CN103966886A - Papermaking technology - Google Patents
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- CN103966886A CN103966886A CN201310048007.6A CN201310048007A CN103966886A CN 103966886 A CN103966886 A CN 103966886A CN 201310048007 A CN201310048007 A CN 201310048007A CN 103966886 A CN103966886 A CN 103966886A
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Abstract
A papermaking technology comprises the following steps: performing mixing crosslinking on a boron-containing compound and a cationic high molecule to prepare a papermaking auxiliary agent; utilizing the papermaking auxiliary agent to perform pretreatment on a pulp containing a mechanical pulp; adding a filling material into the pulp subjected to pretreatment to prepare a mixed pulp; and utilizing the mixed pulp to make paper. Compared with the prior art, the provided papermaking technology is capable of substantially improving the retention rate of the filing material.
Description
Technical field
The present invention relates to a kind of paper technology.
Background technology
The production cost of the reduction paper continuing by improvement paper technology is the direction that field of papermaking is constantly pursued.By improving, paper technology improves the performance of paper and the cost of manufacturing paper with pulp of reduction paper is the direction of papermaking producer effort always.
Filler and fiber fines all play a part very important in paper-making process.Filler is mainly used to Substitute For Partial paper pulp fiber in paper-making process, thereby reduce the use amount of paper pulp fiber, reach with this object that reduces paper making cost, in paper pulp, the content of fiber fines directly affects the anti-tensile, folding, cohesive force of paper, resistance to broken, tear index, dry strong, the wet physical property such as strong.
Mechanical pulp, particularly chemi-mechanical pulp, mainly comprise Alkaline Peroxide Mechanical Pulp (APMP) and bleached chemi-mechanical pulp (BCTMP), containing proportional higher fiber fines.Therefore, mechanical pulp paper technology being transformed to improve fiber fines and filler retention is to reduce manufacture paper with pulp cost and improve a better approach of paper performance of mechanical pulp papermaking.
Summary of the invention
In view of this, providing a kind of paper technology and paper product that can improve filler retention is necessity in fact.
A kind of paper technology, it comprises the steps: boron-containing compound to mix with cation high molecular crosslinked with preparation paper making additive; Utilize described paper making additive to carry out preliminary treatment to the slurry that contains mechanical pulp; In the slurry through after above-mentioned preliminary treatment, add filler and mix slurry with preparation; And utilize described mixing to starch the paper of manufacturing paper with pulp.
Compared with prior art, above-mentioned paper technology provided by the present invention, it mixes boron-containing compound the paper making additive being cross-linked to form with cation high molecular, and utilize described paper making additive to carry out preliminary treatment to the slurry that contains mechanical pulp, afterwards to preparing and manufacture paper with pulp with mixing slurry through adding filler in pretreated slurry.By the way, can improve significantly fiber fines in slurry and the retention of filler.
Detailed description of the invention
The paper technology that embodiment of the present invention provides, it comprises the steps:
The paper technology that embodiment of the present invention provides, it comprises the steps: boron-containing compound to mix with cation high molecular crosslinked with preparation paper making additive; Described paper making additive is joined in the slurry that contains mechanical pulp so that slurry is carried out to preliminary treatment; In the pretreated slurry of described process, add filler with preparation mixing slurry; Utilize described mixing to starch the paper of manufacturing paper with pulp.
Next coming in order illustrate as follows to each step of above-mentioned paper technology provided by the present invention:
Boron-containing compound is mixed to the crosslinked step with preparation paper making additive with cation high molecular;
In this step, described boron-containing compound comprises boric acid and metal borate mineral, concrete, and described boron-containing compound can be one or more in boric acid, Boratex, Firebrake ZB, borax, raphite, boromagnesite, ludwigite and boracite.Described cation high molecular can be one or more in block, grafting and the derivative of cationic polysaccharide, amido high polymer, cationic polysaccharide and amido high polymer, wherein, described cationic polysaccharide comprises cationic cellulose and quaternary ammonium salt derivative, cation guar gum and quaternary ammonium salt derivative thereof, cationic starch, CATION sodium alginate and quaternary ammonium salt derivative, shitosan and quaternary ammonium salt derivative thereof etc., and described amido high polymer comprises cationic polyacrylamide, polyvinylamine, polymine.
Preferably, in the present embodiment, the molecular weight of described cation high molecular approximately 2,000 to 2,000,000, further, the molecular weight of described cation high molecular is 20,000 to 1,000,000.
Preferably, in the mixture of described boron-containing compound and cation high molecular, the quality of described boron-containing compound accounts for 0.1% to 15% of described cation high molecular quality.
In the present embodiment, under the condition of 20 ° of C to 110 ° of C, described boron-containing compound joins with the formation of solid and in the aqueous solution of described cation high molecular, prepares described paper making additive.
It should be noted that, carry out the temperature in mixed process at described boron-containing compound and cation high molecular, agitating modes etc. can be set according to actual needs, and described boron-containing compound and cation high molecular are before mutually mixing to prepare described paper making additive, described boron-containing compound and cation high molecular form does not separately have special restriction, both can solid-liquid, Gu Gu the mode of liquid-liquid mixes to prepare described paper making additive, certainly, in the process of the described paper making additive of preparation, can also comprise solvent and other functional papermaking medicament to interpolation in described paper making additive.
Described paper making additive is joined in the slurry that contains mechanical pulp so that slurry is carried out to pretreated step;
Understandable, in described slurry, the content of described mechanical pulp does not have special restriction, and it can limit according to the actual requirements.Preferably, in the present embodiment, mechanical pulp shared specific gravity range in described slurry is 10% ~ 90%.
In the present invention, utilize described paper making additive to carry out pretreated mode to the slurry that contains mechanical pulp and comprise two kinds of modes: the first is that paper making additive is directly joined in the slurry that contains mechanical pulp so that slurry is carried out to preliminary treatment; The second is first to utilize paper making additive to mix that with mechanical pulp mechanical pulp is carried out to preliminary treatment, will mix with the paper pulp of other kind through pretreated mechanical pulp more afterwards.
In this step, the addition of described paper making additive can design according to the actual requirements, preferred, 0.1% to 15% of the total oven dry stock of slurry that the addition of described paper making additive contains mechanical pulp described in being.
In the pretreated slurry of described process, add filler mixes slurry step with preparation;
In this step, the addition of described filler can add equally according to the actual requirements, preferred, 10% to 300% of the total oven dry stock of slurry that the addition of described filler contains mechanical pulp described in being.
Utilize described mixing to starch the step of the paper of manufacturing paper with pulp.
Understandable, utilizing described mixing slurry to manufacture paper with pulp before paper, also comprise to the step of adding starch and retention agent in described mixing slurry.
It should be noted that in the present invention, all there is no special restriction for kind, addition, the addition manner of starch and retention agent, it all can be set according to actual needs.
Preferably, the described retention agent Microparticle Retention System of one or more cationic polyelectrolytes and one or more anionic species composition of serving as reasons.
Above-mentioned paper technology provided by the present invention, it mixes boron-containing compound the paper making additive being cross-linked to form with cation high molecular, and utilize described paper making additive to carry out preliminary treatment to the slurry that contains mechanical pulp, afterwards to preparing and manufacture paper with pulp with mixing slurry through adding filler in pretreated slurry.By the way, can improve significantly fiber fines in slurry and the retention of filler, its reason is: the boron-containing compounds such as borate are as conventional crosslinking agent, after mixing with cation high molecular, it can form boron-containing compound-cation high molecular cross-linked network with cation high molecular generation cross-linking reaction, by mixed with cation high molecular by boron-containing compound the paper making additive being cross-linked to form join the paper pulp fiber that contains mechanical pulp in after, on the one hand, first boron-containing compound-cation high molecular cross-linked network that relative size is larger can mutually combine with electronegative paper pulp fiber and form CATION point at fiber surface, same, for the fiber fines in mechanical pulp, its meeting is too attracted and mutually combines with boron-containing compound-cation high molecular cross-linked network by boron-containing compound-cation high molecular cross-linked network, like this, by the effect of boron-containing compound-cation high molecular cross-linked network, fiber fines in mechanical pulp will be firm rest in slurry, and be not easy to run off under the drive of mthod of white water from paper making, on the other hand, owing to joining the boron-containing compound-cation high molecular cross-linked network in the slurry that contains mechanical pulp and electronegative paper pulp fiber mutually combines and form CATION point at fiber surface, therefore, join after in pretreated slurry at filler, forming CATION point at fiber surface can effectively adsorb filler, thereby improve the adhesion between filler and fiber, simultaneously, slurry all can increase the uniformity that slurry mixes by stirring in process for preparation, because the diameter of filler grain is relatively little, therefore under the effect of stirring, part filler grain can directly enter into the layer structure inside of paper pulp fiber, and slurry is carried out to pretreated paper making additive, because the size of its contained boron-containing compound-cation high molecular cross-linked network is relatively large, therefore boron-containing compound-cation high molecular cross-linked network is not easy to enter into the layer structure inside of fiber, and be the layer structure outside that absorption is wrapped in fiber, like this, after stirring stops, within boron-containing compound-cation high molecular cross-linked network that the filler grain that enters into the layer structure inside of fiber under stirring action will be adsorbed the layer structure outside that is wrapped in fiber is locked in the layer structure of fiber and be not easy out.Therefore, based on above-mentioned principle, the paper making additive that the present invention utilizes boron-containing compound to mix with cation high molecular and is cross-linked to form carries out after preliminary treatment the slurry that contains mechanical pulp, can promote significantly fiber fines in slurry and the retention of filler.
Below, be five groups of contrast experiments that the above-mentioned paper technology that provides according to embodiment of the present invention carries out.It should be noted that in the following embodiments, do not have special restriction for the process conditions such as diluted slurry, stirring, it all can change according to different process requirements, and it can not cause restriction to described paper technology provided by the present invention.
First group: the experiment that the paper technology providing according to prior art and this case respectively in the situation that of not adding retention agent in papermaking systems carries out, wherein comparative example 1 is prior art, embodiment 1 is the present invention, and it adopts directly to the mode of adding paper making additive in the slurry that contains mechanical pulp described slurry is carried out to preliminary treatment.
Comparative example 1: get bleaching needle-point leaf pulp 10%, poplar hydrogen peroxide chemi-mechanical pulp 90%, the aqueous slurry of 20g oven dry stock altogether, adding quality is the filler of over dry stock quality 50%, continues to add 2% starch, dilution, handsheet, quantitatively 70gsm.
Embodiment 1: get bleaching needle-point leaf pulp 10%, poplar hydrogen peroxide chemi-mechanical pulp 90%, amount to the aqueous slurry of 20g oven dry stock, be that the described paper making additive of paper pulp oven dry stock quality 1.5% carries out preliminary treatment to slurry to adding quality in slurry, afterwards, adding equally quality is the filler of over dry stock quality 50%, continue to add 2% starch, dilution, handsheet, quantitatively 70gsm.
Second group: the experiment that the paper technology providing according to prior art and this case respectively in the situation that of adding retention agent in papermaking systems carries out, wherein comparative example 2 is prior art, embodiment 2 is the present invention, and it is same adopts directly to the mode of adding paper making additive in the slurry that contains mechanical pulp described slurry is carried out to preliminary treatment.
Comparative example 2: get bleaching needle-point leaf pulp 20%, bleached hardwood pulp material 70%, poplar hydrogen peroxide chemi-mechanical pulp 10%, amount to the aqueous slurry of 20g over dry, be adjusted to slurry and be densely about 4%, under 600RPM, stir 5 minutes, continuing under stirring condition, to add quality is the moisture heavy calcium carbonate filling of slurry oven dry stock 300%, continuing to add quality is the starch of slurry oven dry stock 2%, be diluted with water to slurry dense 1%, add successively ternary to retain the each 300PPM of auxiliary agent, 3600PPM, 800PPM, the composition that ternary retains auxiliary agent is: cationic polyacrylamide, bentonite, anionic polyacrylamide, under 600RPM, stir 5 minutes, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 100gsm.
Embodiment 2: get bleaching needle-point leaf pulp 20%, bleached hardwood pulp material 70%, poplar hydrogen peroxide chemi-mechanical pulp 10%, amount to the aqueous slurry of 20g over dry, be adjusted to slurry and be densely about 4%, under 600RPM, stir 5 minutes, the paper making additive of getting quality and be slurry oven dry stock 1.5% joins in described slurry slurry is carried out to preliminary treatment, afterwards, under stirring condition, adding quality is the moisture heavy calcium carbonate filling of slurry oven dry stock 300%, continuing to add quality is the cationic starch of slurry oven dry stock 2%, be diluted with water to slurry dense 1%, add successively ternary to retain the each 300PPM of auxiliary agent, 3600PPM, 800PPM, the composition that ternary retains auxiliary agent is: cationic polyacrylamide, bentonite, anionic polyacrylamide, under 600RPM, stir 5 minutes, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 100gsm.
The 3rd group: the experiment that the paper technology providing according to prior art and this case respectively in the situation that of adding retention agent in papermaking systems carries out, wherein comparative example 3 is prior art, embodiment 3 is the present invention, and it is same adopts directly to the mode of adding paper making additive in the slurry that contains mechanical pulp described slurry is carried out to preliminary treatment.
Comparative example 3: compared with comparative example 2, only amount of filler is 200% of fiber oven-dry weight, and all the other conditions are identical.
Embodiment 3: get bleaching needle-point leaf pulp 20%, bleached hardwood pulp material 70%, poplar hydrogen peroxide chemi-mechanical pulp 10%, amount to the aqueous slurry of 20g over dry, be adjusted to slurry and be densely about 4%, under 600RPM, stir 5 minutes, the paper making additive of getting quality and be slurry oven dry stock 15% joins in described slurry slurry is carried out to preliminary treatment, afterwards, under stirring condition, adding quality is the moisture heavy calcium carbonate filling of slurry oven dry stock 200%, continuing to add quality is the cationic starch of slurry oven dry stock 2%, be diluted with water to slurry dense 1%, add successively ternary to retain the each 300PPM of auxiliary agent, 3600PPM, 800PPM, the composition that ternary retains auxiliary agent is: cationic polyacrylamide, bentonite, anionic polyacrylamide, under 600RPM, stir 5 minutes, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 100gsm.
The 4th group: the experiment that the paper technology providing according to prior art and this case respectively in the situation that of not adding retention agent in papermaking systems carries out, wherein, comparative example 4 is prior art, embodiment 4, 5 is the present invention, it is different that embodiment 4 and the difference of embodiment 5 are that slurry is carried out to pretreated mode, wherein embodiment 4 adopts directly to the mode of adding paper making additive in the slurry that contains mechanical pulp described slurry is carried out to preliminary treatment, embodiment 5 adopts first to utilize paper making additive to mix to obtain preliminary treatment machinery slurry with mechanical pulp, afterwards preliminary treatment machinery slurry is starched to the mode of mixing with on-mechanical the slurry that contains mechanical pulp is carried out to preliminary treatment.
Comparative example 4: get bleaching needle-point leaf pulp 10%, poplar hydrogen peroxide chemi-mechanical pulp APMP90%, amount to the aqueous slurry of 20g oven dry stock, be adjusted to slurry and dense being about under 4%, 600RPM stir 5 minutes, under stirring condition, adding quality is the moisture heavy calcium carbonate filling of oven dry stock quality 10%, continue to add the cationic starch of over dry slurry 0.1%, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 80gsm.
Embodiment 4: compared with comparative example (4), only, adding before filler, add the paper making additive with respect to fiber over dry slurry 0.1%, all the other conditions are identical.
Embodiment 5: get the poplar hydrogen peroxide chemi-mechanical pulp (APMP slurry) of relative 20g containing oven dry stock 90%, adding quality is the paper making additive of 20g oven dry stock 0.1%; Continue to add the filler with respect to 20g bone dry fiber consumption 10%; Mix, obtain a kind of preliminary treatment APMP slurry; Continue to get the bleaching needle-point leaf pulp material of the 20g identical with comparative example (4) containing oven dry stock 10%, mix with preliminary treatment APMP slurry obtained above; Continue to add the cationic starch of over dry slurry 0.1%, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 80gsm.
The 5th group: the experiment that the paper technology providing according to prior art and this case respectively in the situation that of adding retention agent in papermaking systems carries out, wherein, comparative example 5 is prior art, embodiment 6 is the present invention, embodiment 6 adopts first to utilize paper making additive to mix to obtain preliminary treatment machinery slurry with mechanical pulp, afterwards preliminary treatment machinery slurry is starched to the mode of mixing with on-mechanical the slurry that contains mechanical pulp is carried out to preliminary treatment.
Comparative example 5: get bleaching needle-point leaf pulp 10%, poplar hydrogen peroxide chemi-mechanical pulp 90%, amount to the aqueous slurry of 20g oven dry stock, be adjusted to slurry and be densely about 4%, under 600RPM, stir 5 minutes, under stirring condition, adding quality is the moisture heavy calcium carbonate filling of oven dry stock quality 300%, continue to add the cationic starch of over dry slurry 2%, be diluted with water to slurry dense 1%, add successively ternary to retain the each 300PPM of auxiliary agent, 3600PPM, 800PPM, the composition that ternary retains auxiliary agent is: cationic polyacrylamide, bentonite, anionic polyacrylamide, under 600RPM, stir 5 minutes, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 65gsm.
Embodiment 6: get the poplar hydrogen peroxide chemi-mechanical pulp (APMP slurry) of relative 20g containing oven dry stock 90%, add the paper making additive that is equivalent to 20g oven dry stock 1.5%; Continue to add the filler that is equivalent to 20g oven dry stock consumption 300%; Mix, obtain a kind of preliminary treatment APMP slurry; Continue to get the bleaching needle-point leaf pulp material of the 20g identical with comparative example (5) containing oven dry stock 10%, mix with preliminary treatment APMP slurry obtained above; Continue to add the cationic starch of over dry slurry 2%, be diluted with water to slurry dense 1%, add successively ternary to retain the each 300PPM of auxiliary agent, 3600PPM, 800PPM, the composition that ternary retains auxiliary agent is: cationic polyacrylamide, bentonite, anionic polyacrylamide, under 600RPM, stir 5 minutes, be diluted to slurry concentration approximately 0.3%, join the handsheet of folding arms, quantitatively 65gsm.
Following table is the result after respectively the performance of the paper that in above-mentioned five groups of experiments, each paper technology manufactures paper with pulp out being tested, wherein, initial journey ash content retention rate=A*100/ (L* (1-A)), ash content retention rate=A/L, wherein, A is the ash content of paper, L by paper pulp the quality of interpolation filler.
Can be found out by first group of experimental data, the in the situation that of not adding retention agent in papermaking systems, the filler retention of the paper of manufacturing paper with pulp out according to paper technology provided by the present invention has obtained effective lifting.Can be found out by second group to the 5th group experimental data, in described paper technology provided by the present invention, no matter to adopt directly to being mixed with the mode of adding paper making additive in the slurry of mechanical pulp described slurry to carry out preliminary treatment, or adopt and first utilize paper making additive to mix to obtain preliminary treatment machinery slurry with mechanical pulp, again preliminary treatment machinery slurry is starched to the mode of mixing with on-mechanical afterwards described slurry is carried out to preliminary treatment, the filler retention of the paper of manufacturing paper with pulp out through above-mentioned two kinds of pretreated slurries of mode all has obvious lifting than the filler retention of the paper of manufacturing paper with pulp out according to prior art.
In addition, those skilled in the art also can do other variation in spirit of the present invention.Therefore the variation that these do according to spirit of the present invention, within all should being included in the present invention's scope required for protection.
Claims (15)
1. a paper technology, it comprises the steps:
Boron-containing compound is mixed crosslinked with preparation paper making additive with cation high molecular;
Utilize described paper making additive to carry out preliminary treatment to the slurry that contains mechanical pulp;
In the slurry through after above-mentioned preliminary treatment, add filler and mix slurry with preparation;
And
Utilize described mixing to starch the paper of manufacturing paper with pulp.
2. paper technology as claimed in claim 1, is characterized in that: described boron-containing compound is one or more in boric acid, Boratex, Firebrake ZB, borax, raphite, boromagnesite, ludwigite and boracite.
3. paper technology as claimed in claim 1, is characterized in that: described cation high molecular is one or more in block, grafting and the derivative of cationic polysaccharide, amido high polymer, cationic polysaccharide and amido high polymer.
4. paper technology as claimed in claim 3, it is characterized in that: described cationic polysaccharide comprises cationic cellulose and quaternary ammonium salt derivative, cation guar gum and quaternary ammonium salt derivative thereof, cationic starch, CATION sodium alginate and quaternary ammonium salt derivative, shitosan and quaternary ammonium salt derivative thereof, and described amido high polymer comprises cationic polyacrylamide, polyvinylamine, polymine.
5. paper technology as claimed in claim 1, is characterized in that: the molecular weight of described cation high molecular is 2,000 ~ 2,000,000.
6. paper technology as claimed in claim 1, is characterized in that: the molecular weight of described cation high molecular is 20,000 ~ 1,000,000.
7. the paper technology as described in claim 1 ~ 6 any one, is characterized in that: in described paper making additive, the quality of described boron-containing compound accounts for 0.1% ~ 15% of described cation high molecular quality.
8. paper technology as claimed in claim 7, is characterized in that: the addition of described paper making additive is 0.1% to 15% of described slurry oven dry stock.
9. paper technology as claimed in claim 1, is characterized in that: utilizing described mixing slurry to manufacture paper with pulp before paper, also comprising to the step of adding starch and retention agent in described mixing slurry.
10. paper technology as claimed in claim 9, is characterized in that: the serve as reasons Microparticle Retention System of one or more cationic polyelectrolytes and one or more anionic species composition of described retention agent.
11. paper technologies as claimed in claim 10, is characterized in that: described retention agent is the ternary Microparticle Retention System being formed by cationic polyacrylamide, bentonite and anionic polyacrylamide.
12. paper technologies as claimed in claim 1, is characterized in that: in described mixing slurry, the addition of described filler is 10% to 300% of described slurry oven dry stock.
13. paper technologies as claimed in claim 1, is characterized in that: in described slurry, the ratio of described mechanical pulp is 10% ~ 90%.
14. paper technologies as claimed in claim 1, is characterized in that: the described slurry that contains mechanical pulp is carried out to preliminary treatment by described paper making additive is directly joined in described slurry and realized.
15. paper technologies as claimed in claim 1, it is characterized in that: utilize described paper making additive to carry out preliminary treatment to the described slurry that contains mechanical pulp and realize in the following way, first utilize paper making additive to mix to obtain preliminary treatment machinery slurry with mechanical pulp, then described preliminary treatment machinery slurry and on-mechanical are starched and mixed to obtain the slurry that contains mechanical pulp through pretreated.
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| CN201310048007.6A CN103966886A (en) | 2013-02-05 | 2013-02-05 | Papermaking technology |
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| CN201310048007.6A CN103966886A (en) | 2013-02-05 | 2013-02-05 | Papermaking technology |
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| CN1275116A (en) * | 1997-09-30 | 2000-11-29 | 纳尔科化学公司 | Colloidal borosilicates and their use in poduction of paper |
| CN1705797A (en) * | 2002-09-17 | 2005-12-07 | 国际纸业公司 | Papers comprising a boron-containing compound and a method of making same |
| CN101815728A (en) * | 2007-08-02 | 2010-08-25 | 赫尔克里士公司 | Modified vinylamine-containing polymers as additives in papermaking |
| CN101974125A (en) * | 2004-07-30 | 2011-02-16 | 巴斯夫欧洲公司 | Polymeric boronic acid derivatives and their use for papermaking |
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- 2013-02-05 CN CN201310048007.6A patent/CN103966886A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756801A (en) * | 1984-01-11 | 1988-07-12 | Kemira Oy | Paper-making method and a combination of ingredients to be used in it |
| CN1262715A (en) * | 1997-06-04 | 2000-08-09 | 罗狄亚化学公司 | Method for making paper using gelling system |
| CN1275116A (en) * | 1997-09-30 | 2000-11-29 | 纳尔科化学公司 | Colloidal borosilicates and their use in poduction of paper |
| CN1705797A (en) * | 2002-09-17 | 2005-12-07 | 国际纸业公司 | Papers comprising a boron-containing compound and a method of making same |
| CN101974125A (en) * | 2004-07-30 | 2011-02-16 | 巴斯夫欧洲公司 | Polymeric boronic acid derivatives and their use for papermaking |
| CN101815728A (en) * | 2007-08-02 | 2010-08-25 | 赫尔克里士公司 | Modified vinylamine-containing polymers as additives in papermaking |
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Application publication date: 20140806 |