阅读说明：本技术 一种磁性3d水转印膜的制备方法 (Preparation method of magnetic 3D water transfer film ) 是由 陈启斌 于 2020-01-17 设计创作，主要内容包括：本发明公开了一种磁性3D水转印膜的制备方法,属于印刷领域,其制备方法步骤包括：制备水转印膜后,在水转印膜上印刷一层不含铁的底墨,形成底墨层,在底墨层上涂布磁性油墨,随后在磁场中定向成型形成图案,经过自干、热固化或紫外光固化后即得。本发明磁性3D水转印膜的制备方法简单高效,条件温和,无有毒有害物质排放,所制备的磁性3D水转印膜耐磨、抗拉伸,转印效果好,且具有立体3D效果的图案,美观实用。(The invention discloses a preparation method of a magnetic 3D water transfer printing film, belonging to the field of printing, and the preparation method comprises the following steps: after preparing the water transfer printing film, printing a layer of iron-free bottom ink on the water transfer printing film to form a bottom ink layer, coating magnetic ink on the bottom ink layer, then forming a pattern in a magnetic field in an oriented mode, and obtaining the water transfer printing film after self-drying, thermocuring or ultraviolet curing. The preparation method of the magnetic 3D water transfer printing film is simple and efficient, mild in condition and free of toxic and harmful substance emission, and the prepared magnetic 3D water transfer printing film is wear-resistant, stretch-resistant, good in transfer printing effect, attractive and practical, and has patterns with three-dimensional 3D effects.)

1. The preparation method of the magnetic 3D water transfer printing film is characterized by comprising the following steps:

1) dissolving polyvinyl alcohol into film stock solution with the concentration of 10% -20% by water, mixing the film stock solution with an auxiliary agent, and preparing the water transfer film by a casting method or a melt extrusion method for later use;

2) printing a base ink on the water transfer printing film to form a base ink layer, wherein the iron content in the base ink is 0;

3) after the magnetic ink is coated on the bottom ink layer, forming a pattern in a magnetic field in an oriented mode;

4) and curing the water transfer printing film after the pattern is formed to obtain the magnetic 3D water transfer printing film.

2. The method for preparing the magnetic 3D water transfer film according to claim 1, wherein the temperature of the production environment of the magnetic 3D water transfer film is 20 ℃ and the humidity is 45-55% RH.

3. The method for preparing the magnetic 3D water transfer film according to claim 1, wherein the auxiliary agent in step 1) is a plasticizer, or a mixture of the plasticizer and a surfactant, or a mixture of the plasticizer, the surfactant and starch.

4. The method for preparing a magnetic 3D water transfer film according to claim 1, wherein the magnetic ink in step 3) contains 5% -20% of iron-based pearlescent pigment.

5. The method for preparing the magnetic 3D water transfer film according to claim 1, wherein the magnetic field in step 3) is formed by a magnetic mold, and the magnetic mold is disposed on a side of the water transfer film away from the magnetic ink.

6. The method for preparing the magnetic 3D water transfer film according to claim 1, wherein the printing in step 2) is screen printing, spraying, roll coating, curtain coating, gravure printing, offset printing.

7. The method for preparing the magnetic 3D water transfer film according to claim 1, wherein the curing in step 4) is self-drying, thermal curing or ultraviolet curing.

Technical Field

The invention relates to a preparation method of a water transfer printing film, in particular to a preparation method of a magnetic 3D water transfer printing film, and belongs to the field of printing.

Background

Water transfer printing is a kind of special printing technology, which is a printing technology that uses water pressure to hydrolyze polymer of transfer paper/plastic film with patterns and then coat the paper/plastic film on the surface of a product.

Generally, water transfer printing can be divided into water mark transfer printing and water coating transfer printing, and the difference between the water mark transfer printing and the water coating transfer printing is the difference of transfer printing materials, the water mark transfer printing realizes the transfer of pictures and texts by transfer printing paper, and the water coating transfer printing depends on a transfer printing film with excellent flexibility.

The water transfer printing is applied by a special carrier, so that not only can the printing of pictures and texts on various materials such as plastics, paper, metal, ceramics and the like be realized, but also the printing on printing materials with different shapes such as planes, rhombuses, curved surfaces, concave surfaces and the like can be satisfied.

With the improvement of the requirements of people on product packaging and decoration, the water transfer printing is more and more widely used, wherein the water transfer printing film is the key of the water transfer printing, mainly because the water transfer printing film is a carrier of ink and directly contacts with a printed product, and the printing effect has a great relationship with the water transfer printing film, but the existing ink has a single form, has higher requirements on more complex pattern printing, has higher difficulty and is difficult to obtain the expected effect.

Disclosure of Invention

In view of this, the present invention provides a method for preparing a magnetic 3D water transfer film, so as to conveniently and efficiently prepare a water transfer film having a three-dimensional 3D pattern.

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

a preparation method of a magnetic 3D water transfer film comprises the following steps:

1) dissolving polyvinyl alcohol into film stock solution with the concentration of 10% -20% by water, mixing the film stock solution with an auxiliary agent, and preparing the water transfer film by a casting method or a melt extrusion method for later use;

2) printing base ink on the water transfer printing film to form a base ink layer, wherein the iron content in the base ink is 0;

3) after the magnetic ink is coated on the bottom ink layer, forming a pattern in a magnetic field in an oriented mode;

4) and curing the water transfer printing film after the pattern is formed to obtain the magnetic 3D water transfer printing film.

The preparation method of the water transfer printing film is mature, the preparation is generally carried out by adopting a casting method or a melt extrusion method in the prior art, the specific operation is as follows,

the casting method comprises the following steps: dissolving polyvinyl alcohol (PVA) as a raw material into an aqueous solution to obtain a film stock solution, casting the film stock solution from a gap or coating the film stock solution on a rotating drying drum or a belt by a roll coater, evaporating water to form a dry film, if water resistance is required, performing heat treatment on the film in an environment of 120 ℃ or higher, and if necessary, coating a powder for preventing adhesion so as to avoid adhesion between the films.

Melt extrusion method: since the polyvinyl alcohol is melted at a temperature higher than the thermal decomposition temperature, the polyvinyl alcohol, an appropriate amount of water and a plasticizer are granulated and blown or rolled or biaxially stretched to form a film by an apparatus having dissolving, kneading and defoaming functions before melt extrusion, and similarly, the water transfer film produced by the melt extrusion method may be subjected to heat treatment, coating with a powder for preventing adhesion, and the like after the production.

Further, the temperature of the production environment of the magnetic 3D water transfer film is 20 ℃, and the humidity is 45-55% RH.

Further, the auxiliary agent in the step 1) comprises a plasticizer, or a mixture of the plasticizer and a surfactant, or a mixture of the plasticizer, the surfactant and starch.

Adopt above-mentioned further beneficial effect to lie in: in order to make the prepared film flexible, a proper amount of plasticizer, such as glycerol, diglycerol, triglycerol, trimethylolpropane, mannitol, sorbitol, pentaerythritol, etc., needs to be added;

in the water transfer printing process, the surface tension of the water transfer printing film is an important influence factor of the transfer printing effect, and a surfactant can be added to change the tension of the water transfer printing film when necessary so as to reduce the surface tension of the contact surface of the water transfer printing film and water, such as glycerol ether;

researches show that after starch is added into the raw materials for preparing the PVA water transfer printing film, the viscosity of the solution can be increased, the dissolution time of the film is prolonged, the elongation rate on water is reduced, the water content is reduced, the tensile strength is enhanced, the deformation is reduced, and the adding amount of the starch is 0-2.5% of the total mass of the raw materials under the normal condition;

in addition, since foam may be generated during the film preparation, an appropriate amount of an antifoaming agent may be added thereto, or an antioxidant, a stabilizer, a colorant, a fragrance, an extender, an antifoaming agent, a rust preventive, an ultraviolet absorber, etc. may be added thereto in an appropriate amount according to actual production requirements.

Further, the magnetic ink in the step 3) contains 5% -20% of iron-based pearlescent pigment.

Adopt above-mentioned further beneficial effect to lie in: the magnetic ink comprises one or more of epoxy propylene, polyurethane propylene and polyester propylene, and additives for improving the performance of the magnetic ink, such as silicone oil-containing defoaming agent, stabilizer, dispersant, colorant and the like, wherein the content of the iron-based pearlescent pigment is determined to be 5-20%, so that the iron-based pearlescent pigment can fully embody the characteristics of the magnetism and the pearlescent pigment on the premise of ensuring the basic performance of the ink, the magnetic ink can be completely drawn and extended under the magnetic field environment, and the obtained pattern is clear and beautiful.

Further, the magnetic field in the step 3) is formed by a magnetic mold, and the magnetic mold is arranged on one side of the water transfer printing film, which is far away from the magnetic ink.

Adopt above-mentioned further beneficial effect to lie in: and drawing at the end far away from the magnetic ink to enable the magnetic ink to be partially drawn and stretched, namely, part of the magnetic ink is drawn and stretched to form a pattern in a specified area, and part of the magnetic ink is not drawn and stretched and still stays at the initial position, so that the pattern obtained in this way is more attractive.

Further, the printing in the step 2) is screen printing, spraying, roller coating, curtain coating, gravure printing and offset printing;

the curing mode in the step 4) is self-drying, thermocuring or ultraviolet curing.

According to the magnetic 3D water transfer printing film, the magnetic ink contains 5% -20% of iron-based pearlescent pigment, so that the magnetic printing film has the characteristics of magnetism and can be drawn and stretched in a magnetic field, the artificial magnetic field is utilized to artificially disperse the iron-based pearlescent pigment on the water transfer printing film, the iron-free printing ink is not influenced by the magnetic field, and the pearlescent pigment is prepared from mica, has a naturally-formed visual interference effect and usually has a two-color or multi-color interference effect, so that a 3D pattern can be formed on the water transfer printing film after the magnetic pigment is drawn and stretched by the magnetic field.

The preparation method of the magnetic 3D water transfer printing film has the advantages of simplicity, high efficiency, mild conditions, no emission of toxic and harmful substances, wear resistance, stretch resistance, good transfer printing effect, pattern with a three-dimensional 3D effect, and attractiveness and practicability.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described 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 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.

In the following embodiments, the magnetic 3D water transfer films are prepared at 20 ℃ and 45-55% RH;

the casting method and the melt extrusion method involved in the following preparation methods were specifically operated as follows:

the casting method comprises the following steps: and (3) dissolving polyvinyl alcohol into an aqueous solution to obtain a film stock solution, coating the film stock solution on a rotating drying belt through a roller coater, and evaporating water to form a drying film to obtain the water transfer film.

Melt extrusion method: wetting polyvinyl alcohol with water, mixing the polyvinyl alcohol with a plasticizer, stirring the mixture into paste, extruding the paste in an extruder to obtain water transfer film particles, and performing blow molding on the water transfer film particles to obtain the water transfer film.