CN101760991B - Paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and coating method - Google Patents
Paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and coating method Download PDFInfo
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- CN101760991B CN101760991B CN2010101279061A CN201010127906A CN101760991B CN 101760991 B CN101760991 B CN 101760991B CN 2010101279061 A CN2010101279061 A CN 2010101279061A CN 201010127906 A CN201010127906 A CN 201010127906A CN 101760991 B CN101760991 B CN 101760991B
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Abstract
The invention relates to a paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and a coating application method. The paint is coated on the surface of raw paper with the high-yield bleaching pulp. In addition to kaolin and calcium carbonate pigment conventionally used, titanium dioxide pigment which can absorb ultraviolet light is introduced in the paint, so as to reduce the yellow discoloration of paper with the high-yield bleaching pulp. The paper with the high-yield bleaching pulp produced by the invention has a low degree of yellow discoloration, and the color difference (delta E) is no higher than 3 after the paper is irradiated by ultraviolet light for 10 hours. Therefore, the paper fundamentally reaches the level of complete chemical pulp. Moreover, the method is simple, the raw materials are easily available, and the operating performance is good.
Description
Technical field
The invention belongs to the pulping and paper-making field, relate in particular to a kind of coating and coating process that reduces yellow discoloration of paper with high-yield bleaching pulp.
Background technology
The bleaching high yield pulp has advantages such as high opacity, high bulk and low production cost, and therefore the application in pulp and paper industry is increasingly extensive.The bleaching high yield pulp comprises bleaching Alkaline Peroxide Mechanical Pulp (APMP and PRC-APMP), bleached chemical thermomechanical pulp (BCTMP), various bleaching semi-chemical pulp (HCP) etc.But owing to kept a large amount of lignins in the high yield bleached pulp, lignin can absorb ultraviolet light and cause the body paper whiteness instability made, and with prolonging and flavescence (yellowing) standing time, this is the disadvantage of high yield bleached pulp easily.
By retrieval, find that technology related to the present invention comprises: 1, patent " is utilized the brightness reversion of nitroxide and other common additive inhibition of pulp and paper " (CN1270580), this Patent publish a kind of paper pulp or paper that comprises lignin, especially chemical machinery or thermo-mechanical pulp or paper, when they comprise the bulky amine compound of effective stable quantity, anti-brightness reversion with enhancing, described compound are preferably nitroxide, azanol or its ammonium salt.2, patent " reduces the method for rate of photoyellowing " (CN101326327), this patent disclosure a kind of method that in containing the paper of mechanical pulp, reduces rate of photoyellowing, it comprises: the aqueous solution that will comprise one or more rhodanates of effective dose is applied on the page surface of paper technology.3, patent " a kind of method of stable pulp brightness " (CN101182693), kowtow forebay, white water chest, join and add diethylene triamine pentacetic acid (DTPA) (DTPA) in the stock tank by alcaliotropism hydrogen peroxide mechanical pulp respectively, the metal ion that exists in the masking system reaches the purpose of stable Alkaline Peroxide Mechanical Pulp (APMP slurry) color and luster.
The technical characterictic that above-mentioned 3 pieces of patent documentations are put down in writing has the different of essence with present patent application.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art part, provide a kind of and can effectively reduce coating and the coating process that contains the yellowing of high yield bleached pulp paper, this method is to be coated with on the body paper surface that contains high yield bleached pulp, introduce the TiO 2 pigment that can absorb ultraviolet light in the coating especially, thereby reduced the yellowing of the paper that contains high yield bleached pulp.
The objective of the invention is to be achieved through the following technical solutions:
A kind of reduction contains the yellowing coating of bleaching high yield pulp paper, and it constitutes component and mass fraction is:
Kaolin: 5-90%
Calcium carbonate: 5-90%
Titanium dioxide: 3-10%
All the other add auxiliary material to 100%.
And the particle diameter that is comprised in the described kaolin is no less than 90% less than the particle content of 2 μ m.
And described calcium carbonate is the powdered whiting of pulpous state or solid, and the particle diameter that it comprised is not less than 55% less than the particle content of 2 μ m.
And described titanium dioxide is nanoscale or micron-sized rutile-type or anatase titanium dioxide.
And described auxiliary material comprises dispersant, binding agent, fluorescent whitening agent, dyestuff, defoamer, lubricant, water retention agent, bactericide, and binding agent is that synthetic latex comprises carboxylic styrene butadiene latex or styrene-acrylic latex, or the starch of modification; Water retention agent is sodium carboxymethylcellulose or synthetic thickening agent; The binding agent consumption accounts for the 8-20% of coating total amount; The fluorescent whitening agent consumption is 0.1～1.0%; Dye dosage is 0.01～0.5%, and dispersant, defoamer, lubricant, water retention agent, bactericide, alkali consumption are 0.1～1.0%.
A kind of reduction contains the coating process of the yellowing of bleaching high yield pulp paper, and step is:
(1) dispersion liquid preparation
Add water in disperser, start agitator, rotating speed rises to 4000-8000r/min, add dispersant and pigment, dispersant dosage is the 0.1-1% of total amount, and pigment is kaolin, powdered whiting or titanium dioxide, the solid content of dispersion liquid is 50-70%, and jitter time is 20-100min;
(2) preparation coating
Rate of dispersion is reduced to 200～4000r/min, add other auxiliary materials in dispersion liquid, adjusting the pH value with alkali is 8.0～10.0, and jitter time is 10～100min, and the coating solid content is 30～68%, and the pH value is 8.0～10.0;
(3) bodystock paper
Coating is applied on the body paper, and coating method is in the machine or outside the machine, adopts the coating of scraper or curtain formula, and coating weight is 5～40g/m
2, single or double coating is through conventional drying, press polish, batch, obtain the very low body paper of yellowing rate after the rewinding.
And described kaolin, powdered whiting, titanium dioxide mix and disperse, and mix after perhaps disperseing separately again.
And the content of bleaching high yield pulp is 10～40% in the body paper, and all the other are bleached chemical needle slurry, bleached chemical broad-leaved slurry and filler.
Advantage of the present invention and good effect are:
1, the present invention effectively reduces the yellowing phenomenon that contains the paper of bleaching high yield pulp, make the application of this class paper more extensive, expand to high culture paper from traditional paperboard, paperboard, and the paper of producing has good bulk and opacity, be beneficial to printing, write.
2, the present invention has improved and has bleached the consumption of high yield chemical pulp in paper, can save limited timber resources, reduces the pollution of slurrying to environment simultaneously.
3, production method of the present invention is easy, and conventional equipment can meet the demands, and raw material (as kaolin, calcium carbonate, titanium dioxide etc.) obtains easily, and the coating of preparation has good transportation performance, and is easy to use.
4, the paper of bleaching high yield pulp that contains that the present invention produces has very low yellowing characteristics, can reach the level of full chemical pulp; And method is easy, raw material is easy to get, operating characteristics is good; The yellowing rate that contains the paper of high yield bleached pulp can reach the yellowing rate level of the paper that full chemical pulp produces, promptly pass through ultra violet lamp 10h after, aberration (Δ E) is no more than 3.
The specific embodiment
Below in conjunction with embodiment, the present invention is further described, and following embodiment is illustrative, is not determinate, can not limit protection scope of the present invention with following embodiment.
Embodiment 1:
A kind of reduction contains the coating of the paper yellowing of bleaching high yield pulp, and it constitutes component and weight percentage ranges is:
Kaolin, U.S. 1# soil, pressed powder: 15%;
Powdered whiting, particle diameter accounts for 90% less than the particle of 2 μ m, pressed powder: 60%;
Titanium dioxide (rutile-type or anatase titanium dioxide, particle diameter can be nanoscale or micron order): 10%
Auxiliary material: 15%; Comprise in the auxiliary agent that the carboxylic styrene butadiene latex consumption is 13%, the fluorescent whitening agent consumption is 0.29%, and blue dyes consumption 0.01%, defoamer consumption are 0.5%, and lubricant quantity is 0.5%, and the water retention agent consumption is 0.5%, and the bactericide consumption is 0.2%.
The coating process that a kind of reduction contains the paper yellowing of bleaching high yield pulp is:
(1) dispersion liquid preparation
Add water to 1/2 place in disperser, start agitator, rotating speed rises to 8000r/min, adds polyacrylic acid dipersant and pigment; The kaolin consumption is 15%, and the powdered whiting consumption is 60%, rutile titanium dioxide (nanoscale, pulpous state, solid content are 60%) consumption 10%., the particle diameter in the powdered whiting accounts for 90% less than the particle of 2 μ m, pressed powder; The solid content of dispersible pigment dispersion is 52%.Dispersant dosage is 1.0% of total pigment mass, jitter time 100min.
(2) preparation coating
Rate of dispersion is reduced to 4000r/min, with dispersible pigment dispersion and other auxiliary material mixing dispersions; Auxiliary material: the carboxylic styrene butadiene latex consumption is 13%, and the fluorescent whitening agent consumption is 0.29%, and blue dyes consumption 0.01%, defoamer consumption are 0.5%, and lubricant quantity is 0.5%, and the water retention agent consumption is 0.5%, and the bactericide consumption is 0.2%.Adjusting the pH value with alkali is 9.7.Jitter time is 80min, and the solid content that obtains coating is 35%.
(3) bodystock paper
Above-mentioned coating is applied on the body paper, promptly gets the yellowing rate after the drying and only be 2.3 body paper.Body paper is certain cultural paper, quantitatively is 65g/m
2, bleaching high yield pulp content is 12%.Coating method is in the machine, curtain formula, heated-air drying, double spread, and every coating weight is 7.8g/m
2The yellowing rate Δ E=2.3 of body paper, and the similar body paper yellowing rate that does not contain high yield pulp also is 2.3, the yellowing rate was 9 when similar body paper was handled without this method; Simultaneously, the bulk of this body paper is 1.5cm
3/ g, opacity is 87.4%, printing performance is good.
Embodiment 2:
A kind of reduction contains the method for the paper yellowing of bleaching high yield pulp, and step is:
(1) dispersion liquid preparation
Add water to 3/5 place in disperser, start agitator, rotating speed rises to 7200r/min, adds hexa metaphosphoric acid dipersant and pigment.Dispersant dosage is 0.6% (to total pigment mass), kaolin (homemade, pressed powder) consumption 11%, powdered whiting (particle diameter accounts for 65% less than the particle of 2 μ m, pulpous state, solid content 70%) consumption 68%, rutile titanium dioxide (common grade, Powdered) consumption 5%.The solid content of dispersion liquid is 60%, keeps the speed of 7200r/min, disperses 80min.
(2) preparation coating
Rate of dispersion is reduced to 2500r/min, add other auxiliary materials: the styrene-butadiene latex consumption is 15%, the fluorescent whitening agent consumption is 0.1%, blue dyes consumption 0.02%, the defoamer consumption is 0.25%, and lubricant quantity is 0.2%, and the water retention agent consumption is 0.28%, the bactericide consumption is 0.15%, and adjusting the pH value with alkali is 9.2.Jitter time is 40min, and the coating solid content is 53%.
(3) bodystock paper
This coating is applied on the body paper, and dry back body paper yellowing rate (Δ E) is 2.9.Body paper is certain packing board, quantitatively is 180g/m
2, bleaching high yield pulp content is 42%.Coating method is in the machine, scraper, Infrared Heating are air-dry dry, double spread, and every coating weight is 20g/m
2The yellowing rate was 13 when similar body paper was handled without this method, and the similar body paper yellowing rate that does not contain high yield pulp also is 2.8.Simultaneously, the bulk of this body paper is 1.4cm
3/ g, opacity is 94.1%, printing and packaging character are good.
Embodiment 3:
A kind of reduction contains the method for the paper yellowing of bleaching high yield pulp, and step is:
(1) dispersion liquid preparation
Add water to 2/3 place in disperser, start agitator, rotating speed rises to 5000r/min, adds hexa metaphosphoric acid dipersant and pigment.Dispersant dosage is 0.4% (to total pigment mass), kaolin is (homemade, pressed powder) consumption 5%, powdered whiting (particle diameter accounts for 55% less than the particle of 2 μ m, pulpous state, solid content 70%) consumption 72%, anatase titanium dioxide (Nano grade, pulpous state, solid content are 60%) consumption 6%, the solid content of dispersion liquid is 68%.The speed that keeps 5000r/min is disperseed 60min.
(2) preparation coating
Rate of dispersion is reduced to 3000r/min, add other auxiliary materials: the styrene-butadiene latex consumption is 10%, the fluorescent whitening agent consumption is 0.1%, blue dyes consumption 0.01%, defoamer consumption are 0.5%, and lubricant quantity is 0.6%, the water retention agent consumption is 0.2%, the bactericide consumption is 0.59%, starch consumption 5%, and adjusting the pH value with alkali is 9.0.Jitter time is 40min, and the coating solid content is 62%.
(3) bodystock paper
This coating is applied on the body paper, and dry back body paper yellowing rate (Δ E) is 2.8.Body paper is certain packing board, quantitatively is 240g/m
2, bleaching high yield pulp content is 36%.Coating method is in the machine, scraper, Infrared Heating are air-dry dry, double spread, and every coating weight is 20g/m
2The yellowing rate was 11 when similar body paper was handled without this method, and the similar body paper yellowing rate that does not contain high yield pulp is 2.8.Simultaneously, the bulk of this body paper is 1.4cm
3/ g, opacity is 93.7%, printing and packaging character are good.
Claims (8)
1. a reduction contains the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: it constitutes component and mass fraction is:
Kaolin: 5-90%
Calcium carbonate: 5-90%
Titanium dioxide: 3-10%
All the other add auxiliary material to 100%.
2. a kind of reduction according to claim 1 contains the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: the particle diameter that is comprised in the described kaolin is no less than 90% less than the particle content of 2 μ m.
3. a kind of reduction according to claim 1 contains the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: described calcium carbonate is the powdered whiting of pulpous state or solid, and the particle diameter that it comprised is not less than 55% less than the particle content of 2 μ m.
4. a kind of reduction according to claim 1 contains the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: described titanium dioxide is nanoscale or micron-sized rutile-type or anatase titanium dioxide.
5. a kind of reduction according to claim 1 contains the yellowing coating of bleaching high yield pulp paper, it is characterized in that: described auxiliary material comprises dispersant, binding agent, fluorescent whitening agent, dyestuff, defoamer, lubricant, water retention agent, bactericide, binding agent is that synthetic latex comprises carboxylic styrene butadiene latex or styrene-acrylic latex, or the starch of modification; Water retention agent is sodium carboxymethylcellulose or synthetic thickening agent; The binding agent consumption accounts for the 8-20% of coating total amount; The fluorescent whitening agent consumption is 0.1～1.0%; Dye dosage is 0.01～0.5%, and dispersant, defoamer, lubricant, water retention agent, bactericide, alkali consumption are 0.1～1.0%.
6. a reduction as claimed in claim 1 contains the coating process of the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: step is:
(1) dispersion liquid preparation
Add water in disperser, start agitator, rotating speed rises to 4000-8000r/min, add dispersant and pigment, dispersant dosage is the 0.1-1% of total amount, and pigment is kaolin, powdered whiting and titanium dioxide, the solid content of dispersion liquid is 50-70%, and jitter time is 20-100min;
(2) preparation coating
Rate of dispersion is reduced to 200～4000r/min, add other auxiliary materials in dispersion liquid, adjusting the pH value with alkali is 8.0～10.0, and jitter time is 10～100min, and the coating solid content is 30～68%, and the pH value is 8.0～10.0;
(3) bodystock paper
Coating is applied on the body paper, and coating method is in the machine or outside the machine, adopts the coating of scraper or curtain formula, and coating weight is 5～40g/m
2, single or double coating is through conventional drying, press polish, batch, obtain the very low body paper of yellowing rate after the rewinding.
7. a kind of reduction according to claim 6 contains the coating process of the yellowing coating of bleaching high yield pulp paper, and it is characterized in that: described kaolin, powdered whiting, titanium dioxide mix and disperses, and mixes after perhaps disperseing separately again.
8. a kind of reduction according to claim 6 contains the coating process of the yellowing coating of bleaching high yield pulp paper, it is characterized in that: the content of bleaching high yield pulp is 10～40% in the body paper, and all the other are bleached chemical needle slurry, bleached chemical broad-leaved slurry and filler.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2010101279061A CN101760991B (en) | 2010-03-19 | 2010-03-19 | Paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and coating method |
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| CN2010101279061A CN101760991B (en) | 2010-03-19 | 2010-03-19 | Paint for reduction of yellow discoloration of paper with high-yield bleaching pulp and coating method |
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| CN101760991B true CN101760991B (en) | 2011-08-31 |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102230302A (en) * | 2011-05-17 | 2011-11-02 | 天津科技大学 | Method for enhancing whiteness of coated paper or coated paper board with starch |
| CN102199897A (en) * | 2011-05-17 | 2011-09-28 | 天津科技大学 | High-whiteness coated paper coated by using raw paper with medium whiteness, coating method and coating |
| CN103321094B (en) * | 2013-07-03 | 2016-03-23 | 金华盛纸业（苏州工业园区）有限公司 | A kind of Copperplate board coating and application thereof |
| CN104343048A (en) * | 2013-07-27 | 2015-02-11 | 桐城市福润包装材料有限公司 | Paper coating liquid |
| CN104372711A (en) * | 2014-09-17 | 2015-02-25 | 安徽锦绣经纬编有限公司 | Pigment composition |
| CN104452442A (en) * | 2014-11-04 | 2015-03-25 | 广西大学 | Method for improving smoothness and surface strength of paper |
| CN106283852B (en) * | 2016-08-08 | 2017-12-26 | 山东东佳集团股份有限公司 | The preparation method of slurry papermaking titanium dioxide |
| CN106381756B (en) * | 2016-11-16 | 2018-02-02 | 中国林业科学研究院林产化学工业研究所 | A kind of suppression high yield pulp brightness reversion based on inorganic oxide is filled with slurry and its preparation and application |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757680A (en) * | 2005-11-02 | 2006-04-12 | 向梅芳 | White color pigment-Litai powder |
| CN101649587A (en) * | 2009-08-26 | 2010-02-17 | 天津科技大学 | Inclusion enriching-photocatalytic type air purification paper |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1757680A (en) * | 2005-11-02 | 2006-04-12 | 向梅芳 | White color pigment-Litai powder |
| CN101649587A (en) * | 2009-08-26 | 2010-02-17 | 天津科技大学 | Inclusion enriching-photocatalytic type air purification paper |
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