阅读说明：本技术 一种烫画膜及其生产工艺 (Pyrograph film and production process thereof ) 是由 王一良 何建雄 杨博 于 2020-04-21 设计创作，主要内容包括：本发明涉及一种烫画膜及其生产工艺,所述烫画膜包括依次连接的防粘层、基底层、离型层、聚氨酯层、油墨层和胶层。本发明所涉及的烫画膜具有新型的六层结构,其中离型层是为了在加工过程中,让载体与油墨层更好地分离；其中防粘层是为了防止烫画膜卷起时与胶层黏在一起；其中聚氨酯层是主要的功能层,使得所述烫画膜的附着力和耐候性能更好。(The invention relates to a pyrograph film and a production process thereof. The pyrograph film has a novel six-layer structure, wherein the release layer is used for better separating the carrier from the ink layer in the processing process; the anti-sticking layer is used for preventing the pyrograph film from being stuck with the adhesive layer when being rolled up; the polyurethane layer is a main functional layer, so that the adhesion and weather resistance of the pyrograph film are better.)

1. The utility model provides a pyrography membrane which characterized in that, the pyrography membrane is including antiseized layer, stratum basale, release layer, polyurethane layer, printing ink layer and the glue film that connects gradually.

2. A pyrograph film according to claim 1, wherein the base layer comprises a PET film or a PVC film;

preferably, the thickness of the PET film is 15-25 μm;

preferably, the thickness of the PVC film is 25-40 μm.

3. A pyrograph film according to claim 1 or 2, wherein the release layer comprises a polytetrafluoroethylene coating;

preferably, the thickness of the release layer is 5 to 10 μm.

4. A pyrograph film according to any one of claims 1-3, wherein the release layer comprises a water-based self-crosslinking silicone layer;

preferably, the thickness of the release layer is 15-25 μm;

preferably, the thickness of the ink layer is 10-15 μm;

preferably, the thickness of the glue layer is 30-50 μm.

5. A pyrograph film according to any one of claims 1 to 4, wherein the polyurethane layer is prepared from raw materials comprising the following components: diisocyanate, polyethylene glycol, a chain extender, a catalyst, an antioxidant and mesoporous silica nanoparticles;

preferably, the polyurethane layer is prepared from the following raw materials in parts by weight: 20-40 parts of diisocyanate, 40-80 parts of polyethylene glycol, 5-20 parts of a chain extender, 5-10 parts of a catalyst, 5-10 parts of an antioxidant and 20-40 parts of mesoporous silica nanoparticles.

6. The decal film of claim 5, wherein said diisocyanate comprises an aliphatic diisocyanate and/or an aromatic diisocyanate, preferably an aliphatic diisocyanate;

preferably, the relative molecular mass of the polyethylene glycol is 4000-8000.

7. The pyrograph film of claim 5 or 6, wherein the chain extender comprises any one of ethylene glycol, ethylene diamine, 1, 3-propanediol, 1, 4-butanediol, hexanediol, diethylene glycol, or 1, 5-pentanediol, or a combination of at least two thereof;

preferably, the catalyst comprises any one of stannous octoate, dibutyltin dioctoate or dibutyltin laurate or a combination of at least two of the same;

preferably, the antioxidant comprises any one of or a combination of at least two of hindered phenolic antioxidants, hindered amine antioxidants or phosphite antioxidants;

preferably, the mesoporous silica nanoparticles have an average particle size of 200-500 nm.

8. A process for producing a pyrograph film according to any one of claims 1 to 7, wherein the process comprises: and coating a release layer, a polyurethane layer, an ink layer and a glue layer on one side of the basal layer in sequence, drying, coating an anti-sticking layer on the other side of the basal layer, and drying to obtain the pyrograph film.

9. The production process of the pyrograph film as claimed in claim 8, wherein the release layer is coated and dried at 60-100 ℃ for 7-8 h;

preferably, the polyurethane layer is dried for 2 to 3 hours at the temperature of between 40 and 80 ℃;

preferably, the ink layer is dried for 3 to 4 hours at the temperature of 80 to 120 ℃;

preferably, the glue layer is dried for 1-2h at 60-90 ℃;

preferably, the release layer is dried at 60-90 ℃ for 1-2h after being coated.

10. The production process of the pyrograph film according to claim 8 or 9, characterized by specifically comprising the steps of:

(1) coating a release layer on one side of the substrate layer, and drying for 7-8h at 60-100 ℃;

(2) coating a polyurethane layer on one side of the release layer, which is far away from the substrate layer, and drying for 2-3h at 40-80 ℃;

(3) coating an ink layer on one side of the polyurethane layer, which is far away from the release layer, and drying for 3-4h at the temperature of 80-120 ℃;

(4) coating a glue layer on one side of the ink layer, which is far away from the polyurethane layer, and drying for 1-2h at the temperature of 60-90 ℃;

(5) and coating an anti-sticking layer on the other side of the substrate layer, and drying for 1-2h at 60-90 ℃ to obtain the pyrograph film.

Technical Field

The invention belongs to the technical field of pyrograph films, and particularly relates to a pyrograph film and a production process thereof.

Background

Pyrography is a type of printing, and is essentially a process of printing a pattern or text on a base film in advance, and then printing the pattern and text of a printed layer on a substrate such as clothes by the action of heat and pressure. The pyrograph is a mature printing technology, is green and environment-friendly, does not need plate making, does not need batch production, can form a multicolor pattern at one time, does not need color register, has rich pattern layers, small color difference and good reproducibility, and can achieve the effect required by a pattern designer. However, the existing pyrograph film still has some problems, such as insufficient adhesion, limited performances of wear resistance, corrosion resistance, yellowing resistance, water resistance and the like, and the defects are not favorable for long-term storage of patterns on a printing stock. Therefore, it is very useful to develop a new pyrograph film which can overcome the above-mentioned drawbacks.

Disclosure of Invention

Aiming at the defects of the prior art, the invention aims to provide a pyrograph film and a production process thereof.

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

on one hand, the invention provides a pyrograph film which comprises an anti-sticking layer, a substrate layer, a release layer, a polyurethane layer, an ink layer and an adhesive layer which are sequentially connected.

The pyrograph film related by the invention has a six-layer structure of an anti-sticking layer, a substrate layer, a release layer, a polyurethane layer, an ink layer and an adhesive layer, wherein the release layer is used for better separating a carrier from the ink layer in the processing process; the anti-sticking layer is used for preventing the pyrograph film from being stuck with the adhesive layer when being rolled up; the polyurethane layer is a main functional layer, so that the adhesion and weather resistance of the pyrograph film are better. The pyrograph film has good surface coloring performance.

When the pyrograph film is not used, a paper layer (such as pearlescent paper, glassine paper, kraft paper and the like) is further coated on one side of the glue layer, and when the pyrograph film is used, the paper layer is torn off and is hot-pressed on a printing stock, and the operation temperature is 100-130 ℃.

Preferably, the substrate layer comprises a PET film or a PVC film.

Preferably, the thickness of the PET film is 15-25 μm, such as 15 μm, 18 μm, 20 μm, 22 μm, 24 μm, 25 μm, or the like.

Preferably, the thickness of the PVC film is 25-40 μm, such as 25 μm, 28 μm, 30 μm, 32 μm, 35 μm, 36 μm, 38 μm or 40 μm, etc.

Preferably, the release layer comprises a polytetrafluoroethylene coating.

Preferably, the release layer has a thickness of 5-10 μm, such as 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, or 10 μm, etc.

Preferably, the release layer comprises a water-based self-crosslinking silicone layer.

Preferably, the thickness of the release layer is 15-25 μm, such as 15 μm, 18 μm, 20 μm, 22 μm, 24 μm or 25 μm, etc.

Preferably, the thickness of the ink layer is 10-15 μm, such as 10 μm, 11 μm, 12 μm, 13 μm, 14 μm, or 15 μm, etc.

Preferably, the thickness of the glue layer is 30-50 μm, such as 30 μm, 32 μm, 33 μm, 34 μm, 35 μm, 40 μm, 42 μm, 45 μm or 50 μm, etc.

In the invention, the preparation raw materials of the polyurethane layer comprise the following components: diisocyanate, polyethylene glycol, a chain extender, a catalyst, an antioxidant and mesoporous silica nanoparticles.

The diisocyanate and the polyethylene glycol in the raw materials are basic materials for forming the polyurethane material through polymerization, the polyurethane material has good flexibility and mechanical strength, the mesoporous silica nano particles are added into the polyurethane material, so that the weather resistance and the adhesive force of the product are remarkably enhanced, and the performances are more remarkable when the components meet the following mass ratio relationship.

Preferably, the polyurethane layer is prepared from the following raw materials in parts by weight: 20-40 parts of diisocyanate, 40-80 parts of polyethylene glycol, 5-20 parts of a chain extender, 5-10 parts of a catalyst, 5-10 parts of an antioxidant and 20-40 parts of mesoporous silica nanoparticles.

The diisocyanate may be present in an amount of 20, 25, 28, 30, 32, 34, 35, 38, or 40 parts by weight. The point values in the range can be selected, and are not described in detail herein.

The polyethylene glycol can be 40 parts, 45 parts, 50 parts, 55 parts, 60 parts, 65 parts, 70 parts, 75 parts or 80 parts by weight. The point values in the range can be selected, and are not described in detail herein.

The weight portion of the chain extender can be 5, 8, 10, 12, 15, 16, 17, 18 or 20 parts. The point values in the range can be selected, and are not described in detail herein.

The catalyst can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts by weight. The point values in the range can be selected, and are not described in detail herein.

The antioxidant can be 5 parts, 6 parts, 7 parts, 8 parts, 9 parts or 10 parts by weight. The point values in the range can be selected, and are not described in detail herein.

The mesoporous silica nanoparticles can be 20 parts, 25 parts, 28 parts, 30 parts, 32 parts, 34 parts, 35 parts, 38 parts or 40 parts by weight. The point values in the range can be selected, and are not described in detail herein.

Preferably, the diisocyanate comprises an aliphatic diisocyanate and/or an aromatic diisocyanate, preferably an aliphatic diisocyanate. Aliphatic diisocyanates are more effective than aromatic diisocyanates.

Preferably, the relative molecular mass of the polyethylene glycol is 4000-8000, such as 4000, 5000, 6000, 7000 or 8000, etc. Polyethylene glycols of lower degree of polymerization have a better effect than polyethylene glycols of higher degree of polymerization.

Preferably, the chain extender comprises any one of ethylene glycol, ethylenediamine, 1, 3-propanediol, 1, 4-butanediol, hexanediol, diethylene glycol or 1, 5-pentanediol or a combination of at least two thereof; the combination of at least two of the foregoing, for example, a combination of ethylene glycol and ethylenediamine, a combination of 1, 3-propanediol and 1, 4-butanediol, a combination of 1, 4-butanediol, hexanediol and diethylene glycol, and the like, and any other combination method is not described in detail. A combination of 1, 4-butanediol, hexanediol and diethylene glycol is preferred.

Preferably, the catalyst comprises any one of stannous octoate, dibutyltin dioctoate or dibutyltin laurate or a combination of at least two of the same; the combination of at least two of the above compounds, for example, the combination of stannous octoate and dibutyltin dioctoate, the combination of dibutyltin dioctoate and dibutyltin laurate, the combination of stannous octoate and dibutyltin laurate, and the like, and any other combination modes are not described herein.

Preferably, the antioxidant comprises any one of or a combination of at least two of hindered phenolic antioxidants, hindered amine antioxidants or phosphite antioxidants; the combination of at least two of the above-mentioned antioxidants may be, for example, a combination of a hindered phenol antioxidant and a hindered amine antioxidant, a combination of a hindered amine antioxidant and a phosphite antioxidant, a combination of a hindered phenol antioxidant and a phosphite antioxidant, and the like, and any combination manner is not described herein.

Preferably, the mesoporous silica nanoparticles have an average particle size of 200-500nm, such as 200nm, 250nm, 300nm, 350nm, 400nm, 450nm, 500nm, and the like.

When the particle size of the mesoporous silica nano particles meets the numerical range, the pyrograph film has good weather resistance, and the stability of the film structure can be ensured.

In another aspect, the present invention provides a production process of the pyrograph film as described above, including: and coating a release layer, a polyurethane layer, an ink layer and a glue layer on one side of the basal layer in sequence, drying, coating an anti-sticking layer on the other side of the basal layer, and drying to obtain the pyrograph film.

The production process of the pyrograph film is simple and easy to operate, and is suitable for industrial expanded production.

Preferably, the release layer is dried for 7-8h (7h, 7.5h or 8h, etc.) at 60-100 ℃ (e.g., 60 ℃, 70 ℃, 80 ℃, 90 ℃ or 100 ℃, etc.) after coating.

Preferably, the polyurethane layer is dried for 2-3h (2h, 2.5h, 3h, etc.) at 40-80 ℃ (e.g., 40 ℃, 50 ℃, 60 ℃, 70 ℃, or 80 ℃, etc.) after coating.

Preferably, the ink layer is dried at 80-120 deg.C (e.g., 80 deg.C, 90 deg.C, 100 deg.C, 110 deg.C, or 120 deg.C, etc.) for 3-4h (3h, 3.5h, or 4h, etc.) after being applied.

Preferably, the glue layer is dried for 1-2h (1h, 1.5h, 2h, etc.) at 60-90 ℃ (e.g., 60 ℃, 65 ℃, 70 ℃, 80 ℃, or 90 ℃, etc.) after coating.

Preferably, the release layer is coated and then dried at 60-90 deg.C (e.g., 60 deg.C, 65 deg.C, 70 deg.C, 80 deg.C, or 90 deg.C, etc.) for 1-2h (1h, 1.5h, or 2h, etc.).

When the pyrograph film is prepared, after each layer of material is coated, the pyrograph film needs to be dried under different drying conditions, so that the stability of the product structure can be best ensured, and the excellent performance of the product is further ensured.

As a preferred technical scheme of the invention, the production process of the pyrograph film specifically comprises the following steps:

(1) coating a release layer on one side of the substrate layer, and drying for 7-8h at 60-100 ℃;

(2) coating a polyurethane layer on one side of the release layer, which is far away from the substrate layer, and drying for 2-3h at 40-80 ℃;

(3) coating an ink layer on one side of the polyurethane layer, which is far away from the release layer, and drying for 3-4h at the temperature of 80-120 ℃;

(4) coating a glue layer on one side of the ink layer, which is far away from the polyurethane layer, and drying for 1-2h at the temperature of 60-90 ℃;

(5) and coating an anti-sticking layer on the other side of the substrate layer, and drying for 1-2h at 60-90 ℃ to obtain the pyrograph film.

Compared with the prior art, the invention has the following beneficial effects:

the pyrograph film related by the invention has a six-layer structure of an anti-sticking layer, a substrate layer, a release layer, a polyurethane layer, an ink layer and an adhesive layer, wherein the release layer is used for better separating a carrier from the ink layer in the processing process; the anti-sticking layer is used for preventing the pyrograph film from being stuck with the adhesive layer when being rolled up; the polyurethane layer is a main functional layer, so that the adhesion and weather resistance of the pyrograph film are better. The pyrograph film has good surface coloring performance.

Detailed Description

To further illustrate the technical means and effects of the present invention, the following further describes the technical solution of the present invention with reference to the preferred embodiments of the present invention, but the present invention is not limited to the scope of the embodiments.

The following examples and comparative examples relate to polyurethane materials prepared according to conventional techniques known to those skilled in the art, in which diisocyanate, polyethylene glycol, catalyst, chain extender and antioxidant are vacuum-dehydrated and then mixed in a formulation ratio and reacted under stirring to obtain polyurethane materials.

The release layer materials related to the following examples and comparative examples are water-based self-crosslinking organic silicon, and are prepared by taking octamethylcyclotetrasiloxane, a vinyl silane coupling agent and an acrylic acid monomer as raw materials and adopting an emulsion polymerization process. The following examples and comparative examples relate to a hot melt adhesive as the material of the adhesive layer, a polytetrafluoroethylene coating as the release layer, a PET film as the substrate layer and offset thermosetting ink as the ink.