阅读说明：本技术 一种带特殊光泽效果的金属包装印涂方法 (Metal package printing and coating method with special gloss effect ) 是由 周必榜 于 2021-07-27 设计创作，主要内容包括：本发明涉及金属包装技术领域,针对现有技术中特殊光泽效果容易对印刷面产生遮盖效果的问题,提供一种带特殊光泽效果的金属包装印涂方法,所述特殊光泽效果为成品光泽度不低于80°的珍珠光泽效果或成品光泽度不高于40°的哑光光泽效果,印涂方法为首先对金属表面涂布基础外涂,然后涂布特殊光泽效果外涂,再印刷、涂布亮光油层,这样将特殊光泽效果涂层设置在印刷涂层下,在选用高珠光光泽或哑光光泽的特殊光泽效果表达情况下,既能够显现特殊光泽效果表达,而且避免了特殊光泽效果遮盖印刷图层。(The invention relates to the technical field of metal packaging, and provides a metal packaging printing and coating method with a special gloss effect aiming at the problem that the special gloss effect is easy to generate a covering effect on a printing surface in the prior art, wherein the special gloss effect is a pearl gloss effect of which the finished product gloss is not lower than 80 degrees or a matte gloss effect of which the finished product gloss is not higher than 40 degrees.)

1. A method for printing and coating a metal package with a special gloss effect, wherein the special gloss effect is a pearl gloss effect with the finished product gloss not lower than 80 degrees or a matte gloss effect with the finished product gloss not higher than 40 degrees, and is characterized in that a base outer coating is coated on the surface of the metal, then the special gloss effect outer coating is coated, and then a gloss oil layer is printed and coated.

2. The printing and coating method for metal package with special luster effect according to claim 1, characterized in that,

when the special gloss effect is a pearl gloss effect, the coating used for external coating of the special gloss effect contains 3-10 wt% of pearl powder;

when the special gloss effect is a matte gloss effect, the coating used for the external coating with the special gloss effect contains 10-20 wt% of matte powder.

3. The printing and coating method for the metal package with the special gloss effect according to claim 1 or 2, wherein the special gloss effect outer coating is dried by heat curing, the curing temperature is 150-200 ℃, and the film weight thickness is 5-8 g/m²。

4. The method for printing and coating the metal package with the special gloss effect according to claim 1 or 2, wherein the main resin in the coating for the special gloss effect outer coating is unsaturated polyester resin or epoxy resin, and accounts for 35-50 wt% of the weight of the coating.

5. The method for printing and coating the metal package with the special gloss effect according to claim 4, wherein the coating used for the external coating with the special gloss effect further comprises 1.5-2.2 wt% of nano inorganic filler and 0.2-0.5 wt% of dispersant based on the weight of the coating.

6. The printing and coating method for the metal package with the special luster effect as recited in claim 5, wherein the nano inorganic filler is calcium sulfate whisker, calcium carbonate powder, titanium dioxide or silicon dioxide.

7. The printing and coating method for metal package with special luster effect as claimed in claim 5, wherein the nano inorganic filler is secondary nano vermiculite powder obtained by the following steps:

taking nano vermiculite, wherein 50-63% of the nano vermiculite by mass is kept at 750-800 ℃ for 2-8 hours, the rest nano vermiculite is kept at 145-150 ℃ for 2-5 hours, and then mixing the nano vermiculite and the rest nano vermiculite to obtain secondary nano vermiculite powder.

8. The method for printing and coating the metal package with the special gloss effect according to claim 4, wherein the coating used for the special gloss effect outer coating further comprises 4-8 wt% of polymethyl methacrylate.

9. The method for printing and coating a metal package with special gloss effect according to claim 1, wherein said special effect overcoat is a full-size roll coating.

Technical Field

The invention relates to the technical field of metal packaging, in particular to a metal packaging printing and coating method with a special gloss effect.

Background

With the continuous change of the demands of personalized printing in the consumer market and differentiated routes of product design, more and more special printing effects are brought to the market, and the luster effect of the special printing and coating of the metal package in the current market mainly comprises pearlescence, matte effect and the like. Due to the particularity of the production equipment and the process of the metal package, the main realization method is to realize the special gloss effect by matching and polishing the printing rear end. Although the surface of the process realizes special gloss, the special effect can cover the printing surface after the printing process due to the polishing, and the process has certain limitation.

Chinese patent CN103317870B discloses a high-resistance glossy and matte mixed metal printing method, which comprises the steps of coating a glossy oil layer on the surface of a metal, printing and coating the glossy oil layer, transferring the glossy oil layer and the matte oil layer to the surface of a product through a rubber blanket, and heating, curing and drying to obtain a special gloss effect that the glossiness of the glossy effect part is not lower than 80 degrees and the glossiness of the matte effect part is not more than 40 degrees. However, the special gloss effect is still arranged on the printing surface, and the printing surface is easily covered.

Disclosure of Invention

Aiming at the problem that the special gloss effect is easy to cover the printing surface in the prior art, the invention aims to provide a metal package printing and coating method with the special gloss effect so as to achieve the purposes of setting the special gloss effect and avoiding influencing the printing color expression.

The invention provides the following technical scheme:

a method for printing and coating the metallic package with special lustre effect includes such steps as coating the metallic surface with basic external paint, coating with special lustre effect, printing and coating with lustre oil layer, and features that the lustre of finished metallic package is not lower than 80 deg. or the lustre of finished metallic package is not higher than 40 deg.

The metal packaging printing and coating method is implemented before a special gloss effect paint film is transferred to a printing coating to overcome a special gloss effect, such as a pearl gloss effect or a matte gloss effect, the printing coating is covered with the special gloss effect paint film, and the special gloss effect is pearl gloss with high glossiness or matte gloss with low glossiness, so that the special gloss effect can be displayed, and the special gloss effect is prevented from covering a printing layer. Meanwhile, the inventor needs to explain that the above technical problems of the present application are solved without depending on a specific external coating method, a special gloss effect coating method, a printing method and a gloss oil layer coating method, wherein the basic external coating, the special gloss effect external coating, the printing coating and the gloss oil layer are all realized by a conventional process method.

As a preference for the process of the present invention,

when the special gloss effect is a pearl gloss effect, the coating used for external coating of the special gloss effect contains 3-10 wt% of pearl powder; when the special gloss effect is a matte gloss effect, the coating used for the external coating with the special gloss effect contains 10-20 wt% of matte powder.

When pearl gloss with high glossiness or matte gloss with low glossiness is obtained, a common technical scheme is adopted, and pearl powder or matte powder with a certain amount is doped.

Preferably, the special gloss effect outer coating is dried by heat curing, the curing temperature is 150-200 ℃, and the film weight and thickness are 5-8 g/m²。

Preferably, the main resin in the coating used for the special gloss effect outer coating is unsaturated polyester resin or epoxy resin, and accounts for 35-50 wt% of the weight of the coating. The components of the coating comprise main resin, a curing agent, a curing accelerator, a solvent and the like, wherein the curing agent and the curing accelerator are selected from curing agents and curing accelerators which are conventionally adopted in unsaturated polyester resin thermosetting or epoxy resin thermosetting.

Preferably, the coating used for the special gloss effect outer coating also comprises 1-1.2 wt% of nano inorganic filler and 0.1-0.2 wt% of dispersant, based on the weight of the coating. Because unsaturated polyester resin and epoxy resin are easy to shrink and even crack during thermosetting, the expression of pearl gloss or matte gloss effect is seriously influenced, more importantly, the adhesive force of a paint film with special gloss effect, a basic outer coating and a printing coating is reduced, and the paint film or printing pictures and texts are dropped and shed after a period of use, the inventor is researched, and nano inorganic filler is added into the paint with special gloss effect to enhance the toughness of the coating with special gloss effect, and the effect of the coating with special gloss effect is particularly better for epoxy resin. The dispersant is conventional dispersant, such as sodium dodecyl benzene sulfonate, sodium polymethacrylate, etc.

As the optimization of the method, the nano inorganic filler is calcium sulfate whisker, calcium carbonate powder, titanium dioxide or silicon dioxide, can achieve higher whiteness, and has smaller influence on the coating with special gloss effect.

Preferably, the nano inorganic filler is secondary nano vermiculite powder obtained by the following steps: taking nano vermiculite, wherein 50-63% of the nano vermiculite by mass is kept at 750-800 ℃ for 2-8 hours, the rest nano vermiculite is kept at 145-150 ℃ for 2-5 hours, and then mixing the nano vermiculite and the rest nano vermiculite to obtain secondary nano vermiculite powder. The inventor considers that the shrinkage can be inhibited or relieved by adding a substance which expands when being heated when aiming at the problem that the curing of the coating resin (unsaturated polyester resin and epoxy resin) shrinks and even forms defects, and the vermiculite is obviously a more ideal choice from the mechanism aspect, and particularly has the general obvious thermal expansion temperature of more than 150 ℃ which is more coincident with the thermal curing temperature. However, in actual research, the inventors have found that vermiculite expansion is relatively severe and that moisture escaping from vermiculite expansion adversely affects the cure of special gloss effect coatings and the surface morphology of paint films. Through repeated research, vermiculite of the main body is heated at high temperature and then expanded in advance and subjected to water removal treatment, the remaining vermiculite is heated firstly to remove physical moisture, the influence of moisture escape is reduced, and then the vermiculite is mixed with the vermiculite subjected to high-temperature treatment, so that the vermiculite subjected to high-temperature treatment of the main body plays a role of an inorganic filler, the vermiculite subjected to low-temperature physical water removal is subjected to controllable expansion at a higher thermosetting temperature, contraction is inhibited, the influence of excessive expansion and moisture escape is avoided, the curing effect can be obviously improved by combining the heated expansion with the supporting effect of the inorganic filler, and the overall effect of the vermiculite is better than that of silicon dioxide and titanium dioxide. The inventor needs to say that from the technical practical application point of view, as the vermiculite has certain color, the method can be applied to the scene with slightly lower requirements on special gloss effect.

Preferably, the coating used for the external coating with the special gloss effect further comprises 4-8 wt% of polymethyl methacrylate. In addition, organic low shrinkage additives such as polymethyl methacrylate may be added to inhibit the curing shrinkage of coating resins, particularly unsaturated polyester resins.

Preferably, the special effect overcoat is a full-face roll coating.

The invention has the following beneficial effects:

compared with the prior art, the special gloss effect coating is arranged under the printing coating, under the condition of selecting the special gloss effect expression of high pearlescent gloss or matte gloss, the special gloss effect expression can be shown, the special gloss effect is prevented from covering the printing image layer, the problem that the printing coating is easy to paint off due to the fact that the special gloss effect moves downwards is also avoided, and the special gloss effect layer and the printing image-text layer have high adhesive force and scratch-resistant hardness.

Drawings

FIG. 1 is a photo of a tin plate with special gloss effect printed on the surface of the tin plate prepared by the method of the invention.

FIG. 2 is a photo of a tinplate with special gloss effect printed on the surface of a tinplate prepared by a conventional printing method.

Detailed Description

The following further describes the embodiments of the present invention.

The starting materials used in the present invention are commercially available or commonly used in the art, unless otherwise specified, and the methods in the following examples are conventional in the art, unless otherwise specified.

The basic overcoating, printing, applying a gloss oil layer and applying a special gloss effect overcoating, to which the present invention relates, are conventional processes for metal packaging, and for convenience of explanation and comparison, in the following examples and comparative examples:

the basic outer coating (bottom coating) is a metal packaging conventional rubber roll coating mode, a model MC-UV-C504 product produced by the Brelin chemical industry Co., Ltd, in Fushan City is adopted, the product is subjected to traditional thermosetting at 170 ℃, and the coating film thickness is 15 g/square meter;

the printing layer is three-pass printing, and the following printing ink is respectively adopted:

1 PASS: UVLED red special + UVLED blue special;

2 PASS: UVLED red special + UVLED blue special;

3 PASS: UVLED6662-2 four-color red + UVLED4411-2 four-color blue + UVLED8018 black ink + UVLED yellow;

the UVLED red special ink, the UVLED blue special ink and the UVLED yellow special ink are prepared by UVLED series ink produced by Conlin chemical Co., Ltd, Fushan City; UVLED6662-2 four-color red and UVLED4411-2 four-color blue adopt UVLED series printing ink produced by Conlin chemical limited company of Fushan City, and the printing ink is irradiated and dried by using an LED-UV curing light source;

coating a bright oil layer by adopting a metal packaging conventional rubber roll coating mode, wherein the bright oil is HF-701H bright oil produced by the Breyns chemical Co., Ltd, in Fushan City, and is dried by a heating curing mode of baking a metal plate at 180 ℃ for 12 minutes, and the weight of a coated dry film is 9 g/square meter;

the special gloss effect is coated by adopting a metal packaging conventional rubber roller coating mode, the used coating is HK-1006FH and is produced by Conlin chemical Co., Ltd, in Fushan City, and the main component of the coating is unsaturated polyester resin, or the used coating is OP-0258MC and is produced by Changsheng chemical Co., Ltd, and the main component of the coating is epoxy resin; and quantitatively adding pearl powder or matte powder and shrinkage-reducing additive according to the special gloss effect requirement.

The following examples and comparative examples are illustrated with tinplate as the metal flat plate to be treated.

Example 1

A metal package printing and coating method with a special gloss effect is provided, the special gloss effect is a matte gloss effect, and the method comprises the following specific steps:

(1) carrying out foundation external coating on the tinplate by adopting a rubber roll coating mode, wherein the used coating is an MC-UV-C504 product produced by the Brelin chemical industry Co., Ltd, in the Fushan City, and is subjected to traditional thermosetting at 170 ℃, and the coating thickness is 15 g/square meter to form a foundation external coating;

(2) the coating used for the special gloss effect is OP-0258MC, matte powder which accounts for 10wt% of the weight of the coating is added into the coating before coating and is uniformly mixed, the special gloss effect outer coating is coated on the base outer coating by adopting a conventional full-page rubber roller coating mode, then the coating is cured at 200 ℃, and the film weight thickness is 8g/m²；

(3) Three image-text layers are printed on the special gloss effect coating, and the following printing inks are respectively adopted:

1 PASS: UVLED red special + UVLED blue special;

2 PASS: UVLED red special + UVLED blue special;

3 PASS: UVLED6662-2 four-color red + UVLED4411-2 four-color blue + UVLED8018 black ink + UVLED yellow;

the UVLED red special ink, the UVLED blue special ink and the UVLED yellow special ink are prepared by UVLED series ink produced by Conlin chemical Co., Ltd, Fushan City; UVLED6662-2 four-color red, UVLED4411-2 four-color blue adopt UVLED serial printing ink produced by Conlin chemical limited company of Fushan city, the printing ink adopts LED-UV curing light source to irradiate and dry;

(4) and coating a gloss oil layer on the printing layer, wherein the gloss oil is made of HF-701H gloss oil produced by the Brelin chemical Co., Ltd, in Fushan City, and drying the printing layer in a heating curing mode of baking a metal plate at the temperature of 180 ℃ for 12 minutes, wherein the weight of a coated dry film is 9 g/square meter.

Example 2

A metal package printing and coating method with a special gloss effect is provided, the special gloss effect is a pearl gloss effect, and the method comprises the following specific steps:

(1) carrying out foundation external coating on the tinplate by adopting a rubber roll coating mode, wherein the used coating is an MC-UV-C504 product produced by the Brelin chemical industry Co., Ltd, in the Fushan City, and is subjected to traditional thermosetting at 170 ℃, and the coating thickness is 15 g/square meter to form a foundation external coating;

(2) the paint with special gloss effect is HK-1006FH, pearlescent powder with the weight of 3 wt% of the paint is added into the paint before coating, the paint is coated on the base outer coating by adopting a conventional full-page rubber roller coating mode, then the paint is cured at 150 ℃, and the film weight thickness is 5g/m²；

(3) Three image-text layers are printed on the special gloss effect coating, and the following printing inks are respectively adopted:

1 PASS: UVLED red special + UVLED blue special;

2 PASS: UVLED red special + UVLED blue special;

3 PASS: UVLED6662-2 four-color red + UVLED4411-2 four-color blue + UVLED8018 black ink + UVLED yellow;

the UVLED red special ink, the UVLED blue special ink and the UVLED yellow special ink are prepared by UVLED series ink produced by Conlin chemical Co., Ltd, Fushan City; UVLED6662-2 four-color red, UVLED4411-2 four-color blue adopt UVLED serial printing ink produced by Conlin chemical limited company of Fushan city, the printing ink adopts LED-UV curing light source to irradiate and dry;

(4) and coating a gloss oil layer on the printing layer, wherein the gloss oil is made of HF-701H gloss oil produced by the Brelin chemical Co., Ltd, in Fushan City, and drying the printing layer in a heating curing mode of baking a metal plate at the temperature of 180 ℃ for 12 minutes, wherein the weight of a coated dry film is 9 g/square meter.

Example 3

The difference from example 1 is that in step (2), 1.5 wt% of calcium sulfate nano-whisker and 0.2 wt% of sodium dodecyl benzene sulfonate based on the weight of the paint are further added to the paint for special gloss effect.

Example 4

The difference from example 1 is that in step (2), nano titanium dioxide in an amount of 2.2wt% and sodium dodecylbenzenesulfonate in an amount of 0.5wt% based on the weight of the paint are further added to the paint for special gloss effect.

Example 5

The difference from the example 1 is that in the step (2), 1.6 wt% of secondary nano-vermiculite powder and 0.3 wt% of sodium dodecyl benzene sulfonate are further added into the coating used for the special gloss effect, wherein the secondary nano-vermiculite powder is obtained by the following processes:

taking nano vermiculite, wherein 63% of nano vermiculite by mass is kept at 800 ℃ for 2 hours, the rest nano vermiculite is kept at 150 ℃ for 2 hours, and then mixing the nano vermiculite and the rest nano vermiculite to obtain secondary nano vermiculite powder.

Example 6

The difference from the example 1 is that in the step (2), 1.8 wt% of secondary nano-vermiculite powder and 0.4 wt% of sodium dodecyl benzene sulfonate are further added into the coating used for the special gloss effect, wherein the secondary nano-vermiculite powder is obtained by the following processes:

taking nano vermiculite, wherein 50% of nano vermiculite by mass is kept at 750 ℃ for 8 hours, the rest nano vermiculite is kept at 145 ℃ for 5 hours, and then mixing the nano vermiculite and the nano vermiculite to obtain secondary nano vermiculite powder.

Example 7

The difference from example 1 is that, in step (2), 8wt% of polymethyl methacrylate based on the weight of the coating material is further added to the coating material for special gloss effect.

Comparative example 1

The difference from the embodiment 5 is that the nano vermiculite is used for replacing the secondary nano vermiculite.

Comparative example 2

The difference from the embodiment 5 is that the nano vermiculite subjected to heat preservation treatment at 750 ℃ for 2 hours is used for replacing the secondary nano vermiculite.

Comparative example 3

The nano-vermiculite after being heat-preserved for 2 hours at 750 ℃ is directly mixed with the rest nano-vermiculite to replace the secondary nano-vermiculite.

Performance testing

The following performance tests were performed on the coated tinplate pieces obtained in the steps (2), (3) and (4) corresponding to the above examples 1 to 7 and comparative examples 1 to 3, and the results are shown in Table 1:

1. surface hardness test: the surface hardness was measured using a Chinese-style pencil reference GB/T6739;

2. and (3) testing the adhesive force: the use of 3M #610 tape was made with reference to GB1720-1979, but without the need to grid or scribe a circle on the coating. The results are shown in Table 1.

3. Surface scratch resistance test: using a SHEEN hardness tester (minimum weight 100g), a 150X 100mm piece of the plate sample was placed on the flat base of the tester with the paint film side facing up and fixed, and the flat base was moved at a constant speed from left to right with the weight of the weight in grams being the paint film hardness standard with the weight of the weight not exposed as the result shown in Table 1.

TABLE 1 paint film Properties

Firstly, as can be seen from fig. 1, the print coating of the tinplate prepared by the method of the present invention not only shows a distinct matte gloss effect, but also the print coating is clear. As can be seen from FIG. 2, the metal plate prepared by the conventional method of the prior art, i.e., base coat-printing-special gloss effect-gloss oil layer, appears to be blurred due to the printed images and texts in the printed coating.

Secondly, the shrinkage-inhibiting substance is added into the coating for special gloss effect, so that the curing shrinkage of the special gloss effect layer can be effectively inhibited, the adhesive force of the special gloss effect layer and the printing coating is ensured, and the hardness of the gloss oil layer and the scratch-resistant hardness are improved to a certain degree.