Hot melt printing recording paper and method for producing the same

Abstract

The present application belongs to the field of hot melt printing recording paper, and particularly relates to a hot melt printing recording paper and a preparation method thereof. In the hot melt printing recording paper, the calcium titanium white dispersion liquid and the alumina dispersion liquid cooperate with each other, so that the moisture absorption, quick drying and protection effects of the recording paper are improved, the hot melt printing recording paper is suitable for recording media such as water-based signature pens and oil-based pens, can prevent smearing, has the effect of quick drying and not being scratched, and the color developing effect of the content such as bar code or information of the hot melt printing is good, waterproof, resistant to scratching and resistant to solvent invasion.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of hot melt printing recording paper, and particularly relates to a hot melt printing recording paper and a preparation method thereof. BACKGROUND

[0002] Hot melt printing is to use a hot melt printer to print under the condition that the surface of the coated coating formula is heated, and the dye crystals are made into a coating on the surface of the paper, and the required characters and information are displayed when the print head is heated, without using any consumables such as ink, carbon powder, ribbon, etc., and the paper coating can be printed. The heat-sensitive paper is also one of the hot melt printing recording papers, and the heat-sensitive paper is concerned in the application fields of learning supplies, hospital prescriptions, etc.

[0003] From the application of the heat-sensitive paper coating, the sealing property of the heat-sensitive coating is beneficial to the high-density color development performance and the protection performance of the heat-sensitive paper. However, from the perspective of writing paper, it is generally required that the paper absorbs ink quickly, and after writing, the ink is mainly absorbed by the capillary action of the paper fibers, and the low-molecular binder and solvent enter the paper interior at a relatively slow speed through small pores and the rough surface of the paper fibers, and with the extension of time, the solvent content in the ink layer on the paper surface decreases, the ink viscosity increases, and the ink layer coagulates and solidifies; therefore, the more loose the paper is, the larger the pores are, and the stronger the ink absorption is. Therefore, the conventional heat-sensitive material cannot quickly and effectively ink writing. In the prior art, the effect of fast ink absorption and no smearing is achieved by using a modified heat-sensitive coating formula based on silica, and in daily life, important information such as learning test papers and hospital prescription sheets needs to have certain protection performance. However, the above-mentioned heat-sensitive paper with a modified heat-sensitive coating of silica does not have protection performance, and cannot resist the influence of solvent type, external environment collision, etc., which seriously affects the information readability of the paper, especially after a certain period of time, information degradation occurs, information is easily lost, and the effect of high drying rate, fast drying without smearing, and good durability cannot be achieved.

[0004] Therefore, it is still necessary to continue to develop a hot melt printing recording paper that can prevent smearing, can solve the problems of the heat-sensitive paper that cannot easily absorb ink, cannot quickly dry, does not have protection performance such as water resistance, alcohol resistance, solvent resistance, etc., has a short service life, and has poor mechanical strength, and improve the moisture absorption, quick drying, and protection effect of the heat-sensitive paper. SUMMARY

[0005] In view of the problems of the hot melt printing recording paper in the prior art, such as smearing prevention performance, no quick drying, and no protection function, the present application provides a hot melt printing recording paper and a preparation method thereof.

[0006] To achieve the above-mentioned purpose, the following technical solutions are specifically included:

[0007] A hot melt printing recording paper, comprising a paper base material and a hot melt coating layer coated on the paper base material,

[0008] The paper base material is obtained by wire-forming, sizing, dewatering and polishing a fiber slurry containing fibers and a titanium calcium white dispersion liquid;

[0009] The hot melt coating layer is prepared by coating a leveling layer composition, a color developing composition and a medium composition in sequence;

[0010] The mass percentage of the leveling layer composition, the color developing composition and the medium composition is 30-45%, 30-45% and 20-30% respectively, based on the total mass percentage of 100% of the three compositions;

[0011] The leveling layer composition comprises the following components in parts by weight: calcined kaolin 10-20 parts, alumina dispersion liquid 10-30 parts, polyvinyl alcohol 5-12 parts, thermoplastic pigment 10-40 parts, wetting defoaming agent 5-10 parts and dispersant 5-10 parts;

[0012] The medium composition comprises the following components in parts by weight: titanium calcium white dispersion liquid 15-20 parts, alumina dispersion liquid 5-10 parts, talc 5-10 parts, acrylic water-soluble dispersion 15-28 parts, styrene-acrylic latex 30-45 parts, zinc stearate 10-20 parts, dispersant 5-10 parts, wetting defoaming agent 5-10 parts and surfactant 6-8 parts;

[0013] In the leveling layer composition and the medium composition, the alumina dispersion liquid comprises the following components in parts by weight: alumina 60-70 parts, polyvinyl alcohol 3-8 parts, dispersant 5-10 parts and water 10-20 parts, and the average particle size of the alumina dispersion liquid is 0.5-1 µm;

[0014] In the paper base material and the medium composition, the titanium calcium white dispersion liquid comprises the following components in parts by weight: titanium dioxide 25-35 parts, calcium sulfate 75-65 parts, water 10-20 parts, polyvinyl alcohol 3-8 parts and dispersant 5-10 parts.

[0015] In the hot melt printing recording paper of the present application, the titanium calcium white dispersion liquid and the alumina dispersion liquid cooperate with each other to synergistically improve the moisture absorption, quick drying and protection effects of the recording paper, so that the hot melt printing recording paper is suitable for recording with water-based signature pens and oil-based pens and other media, can prevent smearing, has the effect of quick drying without being scratched, and has good color developing effect, waterproofness, scratch resistance and solvent resistance.

[0016] The calcined kaolin and the alumina dispersion liquid in the flat layer composition are important components. Through the adsorption combination reaction between the alumina dispersion liquid and the calcined kaolin, the crystal structure of the calcined kaolin and the alumina forms a hexagonal stone type crystal structure, so that the flat layer composition has good fluidity and spreadability, and when forming the coating layer, a stable and dense hexagonal stone type crystal structure is formed, which lays a solid flat layer for the subsequent hot-melt color developing composition layer and hot-melt receiving medium composition layer.

[0017] The titanium calcium white dispersion liquid in the fiber slurry can be firmly adhered to the fiber to form a firmly adhered fiber combination layer, thereby improving the hygroscopicity of the paper base layer fiber, laying a hygroscopic foundation for the printing paper, and enabling the ink of the water-based pen or writing pen on the hot-melt coating layer to quickly penetrate and be absorbed by the paper base material, thereby improving the absorption and hygroscopicity of the original paper fiber without affecting the strength of the paper base material.

[0018] The medium composition as the raw material of the hot-melt receiving medium layer is compounded with the titanium calcium white dispersion liquid and the alumina dispersion liquid, and the two components have a synergistic effect. The alumina dispersion liquid improves the downward penetration rate of the water-based or writing pen ink on the hot-melt coating layer, thereby enabling the ink on the surface to effectively spread on the coating layer. The combination of the calcium titanium white and the ultra-fine alumina produces good coating absorbency, improves the ink spreading when the hot-melt coating layer is written on, and effectively improves the migration degree of the ink to the fiber layer. At the same time, the alumina in the hot-melt coating layer is combined with the styrene-acrylic latex white to form a coating layer with a certain sealing property, thereby improving the sealing property of the hot-melt coating layer and providing good protection against water, oil, and alcohol solvents without affecting the high-sensitivity developing performance of the hot-melt coating layer, thereby effectively ensuring the full development of the hot-melt coating layer.

[0019] Preferably, the developing composition includes the following components by weight: 4,4'-dihydroxy diphenyl sulfone 15-30 parts, 2-anilino-6-dibutylamino-3-methyl-fluorane 10-20 parts, 1,2-di-m-tolyloxy ethane 30-40 parts, polyvinyl alcohol 5-12 parts, modified corn starch 18-28 parts, and surfactant 5-8 parts.

[0020] The developing composition layer can be a conventional developing material for thermal paper in the art, and in particular, using the above-mentioned developing composition formula can make the developing performance of the hot-melt printing recording paper better, and the developing clarity is high, thereby providing a good hot-melt reaction developing foundation for the subsequent hot-melt receiving medium composition layer.

[0021] Preferably, the mass percentage of the fiber and the titanium calcium white dispersion liquid in the fiber slurry is 45-75% and 25-55%, respectively, based on 100% of the mass percentage of the fiber slurry.

[0022] Preferably, the calcium white dispersion liquid has a mass percentage of 30-40%.

[0023] Preferably, the alumina is ultra-fine alumina with a purity of more than 99%.

[0024] Preferably, in the smoothing layer composition, the weight of the alumina dispersion liquid is 15-20 parts.

[0025] Preferably, in the medium composition, the mass ratio of the titanium calcium white dispersion liquid and the alumina dispersion liquid is (1.5-4):1.

[0026] Preferably, the average particle size of the smoothing layer composition is 2-12 μm.

[0027] The fine particle size of the smoothing layer composition makes the coating smoother, and thus the paper can be used in writable fields such as signing, and has good writing suitability.

[0028] Preferably, the fibers include at least one of wood pulp fibers and broadleaf wood pulp fibers; the thermoplastic pigments include at least one of polyethylene thermoplastic pigments and polyvinyl chloride thermoplastic pigments; the wetting defoaming agents both include alkoxylate defoaming agents; the dispersants both include anionic surfactants, specifically, such as sodium dodecyl sulfate; the styrene-acrylic latex is styrene-acrylic copolymer latex; the aqueous acrylic dispersion is an aqueous acrylic emulsion, specifically, such as an aqueous plastic coating acrylic emulsion; the surfactants both are ionic surfactants; the ionic surfactants include at least one of stearic acid, oleic acid, lauric acid, sodium dodecyl sulfate, and sodium dodecyl benzene sulfonate.

[0029] Preferably, the total coating amount of the hot melt coating layer coated on the paper base material is 2-10 g / m 2 .

[0030] The present application also provides a preparation method of the hot melt printing recording paper, comprising the following steps:

[0031] (1) uniformly mixing fibers and a titanium calcium white dispersion liquid to obtain a fiber slurry; the fiber slurry is subjected to wire forming, sizing, dehydration, and calendering to obtain a paper base material;

[0032] (2) adjusting the pH values of a smoothing layer composition, a color developing composition, and a medium composition to 7.5-9, and then coating the smoothing layer composition, the color developing composition, and the medium composition on the paper base material in sequence, and then calendering and drying to obtain the hot melt printing recording paper.

[0033] Preferably, in step (1), in the sizing, the thickness of the sizing agent is 2-10 μm, and the grammage of the paper base material is 40-80 g / m2 .

[0034] Preferably, in step (2), the coating speed is 600-1000 m / min, and the coating method comprises at least one of a metering rod method, a blade coating method, and a curtain coating method.

[0035] Compared with the prior art, the present application has the following beneficial effects: in the hot melt printing recording paper of the present application, the calcium titanium white dispersion liquid and the alumina dispersion liquid cooperate with each other to synergistically improve the moisture absorption, quick drying property and protection effect of the recording paper, so that the hot melt printing recording paper is suitable for recording media such as water-based signing pens and oil-based pens, can prevent smearing, has the effect of quick drying without being scratched, and has good color development effect, waterproofness, scratch resistance and solvent resistance. DETAILED DESCRIPTION

[0036] In order to better illustrate the purpose, technical scheme and advantages of the present application, the present application will be further described below through specific examples. Unless otherwise specified, the test methods used in the examples and / or comparative examples are all conventional methods; and the materials, reagents, etc. used are all commercially available unless otherwise specified.

[0037] The following part of the raw material information: calcined kaolin is nano calcined kaolin TY-209 50 nm; fiber is wood pulp fiber; thermoplastic pigment is polyethylene thermoplastic pigment; wetting and defoaming agent is alkoxylate defoaming agent, Guanbao DENSIPOL PA 240; dispersant is sodium dodecyl sulfate; acrylic water-soluble dispersion is used for water-based acrylic emulsion (water-based plastic coating), Anhui Liebang Nanotechnology Co., Ltd., PYM-16813; styrene-acrylic latex is styrene-acrylic copolymer emulsion, 25085-34-1, Wuhan Jixinyibang Biological Technology Co., Ltd.; surfactant is stearic acid; 99.9% high-purity ultrafine alumina is ultrafine alumina powder xz-L20 with a particle size of 100 nanometers; modified corn starch is acetylated distarch phosphate, Zhengzhou Lingde Chemical Product Co., Ltd.

[0038] Example 1

[0039] The hot melt printing recording paper in this embodiment comprises a paper base material and a hot melt coating layer coated on the paper base material,

[0040] The paper base material is obtained by web forming, sizing, dewatering and polishing of a fiber slurry containing fiber and titanium calcium white dispersion liquid;

[0041] Taking the mass percentage content of the fiber slurry as 100%, the mass percentage content of the fiber and the titanium calcium white dispersion liquid in the fiber slurry is 60%, 40%;

[0042] The hot melt coating layer is prepared by coating the leveling layer composition, the color developing composition and the medium composition in sequence.

[0043] In the hot melt coating layer, the mass percentage of the leveling layer composition, the color developing composition and the medium composition is 35%, 45% and 20% respectively, based on the total mass percentage of 100% of the three compositions.

[0044] The leveling layer composition comprises the following components in parts by weight: calcined kaolin 12 parts, alumina dispersion liquid 20 parts, polyvinyl alcohol 6 parts, thermoplastic pigment 30 parts, wetting defoaming agent 8 parts, dispersant 8 parts.

[0045] The color developing composition comprises the following components in parts by weight: 4,4'-dihydroxy diphenyl sulfone 18 parts, 2-anilino-6-dibutylamino-3-methyl-fluoran 20 parts, 1,2-di-m-tolyloxy ethane 30 parts, polyvinyl alcohol 12 parts, modified corn starch 28 parts, surfactant 6 parts.

[0046] The medium composition comprises the following components in parts by weight: titanium calcium white dispersion liquid 21 parts, alumina dispersion liquid 7 parts (the mass ratio of the titanium calcium white dispersion liquid to the alumina dispersion liquid is 3:1), talc 10 parts, acrylic water-soluble dispersion 28 parts, styrene-acrylic latex 45 parts, zinc stearate 20 parts, dispersant 8 parts, wetting defoaming agent 8 parts, surfactant 7 parts.

[0047] In the leveling layer composition and the medium composition, the alumina dispersion liquid comprises the following components in parts by weight: alumina 65 parts, polyvinyl alcohol 5 parts, dispersant 7 parts, water 15 parts, and the average particle size of the alumina dispersion liquid is 0.5-1 μm.

[0048] In the paper-based material and the medium composition, the titanium calcium white dispersion liquid comprises the following components in parts by weight: titanium dioxide 30 parts, 70 parts of calcium sulfate, water 15 parts, polyvinyl alcohol 5 parts, dispersant 7 parts.

[0049] The preparation method of the hot melt printing recording paper in the embodiment comprises the following steps:

[0050] (1) titanium calcium white dispersion liquid: 30 parts of titanium dioxide, 70 parts of calcium sulfate, 15 parts of pure water, 5 parts of polyvinyl alcohol and 7 parts of dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer to obtain the titanium calcium white dispersion liquid;

[0051] (2) alumina dispersion liquid: 65 parts of 99.9% high-purity ultrafine alumina, 15 parts of pure water, 5 parts of polyvinyl alcohol and 7 parts of dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer until the average particle size is in the range of 0.5 μm-1 μm;

[0052] The dispersion states of the alumina and titanium calcium white in water are different, if mixed and dispersed together, flocculation reaction is easy to occur, which results in poor dispersion state and easy to block the grinding machine, so the dispersion liquid of the alumina and the titanium calcium white is prepared respectively in the present application;

[0053] (3) the fiber raw material and the titanium calcium white dispersion liquid are mixed uniformly according to the above-mentioned proportion, and the fiber slurry is obtained by beating; the paper base material is obtained by web forming, sizing, dewatering and drying, and calendering, wherein the sizing is light sizing by using a commercially available sizing agent, so that the surface coating layer contains about 6 μm of the sizing agent, and the grammage of the paper base material is in the range of 50 g / m 2 ;

[0054] (4) the flat layer composition, the color developing composition and the medium composition are respectively configured according to the above-mentioned raw material proportion, wherein the average particle size of the flat layer composition is 3.5-8.5 μm;

[0055] (5) the pH values of the flat layer composition, the color developing composition and the medium composition are adjusted to 8.5±0.5 by using ammonia water, and then the flat layer composition, the color developing composition and the medium composition are sequentially coated on the paper base material by using the conventional metering rod method and curtain coating method, the production speed of coating is (600±100) m / min, the ratio of the coating amounts of the flat layer composition, the color developing composition and the medium composition is 2:2:1, and the total coating amount of the hot melt coating layer is 10 g / m 2 , and the hot melt printing recording paper is obtained by calendering and drying.

[0056] Comparative Example 1

[0057] Compared with Example 1, the difference of the present comparative example is that the fiber slurry of the fiber raw material is directly used to make the paper base material without adding the titanium calcium white dispersion liquid.

[0058] Comparative Example 2

[0059] Compared with Example 1, the difference of the present comparative example is that the alumina dispersion liquid is not added in the flat layer composition.

[0060] Comparative Example 3

[0061] Compared with Example 1, the difference of the present comparative example is that the titanium calcium white dispersion liquid is not added in the medium composition.

[0062] Comparative Example 4

[0063] Compared with Example 1, the difference of the present comparative example is that the alumina dispersion liquid is not added in the medium composition.

[0064] Comparative Example 5

[0065] The difference between the present comparative example and Example 1 is only that the medium composition does not contain the alumina dispersion liquid and the titanium calcium white dispersion liquid.

[0066] Comparative Example 6

[0067] The difference between the present comparative example and Comparative Example 1 is only that the paper-based material of the present comparative example does not contain the titanium calcium white dispersion liquid and the hot melt printing coating layer uses a conventional high-sensitivity coating layer available on the market.

[0068] Example 2

[0069] The difference between the present example and Example 1 is only that the weight fraction of the alumina dispersion liquid in the smoothing layer composition is 10 parts.

[0070] Example 3

[0071] The difference between the present example and Example 1 is only that the weight fraction of the alumina dispersion liquid in the smoothing layer composition is 15 parts.

[0072] Example 4

[0073] The difference between the present example and Example 1 is only that the weight fraction of the alumina dispersion liquid in the smoothing layer composition is 30 parts.

[0074] Example 5

[0075] The difference between the present example and Example 1 is only that the mass ratio of the titanium calcium white dispersion liquid to the alumina dispersion liquid in the medium composition is 1.8:1.

[0076] Example 6

[0077] The difference between the present example and Example 1 is only that the mass ratio of the titanium calcium white dispersion liquid to the alumina dispersion liquid in the medium composition is 4:1.

[0078] Example 7

[0079] The difference between the present example and Example 1 is only that the mass percentage of the fiber and the titanium calcium white dispersion liquid in the fiber slurry of the paper-based material is 70%, 30%.

[0080] Example 8

[0081] The difference between the present example and Example 1 is only that the mass percentage of the fiber and the titanium calcium white dispersion liquid in the fiber slurry of the paper-based material is 55%, 45%.

[0082] Example 9

[0083] The hot-melt printing recording paper in the embodiment comprises a paper base material and a hot-melt coating layer coated on the paper base material,

[0084] The paper base material is obtained by web forming, sizing, dewatering and calendering of a fiber slurry containing fibers and titanium calcium white dispersion liquid;

[0085] The mass percentage of the fibers and the titanium calcium white dispersion liquid in the fiber slurry is 60% and 40% respectively, based on 100% of the mass percentage of the fiber slurry;

[0086] The hot-melt coating layer is prepared by coating the flat layer composition, the color developing composition and the medium composition in sequence;

[0087] The mass percentage of the flat layer composition, the color developing composition and the medium composition is 45%, 30% and 25% respectively, based on 100% of the total mass percentage of the flat layer composition, the color developing composition and the medium composition in the hot-melt coating layer;

[0088] The flat layer composition comprises the following components in parts by weight: calcined kaolin 12 parts, alumina dispersion liquid 30 parts, polyvinyl alcohol 10 parts, thermoplastic pigment 40 parts, wetting defoaming agent 5 parts and dispersant 5 parts;

[0089] The color developing composition comprises the following components in parts by weight: 4,4'-dihydroxy diphenyl sulfone 30 parts, 2-anilino-6-dibutylamino-3-methyl-fluoran 15 parts, 1,2-di-m-tolyloxy ethane 15 parts, polyvinyl alcohol 7 parts, modified corn starch 20 parts and surfactant 5 parts;

[0090] The medium composition comprises the following components in parts by weight: titanium calcium white dispersion liquid 15 parts, alumina dispersion liquid 5 parts, talc 15 parts, acrylic water-soluble dispersion 18 parts, styrene-acrylic latex 32 parts, zinc stearate 10 parts, dispersant 5 parts, wetting defoaming agent 5 parts and surfactant 6 parts;

[0091] In the flat layer composition and the medium composition, the alumina dispersion liquid comprises the following components in parts by weight: alumina 60 parts, polyvinyl alcohol 3 parts, dispersant 5 parts and water 10 parts, and the average particle size of the alumina dispersion liquid is 0.5-1 μm;

[0092] In the paper base material and the medium composition, the titanium calcium white dispersion liquid comprises the following components in parts by weight: titanium dioxide 25 parts, calcium sulfate 75 parts, water 10 parts, polyvinyl alcohol 3 parts and dispersant 5 parts.

[0093] The preparation method of the hot-melt printing recording paper in the embodiment comprises the following steps:

[0094] (1) Titanium calcium white dispersion liquid: according to the above-mentioned ratio, titanium dioxide, calcium sulfate, purified water, polyvinyl alcohol and dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer to obtain the titanium calcium white dispersion liquid;

[0095] (2) Alumina dispersion liquid: 99.9% high-purity ultrafine alumina, purified water, polyvinyl alcohol and dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer until the average particle size is in the range of 0.5 μm-1 μm;

[0096] (3) The fiber raw material and the titanium calcium white dispersion liquid are mixed uniformly according to the above-mentioned ratio, and the pulp is beaten to obtain a fiber slurry. The fiber slurry is formed on the wire, sized, dewatered and dried, and polished to obtain a paper base material, wherein the sizing is a light sizing using a commercially available sizing agent, so that the surface coating contains about 4.5 μm of the sizing agent, and the grammage of the paper base material is in the range of 60 g / m 2 ;

[0097] (4) The flat layer composition, the color developing composition and the medium composition are respectively configured according to the above-mentioned raw material ratio, wherein the average particle size of the flat layer composition is 4-7 μm;

[0098] (5) The pH values of the flat layer composition, the color developing composition and the medium composition are adjusted to 8.5±0.5, and then the flat layer composition, the color developing composition and the medium composition are sequentially coated on the paper base material by the metering rod method and the doctor blade coating method, the production speed of coating is (800±100) m / min, and the total coating amount of the hot melt coating layer is 6 g / m 2 , wherein the coating amounts of the flat layer composition layer, the color developing composition layer and the medium composition layer are 2.5 g / m 2 , 2 g / m 2 , 1.5 g / m 2 , respectively, and the hot melt printing recording paper is obtained after polishing and drying.

[0099] Example 10

[0100] The hot melt printing recording paper in this embodiment comprises a paper base material and a hot melt coating layer coated on the paper base material,

[0101] The paper base material is obtained by forming on the wire, sizing, dewatering and polishing the fiber slurry containing fiber and titanium calcium white dispersion liquid;

[0102] The mass percentage of the fiber and the titanium calcium white dispersion liquid in the fiber slurry is 60%, 40% respectively, based on 100% of the mass percentage of the fiber slurry;

[0103] The hot melt coating layer is sequentially coated by the flat layer composition, the color developing composition and the medium composition;

[0104] In the hot melt coating layer, the mass percentage of the leveling layer composition, the color developing composition and the medium composition is 35%, 45% and 20% respectively, based on the total mass percentage of 100% of the leveling layer composition, the color developing composition and the medium composition;

[0105] The leveling layer composition comprises the following components by weight: calcined kaolin 10 parts, alumina dispersion liquid 10 parts, polyvinyl alcohol 8 parts, thermoplastic pigment 25 parts, wetting defoaming agent 6 parts, dispersant 10 parts;

[0106] The color developing composition comprises the following components by weight: 4,4'-dihydroxy diphenyl sulfone 30 parts, 2-anilino-6-dibutylamino-3-methyl-fluoran 15 parts, 1,2-di-m-tolyloxy ethane 15 parts, polyvinyl alcohol 7 parts, modified corn starch 20 parts, surfactant 5 parts;

[0107] The medium composition comprises the following components by weight: titanium calcium white dispersion liquid 15 parts, alumina dispersion liquid 5 parts, talc 15 parts, acrylic water-soluble dispersion 18 parts, styrene-acrylic latex 32 parts, zinc stearate 10 parts, dispersant 10 parts, wetting defoaming agent 10 parts, surfactant 8 parts;

[0108] In the leveling layer composition and the medium composition, the alumina dispersion liquid comprises the following components by weight: alumina 70 parts, polyvinyl alcohol 8 parts, dispersant 10 parts, water 20 parts, and the average particle size of the alumina dispersion liquid is 0.5-1 μm;

[0109] In the paper-based material and the medium composition, the titanium calcium white dispersion liquid comprises the following components by weight: titanium dioxide 35 parts, 65 parts of calcium sulfate, water 20 parts, polyvinyl alcohol 8 parts, dispersant 10 parts.

[0110] The preparation method of the hot melt printing recording paper in the embodiment comprises the following steps:

[0111] (1) titanium calcium white dispersion liquid: according to the above-mentioned ratio, titanium dioxide, calcium sulfate, purified water, polyvinyl alcohol and dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer to obtain the titanium calcium white dispersion liquid;

[0112] (2) alumina dispersion liquid: 99.9% high-purity ultrafine alumina, purified water, polyvinyl alcohol and dispersant are mixed and uniformly dispersed by a high-speed dispersion stirrer until the average particle size is in the range of 0.5 μm-1 μm;

[0113] (3) mixing the fiber raw material and the titanium calcium white dispersion liquid uniformly according to the above-mentioned proportion, beating, to obtain a fiber slurry; the fiber slurry is subjected to web forming, sizing, dewatering and drying, and polishing to obtain a paper base material, wherein the sizing is light sizing using a commercially available sizing agent, so that the surface coating layer contains about 3 μm of the sizing agent, and the paper base material has a grammage in the range of 55 g / m 2 ;

[0114] (4) configuring a flat layer composition, a color developing composition and a medium composition according to the above-mentioned raw material proportions, wherein the average particle size of the flat layer composition is 3-7 μm;

[0115] (5) adjusting the pH values of the flat layer composition, the color developing composition and the medium composition to 8.5±0.5, and then sequentially coating the flat layer composition, the color developing composition and the medium composition onto the paper base material by the metering rod method and the curtain coating method, with a production speed of (800±100) m / min, and a total coating amount of the hot melt coating layer of 5 g / m 2 , wherein the coating amounts of the flat layer composition layer, the color developing composition layer and the medium composition layer are 3 g / m 2 , 2 g / m 2 , and 1 g / m 2 , respectively, and then polishing and drying to obtain the hot melt printing recording paper.

[0116] The printing paper prepared in the above-mentioned examples and comparative examples is tested:

[0117] (1) Gurley test method for testing air permeability: the time for a specified amount of air to pass through a specified area on the paper (here used as a layer of diaphragm) under a specified air pressure. The fixed area on the paper is defined by a ring gauge. Subsequently, the compressed air passes through the layer of "diaphragm" under the pressure of the specified air pressure, and the amount of permeated gas can be measured by a manometer, and the air permeability is expressed by "ml / min"; the qualified range is 1.3-1.8 ml / min;

[0118] (2) writing performance: directly writing the word "Guanghao" on the printing paper with a water-based signing pen, then staying for 10 seconds, and then wiping with the thumb, if the ink of the water-based signing pen is seriously smudged, the word will be blurred, otherwise, it will not be blurred;

[0119] (3) referring to the paper surface water absorption, protection performance, friction and color developing performance of GB / T28210-2011 "thermal paper", wherein the qualified requirements are: water absorption: 30-35 g / m 2 ; protection performance: water: 80% or more, oil: 80% or more, ethanol solvent: 60% or more; anti-friction: 70% or more; color developing performance: 1.2 or more;

[0120] The test results are shown in Table 1.

[0121] Table 1

[0122]

[0123]

[0124] From Example 1 and Comparative Examples 1-2, it can be seen that adding the titanium calcium white dispersion liquid in the fiber slurry can reduce the air permeability of the paper-based material produced, and improve the water absorption, protection performance, color development performance and writing performance.

[0125] From Example 1 and Comparative Examples 3-5, it can be seen that adding the titanium calcium white dispersion liquid and the aluminum oxide dispersion liquid in the medium layer composition have a synergistic effect, which can reduce the air permeability of the paper-based material produced, and improve the water absorption, protection performance, color development performance and writing performance.

[0126] From Example 1 and Comparative Example 6, it can be seen that the air permeability of the hot melt printing paper of the present application is lower than that of the conventional hot melt printing paper on the market, and the water absorption, protection performance, color development performance and writing performance are higher than those of the conventional hot melt printing paper on the market.

[0127] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application and are not intended to limit the scope of protection of the present application. Although the present application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the present application can be modified or replaced by equivalents without departing from the essence and scope of the technical solutions of the present application.

Claims

1. A hot-melt printing recording paper, characterized in that, This includes the paper-based material and the hot-melt coating layer applied to the paper-based material. The paper-based material is obtained by forming a fiber pulp containing fibers and a titanium dioxide dispersion through web forming, sizing, dehydration, and calendering. The hot melt coating layer is obtained by coating a leveling layer composition, a color developing composition, and a medium composition in sequence. With the total mass percentage of the leveling layer composition, color developing composition, and medium composition being 100%, the mass percentages of the leveling layer composition, color developing composition, and medium composition are 30-45%, 30-45%, and 20-30%, respectively. The leveling layer composition comprises the following components in parts by weight: 10-20 parts calcined kaolin, 10-30 parts alumina dispersion, 5-12 parts polyvinyl alcohol, 10-40 parts thermoplastic pigment, 5-10 parts wetting and defoaming agent, and 5-10 parts dispersant. The media composition comprises the following components in parts by weight: 15-20 parts of titanium dioxide dispersion, 5-10 parts of alumina dispersion, 5-10 parts of talc, 15-28 parts of acrylic water-soluble dispersion, 30-45 parts of styrene-acrylic latex, 10-20 parts of zinc stearate, 5-10 parts of dispersant, 5-10 parts of wetting and defoaming agent, and 6-8 parts of surfactant; In the leveling layer composition and the medium composition, the alumina dispersion comprises the following components in parts by weight: 60-70 parts alumina, 3-8 parts polyvinyl alcohol, 5-10 parts dispersant, and 10-20 parts water, and the average particle size of the alumina dispersion is 0.5-1 μm. In the paper-based material and media composition, the titanium-calcium white dispersion comprises the following components in parts by weight: 25-35 parts titanium dioxide, 75-65 parts calcium sulfate, 10-20 parts water, 3-8 parts polyvinyl alcohol, and 5-10 parts dispersant.

2. The hot-melt printing paper as described in claim 1, characterized in that, In the leveling layer composition, the alumina dispersion is 15-20 parts by weight.

3. The hot-melt printing paper as described in claim 1, characterized in that, In the media composition, the mass ratio of the titanium dioxide dispersion to the alumina dispersion is (1.5-4):

1.

4. The hot-melt printing paper as described in claim 1, characterized in that, Based on a fiber pulp content of 100%, the fiber and titanium dioxide dispersions in the fiber pulp contain 45-75% and 25-55% respectively.

5. The hot-melt printing paper as described in claim 4, characterized in that, The mass percentage of the titanium-calcium white dispersion is 30-40%.

6. The hot-melt printing paper as described in claim 1, characterized in that, The colorimetric composition comprises the following components in parts by weight: 15-30 parts of 4,4′-dihydroxydiphenyl sulfone, 10-20 parts of 2-phenylamino-6-dibutylamino-3-methyl-fluorane, 30-40 parts of 1,2-di-m-tolyloxyethane, 5-12 parts of polyvinyl alcohol, 18-28 parts of modified corn starch, and 5-8 parts of surfactant.

7. The hot-melt printing paper as described in claim 1, characterized in that, The average particle size of the leveling layer composition is 2-12 μm; the fiber includes wood pulp fiber; the thermoplastic pigment includes at least one of polyethylene thermoplastic pigment and polyvinyl chloride thermoplastic pigment; the wetting defoamer includes alkoxylated defoamers; the dispersant includes anionic surfactants; the styrene-acrylic latex is a styrene-acrylic copolymer latex; the acrylic water-soluble dispersion is an aqueous acrylic emulsion; and the surfactant in the medium composition is an ionic surfactant.

8. The hot-melt printing paper as described in claim 1, characterized in that, The fibers include hardwood pulp fibers.

9. The hot-melt printing paper as described in claim 1, characterized in that, The total coating weight of the hot-melt coating layer applied to the paper-based material is 2-10 g / m². 2 .

10. A method for preparing the hot-melt printing paper according to any one of claims 1 to 9, characterized in that, Includes the following steps: (1) The fiber and titanium dioxide dispersion are mixed evenly to obtain fiber slurry; the fiber slurry is then subjected to wire forming, sizing, dehydration and calendering to obtain paper-based material; (2) Adjust the pH value of the leveling layer composition, the color developing composition and the medium composition to 7.5-9, and then coat the leveling layer composition, the color developing composition and the medium composition onto the paper base material in sequence. After calendering and drying, the hot melt printing record paper is obtained.

11. The method for preparing the hot-melt printing paper as described in claim 10, characterized in that, In step (1), the thickness of the sizing agent applied during sizing is 2-10 μm, and the basis weight of the paper base material is 40-80 g / m². 2 In step (2), the coating speed is 600-1000 m / min, and the coating method includes at least one of metering bar method, blade coating method, and curtain coating method.

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