CN102199897A - High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating - Google Patents

High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating Download PDF

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Publication number
CN102199897A
CN102199897A CN2011101271365A CN201110127136A CN102199897A CN 102199897 A CN102199897 A CN 102199897A CN 2011101271365 A CN2011101271365 A CN 2011101271365A CN 201110127136 A CN201110127136 A CN 201110127136A CN 102199897 A CN102199897 A CN 102199897A
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China
Prior art keywords
coating
whiteness
paper
coated
parts
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Inventor
臧永华
李星龙
许英
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Tianjin University of Science and Technology
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Tianjin University of Science and Technology
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Priority to CN2011101271365A priority Critical patent/CN102199897A/en
Priority to PCT/CN2011/076000 priority patent/WO2012155378A1/en
Publication of CN102199897A publication Critical patent/CN102199897A/en
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    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/28—Colorants ; Pigments or opacifying agents
    • 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
    • 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
    • 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
    • D21H19/00—Coated paper; Coating material
    • D21H19/80—Paper comprising more than one coating
    • D21H19/82—Paper comprising more than one coating superposed
    • D21H19/822—Paper comprising more than one coating superposed two superposed coatings, both being pigmented
    • 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
    • D21H21/14—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 characterised by function or properties in or on the paper
    • D21H21/30—Luminescent or fluorescent substances, e.g. for optical bleaching

Abstract

The invention relates to high-whiteness coated paper coated by using raw paper with medium whiteness, a coating method and a coating. The coating method is mainly characterized by greatly reducing the whiteness of the raw paper for producing conventional high-grade coated paper such as copper plate paper and coated white cardboards. The coating mode is a common single-side or double-side two-layer (double-coating) or multi-layer coating mode in a papermaking plant. By using the mechanical property of the raw paper, the printing property of coatings and the synergetic whitening effect between the coatings, yellowing of the raw paper is inhibited, and the whiteness of the coated paper is improved to over 86 percent so as to meet the requirements of national standards on the high-grade copper plate paper. The raw paper of the high-grade coated paper can be made by using various kinds of environment-friendly and resource-saving pulp of medium whiteness more widely, and is favorable for promoting the development of the low-carbon manufacturing technology of the pulping papermaking industry. The newly invented coated paper can substitute the traditional high-grade paper such as the copper plate paper, the coated white cardboards and the like in the fields of printing and packing.

Description

High-whiteness coated paper and the coating process and the used coating of the body paper coating of medium whiteness
Technical field
The invention belongs to the pulping and paper-making field, especially a kind of high-whiteness coated paper and coating process and used coating of body paper coating of medium whiteness.
Background technology
High-grade high-quality coated paper is generally selected high whiteness (being commonly referred to as high brightness in the world) bodystock paper production for use.For example, when the production whiteness satisfies the high-quality art paper of national high-quality art paper requirement (GB/T 7974-2002 whiteness is higher than 86%), its body paper whiteness (being brightness) is common and art paper is similar, generally about 85%, sometimes even up to 95%, slurry therewith is mainly bleach chemical pulp, and its whiteness generally is not less than 88%.This body paper has good intensity and optical property, but cost is also higher.
The contaminated wastewater owner of paper industry to derive from boiling and the bleaching two workshop sections, boiling and the bleaching mainly be for delignification to obtain the paper pulp of high whiteness.Whiteness is high more, bleaches difficultly more, and particularly when high whiteness, whiteness of every raising just need roll up the consumption of chemicals, has increased the cost of high whiteness paper pulp greatly.
The whiteness of coated paper not only depends on bodystock paper, also depends on the whiteness and the coating weight of coating.For in be coated with paper and recoat paper such as two-layer and multi-layer coated paper, primary coat makes coating more remarkable than body paper to the influence of coated paper whiteness to the covering power of body paper.But coating weight too high (as stone paper) may make paper become fragile.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, high-whiteness coated paper and the coating process and the used coating of the body paper coating of the medium whiteness that a kind of cost is low, mechanical property is good are provided, and the coated paper that is coated with out has that higher bulk, mechanical strength, coating cover evenly, surface smoothness is high and advantage such as printability is good.
The present invention realizes that the technical scheme of purpose is as follows:
A kind of coating process of high-whiteness coated paper of body paper coating of medium whiteness, the whiteness of bodystock paper are 55～83%, through the whiteness 86-120% of coating back coated paper.
And the step of described coating is as follows:
(1) join that to copy bodystock paper standby, or body paper is standby after applying glue or slight press polish;
(2) adopt bottom-coating to implement primary coat, two-sided or single face coating, every coating weight is 7～15g/m 2
(3) adopt painting coating enforcement face to be coated with, two-sided or single face coating, every coating weight is 7～15g/m 2
(4) will carry out press polish or processing through the paper of twice coating, obtain high-whiteness coated paper,
Described bottom-coating comprises that following composition and parts by weight are as follows:
10～90 parts of powdered whitings; 10～80 parts of kaolin;
5～20 parts of starch; 0～12 part of latex adhesive;
0～10 part of titanium dioxide,
Described painting coating comprise that following composition and parts by weight are as follows:
0.3～2.0 part of fluorescent whitening agent; 10～90 parts of powdered whitings;
10～80 parts of kaolin; 8～20 parts of latex adhesives;
0～1.5 part of polyvinyl alcohol or sodium carboxymethylcellulose.
And, one or more join and copy described body paper by bleach chemical pulp, BCTMP, APMP and the PRC-APMP of bleaching needlebush chemical pulp, bleaching leaf wood chemical pulp, medium whiteness, semi-chemical pulp, deinking recycled pulp, non-wood pulp, and whiteness is between 55%～83%.
And, be coated with between step (2) and step (3), carrying out, the composition of middle coating intermediate comprises: 10-90 part calcium carbonate, 10-80 part kaolin, 0-10 part titanium dioxide, 5-20 part starch, 0-12 latex, in the coating weight that is coated be 7～15g/m 2
A kind of high-whiteness coated paper, the high-whiteness coated paper that adopts the coating process of high-whiteness coated paper of the body paper production of above-mentioned medium whiteness to prepare, the whiteness 86-120% of high-whiteness coated paper.
The coating of the high-whiteness coated paper of a kind of body paper of medium whiteness coating comprises bottom-coating and painting coating, and described bottom-coating comprises that following composition and parts by weight are as follows:
30～80 parts of powdered whitings; 20～70 parts of kaolin;
5～15 parts of starch; 0～10 part of latex adhesive;
0～10 part of titanium dioxide,
Described painting coating comprise that following composition and parts by weight are as follows:
0.5～2.0 part of fluorescent whitening agent; 30～80 parts of powdered whitings;
20～70 parts of kaolin; 10～20 parts of latex adhesives;
0～1.5 part of polyvinyl alcohol or sodium carboxymethylcellulose.
And the solid content of described bottom-coating and painting coating is 55-68%.
And described latex adhesive is styrene-butadiene latex or styrene-acrylic latex or carboxylic styrene butadiene latex or acrylic compounds latex.
And, also comprise aid for paper making in described bottom-coating and the painting coating: dispersant, defoamer, lubricant, water retention agent, bactericide, crosslinking agent, water repellent agent, thickener, flexibilizer.
And, also comprise dyestuff in the described painting coating: 0～0.005 part of blue dyes, 0～0.005 part of cudbear.
Advantage of the present invention and good effect are as follows:
1, method provided by the invention greatly reduces the whiteness of producing conventional high grade coated paper such as art paper and the used body paper of coated white cardboard, coating method is constant, utilize mechanical property and the printing quality of coating and the synergic whitening effect between the coating of body paper, the brightness reversion that suppresses body paper, and the whiteness that makes coated paper is brought up to more than 86%, the pure chemistry slurry coated paper of its retention of whiteness and the coating of conventional kaolin calcium carbonate pigment is suitable, satisfies the requirement of national standard to high-grade art paper.
2, the present invention makes the body paper of high-whiteness coated paper can select the environmental friendliness of various medium whiteness more widely for use, the resource-conserving slurry is joined and is copied, the whiteness of used body paper is between 55%～83%, be significantly less than the whiteness (generally being higher than 85%) of common art base paper, body paper through single face or two-sided two-layer two be coated with or three layers of coating after obtain whiteness and be not less than 86% high-whiteness coated paper, help promoting the development of pulp and paper industry low-carbon (LC) manufacturing technology, the coated paper that this method is produced can replace art paper in the printing packaging field, traditional high whiteness paper such as coated white cardboard.
3, the present invention uses the body paper of medium whiteness to produce high-whiteness coated paper, make the slurry of body paper select for use scope to expand to high yield pulp such as APMP, PRC-APMP, deinking recycled pulp, semi-chemical pulp, the medium whiteness chemical pulp that hangs down the pollution bleaching and the non-wood pulp etc. of medium whiteness by traditional high whiteness bleaching needlebush and leaf wood chemical pulp, BCTMP slurry, effectively reduce the consumption and the bleaching energy consumption of bleaching chemical, reduce the wastewater treatment load, reduce production costs.
4, the coating of the coated paper of the present invention's production has the performance of good shielding ultraviolet rays, can suppress the brightness reversion of lignin in the body paper, can increase the content of high yield pulp in body paper, thereby saves timber resources, reduces cost of material.
5, the method among the present invention uses starch to replace partly or entirely expensive latex adhesive in primary coat, further reduced cost of material, pigment adopts paper mill pigment such as calcium carbonate, kaolin and titanium dioxide etc. commonly used to get final product, coating process is common two being coated with or three layers of coating process, production technology is simple, coated paper has higher bulk and mechanical strength, coating covers evenly, the surface smoothness height, printability is good, can replace traditional high-grade paper such as art paper, art post paperboard in the printing packaging field.
6, the present invention is with TiO 2With fluorescent whitening agent (OBA) layering use dexterously, TiO 2The background color and the part that are added in the primary coat to hide body paper increase whiteness, and OBA sends the brightness reversion that visible light realizes suppressing body paper by absorbing ultraviolet ray during then the face of being added on is coated with, and increases substantially the whiteness surveyed and the visual whiteness of coated paper.
7, the present invention in containing the coating of OBA, add PVA or CMC as water retention agent to reduce migration, PVA still is a kind of excellent carrier of OBA simultaneously, can improve OBA whitening effect and optical stability.Because OBA is water miscible, along with water evaporates and infiltration can be moved to surface and primary coat, a small amount of migration to the surface is favourable, and to the migration of primary coat OBA is mixed in TiO 2In and away from coating surface, its whitening effect can reduce.
8, the present invention has used cheap starch in replace latex as adhesive in primary coat and middle coating layer when satisfying strength of coating, and not only environmental protection but also reduce cost also can increase the whiteness of coated paper.The ratio that starch replaces latex is starch: latex=1.3-2: 1, often replace 1 part of latex among this patent embodiment with 1.5 parts of starch, simultaneously in amyloid coating, add water repellent agent,, also can stop the migration of OBA to body paper and primary coat coating to stop the migration of starch in body paper.
9, the present invention adds micro-blue dyes and cudbear to regulate the tone of coated paper in painting coating, finds in the research, and when producing the coated paper of identical whiteness, the tone that the use of micro-dyestuff can be regulated coated paper also can reduce the consumption of OBA.
The specific embodiment
Below in conjunction with embodiment technology contents of the present invention is described further; Following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
All raw materials are the commercially available prod in following examples, all belong to the paper grade (stock) chemicals, except that specified otherwise, indicate that the composition of function all has the generality of field of papermaking, do not have particularity, be techniques well known, do not list details, but all can not influence implementation of the present invention.Following examples relate to whiteness and are the whiteness that defines among the GB/T 7974-2002, and detection method does not have special implication with the record in the GB.
Embodiment 1
The method and the employed coating of the high-whiteness coated paper that the body paper of medium whiteness is produced, composition and step as:
(1) body paper of a kind of medium whiteness (about 74%), its slurry is formed and weight proportion is:
Alkaline Peroxide Mechanical Pulp (PRC-APMP): 30%, whiteness 69% (GB/T 7974-2002, down together);
Bleaching needlebush chemical pulp (NBKP): 30%, whiteness 88%;
Bleaching leaf wood chemical pulp (LBKP): 40%, whiteness 85%;
The body paper of being manufactured paper with pulp quantitatively is 100 ± 2g/m 2, whiteness is 74%, and is standby after the press polish.
(2) implement primary coat by apparatus for coating, double spread, every coating weight is 9～12g/m 2Formulation for coating material is as follows: (the coating solid content is about 60%, and all the other are that water (down with) pH is about 8.5)
Powdered whiting: 70 parts, 55 grades;
Kaolin: 30 parts, more than 90% less than 2 microns (mass fractions, down with);
Carboxylic styrene butadiene latex: 9 parts;
Starch: 10 parts, the coating level;
Water repellent agent: 0.5 part, the polyamide carbamide resin;
Titanium dioxide: 5 parts, micron order, rutile-type;
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.2 part, 0.02 part of defoamer (polyethylene glycol), lubricant (calcium stearate), 0.5 part.
(3) be coated with by apparatus for coating enforcement face, double spread, every coating weight is 11～14g/m 2This formulation for coating material is as follows: (coating solid content about 60%, pH is about 8.5)
Powdered whiting: 80 parts, 98 grades;
Particulate kaolin: 20 parts, more than 92% less than 2 microns;
Carboxylic styrene butadiene latex: 15 parts;
Fluorescent whitening agent: 1 part, tetrasulfonic acid type liquid brightener, (4S/6S type all can);
PVAC polyvinylalcohol: 1 part, the degree of polymerization 300～500;
Blue dyes (coated paper level): 0.004 part;
Cudbear (coated paper level): 0.003 part;
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.2 part; 0.02 part of defoamer (polyethylene glycol); Water repellent agent (polyamide carbamide resin), 0.5 part; Lubricant (calcium stearate), 0.5 part.
(4) will be through the paper of twice coating, carry out press polish and handle, it is about about 91% to obtain whiteness, and coating covers uniform high whiteness high grade coated paper.
(5) coating suppresses effect to the brightness reversion of PRC-APMP in the body paper:
Above-mentioned coated paper was shone in homemade ultraviolet light and aging case aging 6 hours, and the optical property of various coated papers is as follows:
The contrast of the different coated paper optical properties of table 1
Figure BDA0000061600400000041
Embodiment 2
The method and the employed coating of the high-whiteness coated paper that the body paper of medium whiteness is produced, composition and step as:
(1) slurry of body paper (whiteness is 80.5%) composition and weight proportion are:
Mechanical pulp (PRC-APMP): 20%, whiteness 74%;
The needlebush chemical pulp: 30%, whiteness 89%;
The leaf wood chemical pulp: 50%, whiteness 89%;
The body paper of being manufactured paper with pulp quantitatively is 100 ± 2g/m 2, whiteness is 80.5% (distilled water is copied sheet), and is standby after the press polish.
(2) be coated with primary coat coating by apparatus for coating, double spread, every coating weight is 9～12g/m 2This formulation for coating material is as follows: (coating solid content about 60%, pH is about 8.5)
Powdered whiting: 70 parts, 55 grades;
Kaolin: 30 parts, more than 90% less than 2 microns;
Carboxylic styrene butadiene latex: 8 parts;
Starch: 9 parts, the coating level;
Water repellent agent: 0.5 part; The polyamide carbamide resin
Titanium dioxide: 5 parts, micron order, rutile-type;
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.2 part; Defoamer (polyethylene glycol), 0.03 part; Lubricant (calcium stearate), 0.5 part.
(3) be coated with painting coating by apparatus for coating, double spread, every coating weight is 12～15g/m 2This formulation for coating material is as follows: (coating solid content about 60%, pH is transferred to 8.5)
Powdered whiting: 80 parts, 98 grades of slurry calcium;
Particulate kaolin: 20 parts, more than 92% less than 2 microns;
Carboxylic styrene butadiene latex: 15 parts;
Fluorescent whitening agent: 1 part, tetrasulfonic acid type liquid brightener;
Sodium carboxymethylcellulose CMC:1 part;
0.0030 part of blue dyes, cudbear: 0.0025 part,
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.2 part; Defoamer (polyethylene glycol), 0.03 part; Water repellent agent (polyamide carbamide resin), 0.5 part; Lubricant (calcium stearate), 0.5 part.
(4) will carry out press polish and handle through the paper of twice coating, obtain whiteness about 93%, cost is relatively low, and coating covers uniform art paper.
Embodiment 3
The method and the employed coating of the high-whiteness coated paper that the body paper of medium whiteness is produced, composition and step as:
(1) body paper (whiteness about 61%) of low whiteness in a kind of, its slurry is:
The needlebush chemical pulp, whiteness 62%.
Slurry is obtained behind hydrogen peroxide bleaching by the not bleaching needlebush chemical pulp of whiteness 24.0%.
The body paper of being manufactured paper with pulp quantitatively is 70 ± 2g/m 2, whiteness is 61%, and is standby after the press polish.
(2) be coated with primary coat coating by apparatus for coating, double spread, every coating weight is 12～15g/m 2This formulation for coating material is as follows: (coating solid content about 60%, pH is about 8.5)
Powdered whiting: 60 parts, 55 grades of slurry calcium;
Kaolin: 40 parts, more than 90% less than 2 microns;
Carboxylic styrene butadiene latex: 8 parts;
Starch: 9 parts, low viscosity, coating level;
Water repellent agent: 0.5 part, the polyamide carbamide resin;
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.3 part; Defoamer (polyethylene glycol), 0.02 part; Lubricant (calcium stearate), 0.5 part.
(3) apply painting coating by apparatus for coating, double spread, every coating weight is 12～15g/m 2This formulation for coating material is as follows: (coating solid content about 60%, pH is transferred to 8.5)
Powdered whiting: 80 parts, 98 grades of slurry calcium;
Particulate kaolin: 20 parts, more than 92% less than 2 microns;
Carboxylic styrene butadiene latex: 15 parts;
Fluorescent whitening agent: 1 part, tetrasulfonic acid type liquid brightener;
PVAC polyvinylalcohol: 0.8 part, the degree of polymerization 300～500;
Other auxiliary materials: dispersant (Sodium Polyacrylate), 0.5 part; Defoamer (polyethylene glycol), 0.02 part; Water repellent agent (polyamide carbamide resin), 0.3 part; Lubricant (calcium stearate), 0.5 part.
(4) the coated paper whiteness that obtains through twice coating is about 89%, the paper strength height, and coating covers evenly, and printability is good.
The foregoing description is and two is coated with coated paper, does not need the middle level coating.If whiteness and the exigent coated paper of retention of whiteness to coated paper can add 2 parts-10 parts rutile titanium dioxide in middle coating intermediate.Can adopt coated paper pigment commonly used such as calcium carbonate, kaolin, titanium dioxide, fluorescent whitening agent, starch, latex to mix formation according to different proportion in the middle coating intermediate with adhesive.Concrete composition as: the composition of middle coating intermediate is: coated paper pigment commonly used and adhesive such as 20-80 part calcium carbonate, 20-70 part kaolin, 0-10 part rutile titanium dioxide, 5-20 part starch, 0-12 latex, in the coating weight that is coated be 7～15g/m 2
In primary coat among the foregoing description 1-3 or the painting coating except that comprising above-mentioned functions component and coated paper pigment commonly used such as kaolin, calcium carbonate etc. and synthetic or natural polymer adhesive, also can add the flexibilizer of 0-1.5 part such as polyethylene glycol to reduce the fragility of thick coating, and other coating additives commonly used, as dispersant, defoamer, lubricant, water retention agent, bactericide, crosslinking agent, water repellent agent etc.
The coating weight of bottom-coating is 7～15g/m in the used various coating 2, in the coating weight that is coated be 7～15g/m 2, the coating weight of painting coating is 7～15g/m 2Can determine the coating number of times according to technical target of the product.Suitably adjust every layer of coating weight according to the coating number of times, the total coating weight of single face is at 15～45g/m 2
Principle of the present invention is as follows:
The invention provides the body paper of the medium whiteness of a kind of usefulness (being commonly referred to as brightness in the world), the high whiteness high grade coated paper and the production technology thereof of low-cost production.This patent is because join the whiteness of the art base paper of copying generally about 85% by bleaching needlebush chemical pulp (20-40%), bleaching leaf wood chemical pulp (40-80%), BCTMP slurry (0-20%) and filler traditionally with the whiteness about 83% the highest whiteness as medium whiteness body paper.But,, for example, then tear the not bleached fiber that exposes behind the coated paper and may make the people think that the class of this coated paper is lower not bleach kraft inner paper that the needlebush chemical pulp manufactures paper with pulp as bodystock paper if the whiteness of bodystock paper is low excessively.Comprehensive considering various effects and embodiment 3 experimental datas, this patent defines the whiteness of medium whiteness body paper between 55%～83%, is significantly less than the whiteness (generally being higher than 85%) of common high whiteness art base paper.The body paper of medium whiteness through single face or two-sided two-layer two be coated with or three layers of coating after obtain whiteness and be not less than 86% high grade coated paper.The body paper of selecting for use can comprise that the chemical pulp of APMP, PRC-APMP, BCTMP, the low medium whiteness of polluting bleaching or other slurries such as deinking recycled pulp and non-wood pulp join to copy by bleaching needlebush and leaf wood chemical pulp, high yield pulp and form.
In general, TiO in same page 2Can not use with OBA, because the principle that brightens of OBA is sent the visible light realization by absorbing ultraviolet ray, and TiO 2Can reduce the efficient that brightens of OBA greatly for ultraviolet competition absorption.The present invention is with the two layering use dexterously, TiO 2The background color and the part that are added in the primary coat to hide body paper increase whiteness, and OBA sends the brightness reversion that visible light realizes suppressing body paper by absorbing ultraviolet ray during then the face of being added on is coated with, and increases substantially the whiteness of coated paper.
According to the present invention, employed OBA is water miscible, along with water evaporates and infiltration can be moved to surface and primary coat.A small amount of migration to the surface is favourable, and to the migration of primary coat OBA is mixed in TiO 2In, its whitening effect can reduce.For this reason, we add PVA in containing the coating of OBA or CMC moves to reduce as water retention agent, and PVA still is a kind of excellent carrier of OBA simultaneously, can improve OBA whitening effect and optical stability.According to the present invention, can use cheap pigment (as 55 grades of calcium carbonate) and cheap environment-friendly type starch to replace part or all of latex adhesive in the bottom-coating to reduce cost of material.
The present invention has used cheap starch in replace latex as adhesive in primary coat and middle coating layer when satisfying strength of coating, and not only environmental protection but also reduce cost also can increase the whiteness of coated paper.The ratio that starch replaces latex is that 1.3-2 part starch replaces 1 part of latex.Simultaneously in amyloid coating, add water repellent agent,, also can stop the migration of OBA to body paper and primary coat coating to stop the migration of starch in body paper.
The present invention can add micro-blue dyes and cudbear to regulate the tone of coated paper in painting coating.Find in the research that when producing the coated paper of identical whiteness, the tone that the use of micro-dyestuff can be regulated coated paper also can reduce the consumption of OBA.

Claims (10)

1. the coating process of the high-whiteness coated paper of the body paper of medium whiteness coating, it is characterized in that: the whiteness of bodystock paper is 55～83%, through the whiteness 86-120% of coating back coated paper.
2. the coating process of the high-whiteness coated paper of the body paper of medium whiteness according to claim 1 coating, it is characterized in that: the step of described coating is as follows:
(1) join that to copy bodystock paper standby, or body paper is standby after applying glue or slight press polish;
(2) adopt bottom-coating to implement primary coat, two-sided or single face coating, every coating weight is 7～15g/m 2
(3) adopt painting coating enforcement face to be coated with, two-sided or single face coating, every coating weight is 7～15g/m 2
(4) will carry out press polish or processing through the paper of twice coating, obtain high-whiteness coated paper,
Described bottom-coating comprises that following composition and parts by weight are as follows:
10～90 parts of powdered whitings; 10～80 parts of kaolin;
5～20 parts of starch; 0～12 part of latex adhesive;
0～10 part of titanium dioxide,
Described painting coating comprise that following composition and parts by weight are as follows:
0.3～2.0 part of fluorescent whitening agent; 10～90 parts of powdered whitings;
10～80 parts of kaolin; 8～20 parts of latex adhesives;
0～1.5 part of polyvinyl alcohol or sodium carboxymethylcellulose.
3. the coating process of the high-whiteness coated paper of the body paper of medium whiteness according to claim 1 and 2 coating, it is characterized in that: one or more join and copy described body paper by bleaching needlebush chemical pulp, bleaching leaf wood chemical pulp, bleach chemical pulp, BCTMP, APMP and PRC-APMP, semi-chemical pulp and the deinking recycled pulp of medium whiteness, non-wood pulp, and whiteness is between 55%～83%.
4. the coating process of the high-whiteness coated paper of the body paper of medium whiteness according to claim 1 coating, it is characterized in that: be coated with between step (2) and step (3), carrying out, the composition of middle coating intermediate comprises: 10-90 part calcium carbonate, 10-80 part kaolin, 0-10 part titanium dioxide, 5-20 part starch, 0-12 latex adhesive, in the coating weight that is coated be 7～15g/m 2
5. a high-whiteness coated paper is characterized in that: the high-whiteness coated paper that the coating process of the high-whiteness coated paper of the body paper production of the described medium whiteness of the employing arbitrary claim of claim 1-4 prepares, the whiteness 86-120% of high-whiteness coated paper.
6. the coating of the high-whiteness coated paper of the body paper of medium whiteness coating comprises bottom-coating and painting coating, it is characterized in that:
Described bottom-coating comprises following composition and parts by weight:
10～90 parts of powdered whitings; 10～80 parts of kaolin;
5～20 parts of starch; 0～12 part of latex adhesive;
0～10 part of titanium dioxide,
Described painting coating comprise following composition and parts by weight:
0.3～2.0 part of fluorescent whitening agent; 10～90 parts of powdered whitings;
10～80 parts of kaolin; 8～20 parts of latex adhesives;
0～1.5 part of polyvinyl alcohol or sodium carboxymethylcellulose.
7. the coating of the high-whiteness coated paper of the body paper of medium whiteness according to claim 6 coating, it is characterized in that: the solid content of described bottom-coating and painting coating is 55-68%.
8. the coating of the high-whiteness coated paper of the body paper of medium whiteness according to claim 6 coating, it is characterized in that: described latex adhesive is styrene-butadiene latex or styrene-acrylic latex or polyacrylic latex.
9. the coating of the high-whiteness coated paper of the body paper of medium whiteness according to claim 6 coating, it is characterized in that: also comprise aid for paper making in described bottom-coating and the painting coating: dispersant, defoamer, lubricant, water retention agent, bactericide, crosslinking agent, water repellent agent, thickener, flexibilizer.
10. the coating of the high-whiteness coated paper of the body paper of medium whiteness according to claim 6 coating is characterized in that: also comprise dyestuff in the described painting coating: 0～0.005 part of blue dyes, 0～0.005 part of cudbear.
CN2011101271365A 2011-05-17 2011-05-17 High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating Pending CN102199897A (en)

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