CN113047080A - Colored paper and preparation method thereof - Google Patents
Colored paper and preparation method thereof Download PDFInfo
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- CN113047080A CN113047080A CN202110353624.1A CN202110353624A CN113047080A CN 113047080 A CN113047080 A CN 113047080A CN 202110353624 A CN202110353624 A CN 202110353624A CN 113047080 A CN113047080 A CN 113047080A
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- 238000002360 preparation method Methods 0.000 title claims abstract description 9
- 229920001046 Nanocellulose Polymers 0.000 claims abstract description 31
- 238000003756 stirring Methods 0.000 claims abstract description 25
- 238000010438 heat treatment Methods 0.000 claims abstract description 21
- 239000011268 mixed slurry Substances 0.000 claims abstract description 20
- 238000009210 therapy by ultrasound Methods 0.000 claims abstract description 18
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 238000004519 manufacturing process Methods 0.000 claims description 4
- 229920002678 cellulose Polymers 0.000 abstract description 32
- 239000001913 cellulose Substances 0.000 abstract description 32
- 238000004043 dyeing Methods 0.000 abstract description 17
- 230000000694 effects Effects 0.000 abstract description 6
- 230000014759 maintenance of location Effects 0.000 abstract description 4
- 229920001131 Pulp (paper) Polymers 0.000 description 17
- 238000002156 mixing Methods 0.000 description 12
- 238000005303 weighing Methods 0.000 description 7
- 239000000835 fiber Substances 0.000 description 6
- 238000002791 soaking Methods 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- XOFYZVNMUHMLCC-ZPOLXVRWSA-N prednisone Chemical group O=C1C=C[C@]2(C)[C@H]3C(=O)C[C@](C)([C@@](CC4)(O)C(=O)CO)[C@@H]4[C@@H]3CCC2=C1 XOFYZVNMUHMLCC-ZPOLXVRWSA-N 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000007613 environmental effect Effects 0.000 description 2
- 125000000524 functional group Chemical group 0.000 description 2
- 238000007639 printing Methods 0.000 description 2
- 238000007652 sheet-forming process Methods 0.000 description 2
- 239000002002 slurry Substances 0.000 description 2
- 239000010981 turquoise Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- GCFAQSYBSUQUPL-UHFFFAOYSA-I pentasodium 5-[[4-chloro-6-[3-(2-sulfonatooxyethylsulfonyl)anilino]-1,3,5-triazin-2-yl]amino]-3-[(1,5-disulfonatonaphthalen-2-yl)diazenyl]-4-hydroxynaphthalene-2,7-disulfonate Chemical compound [Na+].[Na+].[Na+].[Na+].[Na+].Oc1c(N=Nc2ccc3c(cccc3c2S([O-])(=O)=O)S([O-])(=O)=O)c(cc2cc(cc(Nc3nc(Cl)nc(Nc4cccc(c4)S(=O)(=O)CCOS([O-])(=O)=O)n3)c12)S([O-])(=O)=O)S([O-])(=O)=O GCFAQSYBSUQUPL-UHFFFAOYSA-I 0.000 description 1
- 230000000704 physical effect Effects 0.000 description 1
- KUIXZSYWBHSYCN-UHFFFAOYSA-L remazol brilliant blue r Chemical compound [Na+].[Na+].C1=C(S([O-])(=O)=O)C(N)=C2C(=O)C3=CC=CC=C3C(=O)C2=C1NC1=CC=CC(S(=O)(=O)CCOS([O-])(=O)=O)=C1 KUIXZSYWBHSYCN-UHFFFAOYSA-L 0.000 description 1
- 238000001179 sorption measurement Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 238000001132 ultrasonic dispersion Methods 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H27/00—Special paper not otherwise provided for, e.g. made by multi-step processes
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/16—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only modified by a particular after-treatment
- D21H11/18—Highly hydrated, swollen or fibrillatable fibres
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21H—PULP COMPOSITIONS; PREPARATION THEREOF NOT COVERED BY SUBCLASSES D21C OR D21D; IMPREGNATING OR COATING OF PAPER; TREATMENT OF FINISHED PAPER NOT COVERED BY CLASS B31 OR SUBCLASS D21G; PAPER NOT OTHERWISE PROVIDED FOR
- D21H21/00—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties
- D21H21/14—Non-fibrous material added to the pulp, characterised by its function, form or properties; Paper-impregnating or coating material, characterised by its function, form or properties characterised by function or properties in or on the paper
- D21H21/28—Colorants ; Pigments or opacifying agents
Abstract
The invention provides a colored paper and a preparation method thereof, wherein the method comprises the following steps of (0.01-0.3): (1-3) defibering the nanocellulose and the pulp in water according to the mass ratio to obtain mixed pulp; adding a dye into the mixed slurry, heating to 20-90 ℃ under the condition of stirring, and then sequentially carrying out ultrasonic treatment and natural standing to obtain the dyed mixed slurry; and making the dyed mixed pulp into paper to obtain colored paper. The method is efficient, simple, safe and environment-friendly, can obviously improve the retention rate and the dispersibility of the dye, obtains an ideal dyeing effect, improves the strength performance of the colored paper by utilizing the nano-cellulose, and obviously improves the strength performance of the prepared colored paper.
Description
Technical Field
The invention relates to the technical field of papermaking, in particular to colored paper and a preparation method thereof.
Background
Dyeing is an indispensable link for manufacturing garment materials in the printing and dyeing industry and preparing colored paper in the paper making industry, and is also a main factor causing high energy consumption and serious pollution in the printing and dyeing process. In order to meet the development requirements of environmental protection and new and old kinetic energy conversion, the dyeing technology of energy conservation and emission reduction is of great importance. The nano-size effect of the nano-cellulose endows the nano-cellulose with strong adsorption and fixation capacity to dye molecules, so that the nano-cellulose is applied to the preparation process of the colored paper, can load the dye, effectively reduce the content of the dye in the wastewater, reduce the loss rate of the dye, has important significance for environmental protection, resource saving and the like, and can obviously improve the physical properties of the paper, thereby improving the properties of the colored paper.
In the prior art, before paper dyeing, nanocellulose and dye are mixed, so that the nanocellulose is loaded with the dye, and then the dye is added into paper pulp to manufacture paper, thus, although the amount of the dye loaded by the nanocellulose can be increased, the combination of the nanocellulose and the dye can reduce the number of accessible functional groups of the nanocellulose and the dye, the combination capability of the nanocellulose/dye and the paper pulp in the subsequent paper dyeing process is seriously reduced, the dye is easy to fall off, the improvement effect of the nanocellulose on the paper performance is reduced, and the like.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides the colored paper and the preparation method thereof, which are efficient, simple, safe and environment-friendly, and the strength performance of the colored paper is improved by utilizing the nano-cellulose.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for preparing colored paper comprises the following steps:
according to the formula (0.01-0.3): (1-3) defibering the nanocellulose and the pulp in water according to the mass ratio to obtain mixed pulp;
adding a dye into the mixed slurry, heating to 20-90 ℃ under the condition of stirring, and then sequentially carrying out ultrasonic treatment and natural standing to obtain the dyed mixed slurry;
and making the dyed mixed pulp into paper to obtain colored paper.
Preferably, the ratio of nanocellulose and water is (0.01-0.3) g: (0.5-1.5) L.
Preferably, the nanocellulose and the paper pulp are evenly mixed at 500-10000 rpm after being defibered in water to obtain mixed slurry.
Preferably, the ratio of the dye to the mixed paste is (0.01-1) g: (0.5-1.5) L.
Preferably, the dye is added into the mixed slurry and then kept at the temperature for 1-3h, and then ultrasonic treatment and natural standing are carried out in sequence.
Preferably, the dye is added into the mixed slurry and stirred for 10-240 min.
Further, the stirring speed of adding the dye into the mixed slurry is 50-950 r/min.
Further, the dye and the mixed slurry are stirred, heated and subjected to ultrasonic treatment for 1-60 min.
Preferably, the dye and the mixed slurry are stirred, heated and ultrasonically treated, and then are naturally placed for 1-24 hours.
A colored paper obtained by the method for producing a colored paper according to any one of the above.
Compared with the prior art, the invention has the following beneficial technical effects:
the invention relates to a preparation method of colored paper, which is characterized in that nanocellulose and pulp are fluffed in water to obtain mixed pulp, so that the nanocellulose and the pulp fibers can be tightly combined, the nanocellulose is taken as a bridge, the binding force between the pulp fibers is improved, the performance of the paper can be improved, and then dye is added, the mixed pulp is heated, ultrasonically treated and naturally placed under the stirring condition, so that the formed mixed pulp can utilize the characteristics of large specific surface area and multiple functional groups of the nanocellulose, the retention of the dye in the subsequent paper sheet forming process is improved, the combining area is increased, the retention of fine fibers is obviously improved, the gaps among the fibers in the paper sheet forming process are filled and reduced, the dye loss is further reduced, and the colored paper with good strength performance is obtained. The invention can obviously improve the retention rate and the dispersibility of the dye, obtain ideal dyeing effect, and obviously improve the strength performance of the prepared colored paper.
Drawings
FIG. 1 is a block diagram showing the color density comparison obtained in example 1 of the present invention.
FIG. 2 is a diagram showing the comparison of color density obtained in example 2 of the present invention.
FIG. 3 is a block diagram showing the color density comparison obtained in comparative example 1 of the present invention.
FIG. 4 is a block diagram showing the color density contrast obtained in example 3 of the present invention.
FIG. 5 is an explanatory view of L, a, b.
Detailed Description
The nano-cellulose has the characteristics of nano-scale, high specific surface area, large length-diameter ratio and the like, can be tightly combined with paper pulp fibers when being added into paper pulp, improves the binding force among the paper pulp fibers, and has wide application prospect in the fields of medicine, chemical industry, papermaking, textile, composite materials and the like.
The invention relates to a preparation method of colored paper, which comprises the following specific steps:
1. adding 0.01-0.3g of nano-cellulose into the pulp formed by 1-3g of paper pulp in absolute dry quantity, adding water to 0.5-1.5L, defibering the nano-cellulose and the pulp, and uniformly mixing under 500-10000 revolutions to ensure that the nano-cellulose and the paper pulp are tightly combined to obtain mixed pulp;
2. adding 0.01-1g of dye into the mixed slurry, heating to 20-90 ℃, keeping for 1-3h, mechanically stirring for 10-240min from the beginning of heating at the speed of 50-950r/min, carrying out ultrasonic dispersion after heating and stirring for 1-60min, and finally soaking at normal temperature, namely naturally standing for 1-24h to complete dyeing;
3. and (4) making the dyed mixed slurry into paper by using a paper machine to obtain colored paper.
Example 1:
weighing 0.05g of nano-cellulose in an oven dry amount, adding the nano-cellulose into pulp formed by 1.9g of paper pulp, adding water to 1L to obtain mixed pulp, defibering the mixed pulp for 5000 turns, uniformly mixing the pulp, adding 0.02g of dye turquoise GL into the solution after the mixed pulp is uniformly mixed to obtain 0.002% of dye, heating the solution at the temperature of 40 ℃ for 1h, stirring the solution from the beginning of heating at the stirring speed of 500r/min for 1h, carrying out ultrasonic treatment after the heating and stirring, controlling the ultrasonic treatment time to be 10min, then soaking and dyeing the solution at normal temperature for 2h to dye the solution, and carrying out paper making on the dyed mixed pulp by using a paper machine to obtain colored paper.
The color performance and the strength performance of the colored paper prepared by adding the nano-cellulose are obviously improved compared with the colored paper prepared by not adding the nano-cellulose, the improvement of the color performance can be obviously observed by naked eyes, the color of the colored paper is darker, the color difference obtained by testing is 9.17, and the color density of the colored paper without adding the nano-cellulose is as follows: 0.20 percent of V, 0.30 percent of C, 0.12 percent of M and 0.10 percent of Y. The color density of the colored paper after adding the nano-cellulose is as follows: 0.28 percent of V, 0.41 percent of C, 0.18 percent of M and 0.12 percent of Y, as shown in the attached figure 1. The tensile strength is increased from 7.6N to 19.93N, the tear strength is increased from 541.327mN to 1153.26mN, and the strength performance is obviously improved.
The color difference is delta E and is calculated by the following formula,
△E＝[(△L*)2+(△a*)2+(△b*)2]1/2
explanation of the separate measurement of L, a, b, L, a, b for two sheets of paper by Exact densitometer is shown in FIG. 5, where the color difference can be represented by a single color difference symbol Δ E, which is defined as the total color difference of the sample, but cannot represent the deviation direction of the color difference of the sample, and the larger the value of Δ E, the larger the color difference.
Color difference range:
0-0.25: very small or none; 0.25-0.5: micro; 0.5-1.0: small to medium; 1.0-2.0: medium; 2.0-4.0: a difference exists; 4.0 or more: is very large;
example 2:
weighing 0.05g of nano-cellulose, adding the nano-cellulose into pulp formed by paper pulp with the absolute dry weight of 1.9g, adding water to 1L to obtain mixed pulp, defibering the mixed pulp for 5000 turns, uniformly mixing the pulp, adding 0.1g of dye medium yellow 3172 into the solution after uniformly mixing the mixed pulp, mixing the mixed pulp to obtain the dye with the concentration of 0.01%, heating the solution at the temperature of 40 ℃ for 1h, stirring the solution from the beginning of heating at the stirring speed of 500r/min for 1h, carrying out ultrasonic treatment after heating and stirring, controlling the ultrasonic treatment time to be 10min, then soaking and dyeing the solution at normal temperature for 2h to dye the solution, and papermaking the dyed mixed pulp by using a papermaking machine to obtain colored paper.
The color performance of the colored paper prepared by adding the nano-cellulose is obviously improved compared with that of the colored paper prepared without adding the nano-cellulose, the color difference is 10.01, and the color difference can be obviously observed by naked eyes. The color density was changed (as shown in fig. 2), and the color density of the colored paper without nanocellulose was: 0.13 percent of V, 0.09 percent of C, 0.22 percent of M and 0.81 percent of Y. The color density of the colored paper after adding the nano-cellulose is as follows: v0.16, C0.09, M0.31 and Y0.97.
Comparative example 1:
preparing 50ml of dye reactive blue 19 solution with the mass concentration of 0.015%, weighing 0.1g of nano-cellulose with the absolute dry weight, adding the nano-cellulose into the dye solution, heating to 60 ℃, mechanically stirring for 3 hours, and dyeing the nano-cellulose.
Then weighing paper pulp with the oven dry weight of 1.9g, adding water to 0.95L, fluffing by a fluffer at 3000 rpm to disperse well, adding the dye to make the concentration of the dye be 0.015%, heating to 60 ℃ for 1h, and mechanically stirring for 3h to obtain a slurry dispersion solution.
And adding the dyed nanocellulose into the slurry dispersion solution, then carrying out ultrasonic treatment for 30min, and then carrying out papermaking by using a papermaking machine to obtain colored paper.
The color performance of the colored paper prepared by adding the nano-cellulose is different from that of the colored paper prepared by not adding the nano-cellulose, and the color difference is 3.65. The color density was changed (as shown in fig. 3), and the color density of the colored paper without nanocellulose was: v0.32, C0.50, M0.19 and Y0.12. The color density of the colored paper after adding the nano-cellulose is as follows: v0.34, C0.54, M0.20 and Y0.13. However, since the nanocellulose is firstly dyed and then added into the paper pulp for papermaking, the binding capacity of the nanocellulose/dye and the paper pulp in the subsequent paper dyeing process is seriously reduced, although the obtained paper color is still improved, the problems of uneven paper color, easy dye falling and the like are easily caused, the color performance is not as good as that of the paper made by firstly mixing the nanocellulose and the paper pulp and then dyeing, the improvement effect of the nanocellulose on the paper performance is reduced, and the strength performance of the paper is not obviously improved. The tensile strength increased from 27.60N to 34.05N and the tear strength increased from 1106.23mN to 1108.81 mN.
Example 3:
weighing 0.03g of nanocellulose in an oven-dry amount, adding the nanocellulose into pulp formed by 1.9g of paper pulp, adding water to 1L to obtain mixed pulp, defibering the mixed pulp for 5000 turns, uniformly mixing the nanocellulose, adding 0.05g of dye reactive red 195 into the solution after the mixed pulp is uniformly mixed to obtain the dye with the concentration of 0.005%, heating the solution at the temperature of 60 ℃ for 1h, stirring the solution from the beginning of heating at the stirring speed of 500r/min for 1h, carrying out ultrasonic treatment after heating and stirring, controlling the ultrasonic treatment time to be 10min, then soaking and dyeing the solution at normal temperature for 2h to dye the solution, and carrying out paper making on the dyed mixed pulp by using a paper machine to obtain colored paper.
The color performance of the colored paper prepared by adding the nano-cellulose is improved compared with that of the colored paper prepared without adding the nano-cellulose, and the color difference is 3.32. The color density of the colored paper without the nano-cellulose is as follows: 0.13 percent of V, 0.09 percent of C, 0.17 percent of M and 0.12 percent of Y. The color density of the colored paper after adding the nano-cellulose is as follows: 0.15 percent of V, 0.09 percent of C, 0.20 percent of M and 0.14 percent of Y, as shown in the attached figure 4. Although the color difference is small compared to the first two examples, it is related to parameters such as the type and amount of dye, and is not very relevant to the strength properties of the colored paper.
Example 4:
weighing 0.01g of nano-cellulose in an oven dry amount, adding the nano-cellulose into a pulp formed by 1g of paper pulp, adding water to 0.5L to obtain a mixed pulp, defibering the mixed pulp for 8000 turns, uniformly mixing the pulp, adding 0.01g of dye turquoise GL into the solution after uniformly mixing the pulp, mixing the solution until the temperature of the solution is 25 ℃ for 2 hours, stirring the solution at the beginning of heating at the stirring speed of 50r/min for 10 minutes, carrying out ultrasonic treatment after heating and stirring, controlling the ultrasonic treatment time to be 1min, soaking and dyeing the solution at normal temperature for 1 hour, and papermaking the dyed mixed pulp by using a papermaking machine to obtain colored paper.
Example 5:
weighing 0.3g of nanocellulose in an oven-dry amount, adding the nanocellulose in a pulp formed by 3g of paper pulp, adding water to 1.5L to obtain a mixed pulp, defibering the mixed pulp for 10000 r to uniformly mix the nanocellulose, after uniformly mixing the nanocellulose and the pulp, adding 1g of dye active red 195 into the solution, mixing the solution to heat the solution at 90 ℃ for 3h, stirring the solution from the beginning of heating at a stirring speed of 950r/min for 4h, carrying out ultrasonic treatment after heating and stirring, controlling the ultrasonic treatment time to be 60min, then soaking and dyeing the solution at normal temperature for 24h, and papermaking the dyed mixed pulp by using a papermaking machine to obtain colored paper.
Claims (10)
1. The preparation method of the colored paper is characterized by comprising the following steps:
according to the formula (0.01-0.3): (1-3) defibering the nanocellulose and the pulp in water according to the mass ratio to obtain mixed pulp;
adding a dye into the mixed slurry, heating to 20-90 ℃ under the condition of stirring, and then sequentially carrying out ultrasonic treatment and natural standing to obtain the dyed mixed slurry;
and making the dyed mixed pulp into paper to obtain colored paper.
2. The method of claim 1, wherein the ratio of nanocellulose to water is (0.01-0.3) g: (0.5-1.5) L.
3. The method as claimed in claim 1, wherein the pulp is dispersed in water and then mixed uniformly at 500-10000 rpm to obtain the mixed slurry.
4. The method of claim 1, wherein the ratio of the dye to the mixed size is (0.01-1) g: (0.5-1.5) L.
5. The method for preparing colored paper according to claim 1, wherein the dye is added into the mixed slurry and then kept at the temperature for 1-3h, and then sequentially subjected to ultrasonic treatment and natural standing.
6. The method of claim 1, wherein the dye is added to the mixed slurry and stirred for 10-240 min.
7. The method of claim 6, wherein the dye is added to the mixed slurry at a stirring rate of 50 to 950 r/min.
8. The method for preparing colored paper according to claim 7, wherein the dye and the mixed slurry are stirred, heated and then subjected to ultrasonic treatment for 1-60 min.
9. The method for preparing colored paper according to claim 1, wherein the dye and the mixed slurry are stirred, heated and ultrasonically treated and then naturally placed for 1-24 hours.
10. A colored paper obtained by the method for producing a colored paper according to any one of claims 1 to 9.
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| CN202110353624.1A CN113047080A (en) | 2021-03-31 | 2021-03-31 | Colored paper and preparation method thereof |
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| CN202110353624.1A CN113047080A (en) | 2021-03-31 | 2021-03-31 | Colored paper and preparation method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113863055A (en) * | 2021-10-13 | 2021-12-31 | 浙江舜浦新材料科技有限公司 | Preparation method of colored paper yarn base paper |
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