阅读说明：本技术 一种高抗水真空镀铝原纸的背涂涂料 (Back coating of high-water-resistance vacuum aluminized base paper ) 是由 李秀梅 陈志强 韩继友 郑鑫 于 2019-07-29 设计创作，主要内容包括：一种高抗水真空镀铝原纸的背涂涂料,具体包含70-85绝干质量份的白色颜料、15-25绝干质量份的胶黏剂、0.3-5绝干质量份的交联抗水剂,0.05-0.30绝干质量份的增稠剂；所述白色颜料为沉淀碳酸钙、研磨碳酸钙、钛白粉、高岭土中的至少一种；所述胶黏剂为丁苯胶乳、羧基丁苯胶乳、聚醋酸乙烯酯乳液、苯丙胶乳,丙烯酸胶乳,聚乙烯醇中的至少一种；所述交联抗水剂为聚酰胺聚脲树脂、乙二醛树脂、氨基树脂、环氧树脂、碳酸锆钾或碳酸锆铵的其中一种；所述增稠剂为羧甲基纤维素钠、疏水改性羟乙基纤维素、疏水性羟乙基尿烷、丙烯酸共聚物中的至少一种；所述涂料的固含量为40%-60%,粘度为200-500CP。(A back coating of highly water-resistant vacuum aluminized base paper specifically comprises 70-85 oven-dried parts by mass of white pigment, 15-25 oven-dried parts by mass of adhesive, 0.3-5 oven-dried parts by mass of cross-linked water repellent agent and 0.05-0.30 oven-dried parts by mass of thickening agent; the white pigment is at least one of precipitated calcium carbonate, ground calcium carbonate, titanium dioxide and kaolin; the adhesive is at least one of styrene-butadiene latex, carboxylic styrene-butadiene latex, polyvinyl acetate emulsion, styrene-acrylic latex, acrylic latex and polyvinyl alcohol; the crosslinking water repellent agent is one of polyamide polyurea resin, glyoxal resin, amino resin, epoxy resin, zirconium potassium carbonate or zirconium ammonium carbonate; the thickening agent is at least one of sodium carboxymethyl cellulose, hydrophobically modified hydroxyethyl cellulose, hydrophobic hydroxyethyl urethane and acrylic copolymer; the solid content of the coating is 40-60%, and the viscosity is 200-500 CP.)

1. The back coating of the high-water-resistance vacuum aluminized base paper is characterized by comprising 70-85 oven dry parts of white pigment, 15-25 oven dry parts of adhesive, 0.3-5 oven dry parts of crosslinking water-resisting agent and 0.05-0.30 oven dry parts of thickening agent; the white pigment is at least one of precipitated calcium carbonate, ground calcium carbonate, titanium dioxide and kaolin; the adhesive is at least one of styrene-butadiene latex, carboxylic styrene-butadiene latex, polyvinyl acetate emulsion, styrene-acrylic latex, acrylic latex and polyvinyl alcohol; the crosslinking water repellent agent is one of polyamide polyurea resin, glyoxal resin, amino resin, epoxy resin, zirconium potassium carbonate or zirconium ammonium carbonate; the thickening agent is at least one of sodium carboxymethyl cellulose, hydrophobically modified hydroxyethyl cellulose, hydrophobic hydroxyethyl urethane and acrylic copolymer; the solid content of the coating is 40-60%, and the viscosity is 200-500 CP.

2. The back coating of highly water-resistant vacuum aluminized base paper of claim 1, characterized in that the white pigment is a mixture of ground calcium carbonate and kaolin mixed in any proportion of ground calcium carbonate or kaolin, the whiteness of the ground calcium carbonate is not less than 90, and the proportion of the particle size less than 2um is not less than 60% of the total content of the ground calcium carbonate; the kaolin is peeled kaolin, the whiteness is not lower than 80, and the diameter-thickness ratio is 10-30.

3. The back coating of highly water-resistant vacuum aluminized base paper according to claim 1 or 2, characterized in that the adhesive is one of styrene-butadiene latex or styrene-acrylic latex, the latex viscosity is less than 300CP, and the particle size is 140-150 nm.

Technical Field

The invention belongs to the field of vacuum aluminizing base paper coatings, and particularly relates to a back coating of high-water-resistance vacuum aluminizing base paper.

Background

Vacuum aluminized paper is increasingly popular in the market due to good packing property, decoration property, economical efficiency and good environment retentivity, and is widely used as a novel environment-friendly material for packing various products, such as cigarette packets, wine bags, cosmetics, food and the like, and products such as laser anti-counterfeiting marks, labels and the like. The oven dry quality of the vacuum aluminized paper depends greatly on the oven dry quality of the vacuum aluminized base paper. The vacuum aluminized paper applied to the wine label is not only required to be suitable for processing various vacuum aluminizing machines, embossing machines and high-speed die cutting machines, but also is required to be suitable for bottle sticking of a high-speed labeling machine. After the label with the glue is attached to the bottle, the solvent of the glue can be quickly evaporated (generally, the solvent is water), water penetrates through the label paper to be evaporated, and the label also plays an important role in the bonding speed of the glue. Therefore, different glue, different purposes and different shapes of labels have different requirements for aluminizing. This patent is to special-shaped label, and glue solid content is lower, needs the body paper to have lower hydroscopicity, prevents the label because of the too emergence of subsides mark wrinkle phenomenon that arouses of hydroscopicity.

Disclosure of Invention

The technical problem to be solved by the invention is to provide a back coating of a high-water-resistance vacuum aluminizing base paper, aiming at the defects in the prior art, and the back coating is used for coating and covering the back surface of the aluminizing base paper contacted with bottle-sticking glue to improve the water resistance of the back surface of the aluminizing base paper, can meet the requirements of other physical indexes of the aluminizing base paper, and does not influence the subsequent aluminizing processing and labeling procedures.

The invention aims to complete the technical scheme that the back coating of the high-water-resistance vacuum aluminized base paper comprises 70-85 oven-dry parts of white pigment, 15-25 oven-dry parts of adhesive, 0.3-5 oven-dry parts of crosslinking water repellent agent and 0.05-0.30 oven-dry parts of thickening agent; the white pigment is at least one of precipitated calcium carbonate, ground calcium carbonate, titanium dioxide and kaolin; the adhesive is at least one of styrene-butadiene latex, carboxylic styrene-butadiene latex, polyvinyl acetate emulsion, styrene-acrylic latex, acrylic latex and polyvinyl alcohol; the crosslinking water repellent agent is one of polyamide polyurea resin, glyoxal resin, amino resin, epoxy resin, zirconium potassium carbonate or zirconium ammonium carbonate; the thickening agent is at least one of sodium carboxymethyl cellulose, hydrophobically modified hydroxyethyl cellulose, hydrophobic hydroxyethyl urethane and acrylic copolymer; the solid content of the coating is 40-60%, and the viscosity is 200-500 CP.

Further, the white pigment is one of ground calcium carbonate or kaolin or a mixture of ground calcium carbonate and kaolin mixed in any proportion, the whiteness of the ground calcium carbonate is not lower than 90, and the proportion of the particle size of the ground calcium carbonate smaller than 2um is not lower than 60% of the total content of the ground calcium carbonate; the kaolin is peeled kaolin, the whiteness is not lower than 80, and the diameter-thickness ratio is 10-30.

Further, the adhesive is one of styrene-butadiene latex or styrene-acrylic latex, the viscosity of the latex is less than 300CP, and the particle size is 140-150 nm.

The invention has the beneficial technical effects that: the vacuum aluminized base paper coated on the back by the coating is normal in aluminized die cutting labeling, and the phenomena of label sliding and label wrinkling are not generated in low-concentration glue labeling.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more clearly understood by those skilled in the art, the present invention is further described with reference to the following embodiments.

The back coating of the highly water-resistant vacuum aluminized base paper comprises 70-85 oven dry parts of white pigment, 15-25 oven dry parts of adhesive, 0.3-5 oven dry parts of crosslinking water repellent agent and 0.05-0.30 oven dry parts of thickening agent; the white pigment is at least one of precipitated calcium carbonate, ground calcium carbonate, titanium dioxide and kaolin; the adhesive is at least one of styrene-butadiene latex, carboxylic styrene-butadiene latex, polyvinyl acetate emulsion, styrene-acrylic latex, acrylic latex and polyvinyl alcohol; the crosslinking water repellent agent is one of polyamide polyurea resin, glyoxal resin, amino resin, epoxy resin, zirconium potassium carbonate or zirconium ammonium carbonate; the thickening agent is at least one of sodium carboxymethyl cellulose, hydrophobically modified hydroxyethyl cellulose, hydrophobic hydroxyethyl urethane and acrylic copolymer; the solid content of the coating is 40-60%, and the viscosity is 200-500 CP.

The white pigment is one of ground calcium carbonate or kaolin or a mixture of ground calcium carbonate and kaolin mixed according to any proportion, the whiteness of the ground calcium carbonate is not lower than 90, and the proportion of the particle size of the ground calcium carbonate smaller than 2um is not lower than 60% of the total content of the ground calcium carbonate; the kaolin is peeled kaolin, the whiteness is not lower than 80, and the diameter-thickness ratio is 10-30. The adhesive is one of styrene-butadiene latex or styrene-acrylic latex, the viscosity of the latex is less than 300CP, and the particle size is 140-150 nm. The purpose of adding the adhesive and the white pigment in the coating system is that the coating can form a coating with uniform thickness on the back surface of paper by coating, so that a fiber layer is sealed, and the function of resisting water is achieved; the purpose of adding the crosslinking water-resistant agent is to crosslink and solidify active hydroxyl in the crosslinking agent and hydroxyl in the adhesive to form a reticular solidified film, thereby achieving the water-resistant effect.

Key physical indexes are as follows: the cobb value is less than or equal to 15g/m2, the water penetration is more than 60s, and the back surface smoothness is less than or equal to 400 s.

The coating formula is implemented by adopting a scraper coating method, and the specific implementation can adopt a scraper coating method and a metering rod coating method.

The following examples illustrate the invention without limiting the scope thereof, the chemicals used being calculated as percentages of dry matter; the following cobb value, water penetration, smoothness tests were performed according to the relevant standards.