CN114316402A - Formula and preparation process of flexible package single-material heat-resistant layer MDO-PE film - Google Patents
Formula and preparation process of flexible package single-material heat-resistant layer MDO-PE film Download PDFInfo
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- CN114316402A CN114316402A CN202111463255.8A CN202111463255A CN114316402A CN 114316402 A CN114316402 A CN 114316402A CN 202111463255 A CN202111463255 A CN 202111463255A CN 114316402 A CN114316402 A CN 114316402A
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Abstract
The invention relates to the technical field of packaging materials, and discloses a formula of a flexible packaging single material heat-resistant layer MDO-PE film, which comprises the following components in part by weight: nucleating agent master batch, A group material and B group material; the weight percentage of the material of group A is 40-60%, the weight percentage of the material of group B is 40-50%, its formulation also includes heat-resisting master batch and weatherproof master batch; the invention also provides a preparation process of the flexible package single material heat-resistant layer MDO-PE film, which comprises the following steps: s1: preparing materials; s2: mixing the raw materials. The invention not only has high crystallinity, so that the PE film has good heat resistance and cold resistance, the transparency of the PE film is improved, but also the film still keeps higher elongation at break after longitudinal stretching, the subsequent bag making requirement is met, the high-speed printing of a heat-resistant layer of a single material and the aesthetic requirement of the appearance of a packaging material are met, and the high-speed printing and packaging material also has excellent rigidity and bag making stiffness requirements.
Description
Technical Field
The invention relates to the technical field of packaging materials, in particular to a formula and a preparation process of a heat-resistant layer MDO-PE film made of a flexible packaging single material.
Background
At present, the packaging material for soft package such as coffee, pet food, shampoo and the like is mainly made of composite materials, mainly composed of different material layers such as PET (PA)/PE and the like, which are inseparable and have different characteristics and melting points, so that the materials are not suitable for recycling, and along with the increasing seeking of realizing recycling economy by recycling plastic package with the highest efficiency in the market, the materials are required to be homogeneous, at present, all parties mainly seek the alternative material of PET (PA), the material firstly belongs to polyethylene, has high heat resistance adaptation, and has high strength and large extension mechanical properties to meet the bag making requirement.
At present, although the MDO film co-extruded multilayer polyethylene film belongs to polyethylene, the film is difficult to meet the requirements of a heat-resistant layer of a single material for flexible packaging on heat resistance, transparency and mechanical properties and cannot meet the bag making requirements of heat sealing, printing and the like of a packaging film, so that a formula and a preparation process of the MDO-PE film of the heat-resistant layer of the single material for flexible packaging are provided.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a formula and a preparation process of a flexible package single-material heat-resistant layer MDO-PE film, and solves the problems that the heat resistance, transparency and mechanical properties of the conventional flexible package film are difficult to meet the requirements of a flexible package single-material heat-resistant layer and cannot meet the bag making processing of people.
(II) technical scheme
In order to achieve the purpose, the invention provides the following technical scheme:
the formula of the flexible package single-material heat-resistant layer MDO-PE film is characterized by comprising the following components in parts by weight: nucleating agent master batch, A group material and B group material; the weight percentage of the material in group A is 40-60%, the weight percentage of the material in group B is 40-50%, and the formula also comprises heat-resistant master batch and weather-resistant master batch.
As a still further aspect of the present invention, the group a material comprises 92-98% of High Density Polyethylene (HDPE), 1-5% of polyolefin plastomer; the B group material comprises 92-98% of High Density Polyethylene (HDPE), 1-10% of polyolefin plastomer and 0.5-3% of anti-blocking master batch.
Further, the high-density polyethylene has a density of 0.950 to 0.965g/cm3Melting point 132-3The melting point is 68-100 ℃, and the elongation at break is 80-1000%.
On the basis of the scheme, the anti-adhesion master batch takes high-density polyethylene as a main body, and the formula further comprises a silicon dioxide and nano glass bead composition.
As a still further aspect of the present invention, the heat-resistant master batch comprises 50-60% of high molecular weight polyethylene, 1-3% of magnesium stearate, 20-30% of high density polyethylene and 3-10% of medium density polyethylene, the high molecular weight polyethylene has a melt flow rate of 0.01-0.07g/10min and a density of 0.949-0.956g/cm3The medium density polyethylene has a melt flow rate of 0.2-0.9g/10min and a density of 0.934-0.948g/cm3。
As a further scheme of the invention, the weather-resistant master batch comprises 80-90% of high-density polyethylene, 221410-15% of antioxidant and 1-5% of polyethylene wax.
The invention also provides a preparation process of the flexible package single material heat-resistant layer MDO-PE film, which comprises the following steps:
s1: proportioning, namely weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch according to a proportion for later use;
s2: mixing raw materials: weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch in corresponding proportion, and stirring and mixing to obtain a mixed material;
s3: extruding, namely adding the mixed materials into corresponding extruders respectively, melting and plasticizing to obtain a melt, extruding the melt through a die head, and cooling and casting a sheet to obtain a sheet;
s4: stretching: preheating the sheet, then sending the sheet into a longitudinal stretching device (MDO) for longitudinal stretching, heating the longitudinally stretched film to a shaping temperature, carrying out shaping treatment on the film, then cooling, then carrying out automatic thickness measurement on the film, and then carrying out surface treatment;
s5: and (4) finishing, namely drawing, cutting edges and coiling the stretched film finished product into a mother roll to obtain the heat-resistant layer MDO-PE film.
As a still further scheme of the invention, the anti-blocking master batch in S1 comprises 0.1-1.2% of metallocene polyethylene resin and 1-3% of anti-blocking filler, and the particle size of the anti-blocking filler is 120-400 nm.
Further, the stirring rotation number is 300-1000rpm/min during stirring in S2, and the stirring is 30-45 min.
On the basis of the scheme, the extruder in the S3 is a single-screw extruder, the length-diameter ratio of a screw is 30-40, the diameter of the screw is 90-150mm, the rotation speed of the screw is 30-50rpm, the temperature of the extruder is 180-260 ℃, the temperature of a die head is 190-210 ℃, the preheating temperature in the S4 and the S5 is 90-126 ℃, the stretching temperature is 110-128 ℃, the setting temperature is 120-130 ℃, the cooling temperature is 35-45 ℃, the number of rollers during stretching is 4, the diameter of each roller is 150-250mm, and the stretching speed is divided into a slow roller and a fast roller.
(III) advantageous effects
Compared with the prior art, the invention provides a formula and a preparation process of a flexible package single-material heat-resistant layer MDO-PE film, and the flexible package single-material heat-resistant layer MDO-PE film has the following beneficial effects:
1. according to the invention, the high-density polyethylene and the polyolefin plastomer are added, the high-density polyethylene is a nonpolar thermoplastic resin with high crystallinity, the high-density polyethylene has good heat resistance and cold resistance and high chemical stability, the transparency of the PE film is improved, the addition of the polyolefin plastomer enables the film to keep higher elongation at break after longitudinal stretching, the subsequent bag making requirements are met, the PE film has excellent optical performance through extrusion and then longitudinal stretching, the high-speed printing of a single material heat-resistant layer and the aesthetic requirements of the appearance of a packaging material are met, and meanwhile, the high-density polyethylene has excellent rigidity and bag making stiffness requirements.
Drawings
FIG. 1 is a schematic flow structure diagram of the process for preparing the flexible packaging single material heat-resistant layer MDO-PE film provided by the invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Example 1
Referring to fig. 1, the formula of the single material heat-resistant layer MDO-PE film for flexible packaging comprises: nucleating agent master batch, A group material and B group material; the nucleating agent is added, so that the number of crystal nuclei for crystallization of the PE film and the melt at the melting point is greatly increased, the crystallization speed is accelerated, the crystallinity of the PE film is improved, the strength of the PE film is ensured, the transparency of the PE film is improved, the glossiness and the brilliance of the film are also increased, the weight percentage of the A group material is 45%, the weight percentage of the B group material is 45%, and the formula further comprises heat-resistant master batch and weather-resistant master batch.
In the invention, the group A material comprises 92 percent of High Density Polyethylene (HDPE) and 2 percent of polyolefin plastomer, the group B material comprises 92 percent of High Density Polyethylene (HDPE), 5 percent of polyolefin plastomer, 0.5 percent of anti-adhesion master batch and 0.950g/cm of high density polyethylene3Melting point 132 ℃, breaking elongation 800%, the polyolefin plastomer is ethylene-alpha olefin copolymer, the alpha olefin is 1-hexene or 1-octene, the density is 0.88/cm3The melting point is 75 ℃, the breaking elongation is 500%, the anti-adhesion master batch takes high density polyethylene as a main body, and the formula also comprises the dioxideA silicon and nano glass bead composition is prepared from heat-resistant mother material including high-molecular polyethylene (50%), magnesium stearate (2%), high-density polyethylene (20%) and medium-density polyethylene (5%), high-molecular polyethylene (0.05 g/10 min) and high-density polyethylene (0.950 g/cm)3The medium density polyethylene has a melt flow rate of 0.5g/10min and a density of 0.942g/cm3The weather-resistant master batch comprises 80% of high-density polyethylene, 221410% of antioxidant and 3% of polyethylene wax.
The invention also provides a preparation process of the flexible package single material heat-resistant layer MDO-PE film, which comprises the following steps:
s1: proportioning, namely weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch according to a proportion for later use;
s2: mixing the raw materials, weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch in corresponding proportion, and stirring and mixing to obtain a mixed material;
s3: extruding, namely adding the mixed materials into corresponding extruders respectively, melting and plasticizing to obtain a melt, extruding the melt through a die head, and cooling and casting a sheet to obtain a sheet;
s4: stretching: preheating the sheet, then sending the sheet into a longitudinal stretching device (MDO) for longitudinal stretching, heating the longitudinally stretched film to a shaping temperature, carrying out shaping treatment on the film, then cooling, then carrying out automatic thickness measurement on the film, and then carrying out surface treatment;
s5: and (4) finishing, namely drawing, cutting edges and coiling the stretched film finished product into a mother roll to obtain the heat-resistant layer MDO-PE film.
The anti-blocking master batch in the S1 comprises 0.1% of metallocene polyethylene resin and 1.5% of anti-blocking filler, wherein the anti-blocking filler has a particle size of 120nm, the stirring speed is 450rpm/min during stirring in the S2, the stirring is performed for 30min, the extruder in the S3 is a single-screw extruder, the length-diameter ratio of the screw is 35, the diameter of the screw is 90mm, the rotating speed of the screw is 30rpm, the temperature of the extruder is 180-260 ℃, the temperature of a die head is 220 ℃, the preheating temperature of S4 and S5 is 90 ℃, the stretching temperature is 110 ℃, the setting temperature is 120 ℃, the cooling temperature is 35 ℃, 4 rollers are used for stretching, the diameter of the rollers is 150mm, and the stretching speed is divided into slow rollers and fast rollers.
Example 2
Referring to fig. 1, the formula of the single material heat-resistant layer MDO-PE film for flexible packaging comprises: nucleating agent master batch, A group material and B group material; the nucleating agent is added, so that the number of crystal nuclei for crystallization of the PE film and the melt at the melting point is greatly increased, the crystallization speed is accelerated, the crystallinity of the PE film is improved, the strength of the PE film is ensured, the transparency of the PE film is improved, the weight percentage of the A group material is 60%, the weight percentage of the B group material is 60%, and the formula further comprises heat-resistant master batch and weather-resistant master batch.
In the invention, the group A material comprises 98 percent of High Density Polyethylene (HDPE) and 5 percent of polyolefin plastomer, the group B material comprises 98 percent of High Density Polyethylene (HDPE), 10 percent of polyolefin plastomer, 3 percent of anti-adhesion master batch and 0.964g/cm of high density polyethylene3Melting point of 135 ℃, elongation at break of 1000 percent, the polyolefin plastomer is ethylene-alpha olefin copolymer, the alpha olefin is 1-hexene or 1-octene, and the density is 0.90/cm3The melting point is 100 ℃, the breaking elongation is 1000%, the anti-adhesion master batch takes high-density polyethylene as a main body, the formula also comprises silicon dioxide and a nano glass bead composition, the heat-resistant master batch comprises 60% of high-molecular-weight polyethylene, 3% of magnesium stearate, 30% of high-density polyethylene and 10% of medium-density polyethylene, the melt flow rate of the high-molecular-weight polyethylene is 0.07g/10min, and the density of the high-molecular-weight polyethylene is 0.956g/cm3The medium density polyethylene has a melt flow rate of 0.9g/10min and a density of 0.948g/cm3The weather-resistant master batch comprises 80% of high-density polyethylene, 221410% of antioxidant and 3% of polyethylene wax.
The invention also provides a preparation process of the flexible package single material heat-resistant layer MDO-PE film, which comprises the following steps:
s1: proportioning, namely weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch according to a proportion for later use;
s2: mixing the raw materials, weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch in corresponding proportion, and stirring and mixing to obtain a mixed material;
s3: extruding, namely adding the mixed materials into corresponding extruders respectively, melting and plasticizing to obtain a melt, extruding the melt through a die head, and cooling and casting a sheet to obtain a sheet;
s4: stretching: preheating the sheet, then sending the sheet into a longitudinal stretching device (MDO) for longitudinal stretching, heating the longitudinally stretched film to a shaping temperature, carrying out shaping treatment on the film, then cooling, then carrying out automatic thickness measurement on the film, and then carrying out surface treatment;
s5: and (4) finishing, namely drawing, cutting edges and coiling the stretched film finished product into a mother roll to obtain the heat-resistant layer MDO-PE film.
The anti-adhesion master batch in the S1 comprises 1.2% of metallocene polyethylene resin and 3% of anti-adhesion filler, wherein the grain size of the anti-adhesion filler is inorganic particles with the particle size of 400nm, the stirring speed is 800rpm/min during stirring in S2, the stirring is 45min, the extruder in S3 is a single-screw extruder, the length-diameter ratio of the screw is 40, the diameter of the screw is 150mm, the rotating speed of the screw is 50rpm, the temperature of the extruder is 190 plus 255 ℃, the temperature of a die head is 225 ℃, the preheating temperature in S4 and S5 is 120 ℃, the stretching temperature is 125 ℃, the setting temperature is 130 ℃, the cooling temperature is 40 ℃, 4 rollers are used during stretching, the diameter of the rollers is 200mm, and the stretching speed is divided into slow rollers and fast rollers.
In the description herein, it is noted that relational terms such as first and second, and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims.
Claims (10)
1. The formula of the flexible package single-material heat-resistant layer MDO-PE film is characterized by comprising the following components in parts by weight: nucleating agent master batch, A group material and B group material; the weight percentage of the material in group A is 40-60%, the weight percentage of the material in group B is 40-50%, and the formula also comprises heat-resistant master batch and weather-resistant master batch.
2. The flexible packaging single material heat resistant layer MDO-PE film formulation according to claim 1, wherein the group A material comprises 92-98% of High Density Polyethylene (HDPE), 1-5% of polyolefin plastomer; the B group material comprises 92-98% of High Density Polyethylene (HDPE), 1-10% of polyolefin plastomer and 0.5-3% of anti-blocking master batch.
3. The flexible package single material heat resistant layer MDO-PE film formulation of claim 1, wherein the high density polyethylene has a density of 0.950-0.965g/cm3Melting point 132-3The melting point is 68-100 ℃, and the elongation at break is 80-1000%.
4. The flexible packaging single material heat resistant layer MDO-PE film formulation according to claim 1, wherein the anti-blocking masterbatch is mainly high density polyethylene, and the formulation further comprises a silica and nano glass bead composition.
5. The formulation of single material heat resistant layer MDO-PE film for flexible package according to claim 1, wherein the heat resistant masterbatch comprises 50-60% of high molecular weight polyethylene, 1-3% of magnesium stearate, 20-30% of high density polyethylene and 3-10% of medium density polyethylene, the high molecular weight polyethylene has a melt flow rate of 0.01-0.07g/10min, density of 0.949-0.956g/cm3The medium density polyethylene has a melt flow rate of 0.2-0.9g/10min and a density of 0.934-0.948g/cm3。
6. The flexible packaging single material heat resistant layer MDO-PE film formulation according to claim 1, wherein the weather resistant masterbatch comprises 80-90% of high density polyethylene, 221410-15% of antioxidant and 1-5% of polyethylene wax.
7. The preparation process of the flexible package single-material heat-resistant layer MDO-PE film is characterized by comprising the following steps of:
s1: proportioning, namely weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch according to a proportion for later use;
s2: mixing raw materials: weighing high-density polyethylene, polyolefin plastomer, anti-adhesion master batch, heat-resistant master batch and weather-resistant master batch in corresponding proportion, and stirring and mixing to obtain a mixed material;
s3: extruding, namely adding the mixed materials into corresponding extruders respectively, melting and plasticizing to obtain a melt, extruding the melt through a die head, and cooling and casting a sheet to obtain a sheet;
s4: stretching: preheating the sheet, then sending the sheet into a longitudinal stretching device (MDO) for longitudinal stretching, heating the longitudinally stretched film to a shaping temperature, carrying out shaping treatment on the film, then cooling, then carrying out automatic thickness measurement on the film, and then carrying out surface treatment;
s5: and (4) finishing, namely drawing, cutting edges and coiling the stretched film finished product into a mother roll to obtain the heat-resistant layer MDO-PE film.
8. The process for preparing MDO-PE film as heat-resistant layer of single material in flexible package as claimed in claim 7, wherein the anti-blocking masterbatch in S1 comprises 0.1-1.2% metallocene polyethylene resin and 1-3% anti-blocking filler, and the particle size of the anti-blocking filler is inorganic particles with particle size of 120-400 nm.
9. The process for preparing MDO-PE film as heat resistant layer of single material for flexible package as claimed in claim 7, wherein the stirring rotation speed in S2 is 300-1000rpm/min, and the stirring time is 30-45 min.
10. The process for preparing the MDO-PE film with the heat-resistant layer made of the single material for the flexible package as claimed in claim 7, wherein the extruder in S3 is a single screw extruder, the length-diameter ratio of the screw is 30-40, the diameter of the screw is 90-150mm, the rotation speed of the screw is 30-50rpm, the temperature of the extruder is 180-.
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