A thermal surface material capable of improving label printing clarity and a preparation method thereof

Abstract

The present invention relates to a thermal surface material capable of improving label printing clarity and a preparation method thereof. The thermal surface material comprises, from top to bottom, a thermal layer, a composite coating, a base layer, a waterproof layer, and an adhesive layer. A first adhesive layer is disposed between the composite coating and the thermal layer, and a second adhesive layer is disposed between the composite coating and the base layer. A composite coating is disposed between the thermal layer and the base layer. The composite coating comprises a fiber layer, a nano-aluminum oxide powder layer disposed within the fiber layer, and a nano-calcium carbonate coating. The nano-aluminum oxide powder layer and the nano-calcium carbonate coating have a porosity exceeding 75%, while the fiber layer has a porosity exceeding 80%. When printing large amounts of ink, the ink is rapidly absorbed into the aluminum oxide powder layer, the nano-calcium carbonate coating, and the fiber layer, enabling label printing to maintain extremely high image clarity.

Description

Technical Field

[0001] The present invention relates to the technical field of labels, in particular to a heat-sensitive surface material capable of improving the clarity of label printing and a preparation method thereof. Background Art

[0002] As early as 1700, Europe printed the first batch of labels for use on medicines and cloth as commodity identification. Therefore, today's labels are used to mark product targets and categories or contents, like providing keywords to identify targets, making it easier for people to find and locate their targets. Most of the labels referred to in the printing industry are printed materials used to identify the relevant instructions of their own products, and most of them have self-adhesive adhesive on the back. However, there are also some that are not adhesive when printed, which can also be called labels. Labels with adhesive are commonly known as "self-adhesive labels." Regarding the labeling issue after instrument calibration, this is a label uniformly stipulated by the state (or one's own provincial regulations). The label can clearly indicate the details of the instrument after calibration.

[0003] Existing technologies, such as Chinese patent publication number CN101896955B, disclose a label that provides a heat-shrinkable polyester film with excellent seam sealing properties, high productivity, and resistance to longitudinal tearing during printing and other processing. The label is formed from this heat-shrinkable film and exhibits excellent tear resistance. The label is cut to fit the packaging object and heat-shrunk into a ring-shaped body bonded to both ends in the film's width, thereby covering at least a portion of the outer periphery of the packaging object. The label exhibits a right-angle tear strength in a direction perpendicular to the principal shrinkage direction (film longitudinal direction) of 100 N / mm to 310 N / mm, and a tensile strength in a direction perpendicular to the principal shrinkage direction (film longitudinal direction) of 50 MPa to 300 MPa.

[0004] The aforementioned existing technical solutions have the following drawbacks: Although these labels have excellent sealing and tear resistance, they, like most labels on the market, are made of thermal paper. Some companies use thermal paper as label paper during production, and use label printers to print QR codes and product information on the labels. However, existing label paper suffers from unclear printing, making it difficult for consumers to accurately read the product information on the label. Therefore, there is an urgent need for a thermal surface material that can improve label printing clarity. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a thermal surface material and a preparation method thereof that can improve the clarity of label printing. By changing the raw materials, the clarity of label printing can be effectively improved so that the label can accurately display the information on the product.

[0006] The above-mentioned object of the present invention is achieved through the following technical solutions:

[0007] A heat-sensitive surface material capable of improving the clarity of label printing comprises, from top to bottom, a heat-sensitive layer, a composite coating, a base color layer, a waterproof layer and an adhesive layer, a first adhesive layer being arranged between the composite coating and the heat-sensitive layer, and a second adhesive layer being arranged between the composite coating and the base color layer.

[0008] In a preferred example, the present invention can be further configured as follows: the composite coating includes a fiber layer and a nano-aluminum oxide powder layer and a nano-calcium carbonate coating arranged in the fiber layer, and an isolation layer is provided between the nano-aluminum oxide powder layer and the nano-calcium carbonate coating.

[0009] In a preferred example, the present invention can be further configured as follows: the isolation layer includes the following components: natural rosin modified resin, terpene resin, cyclohexane oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and anti-fogging agent.

[0010] In a preferred example, the present invention can be further configured as follows: the isolation layer includes the following components in parts by weight: 10-20 parts of natural rosin modified resin, 20-40 parts of terpene resin, 5-10 parts of cyclohexane oil, 3-5 parts of compatibilizer, 2-10 parts of softener, 5-8 parts of graphene, 0.5-1.0 parts of silane coupling agent, 0.1-0.5 parts of antioxidant, 0.1-0.5 parts of lubricant, and 0.3-0.7 parts of anti-fog agent.

[0011] In a preferred example, the present invention can be further configured as follows: the thickness of the nano-scale aluminum oxide powder layer is 20-35 g / m2, and the thickness of the nano-scale calcium carbonate coating is 10-20 g / m2.

[0012] In a preferred example, the present invention can be further configured as follows: the fiber layer is formed by compounding plant fiber and animal fiber, the fiber width of the fiber layer is 0.006-0.008 mm, the aspect ratio of the fiber is greater than or equal to 5:2, and the density of the heat-sensitive surface material is 1.21-1.64 g / cm3.

[0013] In a preferred example, the present invention can be further configured as follows: the heat-sensitive layer comprises the following components in parts by weight: 10-20 parts of a developer, 0.2-0.5 parts of a dispersant, 5-10 parts of 1,2-diphenoxyethane, 8-12 parts of zinc stearate, 10-20 parts of a sensitizer, 10-34 parts of diatomaceous earth, 6-10 parts of an adhesive, 5-8 parts of a phenolic resin, 3-9 parts of methyl benzoate, 30-40 parts of water, 4-8 parts of a colorless dye, 1-5 parts of polyvinyl alcohol, 1-4 parts of a lubricant, and 1-2 parts of a water-retaining agent.

[0014] In a preferred example, the present invention can be further configured as follows: the first adhesive layer and the second adhesive layer are both adhesive layers made of hot melt adhesive, water adhesive or solvent adhesive, and the base color layer is made of the following raw materials in parts by weight: 0.1-0.5 parts of dispersant, 5-10 parts of calcined kaolin, 2-6 parts of 4,4'-dihydroxydiphenyl sulfone, 5-8 parts of zinc stearate emulsion, 0.5-0.8 parts of cast polypropylene, and 0.1-0.5 parts of defoaming agent.

[0015] In a preferred example, the present invention can be further configured as follows: the waterproof layer is one of a laminated film, a polyethylene film, a polypropylene film or a polyester film.

[0016] A method for preparing the above-mentioned thermal surface material capable of improving label printing clarity comprises the following steps:

[0017] S1. Preparation of heat-sensitive layer: 1,2-diphenoxyethane, zinc stearate, sensitizer, diatomaceous earth, and water were mixed uniformly in proportion to obtain a mixed solution 1;

[0018] Then, the adhesive, the colorless dye, the polyvinyl alcohol, the lubricant, the water-retaining agent, the color developer, and the dispersant are mixed uniformly in proportion to obtain a mixed solution 2;

[0019] Mix the mixture 1 and the mixture 2, add phenolic resin and methyl benzoate in proportion, and stir evenly to obtain a heat-sensitive emulsion.

[0020] S2. Preparation of a composite coating: mixing a natural rosin-modified resin, a terpene resin, a naphthenic oil, a compatibilizer, a softener, graphene, a silane coupling agent, an antioxidant, a lubricant, and an antifogging agent in proportion to obtain an isolation emulsion, uniformly coating the isolation emulsion on the nano-aluminum oxide powder layer, and then covering the isolation emulsion with the nano-calcium carbonate coating to obtain a composite coating;

[0021] S3. Preparation of base color layer: Dispersant, calcined kaolin, 4,4'-dihydroxydiphenyl sulfone, zinc stearate emulsion, cast polypropylene, and defoamer are mixed uniformly in proportion to form a base color emulsion, and a waterproof layer is covered on the adhesive layer, and the base color emulsion is evenly coated on the waterproof layer;

[0022] S4. Preparation of thermal surface material: Cover the composite coating prepared in step S2 on the base color layer, and then cover the thermal layer prepared in step S1 on the nano-scale aluminum oxide powder layer of the composite coating to obtain a thermal surface material that can improve the clarity of label printing.

[0023] In summary, the present invention includes at least one of the following beneficial technical effects:

[0024] The present invention discloses a thermal surface material capable of improving the clarity of label printing and a preparation method thereof. A composite coating is provided between a thermal layer and a base color layer. The composite coating is composed of a fiber layer and a nano-aluminum oxide powder layer and a nano-calcium carbonate coating provided within the fiber layer. The porosity of the nano-aluminum oxide powder layer and the nano-calcium carbonate coating is as high as over 75%, and the porosity of the fiber layer is as high as over 80%. When a large amount of ink is printed, the ink is quickly absorbed into the aluminum oxide powder layer, the nano-calcium carbonate coating and the fiber layer, so that the printed label can maintain extremely high image clarity.

[0025] Furthermore, due to the high porosity of the fiber layer, the nano-scale calcium carbonate coating and nano-scale aluminum oxide powder layer can be well hidden within the fiber layer, making the fiber layer more substantial and increasing the toughness and elasticity of the label. When the label is bent, the printed content is not easily affected, effectively solving the problems of label curling and bubbling when exposed to water. This has an unexpected effect, a high degree of innovation, and great economic promotion value. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a cross-sectional view showing the heat-sensitive surface material of the present invention.

[0027] Figure 2 The schematic diagram of the structure of the composite coating of the present invention is shown.

[0028] Figure numerals: 1. heat-sensitive layer; 2. composite coating; 21. fiber layer; 22. nano-aluminum oxide powder layer; 23. nano-calcium carbonate coating; 24. isolation layer; 3. base color layer; 4. waterproof layer; 5. adhesive layer. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application; it is obvious that the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0030] Example 1:

[0031] A heat-sensitive surface material capable of improving the clarity of label printing comprises, from top to bottom, a heat-sensitive layer 1, a composite coating 2, a base color layer 3, a waterproof layer 4, and an adhesive layer 5. A first adhesive layer is provided between the composite coating 2 and the heat-sensitive layer 1, and a second adhesive layer is provided between the composite coating 2 and the base color layer 3.

[0032] The composite coating 2 includes a fiber layer 21 and a nano-aluminum oxide powder layer 22 and a nano-calcium carbonate coating 23 disposed in the fiber layer 21 . An isolation layer 24 is disposed between the nano-aluminum oxide powder layer 22 and the nano-calcium carbonate coating 23 .

[0033] The isolation layer 24 includes the following components: natural rosin modified resin, terpene resin, cyclohexane oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and anti-fogging agent.

[0034] The isolation layer 24 includes the following components by weight: 10 parts of natural rosin modified resin, 20 parts of terpene resin, 5 parts of cyclohexane oil, 3 parts of compatibilizer, 2 parts of softener, 5 parts of graphene, 0.5 parts of silane coupling agent, 0.1 parts of antioxidant, 0.1 parts of lubricant, and 0.3 parts of anti-fog agent.

[0035] The thickness of the nano-aluminum oxide powder layer 22 is 20 g / m 2 , and the thickness of the nano-calcium carbonate coating layer 23 is 10 g / m 2 .

[0036] The fiber layer 21 is made of a compound of plant fiber and animal fiber. The fiber width of the fiber layer 21 is 0.006 mm, the aspect ratio of the fiber is greater than or equal to 5:2, and the density of the heat-sensitive surface material is 1.21 g / cm3.

[0037] The heat-sensitive layer 1 comprises the following components in parts by weight: 10 parts of a developer, 0.2 parts of a dispersant, 5 parts of 1,2-diphenoxyethane, 8 parts of zinc stearate, 10 parts of a sensitizer, 10 parts of diatomaceous earth, 6 parts of an adhesive, 5 parts of a phenolic resin, 3 parts of methyl benzoate, 30 parts of water, 4 parts of a colorless dye, 1 part of polyvinyl alcohol, 1 part of a lubricant, and 1 part of a water-retaining agent.

[0038] The first adhesive layer and the second adhesive layer are both made of hot melt adhesive, water adhesive or solvent adhesive, and the base color layer 3 is made of the following raw materials in parts by weight: 0.1 part of dispersant, 5 parts of calcined kaolin, 2 parts of 4,4'-dihydroxydiphenyl sulfone, 5 parts of zinc stearate emulsion, 0.5 part of cast polypropylene, and 0.1 part of defoaming agent.

[0039] The waterproof layer 4 is one of a lamination film, a polyethylene film, a polypropylene film or a polyester film.

[0040] A method for preparing the above-mentioned thermal surface material capable of improving label printing clarity comprises the following steps:

[0041] S1. Preparation of heat-sensitive layer 1: 1,2-diphenoxyethane, zinc stearate, sensitizer, diatomaceous earth, and water are uniformly mixed in proportion to obtain a mixed solution 1;

[0042] Then, the adhesive, the colorless dye, the polyvinyl alcohol, the lubricant, the water-retaining agent, the color developer, and the dispersant are mixed uniformly in proportion to obtain a mixed solution 2;

[0043] Mix the mixture 1 and the mixture 2, add phenolic resin and methyl benzoate in proportion, and stir evenly to obtain a heat-sensitive emulsion.

[0044] S2, preparation of composite coating 2: natural rosin modified resin, terpene resin, naphthenic oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and antifogging agent are mixed in proportion to obtain an isolation emulsion, the isolation emulsion is evenly coated on the nano-aluminum oxide powder layer 22, and then the nano-calcium carbonate coating 23 is covered on the isolation emulsion to obtain composite coating 2;

[0045] S3, preparation of base color layer 3: dispersant, calcined kaolin, 4,4'-dihydroxydiphenyl sulfone, zinc stearate emulsion, cast polypropylene, and defoamer are mixed uniformly in proportion to form a base color emulsion, and waterproof layer 4 is covered on adhesive layer 5, and the base color emulsion is evenly coated on waterproof layer 4;

[0046] S4. Preparation of thermal surface material: Cover the composite coating 2 prepared in step S2 on the base color layer 3, and then cover the thermal layer 1 prepared in step S1 on the nano-scale aluminum oxide powder layer 22 of the composite coating 2 to obtain a thermal surface material that can improve the clarity of label printing.

[0047] Example 2:

[0048] A heat-sensitive surface material capable of improving the clarity of label printing comprises, from top to bottom, a heat-sensitive layer 1, a composite coating 2, a base color layer 3, a waterproof layer 4, and an adhesive layer 5. A first adhesive layer is provided between the composite coating 2 and the heat-sensitive layer 1, and a second adhesive layer is provided between the composite coating 2 and the base color layer 3.

[0049] The composite coating 2 includes a fiber layer 21 and a nano-aluminum oxide powder layer 22 and a nano-calcium carbonate coating 23 disposed in the fiber layer 21 . An isolation layer 24 is disposed between the nano-aluminum oxide powder layer 22 and the nano-calcium carbonate coating 23 .

[0050] The isolation layer 24 includes the following components: natural rosin modified resin, terpene resin, cyclohexane oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and anti-fogging agent.

[0051] The isolation layer 24 includes the following components in parts by weight: 20 parts of natural rosin modified resin, 40 parts of terpene resin, 10 parts of cyclohexane oil, 5 parts of compatibilizer, 10 parts of softener, 8 parts of graphene, 1.0 part of silane coupling agent, 0.5 part of antioxidant, 0.5 part of lubricant, and 0.7 part of anti-fogging agent.

[0052] The thickness of the nano-aluminum oxide powder layer 22 is 35 g / m 2 , and the thickness of the nano-calcium carbonate coating 23 is 20 g / m 2 .

[0053] The fiber layer 21 is made of a compound of plant fiber and animal fiber. The fiber width of the fiber layer 21 is 0.008 mm, the aspect ratio of the fiber is greater than or equal to 5:2, and the density of the heat-sensitive surface material is 1.64 g / cm3.

[0054] The heat-sensitive layer 1 comprises the following components in parts by weight: 20 parts of a developer, 0.5 parts of a dispersant, 10 parts of 1,2-diphenoxyethane, 12 parts of zinc stearate, 20 parts of a sensitizer, 34 parts of diatomaceous earth, 10 parts of an adhesive, 8 parts of a phenolic resin, 9 parts of methyl benzoate, 40 parts of water, 8 parts of a colorless dye, 5 parts of polyvinyl alcohol, 4 parts of a lubricant, and 2 parts of a water-retaining agent.

[0055] The first adhesive layer and the second adhesive layer are both made of hot melt adhesive, water adhesive or solvent adhesive, and the base color layer 3 is made of the following raw materials in parts by weight: 0.5 parts of dispersant, 10 parts of calcined kaolin, 6 parts of 4,4'-dihydroxydiphenyl sulfone, 8 parts of zinc stearate emulsion, 0.8 parts of cast polypropylene, and 0.5 parts of defoaming agent.

[0056] The waterproof layer 4 is one of a lamination film, a polyethylene film, a polypropylene film or a polyester film.

[0057] A method for preparing the above-mentioned thermal surface material capable of improving label printing clarity comprises the following steps:

[0058] S1. Preparation of heat-sensitive layer 1: 1,2-diphenoxyethane, zinc stearate, sensitizer, diatomaceous earth, and water are uniformly mixed in proportion to obtain a mixed solution 1;

[0059] Then, the adhesive, the colorless dye, the polyvinyl alcohol, the lubricant, the water-retaining agent, the color developer, and the dispersant are mixed uniformly in proportion to obtain a mixed solution 2;

[0060] Mix the mixture 1 and the mixture 2, add phenolic resin and methyl benzoate in proportion, and stir evenly to obtain a heat-sensitive emulsion.

[0061] S2, preparation of composite coating 2: natural rosin modified resin, terpene resin, naphthenic oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and antifogging agent are mixed in proportion to obtain an isolation emulsion, the isolation emulsion is evenly coated on the nano-aluminum oxide powder layer 22, and then the nano-calcium carbonate coating 23 is covered on the isolation emulsion to obtain composite coating 2;

[0062] S3, preparation of base color layer 3: dispersant, calcined kaolin, 4,4'-dihydroxydiphenyl sulfone, zinc stearate emulsion, cast polypropylene, and defoamer are mixed uniformly in proportion to form a base color emulsion, and waterproof layer 4 is covered on adhesive layer 5, and the base color emulsion is evenly coated on waterproof layer 4;

[0063] S4. Preparation of thermal surface material: Cover the composite coating 2 prepared in step S2 on the base color layer 3, and then cover the thermal layer 1 prepared in step S1 on the nano-scale aluminum oxide powder layer 22 of the composite coating 2 to obtain a thermal surface material that can improve the clarity of label printing.

[0064] Example 3:

[0065] A heat-sensitive surface material capable of improving the clarity of label printing comprises, from top to bottom, a heat-sensitive layer 1, a composite coating 2, a base color layer 3, a waterproof layer 4, and an adhesive layer 5. A first adhesive layer is provided between the composite coating 2 and the heat-sensitive layer 1, and a second adhesive layer is provided between the composite coating 2 and the base color layer 3.

[0066] The composite coating 2 includes a fiber layer 21 and a nano-aluminum oxide powder layer 22 and a nano-calcium carbonate coating 23 disposed in the fiber layer 21 . An isolation layer 24 is disposed between the nano-aluminum oxide powder layer 22 and the nano-calcium carbonate coating 23 .

[0067] The isolation layer 24 includes the following components: natural rosin modified resin, terpene resin, cyclohexane oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and anti-fogging agent.

[0068] The isolation layer 24 includes the following components by weight: 15 parts of natural rosin modified resin, 30 parts of terpene resin, 7 parts of cyclohexane oil, 4 parts of compatibilizer, 6 parts of softener, 6 parts of graphene, 0.8 parts of silane coupling agent, 0.3 parts of antioxidant, 0.3 parts of lubricant, and 0.5 parts of anti-fogging agent.

[0069] The thickness of the nano-aluminum oxide powder layer 22 is 27 g / m 2 , and the thickness of the nano-calcium carbonate coating 23 is 15 g / m 2 .

[0070] The fiber layer 21 is made of a compound of plant fiber and animal fiber. The fiber width of the fiber layer 21 is 0.007 mm, the aspect ratio of the fiber is greater than or equal to 5:2, and the density of the heat-sensitive surface material is 1.42 g / cm3.

[0071] The heat-sensitive layer 1 comprises the following components in parts by weight: 15 parts of a developer, 0.3 parts of a dispersant, 8 parts of 1,2-diphenoxyethane, 10 parts of zinc stearate, 15 parts of a sensitizer, 22 parts of diatomaceous earth, 8 parts of an adhesive, 6 parts of a phenolic resin, 6 parts of methyl benzoate, 35 parts of water, 6 parts of a colorless dye, 3 parts of polyvinyl alcohol, 2 parts of a lubricant, and 1.5 parts of a water-retaining agent.

[0072] The waterproof layer 4 is one of a lamination film, a polyethylene film, a polypropylene film or a polyester film.

[0073] The first adhesive layer and the second adhesive layer are both made of hot melt adhesive, water adhesive or solvent adhesive, and the base color layer 3 is made of the following raw materials in parts by weight: 0.3 parts of dispersant, 7 parts of calcined kaolin, 4 parts of 4,4'-dihydroxydiphenyl sulfone, 6 parts of zinc stearate emulsion, 0.6 parts of cast polypropylene, and 0.3 parts of defoaming agent.

[0074] A method for preparing the above-mentioned thermal surface material capable of improving label printing clarity comprises the following steps:

[0075] S1. Preparation of heat-sensitive layer 1: 1,2-diphenoxyethane, zinc stearate, sensitizer, diatomaceous earth, and water are uniformly mixed in proportion to obtain a mixed solution 1;

[0076] Then, the adhesive, the colorless dye, the polyvinyl alcohol, the lubricant, the water-retaining agent, the color developer, and the dispersant are mixed uniformly in proportion to obtain a mixed solution 2;

[0077] Mix the mixture 1 and the mixture 2, add phenolic resin and methyl benzoate in proportion, and stir evenly to obtain a heat-sensitive emulsion.

[0078] S2, preparation of composite coating 2: natural rosin modified resin, terpene resin, naphthenic oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and antifogging agent are mixed in proportion to obtain an isolation emulsion, the isolation emulsion is evenly coated on the nano-aluminum oxide powder layer 22, and then the nano-calcium carbonate coating 23 is covered on the isolation emulsion to obtain composite coating 2;

[0079] S3, preparation of base color layer 3: dispersant, calcined kaolin, 4,4'-dihydroxydiphenyl sulfone, zinc stearate emulsion, cast polypropylene, and defoamer are mixed uniformly in proportion to form a base color emulsion, and waterproof layer 4 is covered on adhesive layer 5, and the base color emulsion is evenly coated on waterproof layer 4;

[0080] S4. Preparation of thermal surface material: Cover the composite coating 2 prepared in step S2 on the base color layer 3, and then cover the thermal layer 1 prepared in step S1 on the nano-scale aluminum oxide powder layer 22 of the composite coating 2 to obtain a thermal surface material that can improve the clarity of label printing.

[0081] In the present invention, any one of the films, namely, the laminating film, the polyethylene film, the polypropylene film or the polyester film, can make the label have good water resistance, effectively prevent the migration of components in the glue from causing heat-sensitive fading, and ensure the stability of the label quality.

[0082] The main raw material of nano-calcium carbonate can be derived from common and inexpensive materials such as stone and stone powder slurry. Therefore, the production cost of the printing paper of the present invention is relatively low. Moreover, if the printing paper needs to be discarded, it only needs to be exposed to the sun for a long time, such as 2-3 months, to weather into stone powder, without producing highly toxic gases and carcinogens, which is beneficial to the environment.

[0083] Natural rosin modified resin is a modified resin obtained by high-temperature esterification of natural rosin. Under the action of thermal disproportionation reaction, its conjugated double bonds and oxygen absorption capacity are reduced, and its aging resistance is improved. However, due to its small relative molecular weight and low softening point, most of it is compatible with the D segment (rubber segment) when mixed with the elastomer. It can well adhere the nano-aluminum oxide powder layer 22 and the nano-calcium carbonate coating 23 to the isolation layer 24.

[0084] Comparative Example 1: Traditional label thermal paper on the market.

[0085] The above-mentioned examples 1-3 and the conventional label thermal paper of comparative example 1 were respectively printed with the same text using a label printer, and the text on the labels was observed. The specific results are shown in Table 1

[0086] Table 1 Application effects of label paper with different thermal surface materials

[0087] Printing completed in 12 hours Printing completed in 1 week Example 1 Clear handwriting The writing is clear, but the font color is light Example 2 Clear handwriting The handwriting is clear and the label paper is complete. Example 3 Clear handwriting The handwriting is clear and the label paper is complete. Comparative Example 1 Clear handwriting The handwriting is blurred and there are gray and black stains on the paper.

[0088] The above results show that the thermal surface material prepared in this application has a good function of keeping the handwriting clear. In the present invention, the thermal surface material prepared in Example 3 is preferably used as label paper for printing. The QR code and product information printed on this label paper can keep the handwriting clear for a long time.

[0089] The implementation principle of the present invention is as follows: the present invention discloses a thermal surface material and a preparation method thereof that can improve the clarity of label printing. A composite coating 2 is arranged between the thermal layer 1 and the base color layer 3. The composite coating 2 is composed of a fiber layer 21 and a nano-aluminum oxide powder layer 22 and a nano-calcium carbonate coating 23 arranged in the fiber layer 21. The porosity of the nano-aluminum oxide powder layer 22 and the nano-calcium carbonate coating 23 is as high as more than 75%, and the porosity of the fiber layer 21 is as high as more than 80%. When printing a large amount of ink, it will be quickly absorbed into the aluminum oxide powder layer, the nano-calcium carbonate coating 23 and the fiber layer 21, so that the printing of the label can maintain extremely high image clarity.

[0090] Furthermore, due to the high porosity of the fiber layer 21, the nano-scale calcium carbonate coating 23 and the nano-scale aluminum oxide powder layer 22 can be well hidden within the fiber layer 21, making the fiber layer 21 more substantial and increasing the toughness and elasticity of the label. This effectively solves the problems of label curling and bubbling caused by water contact, resulting in unexpected results, a high degree of innovation, and great economic value.

[0091] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A thermal surface material capable of improving the clarity of label printing, characterized in that: A heat-sensitive layer (1), a composite coating (2), a base color layer (3), a waterproof layer (4) and an adhesive layer (5) are sequentially provided from top to bottom, a first adhesive layer is provided between the composite coating (2) and the heat-sensitive layer (1), and a second adhesive layer is provided between the composite coating (2) and the base color layer (3); The composite coating (2) comprises a fiber layer (21), a nano-aluminum oxide powder layer (22) and a nano-calcium carbonate coating (23) arranged in the fiber layer (21), and an isolation layer (24) is provided between the nano-aluminum oxide powder layer (22) and the nano-calcium carbonate coating (23).

2. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The isolation layer (24) comprises the following components: natural rosin modified resin, terpene resin, cycloalkane oil, compatibilizer, softener, graphene, silane coupling agent, antioxidant, lubricant, and anti-fogging agent.

3. The thermal surface material capable of improving label printing clarity according to claim 2, characterized in that: The isolation layer (24) comprises the following components in parts by weight: 10-20 parts of natural rosin modified resin, 20-40 parts of terpene resin, 5-10 parts of cyclohexane oil, 3-5 parts of compatibilizer, 2-10 parts of softener, 5-8 parts of graphene, 0.5-1.0 parts of silane coupling agent, 0.1-0.5 parts of antioxidant, 0.1-0.5 parts of lubricant, and 0.3-0.7 parts of anti-fogging agent.

4. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The thickness of the nano-scale aluminum oxide powder layer (22) is 20-35 g / m2, and the thickness of the nano-scale calcium carbonate coating (23) is 10-20 g / m2.

5. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The fiber layer (21) is formed by compounding plant fibers and animal fibers, the fiber width of the fiber layer (21) is 0.006-0.008 mm, the aspect ratio of the fibers is greater than or equal to 5:2, and the density of the heat-sensitive surface material is 1.21-1.64 g / cm³.

6. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The heat-sensitive layer (1) comprises the following components in parts by weight: 10-20 parts of a developer, 0.2-0.5 parts of a dispersant, 5-10 parts of 1,2-diphenoxyethane, 8-12 parts of zinc stearate, 10-20 parts of a sensitizer, 10-34 parts of diatomaceous earth, 6-10 parts of an adhesive, 5-8 parts of a phenolic resin, 3-9 parts of methyl benzoate, 30-40 parts of water, 4-8 parts of a colorless dye, 1-5 parts of polyvinyl alcohol, 1-4 parts of a lubricant, and 1-2 parts of a water-retaining agent.

7. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The first adhesive layer and the second adhesive layer are both adhesive layers made of hot melt adhesive, water adhesive or solvent adhesive, and the base color layer (3) is made of the following raw materials in parts by weight: 0.1-0.5 parts of dispersant, 5-10 parts of calcined kaolin, 2-6 parts of 4,4'-dihydroxydiphenyl sulfone, 5-8 parts of zinc stearate emulsion, 0.5-0.8 parts of cast polypropylene, and 0.1-0.5 parts of defoaming agent.

8. The thermal surface material capable of improving label printing clarity according to claim 1, characterized in that: The waterproof layer (4) is one of a lamination film, a polyethylene film, a polypropylene film or a polyester film.

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