CN111826984A - Method for improving softness of high-yield bamboo pulp fibers through ultrasonic-assisted ozone treatment - Google Patents
Method for improving softness of high-yield bamboo pulp fibers through ultrasonic-assisted ozone treatment Download PDFInfo
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- CN111826984A CN111826984A CN202010683525.5A CN202010683525A CN111826984A CN 111826984 A CN111826984 A CN 111826984A CN 202010683525 A CN202010683525 A CN 202010683525A CN 111826984 A CN111826984 A CN 111826984A
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C3/00—Pulping cellulose-containing materials
- D21C3/22—Other features of pulping processes
- D21C3/224—Use of means other than pressure and temperature
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/002—Modification of pulp properties by chemical means; preparation of dewatered pulp, e.g. in sheet or bulk form, containing special additives
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21C—PRODUCTION OF CELLULOSE BY REMOVING NON-CELLULOSE SUBSTANCES FROM CELLULOSE-CONTAINING MATERIALS; REGENERATION OF PULPING LIQUORS; APPARATUS THEREFOR
- D21C9/00—After-treatment of cellulose pulp, e.g. of wood pulp, or cotton linters ; Treatment of dilute or dewatered pulp or process improvement taking place after obtaining the raw cellulosic material and not provided for elsewhere
- D21C9/001—Modification of pulp properties
- D21C9/007—Modification of pulp properties by mechanical or physical means
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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
- D21H11/00—Pulp or paper, comprising cellulose or lignocellulose fibres of natural origin only
- D21H11/12—Pulp from non-woody plants or crops, e.g. cotton, flax, straw, bagasse
Abstract
The invention discloses a method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment, and belongs to the field of pulping and papermaking. The method is characterized by mainly comprising the following steps: (1) pulping the fiber raw material until the beating degree is 25-35 DEG SR; (2) adding water to adjust the mass concentration of the fiber slurry to 0.01-5 wt%, putting the diluted slurry into an ultrasonic generator for ultrasonic treatment, wherein the ultrasonic frequency is 15-35 kHz, the power is 50-1200W, and maintaining the temperature by using an ice-water bath for 10-120 min; (3) heating the slurry obtained in the step (2) to 10-80 ℃, introducing ozone gas, and acting for 1-10 min; (4) the individual fiber softness of the fibers obtained in step (3) was quantitatively analyzed in the same manner. The invention adopts ultrasonic wave and ozone to treat the paper pulp fiber, and opens the fiber structure through the acoustic cavitation effect of the ultrasonic wave, thereby promoting the efficiency of subsequent ozone treatment and improving the flexibility of single fiber.
Description
Technical Field
The invention belongs to the field of pulping and papermaking, and particularly relates to a method for improving the softness of high-yield bamboo pulp fibers through ultrasonic-assisted ozone treatment.
Background
In china, bamboo pulp is a long-standing paper making material, and bamboos produced in china account for about 25% of the world. Compared with wood pulp, bamboo pulp has many advantages, in terms of raw materials, the growth cycle of bamboo is short, the bamboo pulp fiber resource is rich, therefore, the bamboo pulp fiber has great advantages in price, and the raw material cost is obviously saved. The bamboo pulp fiber is long and thin and has excellent paper forming performance when applied to the papermaking industry, and the internal composition of the bamboo pulp fiber has high cellulose content. However, the bamboo pulp fiber has some problems which cannot be ignored in the using process. For example, the bamboo pulp fiber is very stiff due to the fact that the inner cavity of the bamboo pulp fiber is circular and small, the fiber structure is relatively compact, for the high-yield bamboo pulp fiber, due to the influence of the pulping process, the content of lignin in the fiber is high, and the high-yield bamboo pulp fiber is poor in softness due to the series of factors. The softness of high-yield bamboo pulp fiber directly affects its application in many fields, such as paper products for daily use. Therefore, it is necessary and practical to find a method for effectively improving the softness of the high-yield bamboo pulp fiber.
Ozone, as a strong oxidant, can react with lignin to remove lignin from the fibers, thereby improving the softness of the bamboo pulp fibers. Compared with the traditional method for improving the softness of the fibers, the method has a series of advantages of low cost, quick treatment process, good effect, environmental friendliness and the like. However, the ozone treatment is often performed on the surface of the fiber, and the improvement of the softness performance is limited. The acoustic cavitation effect of ultrasonic wave can destroy the fiber structure for fibre inner structure exposes, is favorable to follow-up ozone to get into the inside and fibre of bamboo pulp fibre and reacts, thereby has improved the fibrous efficiency of ozone treatment, has improved fibrous softness performance simultaneously.
Disclosure of Invention
The invention provides a method capable of obviously improving the softness of high-yield bamboo pulp fibers, which utilizes the acoustic cavitation effect of ultrasonic waves, opens the compact structure of the bamboo pulp fibers while improving the softness of the fibers, and is beneficial to ozone molecules to enter the interior of the bamboo pulp fiber structure in the subsequent ozone treatment process, thereby providing a larger effective contact area for ozone treatment.
The invention provides a method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment, which can improve the accessibility of ozone to the high-yield bamboo pulp fibers through ultrasonic pretreatment, thereby improving the efficiency of improving the softness of the fibers by ozone treatment, reducing the using amount of ozone and saving the cost.
The technical method of the invention is summarized as follows:
a method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment comprises the following steps:
step 1: pulping the high-yield bamboo pulp fiber raw material until the pulping degree is 25-35 DEG SR or performing latency defibering; obtaining fiber slurry;
step 2: adding water to adjust the mass concentration of the fiber slurry to 0.01-5 wt%, putting the diluted slurry into an ultrasonic generator, setting the action frequency of the ultrasonic generator to be 15-35 kHz and the power to be 50-1200W, maintaining the reaction temperature at room temperature by using an ice-water bath, and performing ultrasonic action for 10-120 min;
and step 3: heating the high-yield bamboo pulp fiber material obtained in the step 2 to 10-80 ℃ in a water bath, adjusting the concentration of the pulp to 0.5-8 wt%, and enabling the use amount of ozone to be 0.01-2 wt% (relative to the bamboo pulp fiber), wherein the action time of the ozone is 1-10 min;
and 4, step 4: and (3) squeezing out moisture from the fiber slurry obtained in the step (3), and measuring the softness of the single fiber by a method for quantitatively analyzing the softness of the fiber by measuring the bending degree of the fiber by a glass-metal wire method.
The invention adopts ultrasonic to process the slurry, when the fiber-water interface is affected by ultrasonic, the bubbles on the interface deform and disintegrate suddenly, micro air flow is generated on the surface of the fiber, the surface structure of the fiber is damaged, the devillicate brooming degree of the fiber is improved, the flexibility of the fiber is improved, and the contact area of the ozone processing fiber is increased. The method combining ultrasonic treatment and ozone treatment is simple and convenient to operate, green and safe, and has little environmental pollution; compared with pure ozone treatment, the method improves the efficiency of ozone treatment and has important significance for improving the softness of the bamboo pulp fiber.
Drawings
Fig. 1 is an SEM picture of raw high yield bamboo pulp fiber. FIG. 2 is SEM picture of high yield bamboo pulp fiber treated by ultrasonic wave (600W, 45 min). FIG. 3 is SEM picture of high yield bamboo pulp fiber after ultrasonic (600W, 45min) pretreatment and ozone treatment (0.1 wt% ozone amount, 5min treatment time). FIG. 4 is SEM picture of high yield bamboo pulp fiber treated with ozone without ultrasonic pretreatment (0.1 wt% ozone amount, 5min treatment time).
As can be seen from FIG. 1, the untreated high-yield bamboo pulp fiber has a smooth and complete surface, is stiff and has poor softness; FIG. 2 is an SEM picture of high-yield bamboo pulp fibers after ultrasonic treatment, and it is obvious that the ultrasonic treatment damages the compact surface structure of the fibers, so that the structure becomes loose, the devillicate brooming phenomenon appears on the surface, and the structure of the bamboo pulp fibers is opened; FIG. 3 is a picture of high-yield bamboo pulp fibers treated by ultrasonic waves and ozone, and it can be seen that the softness of the bamboo pulp fibers is further improved after the ozone treatment; FIG. 4 is a photograph showing the high yield bamboo pulp fiber treated directly with ozone without ultrasonic pretreatment, and it can be seen that the surface structure of the fiber is not greatly changed, but only a relatively small amount of fibrillation occurs, and the improvement of the softness is not large. As can be seen from the detailed comparison between fig. 3 and fig. 4, the ultrasonic pretreatment can effectively open the compact structure of the high-yield bamboo pulp fiber, provide a channel for ozone molecules to enter the fiber structure, and promote the ozone treatment efficiency, thereby further improving the softness of the high-yield bamboo pulp fiber.
Detailed Description
The invention will be more fully and more readily understood by reference to the following examples, which are given to illustrate the invention more clearly, and are not intended to limit the invention in any way.
Ozone gas of each embodiment case is generated by an ozone generator, the ozone generator is manufactured by Shenzhen Feili electrical appliance science and technology Limited, and the product model is FL-815Y; the ultrasonic generator of each embodiment was a scientific-II D-type ultrasonic generator. And are not intended to limit the invention.
Example 1
A method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment comprises the following steps:
step 1: pulping the high-yield bamboo pulp until the pulping degree is 35 DEG SR; obtaining fiber slurry;
step 2: taking five parts of bamboo pulp fiber slurry with equal quality and high yield, respectively adding water to adjust the mass concentration of the fiber slurry to 0.1 wt%, respectively placing the five parts of the slurry into an ultrasonic instrument to act for 0min, 15min, 45min, 75min and 105min, wherein the ultrasonic power is 400W and 500W respectively, and the heat emitted during the action of ultrasonic wave is absorbed by an ice water bath.
And step 3: and (3) squeezing the fiber slurry obtained in the step (2) to remove water, and measuring the softness of the single fiber by a method for quantitatively analyzing the softness of the fiber by measuring the bending degree of the fiber by a glass-metal wire method. See tables 1 and 2.
TABLE 1 influence of the duration of the ultrasonication on the softness of the high yield bamboo pulp fibers at an ultrasonic power of 400W
TABLE 2 influence of the duration of the ultrasonic action on the softness of the high yield bamboo pulp fibers at an ultrasonic power of 600W
As can be seen from tables 1 and 2, the softness of the high-yield bamboo pulp fibers is obviously improved along with the increase of the ultrasonic treatment time, which indicates that the ultrasonic treatment damages the compact structure of the fibers, opens the wall cavity structure of the fibers and improves the softness of the fibers; it is also seen that increasing the sonication power also significantly improved the fiber softness. This indicates that increasing the power can further disrupt the fiber structure, further promoting subsequent ozone treatment efficiency.
Example 2
A method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment comprises the following steps:
step 1: pulping the high-yield bamboo pulp until the pulping degree is 35 DEG SR; obtaining fiber slurry;
step 2: taking five parts of bamboo pulp fiber slurry with equal quality and high yield, respectively adding water to adjust the mass concentration of the fiber slurry to 0.1%, respectively placing the five parts of the slurry into an ultrasonic instrument to act for 0min, 10min, 40min, 70min and 90min, wherein the ultrasonic power is 400W and 600W respectively, and the heat emitted during the action is absorbed by an ice water bath during the action of ultrasonic waves.
And step 3: and (3) adjusting the mass concentration of the high-yield bamboo pulp fiber pulp obtained in the step (2) to 4 wt%, heating to 30 ℃, introducing ozone to ensure that the mass fractions of the ozone are 0.6 wt%, allowing the ozone to act for 5min, and adjusting the pH value to 2.5.
And 4, step 4: and (3) squeezing out moisture from the fiber slurry obtained in the step (3), and measuring the softness of the single fiber by a method for quantitatively analyzing the softness of the fiber by measuring the bending degree of the fiber by a glass-metal wire method. See tables 3 and 4.
And 5: taking five parts of fiber pulp with equal mass (without ultrasonic pretreatment), adding water to adjust the mass concentration of the fiber pulp to 4 wt%, heating to 30 ℃, adjusting the pH value to 2.5, introducing different amounts of ozone into the five parts to ensure that the mass fractions of the ozone are 0.3 wt%, 0.6 wt%, 1.2 wt% and 1.5 wt%, and allowing the ozone to act for 5 min;
step 6: and (4) squeezing water out of the fiber pulp obtained in the step (5), measuring the softness of single fiber by measuring the bending degree of the fiber by a glass-metal wire method to quantitatively analyze the softness of the fiber, and comparing the softness with the high-yield bamboo pulp fiber added with ultrasonic pretreatment. See table 5.
TABLE 3 influence of the ultrasonic action time (0.6 wt% ozone, 5min ozone action time) at 400W of ultrasonic power on the softness of high-yield bamboo pulp fibers
TABLE 4 influence of ultrasonic action time (0.6 wt% ozone, 5min ozone action time) on softness of high-yield bamboo pulp fiber at 600W ultrasonic power
TABLE 5 influence of ozone dosage on softness of high yield bamboo pulp fiber (without ultrasonic pretreatment)
As shown in Table 3, the combination of the ultrasonic pretreatment (400W) and the ozone treatment can effectively improve the softness of the high-yield bamboo pulp fiber, the softness increases with the increase of the ultrasonic treatment time, and when the ultrasonic treatment time reaches 105min, the softness of the fiber is 28.3 x 10^ 14/(N.m m)2) The softness of the high-yield bamboo pulp fiber is obviously higher than that of the high-yield bamboo pulp fiber with the ultrasonic power of 600W in the table 2 (25.5 multiplied by 10^ 14/(N.m)2) This shows that the ozone treatment can effectively improve the softness of the high-yield bamboo pulp fiber; as shown in Table 4, when the ultrasonic power is increased to 600W, the softness of the high-yield bamboo pulp fiber can reach 32.1 x 10^ 14/(N.m) after 0.6 wt% ozone treatment (5min)2). The ultrasonic power is increased, so that the softness of the fiber can be effectively improved. As shown in Table 5, it was found that the softness of the high-yield bamboo pulp fiber could only reach 21.6X 10^ 14/(N.m) even if the ozone amount was 1.2 wt% (5min after ozone treatment) after directly treating the high-yield bamboo pulp fiber with ozone without ultrasonic pretreatment2). The method shows that the softness of the fibers of the high-yield bamboo pulp is improved only by using ozone for treatment, the efficiency of improving the softness of the fibers of the high-yield bamboo pulp by ozone treatment is obviously improved after the ultrasonic pretreatment is added, and the method can effectively destroy the compact structure of the high-yield bamboo pulp fibers, open the cell wall structure of the fibers, promote subsequent ozone molecules to enter the fibers and further improve the efficiency of ozone treatment due to the acoustic cavitation of ultrasonic waves.
Claims (4)
1. A method for improving the softness of high-yield bamboo pulp fibers by ultrasonic-assisted ozone treatment is characterized by comprising the following steps:
step 1: pulping the fiber raw material until the beating degree is 25-35 DEG SR or performing latency defibering to obtain pulp fiber;
step 2: adding water to adjust the mass concentration of the fiber slurry to 0.01-5 wt%, putting the diluted slurry into an ultrasonic generator, setting the action frequency of the ultrasonic generator to be 15-35 kHz and the power to be 50-1200W, and maintaining the temperature by using an ice-water bath for 10-120 min;
and step 3: heating the material obtained in the step (2) to 10-80 ℃, adjusting the concentration of the slurry to 0.5-8 wt%, adjusting the pH value to 1-4, introducing ozone gas, and treating the ozone for 1-10 min, wherein the amount of the ozone is 0.01-2 wt% (relative to the bamboo pulp fiber);
and 4, step 4: and (4) squeezing the water out of the material obtained in the step (3), and measuring the bending degree of the fiber by using a glass-metal wire method to quantitatively analyze the softness of the single fiber.
2. The method of claim 1, wherein: the action frequency of the ultrasonic generator is 15 kHz-35 kHz; the action power of the ultrasonic generator is 50W-1200W; the action time of the ultrasonic generator is 10 min-120 min.
3. The method of claim 1, wherein: the ozone action temperature is 10-80 ℃; the mass concentration of the ozone treatment slurry is 0.5-8 wt%; the pH value is adjusted to 1-4 in the ozone treatment process, and the ozone treatment time is 1-10 min; the ozone dosage is 0.01 wt% -2 wt%.
4. The method of claim 1, wherein: the softness of the fibers was measured using the glass-wire method.
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- 2020-07-09 CN CN202010683525.5A patent/CN111826984A/en active Pending
Patent Citations (7)
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| CN106283830A (en) * | 2016-07-29 | 2017-01-04 | 天津科技大学 | A kind of method improving paper for daily use pliability |
| CN108071038A (en) * | 2017-12-15 | 2018-05-25 | 天津科技大学 | A kind of method for improving bamboo pulp fiber pliability |
| CN108729286A (en) * | 2018-05-23 | 2018-11-02 | 天津科技大学 | A method of improving tobacco pulp fiber flexibility |
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