阅读说明：本技术 一种可有效提升瓶装饮料包装阻光性能的标签及其制备、应用 (Label capable of effectively improving light resistance of bottled beverage package and preparation and application thereof ) 是由 徐雯 范伟明 王健 段绘叶 郭太松 印雄飞 于 2021-07-27 设计创作，主要内容包括：本发明涉及饮料封装技术领域,针对现有阻光标签阻光效果差的问题,公开了一种可有效提升瓶装饮料包装阻光性能的标签及其制备、应用,所述标签包括基底层和设于基底层背面的油墨层,所述油墨层厚度是基底层厚度的0.05-0.08倍,所述基底层为PETG阻光乳白热收缩膜,所述基底层的厚度≥20μm,所述油墨层为黑色。本发明通过制备能够分步固化的油墨来适应PETG阻光乳白热收缩膜的加热收缩过程,避免基底层和油墨层分离,另外通过调整油墨加入的组分,来增强油墨整体的耐热与耐摩擦性能,最终通过PETG阻光乳白热收缩膜和油墨层的配合最大限度地确保了整张标签整体的阻光性能。(The invention relates to the technical field of beverage packaging, and discloses a label capable of effectively improving the light-blocking performance of bottled beverage packaging aiming at the problem of poor light-blocking effect of the existing light-blocking label, and preparation and application thereof. The invention adapts to the heating shrinkage process of the PETG light-blocking milky-white heat-shrinkable film by preparing the printing ink capable of being cured step by step, avoids the separation of a substrate layer and an ink layer, enhances the heat resistance and the friction resistance of the whole printing ink by adjusting the components added into the printing ink, and finally ensures the whole light-blocking performance of the whole label to the maximum extent by matching the PETG light-blocking milky-white heat-shrinkable film and the ink layer.)

1. The label capable of effectively improving the light-blocking performance of bottled beverage packages is characterized by comprising a base layer and an ink layer arranged on the back of the base layer, wherein the thickness of the ink layer is 0.05-0.08 times that of the base layer.

2. The label capable of effectively improving the light blocking performance of bottled beverage packages according to claim 1, wherein the base layer is a PETG light blocking milky-white heat shrinkable film, the thickness of the base layer is more than or equal to 20 μm, and the ink layer is black.

3. The label capable of effectively improving the light-blocking performance of bottled beverage packages according to claim 1 or 2, wherein the width d of the lap joint area at the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is m, the exposed white width of the palm portion is more than or equal to 4.5mm and less than or equal to 6mm, and the width m is more than or equal to 6mm and less than or equal to 8 mm.

4. The label of claim 3, wherein the ink layer is formed by curing and drying an ink, and the ink comprises, by weight: 40-50 parts of framework main material, 20-25 parts of methacrylamide, 15-20 parts of vinylene carbonate, 1-1.5 parts of 2-isopropyl thioxanthone, 2-4 parts of benzoyl peroxide, 8-12 parts of modified talcum powder, 15-18 parts of modified copper chrome black, 8-10 parts of 2, 6-di-tert-butyl cresol, 6-8 parts of polydimethylsiloxane and 70-80 parts of n-butyl alcohol.

5. The label of claim 4, wherein the main material of the frame is poly (divinylbenzene-dihydroxyethylene), and the preparation process comprises: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 60-70 ℃, reacting for 1-1.2h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.4-1.6: 0.4-0.6.

6. The label of claim 4, wherein the modified talc is prepared by the steps of: dissolving polyacrylamide in ethanol, adding talcum powder, stirring, dropwise adding azodiisobutyronitrile, heating to 60-70 deg.C, ultrasonic treating for 40-50min, filtering, washing, and drying to obtain the final product; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1-1.4: 0.2-0.4.

7. The label of claim 4, wherein the modified copper chrome black is prepared by the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 45-55 deg.C, performing ultrasonic treatment for 45-60min, filtering, washing, and drying to obtain the final product; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 1.5-2.

8. A method for preparing a label effective for improving the light-blocking performance of a bottled beverage package according to any one of claims 3 to 7, comprising the steps of:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches more than 50 mu m;

(2) printing: coating the ink on the engraved black plate roller at a certain temperature and humidity, and printing the ink on a PETG light-blocking milky-white heat shrinkable film in a pulling motion;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a drying system to obtain the label.

9. The method as set forth in claim 8, wherein the ambient temperature is 23. + -. 2 ℃, the ambient relative humidity is 60-70%, the drying temperature is 50. + -. 10 ℃, and the drawing speed is 400 m/min.

10. Use of a label according to any of claims 3-7 for application to the outside of a container bottle, characterized in that the application process is:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 40-50min by adopting solvent steam with the temperature of 95-100 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: 1-1.2, finally obtaining the container bottle with the label attached to the outer side.

Technical Field

The invention relates to the technical field of beverage packaging, in particular to a label capable of effectively improving light resistance of bottled beverage packaging, and preparation and application thereof.

Background

The light-resistant black and white film label adopts a multilayer extrusion-blowing technology, has white outer layer and black inner layer, is uniform in color and has better light resistance, but the specification of the light-resistant black and white film is single, only the film material with high shrinkage rate (more than 70 percent) is available at present, and for bottled products, the quality problems such as label wrinkles, flanging and the like easily occur on the products with low shrinkage ratio requirements; and the black and white film label is high in price which is 1.5 times of the price of the common white film label. The method reduces the light penetrating through the label by printing the solid black ink on the back of the white film label in a full-page mode and utilizing the high light absorption of the black ink so as to achieve the purpose of light blocking. Compared with a black and white film, the black coating is to wrap carbon black in a film material, the method prints the whole black ink in the white film, and covers the carbon black on the inner surface of the label, and the two methods can both play a role in delaying the oxidation of common vitamins in the beverage. The white film has high shrinkage and medium shrinkage, and films with different shrinkage ratios can be selected according to the specific bottle type labeling requirements by printing the black label on the white film, so that the practical production has higher adaptability. The black ink is printed in the white film label, the plate making is simple, the operability and the adaptability are stronger, but the cost is only 70 percent of that of the black and white film label.

Patent No. CN201820301822.7, patent name: a notebook surface decoration film. The utility model provides a notebook surface decorative film, including superimposed base film layer, peel off layer, sense of touch functional layer, chromatograph and adhesive layer in proper order, the sense of touch functional layer includes the flexible mould pressing layer formed by coating, the light blocking layer formed by printing ink, extinction polyester layer, radiation protection layer and pattern layer, and wherein flexible mould pressing layer and light blocking layer are located the coplanar to superpose in proper order with extinction polyester layer, radiation protection layer and pattern layer. The utility model discloses a decorative film can make final glossiness no longer influenced by the glossiness of basic rete, and any surface texture and glossiness are become in the design of freedom for peel force when moulding plastics can be regulated and control.

The defects of the above patent are that the wetting ability of the ink layer to the base film layer and the light-blocking effect thereof are not fully considered, which results in the reduction of the final coating combining ability and light-blocking ability of the decorative film.

Disclosure of Invention

The invention aims to overcome the problem of poor light-blocking effect of the existing light-blocking label, and provides a label capable of effectively improving the light-blocking performance of bottled beverage packaging, and preparation and application thereof.

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

the label comprises a base layer and an ink layer arranged on the back of the base layer, wherein the thickness of the ink layer is 0.05-0.08 times that of the base layer.

Preferably, the base layer is a PETG light-blocking milky-white heat-shrinkable film, the thickness of the base layer is more than or equal to 20 microns, and the ink layer is black.

Compared with a black coated light-blocking label, the light-blocking label prepared by the invention has the advantages of low cost, better whiteness than a black and white film after labeling and shrinking, easy control of actual production quality and better appearance effect; compared with other light-blocking bottles, the light-blocking bottle has the advantages of no equipment cost, no limitation on production efficiency and bottle-making forming process, low cost on the premise of the same light-blocking property, good appearance effect and higher replacement flexibility. Only when the thickness is matched, the light-blocking efficiency, the friction resistance and the heat resistance of the label can be optimal, and the decomposition of nutrient components in the beverage bottle can be prevented to the maximum extent.

Preferably, the width d of the lap joint area at the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is m, the exposed white width of the palm-closed part is more than or equal to 4.5mm and less than or equal to 6mm, and the exposed white width of the palm-closed part is more than or equal to 6mm and less than or equal to 8 mm.

Preferably, the ink layer is obtained by curing and drying ink, and the ink comprises the following components in parts by weight: 40-50 parts of framework main material, 20-25 parts of methacrylamide, 15-20 parts of vinylene carbonate, 1-1.5 parts of 2-isopropyl thioxanthone, 2-4 parts of benzoyl peroxide, 8-12 parts of modified talcum powder, 15-18 parts of modified copper chrome black, 8-10 parts of 2, 6-di-tert-butyl cresol, 6-8 parts of polydimethylsiloxane and 70-80 parts of n-butyl alcohol.

Preferably, the skeleton main body material is polydivinylbenzene-dihydroxyethylene, and the preparation process comprises the following steps: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 60-70 ℃, reacting for 1-1.2h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.4-1.6: 0.4-0.6.

The above-mentioned additive components of the present invention have the following interaction principles: (1) the molecular structure of the skeleton main material influences the hardness and the friction resistance of the ink layer, polydivinylbenzene-dihydroxyethylene is used as the skeleton main material, so that benzene rings are arranged in the main chain of the skeleton main material at intervals, the friction resistance and the heat resistance of the whole ink material can be improved, meanwhile, the main chain contains imino groups, and the branched chains on two sides contain hydroxyl groups and carbonyl groups, which can provide polymerization active sites for added polymerization monomers or crosslinking, so that the finally formed macromolecular polymer is spread in a form of densely paving around the main chain of the skeleton main material, the finally formed ink film layer has higher stability and stronger complexing ability for added components, the added components are not easy to separate out, and the friction resistance is stronger;

(2) methacrylamide as a first polymeric monomer and vinylene carbonate as a second polymeric monomer; the two monomers are matched with each other, and methacrylamide with good fluidity and vinylene carbonate with ring shape are selected to be polymerized with a skeleton main body material, so that on one hand, the fluidity of the whole printing ink can be improved, and on the other hand, the friction resistance and the heat resistance of the printing ink can be improved;

(3) 2-isopropyl thioxanthone as a first initiator (photoinitiator) and benzoyl peroxide as a second initiator (thermal curing initiator); 2-isopropyl thioxanthone (insufficient photoinitiator) initiates partial added components to perform preliminary cross-linking reaction under the action of light, benzoyl peroxide initiates complete curing reaction of the rest added components under the heating condition so as to adapt to the heating shrinkage effect of the PETG light-blocking milky-white heat shrinkable film and ensure the integrity of the label;

(4) the modified talcum powder is used as a filler, and the modified copper chromium black is used as an ink coloring pigment; 2, 6-di-tert-butyl cresol as a stabilizer, polydimethylsiloxane as a flatting agent and n-butyl alcohol as a solvent; by adding the components, the overall stability of the ink liquid before curing and the thermal stability and heat resistance of the ink film layer after curing are better ensured.

Preferably, the preparation process of the modified talcum powder comprises the following steps: dissolving polyacrylamide in ethanol, adding talcum powder, stirring, dropwise adding azodiisobutyronitrile, heating to 60-70 deg.C, ultrasonic treating for 40-50min, filtering, washing, and drying to obtain the final product; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1-1.4: 0.2-0.4.

Preferably, the preparation process of the modified copper-chromium black comprises the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 45-55 deg.C, performing ultrasonic treatment for 45-60min, filtering, washing, and drying to obtain the final product; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 1.5-2.

The talcum powder and the copper-chromium black are insoluble solid addition components, and are powdery, so that the talcum powder and the copper-chromium black are easy to agglomerate and easily separate from a crosslinked macromolecular polymer after being added into the ink component, the service life of an ink film layer is influenced, and the wear resistance of the ink film layer is reduced; therefore, the modified talcum powder and the modified copper-chromium black are added, the modified talcum powder is subjected to graft modification by adopting a cationic dispersant polyacrylamide, and the modified copper-chromium black is modified by adopting an anionic dispersant diisooctyl succinate sodium sulfonate, so that the modified talcum powder can generate repulsion force due to the fact that the surface of the modified talcum powder carries cations and is not easy to agglomerate, the modified copper-chromium black can generate repulsion force due to the fact that the surface of the modified copper-chromium black carries anions and is not easy to agglomerate, the modified talcum powder and the modified copper-chromium black can generate mutual attraction due to the fact that the surface of the modified talcum powder carries heterogeneous charges, and finally the two components are beneficial to uniform dispersion in printing ink. In addition, the polyacrylamide is grafted on the surface of the talcum powder, and the diisooctyl succinate sodium sulfonate is attached to the surface of the copper chromium black, so that the polyacrylamide and the diisooctyl succinate sodium sulfonate can participate in reaction in the crosslinking and curing process, and are effectively connected with crosslinking macromolecules, a good binding effect is achieved on the talcum powder and the copper chromium black, and the quality of the ink layer is further improved.

The preparation method of the label capable of effectively improving the light-blocking performance of the bottled beverage package comprises the following preparation steps:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches more than 50 mu m;

(2) printing: coating the ink on the engraved black plate roller at a certain temperature and humidity, and printing the ink on a PETG light-blocking milky-white heat shrinkable film in a pulling motion;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a drying system to obtain the label.

Preferably, the ambient temperature is 23 + -2 deg.C, the ambient relative humidity is 60-70%, the drying temperature is 50 + -10 deg.C, and the drawing speed is 250-400 m/min.

In the preparation process of the label, the added components in the printing ink are promoted to be partially cured under the action of illumination and a photoinitiator, namely, the pre-curing is carried out, so that the stability of the shape of the printing ink layer is ensured, the printing ink layer is dried in a drying system, and the label is prevented from being damaged in the laminating process.

The label is applied to the outer side of the attached container bottle, and the application process is as follows:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 40-50min by adopting solvent steam with the temperature of 95-100 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: 1-1.2, finally obtaining the container bottle with the label attached to the outer side.

In the application process, the heating is carried out in a solvent steam heating mode, solvent molecules can penetrate into the ink layer again to dissolve uncured components, the thermal curing agent in the dried partially cured ink layer is initiated within the range of 95-100 ℃, the components to be cured are continuously cured, and finally the complete curing of the ink film layer is realized.

Therefore, the invention has the following beneficial effects:

(1) the heating shrinkage process of the PETG light-blocking milky-white heat shrinkable film is adapted by preparing the printing ink capable of being cured step by step, the separation of a substrate layer and an ink layer is avoided, in addition, the heat resistance and the friction resistance of the whole printing ink are enhanced by adjusting the components added into the printing ink, and finally, the whole light-blocking performance of the whole label is ensured to the maximum extent through the matching of the PETG light-blocking milky-white heat shrinkable film and the ink layer;

(2) according to the invention, through adjustment and control of each added component of the printing ink, the label with good attaching effect, strong light-blocking performance, good wear resistance and long service life can be prepared only by two steps of curing through photocuring and thermocuring.

Detailed Description

The invention is further described with reference to specific embodiments.

General examples

The label comprises a base layer and an ink layer arranged on the back of the base layer, wherein the thickness of the ink layer is 0.05-0.08 times that of the base layer. The base layer is a PETG light-blocking milky-white heat shrinkable film, the thickness of the base layer is more than or equal to 20 mu m, and the ink layer is black. The width d of the lap joint area at the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is m, the d is more than or equal to 4.5mm and less than or equal to 6mm, and the m is more than or equal to 6mm and less than or equal to 8 mm.

The ink layer is formed by curing and drying ink, and the ink comprises the following components in parts by weight: 40-50 parts of framework main material, 20-25 parts of methacrylamide, 15-20 parts of vinylene carbonate, 1-1.5 parts of 2-isopropyl thioxanthone, 2-4 parts of benzoyl peroxide, 8-12 parts of modified talcum powder, 15-18 parts of modified copper chrome black, 8-10 parts of 2, 6-di-tert-butyl cresol, 6-8 parts of polydimethylsiloxane and 70-80 parts of n-butyl alcohol.

The skeleton main body material is polydivinylbenzene-dihydroxy ethylene, and the preparation process comprises the following steps: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 60-70 ℃, reacting for 1-1.2h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.4-1.6: 0.4-0.6.

The preparation process of the modified talcum powder comprises the following steps: dissolving polyacrylamide in ethanol, adding talcum powder, stirring, dropwise adding azodiisobutyronitrile, heating to 60-70 deg.C, ultrasonic treating for 40-50min, filtering, washing, and drying to obtain the final product; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1-1.4: 0.2-0.4.

The preparation process of the modified copper-chromium black comprises the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 45-55 deg.C, performing ultrasonic treatment for 45-60min, filtering, washing, and drying to obtain the final product; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 1.5-2.

The preparation method of the label capable of effectively improving the light-blocking performance of the bottled beverage package comprises the following preparation steps:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches more than 50 mu m;

(2) printing: coating the ink on the engraved black plate roller under the conditions that the environmental temperature is 23 +/-2 ℃ and the environmental relative humidity is 60-70%, and then printing the ink on the PETG light-blocking milky-white heat-shrinkable film with the drawing speed of 250-400 m/min;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a drying system at 50 +/-10 ℃ to obtain the label.

The label is applied to the outer side of the attached container bottle, and the application process is as follows:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 40-50min by adopting solvent steam with the temperature of 95-100 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: 1-1.2, finally obtaining the container bottle with the label attached to the outer side.

Example 1

The utility model provides a can effectively promote bottled drink packing light blocking performance's label, the label includes the stratum basale and locates the printing ink layer at the stratum basale back, the printing ink layer thickness is 0.065 times of stratum basale thickness. The base layer is a PETG light-blocking milky-white heat shrinkable film, the thickness of the base layer is 30 mu m, and the ink layer is black. The width d of the lapping area of the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is 5.2mm, and the exposed white width m of the palm-closed part is 7 mm.

The ink layer is formed by curing and drying ink, and the ink comprises the following components in parts by weight: 45 parts of framework main material, 22 parts of methacrylamide, 18 parts of vinylene carbonate, 1.3 parts of 2-isopropyl thioxanthone, 3 parts of benzoyl peroxide, 10 parts of modified talcum powder, 16.5 parts of modified copper chrome black, 9 parts of 2, 6-di-tert-butyl cresol, 7 parts of polydimethylsiloxane and 75 parts of n-butyl alcohol.

The skeleton main body material is polydivinylbenzene-dihydroxy ethylene, and the preparation process comprises the following steps: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 65 ℃, reacting for 1.1h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.5: 0.5.

the preparation process of the modified talcum powder comprises the following steps: dissolving polyacrylamide in ethanol, adding talcum powder, stirring uniformly, dropwise adding azodiisobutyronitrile, heating to 65 ℃, performing ultrasonic treatment for 45min, filtering, washing and drying to obtain the polyacrylamide gel; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1.2: 0.3.

the preparation process of the modified copper-chromium black comprises the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 50 ℃, performing ultrasound treatment for 52min, filtering, washing and drying to obtain the sodium diisooctyl succinate sulfonate; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 1.8.

the preparation method of the label capable of effectively improving the light-blocking performance of the bottled beverage package comprises the following preparation steps:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches 50 mu m;

(2) printing: under the conditions that the environmental temperature is 23 ℃ and the environmental relative humidity is 65%, coating the printing ink on the engraved black plate roller, and printing the printing ink on a PETG light-blocking milky-white heat shrinkable film with the drawing speed of 320 m/min;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a 50 ℃ drying system to obtain the label.

The label is applied to the outer side of the attached container bottle, and the application process is as follows:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 45min by adopting solvent steam at the temperature of 98 ℃, wherein the volume ratio of the n-propanol to the deionized water in the solvent components is 2: 1.1, finally obtaining the container bottle with the label attached to the outer side.

Example 2

The utility model provides a can effectively promote bottled drink packing light blocking performance's label, the label includes the stratum basale and locates the printing ink layer at the stratum basale back, the printing ink layer thickness is 0.05 times of stratum basale thickness. The base layer is a PETG light-blocking milky-white heat shrinkable film, the thickness of the base layer is 30 mu m, and the ink layer is black. The width d of the lap joint area at the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is 4.5mm, and the exposed white width m of the palm-closed part is 6 mm.

The ink layer is formed by curing and drying ink, and the ink comprises the following components in parts by weight: 40 parts of framework main material, 20 parts of methacrylamide, 15 parts of vinylene carbonate, 1 part of 2-isopropyl thioxanthone, 2 parts of benzoyl peroxide, 8 parts of modified talcum powder, 15 parts of modified copper chrome black, 8 parts of 2, 6-di-tert-butyl cresol, 6 parts of polydimethylsiloxane and 70 parts of n-butyl alcohol.

The skeleton main body material is polydivinylbenzene-dihydroxy ethylene, and the preparation process comprises the following steps: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 60 ℃, reacting for 1h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.4: 0.4.

the preparation process of the modified talcum powder comprises the following steps: dissolving polyacrylamide in ethanol, adding talcum powder, stirring uniformly, dropwise adding azodiisobutyronitrile, heating to 60 ℃, performing ultrasonic treatment for 40min, filtering, washing and drying to obtain the polyacrylamide gel; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1: 0.2.

the preparation process of the modified copper-chromium black comprises the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 45 ℃, performing ultrasonic treatment for 45min, filtering, washing and drying to obtain the sodium diisooctyl succinate sulfonate; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 1.5.

the preparation method of the label capable of effectively improving the light-blocking performance of the bottled beverage package comprises the following preparation steps:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches 55 mu m;

(2) printing: under the conditions that the environmental temperature is 21 ℃ and the environmental relative humidity is 60%, coating the printing ink on the engraved black plate roller, and printing the printing ink on a PETG light-blocking milky-white heat shrinkable film with the drawing speed of 250 m/min;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a drying system at 40 ℃ to obtain the label.

The label is applied to the outer side of the attached container bottle, and the application process is as follows:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 40min by adopting solvent steam with the temperature of 95 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: and 1, finally obtaining the container bottle with the label adhered to the outer side.

Example 3

The label comprises a base layer and an ink layer arranged on the back of the base layer, wherein the thickness of the ink layer is 0.08 times that of the base layer. The base layer is a PETG light-blocking milky-white heat shrinkable film, the thickness of the base layer is 30 mu m, and the ink layer is black. The width d of the lapping area of the opposite side of the PETG light-blocking milky-white heat shrinkable film, which is not coated with the ink layer, is 6mm, and the exposed white width m of the palm-closed part is 8 mm.

The ink layer is formed by curing and drying ink, and the ink comprises the following components in parts by weight: 50 parts of a framework main material, 25 parts of methacrylamide, 20 parts of vinylene carbonate, 1.5 parts of 2-isopropyl thioxanthone, 4 parts of benzoyl peroxide, 12 parts of modified talcum powder, 18 parts of modified copper chrome black, 10 parts of 2, 6-di-tert-butyl cresol, 8 parts of polydimethylsiloxane and 80 parts of n-butyl alcohol.

The skeleton main body material is polydivinylbenzene-dihydroxy ethylene, and the preparation process comprises the following steps: dissolving divinylbenzene in cyclohexane, adding dihydroxyethylene, stirring uniformly, dripping lauroyl peroxide, heating to 70 ℃, reacting for 1.2h, and purifying by a chromatographic column to obtain the product; the mass ratio of divinylbenzene, dihydroxyethylene and lauroyl peroxide is 2: 1.6: 0.6.

the preparation process of the modified talcum powder comprises the following steps: dissolving polyacrylamide in ethanol, adding talcum powder, stirring, dropwise adding azodiisobutyronitrile, heating to 70 ℃, performing ultrasonic treatment for 50min, filtering, washing and drying to obtain the polyacrylamide gel; the mass ratio of polyacrylamide to talcum powder to azobisisobutyronitrile is 1: 1.4: 0.4.

the preparation process of the modified copper-chromium black comprises the following steps: dissolving sodium diisooctyl succinate sulfonate in diethyl ether, adding copper-chromium black powder, heating to 55 ℃, performing ultrasonic treatment for 60min, filtering, washing and drying to obtain the sodium diisooctyl succinate sulfonate; the mass ratio of the diisooctyl succinate sodium sulfonate to the copper chromium black powder is 1: 2.

the preparation method of the label capable of effectively improving the light-blocking performance of the bottled beverage package comprises the following preparation steps:

(1) plate making: laser engraving the black printing roller by laser, wherein the engraving depth of the black printing roller reaches 65 mu m;

(2) printing: under the conditions that the environmental temperature is 25 ℃ and the environmental relative humidity is 70 percent, coating the printing ink on the engraved black plate roller, and printing the printing ink on a PETG light-blocking milky-white heat shrinkable film with the drawing speed of 400 m/min;

(3) and (3) drying: and drying the printed PETG light-blocking milky-white heat shrinkable film by a 60 ℃ drying system to obtain the label.

The label is applied to the outer side of the attached container bottle, and the application process is as follows:

a. attaching: wrapping the label around the outer side of the container bottle, and gluing and combining the opposite side overlapping area;

b. heating and shrinking: heating the label for 50min by using solvent steam with the temperature of 100 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: and 1.2, finally obtaining the container bottle with the label attached to the outer side.

Comparative example 1

The difference from example 1 is that the ink layer is not coated, and the rest of the steps are the same as example 1.

Comparative example 2

The difference from example 1 was that a general ink (debao DP3080) was applied, and the rest of the procedure was the same as in example 1.

Comparative example 3

The difference from example 1 is that the labeling step was not performed, i.e., the "b, heat shrinkage: heating the label for 65min by adopting solvent steam at the temperature of 98 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: 1.1 finally obtaining a container bottle with a label attached to the outer side ", and the rest of the steps are the same as those of the example 1.

For the above examples and comparative examples, the light transmittance, the anti-dropping and scratching capabilities of the ink, and the degradation rate of vitamin A after 15 days of illumination under the shielding of the label were respectively measured.

Table 1 evaluation of the light blocking Performance of labels prepared according to the items

Item	Light transmittance (%)	Ink dropout and scratch area ratio (%)	Degradation rate of vitamin A
				Example 1	0.27	99.2	7％
Example 2	0.28	99.4	6.8％
				Example 3	0.25	99.1	6.9％
Comparative example 1	13.9	-	60％
				Comparative example 2	7.6	80	25％
Comparative example 3	8.2	50	40％

And (4) conclusion: examples 1-3 all provide the label and ink layer prepared by the present invention, through the mutual cooperation of the PETG light-blocking opal heat shrinkable film and the ink layer, the light-blocking efficiency and the friction resistance of the label can be optimized, and the decomposition of the nutritional ingredients in the beverage bottle can be prevented to the maximum extent.

Comparative example 1 is different from example 1 in that the ink layer is not coated, and the rest steps are the same as example 1; in order to coat an ink layer, the label only has a PETG light-blocking milky heat-shrinkable film layer, only plays a role in reflecting light, and has poor light-blocking performance, so that related performance parameters are reduced.

Comparative example 2 is different from example 1 in that a general ink (debao DP3080) was coated and the remaining steps were the same as example 1; when the common ink is coated, the ink can be dried and cured at one time, the ink layer can not be shrunk in the process of marking the PETG light-blocking milky-white heat-shrinkable film, the ink layer and the PETG light-blocking milky-white heat-shrinkable film are layered, the comprehensive performance of the PETG light-blocking milky-white heat-shrinkable film is reduced, and in addition, the common ink does not contain a benzene ring macromolecular main chain structure and a cyclic polymerization monomer, so the friction resistance and the light-blocking performance of the common ink are poor.

Comparative example 3 differs from example 1 in that the labeling step was not performed, i.e., the "b, heat shrinkage: heating the label for 50min by adopting solvent steam at 98 ℃, wherein the volume ratio of n-propanol to deionized water in the solvent components is 2: 1.1, finally obtaining a container bottle with a label attached to the outer side, wherein the rest steps are the same as those of the example 1; only part of the components of the ink layer are subjected to photocuring, and the rest of the components are cured and in a dry state, so that the overall density and hardness of the ink layer are low, and the light resistance and wear resistance of the ink layer are reduced.

It can be seen from the data of examples 1 to 3 and comparative examples 1 to 3 that the above requirements can be satisfied in all aspects only by the scheme within the scope of the claims of the present invention, and an optimized scheme can be obtained, and an optimal light-blocking label can be obtained. The change of the mixture ratio, the replacement/addition/subtraction of raw materials or the change of the feeding sequence can bring corresponding negative effects.

The raw materials and equipment used in the invention are common raw materials and equipment in the field if not specified; the methods used in the present invention are conventional in the art unless otherwise specified.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and all simple modifications, alterations and equivalents of the above embodiments according to the technical spirit of the present invention are still within the protection scope of the technical solution of the present invention.