CN101962921B - Method for improving efficiency of fluorescent whitening agent in high yield pulp-containing paper - Google Patents
Method for improving efficiency of fluorescent whitening agent in high yield pulp-containing paper Download PDFInfo
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- CN101962921B CN101962921B CN2010102895643A CN201010289564A CN101962921B CN 101962921 B CN101962921 B CN 101962921B CN 2010102895643 A CN2010102895643 A CN 2010102895643A CN 201010289564 A CN201010289564 A CN 201010289564A CN 101962921 B CN101962921 B CN 101962921B
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Abstract
The invention discloses a method for improving the efficiency of fluorescent whitening agent in high yield pulp-containing paper, which comprises the following steps: weighing mixed pulp; mechanically stirring; adding aqueous solution of fluorescent whitening agent, aqueous solution of light calcium carbonate, aqueous solution of cationic polyacrylamide and aqueous solution of cationic starch in turn, and mixing uniformly; making sheets on a standard sheet machine; and squeezing by a squeezing machine, transferring to an environment at constant temperature and constant humidity, and drying for 24 hours. The method of the invention can improve the efficiency of the fluorescent whitening agent in the high yield pulp-containing paper; after the cationic starch is added, particularly 0.8 to 1.2 percent of cationic starch is added, the D65 whiteness of the paper is increased by 0.5 to 0.7 unit, CIE whiteness 2 to 3 units, and fluorescence content 1 percent, compared with those of a reference sample without additional cationic starch. The method of the invention is simple in process, low in production cost and highly compatible with wet-end chemicals.
Description
Technical field
The invention belongs to the Pulp and Paper Engineering technical field, be specifically related to a kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper.
Background technology
High yield pulp; Be bleached chemical thermomechanical pulp (BCTMP), few with high yield, the pollution of its manufacture process, can give into paper a lot of functional advantages are provided; Good etc. like high bulk, high-stiffness, printability, in various paper and cardboard, obtained in recent years using widely.But; With respect to bleached kraft pulp; High yield pulp is because the existence of lignin and other coloring matters makes it have certain yellow hue, and the whiteness of slurry is relatively low, so the raising of high yield pulp whiteness has received the extensive concern of industrial quarters and research field.Fluorescent whitening agent can absorbing wavelength invisible ultraviolet light of naked eyes under 300-400nm; Can launch wavelength macroscopic bluish violet fluorescence under 420-480nm after exciting; The original yellowing tone of this blue-violet light and paper is complementary; Strengthen the visual sense light quantity of total reflection light simultaneously, thereby increase the white sense of paper, be widely used in paper making wet part to improve into the whiteness of paper.But in wet end chemistry interpolation process, the interaction of fluorescent whitening agent and cationic auxiliary can make the fluorescent whitening agent generation extinguish effect, reduces its functioning efficiency; In addition, also can reduce the performance of fluorescent whitening agent efficient owing to the existence of materials such as lignin, anionic trash in the high yield pulp.For example add 20% high yield pulp, the fluorescent whitening agent consumption will increase about 50% with respect to not containing the high yield pulp paper stock, so the raising of fluorescent whitening agent efficient in containing the high yield pulp paper stock is extremely important.The raising of fluorescent whitening agent efficient not only can reduce the fluorescent whitening agent consumption, thereby reduces the whole anionic trash content of copying paper system, practices thrift the addition of cationic polymer; But also can reduce owing to excessive fluorescent whitening agent adds the green point effect that brings, improve into the printability of paper.Therefore, the raising of fluorescent whitening agent efficient all can play a positive role to the control of whole wet end chemistry production cost and the raising of quality of finished paper.
Summary of the invention
The objective of the invention is to overcome the deficiency that exists in the prior art, a kind of method of raising fluorescent whitening agent efficient in containing the high yield pulp paper stock of easy and simple to handle, technological specification is provided.
Technical scheme of the present invention is summarized as follows:
A kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper comprises the steps:
Measure mixed slurry; Mechanical agitation; Be that 10-60s adds aqueous solutions of optical brighteners that mass concentration is 0.1%-1.2%, the precipitated calcium carbonate aqueous solution that mass concentration is 10%-30%, the PAMC aqueous solution that mass concentration is 0.02%-0.1% successively and be made into mass concentration earlier in the time interval be that 5%-20% is then at 90 ℃ of following gelatinization 30min; Being diluted with water to mass concentration is the cationic starch aqueous solution of 0.2%-2.0%, mixes, and on the standard handshcet former, copies sheet; The squeezer squeezing is transferred to constant temperature and humidity drying 24h; Said mixed slurry is 1 with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.1%-1.2%: 10%-30%: 0.02%-0.1%: 0.2%-2.0%; Said mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to the needlebush bleached kraft pulp of the 10%-50% of Canadian Standard Freeness 500-560mL, in the PFI mill, pull an oar and discongest to the leaf wood bleached kraft pulp of the 20%-65% of Canadian Standard Freeness 300-500mL and in standard that to discongest in the device to freedom be the high yield pulp of the 10%-50% of 250-400mL, said fluorescent whitening agent is a disulfonic acid type fluorescent whitening agent.
Method of the present invention can improve the efficient of fluorescent whitening agent in containing high yield pulp paper; After adding cationic starch; After particularly adding the cationic starch of 0.8%-1.2%, with respect to the control samples of not adding cationic starch, the D65 whiteness has increased 0.5-0.7 unit; The CIE whiteness has increased 2-3 unit, and fluorescence content has improved 1%.
Method technology of the present invention is simple, production cost is low, compatible strong with wet-end chemicals.
The specific embodiment
With reference to the following example will be more easily, more fully understand the present invention, provide embodiment and be in order to illustrate the present invention, rather than limit the present invention by any way.
Embodiment 1
A kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper comprises the steps:
Measure and be equivalent to oven dry stock 1.2g mixed slurry; Mechanical agitation; In the time interval is that to add mass concentration successively be that 0.2% aqueous solutions of optical brighteners, mass concentration are that 30% the precipitated calcium carbonate aqueous solution, mass concentration are 0.05% the PAMC aqueous solution and to be made into mass concentration earlier be 10% then at 90 ℃ of following gelatinization 30min to 30s; It is even to be diluted with water to mass concentration and to be 0.2% cationic starch aqueous solution; On the standard handshcet former, copy sheet, the squeezer squeezing is transferred to constant temperature and humidity drying 24h; With Elrepho spectrophotometer measurement page optical property.Mixed slurry is 1: 0.2%: 30% with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.05%: 0.2%;
Mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 35% the needlebush bleached kraft pulp of Canadian Standard Freeness 560mL, in the PFI mill, pull an oar and discongest to 55% the leaf wood bleached kraft pulp of Canadian Standard Freeness 500mL and in standard that to discongest in the device to freedom be 10% the high yield pulp of 325mL, the fluorescent whitening agent of present embodiment is a disulfonic acid type fluorescent whitening agent.
Adopt the method identical again with embodiment 1; Using mixed slurry and cationic starch dry weight ratio respectively is that the ratio of 1: 0.4%, 1: 0.8%, 1: 1.2% and 1: 2.0% is mixed with the corresponding aqueous solution to substitute mixed slurry be 1: 0.2% with cationic starch dry weight ratio; Other material and proportioning are copied sheet, squeezing, drying and performance measurement with embodiment 1 under identical condition;
Adopt with above identical method, be blank not add the cationic starch aqueous solution, under identical condition, copy sheet, squeezing, drying and performance measurement.
Cationic starch is seen table 1 to the raising effect that contains high yield pulp paper stock fluorescent whitening agent efficient; Increase along with the cationic starch consumption; The D65 whiteness of page, CIE whiteness and fluorescence content are all in rising trend; As under 10% high yield pulp content, 0.2% fluorescent whitening agent consumption, the D65 whiteness is increased to 92.7% (2.0% cationic starch) from 92.0% (no cationic starch adds); The CIE whiteness has increased by 2.7 units, and fluorescence content has increased by 1%.
The raising (10% high yield pulp) of table 1 cationic starch consumption to containing fluorescent whitening agent efficient in the high yield pulp paper
Embodiment 2
A kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper is with the high yield pulp (freedom is with embodiment 1) of 10% in 20% the high yield pulp alternate embodiment 1; With the leaf wood bleached kraft pulp (freedom is with embodiment 1) of 55% in 45% the leaf wood bleached kraft pulp alternate embodiment 1, other is with embodiment 1;
Cationic starch is seen table 2 to the raising effect that contains high yield pulp paper stock fluorescent whitening agent efficient; Under 20% high yield pulp content; 0.2% fluorescent whitening agent consumption, the D65 whiteness is increased to 91.2% (2.0% cationic starch) from 90.4% (no cationic starch adds); The CIE whiteness has increased by 2.2 units, and fluorescence content has increased by 0.9%.
The fluorescent whitening agent of present embodiment is a disulfonic acid type fluorescent whitening agent.
The raising (20% high yield pulp) of table 2 cationic starch consumption to containing fluorescent whitening agent efficient in the high yield pulp paper
Annotate: high yield pulp content is 20%, needlebush bleached kraft pulp content 35%, leaf wood bleached kraft pulp content 45%.Fluorescent whitening agent consumption 0.2%, precipitated calcium carbonate consumption 30%, PAMC consumption 0.05%.
Embodiment 3 different fluorescent whitening agent additions are to containing the influence of high yield pulp paper stock fluorescent whitening agent efficient
Measure and be equivalent to oven dry stock 1.2g mixed slurry; Mechanical agitation; In the time interval is that to add mass concentration successively be that 0.2% aqueous solutions of optical brighteners, mass concentration are that 30% the precipitated calcium carbonate aqueous solution, mass concentration are 0.05% the PAMC aqueous solution and to be made into mass concentration earlier be 10% then at 90 ℃ of following gelatinization 30min to 30s; It is even to be diluted with water to mass concentration and to be 1.2% cationic starch aqueous solution; On the standard handshcet former, copy sheet, the squeezer squeezing is transferred to constant temperature and humidity drying 24h; With Elrepho spectrophotometer measurement page optical property.Mixed slurry is 1: 0.2%: 30% with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.05%: 1.2%;
Said mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 35% the needlebush bleached kraft pulp of Canadian Standard Freeness 560mL, in the PFI mill, pull an oar and discongest to 55% the leaf wood bleached kraft pulp of Canadian Standard Freeness 500mL and in standard that to discongest in the device to freedom be 10% the high yield pulp of 325mL.
Adopt the method identical again with present embodiment; Using mixed slurry and fluorescent whitening agent dry weight ratio respectively is that 1: 0.4%, 1: 0.8% and 1: 1.2% ratio are mixed with the corresponding aqueous solution and substitute 0.2% aqueous solutions of optical brighteners, under identical condition, copies sheet, squeezing, drying and performance measurement;
Adopt with above identical method, do not add aqueous solutions of optical brighteners for blank, under identical condition, copy sheet, squeezing, drying and performance measurement.
Cationic starch is seen table 3 to the raising effect that contains high yield pulp paper stock fluorescent whitening agent efficient; Under the fluorescent whitening agent consumption of 0.2%-1.2%; Cationic starch can both improve the efficient of fluorescent whitening agent effectively, and the page that promptly adds cationic starch has higher D65 whiteness, CIE whiteness and fluorescence content.
The fluorescent whitening agent of present embodiment is a disulfonic acid type fluorescent whitening agent.
The raising (10% high yield pulp) of table 3 fluorescent whitening agent consumption to containing fluorescent whitening agent efficient in the high yield pulp paper
Annotate: high yield pulp content is 10%, needlebush bleached kraft pulp content 35%, leaf wood bleached kraft pulp content 55%.Precipitated calcium carbonate consumption 30%, PAMC consumption 0.05%, cationic starch consumption 1.2%.
Embodiment 4 cationic starches are to containing the influence of high yield pulp page physical property
Measure and be equivalent to oven dry stock 1.2g mixed slurry; Mechanical agitation; In the time interval is that to add mass concentration successively be that 0.2% aqueous solutions of optical brighteners, mass concentration are that 30% the precipitated calcium carbonate aqueous solution, mass concentration are 0.05% the PAMC aqueous solution and to be made into mass concentration earlier be 10% then at 90 ℃ of following gelatinization 30min to 30s; It is even to be diluted with water to mass concentration and to be 0.2% cationic starch aqueous solution; On the standard handshcet former, copy sheet, the squeezer squeezing is transferred to constant temperature and humidity drying 24h; Measure the optical property and the physical property of page;
Mixed slurry is 1: 0.2%: 30% with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.05%: 0.2%;
Mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 35% the needlebush bleached kraft pulp of Canadian Standard Freeness 560mL, in the PFI mill, pull an oar and discongest to 55% the leaf wood bleached kraft pulp of Canadian Standard Freeness 500mL and in standard that to discongest in the device to freedom be 10% the high yield pulp of 325mL.
Adopt the method identical again with present embodiment; Using mixed slurry and cationic starch dry weight ratio respectively is that the ratio of 1: 0.4%, 1: 0.8%, 1: 1.2% and 1: 2.0% is mixed with the corresponding aqueous solution and substitutes 0.2% the cationic starch aqueous solution, under identical condition, copies sheet, squeezing, drying and performance measurement;
Adopt with above identical method, do not add the cationic starch aqueous solution for blank, under identical condition, copy sheet, squeezing, drying and performance measurement, the result sees table 4.Cationic starch has improved the tensile index and the anti-energy absorption of opening of page, has improved the internal bond strength of page, and tear index has reduction slightly.
The fluorescent whitening agent of present embodiment is a disulfonic acid type fluorescent whitening agent.
Table 4 cationic starch is to the influence (10% high yield pulp) of page physical property
Embodiment 5
A kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper comprises the steps:
Measure and be equivalent to oven dry stock 1.2g mixed slurry; Mechanical agitation; In the time interval is that to add mass concentration successively be that 0.1% aqueous solutions of optical brighteners, mass concentration are that 10% the precipitated calcium carbonate aqueous solution, mass concentration are 0.1% the PAMC aqueous solution and to be made into mass concentration earlier be 5% then at 90 ℃ of following gelatinization 30min to 10s; Be diluted with water to mass concentration and be 0.2% the cationic starch aqueous solution, mix, on the standard handshcet former, copy sheet; The squeezer squeezing is transferred to constant temperature and humidity drying 24h; Said mixed slurry is 1: 0.1%: 10% with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.1%: 0.2%; Said mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 50% the needlebush bleached kraft pulp of Canadian Standard Freeness 500mL, in the PFI mill, pull an oar and discongest to 30% the leaf wood bleached kraft pulp of Canadian Standard Freeness 300mL and in standard that to discongest in the device to freedom be 20% the high yield pulp of 250mL.
Fluorescent whitening agent in the present embodiment is a tetrasulfonic acid type fluorescent whitening agent.
The experiment proof; The method of present embodiment can improve the efficient of fluorescent whitening agent effectively; The D65 whiteness of page and CIE whiteness, fluorescence content have obtained effectively improving, the internal bond strength raising of the page of producing with method of the present invention, and tear index has reduction slightly.
Embodiment 6
A kind of method that improves fluorescent whitening agent efficient in containing high yield pulp paper comprises the steps:
Measure and be equivalent to oven dry stock 1.2g mixed slurry; Mechanical agitation; In the time interval is that to add mass concentration successively be that 1.2% aqueous solutions of optical brighteners, mass concentration are that 20% the precipitated calcium carbonate aqueous solution, mass concentration are 0.02% the PAMC aqueous solution and to be made into mass concentration earlier be 20% then at 90 ℃ of following gelatinization 30min to 60s; Be diluted with water to mass concentration and be 2.0% the cationic starch aqueous solution, mix, on the standard handshcet former, copy sheet; The squeezer squeezing is transferred to constant temperature and humidity drying 24h; Said mixed slurry is 1: 1.2%: 20% with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.02%: 2.0%; Said mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 10% the needlebush bleached kraft pulp of Canadian Standard Freeness 530mL, in the PFI mill, pull an oar and discongest to 65% the leaf wood bleached kraft pulp of Canadian Standard Freeness 400mL and in standard that to discongest in the device to freedom be 25% the high yield pulp of 400mL.
Fluorescent whitening agent in the present embodiment is a tetrasulfonic acid type fluorescent whitening agent.
The experiment proof; The method of present embodiment can improve the efficient of fluorescent whitening agent effectively; The D65 whiteness of page and CIE whiteness, fluorescence content have obtained effectively improving, the internal bond strength raising of the page of producing with method of the present invention, and tear index has reduction slightly.
Embodiment 7
Mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to 30% the needlebush bleached kraft pulp of Canadian Standard Freeness 530mL, in the PFI mill, pull an oar and discongest to 20% the leaf wood bleached kraft pulp of Canadian Standard Freeness 400mL and in standard that to discongest in the device to freedom be 50% the high yield pulp of 400mL, other is with embodiment 1.
The experiment proof; The method of present embodiment can improve the efficient of fluorescent whitening agent effectively; The D65 whiteness of page and CIE whiteness, fluorescence content have obtained effectively improving, the internal bond strength raising of the page of producing with method of the present invention, and tear index has reduction slightly.
Precipitated calcium carbonate (PCC), U.S. Albacar HO company produces;
Disulfonic acid type fluorescent whitening agent, Tinopal HW, vapour Bagong department produces;
PAMC (CPAM), Perco1292, vapour Bagong department produces;
Cationic starch, C253, substitution value 0.03, Roquette Freres produces.
The present invention that the experiment proof adopts the raw material of other commercial above-mentioned title to accomplish also can equally produce identical effect with each embodiment.
Claims (1)
1. method that improves fluorescent whitening agent efficient in containing high yield pulp paper; Its characteristic comprises the steps: to measure mixed slurry; Mechanical agitation; Be that 10-60s adds aqueous solutions of optical brighteners that mass concentration is 0.1%-1.2%, the precipitated calcium carbonate aqueous solution that mass concentration is 10%-30%, the PAMC aqueous solution that mass concentration is 0.02%-0.1% successively and be made into mass concentration earlier in the time interval be that 5%-20% is then at 90 ℃ of following gelatinization 30min; Being diluted with water to mass concentration is the cationic starch aqueous solution of 0.2%-2.0%, mixes, and on the standard handshcet former, copies sheet; The squeezer squeezing is transferred to constant temperature and humidity drying 24h; Said mixed slurry is 1 with the dry weight ratio of fluorescent whitening agent, precipitated calcium carbonate, PAMC and cationic starch: 0.1%-1.2%: 10%-30%: 0.02%-0.1%: 0.2%-2.0%; Said mixed slurry is made up of following raw material by mass percentage: in PFI mill, pull an oar to the needlebush bleached kraft pulp of the 10%-50% of Canadian Standard Freeness 500-560mL, in the PFI mill, pull an oar and discongest to the leaf wood bleached kraft pulp of the 20%-65% of Canadian Standard Freeness 300-500mL and in standard that to discongest in the device to freedom be the high yield pulp of the 10%-50% of 250-400mL, said fluorescent whitening agent is a disulfonic acid type fluorescent whitening agent.
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| CN102286897B (en) * | 2011-05-17 | 2013-01-16 | 天津科技大学 | Coated box board or coated kraft liner and method for producing same at low cost |
| CN102839570A (en) * | 2012-08-07 | 2012-12-26 | 金华盛纸业（苏州工业园区）有限公司 | Body paper of photographic paper, and preparation method thereof |
| CN104420382B (en) * | 2013-08-28 | 2016-08-17 | 天津科技大学 | Containing anionic trash control method in high yield pulp mixed slurry |
| CN103614943B (en) * | 2013-12-04 | 2016-01-20 | 天津科技大学 | Reduce the method for fluorescent brightener levels in paper manufacturing systems |
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| CN85102827A (en) * | 1985-04-01 | 1986-09-10 | 大连工学院 | The compounding method of water dispersion slurry dyestuff |
| EP0899373A1 (en) * | 1997-08-28 | 1999-03-03 | Ciba SC Holding AG | Method of whitening lignin-containing pulp during manufacture |
| US6893473B2 (en) * | 2002-05-07 | 2005-05-17 | Weyerhaeuser.Company | Whitened fluff pulp |
| CN101128630A (en) * | 2005-02-19 | 2008-02-20 | 国际纸业公司 | Fixation of optical brightening agents onto papermaking fiber |
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