阅读说明：本技术 一种高白度的钢纸的生产工艺 (Production process of high-whiteness vulcanized fiber paper ) 是由 金光范 许银超 周晓莹 于 2020-06-30 设计创作，主要内容包括：本发明公开了一种高白度的钢纸的生产工艺,该工艺将多层钢纸原纸在浸泡池中经氯化锌溶液浸泡后再经过胶化、老化、脱盐、烘干热压后得到钢纸成品；将经过脱盐步骤后的氯化锌溶液取出,按质量份向每0.5-2份氯化锌溶液内以3-8份/min的速率通入3-8min的臭氧,再静置50-70min,静置后浓缩氯化锌溶液至质量浓度在65％以上,然后加入过氧化氢使得氯化锌溶液的颜色从黑色转变成淡黄色,实现氯化锌溶液的回收处理。本发明可以净化脱盐步骤后的氯化锌溶液中的有色基团,使氯化锌溶液清澈透明,再利用氯化锌溶液清澈透明用于钢纸的生产,从而大大地提高了钢纸的白度和成品质量。(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.)

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%.

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.