CN108314820B - Stretched film and method for producing same - Google Patents
Stretched film and method for producing same Download PDFInfo
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- CN108314820B CN108314820B CN201810130490.5A CN201810130490A CN108314820B CN 108314820 B CN108314820 B CN 108314820B CN 201810130490 A CN201810130490 A CN 201810130490A CN 108314820 B CN108314820 B CN 108314820B
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Abstract
The invention discloses a stretch film and a preparation method thereof, belonging to the technical field of packaging materials, and the technical scheme is characterized in that the stretch film is composed of the following substances in parts by weight: 15-25 parts of low-density polyethylene, 5-8 parts of polypropylene, 4-9 parts of very-low-density polyethylene, 2-5 parts of high-density polyethylene, 1.1-1.5 parts of toluene diisocyanate, 0.2-0.5 part of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardant, 0.3-0.8 part of plasticizer and 0.6-1.1 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The preparation method of the stretched film comprises the following steps: (1) cleaning the die; (2) adding materials; (3) extruding; (4) casting: (5) and (6) rolling. The tensile film prepared by the invention has higher tensile strength and tear strength.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a stretch film and a preparation method thereof.
Background
The packaging forms of products are various, and the stretched film material is also one of the more common packaging forms. It can form protection on the periphery of the product, and can make the product damp-proof, dust-proof and water-proof. Compared with the traditional paper packaging, the stretched film material has lower cost and very high application value. The material commonly used for stretch film is low density polyethylene, and the stretch film is prepared by casting or film blowing process. The packaging method of the stretch film is simple, is particularly suitable for the logistics industry, has very fast acceleration rate in the current stretch film market, has the annual growth rate of more than 20 percent, and has very wide market.
However, due to the single components of the conventional stretch film material, the stretch film material has low tensile strength and tear resistance, is easy to break when encountering sharp objects, and cannot be applied to packaging products well, so that the preparation of the stretch film with good tensile resistance and tear resistance is required.
Disclosure of Invention
In view of the disadvantages of the prior art, the present invention aims to provide a stretch film having good tensile and tear resistance properties.
In order to achieve the purpose, the invention provides the following technical scheme: a stretch film is composed of the following substances in parts by weight: 15-25 parts of low-density polyethylene, 5-8 parts of polypropylene, 4-9 parts of very-low-density polyethylene, 2-5 parts of high-density polyethylene, 1.1-1.5 parts of toluene diisocyanate, 0.2-0.5 part of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardant, 0.3-0.8 part of plasticizer and 0.6-1.1 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3。
By adopting the technical scheme, the ultra-low density polyethylene, the polypropylene and the high density polyethylene are blended, the tearing strength of the stretching film can be improved, the toughness, the environmental stress cracking resistance and the flexibility of the stretching film are improved, the toluene diisocyanate is added, the impact resistance, the penetration resistance, the heavy object falling resistance and the flexibility of the stretching film can be improved, the modified polyisobutylene is added to serve as the tackifying master batch, the stretching film can have good extensibility and good resilience, and the stretching film can have good mechanical strength.
The invention is further configured to: the modified polyisobutene is prepared by the following method: weighing the components in a mass ratio of 3:1:1: isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane in a ratio of 2:1, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding the triphenylallylsilane into the stirrer to prepare the modified polyisobutene.
By adopting the technical scheme, the polyisobutene is generated by polymerization of isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride and 2-methylpyridine, and the allyl-terminated modified polyisobutene is prepared by using triphenyl allyl silane, so that the activity of the polyisobutene can be improved, and the polyisobutene can conveniently react with other substances.
The invention is further configured to: the composition comprises the following substances in parts by weight: 20 parts of low-density polyethylene, 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene, 3.5 parts of high-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant, 0.55 part of plasticizer and 0.85 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3。
By adopting the technical scheme and the weight portion ratio, the prepared stretch film has good tensile resistance and tear resistance.
The invention is further configured to: the plasticizer is one or more of dioctyl phthalate, dimethyl phthalate and dicyclohexyl phthalate.
Through adopting above-mentioned technical scheme, utilize the plasticizer, can strengthen the pliability of tensile membrane, make tensile membrane when meetting sharp object, have better tensile degree, be difficult for being impaled by sharp object.
The invention is further configured to: the halogen-free flame retardant consists of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1: 2.
By adopting the technical scheme, when the melamine is heated, CO is released2、NH3、N2Gas and H2O, which reduces the concentration of oxygen in the air and combustible gas generated when the high polymer is decomposed by heat, and generates non-combustible gasThe polymer takes away part of the heat, reduces the temperature of the surface of the polymer, and generates N2Can capture free radicals and inhibit chain reaction of high polymer so as to prevent combustion, but the effect of melamine used alone is not good, and the effect is better when the melamine is used in combination with polyamine, pentaerythritol and organic montmorillonite.
In view of the defects in the prior art, another object of the present invention is to provide a method for preparing a stretch film, wherein the prepared stretch film has good tensile resistance and tear resistance, and the method comprises the following steps:
(1) cleaning the die: removing the slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing a filter screen, setting the reaction temperature at 80 ℃, weighing 5-8 parts of polypropylene, 4-9 parts of very-low-density polyethylene and 2-5 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring, and preserving heat at 80 ℃ for 20 minutes;
(2) feeding: raising the reaction temperature to 95 ℃, adding 15-25 parts of low-density polyethylene, 1.1-1.5 parts of toluene diisocyanate, 0.2-0.5 part of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardant, 0.3-0.8 part of plasticizer and 0.6-1.1 part of modified polyisobutylene into the uniformly stirred raw materials in sequence, fully stirring, and preserving heat at 95 ℃ for 2 hours;
(3) extruding: carrying out double-screw high-temperature extrusion on the raw materials in the step (2);
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
By adopting the technical scheme, the die is cleaned firstly, so that the situation that the surface of the stretch film is scratched by molten drop points caused by material retention to influence the product quality can be prevented; firstly, uniformly stirring the low-density polyethylene, the polypropylene, the very-low-density polyethylene and the high-density polyethylene, then adding other ingredients, uniformly stirring again, and uniformly stirring the raw materials by adopting fractional stirring; impurities in the raw materials can be removed by using the filter screen, so that the prepared stretched film has high transparency and flatness and no black material residue; the casting temperature is set to 220 ℃, the uniform outflow of the stretched film can be ensured, the thickness is consistent, and the stretched film with higher quality is prepared.
The invention is further configured to: the mesh number of the filter screen in the step (1) is 100 meshes, and two layers are arranged.
By adopting the technical scheme, impurities in the raw materials can be filtered by using the filter screen with the mesh number of 100, so that the prepared stretch film has good transparency and flatness and high quality.
The invention is further configured to: the diameter of a screw of the double-screw extruder in the step (3) is 55mm, and the length-diameter ratio is 15: 1.
By adopting the technical scheme, the diameter of the screw is 55mm, the length-diameter ratio is 15:1, the length of the screw is 8.25m, and the longer screw has good plasticizing effect.
The invention is further configured to: the high-temperature extrusion in the step (3) is divided into 4 stages, wherein the temperature range of the first stage is 154-166 ℃, the temperature range of the second stage is 174-181 ℃, the temperature range of the third stage is 186-198 ℃, and the temperature range of the fourth stage is 200-210 ℃.
Through adopting above-mentioned technical scheme, extrude in the in-process branch stage of high temperature extrusion, because the surface area of granule is not big, though viscidity dissipation heat is very big, nevertheless receives heat transfer area's restriction, and the energy of actual discrepancy solid particle is limited, makes the temperature become cascaded rising, can make granule surface and granule inside thermally equivalent, can make the raw materials quality of extruding better.
The invention is further configured to: the stirring speed in the step (1) and the step (2) is 900-.
By adopting the technical scheme, the materials can be uniformly stirred at the rotation speed of 900-.
In conclusion, the invention has the following beneficial effects:
(1) according to the invention, the extremely-low-density polyethylene, the polypropylene and the high-density polyethylene are blended to be used as raw materials, so that the tearing strength of the stretch film can be improved, and the toughness, the environmental stress cracking resistance and the flexibility of the stretch film can be improved;
(2) according to the invention, the toluene diisocyanate is added, so that the impact resistance, penetration resistance, heavy object falling resistance and flexibility of the stretched film can be improved;
(3) according to the invention, the modified polyisobutylene is added to be used as the tackifying master batch, so that the stretch film has good extensibility and rebound resilience, and the stretch film has good mechanical strength;
(4) the invention utilizes staged extrusion in the high-temperature extrusion process to ensure that the temperature rises in a step manner, the surface and the inside of the particles can be uniformly heated, and the quality of the extruded raw materials can be better.
Detailed Description
The present invention will be described in further detail with reference to examples.
Example 1: a stretch film is composed of the following substances in parts by weight: 15 parts of low-density polyethylene, 5 parts of polypropylene, 4 parts of very-low-density polyethylene, 2 parts of high-density polyethylene, 1.1 parts of toluene diisocyanate, 0.2 part of polybutadiene, 5 parts of metallocene, 1.2 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.3 part of dioctyl phthalate and 0.6 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The modified polyisobutene is prepared by the following method: weighing the components in a mass ratio of 3:1:1: 2:1 of isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding triphenylallylsilane into the stirrer to prepare modified polyisobutene; the preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing the material slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing two layers of filter screens with 100 meshes, setting the reaction temperature at 80 ℃, weighing 5 parts of polypropylene, 4 parts of very-low-density polyethylene and 2 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring, and preserving heat at 80 ℃ for 20 minutes;
(2) feeding: raising the reaction temperature to 95 ℃, adding 15 parts of low-density polyethylene, 1.1 parts of toluene diisocyanate, 0.2 part of polybutadiene, 5 parts of metallocene, 1.2 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.3 part of dioctyl phthalate and 0.6 part of modified polyisobutylene into the uniformly stirred raw materials in sequence, fully stirring at the stirring speed of 900 revolutions per minute for 50min, and preserving the heat at 95 ℃ for 2 hours;
(3) extruding: carrying out high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154 ℃, the temperature interval of the second stage is 174 ℃, the temperature interval of the third stage is 186 ℃, and the temperature interval of the fourth stage is 200 ℃;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Example 2: a stretch film is composed of the following substances in parts by weight: 20 parts of low-density polyethylene, 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene, 3.5 parts of high-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.55 part of dimethyl phthalate and 0.85 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The modified polyisobutylene is prepared fromThe method comprises the following steps: weighing the components in a mass ratio of 3:1:1: 2:1 of isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding triphenylallylsilane into the stirrer to prepare modified polyisobutene; the preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing two layers of filter screens with 100 meshes, setting the reaction temperature at 80 ℃, weighing 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene and 3.5 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring, wherein the stirring speed is 1050 revolutions per minute, the stirring time is 40min, and keeping the temperature at 80 ℃ for 20 min;
(2) feeding: raising the reaction temperature to 95 ℃, sequentially adding 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.55 part of dimethyl phthalate and 0.85 part of modified polyisobutylene into the uniformly stirred raw materials, fully stirring at a stirring speed of 1050 revolutions per minute for 40min, and preserving heat at 95 ℃ for 2 hours;
(3) extruding: performing high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154-;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Example 3: a stretch film is composed of the following substances in parts by weight: 25 parts of low-density polyethylene and poly8 parts of propylene, 9 parts of very-low-density polyethylene, 5 parts of high-density polyethylene, 1.5 parts of toluene diisocyanate, 0.5 part of polybutadiene, 7.5 parts of metallocene, 1.7 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.8 part of dicyclohexyl phthalate and 1.1 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The modified polyisobutene is prepared by the following method: weighing the components in a mass ratio of 3:1:1: 2:1 of isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding triphenylallylsilane into the stirrer to prepare modified polyisobutene; the preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing the material slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing two layers of filter screens with 100 meshes, setting the reaction temperature at 80 ℃, weighing 8 parts of polypropylene, 9 parts of very-low-density polyethylene and 5 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring at the stirring speed of 1200 revolutions per minute for 30min, and preserving the heat at 80 ℃ for 20 min;
(2) feeding: raising the reaction temperature to 95 ℃, adding 25 parts of low-density polyethylene, 1.5 parts of toluene diisocyanate, 0.5 part of polybutadiene, 7.5 parts of metallocene, 1.7 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.8 part of dicyclohexyl phthalate and 1.1 part of modified polyisobutylene into the uniformly stirred raw materials in sequence, fully stirring at the stirring speed of 1200 revolutions per minute for 30min, and preserving the heat at 95 ℃ for 2 hours;
(3) extruding: performing high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154-;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Comparative example: a stretch film is composed of the following substances in parts by weight: 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.55 part of dimethyl phthalate and 0.85 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The modified polyisobutene is prepared by the following method: weighing the components in a mass ratio of 3:1:1: 2:1 of isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding triphenylallylsilane into the stirrer to prepare modified polyisobutene; the preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing the material residue 3 times by penetrating into the die orifice with a soft cutter for 2-3cm, and replacing two layers of filter screens with 100 meshes;
(2) feeding: raising the reaction temperature to 95 ℃, sequentially adding 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.55 part of dimethyl phthalate and 0.85 part of modified polyisobutylene into the uniformly stirred raw materials, fully stirring at a stirring speed of 1050 revolutions per minute for 40min, and preserving heat at 95 ℃ for 2 hours;
(3) extruding: performing high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154-;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Comparative example 2: a stretch film is composed of the following substances in parts by weight: 20 parts of low-density polyethylene, 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene, 3.5 parts of high-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, and 0.55 part of dimethyl phthalate, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing two layers of filter screens with 100 meshes, setting the reaction temperature at 80 ℃, weighing 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene and 3.5 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring, wherein the stirring speed is 1050 revolutions per minute, the stirring time is 40min, and keeping the temperature at 80 ℃ for 20 min;
(2) feeding: raising the reaction temperature to 95 ℃, sequentially adding 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, 0.55 part of dimethyl phthalate and 0.85 part of polyisobutylene into the uniformly stirred raw materials, fully stirring at a stirring speed of 1050 revolutions per minute for 40min, and preserving heat at 95 ℃ for 2 hours;
(3) extruding: performing high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154-;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Comparative example 3: example 2: a stretch film is composed of the following substances in parts by weight: 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2, and 0.55 part of dimethyl phthalate, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3(ii) a The preparation method of the stretched film comprises the following steps:
(1) cleaning the die: removing the material residue 3 times by penetrating into the die orifice with a soft cutter for 2-3cm, and replacing two layers of filter screens with 100 meshes;
(2) feeding: raising the reaction temperature to 95 ℃, sequentially adding 20 parts of low-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant consisting of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1:2 and 0.55 part of dimethyl phthalate into the uniformly stirred raw materials, fully stirring at 1050 revolutions per minute for 40min, and keeping the temperature at 95 ℃ for 2 hours;
(3) extruding: performing high-temperature extrusion on the raw materials in the step (2) by using a double screw with the diameter of 50mm and the length-diameter ratio of 15:1, wherein the high-temperature extrusion is divided into 4 stages, the temperature interval of the first stage is 154-;
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
Tensile strength and tear strength of the stretched films obtained in examples 1 to 3 and comparative examples 1 to 3 were measured, and the results are shown in table 1:
TABLE 1 examination results of the stretched films obtained in examples 1 to 3 and comparative examples 1 to 3
As can be seen from table 1, the tensile strength and tear strength of the tensile film prepared by adding the blend of the polypropylene portion, the very low density polyethylene portion and the high density polyethylene and the tensile film prepared by adding the modified polyisobutylene are all higher than those of the tensile film prepared by using the conventional low density polyethylene in comparative example 1, while the tensile strength and tear strength of the tensile film prepared by adding only the modified polyisobutylene in comparative example 1 and the tensile film prepared by adding only the blend of the polypropylene portion, the very low density polyethylene and the high density polyethylene in comparative example 2 are improved, but the tensile strength and tear strength are not improved.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A stretched film characterized by: the composition comprises the following substances in parts by weight: 15-25 parts of low-density polyethylene, 5-8 parts of polypropylene, 4-9 parts of very-low-density polyethylene, 2-5 parts of high-density polyethylene, 1.1-1.5 parts of toluene diisocyanate, 0.2-0.5 part of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardant, 0.3-0.8 part of plasticizer and 0.6-1.1 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3The melt index of the high-density polyethylene is 6.3g/10min, and the density is 0.953g/cm3。
2. The stretch film of claim 1, wherein: the modified polyisobutene is prepared by the following method: weighing the components in a mass ratio of 3:1:1: isobutene, 1, 4-bis (2-chloroisopropyl) benzene, vanadium tetrachloride, 2-methylpyridine and triphenylallylsilane in a ratio of 2:1, placing the isobutene, the 1, 4-bis (2-chloroisopropyl) benzene, the vanadium tetrachloride and the 2-methylpyridine in a stirrer, stirring to perform polymerization reaction, and adding the triphenylallylsilane into the stirrer to prepare the modified polyisobutene.
3. The stretched film according to claim 1, characterized in that: the composition comprises the following substances in parts by weight: 20 parts of low-density polyethylene, 6.5 parts of polypropylene, 6.5 parts of very-low-density polyethylene, 3.5 parts of high-density polyethylene, 1.3 parts of toluene diisocyanate, 0.35 part of polybutadiene, 6 parts of metallocene, 1.55 parts of halogen-free flame retardant, 0.55 part of plasticizer and 0.85 part of modified polyisobutylene, wherein the melt index of the low-density polyethylene is 3.5g/10min, and the density is 0.926g/cm3The melt index of the very low density polyethylene is 2g/10min, and the density is 0.891g/cm3High density polyethyleneThe melt index of the olefin is 6.3g/10min, and the density is 0.953g/cm3。
4. The stretched film according to claim 1, characterized in that: the plasticizer is one or more of dioctyl phthalate, dimethyl phthalate and dicyclohexyl phthalate.
5. The stretched film according to claim 1, characterized in that: the halogen-free flame retardant consists of melamine, ammonium polyphosphate, pentaerythritol and organic montmorillonite in a mass ratio of 3:1:1: 2.
6. A method of making a stretched film according to any one of claims 1-5, wherein: the method comprises the following steps:
(1) cleaning the die: removing the slag 3 times by penetrating a soft cutter into a die orifice for 2-3cm, replacing a filter screen, setting the reaction temperature at 80 ℃, weighing 5-8 parts of polypropylene, 4-9 parts of very-low-density polyethylene and 2-5 parts of high-density polyethylene according to the weight ratio, fully and uniformly stirring, and preserving heat at 80 ℃ for 20 minutes;
(2) feeding: raising the reaction temperature to 95 ℃, adding 15-25 parts of low-density polyethylene, 1.1-1.5 parts of toluene diisocyanate, 0.2-0.5 part of polybutadiene, 5-7.5 parts of metallocene, 1.2-1.7 parts of halogen-free flame retardant, 0.3-0.8 part of plasticizer and 0.6-1.1 part of modified polyisobutylene into the uniformly stirred raw materials in sequence, fully stirring, and preserving heat at 95 ℃ for 2 hours;
(3) extruding: carrying out double-screw high-temperature extrusion on the raw materials in the step (2);
(4) casting: casting the extruded raw materials into a film by using a casting machine, wherein the casting temperature from the first zone to the ninth zone is 220 ℃, and obtaining a stretched film after casting;
(5) winding: and (4) wrapping the stretched film by using a winding machine to obtain a finished stretched film.
7. The method of producing a stretched film according to claim 6, characterized in that: the mesh number of the filter screen in the step (1) is 100 meshes, and two layers are arranged.
8. The method of producing a stretched film according to claim 6, characterized in that: the diameter of a screw of the double-screw extruder in the step (3) is 55mm, and the length-diameter ratio is 15: 1.
9. The method of producing a stretched film according to claim 6, characterized in that: the high-temperature extrusion in the step (3) is divided into 4 stages, wherein the temperature range of the first stage is 154-166 ℃, the temperature range of the second stage is 174-181 ℃, the temperature range of the third stage is 186-198 ℃, and the temperature range of the fourth stage is 200-210 ℃.
10. The method of producing a stretched film according to claim 6, characterized in that: the stirring speed in the step (1) and the step (2) is 900-.
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| CN112406238A (en) * | 2020-12-01 | 2021-02-26 | 昆山金盟塑料薄膜有限公司 | Green environment-friendly cold-stretched film and preparation method thereof |
| CN114085449A (en) * | 2021-11-11 | 2022-02-25 | 宁波市鄞州冰雨塑料制品有限公司 | High-tensile winding film and processing technology |
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