阅读说明：本技术 Pe真空镀铝复合膜及其制备方法 (PE vacuum aluminized composite film and preparation method thereof ) 是由 李俊强 于 2019-10-31 设计创作，主要内容包括：本发明属于包装材料技术领域,尤其涉及一种PE真空镀铝复合膜及其制备方法。本发明,包括PE复合基膜和连接在PE复合基膜一侧的镀铝膜,所述PE复合基膜包括低密度聚乙烯、茂金属聚乙烯、表面粘合性树脂、线性聚乙烯、抗氧剂、热稳定剂、紫外线阻隔剂和抗粘连剂。本发明提供的PE复合基膜中添加有表面粘合性树脂,大大提高了PE复合基膜对镀铝膜的粘附力,防止发生镀铝膜脱落的问题,并且,本发明提供的PE复合基膜中添加有抗粘连剂,使得制得的包装袋不容易发生粘连,开口性较好。(The invention belongs to the technical field of packaging materials, and particularly relates to a PE vacuum aluminized composite film and a preparation method thereof. The invention comprises a PE composite base film and an aluminizer connected to one side of the PE composite base film, wherein the PE composite base film comprises low-density polyethylene, metallocene polyethylene, surface adhesive resin, linear polyethylene, an antioxidant, a heat stabilizer, an ultraviolet blocking agent and an anti-blocking agent. The surface adhesive resin is added into the PE composite base film, so that the adhesion force of the PE composite base film to an aluminizer is greatly improved, and the problem of shedding of the aluminizer is solved.)

1. The utility model provides a PE vacuum aluminizing composite film, includes compound base film of PE (1) and connects aluminizer (2) in compound base film of PE (1) one side, its characterized in that: the PE composite base film (1) comprises low-density polyethylene, metallocene polyethylene, surface adhesive resin, linear polyethylene, an antioxidant, a heat stabilizer, an ultraviolet blocking agent and an anti-blocking agent.

2. The PE vacuum aluminized composite film according to claim 1, wherein: the PE composite base film (1) comprises, by mass, 30-40 parts of low-density polyethylene, 30-40 parts of metallocene polyethylene, 3-5 parts of surface adhesive resin, 10-15 parts of linear polyethylene, 1-3 parts of antioxidant, 1-3 parts of heat stabilizer, 1-3 parts of ultraviolet blocking agent and 1-3 parts of anti-blocking agent.

3. The PE vacuum aluminized composite film according to claim 2, wherein: the PE composite base film (1) comprises, by mass, 35 parts of low-density polyethylene, 35 parts of metallocene polyethylene, 4 parts of surface adhesive resin, 12 parts of linear polyethylene, 2 parts of antioxidant, 2 parts of heat stabilizer, 2 parts of ultraviolet blocking agent and 2 parts of anti-blocking agent.

4. The PE vacuum aluminized composite film according to claim 1, wherein: the surface adhesive resin comprises polyethylene glycol adipate and a silane coupling agent, wherein the mass ratio of the polyethylene glycol adipate to the silane coupling agent is 1: 0.1-0.3.

5. The PE vacuum aluminized composite film according to claim 1, wherein: the anti-blocking agent is prepared by the following steps:

step A: adding oleic acid and benzylamine into a reaction kettle, taking DMSO as a solvent, and stirring until a reaction solution is homogeneous, wherein the mass ratio of the oleic acid to the benzylamine is 1.1-1.3: 1;

and B: heating under the condition of stirring to raise the temperature of the reaction liquid to 120-130 ℃, and reacting for 4-6h after the preset temperature is reached;

and C: after the reaction is finished, the mixture is naturally cooled to room temperature under the stirring condition, and the anti-blocking agent in a solid state is obtained after the post-treatment step.

6. The PE vacuum aluminized composite film according to claim 5, wherein: the post-treatment step in step C comprises the steps of:

step D: adding the reaction solution into water under the condition of stirring, wherein the volume of the water is more than 10 times of that of the reaction solution;

step E: standing, removing water layer, washing organic layer with water twice, adding ethanol, and heating to below 50 deg.C;

step F: and (4) carrying out suction filtration, and washing the obtained solid with ethanol twice to obtain the solid anti-blocking agent.

7. The PE vacuum aluminized composite film according to claim 1, wherein: the melt flow rate of the low-density polyethylene is 0.2-0.3g/10min, and the density is 0.900-0.920g/cm³。

8. The PE vacuum aluminized composite film according to claim 1, wherein: the melt flow rate of the metallocene polyethylene is 1.0-1.3g/10min, and the density is 0.920-0.940g/cm³。

9. The PE vacuum aluminized composite film according to claim 1, wherein: the antioxidant is PS-802 antioxidant or antioxidant 1010.

10. A preparation method of a PE vacuum aluminized composite film is characterized by comprising the following steps:

the method comprises the following steps: weighing low-density polyethylene, metallocene polyethylene, surface adhesive resin, linear polyethylene, an antioxidant, a heat stabilizer, an ultraviolet blocking agent and an anti-blocking agent in corresponding parts by mass, adding the weighed materials into a three-section co-extrusion type extruder, heating to 185 ℃ at the temperature of 170-;

step two: raising the temperature of the three-layer co-extrusion die to 200-220 ℃, reducing the pressure to below 300Pa, reacting for 1-3min under the condition to obtain a polymer melt, and then sequentially extruding, blowing, cooling, corona and trimming the prepared polymer melt to obtain a PE sheet film;

step three: melting the PE film prepared in the step two, sequentially extruding, molding by a die head, rolling and spreading by a main roller, stretching at 160 ℃ in two directions by 120 plus materials, cooling and shaping, measuring the thickness, rolling, slitting, packaging and printing to obtain a PE composite base film (1);

step four: and (3) placing the PE composite base film (1) prepared in the third step into a vacuum aluminum plating machine for vacuum aluminum plating, and forming an aluminum plating film (2) on one side of the PE composite base film (1).

Technical Field

The invention belongs to the technical field of packaging materials, and particularly relates to a PE vacuum aluminized composite film and a preparation method thereof.

Background

Along with the sustainable development of economy in China, the demand of the packaging industry on the PE barrier composite film is increasing day by day, the application range is also expanding continuously, because the PE has poor oxygen and water vapor barrier capability and the aluminum foil has excellent oxygen and water vapor barrier capability, but the combination of the two can only be carried out, the cutting performance of the aluminum foil is poor, the cost is high, the popularization and the application are not very facilitated, the PE vacuum aluminized composite film not only has very good oxygen and water vapor barrier capability, but also has good use performance and lower cost, other mechanical properties, novel appearance and the like have good comprehensive properties, are easy to popularize and use in large scale, and the aluminum content is less, which better meets the environmental protection requirement and sustainable development, meets the requirement of a common filling machine, and the packaging efficiency is high on an automatic filling line, the comprehensive packaging cost is reduced, and the traditional Baili packaging and paper-plastic composite packaging are gradually replaced to become the first choice for packaging the bagged milk and the beverage. The aluminum plating film using PE material as the base body in the prior art has the problems of poor adhesion of the aluminum plating layer and easy shedding of the aluminum plating layer.

For example, the chinese invention patent application discloses a high gloss aluminized polyethylene label film and a method of producing the same [ application No.: 201810617286.6], the patent application includes polyethylene film and aluminum plating; the polyethylene film layer consists of a corona layer, a middle layer and a printing layer, wherein the thickness of the corona layer is 14-25 mu m, the thickness of the middle layer is 35-44 mu m, and the thickness of the printing layer is 14-25 mu m; the corona layer comprises metallocene linear medium density polyethylene and linear low density polyethylene in a mass ratio of (38-50): (50-62), the middle layer comprises metallocene linear medium density polyethylene and low density polyethylene in a mass ratio of (40-55): (45-60), and the printing layer comprises metallocene linear medium density polyethylene and low density polyethylene in a mass ratio of (38-50): (50-62).

The polyethylene aluminized film provided by the invention has the advantages of extremely high glossiness, good metal texture and excellent physical and mechanical properties, but the problems are not solved yet.

Disclosure of Invention

The invention aims to solve the problems and provides a PE vacuum aluminized composite film.

The invention also aims to provide a preparation method of the PE vacuum aluminized composite film.

In order to achieve the purpose, the invention adopts the following technical scheme:

a PE vacuum aluminizing composite film comprises a PE composite base film and an aluminizer connected to one side of the PE composite base film, wherein the PE composite base film comprises low-density polyethylene, metallocene polyethylene, surface adhesive resin, linear polyethylene, an antioxidant, a heat stabilizer, an ultraviolet blocking agent and an anti-blocking agent.

In the PE vacuum aluminizing composite film, the PE composite base film comprises, by mass, 30-40 parts of low-density polyethylene, 30-40 parts of metallocene polyethylene, 3-5 parts of surface adhesive resin, 10-15 parts of linear polyethylene, 1-3 parts of antioxidant, 1-3 parts of heat stabilizer, 1-3 parts of ultraviolet blocking agent and 1-3 parts of anti-blocking agent.

In the above PE vacuum aluminum-plated composite film, the PE composite base film includes, by mass, 35 parts of low-density polyethylene, 35 parts of metallocene polyethylene, 4 parts of surface adhesive resin, 12 parts of linear polyethylene, 2 parts of antioxidant, 2 parts of heat stabilizer, 2 parts of ultraviolet blocking agent, and 2 parts of anti-blocking agent, respectively.

In the PE vacuum aluminizing composite film, the surface adhesive resin comprises polyethylene glycol adipate and a silane coupling agent, and the mass ratio of the polyethylene glycol adipate to the silane coupling agent is 1: 0.1-0.3.

In the above PE vacuum aluminized composite film, the anti-blocking agent is prepared by the following steps:

step A: adding oleic acid and benzylamine into a reaction kettle, taking DMSO as a solvent, and stirring until a reaction solution is homogeneous, wherein the mass ratio of the oleic acid to the benzylamine is 1.1-1.3: 1;

and B: heating under the condition of stirring to raise the temperature of the reaction liquid to 120-130 ℃, and reacting for 4-6h after the preset temperature is reached;

and C: after the reaction is finished, the mixture is naturally cooled to room temperature under the stirring condition, and the anti-blocking agent in a solid state is obtained after the post-treatment step.

In the above PE vacuum aluminized composite film, the post-treatment step in step C includes the steps of:

step D: adding the reaction solution into water under the condition of stirring, wherein the volume of the water is more than 10 times of that of the reaction solution;

step E: standing, removing water layer, washing organic layer with water twice, adding ethanol, and heating to below 50 deg.C;

step F: and (4) carrying out suction filtration, and washing the obtained solid with ethanol twice to obtain the solid anti-blocking agent.

In the PE vacuum aluminized composite film, the melt flow rate of the low-density polyethylene is 0.2-0.3g/10min, and the density is 0.900-0.920g/cm³。

In the PE vacuum aluminized composite film, the melt flow rate of the metallocene polyethylene is 1.0-1.3g/10min, and the density is 0.920-0.940g/cm³。

In the PE vacuum aluminizing composite film, the antioxidant is a PS-802 antioxidant or an antioxidant 1010.

A preparation method of a PE vacuum aluminized composite film comprises the following steps:

the method comprises the following steps: weighing low-density polyethylene, metallocene polyethylene, surface adhesive resin, linear polyethylene, an antioxidant, a heat stabilizer, an ultraviolet blocking agent and an anti-blocking agent in corresponding parts by mass, adding the weighed materials into a three-section co-extrusion type extruder, heating to 185 ℃ at the temperature of 170-;

step two: raising the temperature of the three-layer co-extrusion die to 200-220 ℃, reducing the pressure to below 300Pa, reacting for 1-3min under the condition to obtain a polymer melt, and then sequentially extruding, blowing, cooling, corona and trimming the prepared polymer melt to obtain a PE sheet film;

step three: melting the PE film prepared in the step two, sequentially extruding, molding by a die head, rolling and spreading by a main roller, stretching at 160 ℃ in two directions by 120 plus materials, cooling and shaping, measuring the thickness, rolling, slitting, packaging and printing to obtain a PE composite base film;

step four: and (3) placing the PE composite base film prepared in the third step in a vacuum aluminizing machine for vacuum aluminizing, and forming an aluminizer on one side of the PE composite base film.

Compared with the prior art, the invention has the advantages that:

1. the surface adhesive resin is added in the PE composite base film provided by the invention, so that the adhesion of the PE composite base film to an aluminizer is greatly improved, and the problem of shedding of the aluminizer is prevented.

2. The anti-adhesion agent is added into the PE composite base film, so that the prepared packaging bag is not easy to adhere and has good opening performance.

3. The metallocene polyethylene is added, so that the product has high comprehensive mechanical property and high thermal forming property.

4. The preparation method provided by the invention is simple and easy to operate, and can realize large-scale production.

Drawings

FIG. 1 is a schematic structural view of the invention;

in the figure: PE composite basement membrane 1, aluminizer 2.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.