CN117364529A - Precoating liquid for moisture-resistant coated paper, preparation method and application thereof - Google Patents
Precoating liquid for moisture-resistant coated paper, preparation method and application thereof Download PDFInfo
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- CN117364529A CN117364529A CN202311418369.XA CN202311418369A CN117364529A CN 117364529 A CN117364529 A CN 117364529A CN 202311418369 A CN202311418369 A CN 202311418369A CN 117364529 A CN117364529 A CN 117364529A
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- moisture
- resistant
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- wet
- coating
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- 239000007788 liquid Substances 0.000 title claims abstract description 125
- 238000002360 preparation method Methods 0.000 title abstract description 11
- 239000011248 coating agent Substances 0.000 claims abstract description 167
- 238000000576 coating method Methods 0.000 claims abstract description 167
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 86
- VTYYLEPIZMXCLO-UHFFFAOYSA-L Calcium carbonate Chemical compound [Ca+2].[O-]C([O-])=O VTYYLEPIZMXCLO-UHFFFAOYSA-L 0.000 claims abstract description 42
- 239000004816 latex Substances 0.000 claims abstract description 32
- 229920000126 latex Polymers 0.000 claims abstract description 32
- 239000000853 adhesive Substances 0.000 claims abstract description 26
- 230000001070 adhesive effect Effects 0.000 claims abstract description 26
- 229910052500 inorganic mineral Inorganic materials 0.000 claims abstract description 26
- 239000011707 mineral Substances 0.000 claims abstract description 26
- 229920002472 Starch Polymers 0.000 claims abstract description 25
- 239000008107 starch Substances 0.000 claims abstract description 25
- 235000019698 starch Nutrition 0.000 claims abstract description 25
- 229910000019 calcium carbonate Inorganic materials 0.000 claims abstract description 21
- FPAFDBFIGPHWGO-UHFFFAOYSA-N dioxosilane;oxomagnesium;hydrate Chemical compound O.[Mg]=O.[Mg]=O.[Mg]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O.O=[Si]=O FPAFDBFIGPHWGO-UHFFFAOYSA-N 0.000 claims abstract description 20
- 239000004372 Polyvinyl alcohol Substances 0.000 claims abstract description 7
- 229920002451 polyvinyl alcohol Polymers 0.000 claims abstract description 7
- 229920002134 Carboxymethyl cellulose Polymers 0.000 claims abstract description 6
- 235000010948 carboxy methyl cellulose Nutrition 0.000 claims abstract description 6
- 239000005995 Aluminium silicate Substances 0.000 claims abstract description 5
- 235000012211 aluminium silicate Nutrition 0.000 claims abstract description 5
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims abstract description 5
- 239000010445 mica Substances 0.000 claims abstract description 5
- 229910052618 mica group Inorganic materials 0.000 claims abstract description 5
- 239000000843 powder Substances 0.000 claims abstract description 5
- 229920001661 Chitosan Polymers 0.000 claims abstract description 3
- 235000010216 calcium carbonate Nutrition 0.000 claims abstract description 3
- 239000001768 carboxy methyl cellulose Substances 0.000 claims abstract description 3
- 239000008112 carboxymethyl-cellulose Substances 0.000 claims abstract description 3
- 239000005018 casein Substances 0.000 claims abstract description 3
- BECPQYXYKAMYBN-UHFFFAOYSA-N casein, tech. Chemical compound NCCCCC(C(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(CC(C)C)N=C(O)C(CCC(O)=O)N=C(O)C(CC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(C(C)O)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=N)N=C(O)C(CCC(O)=O)N=C(O)C(CCC(O)=O)N=C(O)C(COP(O)(O)=O)N=C(O)C(CCC(O)=N)N=C(O)C(N)CC1=CC=CC=C1 BECPQYXYKAMYBN-UHFFFAOYSA-N 0.000 claims abstract description 3
- 235000021240 caseins Nutrition 0.000 claims abstract description 3
- 235000018102 proteins Nutrition 0.000 claims abstract description 3
- 102000004169 proteins and genes Human genes 0.000 claims abstract description 3
- 108090000623 proteins and genes Proteins 0.000 claims abstract description 3
- 239000000123 paper Substances 0.000 claims description 272
- 238000004513 sizing Methods 0.000 claims description 72
- 239000003795 chemical substances by application Substances 0.000 claims description 46
- 239000000314 lubricant Substances 0.000 claims description 42
- 238000000034 method Methods 0.000 claims description 27
- 238000003490 calendering Methods 0.000 claims description 25
- 239000013530 defoamer Substances 0.000 claims description 23
- 239000002174 Styrene-butadiene Substances 0.000 claims description 17
- MTAZNLWOLGHBHU-UHFFFAOYSA-N butadiene-styrene rubber Chemical compound C=CC=C.C=CC1=CC=CC=C1 MTAZNLWOLGHBHU-UHFFFAOYSA-N 0.000 claims description 17
- 239000011115 styrene butadiene Substances 0.000 claims description 17
- 229920003048 styrene butadiene rubber Polymers 0.000 claims description 17
- 239000008367 deionised water Substances 0.000 claims description 16
- 229910021641 deionized water Inorganic materials 0.000 claims description 16
- 239000012752 auxiliary agent Substances 0.000 claims description 13
- QTBSBXVTEAMEQO-UHFFFAOYSA-N Acetic acid Chemical compound CC(O)=O QTBSBXVTEAMEQO-UHFFFAOYSA-N 0.000 claims description 11
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 claims description 7
- 239000006185 dispersion Substances 0.000 claims description 5
- 239000002270 dispersing agent Substances 0.000 claims description 3
- 239000002562 thickening agent Substances 0.000 claims description 3
- 229920002261 Corn starch Polymers 0.000 claims description 2
- 240000003183 Manihot esculenta Species 0.000 claims description 2
- 235000016735 Manihot esculenta subsp esculenta Nutrition 0.000 claims description 2
- 229920000294 Resistant starch Polymers 0.000 claims description 2
- 125000002091 cationic group Chemical group 0.000 claims description 2
- 239000008120 corn starch Substances 0.000 claims description 2
- 239000001254 oxidized starch Substances 0.000 claims description 2
- 235000013808 oxidized starch Nutrition 0.000 claims description 2
- 235000021254 resistant starch Nutrition 0.000 claims description 2
- 238000007789 sealing Methods 0.000 abstract description 5
- 238000001035 drying Methods 0.000 abstract description 4
- 229920001577 copolymer Polymers 0.000 description 20
- 239000002518 antifoaming agent Substances 0.000 description 18
- 239000003112 inhibitor Substances 0.000 description 15
- 239000000463 material Substances 0.000 description 15
- 230000008569 process Effects 0.000 description 15
- 230000004888 barrier function Effects 0.000 description 12
- 239000010410 layer Substances 0.000 description 9
- 238000010521 absorption reaction Methods 0.000 description 8
- 230000005540 biological transmission Effects 0.000 description 8
- 230000015572 biosynthetic process Effects 0.000 description 8
- 239000000126 substance Substances 0.000 description 7
- 238000012360 testing method Methods 0.000 description 7
- 239000004721 Polyphenylene oxide Substances 0.000 description 6
- 229920000570 polyether Polymers 0.000 description 6
- 239000000835 fiber Substances 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 5
- 238000012546 transfer Methods 0.000 description 5
- QIQXTHQIDYTFRH-UHFFFAOYSA-N octadecanoic acid Chemical compound CCCCCCCCCCCCCCCCCC(O)=O QIQXTHQIDYTFRH-UHFFFAOYSA-N 0.000 description 4
- 239000002245 particle Substances 0.000 description 4
- -1 polyethylene Polymers 0.000 description 4
- DNIAPMSPPWPWGF-GSVOUGTGSA-N (R)-(-)-Propylene glycol Chemical compound C[C@@H](O)CO DNIAPMSPPWPWGF-GSVOUGTGSA-N 0.000 description 3
- 239000004698 Polyethylene Substances 0.000 description 3
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 239000001913 cellulose Substances 0.000 description 3
- 229920002678 cellulose Polymers 0.000 description 3
- 235000014113 dietary fatty acids Nutrition 0.000 description 3
- 239000000194 fatty acid Substances 0.000 description 3
- 229930195729 fatty acid Natural products 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 239000011087 paperboard Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920000573 polyethylene Polymers 0.000 description 3
- 239000005871 repellent Substances 0.000 description 3
- 239000000344 soap Substances 0.000 description 3
- 238000006136 alcoholysis reaction Methods 0.000 description 2
- 125000005313 fatty acid group Chemical group 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000009776 industrial production Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 125000000218 acetic acid group Chemical group C(C)(=O)* 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 235000013361 beverage Nutrition 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000011247 coating layer Substances 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 239000000839 emulsion Substances 0.000 description 1
- 150000004665 fatty acids Chemical class 0.000 description 1
- 235000013305 food Nutrition 0.000 description 1
- 125000002887 hydroxy group Chemical group [H]O* 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000005012 migration Effects 0.000 description 1
- 238000013508 migration Methods 0.000 description 1
- 231100000252 nontoxic Toxicity 0.000 description 1
- 230000003000 nontoxic effect Effects 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000012466 permeate Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/385—Oxides, hydroxides or carbonates
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/38—Coatings with pigments characterised by the pigments
- D21H19/40—Coatings with pigments characterised by the pigments siliceous, e.g. clays
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/50—Proteins
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/52—Cellulose; Derivatives thereof
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/54—Starch
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H19/00—Coated paper; Coating material
- D21H19/36—Coatings with pigments
- D21H19/44—Coatings with pigments characterised by the other ingredients, e.g. the binder or dispersing agent
- D21H19/56—Macromolecular organic compounds or oligomers thereof obtained by reactions only involving carbon-to-carbon unsaturated bonds
- D21H19/60—Polyalkenylalcohols; Polyalkenylethers; Polyalkenylesters
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/08—Dispersing agents for fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/06—Paper forming aids
- D21H21/12—Defoamers
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Dispersion Chemistry (AREA)
- Paper (AREA)
Abstract
The invention provides a precoating liquid for moisture-resistant coated paper, which comprises the following components: an adhesive, a mineral; the adhesive is at least one of the following: starch, latex, polyvinyl alcohol, chitosan, carboxymethyl cellulose CMC, casein and protein; the mineral is at least one of the following: heavy calcium carbonate, light calcium carbonate, kaolin, talcum powder and mica powder. The invention also provides a preparation method and application of the pre-coating liquid for the moisture-resistant coated paper. The precoating liquid for the wet-resistant coated paper can be used for precoating the wet-resistant base paper by widely used conventional coating technical equipment, can effectively improve the film forming integrity and uniformity of the wet-resistant coated paper, reduce the dosage of the water-based wet-resistant coating liquid and improve the wet-resistant performance of the wet-resistant coated paper; and simultaneously improves the glossiness and heat sealing performance of the moisture-resistant coated paper and the folding-resistant and antiknock performance of the precoating liquid after drying.
Description
Technical Field
The invention relates to the technical field of coated paper, in particular to a precoating liquid for moisture-resistant coated paper, a preparation method and application thereof.
Background
Under the requirements of plastic reduction and plastic replacement in the packaging industry, paper and paperboard are paid attention as a nontoxic, low-cost and excellent biodegradable material, and the trend is gradually growing from paper to plastic.
Because of the special working environment in the industries of food and the like, the moisture-resistant coated paper is required to have moisture-resistant performance, so that permeation of cold and hot liquids such as water, oil coffee, beverages and the like is prevented. Meanwhile, the wet-resistant coated paper is required to have good overall degradation or recovery performance, so that the wet-resistant coated paper after use is recycled and treated.
The existing preparation method of the moisture-resistant coated paper generally comprises the steps of directly coating a water-based coating with moisture-resistant performance on the surface of moisture-resistant base paper or paperboard so as to obtain a paper product with the moisture-resistant performance. However, since the moisture-resistant base paper itself is made of fibers containing long-chain cellulose molecules, and has a porous structure formed by interlacing fiber networks. On the one hand, cellulose itself is rendered hydrophilic by the hydroxyl groups contained in the cellulose base unit; on the other hand, because of the porosity of the fiber network formed by interweaving fibers, a plurality of gaps exist among the fibers, so that the surface flatness of the moisture-resistant base paper is inconsistent; the combination of the problems results in that when the moisture-resistant base paper is coated with the water-based moisture-resistant coating, the water-based moisture-resistant coating can largely permeate into the moisture-resistant base paper or the paperboard, and the formed moisture-resistant coating has the following problems: the coating thickness is uneven, the film forming of the coating is incomplete, and pinholes or coating leakage are easy to form on the coating; the method not only causes waste of the water-based moisture-resistant coating liquid and improves the production cost of the moisture-resistant coated paper, but also seriously affects the moisture-resistant performance of the moisture-resistant coated paper.
The inventor finds that before the moisture-resistant base paper is coated with the water-based moisture-resistant coating, the pre-coating liquid for the moisture-resistant coated paper is adopted to pre-coat the moisture-resistant base paper, so that the pre-coating liquid has an important effect on the moisture-resistant coated paper, the film forming integrity and uniformity of the moisture-resistant coated paper can be effectively improved, the dosage of the water-based moisture-resistant coating liquid is reduced, the moisture-resistant performance of the moisture-resistant coated paper is improved, and the like.
Although the prior art discloses a technical scheme for pre-coating the base paper, the prior art does not aim at improving the film forming integrity and uniformity of the wet-resistant coated paper, reducing the dosage of the water-based wet-resistant coating liquid and improving the wet-resistant performance of the wet-resistant coated paper.
Chinese patent CN102220727B discloses a coated paper and a method for manufacturing the same, which uses a coating mechanism in a paper machine to apply surface sizing to a base paper to form a sizing layer, and coats a precoating coating on the surface of the base paper to form a precoating layer, so that the coated paper has a higher bulk; however, this patent does not address improving the barrier properties of the paper.
Chinese patent CN103821029B discloses an oxygen-resistant and moisture-resistant coated paper and a method for preparing the same, which comprises arranging an ink layer, a moisture-resistant layer and an oxygen-resistant layer on the surface of a base paper in sequence. The ink layer is equivalent to a precoating coating layer, but does not substantially contribute to the improvement of the moisture resistance of the paper, and does not substantially improve the film forming property of the moisture resistance layer and the oxygen resistance layer of the paper, the dosage of the coating liquid and the like.
Chinese patent CN1323766C discloses a method for producing a multilayer coated substrate with improved barrier properties, which employs a composite multilayer free-flowing coating curtain to impart various barrier functions to paper including moisture barrier, but which does not pre-coat the base paper, etc.; and the multilayer coating curtain has high requirements on equipment, high production cost and great popularization difficulty, and does not meet the requirements of large-scale industrial production.
Furthermore, the existing wet-resistant coated paper has the problems of unsatisfactory glossiness and heat sealing performance, and the folding-resistant and antiknock performance of the pre-coating liquid for the wet-resistant coated paper after being dried is still to be further improved.
Therefore, the precoating liquid for the wet-resistant coated paper, which can precoat the wet-resistant base paper by widely used conventional coating technical equipment, can effectively improve the film forming integrity and uniformity of the wet-resistant coated paper, reduce the dosage of the water-based wet-resistant coating liquid and improve the wet-resistant performance of the wet-resistant coated paper; and simultaneously improves the glossiness and heat sealing performance of the moisture-resistant coated paper and the folding-resistant and antiknock performance of the pre-coating liquid after drying, and has important significance on the moisture-resistant coated paper.
Disclosure of Invention
In order to solve the technical problems in the prior art, the invention provides the precoating liquid for the wet-resistant coated paper, the preparation method and the application thereof, which can be used for precoating the wet-resistant base paper by widely used conventional coating technical equipment, can effectively improve the film forming integrity and uniformity of the wet-resistant coated paper, reduce the dosage of the water-based wet-resistant coating liquid and improve the wet-resistant performance of the wet-resistant coated paper; and simultaneously improves the glossiness and heat sealing performance of the moisture-resistant coated paper and the folding-resistant and antiknock performance of the precoating liquid after drying.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows:
a precoating liquid for moisture-resistant coated paper, comprising: an adhesive, a mineral;
the adhesive is at least one of the following: starch, latex, polyvinyl alcohol, chitosan, carboxymethyl cellulose CMC, casein and protein;
the mineral is at least one of the following: heavy calcium carbonate, light calcium carbonate, kaolin, talcum powder and mica powder.
Preferably, the diameter-thickness ratio of the kaolin is more than or equal to 25; the diameter-thickness ratio of the talcum powder is more than or equal to 25; the diameter-thickness ratio of the mica powder is more than or equal to 25.
Preferably, the weight of the adhesive is 0.1-2.5 times of the weight of the minerals.
More preferably, the weight of the adhesive is 1.25-2 times the weight of the mineral.
More preferably, the weight of the adhesive is 2 times the weight of the mineral.
Further, the starch is one of the following: corn starch, tapioca starch, oxidized starch, cationic starch, and oil-resistant starch.
Further, the latex is one of the following: styrene-butadiene latex, acrylic latex, acetic acid latex.
Preferably, the alcoholysis degree of the polyvinyl alcohol is more than or equal to 98 percent, and the polymerization degree is more than or equal to 500.
Preferably, the average particle size of the heavy calcium carbonate and the light calcium carbonate is less than or equal to 2 mu m.
Further, the precoating liquid for the moisture-resistant coated paper can also comprise a conventional coating auxiliary agent;
the coating auxiliary agent is at least one of the following: lubricant, defoamer, thickener and dispersant.
The lubricant is one of the following: stearate type lubricants, fatty acid soap type lubricants, and polyethylene wax type lubricants.
The defoamer is polyether defoamer or higher aliphatic alcohol defoamer.
The preparation method of the precoating liquid for the moisture-resistant coated paper comprises the steps of adding minerals and deionized water into a dispersing machine for dispersing; after the dispersion is completed, adding an adhesive and a coating auxiliary agent to continue the dispersion, and adjusting the water content of the pre-coating liquid to be 50-70% to prepare the pre-coating liquid for the moisture-resistant coated paper;
the coating auxiliary agent is at least one of the following: lubricant, defoamer, thickener and dispersant.
The application of the precoating liquid for the wet-resistant coated paper adopts the precoating liquid for the wet-resistant coated paper to pretreat the base paper for the wet-resistant coated paper, and then the precoating base paper is obtained; and then, carrying out moisture-resistant coating on the pre-coated base paper by adopting a water-based moisture-resistant agent to prepare the moisture-resistant coated paper.
Further, the pretreatment comprises sizing and pre-coating which are sequentially carried out;
the sizing adopts starch as sizing agent to size the base paper for the moisture-resistant coated paper, and at least one calendering is carried out after sizing;
and the pre-coating adopts a pre-coating liquid to pre-coat the base paper for the wet-resistant coated paper after sizing.
Preferably, the sizing agent is used in an amount of 1-5g/m 2 。
Preferably, in the pre-coating, the dosage of the pre-coating liquid is 6-15g/m 2 。
After the technical scheme is adopted, compared with the prior art, the invention has the beneficial effects that:
1. the precoating liquid for the moisture-resistant coated paper can effectively penetrate into the base paper, and forms a layer of uniform and smooth precoating film on the surface of the base paper while closing the gap of the base paper; in the preparation of the moisture-resistant coated paper by matching with the conventional water-based moisture-resistant agent, the migration of the water-based moisture-resistant agent is effectively reduced, the dosage of the water-based moisture-resistant agent is reduced, and the thickness uniformity of the moisture-resistant coating is improved; the precoating liquid for the wet-resistant coated paper can be used for precoating the wet-resistant base paper through widely used conventional coating technical equipment, and can effectively improve the film forming integrity and uniformity of the wet-resistant coated paper, reduce the dosage of the water-based wet-resistant coating liquid and improve the wet-resistant performance of the wet-resistant coated paper; and simultaneously improves the glossiness and heat sealing performance of the moisture-resistant coated paper and the folding-resistant and antiknock performance of the precoating liquid after drying.
2. The precoating liquid for the wet-resistant coated paper is matched with a conventional water-based wet-resistant agent to be applied to the preparation of the wet-resistant coated paper, and the prepared wet-resistant coating on the surface of the wet-resistant coated paper has the advantages of complete film formation, uniform thickness of the wet-resistant coating and no pinhole or missing coating phenomenon; moisture barrier coated paper vaporThe transmission rate can reach 50g/m 2 24h, the oil resistance Kit value can reach 12, and the water absorption value (120 s) can reach 0.2g/m 2 。
3. After the base paper for the moisture-resistant coated paper with the smoothness of 3-5S and the roughness of 6-8 mu m is pre-coated by adopting the pre-coating liquid for the moisture-resistant coated paper, the smoothness of the pre-coated base paper is 20-80S, and the roughness is 2-5 mu m.
4. The precoating liquid for the moisture-resistant coated paper has the advantages of low-cost and easily-obtained raw materials, simple preparation and application methods, easy control of the process, convenient popularization and promotion by adopting conventional traditional equipment, and meeting the requirements of large-scale industrial production.
5. The precoating liquid for the wet-resistant coated paper is applied to the preparation of the wet-resistant coated paper, can effectively reduce the dosage of the conventional water-based wet-resistant agent, can reduce raw material consumption and production cost while guaranteeing the wet-resistant performance; compared with the precoating liquid for the moisture-resistant coated paper, which is not used for precoating, the dosage of the moisture-resistant agent can be effectively reduced.
Detailed Description
The following description of the preferred embodiments of the present invention is provided for the purpose of illustration and explanation only and is not intended to limit the present invention.
Example 1
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is styrene-butadiene latex.
The mineral is talcum powder, and the diameter-thickness ratio of the talcum powder is 25.
The coating auxiliary agent is a defoaming agent and a lubricant.
The defoamer is polyether defoamer.
The lubricant is stearate lubricant.
The weight ratio of the styrene-butadiene latex to the talcum powder to the defoamer to the lubricant is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: adding talcum powder and deionized water into a dispersing machine, and uniformly dispersing; then adding styrene-butadiene latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 65 percent to prepare the pre-coating liquid for the moisture-resistant coated paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by a film transfer sizing machine, and calendaring is performed by a calendar. The starch dosage in the sizing is 3g/m 2 。
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a sizing machine. The dosage of the precoating liquid in precoating is 10g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 5g/m 2 (oven dry material).
The precoating liquid for the wet-resistant coated paper of the embodiment is adopted to precoat the base paper for the wet-resistant coated paper, and then the base paper is combined with the conventional water-based wet-resistant agent (acrylic ester copolymer) to prepare the wet-resistant coating on the surface of the wet-resistant coated paper, the film formation of the wet-resistant coating is complete, the thickness of the wet-resistant coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-resistant coated paper is 80g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 0.6g/m 2 。
Further, it was detected that the base paper for moisture-resistant coated paper had a smoothness of 4S and a roughness of 6.5. Mu.m; the pre-coated base paper after pre-coating had a smoothness of 60S and a roughness of 3 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 9g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent to be used by 44.4 wt%.
Example 2
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is acrylic latex.
The mineral is talcum powder, and the diameter-thickness ratio of the talcum powder is 26.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is fatty acid soap lubricant.
The defoaming agent is a higher aliphatic alcohol defoaming agent.
The weight ratio of the styrene-butadiene latex to the talcum powder to the defoamer to the lubricant is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: adding talcum powder and deionized water into a dispersing machine, and uniformly dispersing; then adding acrylic latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 65 percent to prepare the pre-coating liquid for the moisture-resistant coating paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by a film transfer sizing machine, and calendaring is performed by a calendar. The starch dosage in the sizing is 5g/m 2 。
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is carried out by adopting a calendar, and precoating is carried out by adoptingThe coating machine. The dosage of the precoating liquid in precoating is 6g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 7g/m 2 (oven dry material).
The precoating liquid for the wet-resistant coated paper of the embodiment is adopted to precoat the base paper for the wet-resistant coated paper, and then the base paper is combined with the conventional water-based wet-resistant agent (acrylic ester copolymer) to prepare the wet-resistant coating on the surface of the wet-resistant coated paper, the film formation of the wet-resistant coating is complete, the thickness of the wet-resistant coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-resistant coated paper is 50g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 0.2g/m 2 。
Further, the base paper for the moisture-resistant coated paper was detected to have a smoothness of 5S and a roughness of 6 μm; the pre-coated base paper after pre-coating had a smoothness of 80S and a roughness of 2 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 12g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent to be used by 41.7 wt%.
Example 3
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is styrene-butadiene latex.
The mineral is heavy calcium carbonate, and the average particle size of the heavy calcium carbonate is 2 μm.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is polyethylene wax lubricant.
The defoamer is polyether defoamer.
The ratio of the styrene-butadiene latex to the heavy calcium carbonate to the defoamer to the lubricant in parts by weight is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: heavy calcium carbonate and deionized water are put into a dispersing machine to be dispersed uniformly; then adding styrene-butadiene latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 55% to prepare the pre-coating liquid for the moisture-resistant coating paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by a film transfer sizing machine, and calendaring is performed by a calendar. The starch dosage in the sizing is 5g/m 2 。
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a coater. The dosage of the precoating liquid in precoating is 15g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 4g/m 2 (oven dry material).
The precoating liquid for the wet-proof coated paper of the embodiment is adopted to precoat the base paper for the wet-proof coated paper, and then the base paper is combined with the conventional water-based wet-proof agent (acrylic ester copolymer) to prepare the wet-proof coating on the surface of the wet-proof coated paper, the film formation of the wet-proof coating is complete, the thickness of the wet-proof coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-proof coated paper is 105g/m 2 24h, oil repellency Kit value of12, the water absorption value (120 s) is 1.1g/m 2 。
Further, it was detected that the base paper for moisture-resistant coated paper had a smoothness of 3S and a roughness of 7. Mu.m; the pre-coated base paper after pre-coating had a smoothness of 50S and a roughness of 5 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 8g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent by 50 wt%.
Example 4
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is styrene-butadiene latex.
The mineral is light calcium carbonate, and the average particle size of the light calcium carbonate is 1.8 μm.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is stearate lubricant.
The defoamer is polyether defoamer.
The ratio of the styrene-butadiene latex to the light calcium carbonate to the defoamer to the lubricant in parts by weight is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: adding light calcium carbonate and deionized water into a dispersing machine, and uniformly dispersing; then adding styrene-butadiene latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 60 percent to prepare the pre-coating liquid for the moisture-resistant coating paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by adopting a soaking type sizing machine, and calendaring is performed by adopting a calendaring machine. The starch amount in the sizing was 3g/m2.
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a coater. The dosage of the precoating liquid in precoating is 12g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 5g/m 2 (oven dry material).
The precoating liquid for the wet-resistant coated paper of the embodiment is adopted to precoat the base paper for the wet-resistant coated paper, and then the base paper is combined with the conventional water-based wet-resistant agent (acrylic ester copolymer) to prepare the wet-resistant coating on the surface of the wet-resistant coated paper, the film formation of the wet-resistant coating is complete, the thickness of the wet-resistant coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-resistant coated paper is 130g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 1.3g/m 2 。
Further, the base paper for the moisture-resistant coated paper was detected to have a smoothness of 3S and a roughness of 8 μm; the smoothness of the pre-coated base paper after pre-coating was 40S and the roughness was 5 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 7g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent by 28.6 wt%.
Example 5
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is acetic acid latex.
The mineral is talcum powder, and the diameter-thickness ratio of the talcum powder is 29.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is stearate lubricant.
The defoamer is polyether defoamer.
The weight ratio of the acetic acid emulsion to the talcum powder to the defoamer to the lubricant is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: adding light calcium carbonate and deionized water into a dispersing machine, and uniformly dispersing; then adding styrene-butadiene latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 65 percent to prepare the pre-coating liquid for the moisture-resistant coated paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by adopting a soaking type sizing machine, and calendaring is performed by adopting a calendaring machine. The starch amount in the sizing was 4g/m2.
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a coater. The amount of the precoating liquid used in the precoating was 7g/m2.
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 6g/m 2 (oven dry material).
The base paper for the wet-repellent coated paper was pre-coated with the pre-coating liquid for the wet-repellent coated paper of this example, and then was mixed with a conventional aqueous wet-repellent agent (acrylic ester co-agentPolymer) and the prepared moisture-resistant coating on the surface of the moisture-resistant coated paper has complete film formation, uniform thickness of the moisture-resistant coating, no pinhole or coating leakage phenomenon, and the water vapor transmission rate of the moisture-resistant coated paper is 60g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 0.8g/m 2 。
Further, the smoothness of the base paper for the moisture-resistant coated paper is 5S and the roughness is 6.5 μm after detection; the pre-coated base paper after pre-coating had a smoothness of 75S and a roughness of 3 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 10g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent by 40 wt%.
Example 6
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is acrylic latex and polyvinyl alcohol; the weight ratio of the acrylic latex to the polyvinyl alcohol is 2:1.
The alcoholysis degree of polyvinyl alcohol was 98% and the polymerization degree was 500.
The mineral is talcum powder, and the diameter-thickness ratio of the talcum powder is 26.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is fatty acid soap lubricant.
The defoaming agent is a higher aliphatic alcohol defoaming agent.
The weight ratio of the styrene-butadiene latex to the talcum powder to the defoamer to the lubricant is 100:50:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: adding talcum powder and deionized water into a dispersing machine, and uniformly dispersing; then adding acrylic latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 65 percent to prepare the pre-coating liquid for the moisture-resistant coating paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1. sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by a film transfer sizing machine, and calendaring is performed by a calendar. The starch dosage in the sizing is 5g/m 2 。
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a coater. The dosage of the precoating liquid in precoating is 7g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 6g/m 2 (oven dry material).
The precoating liquid for the wet-proof coated paper of the embodiment is adopted to precoat the base paper for the wet-proof coated paper, and then the base paper is combined with the conventional water-based wet-proof agent (acrylic ester copolymer) to prepare the wet-proof coating on the surface of the wet-proof coated paper, the film formation of the wet-proof coating is complete, the thickness of the wet-proof coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-proof coated paper is 61g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 0.5g/m 2 。
Further, it was detected that the base paper for moisture-resistant coated paper had a smoothness of 4S and a roughness of 7. Mu.m; the pre-coated base paper after pre-coating had a smoothness of 70S and a roughness of 4 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 12g/m 2 (oven dry material); namely, the precoating for moisture-resistant coated paper according to this exampleThe liquid distribution can reduce the dosage of 50wt% of the moisture inhibitor.
Example 7
The precoating liquid for wet-proof coated paper consists of adhesive, mineral and coating assistant.
Wherein the adhesive is styrene-butadiene latex.
The mineral is heavy calcium carbonate, and the average particle size of the heavy calcium carbonate is 2 μm.
The coating auxiliary agent is a defoaming agent and a lubricant.
The lubricant is polyethylene wax lubricant.
The defoamer is polyether defoamer.
The ratio of the styrene-butadiene latex to the heavy calcium carbonate to the defoamer to the lubricant in parts by weight is 15:100:0.1:0.3.
The precoating liquid for the moisture-resistant coated paper is prepared by the following method: heavy calcium carbonate and deionized water are put into a dispersing machine to be dispersed uniformly; then adding styrene-butadiene latex, a defoaming agent, a lubricant and deionized water, continuing to uniformly disperse, and controlling the water content of the pre-coating liquid to be 55% to prepare the pre-coating liquid for the moisture-resistant coating paper.
The application of the precoating liquid for the moisture-resistant coated paper comprises the following specific steps:
1 sizing
The starch is used as sizing agent to size the base paper for the moisture-resistant coated paper, and the primary calendaring is carried out after the sizing.
In the sizing process, sizing is performed by a film transfer sizing machine, and calendaring is performed by a calendar. The starch dosage in the sizing is 2g/m 2 。
2. Pre-coating
And pre-coating the base paper for the wet-resistant coated paper after sizing by adopting a pre-coating liquid to obtain the pre-coated base paper.
In the precoating process, calendaring is performed by a calendar, and precoating is performed by a coater. The dosage of the precoating liquid in precoating is 15g/m 2 。
3. Moisture barrier coating
And (3) adopting acrylic ester copolymer as a water-based moisture-resistant agent, and carrying out moisture-resistant coating on the pre-coated base paper to prepare the moisture-resistant coated paper.
In the embodiment, the water-based moisture inhibitor is acrylic ester copolymer HPB4130, and the manufacturer is Basoff chemical industry Co., ltd; the dosage of the water-based moisture inhibitor is 8g/m 2 (oven dry material).
The precoating liquid for the wet-resistant coated paper of the embodiment is adopted to precoat the base paper for the wet-resistant coated paper, and then the base paper is combined with the conventional water-based wet-resistant agent (acrylic ester copolymer) to prepare the wet-resistant coating on the surface of the wet-resistant coated paper, the film formation of the wet-resistant coating is complete, the thickness of the wet-resistant coating is uniform, no pinholes or coating leakage phenomenon exists, and the water vapor transmission rate of the wet-resistant coated paper is 95g/m 2 24h, oil repellency Kit value of 12, water absorption value (120 s) of 0.85g/m 2 。
Further, it was detected that the base paper for moisture-resistant coated paper had a smoothness of 3S and a roughness of 7. Mu.m; the pre-coated base paper after pre-coating had a smoothness of 25S and a roughness of 6 μm.
Further, according to the test, the base paper for the wet-stop coated paper was not pre-coated with the pre-coating liquid for the wet-stop coated paper of the present example, and the amount of the aqueous wet-stop agent was 10g/m 2 (oven dry material); that is, the use of the precoating liquid for moisture-resistant coated paper of this example can reduce the amount of the moisture-resistant agent to 20 wt%.
The percentages used in the present invention are mass percentages unless otherwise indicated.
Finally, it should be noted that: the foregoing description is only a preferred embodiment of the present invention, and the present invention is not limited thereto, but it is to be understood that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art, although the present invention has been described in detail with reference to the foregoing embodiments. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. The precoating liquid for the wet-resistant coated paper is characterized by comprising the following components: an adhesive, a mineral;
the adhesive is at least one of the following: starch, latex, polyvinyl alcohol, chitosan, carboxymethyl cellulose CMC, casein and protein;
the mineral is at least one of the following: heavy calcium carbonate, light calcium carbonate, kaolin, talcum powder and mica powder.
2. The precoating liquid for moisture-resistant coated paper according to claim 1, wherein the weight of the adhesive is 0.1 to 2.5 times the weight of the mineral.
3. The precoating liquid for moisture-resistant coated paper according to claim 1, wherein the starch is one of the following: corn starch, tapioca starch, oxidized starch, cationic starch, and oil-resistant starch.
4. The precoating liquid for moisture-resistant coated paper according to claim 1, wherein the latex is one of the following: styrene-butadiene latex, acrylic latex, acetic acid latex.
5. The precoating liquid for moisture-resistant coated paper according to claim 1, wherein the kaolin has a radial thickness ratio of not less than 25; the diameter-thickness ratio of the talcum powder is more than or equal to 25; the diameter-thickness ratio of the mica powder is more than or equal to 25.
6. A method for preparing the precoating liquid for moisture-resistant coated paper according to claims 1 to 5, characterized in that minerals and deionized water are put into a dispersing machine for dispersion; after the dispersion is completed, adding an adhesive and a coating auxiliary agent to continue the dispersion, and adjusting the water content of the pre-coating liquid to be 50-70% to prepare the pre-coating liquid for the moisture-resistant coated paper;
the coating auxiliary agent is at least one of the following: lubricant, defoamer, thickener and dispersant.
7. Use of the precoating liquid for moisture-resistant coated paper according to claims 1 to 5, wherein the precoating base paper for moisture-resistant coated paper is obtained after pretreatment of the base paper for moisture-resistant coated paper with the precoating liquid for moisture-resistant coated paper; and then, carrying out moisture-resistant coating on the pre-coated base paper by adopting a water-based moisture-resistant agent to prepare the moisture-resistant coated paper.
8. The use of a precoating liquid for wet-stop coated paper according to claim 7, wherein the pretreatment comprises sizing, precoating, and the like performed in this order;
the sizing adopts starch as sizing agent to size the base paper for the moisture-resistant coated paper, and at least one calendering is carried out after sizing;
and the pre-coating adopts a pre-coating liquid to pre-coat the base paper for the wet-resistant coated paper after sizing.
9. The use of a precoating liquid for wet-stop coated paper according to claim 8, wherein the sizing agent is used in an amount of 1 to 5g/m in the sizing 2 。
10. The use of a precoating liquid for wet-stop coated paper according to claim 8, wherein in the precoating, the precoating liquid is used in an amount of 6 to 15g/m 2 。
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