CN110343335B - Heat-resistant label film and preparation method thereof - Google Patents
Heat-resistant label film and preparation method thereof Download PDFInfo
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- CN110343335B CN110343335B CN201910665264.1A CN201910665264A CN110343335B CN 110343335 B CN110343335 B CN 110343335B CN 201910665264 A CN201910665264 A CN 201910665264A CN 110343335 B CN110343335 B CN 110343335B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29D—PRODUCING PARTICULAR ARTICLES FROM PLASTICS OR FROM SUBSTANCES IN A PLASTIC STATE
- B29D7/00—Producing flat articles, e.g. films or sheets
- B29D7/01—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
- C08J5/00—Manufacture of articles or shaped materials containing macromolecular substances
- C08J5/18—Manufacture of films or sheets
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F3/00—Labels, tag tickets, or similar identification or indication means; Seals; Postage or like stamps
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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
- C08J2323/10—Homopolymers or copolymers of propene
- C08J2323/12—Polypropene
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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
- C08J2423/10—Homopolymers or copolymers of propene
- C08J2423/14—Copolymers of propene
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/09—Carboxylic acids; Metal salts thereof; Anhydrides thereof
- C08K5/098—Metal salts of carboxylic acids
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- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/49—Phosphorus-containing compounds
- C08K5/51—Phosphorus bound to oxygen
- C08K5/52—Phosphorus bound to oxygen only
- C08K5/521—Esters of phosphoric acids, e.g. of H3PO4
- C08K5/523—Esters of phosphoric acids, e.g. of H3PO4 with hydroxyaryl compounds
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- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Manufacture Of Macromolecular Shaped Articles (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
Abstract
The invention discloses a heat-resistant label film and a preparation method thereof, wherein the heat-resistant label film comprises the following raw materials in percentage by weight: 0.1-1% of nucleating agent, 10-20% of binary copolymer polypropylene, 8-10% of propylene-octene copolymer and the balance of homopolymerized polypropylene. The nucleating agent in the heat-resistant label film disclosed by the invention enables the crystal particles to be finer and more uniform in size, reduces haze caused by scattering, improves gloss and transparency, and can also improve the tensile strength and the elongation at break of the heat-resistant label film. The binary copolymer polypropylene enables the label film to have better heat resistance and not to be subjected to plastic deformation at high temperature. The propylene-octene copolymer improves the yield strength, elongation at break and heat resistance of the label film. And the steel roller and the rubber roller in the embossing roller group ensure that the label film obtains good glossiness, and meanwhile, the damage to the embossing roller group is small in the processing process. The raw materials are fully plasticized by three-stage heating of the single-screw extruder, and the finished product heat-resistant label film has better strength, toughness and heat resistance.
Description
Technical Field
The invention relates to the technical field of label films, in particular to a heat-resistant label film and a preparation method thereof.
Background
The label film is commonly used as a packaging material of various foods and daily necessities, is mainly used as a shrink sleeve, a full-seal label, a bottle cap seal and the like, and has better attaching degree, higher transparency and better visual effect of a package compared with the traditional label material; meanwhile, the paint also has better glossiness and wear resistance, and is widely applied in recent years.
As the packaging material may be used in various temperature environments, for example: the cooking food with the label film attached to the surface is heated by using a tool, the temperature of the cooking food needs to reach 100 ℃ to meet the requirements of the packaging, the existing label film has poor heat resistance, and the packaging material is often deformed, deteriorated, invalid, aged and the like when the existing label film is used at an overhigh temperature, so that the patterns printed on the surface of the packaging film are changed, and the packaging effect of the product is influenced.
Disclosure of Invention
The invention mainly aims to provide a heat-resistant label film, aiming at solving the technical problem that the label film is easy to deform, age and lose efficacy under high temperature when used for outer packaging due to poor heat resistance of the existing label film.
In order to achieve the purpose, the invention provides a heat-resistant label film, which comprises the following raw materials in percentage by weight: 0.1-1% of nucleating agent, 10-20% of binary copolymer polypropylene, 8-10% of propylene-octene copolymer and the balance of homopolymerized polypropylene.
Preferably, the nucleating agent is at least one of dibenzylidene sorbitol and derivatives thereof, aromatic phosphate, substituted benzoate and metal carboxylate.
Preferably, the heat-resistant label film has a thickness of 50 to 90 μm.
The invention also provides a preparation method of the heat-resistant label film, which comprises the following steps:
dust removal: uniformly mixing the raw materials, and then carrying out dust removal treatment on the raw materials by adopting compressed air;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment to the feed end of an extruder, and melting and plasticizing to form a melt;
cooling and shaping: conveying the melt to an embossing roller set, quickly cooling and shaping to form a film;
trimming and corona treatment: guiding the film into an edge trimmer, performing edge trimming treatment on the film, and performing corona treatment on the edge-trimmed film by using a corona machine;
edge curling: and guiding the film subjected to corona treatment into a winding machine, and winding to obtain the heat-resistant label film.
Preferably, the embossing roller group consists of a steel roller and a rubber roller which are arranged in parallel; the cooling temperature of the steel roller is 28-32 ℃, and the cooling temperature of the rubber roller is 18-22 ℃.
Preferably, the extruder is heated in three stages: the temperature of the feeding section is 180-200 ℃; the temperature of a melting section is 200-230 ℃; the temperature of the homogenization section is 240-270 ℃; the die head temperature of the extruder is 250-275 ℃.
Preferably, the steel roller is a mirror surface steel roller, or a frosted steel roller.
Preferably, the power of the corona treatment is 600-1200W, and the production line speed is 25-60 m/min.
Preferably, the dust removal treatment further comprises primary drying of the raw materials, wherein the primary drying temperature is 70-90 ℃, and the primary drying time is 30-120 min.
Compared with the prior art, the technical scheme of the invention has the following beneficial effects:
1. by adding the nucleating agent, the crystal particles in the heat-resistant label film are fine and uniform in size, the label film is microcrystallized, the haze caused by scattering is reduced, the gloss and the transparency are improved, and the number of microcrystals in the label film is increased, so that the nucleating agent of the heat-resistant label film can also improve the tensile strength and the elongation at break of the heat-resistant label film. By adding the binary copolymer polypropylene, the label film has good heat resistance, the creep resistance of the heat-resistant label film at high temperature is good, the plastic deformation is not easy to occur, and the service life of the label film is prolonged. By adding the propylene-octene copolymer, the yield strength and elongation at break of the material can be improved. The heat resistance of the label film can be improved because the homopolymerized polypropylene can generate crystallization under the action of the nucleating agent.
2. Through the arrangement of the steel roller and the rubber roller in the embossing roller set, the damage to the embossing roller set in the processing process is small while the label film obtains good glossiness.
3. The raw materials are fully plasticized by three-stage heating of the single-screw extruder, and the finished product heat-resistant label film has better strength, toughness and heat resistance.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
In addition, technical solutions between the embodiments may be combined with each other, but must be based on the realization of the technical solutions by a person skilled in the art, and when the technical solutions are contradictory to each other or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
The invention provides a heat-resistant label film, which comprises the following raw materials in percentage by weight: 0.1-1% of nucleating agent, 10-20% of binary copolymer polypropylene, 8-10% of propylene-octene copolymer and the balance of homopolymerized polypropylene.
The addition of the nucleating agent can reduce the haze of the heat-resistant label film, so that the gloss and the transparency of the heat-resistant label film are improved, the number of nucleation cores is increased due to the existence of the nucleating agent, the formation of large spherulites is avoided, the crystal particle size in the heat-resistant label film is fine and uniform, the label film is microcrystallized and uniform in crystallization, the haze caused by scattering is reduced, and the tensile strength and the elongation at break of the heat-resistant label film can be improved due to the increase of the number of microcrystals in the label film. Under the condition of less nucleating agent dosage, the heat sealing performance of the label film is improved, and the storage stability is better. When the addition amount of the nucleating agent is 0.1-1%, the friction coefficient of the label film is gradually increased, and the production flow of the heat-resistant label film is smoother.
The binary copolymer polypropylene with the weight percentage of 10-20% can improve the toughness and the strength of the heat-resistant label film, so that the label film has good heat resistance, the maximum working temperature can reach 100 ℃, the creep resistance of the heat-resistant label film is good at a high temperature, plastic deformation is not easy to occur, the service life of the heat-resistant label film is prolonged, and the prepared heat-resistant label film has good transparency.
The propylene-octene copolymer with the weight percentage of 8-10% has certain crystallization capacity, and because the distribution of octene in molecules and among molecules in the copolymer is not completely uniform and a crystallizable propylene sequence exists, conditions are created for producing eutectic of the propylene-octene copolymer, and the yield strength and the elongation at break of the material can be improved. The homopolypropylene can improve the hardness of the heat-resistant label film, the softening point temperature of the homopolypropylene is about 155 ℃, the thermal deformation temperature of the homopolypropylene is 115-135 ℃, and the homopolypropylene can be crystallized under the action of the nucleating agent, so that the higher the crystallization degree is, the better the heat resistance of the label film is, and the heat resistance of the label film can be further improved by adding the homopolypropylene. From the viewpoint of improving the heat resistance to the label film, homo polypropylene > binary copolymer polypropylene > propylene-octene copolymer.
The nucleating agent is at least one of dibenzylidene sorbitol and derivatives thereof, aromatic phosphate, substituted benzoate and carboxylic acid metal salt.
The dibenzylidene sorbitol and the derivatives thereof in the nucleating agent can improve the impact resistance of the heat-resistant label film, have better compatibility with polypropylene, can ensure that polypropylene spherulites become fine and compact, are favorable for the concentrated transmission of stress around polypropylene particles when being impacted by external force, ensure that the stress is dispersed on small-size interfaces, consume more energy, and improve the impact resistance of the heat-resistant label film. In addition, dibenzylidene sorbitol and derivatives thereof are added, alpha crystal nucleus can be formed by induction, and the rigid network structure of the dibenzylidene sorbitol has a self-locking effect, so that the tensile strength and the bending strength of the heat-resistant label film can be improved, and the transparency and the glossiness of the label film can be improved. The aromatic phosphate in the nucleating agent has lower melting point, better dispersibility in raw materials and higher synthesis efficiency, can perfect the crystal structure of polypropylene, reduce the rearrangement of polypropylene chain segments and increase the dimensional stability of the heat-resistant label film under high temperature conditions. The substituted benzoate in the nucleating agent, side chain methyl in the spiral structure of polypropylene is generally arranged on the benzene ring of the nucleating agent, and the main chain is crystallized by interaction with the surface of the benzene ring. The metal carboxylate in the nucleating agent has larger beta-crystal form relative content in homo-polypropylene and binary co-polypropylene, good stability and decomposition temperature of more than 300 ℃, and can also improve the toughness of the heat-resistant label film.
Optionally, the heat-resistant label film has a thickness of 50 to 90 μm. When the thickness of the heat-resistant label film is less than 50 mu m, the tensile strength and the breaking strength of the heat-resistant label film can not meet the requirements; when the thickness of the heat-resistant label film is larger than 90 micrometers, the heat-resistant label film is poor in transparency and more in raw materials used for preparation, so that the label film with the thickness of 50-90 micrometers can ensure heat resistance and strength, and meanwhile, the production cost is relatively low.
The invention also provides a preparation method of the heat-resistant label film, which comprises the following steps:
dust removal: uniformly mixing the raw materials, and then performing dust removal treatment on the raw materials by adopting compressed air;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment into a feed end of an extruder, and melting and plasticizing to form a melt;
cooling and shaping: conveying the melt to an embossing roller set, quickly cooling and shaping to form a film;
trimming and corona treatment: guiding the film into a trimming machine through a traction roller, trimming the film, and performing corona treatment on the trimmed film through a corona machine;
edge curling: and guiding the film subjected to corona treatment into a winding machine through a traction roller, and winding to obtain the heat-resistant label film.
Specifically, the raw materials are weighed according to the mass percentage and are uniformly mixed, and the dust removal treatment in the technical scheme of the invention mainly prevents dust impurities in the raw materials from polluting the raw materials and influencing the transparency of the label film product. Then the raw material is conveyed to a single screw extruder, after the raw material enters the feeding end of the extruder, because the extruder is provided with higher temperature, and simultaneously the screw of the extruder continuously rotates, stirs and extrudes, the raw material is plasticized and melted in the extruder to form melt, the melt is extruded from a die head of the single screw extruder and then flows to a stably rotating embossing roller set, and a gas jet blows compressed air to the surface of the melt, so that the melt is tightly attached to the surface of the embossing roller set and is rapidly cooled and shaped to form a film. And (3) peeling the film from the surface of the embossing roller set, conveying the film to an edge trimmer, performing memorability edge trimming treatment on the film with uneven edges, conveying the film subjected to edge trimming treatment to a corona machine for eliminating static electricity, and conveying the film to a winder to obtain a finished product of the heat-resistant label film.
The high energy particles applied by the corona machine impact the film rapidly under the action of a strong electric field, so that chemical bonds of molecular chains on the surface layer of the film are broken and degraded, and the surface molecules of the film are oxidized and generate polarity and the surface tension is improved along with the generation of ozone in the discharging process. And the label film surface after corona treatment has good printing adaptability and is suitable for various printing inks and printing modes.
Optionally, the embossing roller set consists of a steel roller and a rubber roller which are arranged in parallel; the cooling temperature of the steel roller is 28-32 ℃, and the cooling temperature of the rubber roller is 18-22 ℃. The steel roller has better hardness and brightness, so that the label film can obtain good glossiness when passing through the surface of the steel roller, and the subsequent printing, gold stamping and other processes of the label film are facilitated. Because the thickness of the prepared label film product is within the range of 50-90 mu m, when two steel rollers are adopted to cool and shape the label film, the gap between the steel rollers is too small, the collision between two groups of steel rollers is easily caused due to poor control in the production process, the embossing roller set is damaged, and even the stability of the product is influenced, so the embossing roller set is formed by the steel rollers and the rubber rollers, and the influence generated during collision is relatively reduced. Specifically, the rubber roller is a fine frosted rubber roller with the surface fineness of 800 meshes.
Optionally, the extruder is a three-stage warming: the temperature of the feeding section is 180-200 ℃; the temperature of a melting section is 200-230 ℃; the temperature of the homogenization section is 240-270 ℃; the die head temperature of the extruder is 250-275 ℃. The temperature setting of the feeding section is relatively low, because the label film raw material is easily melted at an early stage due to overhigh temperature, so that the mixing is insufficient, the plasticization is not uniform, and the raw material can be decomposed in the extrusion process to cause slippage and cause pressure fluctuation during extrusion. The temperature of the melting section is relatively higher than that of the feeding section because the label film material needs to be plasticized at the stage, and most of the raw material can be plasticized only when a certain temperature is reached. The temperature in the homogenization section is set to be the highest in the three sections because the raw material is mostly plasticized in the melting section, and a small part of the high molecules, which are not plasticized due to the high plasticizing temperature, enter the homogenization section, but the un-plasticized part of the raw material can cause the quality of the final label film product to be unstable, so the plasticizing temperature in the homogenization section is set to be the highest, and the plasticizing time of the raw material is prolonged to achieve sufficient plasticizing.
The die head of the single-screw extruder is more burnt than the inner specific surface of the extruder, so the temperature is generally slightly higher than or equal to the inner temperature of the extruder at the set temperature, and the flow of the melt in the die head of the single-screw extruder is facilitated, so that the melt is uniformly dispersed and extruded.
Optionally, the steel roll is a mirror surface steel roll, or a frosted steel roll. Therefore, when the mirror surface steel roller, particularly the high-brightness mirror surface steel roller is adopted, the surface of the label film product can be smooth, and the label film product has good gloss and brightness. When the frosted steel roller is adopted, the heat-resistant label film has a matte effect, and different frosted patterns of the steel roller can be used to ensure that the label film has different surface effects.
Optionally, the power of the corona treatment is 600-1200W, and the production line speed is 25-60 m/min. Because of the different thicknesses of the heat-resistant label films, when the thickness of the prepared label film is thicker, the power of corona treatment and the production line speed are both larger, and vice versa.
Further, the dust removal treatment further comprises primary drying of the raw materials, wherein the primary drying temperature is 70-90 ℃, and the primary drying time is 30-120 min. If moisture in the raw materials is more, the mixture can be unevenly formed to form lumps, a discharge hole of the single-screw extruder is blocked in the extrusion plasticizing stage, feeding is not smooth, fluctuation of extrusion pressure and die head pressure is caused, thickness is uneven, the raw materials need to be dried once, and the situation that the lumps are formed due to excessive moisture is avoided.
The technical solutions of the present invention are further described in detail with reference to specific examples, which should be understood that the following examples are only illustrative and not limiting.
Example 1
Dust removal: weighing 79% of homopolymerized polypropylene, 12.8% of binary copolymerized polypropylene, 8% of propylene-octene copolymer and 0.2% of metal carboxylate nucleating agent, uniformly mixing the raw materials, then carrying out dust removal treatment on the raw materials by using compressed air, and carrying out primary drying on the raw materials subjected to dust removal treatment, wherein the drying temperature is 75 ℃, and the drying time is 80 min;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment to the feed end of a single-screw extruder, wherein the temperature of a feed section of the single-screw extruder is 200 ℃, the temperature of a melting section of the single-screw extruder is 225 ℃, the temperature of a homogenization section of the single-screw extruder is 250 ℃, the temperature of a die head of the single-screw extruder is 255 ℃, and melting and plasticizing the raw materials to form a melt;
cooling and shaping: conveying the melt to an embossing roller set consisting of a mirror steel roller and a rubber roller which are arranged in parallel, wherein the cooling temperature of the mirror steel roller is 29 ℃, the cooling temperature of the rubber roller is 20 ℃, and the melt is rapidly cooled and shaped to form a film;
trimming and corona treatment: guiding the film into a trimming machine through a traction roller, performing trimming treatment on the film, and performing corona treatment on the trimmed film through a corona machine, wherein the power of the corona treatment is 900W, and the production line speed is 50 m/min;
edge curling: and guiding the film subjected to corona treatment into a winding machine through a traction roller, and winding to obtain the heat-resistant label film.
Example 2
Dust removal: weighing 70% of homo-polypropylene, 19.9% of binary copolymer polypropylene, 10% of propylene-octene copolymer and 0.1% of aryl phosphate nucleating agent, uniformly mixing the raw materials, then performing dust removal treatment on the raw materials by using compressed air, and performing primary drying on the raw materials subjected to dust removal treatment, wherein the drying temperature is 82 ℃ and the drying time is 90 min;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment into the feed end of a single-screw extruder, wherein the temperature of a feed section of the single-screw extruder is 190 ℃, the temperature of a melting section of the single-screw extruder is 210 ℃, the temperature of a homogenizing section of the single-screw extruder is 240 ℃, the temperature of a die head of the single-screw extruder is 250 ℃, and the raw materials are melted and plasticized to form a melt;
cooling and shaping: conveying the melt to an embossing roller set consisting of a frosted steel roller and a rubber roller which are arranged in parallel, wherein the cooling temperature of the mirror steel roller is 28 ℃, the cooling temperature of the rubber roller is 22 ℃, and rapidly cooling and shaping are carried out to form a film;
trimming and corona treatment: guiding the film into a trimming machine through a traction roller, trimming the film, and performing corona treatment on the trimmed film through a corona machine, wherein the power of the corona treatment is 780W, and the production line speed is 40 m/min;
edge curling: and guiding the film subjected to corona treatment into a winding machine through a traction roller, and winding to obtain the heat-resistant label film.
To better illustrate the beneficial effects of the embodiments of the present invention, the present invention sets up a set of comparative experiments: thickness 70 μm, normal untreated label film. Examples 1-2 and comparative examples were subjected to performance testing, and the results are given in the following table (where MD means machine direction and TD means transverse direction):
table 1 heat resistant label film performance test results
As can be seen from the test results of table 1, the heat-resistant label film of the present invention has a small heat shrinkage rate and excellent heat resistance after being left in hot air at 100 ℃ for 5min, and its mechanical strength is also significantly improved as compared to the comparative example. By adopting the raw material formula and the preparation method thereof, the added nucleating agent can ensure that the crystal particles in the heat-resistant label film have finer and more uniform sizes, and the haze caused by scattering is reduced. Due to the addition of the binary copolymer polypropylene, the label film has good heat resistance, and the heat-resistant label film has good creep resistance at high temperature and is not easy to generate plastic deformation. The addition of the propylene-octene copolymer can improve the yield strength and elongation at break of the heat-resistant label film. The heat resistance of the label film can be further improved because the homopolymerized polypropylene can generate crystallization under the action of the nucleating agent.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the present specification and directly/indirectly applied to other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (8)
1. The heat-resistant label film is characterized in that the raw materials comprise the following components in percentage by weight: 0.1-1% of nucleating agent, 10-20% of binary copolymer polypropylene and 8-10% of propylene-octene copolymer, and the balance of homopolymerized polypropylene;
the preparation method of the heat-resistant label film comprises the following steps:
dust removal: uniformly mixing the raw materials, and then carrying out dust removal treatment on the raw materials by adopting compressed air;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment to the feed end of an extruder, and melting and plasticizing to form a melt;
the extruder is heated in a three-section mode: the temperature of the feeding section is 180-200 ℃, the temperature of the melting section is 200-230 ℃, and the temperature of the homogenizing section is 240-270 ℃;
cooling and shaping: conveying the melt to an embossing roller set, quickly cooling and shaping to form a film;
the embossing roller set consists of a steel roller and a rubber roller which are arranged in parallel, the cooling temperature of the steel roller is 28-32 ℃, and the cooling temperature of the rubber roller is 18-22 ℃;
trimming and corona treatment: guiding the film into an edge trimmer, performing edge trimming treatment on the film, and performing corona treatment on the edge-trimmed film by using a corona machine;
edge curling: and guiding the film subjected to corona treatment into a winding machine, and winding to obtain the heat-resistant label film.
2. The heat resistant label film according to claim 1, characterized in that: the nucleating agent is at least one of dibenzylidene sorbitol and derivatives thereof, aromatic phosphate, substituted benzoate and carboxylate metal salt.
3. The heat resistant label film according to claim 1, characterized in that: the thickness of the heat-resistant label film is 50-90 mu m.
4. A method of making a heat resistant label film according to any of claims 1-3, comprising the steps of:
dust removal: uniformly mixing the raw materials, and then carrying out dust removal treatment on the raw materials by adopting compressed air;
extruding and plasticizing: adding the raw materials subjected to dust removal treatment into a feed end of an extruder, and melting and plasticizing to form a melt;
the extruder is heated in a three-stage mode: the temperature of the feeding section is 180-200 ℃, the temperature of the melting section is 200-230 ℃, and the temperature of the homogenizing section is 240-270 ℃;
cooling and shaping: conveying the melt to an embossing roller set, quickly cooling and shaping to form a film;
the embossing roller set consists of a steel roller and a rubber roller which are arranged in parallel, wherein the cooling temperature of the steel roller is 28-32 ℃, and the cooling temperature of the rubber roller is 18-22 ℃;
trimming and corona treatment: guiding the film into a trimming machine, trimming the film, and performing corona treatment on the trimmed film by a corona machine;
edge curling: and guiding the film subjected to corona treatment into a winding machine, and winding to obtain the heat-resistant label film.
5. The method of producing a heat-resistant label film according to claim 4, characterized in that: the die head temperature of the extruder is 250-275 ℃.
6. The method of making a heat resistant label film according to claim 4, characterized in that: the steel roller is a mirror surface steel roller or a frosted steel roller.
7. The method of making a heat resistant label film according to claim 4, characterized in that: the power of the corona treatment is 600-1200W, and the production line speed is 25-60 m/min.
8. The method of making a heat resistant label film according to claim 4, characterized in that: the dust removal treatment further comprises primary drying of the raw materials, wherein the primary drying temperature is 70-90 ℃, and the primary drying time is 30-120 min.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910665264.1A CN110343335B (en) | 2019-07-22 | 2019-07-22 | Heat-resistant label film and preparation method thereof |
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| CN201910665264.1A CN110343335B (en) | 2019-07-22 | 2019-07-22 | Heat-resistant label film and preparation method thereof |
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