it consists of the following components in parts by weight of LLDPE resin: 100 parts. LDPE resin: 30 parts. EVA plastic: 30 parts. UV antiglare agent rGO/Si02-g-PGMO: 5-15 parts. 2. The UV-resistant anti-fog polyethylene trellis film according to claim 1, characterized in that said LLDPE resin is linear low-density polyethylene. 3. The UV-resistant anti-fog polyethylene trellis film according to claim 1, characterized in that said LDPE resin is low-density polyethylene. 4. The UV-resistant anti-fog polyethylene trellis sheet according to claim 1, characterized in that: said EVA plastic is an ethylene-vinyl acetate copolymer. The UV resistant antifog polyethylene trellis film according to claim 1, characterized in that said UV resistant antifog agent rGO/SiO 2 -g-PGMO is prepared by. (1) Preparation of rGO/SiO 2 : 2 g of CTAB is dissolved in 280 ml of deionized water at room temperature, then 50 ml of 1,4-dioxane, 40 ml of ethanol and a certain amount of ammonia are added and stirred magnetically; after 30 min, 10 ml of TEOS, a certain amount of graphene oxide ethanol solution is dropped in the stirring reaction for 4 h; after 4 hours, hydrochloric acid is added until pH is 7 then stirred for 15 minutes; then washed with ethanol, deionized water and centrifuged to obtain graphene oxide modified nanosilica, the graphene oxide modified nanosilica was calcined for 4 hours at 800°C under the protection of N2 atmosphere to obtain graphene modified nanosilica composite GO/SiO2. 17 001758P-EN (2) rGO/SiO 2 -g-PGMO: Weighed glycerol monooleate was added to a triplicate flask, heated at 60°C in a constant temperature water bath to melt it, and after the glycerol monooleate had completely melted, the graphene modified nanosilica composite rGO/SIO2 and initiator BPO added slowly with stirring, then the reaction was carried out under N2 protected atmosphere for 4 hours to make rGO/SiO2 -g-PGMO, washed by filtration with acetone several times until the upper liquid layer was transparent , and finally, the residual acetone was evaporated on a rotary evaporator and dried in a vacuum drying oven to obtain purified rGO/SiO 2 -g-PGMO. A method for preparing anti-UV antifog polyethylene trellis film as claimed in any one of claims 1 to 5, characterized in that LLDPE resin, LDPE resin, EVA plastic and anti-UV antifog agent rGO/SiO 2 -g-PGMO are proportionally put in a high-speed mixing machine, mixed and stirred in the mixer at 300 rpm and 60°C for 10 minutes to mix evenly, and then extruded and granulated at 170°C extrusion temperature, and finally the resulting particles are extruded and molded, cooled, trimmed, and pressed and wrapped to obtain the anti-UV anti-fog polyethylene scaffolding film. 7. The anti-UV anti-fog polyethylene shed film according to claim 1, characterized in that: said calendering is direct calendering, the calender roller is chrome plated steel roller, the thickness of the chrome layer is 0.01-0.015mm, the diameter of the steel roller is 500mm, the middle height of the steel roller is 0.20-0.25mm; the temperature of the steel roller is set at 35-40°C. 8. The anti-UV anti-fog polyethylene trellis film according to claim 1, characterized in that: said pressure winding is specific: pressure winding on a 60-65A liquid silicone rubber roll, the pressurized pressure is 5-8Kgf.