Production method of shallow net nylon film

Abstract

The invention discloses a production method of a shallow net nylon film, which comprises a shallow net printing layer, a core layer, a heat sealing layer and a functional coating coated on the surface of the shallow net printing layer, the shallow screen printing layer is composed of PA6 and an anti-adhesion agent; the core layer is prepared from PA6, PA1212, maleic anhydride grafted SEBS (Styrene-Ethylene-Butylene-Styrene) and an antistatic agent; the heat sealing layer is composed of PA6 and an anti-adhesion agent. The printing ink is good in toughness, and the shallow screen printing capacity can be improved.

Description

Technical Field

[0001] The invention relates to a method for producing a shallow-net nylon film. Background Art

[0002] Shallow screen printing technology has outstanding advantages such as good formability, rich colors, and high combination accuracy. It is particularly suitable for application in fine printed products with strict quality requirements and high control levels. Shallow screen printing technology overcomes the problems of fading and blurring of printed products produced by flat film printing technology, and promotes the quality of printed products to a higher level. The shallow screen nylon film of the prior art is usually composed of a shallow screen printing layer, a core layer, and a heat sealing layer. After the film is corona treated, an oxidized polarization group can be formed on the surface of the film, generating memory and improving its surface properties, but the surface energy is still not very large, resulting in poor printing effect. Summary of the invention

[0003] In view of the above-mentioned defects of the prior art, an object of the present invention is to provide a method for producing a shallow mesh nylon film.

[0004] To solve the above problems, the technical solution of the present invention is: a method for producing a shallow mesh nylon film, which includes a shallow mesh printing layer, a core layer, a heat sealing layer, and also includes a functional coating coated on the surface of the shallow mesh printing layer; The shallow screen printing layer is composed of PA6 and anti-adhesive agent; The core layer is composed of PA6, PA1212, maleic anhydride grafted SEBS, and antistatic agent; The heat seal layer is composed of PA6 and anti-adhesive agent; The production method comprises the following steps: (1) Prepare raw materials according to the components of shallow screen printing layer, core layer and heat sealing layer; (2) The raw materials of the shallow screen printing layer, the core layer, and the heat sealing layer are mixed separately and sent to their respective extruders for mixing and plasticizing; (3) The molten melts are fed into the die heads respectively, and the melts are combined in the die heads and then pass through the flat die head opening to form a molten sheet; (4) Using an air knife to attach the sheet to a chilled roller to quench it into an unshaped sheet, and then cooling it in a water bath to shape the sheet into a cast sheet; (5) The cast sheet is stretched to form a film; (6) Corona treatment of the surface of the shallow screen printing layer; (7) preparing a coating liquid for a functional coating, the coating liquid comprising water-based polyurethane, tetraethyl orthosilicate, deionized water, hydrochloric acid, anhydrous ethanol, and nano-silicon dioxide, spraying the coating liquid on the surface of the shallow screen printing layer, and curing the film at room temperature for 20 hours; (8) Roll up the film.

[0005] Furthermore, the components of the shallow screen printing layer are as follows by mass ratio: PA6 99%, anti-adhesive agent 1%; The components of the core layer are as follows by mass ratio: PA6 60%, PA1212 25%, maleic anhydride grafted SEBS 14%, and antistatic agent 1%.

[0006] The components of the heat sealing layer are as follows by mass ratio: PA6 99% and anti-adhesive agent 1%.

[0007] Furthermore, in step (7), the components of the coating liquid of the functional coating are as follows in terms of mass ratio: 19.4% aqueous polyurethane, 0.2% ethyl orthosilicate, 32% deionized water, 0.2% hydrochloric acid, 48% anhydrous ethanol, and 0.2% nano-silicon dioxide.

[0008] The beneficial effects of the present invention are as follows: PA6 of the core layer has the problem of poor low temperature performance, while PA1212 has very good low temperature performance, but PA6 and PA1212 are incompatible, and the addition of maleic anhydride grafted SEBS greatly improves the compatibility of the two, and the blending system can obtain higher toughness; The coating liquid of the functional coating is PU-SiO2 coating liquid, which is a transparent coating after curing and has good wear resistance. Under the joint action of silicon dioxide and the hydrolysis product of tetraethyl orthosilicate, a three-dimensional fractal structure with nanopores is formed, making the wettability of the film surface super hydrophilic, thereby improving the printing ability of the film surface. Implementation

[0009] In order to more intuitively and completely understand the technical solution of the present invention, a non-limiting feature description is now provided as follows: A method for producing a shallow-net nylon film, comprising a shallow-net printing layer, a core layer, a heat-sealing layer, and a functional coating coated on the surface of the shallow-net printing layer; The shallow screen printing layer is composed of PA6 and anti-adhesive agent; The core layer is composed of PA6, PA1212, maleic anhydride grafted SEBS, and antistatic agent; The heat seal layer is composed of PA6 and anti-adhesive agent; The production method comprises the following steps: (1) Prepare raw materials according to the components of shallow screen printing layer, core layer and heat sealing layer; (2) The raw materials of the shallow screen printing layer, the core layer, and the heat sealing layer are mixed separately and sent to their respective extruders for mixing and plasticizing; (3) The molten melts are fed into the die heads respectively, and the melts are combined in the die heads and then pass through the flat die head opening to form a molten sheet; (4) Using an air knife to attach the sheet to a chilled roller to quench it into an unshaped sheet, and then cooling it in a water bath to shape the sheet into a cast sheet; (5) The cast sheet is stretched to form a film; (6) Corona treatment of the surface of the shallow screen printing layer; (7) preparing a coating liquid for a functional coating, the coating liquid comprising water-based polyurethane, tetraethyl orthosilicate, deionized water, hydrochloric acid, anhydrous ethanol, and nano-silicon dioxide, spraying the coating liquid on the surface of the shallow screen printing layer, and curing the film at room temperature for 20 hours; (8) Roll up the film.

[0010] The components of the shallow screen printing layer are as follows by mass ratio: PA6 99%, anti-adhesive agent 1%; The components of the core layer are as follows by mass ratio: PA6 60%, PA1212 25%, maleic anhydride grafted SEBS 14%, and antistatic agent 1%.

[0011] The components of the heat sealing layer are as follows by mass ratio: PA6 99% and anti-adhesive agent 1%.

[0012] The anti-adhesive agent is silica, and the antistatic agent is a mixture of stearyl glyceryl and oleamide.

[0013] In step (7), the components of the coating liquid of the functional coating are as follows by mass ratio: 19.4% aqueous polyurethane, 0.2% tetraethyl orthosilicate, 32% deionized water, 0.2% hydrochloric acid, 48% anhydrous ethanol, and 0.2% nano-silicon dioxide. When preparing the coating liquid, the aqueous polyurethane, deionized water, and anhydrous ethanol are first mixed in a container, and then stirred for 20 minutes with a magnetic stirrer to form a uniform dispersion, and then tetraethyl orthosilicate and hydrochloric acid are added and stirred for another 20 minutes, and then nano-silicon dioxide is added and stirred for 5 hours.

[0014] The PA6 of the core layer has poor low temperature performance, while PA1212 has very good low temperature performance. However, PA6 and PA1212 are incompatible. The addition of maleic anhydride grafted SEBS greatly improves the compatibility of the two, and the blending system can obtain higher toughness. The coating liquid of the functional coating is PU-SiO2 coating liquid, which is a transparent coating after curing and has good wear resistance. Under the joint action of silicon dioxide and the hydrolysis product of tetraethyl orthosilicate, a three-dimensional fractal structure with nanopores is formed, making the wettability of the film surface super hydrophilic, thereby improving the printing ability of the film surface.

Claims

1. A method for producing a shallow mesh nylon film, comprising a shallow mesh printing layer, a core layer, and a heat sealing layer, characterized in that: It also includes a functional coating layer coated on the surface of the shallow screen printing layer; The shallow screen printing layer is composed of PA6 and anti-adhesive agent; The core layer is composed of PA6, PA1212, maleic anhydride grafted SEBS, and antistatic agent; The heat seal layer is composed of PA6 and anti-adhesive agent; The production method comprises the following steps: (1) Prepare raw materials according to the components of shallow screen printing layer, core layer and heat sealing layer; (2) The raw materials of the shallow screen printing layer, the core layer, and the heat sealing layer are mixed separately and sent to their respective extruders for mixing and plasticizing; (3) The molten melts are fed into the die heads respectively, and the melts are combined in the die heads and then pass through the flat die head opening to form a molten sheet; (4) Using an air knife to attach the sheet to a chilled roller to quench it into an unshaped sheet, and then cooling it in a water bath to shape the sheet into a cast sheet; (5) The cast sheet is stretched to form a film; (6) Corona treatment of the surface of the shallow screen printing layer; (7) preparing a coating liquid for a functional coating, the coating liquid comprising water-based polyurethane, tetraethyl orthosilicate, deionized water, hydrochloric acid, anhydrous ethanol, and nano-silicon dioxide, spraying the coating liquid on the surface of the shallow screen printing layer, and curing the film at room temperature for 20 hours; (8) Roll up the film.

2. The method for producing a shallow mesh nylon film according to claim 1, characterized in that: The components of the shallow screen printing layer are as follows by mass ratio: PA6 99%, anti-adhesive agent 1%; The components of the core layer are as follows by mass ratio: PA6 60%, PA1212 25%, maleic anhydride grafted SEBS 14%, antistatic agent 1%; The components of the heat sealing layer are as follows by mass ratio: PA6 99% and anti-adhesive agent 1%.

3. The method for producing a shallow-net nylon film according to claim 1, characterized in that: In step (7), the components of the coating liquid of the functional coating are as follows in terms of mass ratio: 19.4% aqueous polyurethane, 0.2% ethyl orthosilicate, 32% deionized water, 0.2% hydrochloric acid, 48% anhydrous ethanol, and 0.2% nano-silicon dioxide.