CN111719338A - Production process of high-whiteness vulcanized fiber paper - Google Patents
Production process of high-whiteness vulcanized fiber paper Download PDFInfo
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- CN111719338A CN111719338A CN202010621018.9A CN202010621018A CN111719338A CN 111719338 A CN111719338 A CN 111719338A CN 202010621018 A CN202010621018 A CN 202010621018A CN 111719338 A CN111719338 A CN 111719338A
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- chloride solution
- zinc chloride
- whiteness
- fiber paper
- vulcanized fiber
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- 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
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- 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
- D21H25/00—After-treatment of paper not provided for in groups D21H17/00 - D21H23/00
- D21H25/04—Physical treatment, e.g. heating, irradiating
- D21H25/06—Physical treatment, e.g. heating, irradiating of impregnated or coated paper
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Abstract
The invention discloses a production process of high-whiteness vulcanized fiber paper, which is characterized in that a finished vulcanized fiber paper product is obtained by soaking a plurality of layers of vulcanized fiber paper base paper in a soaking pool by a zinc chloride solution, and then gelling, aging, desalting, drying and hot pressing; and taking out the zinc chloride solution subjected to the desalting step, introducing 3-8 parts by mass of ozone into 0.5-2 parts by mass of zinc chloride solution at a rate of 3-8 parts/min, standing for 50-70min, concentrating the zinc chloride solution after standing until the mass concentration is over 65%, and then adding hydrogen peroxide to change the color of the zinc chloride solution from black to light yellow so as to realize the recovery treatment of the zinc chloride solution. The method can purify the colored groups in the zinc chloride solution after the desalting step, so that the zinc chloride solution is clear and transparent, and the clear and transparent zinc chloride solution is used for the production of the vulcanized fiber paper, thereby greatly improving the whiteness and the quality of finished products of the vulcanized fiber paper.
Description
Technical Field
The invention relates to the technical field of papermaking production, in particular to a production process of high-whiteness vulcanized fiber paper.
Background
With the application of vulcanized fiber paper in various fields, the demand of vulcanized fiber paper is increasing day by day, and the requirement on the whiteness of vulcanized fiber paper is stricter and stricter. Chinese patent application publication No. CN201710563027.5 discloses an environment-friendly vulcanized fiber paper and a production process thereof, wherein the vulcanized fiber paper is subjected to desalting and cleaning processes and then is subjected to desalting treatment in a desalting tankWith a lower concentration of ZnCl2Solution, thus ZnCl, in the process of vulcanized fibre production2The solution can be recycled for many times or the soaking time is too long, which can cause ZnCl2A large amount of short chain fibers are accumulated in the solution, so that organic matters are inevitably polluted, and the bonding strength of the vulcanized fiber paper is reduced. Due to ZnCl2The solution chroma is the main factor affecting the whiteness of the vulcanized fiber paper, in ZnCl2In the process of using the solution for multiple times, colored groups are trapped on the surface of the vulcanized fiber paper, so that the whiteness and the interlayer bonding strength of the vulcanized fiber paper are seriously influenced, the whiteness of the vulcanized fiber paper produced at home at present is below 75 percent ISO, and how to carry out ZnCl in the vulcanized fiber paper production process2Solution recycling and how to use the recovered ZnCl2The solution production of vulcanized fiber paper with higher whiteness is an urgent problem to be solved by the applicant.
Disclosure of Invention
The invention aims to provide a production process of high-whiteness vulcanized fiber paper. The method can purify the colored groups in the zinc chloride solution after the desalting step, so that the zinc chloride solution is clear and transparent, and the clear and transparent zinc chloride solution is used for the production of the vulcanized fiber paper, thereby greatly improving the whiteness and the quality of finished products of the vulcanized fiber paper.
The technical scheme of the invention is as follows: a production process of vulcanized fibre paper with high whiteness comprises the steps of soaking a plurality of layers of vulcanized fibre paper base paper in a zinc chloride solution in a soaking tank, gelatinizing, aging, desalting, drying and hot pressing to obtain a vulcanized fibre paper finished product; and taking out the zinc chloride solution subjected to the desalting step, introducing 3-8 parts by mass of ozone into 0.5-2 parts by mass of zinc chloride solution at a rate of 3-8 parts/min, standing for 50-70min, concentrating the zinc chloride solution after standing until the mass concentration is over 65%, and then adding hydrogen peroxide to change the color of the zinc chloride solution from black to light yellow so as to realize the recovery treatment of the zinc chloride solution.
In the production process of the high-whiteness vulcanized fiber paper, the concentrated zinc chloride solution is concentrated at a high temperature of 140 ℃ at 100-.
In the production process of the high-whiteness vulcanized fiber paper, the hydrogen peroxide is added until the mass concentration of the hydrogen peroxide in the concentrated zinc chloride solution reaches 2-5%, and then the zinc chloride solution is kept stand for 50-70min, so that the color of the zinc chloride solution is changed from black to light yellow.
According to the production process of the high-whiteness vulcanized fiber paper, 5min of ozone is introduced into 1 part of zinc chloride solution according to the mass part at the rate of 5 parts/min, the mixture is kept stand for 60min, then high-temperature concentration is carried out at 120 ℃, the mass concentration of the zinc chloride solution is concentrated to be more than 65%, then hydrogen peroxide is added into the concentrated zinc chloride solution at 70 ℃ until the mass concentration of the hydrogen peroxide reaches 3%, and the mixture is kept stand for 60min, so that the color of the zinc chloride solution is changed from black to light yellow.
In the production process of the high-whiteness vulcanized fiber paper, the mass concentration of the zinc chloride solution after the desalting step is 25-35%.
Compared with the prior art, the zinc chloride solution subjected to the desalting step is recycled, ozone is firstly introduced, then the zinc chloride solution is kept stand, the zinc chloride solution is concentrated after the zinc chloride solution is kept stand, hydrogen peroxide is then added until the color of the zinc chloride solution is changed from black to light yellow, and the recycling of the zinc chloride solution is completed. . In addition, the invention further improves the whiteness and the quality of the vulcanized fiber paper by optimizing the process and the process parameters.
Drawings
FIG. 1 is a zinc chloride solution recovered from a desalination tank;
FIG. 2 shows the zinc chloride solution after the recovery treatment of the present invention.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example 1: a production process of vulcanized fibre paper with high whiteness comprises the steps of soaking a plurality of layers of vulcanized fibre paper base paper in a zinc chloride solution in a soaking tank, gelatinizing, aging, desalting, drying and hot pressing to obtain a vulcanized fibre paper finished product; after the desalting step, taking out 120 liters of 28% zinc chloride solution from a desalting tank, selecting 100ml of zinc chloride solution by using a test tube to test as shown in figure 1, introducing ozone into the zinc chloride solution at the speed of 0.4L/min for 5min, standing for 55min, then performing high-temperature concentration at 110 ℃, concentrating the zinc chloride solution to over 65% by mass, adding hydrogen peroxide into the concentrated zinc chloride solution at 72 ℃ until the mass concentration of the hydrogen peroxide in the concentrated zinc chloride solution reaches 2.5%, and standing for 65min, so that the color of the zinc chloride solution is changed from black to light yellow as shown in figure 2, thereby realizing the recovery treatment of the zinc chloride solution; and finally, recovering 120 liters of zinc chloride solution recovered from the desalting tank according to the recovery steps of the zinc chloride solution, and adding the recovered zinc chloride solution into the soaking tank again for producing the white vulcanized fiber paper.
Example 2: a production process of vulcanized fibre paper with high whiteness comprises the steps of soaking a plurality of layers of vulcanized fibre paper base paper in a zinc chloride solution in a soaking tank, gelatinizing, aging, desalting, drying and hot pressing to obtain a vulcanized fibre paper finished product; after the desalting step, taking out 80 liters of 33% zinc chloride solution from a desalting tank, introducing ozone into the zinc chloride solution at a rate of 0.6L/min for 6min according to the mass parts per liter of the zinc chloride solution, standing for 65min, then performing high-temperature concentration at 130 ℃, concentrating the mass concentration of the zinc chloride solution to over 65%, then adding hydrogen peroxide into the concentrated zinc chloride solution at 68 ℃ until the mass concentration of the hydrogen peroxide in the concentrated zinc chloride solution reaches 3.5%, and standing for 70min again to convert the color of the zinc chloride solution from black to light yellow so as to realize the recovery treatment of the zinc chloride solution; and the recovered zinc chloride solution is added into the soaking pool again for producing the white vulcanized fibre paper.
Example 3: a production process of vulcanized fibre paper with high whiteness comprises the steps of soaking a plurality of layers of vulcanized fibre paper base paper in a zinc chloride solution in a soaking tank, gelatinizing, aging, desalting, drying and hot pressing to obtain a vulcanized fibre paper finished product; after the desalting step, taking out 100 liters of 33% zinc chloride solution from a desalting tank, introducing ozone into each liter of zinc chloride solution at the speed of 0.5L/min according to the mass part for 5min, standing for 60min, then performing high-temperature concentration at 120 ℃, concentrating the mass concentration of the zinc chloride solution to over 65%, then adding hydrogen peroxide into the concentrated zinc chloride solution at 70 ℃ until the mass concentration of the hydrogen peroxide in the concentrated zinc chloride solution reaches 3%, standing for 60min again to change the color of the zinc chloride solution from black to light yellow, and adding the recovered zinc chloride solution into a soaking pool again for producing white vulcanized fiber.
Comparative example: and (4) vulcanized fiber paper prepared by adopting a conventional method.
The applicant tested the finished products prepared in examples 1-3 and the vulcanized fibre paper of the comparative example. The test item is whiteness, which is performed by a paper whiteness tester, and the final test result is shown in table 1.
| Whiteness ISO% | |
| Example 1 | 79 |
| Example 2 | 81 |
| Example 3 | 83 |
| Comparative example | 70 |
TABLE 1
As can be seen from table 1, the whiteness of the final vulcanized fiber paper in examples 1, 2 and 3 is greatly improved compared with vulcanized fiber paper prepared by the conventional method. The above results are caused because the zinc chloride solution is recycled, so that a large amount of short chain fibers are accumulated in the zinc chloride solution, organic pollution is inevitably caused, colored groups are continuously generated and trapped on the surface of the vulcanized fiber paper, the whiteness and the interlayer bonding strength of the vulcanized fiber paper are seriously influenced, and the whiteness of the vulcanized fiber paper is reduced. The invention can purify the color groups in the recycled zinc chloride solution by an oxidation method to ensure that the zinc chloride solution is clear and transparent, thereby fundamentally solving the problem that the whiteness of the vulcanized fiber and the bonding strength of the laminate are influenced because the color groups are intercepted on the surface of the vulcanized fiber. In addition, the whiteness of the vulcanized fiber paper in the embodiment 3 is higher than the whiteness of the vulcanized fiber paper in the embodiments 1 and 2, and the process parameter proportion is optimized, so that the finished product effect of the vulcanized fiber paper is further improved.
In conclusion, the method can purify the colored groups in the zinc chloride solution after the desalting step, so that the zinc chloride solution is clear and transparent, and the clear and transparent zinc chloride solution is used for the production of the vulcanized fiber paper, thereby greatly improving the whiteness and the finished product quality of the vulcanized fiber paper.
Claims (5)
1. A production process of vulcanized fibre paper with high whiteness comprises the steps of soaking a plurality of layers of vulcanized fibre paper base paper in a soaking pool by a zinc chloride solution, then gelling, aging, desalting, drying and hot pressing to obtain a vulcanized fibre paper finished product; the method is characterized in that: and taking out the zinc chloride solution subjected to the desalting step, introducing 3-8 parts by mass of ozone into 0.5-2 parts by mass of zinc chloride solution at a rate of 3-8 parts/min, standing for 50-70min, concentrating the zinc chloride solution after standing until the mass concentration is over 65%, and then adding hydrogen peroxide to change the color of the zinc chloride solution from black to light yellow so as to realize the recovery treatment of the zinc chloride solution.
2. The process for producing high-whiteness vulcanized fiber paper according to claim 1, wherein: the concentrated zinc chloride solution is concentrated at a high temperature of 140 ℃ at 100-.
3. The process for producing high-whiteness vulcanized fiber paper according to claim 1, wherein: adding hydrogen peroxide until the mass concentration of the hydrogen peroxide in the concentrated zinc chloride solution reaches 2-5%, and standing for 50-70min to change the color of the zinc chloride solution from black to light yellow.
4. The process for producing high-whiteness vulcanized fiber paper according to claim 1, wherein: introducing 5min of ozone into 1 part of zinc chloride solution according to the mass part at the speed of 5 parts/min, standing for 60min, then carrying out high-temperature concentration at 120 ℃, concentrating the mass concentration of the zinc chloride solution to over 65%, then adding hydrogen peroxide into the concentrated zinc chloride solution at 70 ℃ until the mass concentration reaches 3%, and standing for 60min to convert the color of the zinc chloride solution from black to light yellow.
5. Process for the production of high-whiteness vulcanized fiber paper according to any one of claims 1 to 4, characterized in that: the mass concentration of the zinc chloride solution after the desalting step is 25-35%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010621018.9A CN111719338A (en) | 2020-06-30 | 2020-06-30 | Production process of high-whiteness vulcanized fiber paper |
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| CN202010621018.9A CN111719338A (en) | 2020-06-30 | 2020-06-30 | Production process of high-whiteness vulcanized fiber paper |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870413A (en) * | 2022-04-14 | 2022-08-09 | 杭州特种纸业有限公司 | Recycling method of zinc chloride solution for vulcanized fiber paper |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147356A (en) * | 2013-03-07 | 2013-06-12 | 杭州特种纸业有限公司 | Abrasive steel paperboard and manufacturing process thereof |
| CN104944663A (en) * | 2015-05-30 | 2015-09-30 | 玛纳斯源源纸业有限公司 | Vulcanized paper recovery solution treatment technology |
-
2020
- 2020-06-30 CN CN202010621018.9A patent/CN111719338A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103147356A (en) * | 2013-03-07 | 2013-06-12 | 杭州特种纸业有限公司 | Abrasive steel paperboard and manufacturing process thereof |
| CN104944663A (en) * | 2015-05-30 | 2015-09-30 | 玛纳斯源源纸业有限公司 | Vulcanized paper recovery solution treatment technology |
Non-Patent Citations (1)
| Title |
|---|
| 周嫩民等: "过氧化氢在钢纸板生产中净化氯化锌胶化液的研究", 《化学工程师》 * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114870413A (en) * | 2022-04-14 | 2022-08-09 | 杭州特种纸业有限公司 | Recycling method of zinc chloride solution for vulcanized fiber paper |
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Application publication date: 20200929 |