CN103397561B - A kind of method improving ash content of paper - Google Patents
A kind of method improving ash content of paper Download PDFInfo
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- CN103397561B CN103397561B CN201310323297.0A CN201310323297A CN103397561B CN 103397561 B CN103397561 B CN 103397561B CN 201310323297 A CN201310323297 A CN 201310323297A CN 103397561 B CN103397561 B CN 103397561B
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Abstract
The invention discloses a kind of method improving ash content of paper, the method be first adopt band positive electricity coagulant in advance with filler abundant hybrid reaction under high velocity agitation, then add negatively charged synthetic latex, continue papermaking filler that namely abundant hybrid reaction obtain modification and namely can be used for paper and add and fill out.Compare unmodified filler content of ashes in 25 ~ 28% add and fill out paper, the modified filler adopting the present invention to obtain is used for paper and adds when filling out, the content of ashes of final paper is more than 30%, and the optical property of paper, strength character and sizability do not produce obvious reduction, realize effective reduction of fiber consumption and production cost.
Description
Technical field
The invention belongs to the method for paper technology, be specifically related to a kind of method improving ash content of paper in papermaking.
Background technology
The growth of consuming along with paper and cardboard and the swift and violent increase of paper industry production capacity, the supply of fibrous raw material has been a bottleneck of restriction industry development.Present Global paper making raw material is still in pressure, and how to substitute paper pulp with mineral filler as much as possible has become paper technology development trend.
Traditional filler and add embankment formula the bond strength in slurry between fiber can be made to decline.Filler increase also can have a negative impact to Process of Applying Glue, and sizing agent is easy to the surface being adsorbed on filler grain, under meeting the condition of actual needs, sizing agent demand is increased at paper performance.When therefore reducing Substance at the same time and improve ash content of paper, how to ensure or to improve the intensity of paper and sizability is a difficult problem that paper-making industry faces at present.
Use traditional filler to add in current papermaking to fill out, improve retention and drainage aid agent consumption and preferred more efficient reinforcing agent improve consumption by preferred retention and drainage system, in actual production, accessible greyness of paper is about 28%.The method improving paper strength conventional adds heavy polymer, exactly as cationic starch or cation synthesising copolymer in intermittent pulp proportioning.Although the polymer of these high molecular can improve bond strength between the fiber in paper, the existence of filler still can cause weakening of fiber interphase interaction.In order to improve the content of ashes in paper further, just must add more heavy polymer in intermittent pulp proportioning, one of them the unfavorable result done like this will cause the evenness of paper to be sharply deteriorated.And modification is carried out to filling surface, reduce or eliminate because filler exists and makes the difficult adverse effect forming bond strength between fiber, for the content of ashes improved further in paper provides better approach.
In patent document 200880017505.1 " a kind of filler slurry through latex process for papermaking ", develop a kind of continuous print filler processing method, in the method latex is added at ambient temperature in conventional papermaking filler slurry, then mix with the water of temperature higher than latex vitrification point used and obtain the filler through latex process.The modified filler adopting the method to obtain is used for paper and adds when filling out, and can improve filler and keep and sizability, and less to intensity effect.
In United States Patent (USP) 7074845B2, the starch that anionic latex and profit risen is combined, and can obtain higher internal bond strength and tensile strength when the filler obtaining modification adds fill out for paper.In that patent, anionic latex and CATION are moistened the starch granules that rises and are interacted, and form crosslinked starch structure, when with filler slurry rapid mixing, filler are carried out pre-wadding and gather, and obtain higher internal bond strength and tensile strength.Improved the content of ashes in paper by poly-mode of wadding a quilt with cotton in advance, although less to intensity adverse effect, larger adverse effect will be produced to the optical property of paper.The filler that wadding gathers may damage the uniformity of paper, may be decreased through simultaneously and add the expection that filler improves optical property.
Summary of the invention
Object of the present invention, be to provide a kind of method improving ash content of paper, the method be first adopt band positive electricity coagulant in advance with filler abundant hybrid reaction under high velocity agitation, then negatively charged synthetic latex is added, continue the papermaking filler that namely abundant hybrid reaction obtains modification, add and fill out in paper-making process, the content of ashes of final paper is more than 30%, and the optical property of paper, strength character and sizability do not produce obvious reduction (to unmodified filler, content of ashes adds 25 ~ 28% fills out paper), realize effective reduction of fiber consumption and production cost.The paper of the content of ashes narrated in the present invention more than 30% refers to not containing the paper of coating.
For realizing the object of the invention, the technical scheme adopted:
(1) filler that papermaking uses is prepared into the suspension that solid content is 5 ~ 60%, under high-speed stirred condition, add the coagulant of band positive electricity and carry out sufficient hybrid reaction, dosage of PAC counts 0.1 ~ 2% with over dry filler.
(2) reduce mixing speed, in above-mentioned filler suspension, add negatively charged synthetic latex under agitation and namely obtain modification papermaking filler after carrying out sufficient hybrid reaction, synthetic latex consumption counts 1 ~ 10% with over dry filler.
(3) be added in pulp material mix completing modified papermaking filler, add cationic starch, AKD sizing agent and cationic polyacrylamide retention agent copy paper with slurry.The addition of modification papermaking filler counts 25 ~ 75% with oven dry stock.
The coagulant of described band positive electricity is the organic coagulants of the cationic polymer containing amino, imino group, is low-molecular-weight cationic polyacrylamide, diallyl dimethyl ammoniumchloride, polyamine.In order to avoid papermaking filler suspension causes the overflocculation of filler grain after adding coagulant, must add under high velocity agitation.
Described anion synthetic latex is selected from styrene-butadiene latex, butadiene latex, butyl latex, polychloroprene latex, ethylene propylene rubber latex, isoprene rubber latex, NBR latex, acrylic latex.
The filler that described papermaking uses is mainly inorganic pigment, is selected from grinding calcium carbonate, winnofil, white mud calcium carbonate, china clay, talcum powder and calcium sulfate.Wherein preferred filler is winnofil and grinding calcium carbonate.
Described through modification papermaking filler, compared with unmodified filler, particle size only has a small increase, but domain size distribution becomes narrower being more conducive to obtains reasonable optical property and retention performance.
Under identical paper making process conditions, adopt the present invention and the ash content of paper to reach 33% strength character obtained and unmodified filler and add that to fill out greyness of paper close for 25% strength character obtained, and can 50% be improved on AKD sizability.
Embodiment
Below in conjunction with embodiment, the invention will be further described, but embodiments of the present invention are not limited thereto.
Embodiment 1
(1) grinding calcium carbonate is prepared into the suspension that solid content is 40%, under high-speed stirred condition, add coagulant diallyl dimethyl ammoniumchloride (commercially available) and carry out sufficient hybrid reaction 10min, dosage of PAC counts 1% with over dry filler.Reduce mixing speed, in above-mentioned filler suspension, add anion styrene-butadiene latex (commercially available) under agitation and namely obtain modified abrasive calcium carbonate after carrying out sufficient hybrid reaction 10min, styrene-butadiene latex consumption counts 2 ~ 8% with over dry filler.Grinding calcium carbonate and modified calcium carbonate size distribution as shown in table 1.
(2) by bleached sulphate softwood pulp (beating degree 40 ~ 45 ° of SR) and BRATSK (beating degree 37 ~ 42 ° of SR) by 30: 70 mass ratio mixing, add successively 0.2%AKD sizing agent and 0.03% cationic polyacrylamide retention agent, 45 ~ 75% filler, mix, being diluted with water to slurry concentration is 0.5%, copy paper is carried out, page quantification 70g/m with standard sheet forming apparatus
2.The optical property of paper, strength character and sizability are as shown in table 2.
Table 1
Table 2
Embodiment 2
(1) grinding calcium carbonate is prepared into the suspension that solid content is 40%, under high-speed stirred condition, add the polyacrylamide (taking from BASF) of low molecular weight height positive electricity and carry out sufficient hybrid reaction 10min, dosage of PAC counts 0.02% with over dry filler.Reduce mixing speed, in above-mentioned filler suspension, add anion styrene-butadiene latex (commercially available) under agitation and namely obtain modified abrasive calcium carbonate after carrying out sufficient hybrid reaction 10min, styrene-butadiene latex consumption counts 2 ~ 8% with over dry filler.Grinding calcium carbonate and modified calcium carbonate size distribution as shown in table 3.
(2) by bleached sulphate softwood pulp (beating degree 40 ~ 45 ° of SR) and BRATSK (beating degree 37 ~ 42 ° of SR) by 30: 70 mass ratio mixing, add successively 0.2%AKD sizing agent and 0.03% cationic polyacrylamide retention agent, 45 ~ 75% filler, mix, being diluted with water to slurry concentration is 0.5%, copy paper is carried out, page quantification 70g/m with standard sheet forming apparatus
2.The optical property of paper, strength character and sizability are as shown in table 4.
Table 3
Table 4
The present invention implements according to above-mentioned detailed description of the invention, all produces a desired effect.
Claims (4)
1. one kind is improved the method for ash content of paper, it is characterized in that: the coagulant first adopting band positive electricity in advance with filler suspension abundant hybrid reaction under high velocity agitation, described filler suspension solid content is 5 ~ 60%, the dosage of PAC of described band positive electricity counts 0.1 ~ 2% with over dry filler, then consumption counts 1 ~ 10% anion synthetic latex with over dry filler is added, continue the papermaking filler that namely abundant hybrid reaction obtains modification, be used for paper and add by completing modified papermaking filler and fill out rear formation satisfactory paper.
2. the method for raising ash content of paper according to claim 1, is characterized in that the coagulant of described band positive electricity is low-molecular-weight cationic polyacrylamide, diallyl dimethyl ammoniumchloride.
3. the method for raising ash content of paper according to claim 1, is characterized in that described anion synthetic latex is selected from styrene-butadiene latex, butadiene latex, butyl latex, polychloroprene latex, ethylene propylene rubber latex, isoprene rubber latex, NBR latex, acrylic latex.
4. the method for raising ash content of paper according to claim 1, is characterized in that the filler that described papermaking uses is mainly inorganic pigment, is selected from grinding calcium carbonate, winnofil, white mud calcium carbonate, china clay, talcum powder and calcium sulfate.
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| CN201310323297.0A CN103397561B (en) | 2013-07-30 | 2013-07-30 | A kind of method improving ash content of paper |
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| CN103397561B true CN103397561B (en) | 2016-03-23 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104213462B (en) * | 2014-08-29 | 2017-01-11 | 华南理工大学 | Application method of white clay in papermaking filling |
| CN104611986B (en) * | 2015-01-29 | 2017-05-03 | 金东纸业（江苏）股份有限公司 | Preparation method and application of amphoteric packing |
| CN108547172B (en) * | 2018-04-19 | 2021-06-25 | 济南欣易特种纸业有限公司 | Low-solubility calcium sulfate for papermaking, and production method and application thereof |
| CN113445358A (en) * | 2020-03-24 | 2021-09-28 | 中国制浆造纸研究院有限公司 | High-ash wear-resistant raw paper and preparation method thereof |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1505641A (en) * | 1974-04-19 | 1978-03-30 | Grace W R & Co | Process of preparing a filler composition for paper |
| CN101680186A (en) * | 2007-06-08 | 2010-03-24 | Fp创新研究中心 | Latex-treated filler slurries for use in papermaking |
| CN101802304A (en) * | 2007-09-12 | 2010-08-11 | 纳尔科公司 | Controllable filler prefloculation using a dual polymer system |
| CN103038419A (en) * | 2010-03-19 | 2013-04-10 | 纳尔科公司 | Method of increasing filler content in papermakinG |
-
2013
- 2013-07-30 CN CN201310323297.0A patent/CN103397561B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1505641A (en) * | 1974-04-19 | 1978-03-30 | Grace W R & Co | Process of preparing a filler composition for paper |
| CN101680186A (en) * | 2007-06-08 | 2010-03-24 | Fp创新研究中心 | Latex-treated filler slurries for use in papermaking |
| CN101802304A (en) * | 2007-09-12 | 2010-08-11 | 纳尔科公司 | Controllable filler prefloculation using a dual polymer system |
| CN103038419A (en) * | 2010-03-19 | 2013-04-10 | 纳尔科公司 | Method of increasing filler content in papermakinG |
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Address after: 100102 Zhongyang mansion, No. 4, Qiyang Road, Wangjing, Chaoyang District, Beijing Patentee after: China pulp and Paper Research Institute Co., Ltd. Address before: 100102 Zhongyang mansion, No. 4, Qiyang Road, Wangjing, Chaoyang District, Beijing Patentee before: China National Pulp & Paper Research Institute |
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