CN110607018B - Soluble film composition, soluble film, preparation method and application thereof - Google Patents
Soluble film composition, soluble film, preparation method and application thereof Download PDFInfo
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- CN110607018B CN110607018B CN201810615498.0A CN201810615498A CN110607018B CN 110607018 B CN110607018 B CN 110607018B CN 201810615498 A CN201810615498 A CN 201810615498A CN 110607018 B CN110607018 B CN 110607018B
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2323/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2323/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2323/04—Homopolymers or copolymers of ethene
- C08J2323/08—Copolymers of ethene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
- C08J2423/00—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers
- C08J2423/02—Characterised by the use of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Derivatives of such polymers not modified by chemical after treatment
- C08J2423/04—Homopolymers or copolymers of ethene
- C08J2423/06—Polyethene
Abstract
The invention provides a soluble film composition, a soluble film, a preparation method and an application thereof. The soluble film composition comprises a polyolefin elastomer and metallocene linear low density polyethylene, wherein the weight content of the polyolefin elastomer is 70-80% and the weight content of the metallocene linear low density polyethylene is 20-30% based on the total weight of the soluble film composition. By applying the technical scheme of the invention, the soluble film formed by adopting the soluble film composition comprising the polyolefin elastomer and the metallocene linear low-density polyethylene has good solubility in the base oil and low processing energy consumption, so that the processing cost is reduced, and the processing process is relatively simple, thereby reducing the manufacturing cost of the soluble film and providing feasibility for reducing the selling price of the soluble film. Meanwhile, due to the structural synergistic effect of the polyolefin elastomer and the metallocene linear low-density polyethylene, the oil solubility and the low-temperature resistance stability of the soluble packaging film prepared from the composition are further improved.
Description
Technical Field
The invention relates to the technical field of organic materials, in particular to a soluble film composition, a soluble film, a preparation method and application thereof.
Background
The ethylene-propylene rubber is synthetic rubber prepared by taking ethylene and propylene as monomers through copolymerization reaction. Ethylene-propylene rubber can be classified into ethylene-propylene-diene rubber and ethylene-propylene-diene rubber according to chemical constitution, wherein ethylene-propylene-diene rubber is copolymerized from ethylene units and propylene units, and ethylene-propylene-diene rubber is copolymerized from ethylene units, propylene units and a small amount of conjugated diene units. Because the ethylene propylene rubber has low density and high filling property, aging resistance, corrosion resistance, steam resistance, hot water resistance, cohesiveness and excellent electrical property and elasticity, the ethylene propylene rubber is widely applied to industries such as automobile industry, building industry, electrical and electronic industry and the like.
During the processing of ethylene-propylene rubber, it is often necessary to transport the finished ethylene-propylene rubber from the manufacturing facility to other manufacturers downstream, and to prevent corrosion or other damage to the ethylene-propylene rubber, a film is often used to coat the ethylene-propylene rubber. The packaging film for packaging the ethylene-propylene rubber comprises an ethylene-vinyl acetate copolymer packaging film, a low-density polyethylene packaging film and a soluble packaging film. Because the prior ethylene propylene rubber packaging film mainly comprises a polyethylene film, a user must peel off the polyethylene packaging film manually or mechanically when using the ethylene propylene rubber, so the operation difficulty of the user is increased, and poor user experience is brought. Therefore, after the soluble packaging film for ethylene propylene rubber is available, the soluble packaging film is widely accepted by users.
The packaging film for ethylene propylene rubber in the prior art is a soluble packaging film, and the main component is a copolymer of ethylene and alpha-olefin. The domestic ethylene propylene rubber (EPM) packaging film adopts a soluble packaging film, and generally requires that the soluble packaging film does not need to be peeled, can be directly dissolved in base oil at a certain temperature, does not precipitate at a low temperature, and omits the process of peeling the packaging film. The domestic literature describes a preparation method of a soluble ethylene propylene rubber packaging film, the raw materials used in the method are a mixture of polyolefin elastomer and traditional linear low-density polyethylene, a HAAKE rheometer is used for film blowing, the dosage of an opening agent oleamide is 0.08-0.1% of the total mass of the raw materials, and the film accounts for 0.8-1.0% of the mass of the ethylene propylene rubber. However, since expensive raw materials are used and the manufacturing process is complicated, the packaging film has disadvantages of high selling price, poor oil solubility, poor low temperature resistance, and the like.
Disclosure of Invention
The invention mainly aims to provide a soluble film composition, a soluble film, a preparation method and an application thereof, and aims to solve the problems of high selling price, poor oil solubility and poor low-temperature resistance of a packaging film in the prior art.
In order to achieve the above object, according to one aspect of the present invention, there is provided a soluble film composition comprising: a polyolefin elastomer, and a metallocene linear low density polyethylene, wherein the weight content of the polyolefin elastomer is 70-80% and the weight content of the metallocene linear low density polyethylene is 20-30% based on the total weight of the dissolvable film composition.
Further, in the above soluble film composition, the metallocene linear low density polyethylene is SP1520 metallocene linear low density polyethylene.
Further, the soluble film composition also comprises an opening agent, wherein the weight content of the opening agent is 0.3-0.5% based on the total weight of the polyolefin elastomer and the metallocene linear low density polyethylene.
Further, in the above soluble film composition, the opening agent is any one of oleamide, erucamide, talc, diatomaceous earth, silica, sodium aluminum silicate and magnesium silicate, or any combination thereof.
According to another aspect of the present invention, there is provided a method for preparing a soluble film, comprising the steps of: s1, mixing the polyolefin elastomer of the soluble film composition and the metallocene linear low-density polyethylene to obtain a mixture; s2, extruding and granulating the mixture to obtain granules; and S3, blowing the granules to obtain the soluble film.
Further, in the above production method, step S2 includes extruding and granulating the mixture in the presence of an opening agent.
Further, in the above production method, in step S2, extrusion and granulation are performed at a temperature of 150 to 160 ℃ by a twin-screw extruder.
Further, in the above production method, the step S3 is performed at a temperature of 150 to 160 ℃.
Further, in the above manufacturing method, before the film blowing, the step S3 further includes: drying the pellets at a temperature of 90 ℃ to 100 ℃.
According to another aspect of the present invention, there is provided a soluble film prepared by any one of the above preparation methods.
According to another aspect of the invention, the ethylene-propylene rubber packaging product comprises ethylene-propylene rubber and a packaging film, wherein the packaging film is the soluble film.
Further, in the above ethylene-propylene rubber package, the ethylene-propylene rubber is any one or a combination of two of ethylene-propylene-diene rubber and ethylene-propylene-diene rubber.
By applying the technical scheme of the invention, the soluble film formed by adopting the soluble film composition comprising the polyolefin elastomer and the metallocene linear low-density polyethylene which are matched in a specific range has good solubility in the base oil and low processing energy consumption, so that the processing cost is reduced, and the processing process is relatively simple, therefore, the manufacturing cost of the soluble film is reduced, and further, the feasibility is provided for reducing the selling price of the soluble film. Meanwhile, due to the proportion and the structural synergistic effect of the polyolefin elastomer and the metallocene linear low-density polyethylene, the oil solubility and the low-temperature resistance stability of the soluble packaging film prepared from the composition are further improved.
Detailed Description
It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict. The present invention will be described in detail with reference to examples.
As can be understood from the foregoing background art, the film of the ethylene propylene rubber used for wrapping in the prior art is made of a mixture of a polyolefin elastomer and a conventional linear low density polyethylene, and thus, it shows problems of poor oil solubility and poor low temperature resistance, and since the conventional linear low density polyethylene is used, the processing cost is high, and it is not favorable for mass production and use. In view of the above-described technical problems, in one exemplary embodiment of the present application, there is provided a dissolvable film composition comprising a polyolefin elastomer and a metallocene linear low density polyethylene, wherein the polyolefin elastomer is present in an amount of 70% to 80% by weight and the metallocene linear low density polyethylene is present in an amount of 20% to 30% by weight, based on the total weight of the dissolvable film composition.
Unlike conventional low density polyethylene used in the prior art, the soluble film composition of the present invention comprises metallocene linear low density polyethylene. Metallocene linear low density polyethylene is linear low density polyethylene polymerized using a metallocene as a catalyst, with a single active site. The metallocene linear low density polyethylene thus formed has a relatively uniform polymerization rate and relatively uniform comonomer content across different polymer molecular chains. Thereby leading the metallocene linear low density polyethylene to have narrower relative molecular weight distribution and uniform intramolecular composition distribution. Conventional low density polyethylenes have a broad relative molecular weight distribution and composition distribution, while the melting point is mainly determined by the high relative molecular weight fraction containing little comonomer. Therefore, when the densities are the same, the melting point of the conventional linear low density polyethylene is higher than that of the metallocene linear low density polyethylene. Therefore, in the process for preparing the soluble film, the metallocene linear low-density polyethylene is used, so that the energy consumption of equipment can be obviously reduced, and the processing cost is further reduced. In addition, because the film prepared by the metallocene linear low-density polyethylene has lower heat sealing temperature at the same time, namely the obtained soluble film can be subjected to heat sealing at relatively lower temperature, the heat sealing energy consumption of the soluble film is also reduced.
The dissolvable film composition of the present invention also comprises a polyolefin elastomer. The polyolefin elastomer is polymerized from ethylene and other olefins (including but not limited to butene, pentene, hexene, heptene, or octene), wherein crystalline regions of the polyethylene block (the resin phase) serve as physical crosslinking points and the introduction of an amount of the other olefin weakens the crystallization of the polyethylene block, thereby forming amorphous regions exhibiting rubber elasticity (the rubber phase). The polyolefin elastomer in the film made from the dissolvable film composition of the present invention can form an interpenetrating network structure where the rubber is the continuous phase, the resin is the dispersed phase or the rubber is the dispersed phase, the resin is the continuous phase, or both are present in the continuous phase. When the polyolefin elastomer and the metallocene linear low density polyethylene form a soluble film together, the metallocene linear low density polyethylene has narrow composition distribution, and the synthesis rates of different molecular chains are relatively close, so that homogeneous nucleation is more prone (compared with heterogeneous nucleation of the traditional linear low density polyethylene), and the polyethylene block part in the polyolefin elastomer is more easily arranged into the homogeneous nucleation of the metallocene linear low density polyethylene. Therefore, when the soluble film composition comprising metallocene linear low density polyethylene and polyolefin elastomer according to the present invention is used, crystallization can be more easily formed, thereby being advantageous in forming a film during a film blowing process. In the case of using the soluble film composition of the present invention, the polymer composition can be rapidly crystallized and formed into a film without using a method of blowing cooling using a blower used in the conventional process after the end of blowing, but directly cooled at ambient temperature.
Meanwhile, due to the addition of the polyolefin elastomer, the melt index of the polymer composition in a viscous flow state at high temperature in the process of forming the film is improved, and the fluidity of the polymer composition is increased. Thus, the soluble film composition does not need to be heated to the higher temperatures of conventional processes during the melting process prior to blowing to achieve the desired flow effect, thereby further reducing processing costs.
On the other hand, controlling the amount of the polyolefin elastomer and the metallocene linear low density polyethylene within the above range allows the polyethylene block portion in the polyolefin elastomer to be more easily arranged in the homogeneous core of the metallocene linear low density polyethylene, so that the low temperature resistance and the oil solubility of the polyolefin elastomer are more fully exerted, and the film formed from the soluble film composition can stably exhibit excellent mechanical strength and low temperature resistance, and the volume price is low due to the low relative density of the polyolefin elastomer, thereby well controlling the manufacturing cost of the product. Thus, the film prepared by the soluble film composition has better low-temperature resistance and oil solubility.
In conclusion, the soluble film formed by the soluble film composition comprising the polyolefin elastomer and the metallocene linear low-density polyethylene has good solubility in the base oil, low processing energy consumption, further reduced processing cost and relatively simple processing technology, so that the manufacturing cost of the soluble film is reduced, and further feasibility is provided for reducing the selling price of the soluble film. Meanwhile, due to the structural synergistic effect of the polyolefin elastomer and the metallocene linear low-density polyethylene, the oil solubility and the low-temperature resistance stability of the soluble packaging film prepared from the composition are further improved.
Specific examples of metallocene linear low density polyethylenes according to some embodiments of the present invention include one or any combination of the metallocene linear low density polyethylenes of mitsui SP1510, SP1520, eksen 1018, 2018, 5400G, 5500G, etc. of dow chemical, and particularly SP1520 with the effect of metallocene linear low density polyethylene being particularly prominent. Specific examples of polyolefin elastomers include Engage7387, 7277, 7467 of dow chemical, ethylene-butene copolymer POE of DF710, DF740 of mitsui corporation; one or any combination of POE (ethylene-octene copolymer) of the dow chemical Engage POE 7086, 8100, 8110, 8150, 8200, 8480, 8806, 8999 and other brands. The above examples of the polyolefin elastomer are merely illustrative, and any substance capable of achieving the technical effects of the present invention may be used.
In another embodiment, the dissolvable film composition further comprises an opening agent. In the process of preparing the film by the soluble film composition, the opening agent can effectively improve the opening performance of the film, can effectively prevent the adhesion between films and the agglomeration between granules, increases the smoothness of the surface of the film, and prevents the deposition of dust on the surface of a product, so that the finished product of the film has a very smooth surface. In some embodiments, the weight content of the opening agent is 0.3% to 0.5%, preferably 0.3% to 0.4%, based on the total weight of the polyolefin elastomer and the metallocene linear low density polyethylene. Within this range, the opening agent is well compatible with the resin and is relatively stable to heat, oxygen, and ultraviolet rays. Thereby providing the film with good performances of bonding resistance, water resistance, moisture resistance, fouling resistance and the like, and can resist static electricity. Therefore, in the case of using the opening agent within the above numerical range, the soluble film composition disclosed in the present invention does not need to add other additives such as an antistatic agent, a stain-proofing agent, etc., thereby reducing the manufacturing cost.
In yet another embodiment, the above-mentioned opening agent is any one of oleamide, erucamide, talc, diatomaceous earth, silica, sodium aluminum silicate and magnesium silicate or any combination thereof, preferably oleamide. In the case of using oleamide as an opening agent, in addition to the above advantages, the film formed from the soluble film composition of the present invention has the effects of significantly reducing the friction coefficient, significantly improving the efficiency in film blowing, effectively preventing the film from being seen in sticking and blocking between pellets, and can further increase the surface smoothness. The above examples of the opening agent are merely illustrative, and any opening agent capable of achieving the technical effects of the present invention may be used.
In another exemplary embodiment of the present application, there is provided a method for preparing a soluble film, the method including the steps of: s1, blending the polyolefin elastomer of any of the dissolvable film compositions previously described with a metallocene linear low density polyethylene to form a blend; s2, extruding and granulating the mixture to obtain granules; and S3, blowing the granules to obtain the soluble film. In the preparation method of the present invention, any one of the above-mentioned soluble film compositions is used, and therefore, the obtained soluble film has good oil solubility and low temperature resistance, and it can be seen that the processing process is relatively simple in the preparation process, thereby achieving the effect of cost saving.
In one embodiment of the above method, the step S2 includes extruding and granulating the mixture in the presence of the opening agent. The existence of the opening agent can effectively improve the opening performance of the film, and can effectively prevent the adhesion between the films in the film blowing process and prevent the agglomeration between granules in the process of adding raw materials into the melt extrusion process. In addition, the opening agent can increase the smoothness of the film surface and prevent dust from being attached to the surface of the product, so that the finished film product is very smooth.
Preferably, in step S2, the extrusion and granulation may be performed at a temperature of 150 to 160 ℃ using a twin-screw extruder. In this case, the raw materials polyolefin elastomer and metallocene linear low density polyethylene are fed from the feed inlet of the extruder into the feed section of the extruder and are completely mixed by the action of the twin screw and the screw thread on the inner wall of the extruder barrel. Because the polyolefin elastomer and the metallocene linear low density polyethylene are used as raw materials, the materials do not need to be heated to the temperature of 160-180 ℃ disclosed in the prior art in the heating section of the double-screw extruder. The polyolefin elastomer and the metallocene linear low-density polyethylene can be melted and achieve the expected viscous flow effect only by relatively low heating temperature, such as 150-160 ℃ or even 150-155 ℃.
After extruding the polymer mixture in a viscous state from the die of the extruder, film blowing was performed by using a film blowing machine. The blowing is preferably carried out at a temperature of 150 ℃ to 160 ℃. According to the method, because the soluble film composition disclosed by the invention is used, the temperature during film blowing is only required to be relatively low between 150 and 160 ℃, even between 150 and 155 ℃, and is not required to be as high as 160 to 180 ℃, so that the energy consumption cost is further reduced.
In addition, in some embodiments, the method further comprises the step of drying the pellets at a temperature of 90 ℃ to 100 ℃ after pelletizing the mixture and before blowing the pellets into a film. Since unnecessary solvent or moisture may be introduced during the extrusion and pelletization, a drying step is preferably performed after the pelletization in order to secure stability of the properties of the resulting packaging film. The drying step may be performed at a temperature of 90 to 100 ℃ for several minutes to several hours, thereby removing the organic solvent or moisture from the pellets. The use of dried pellets to form films by film blowing avoids undesirable degradation and the like before contact with the finished oil.
In another exemplary embodiment of the present application, a dissolvable film is provided, which is prepared using any of the methods of preparation described above. According to the analysis of the above content, the soluble film obtained by the preparation method of the present application has the advantages of good oil solubility, good low temperature resistance and low cost.
In another exemplary embodiment of the present application, there is provided an ethylene-propylene rubber package comprising the ethylene-propylene rubber and a packaging film, wherein the packaging film is the soluble film. In some embodiments, the ethylene-propylene rubber is any one or a combination of ethylene-propylene-diene rubber and ethylene-propylene-diene rubber. Because the ethylene propylene rubber may be corroded or damaged in the transportation process, the soluble film can effectively protect the ethylene propylene rubber. In addition, when in use, because the film has excellent oil solubility, operators do not need to peel off the packaging film, but directly blend the ethylene propylene rubber and the packaging film into the base oil, thereby saving the process steps and the labor cost.
The advantageous effects of the present application will be further described below with reference to examples and comparative examples.
Example 1
POE pellets 3.5kg, having a designation of Engage7387, were mixed with MPE pellets 1.5kg, having a designation of SP1520, to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 100 rpm.
The pellets were then dried at 100 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 160 ℃. A translucent film was finally obtained.
Example 2
3.6kg of POE pellets of grade Engage7387 were mixed with 1.4kg of MPE pellets of grade SP1520 to obtain a mixture. To the mixture was added 20g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 155 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 150 rpm.
The pellets were then blown directly using a film blowing machine operating at 155 ℃. A translucent film was finally obtained.
Example 3
POE pellets 3.7kg, having a designation of Engage7387, were mixed with MPE pellets 1.3kg, having a designation of SP1520, to obtain a mixture. To the mixture was added 25g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 160 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 130 rpm.
The pellets were then dried at 90 ℃ for 1 hour. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 4
POE pellets 3.8kg, having a designation of Engage7387, were mixed with MPE pellets 1.2kg, having a designation of SP1520, to obtain a mixture. To the mixture was added 5g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 155 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 150 rpm.
The pellets were then blown directly using a film blowing machine operating at 150 ℃. A translucent film was finally obtained.
Example 5
POE pellets 3.9kg, having a designation of Engage7387, were mixed with MPE pellets 1.1kg, having a designation of SP1520, to obtain a mixture. To the mixture was added 50g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 160 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 95 ℃ for 4 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 6
4.0kg of POE pellets of grade Engage7387 was mixed with 1.0kg of MPE pellets of grade SP1520 to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 7
3.8kg of POE pellets of grade Engage7277 were mixed with 1.2kg of MPE pellets of grade SP1520 to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 8
3.8kg of POE pellets of grade Engage7467 were mixed with 1.2kg of MPE pellets of grade SP1520 to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 9
3.8kg of POE pellets of DF710 and 1.2kg of MPE pellets of SP1520 were mixed to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Example 10
3.8kg of POE pellets of DF740 and 1.2kg of MPE pellets of SP1520 were mixed to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
Comparative example 1
15g of oleamide was added to 5.0kg of conventional linear low density polyethylene pellets of 7042 manufactured by Jilin petrochemical company, and added to a feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 180 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 100 rpm.
The pellets were then dried at 100 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 170 ℃. A translucent film was finally obtained.
Comparative example 2
15g of oleamide was added to 5.0kg of linear low density polyethylene pellets of the trade name SP1520, and fed into a feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 180 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 100 rpm.
The pellets were then dried at 100 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 170 ℃. A translucent film was finally obtained.
Comparative example 3
POE pellets 3.0kg with the designation Engage7387 were mixed with MPE pellets 2.0kg with the designation SP1520 to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 100 rpm.
The pellets were then dried at 100 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 160 ℃. A translucent film was finally obtained.
Comparative example 4
POE pellets (2.75 kg) having a designation of Engage7387 were mixed with MPE pellets (2.25 kg) having a designation of SP1520 to obtain a mixture. To the mixture was added 5g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 155 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 150 rpm.
The pellets were then blown directly using a film blowing machine operating at 150 ℃. A translucent film was finally obtained.
Comparative example 5
4.5kg of POE pellets of grade Engage7387 were mixed with 0.5kg of MPE pellets of grade SP1520 to obtain a mixture. To the mixture was added 15g of oleamide. The mixture was fed to the feeding section of a twin-screw extruder, and the twin-screw extruder was operated at a temperature of 150 ℃ to extrude and pelletize the mixture, wherein the screw rotation speed of the twin-screw extruder was 120 rpm.
The pellets were then dried at 90 ℃ for 2 hours. And blowing the dried granules by using a film blowing machine, wherein the operating temperature of the film blowing machine is 150 ℃. A translucent film was finally obtained.
The films obtained in the above examples and comparative examples were subjected to the following tests
1. Oil solubility
Firstly, adding a certain amount of 150N into a 500mL or 1L glass three-necked bottle, putting the bottle into an electric heating jacket, heating and stirring, weighing a certain amount of ethylene propylene rubber according to test requirements, and cutting the ethylene propylene rubber into small squares of 5-8 mm for later use; when the base oil temperature reached 80 ℃, the prepared film sample was added to a three-necked flask. After the feeding is finished, the temperature is continuously raised to 120 ℃, the stirring speed is regulated to 130r/min, the stability is controlled until the sample is completely dissolved, the dissolving time is recorded, and the dissolving effect after the sample is cooled to the room temperature is observed. The oil-soluble sample of the packaging film is stored at-20 ℃ and the dissolution effect is observed. See table 1 below for specific test results.
2. Tensile strength
The films prepared in examples 1 to 10 and comparative examples 1 to 2 were respectively used to measure tensile properties of a tensile tester for plastics according to ASTM D638-2003. See table 1 below for specific test results.
TABLE 1
From the above description, it can be seen that the above-described embodiments of the present invention achieve the following technical effects:
as can be seen from the above-mentioned examples, comparative examples and corresponding tests, the soluble film composition disclosed herein has good mechanical properties (tensile properties), room temperature storage property, low temperature storage property, opening property and oil solubility. The soluble film compositions of examples 1 to 10 of the present invention showed similar mechanical properties as compared to comparative examples 1 and 2 comprising only linear low density polyethylene, and the soluble film compositions of the present invention can achieve more excellent effects in room temperature storability, low temperature storability, openability, and oil solubility. In comparative examples 3 to 5, although the composition comprising both the polyolefin elastomer and the metallocene linear low density polyethylene proposed by the present invention was used, the soluble film composition of comparative examples 3 to 5 could not simultaneously achieve good mechanical properties, room temperature storage property, low temperature storage property, openness and oil solubility because the ratio of the two components therein was not appropriate. In comparative examples 3 and 4, since more than 30% of metallocene linear low density polyethylene and less than 70% of polyolefin elastomer were used, acceptable storage stability was not exhibited at both normal and low temperatures. In comparative example 5, since the metallocene linear low density polyethylene was used in an amount of less than 20%, it was inferior in both mechanical strength and oil solubility.
The present invention utilizes a dissolvable film composition comprising a polyolefin elastomer and a metallocene linear low density polyethylene, as opposed to the prior art. The film prepared from the soluble film composition disclosed by the invention has a lower melting point and good crystallization property, so that the cost can be saved in the preparation process. And it can be seen from the above examples and experiments that the polyolefin elastomer and the metallocene linear low density polyethylene in the film are well combined by controlling the amount of the polyolefin elastomer and the metallocene linear low density polyethylene, so that the film has good mechanical strength at low temperature while maintaining good mechanical strength at normal temperature.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by 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 (11)
1. A dissolvable film composition, comprising:
a polyolefin elastomer comprising an ethylene-butene copolymer of dow chemical brand Engage7387, Engage7277, Engage7467 or an ethylene-butene copolymer of mitre company DF710, DF740, and
a metallocene linear low density polyethylene which is a SP1520 metallocene linear low density polyethylene,
wherein the polyolefin elastomer is present in an amount of 70 to 80% by weight and the metallocene linear low density polyethylene is present in an amount of 20 to 30% by weight, based on the total weight of the dissolvable film composition.
2. The dissolvable film composition according to claim 1, further comprising a mouth opening agent, wherein said mouth opening agent is present in an amount of from 0.3% to 0.5% by weight, based on the total weight of said polyolefin elastomer and said metallocene linear low density polyethylene.
3. The soluble film composition according to claim 2, wherein said opening agent is any one or any combination of oleamide, erucamide, talc, diatomaceous earth, silica, sodium aluminum silicate and magnesium silicate.
4. A method of making a dissolvable film, comprising the steps of:
s1, mixing the polyolefin elastomer of the soluble film composition of any one of claims 1 to 3 and the metallocene linear low density polyethylene to obtain a mixture;
s2, extruding and granulating the mixture to obtain granules;
s3, blowing the granules to obtain the soluble film.
5. The method according to claim 4, wherein the step S2 includes extruding and granulating the mixture in the presence of a mouth-opening agent.
6. The method according to claim 4, wherein the extruding and granulating are performed at a temperature of 150 to 160 ℃ by using a twin-screw extruder in step S2.
7. The production method according to claim 4, wherein the step S3 is performed at a temperature of 150 ℃ to 160 ℃.
8. The production method according to claim 4, wherein, before the film blowing, the step S3 further includes: drying the pellets at a temperature of 90 ℃ to 100 ℃.
9. A soluble film produced by the production method according to any one of claims 4 to 8.
10. An ethylene-propylene rubber package comprising ethylene-propylene rubber and a packaging film, wherein the packaging film is the dissolvable film of claim 9.
11. A package as claimed in claim 10, wherein the ethylene propylene rubber is any one or a combination of ethylene propylene rubber and ethylene propylene diene rubber.
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