CN103590282B - Coating and apply the coated paper of this coating - Google Patents
Coating and apply the coated paper of this coating Download PDFInfo
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- CN103590282B CN103590282B CN201210288467.1A CN201210288467A CN103590282B CN 103590282 B CN103590282 B CN 103590282B CN 201210288467 A CN201210288467 A CN 201210288467A CN 103590282 B CN103590282 B CN 103590282B
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Abstract
The invention provides the coating that a kind of field of papermaking uses, it contains nano micro crystal cellulose, pigment, latex, auxiliary addition agent and water, this nano micro crystal cellulose to be hydrolyzed in strong acid by cellulose family raw material and the length obtained is 100-500nm, and width is the cellulose of the highly crystalline of 3-100nm; In this coating, the absolute dry mass number of each material is: nano micro crystal cellulose is 0.02-10 part, and pigment is 75-95 part, and latex is 5-15 part, and auxiliary addition agent is 0.35-10 part.The present invention also provides a kind of and applies the obtained coated paper of above-mentioned coating.Coatings of the present invention, in paper surface, effectively can promote the glossiness of coated paper, the rear glossiness of print and roughness, be improved from the quality forming paper.
Description
Technical field
The present invention relates to the coating of a kind of field of papermaking use and apply the obtained coated paper of this coating.
Background technology
In field of papermaking, in order to give paper some special performance, usually in one side or the two sided coatings coating also dry formation coating of body paper.But there is following problem in existing coatings: the bad printing caused of roughness of (1) coated paper is bad; (2) coated paper glossiness and the rear glossiness of print are subject to the impact of pigment in formulation for coating material, and excellent glossiness often needs to rely on additionally adds china clay, winnofil or nano silicon, thus papermaking cost is increased.
Summary of the invention
In view of this, be necessary to provide a kind of coating effectively solved the problem.
In addition, there is a need to provide a kind of and apply the obtained coated paper of above-mentioned coating.
A kind of coating, it contains pigment, latex, auxiliary addition agent and water, this coating is also containing nano micro crystal cellulose, and this nano micro crystal cellulose to be hydrolyzed in strong acid by cellulose family raw material and the length that obtains is 100-500nm, and width is the cellulose of the highly crystalline of 3-100nm; In this coating, the absolute dry mass number of each material is: nano micro crystal cellulose is 0.02-10 part, and pigment is 75-95 part, and latex is 5-15 part, and auxiliary addition agent is 0.35-10 part.
A kind of coated paper applied above-mentioned coating coating and obtain, this coated paper comprises body paper and is formed at the coating layer on body paper surface, this coating layer is single or multiple lift, containing nano micro crystal cellulose in this coating layer, this nano micro crystal cellulose to be hydrolyzed in strong acid by cellulose family raw material and the length obtained is 100-500nm, and width is the cellulose of the highly crystalline of 3-100nm.
Coatings containing nano micro crystal cellulose of the present invention is in paper surface, effectively can promote the glossiness of coated paper, the rear gloss of print and roughness, thus be reduced in the bad roughness of paper and cause and print bad risk, also reduce the needs additionally adding china clay, winnofil or nano silicon simultaneously; In addition the described coatings containing nano micro crystal cellulose can also make coated paper surface more level and smooth in paper surface, can meet the food of medium-to-high grade printing demand and top grade and the requirement of cosmetic package paper.
Detailed description of the invention
The straight-chain polysaccharide that cellulose is made up of through β-Isosorbide-5-Nitrae glycosidic bond D-glucopyranose ring.Nano micro crystal cellulose (NanoCrystallineCellulose, NCC) of the present invention, be to be hydrolyzed in strong acid by cellulose family raw material and the length obtained is 100-500nm, width is the cellulose of the highly crystalline of 3-100nm.In the industry cycle, NCC also can be called Cellulose nanocrystal palpus, Cellulose nanocrystal body, cellulose nanometer rods, rod type cellulose crystallite body or cellulose nano wire.
The nano micro crystal cellulose fiber that the present invention uses is prepared by the method for strong acid hydrolysis string, but be not limited to the method preparation.In preparation process, the unformed glucose unit in string is hydrolyzed, and leaves the cellulose unit that degree of crystallinity is higher; Its size is less, and the degree of order is high, specific area is very large, can stable dispersion in coating, there is good compatibility in water paint; And the flocculation of coating particles can not be caused; Simultaneously due to the filming performance that nano micro crystal cellulose is good, under other equal conditions, some qualities of paper are become to obtain useful lifting.
Nano micro crystal cellulose of the present invention uses the method preparation of strong acid hydrolysis, and the method comprises the steps:
(1) get BKP slurry (chemical bleaching is starched, not containing lignin) and carry out making beating process, until its freedom is less than 200ml.
(2) getting absolute dry mass is slurry after the making beating of 6g, adds in the concentrated sulfuric acid (mass percentage concentration is 60%) of 60-120ml, under the temperature conditions of 40-70 ° of C, reacts 10-120 minute.
(3) add the water of 600-1200ml, after thing to be precipitated is separated out, washing precipitate is to pH weakly acidic pH.
(4) sediment got after washing adds deionized water, is configured to the suspension that mass percentage is 0.5%-1.0%.
(5) frequency of utilization is 20kHz, suspension 35 minutes described in the ultrasonic wave process that power is 21W, obtains a kind of colloidal suspensions of translucent or all-transparent shape, is the aqueous dispersions of NCC.
The method of strong acid hydrolysis is prepared nano micro crystal cellulose and is not limited to use sulfuric acid, also can use the alternative sulfuric acid such as phosphoric acid, hydrochloric acid, mixed acid, hydrobromic acid.But various different types of acid, reaction condition is difference to some extent.
Apply a coating of above-mentioned NCC, this coating contains NCC, pigment, latex and auxiliary addition agent, and wherein in this coating, the absolute dry mass number of each material is: NCC is 0.02-10 part, and pigment is 75-95 part, and latex is 5-15 part, and auxiliary addition agent is 0.35-10 part.The solid content of this coating is 25%-75%.This coating also can add the pH value of alkali for adjusting coating, and the addition of described alkali makes the pH of coating be 8-10.5.Understandable, according to actual conditions needs, in this coating, also can not alkali be added.
Described pigment be selected from grinding calcium carbonate (GCC), winnofil (PCC), kaolin, talcum powder one or more.Described pigment preferably 65% pigment particle size be less than 2 μm; More preferably the pigment particle size of 95% is less than 2 μm.
Described latex can be the latex of conventional coating for paper such as styrene-butadiene latex, propyl benzene latex, methyl methacrylate styrene-butadiene latex, styrene acrylic resin and acrylic emulsion, polyaminoester emulsion etc.
Described auxiliary addition agent is the auxiliary additive of conventional coating for paper, specifically optionally adds coating starch, resistance to hydrated agent, lubricant, defoamer, dispersant, rheology modifying agent, one or more in fluorescent whitening agent and dyestuff.Be total up to 0.35-10 parts by mass with auxiliary additive, wherein the mass fraction of each component is coating starch 0-7 part, the 0.15-1 of resistance to hydrated agent part, lubricant 0.25-1 part, defoamer 0.05-0.5 part, dispersant 0.05-0.5 part, rheology modifying agent 0-1 part, fluorescent whitening agent 0-3 part, dyestuff 0-1.5 part.In addition, the concrete composition of these auxiliary addition agents is the usual composition of coating for paper.
Described alkali is preferably NaOH or potassium hydroxide, but is not limited to this two kinds of alkali.
The preparation method of above-mentioned coating, by the alkali of the latex of the auxiliary addition agent of the pigment of 75-95 weight portion, 0.35-10 weight portion, 5-15 weight portion, NCC, 0.1-1 weight portion of 0.02-10 weight portion and appropriate water, mix, namely obtain a kind of papermaking coating containing nano micro crystal cellulose.The preparation of described coating also can add above-mentioned raw materials by a graded.The solid content of this coating is 25%-75%, and pH value is 8-10.5.
The preparation of above-mentioned coating can be carried out in mixing tank for coating colors, disperses with the speed of more than 2000rpm.
NCC makes an addition in coating by the present invention, has a lot of beneficial effect:
A the NCC of () less consumption can change viscosity, the shear viscosity of coating, can be used as the rheology modifying agent of coating, coalescents.
B () NCC is a kind of poly-polysaccharose substance of complexity, a large amount of hydroxyl that its molecule has can be used to play effect that is crosslinked, auxiliary binder, thus strengthens the performance of coating.
When () consumption is more c, the alternative a part of synthetic latex of NCC, has certain economic worth and the value of environmental protection;
D () NCC is a kind of fiber, be negative in its surface, can adsorb the particle of some positives in coating, is conducive to the dispersion of pigment.
Apply the coated paper that described coatings is obtained, it comprises body paper and is formed at the coating layer on body paper surface, and this coating layer can be single or multiple lift.
Coatings containing NCC of the present invention is in paper surface, effectively can promote the glossiness of coated paper, the rear glossiness of print and roughness, thus be reduced in the bad roughness of paper and cause and print bad risk, also reduce the needs additionally adding china clay, winnofil or nano silicon simultaneously; In addition the described coatings containing NCC can also make coated paper surface more level and smooth in paper surface, can meet the food of medium-to-high grade printing demand and top grade and the requirement of cosmetic package paper.
Below by specific embodiment, the present invention is described further.
Embodiment 1
The present embodiment adds 0.1 part of NCC at precoated shet, and finishing coat adds 0.02 part of NCC.
Preparation precoating coating: get 75 parts of GCC, adding NaOH adjusting coating pH is 9.5, adds 7.5 parts of latex, 0.1 part of NCC; Continue interpolation 7.6 parts of auxiliary addition agents, this auxiliary addition agent comprises 7 parts of coating starch, 0.05 part of dispersant, 0.05 part of lubricant, 0.1 part of defoamer and 0.4 part of resistance to hydrated agent, and the adjusting coating solid content that adds water is 64%; High speed dispersion is obtained precoating coating after 20 minutes.
Prepare painting coating: get 90 parts of pigment, comprise 85 parts of GCC and 5 part kaolin; PH is adjusted to about 9 by adding NaOH; Add 10 parts of latex, 0.02 part of NCC; Continue interpolation 2.25 parts of auxiliary addition agents, this auxiliary addition agent comprises 0.2 part of dispersant, 1 part of lubricant, 0.05 part of defoamer and 1 part of resistance to hydrated agent; Adjusting coating solid content is 75%, and high speed dispersion is obtained painting coating after 20 minutes.
Coated paper is prepared in coating: get a kind of uncoated paper, its grammes per square metre is 69g/m
2; Get precoating coating and carry out coated paper pre-coating, coating weight is 13g/m
2; And then get above-mentioned painting coating, carry out once face on precoated shet surface and be coated with, coating weight is 12g/m
2; Finally one-tenth paper is carried out press polish ornamenting, obtained coated paper.
Comparative example 1
Prepare precoating coating, painting coating coated paper is prepared in coating with reference to the method step of embodiment 1, technological parameter, but this precoating coating and painting coating all do not add NCC.
Embodiment 1 and the coating obtained by comparative example 1 and coated paper carry out performance test, and the performance test results as shown in Table 1.
Table one
| Test event | Comparative example 1 | Embodiment 1 |
| Precoating coating static viscosity cps | 1082 | 1334 |
| Painting coating static viscosity cps | 1782 | 2134 |
| Precoating coating shear viscosity cps | 22.4 | 23.5 |
| Painting coating shear viscosity cps | 34.4 | 37.2 |
| Basic weight g/m 2 | 93.2 | 93.3 |
| Thickness μm | 85.2 | 85.0 |
| Roughness μm | 1.02 | 0.94 |
| Smoothness s | 585 | 701 |
| Air permeability s | 4470 | 5585 |
| Glossiness % | 68.3 | 72.3 |
| Glossiness % after print | 89.9 | 92.7 |
As shown in Table 1: compared to the coated paper that common coatings is obtained, the glossiness and the rear glossiness of print that are added with the coated paper that NCC coatings obtains all have remarkable lifting; Paper smoothness index also has obvious lifting, and paper surface is smoother, roughness is less than 1 μm.
Embodiment 2
The present embodiment adds 0.15 part of NCC at finishing coat.
Preparation precoating coating: get 75 parts of GCC, adding NaOH adjusting coating pH is 9.5, adds 7.5 parts of latex; Continue interpolation 7.6 parts of auxiliary addition agents, this auxiliary addition agent comprises 7 parts of coating starch, 0.05 part of dispersant, 0.05 part of lubricant, 0.1 part of defoamer and 0.4 part of resistance to hydrated agent, and the adjusting coating solid content that adds water is 64%; High speed dispersion is obtained precoating coating after 20 minutes.
Prepare painting coating: get 90 parts of pigment, comprise 36 parts of GCC and 54 part kaolin; PH is adjusted to about 9.5 by adding NaOH; Add 11 parts of synthetic latexes, add 0.15 part of NCC; Continue to add auxiliary addition agent, this auxiliary addition agent comprises 0.05 part of dispersant, 0.6 part of lubricant, 0.05 part of defoamer and 0.6 part of resistance to hydrated agent; Adjusting coating solid content is 67%, and high speed dispersion is obtained painting coating after 20 minutes.
Coated paper is prepared in coating: get a kind of uncoated paper, its grammes per square metre is 82g/m
2; Get precoating coating and carry out coated paper pre-coating, coating weight is 13g/m
2; And then get above-mentioned painting coating, carry out once face on precoated shet surface and be coated with, coating weight is 12g/m
2; Finally one-tenth paper is carried out press polish ornamenting, obtained coated paper.
Comparative example 2
Prepare precoating coating, painting coating coated paper is prepared in coating with reference to the method step of embodiment 2, technological parameter, but this precoating coating and painting coating all do not add NCC.
Embodiment 2 and the coating obtained by comparative example 2 and coated paper carry out performance test, and the performance test results as shown in Table 2.
Table two
| Test event | Comparative example 2 | Embodiment 2 |
| Precoating coating static viscosity cps | 1082 | 1082 |
| Painting coating static viscosity cps | 1349 | 1403 |
| Precoating coating shear viscosity cps | 22.4 | 22.4 |
| Painting coating shear viscosity cps | 24.5 | 24.7 |
| Basic weight g/m 2 | 107.7 | 108.2 |
| Thickness μm | 102.7 | 103.1 |
| Roughness μm | 1.85 | 1.71 |
| Smoothness s | 637 | 668 |
| Air permeability s | 3219 | 3788 |
| Glossiness % | 68.8 | 71.4 |
| Glossiness % after print | 82.9 | 84.8 |
As shown in Table 2: compared to the coated paper that common coatings is obtained, the glossiness and the rear glossiness of print that are added with the coated paper that NCC coatings obtains all have remarkable lifting, and paper surface roughness reduces, and smoothness raises.
Embodiment 3
The present embodiment adds 10 parts of NCC in coating.
Prepare coating: get 95 parts of GCC, add NaOH adjusting coating about pH to 9, add 5 parts of synthetic latexes, 10 parts of NCC; Continue to add auxiliary addition agent, this auxiliary addition agent comprises 0.05 part of dispersant, 0.6 part of lubricant, 0.05 part of defoamer and 0.3 part of resistance to hydrated agent, and the adjusting coating solid content that adds water is 25%; High speed dispersion is obtained coating after 20 minutes.
Coated paper is prepared in coating: get a kind of uncoated paper, its grammes per square metre is 50g/m
2; Get above-mentioned coating to be once coated with, coating weight is 4g/m
2; Finally one-tenth paper is carried out press polish ornamenting, obtained coated paper.
Comparative example 3
The method step of reference embodiment 3, technological parameter prepare coating and coated paper is prepared in coating, but this coating does not add NCC.
Embodiment 3 and the coating obtained by comparative example 3 and coated paper carry out performance test, and the performance test results as shown in Table 3.
Table three
| Test event | Comparative example 3 | Embodiment 3 |
| Dope viscosity cps | 20.9 | 50.4 |
| Basic weight g/m 2 | 55.0 | 54.7 |
| Thickness μm | 73.1 | 72.7 |
| Air permeability s | 142.7 | 87.9 |
| Smoothness s | 23 | 26 |
| Roughness μm | 6.37 | 5.98 |
| Glossiness % | 25.1 | 27.2 |
| Gloss % after print | 37.9 | 39.1 |
As shown in Table 3: compared to the coated paper that common coatings is obtained, the glossiness and the rear glossiness of print that are added with the coated paper that NCC coatings obtains all have remarkable lifting, and paper surface roughness reduces, and smoothness raises.
In addition, those skilled in the art also can make various amendments in other form and details, interpolation and replacement in the claims in the present invention scope of disclosure and spirit.Certainly, the changes such as these various amendments made according to the present invention's spirit, interpolation and replacement, all should be included within the present invention's scope required for protection.
Claims (11)
1. a coating, it contains pigment, latex, auxiliary addition agent and water, it is characterized in that: this coating is also containing nano micro crystal cellulose, this nano micro crystal cellulose to be hydrolyzed in strong acid by cellulose family raw material and the length obtained is 100-500nm, and width is the cellulose of the highly crystalline of 3-100nm; In this coating, the absolute dry mass number of each material is: nano micro crystal cellulose is 0.02-10 part, and pigment is 75-95 part, and latex is 5-15 part, and auxiliary addition agent is 0.35-10 part.
2. coating as claimed in claim 1, is characterized in that: pigment be selected from grinding calcium carbonate, winnofil, kaolin, talcum powder one or more.
3. coating as claimed in claim 1, is characterized in that: in described pigment, the particle diameter of pigment of 65% is less than 2 μm.
4. coating as claimed in claim 1, is characterized in that: in described pigment, the particle diameter of pigment of 95% is less than 2 μm.
5. coating as claimed in claim 1, is characterized in that: described auxiliary addition agent is selected from coating starch, resistance to hydrated agent, lubricant, defoamer, dispersant, rheology modifying agent, one or more in fluorescent whitening agent and dyestuff.
6. coating as claimed in claim 5, it is characterized in that: be total up to 0.35-10 parts by mass with auxiliary additive, wherein the mass fraction of each component is coating starch 0-7 part, the 0.15-1 of resistance to hydrated agent part, lubricant 0.25-1 part, defoamer 0.05-0.5 part, dispersant 0.05-0.5 part, rheology modifying agent 0-1 part, fluorescent whitening agent 0-3 part, dyestuff 0-1.5 part.
7. coating as claimed in claim 1, is characterized in that: the solid content of this coating is 25%-75%.
8. coating as claimed in claim 1, is characterized in that: described latex is mixture or the polyaminoester emulsion of styrene-butadiene latex, propyl benzene latex, methyl methacrylate styrene-butadiene latex, styrene acrylic resin and acrylic emulsion.
9. coating as claimed in claim 1, is characterized in that: also containing alkali in this coating, the addition of described alkali makes the pH of coating be 8-10.5.
10. coating as claimed in claim 1, is characterized in that: described alkali is NaOH or potassium hydroxide.
11. 1 kinds of application rights require the coated paper that in 1-10, described in any one, coatings is obtained, this coated paper comprises body paper and is formed at the coating layer on body paper surface, this coating layer is single or multiple lift, containing nano micro crystal cellulose in this coating layer, this nano micro crystal cellulose to be hydrolyzed in strong acid by cellulose family raw material and the length obtained is 100-500nm, and width is the cellulose of the highly crystalline of 3-100nm.
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| CN111379192B (en) * | 2020-04-02 | 2022-06-03 | 东莞市金田纸业有限公司 | Special coating for paperboard coating and paperboard |
| CN112626914A (en) * | 2020-11-17 | 2021-04-09 | 宁波亚洲浆纸业有限公司 | Nano-cellulose food packaging paper coating, preparation method thereof and food packaging paper |
| CN112495349B (en) | 2020-12-14 | 2021-12-03 | 江南大学 | Cellulose nanocrystal loaded sodium alginate adsorbent and application thereof in enrichment of organic phosphorus in wastewater |
| WO2023097359A1 (en) * | 2021-11-30 | 2023-06-08 | Earthodic Pty Ltd | Biodegradable functional biobased coating |
| CN116446214A (en) * | 2023-03-13 | 2023-07-18 | 河南聚鹏纸业有限公司 | Composite coating with strong paper adhesiveness and preparation and application methods thereof |
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| CN102587193A (en) * | 2012-03-09 | 2012-07-18 | 武汉晨鸣汉阳纸业股份有限公司 | Coating newsprint and making method thereof |
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| CA2784857C (en) * | 2009-12-21 | 2015-08-04 | Fpinnovations | Coatings containing nanocrystalline cellulose, processes for preparation and use thereof |
| SE536744C2 (en) * | 2010-05-12 | 2014-07-08 | Stora Enso Oyj | A process for manufacturing a composition containing fibrillated cellulose and a composition |
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| CN102587193A (en) * | 2012-03-09 | 2012-07-18 | 武汉晨鸣汉阳纸业股份有限公司 | Coating newsprint and making method thereof |
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