CN113789680B

CN113789680B - Bamboo fiber fluff pulp and preparation method and application thereof

Info

Publication number: CN113789680B
Application number: CN202111086888.1A
Authority: CN
Inventors: 江国华; 施宇斐; 孙延芳; 刘天琦
Original assignee: Zhejiang Sci Tech University ZSTU
Current assignee: Zhejiang Sci Tech University ZSTU
Priority date: 2021-09-16
Filing date: 2021-09-16
Publication date: 2023-04-28
Anticipated expiration: 2041-09-16
Also published as: CN113789680A

Abstract

The invention relates to bamboo fiber fluff pulp and a preparation method and application thereof. The preparation method comprises the following steps: (1) preparation of base slurry: under the condition of room temperature, fully and uniformly fluffing and dispersing bamboo fibers and wood pulp fibers in water to obtain basic slurry; (2) modification treatment of paper pulp: under the condition of room temperature, sequentially adding a bond-releasing agent and a leavening agent into the basic slurry, mixing, and fluffing uniformly to obtain paper pulp; (3) preparation of fluff pulp: making the paper pulp into fluff pulp paper board, performing hot pressing treatment to obtain a paddle board, placing the paddle board in a sealed bag to balance moisture, and performing mechanical dry dissociation to obtain fluff pulp. The bond-releasing agent and the bulking agent are added to ensure good water absorption and cushion stability after the fluff pulp is filled, and the two components form synergistic action to jointly strengthen the weak combination of fibers and improve the fluffing property and water absorption of the bamboo fiber fluff pulp.

Description

Bamboo fiber fluff pulp and preparation method and application thereof

Technical Field

The invention belongs to the technical field of fluff pulp modification, and particularly relates to bamboo fiber fluff pulp and a preparation method and application thereof.

Background

The fiber material with high bulk and high water absorption is fluff pulp, and is filled in the core layer of sanitary articles such as sanitary towel, paper diaper and the like in a cotton-wool shape. In recent years, the quality of life of people is greatly improved, and consumers pay more attention to the use feeling of disposable sanitary products such as diaper and sanitary towel, and the demand for fluff pulp in China is continuously rising. The high-grade fluff pulp sold in the market at present is almost all of ocean brands, the production of domestic fluff pulp is relatively low-grade, and in recent years, imported commodity fluff pulp mainly comprises G.P brand gold island fluff pulp, french white gull brand fluff pulp, american Angel brand and Canada W.P brand and the like produced by Georgia Pacific company in the United states, and compared with imported commodity fluff pulp, the domestic fluff pulp has poorer fluffiness and poor absorption performance. Therefore, there is a need to develop a fluff technology for fluff pulp boards that improves the quality of domestic fluff pulp.

At present, most of products in the fluff pulp market use needle wood fibers as raw materials, and the produced fluff pulp fibers have good performance due to the characteristics of long fiber length, large thickness, low hemicellulose content, low impurity cell content and the like. While forest resources are relatively deficient, domestic fluff pulp manufacturers mostly use non-wood and broadleaf wood as raw materials to produce fluff pulp, although compared with needle-leaf wood fibers, the broadleaf wood fibers are shorter, and the liquid absorption capacity of the fluff pulp is greatly damaged by higher organic extract content (mainly resin). In addition, the short fiber length, and the presence of a large number of foreign cells in the fiber are unfavorable for the performances of integrity, bulk and the like of the fluff pulp core layer. The content of the mixed cells of the bamboo pulp is high, the combination strength of the pulp sheet is increased due to the presence of a large amount of mixed cells, so that the bursting strength of the pulp sheet is higher, the fiber cutting is serious during dry dissociation, and the dust amount is large.

The area of the bamboo forest in China is the second world, the yield of the bamboo forest is the first world, more than 70 bamboo plants in the world belong to more than 1000, and more than 40 bamboo plants in China belong to more than 500 bamboo plants in the world. Bamboo has the advantages of fast growth, large biomass, short felling period, capability of being continuously utilized by one-time planting, capability of harvesting bamboo every year without damaging bamboo forests, and the like. Therefore, abundant bamboo resources in China are fully utilized, and the method is beneficial to alleviating the tension situation of insufficient fiber raw materials for producing the fluff pulp by pertinently producing and developing the fluff pulp, so that the external dependency of the fluff pulp production is reduced.

Through researches, the defects caused by single bamboo fiber are improved by adding a certain content of wood pulp fiber and mixing the wood pulp fiber and the wood pulp fiber, the fluffing problem and the liquid absorption performance of the fluff pulp are solved by adding a bond-releasing agent and a bulking agent, and the fluffing performance of the fluff pulp is improved by adopting a hot pressing measure through a certain pulp sheet papermaking process and meets the product requirements of the fluff pulp.

Disclosure of Invention

Aiming at the defects existing in the prior art, the invention aims to provide bamboo fiber fluff pulp and a preparation method and application thereof.

In order to achieve the above purpose, the present invention adopts the following technical scheme:

a preparation method of bamboo fiber fluff pulp comprises the following steps:

(1) Preparation of base slurry

Under the condition of room temperature, fully and uniformly fluffing and dispersing bamboo fibers and wood pulp fibers in water to obtain basic slurry;

(2) Modification treatment of pulp

Under the condition of room temperature, sequentially adding a bond-releasing agent and a leavening agent into the basic slurry, mixing, and fluffing uniformly to obtain paper pulp;

(3) Preparation of fluff pulp

Making the paper pulp into fluff pulp paper board, performing hot pressing treatment to obtain a paddle board, placing the paddle board in a sealed bag to balance moisture, and performing mechanical dry dissociation to obtain fluff pulp.

According to the invention, the water absorption performance of single bamboo fiber is improved by mixing and fluffing the bamboo fiber and the wood pulp fiber, and the water absorption time and water absorption capacity of the mixed fiber are improved; and then the bond-releasing agent and the bulking agent are added and modified together in sequence, so that the water absorption performance of the mixed fiber is improved obviously. Wherein, the bamboo fiber is mixed with the wood pulp fiber, the content of the mixed cells in the mixed fiber is reduced, and the defect brought by single bamboo fiber is overcome.

Preferably, the bamboo fiber is one or a combination of a plurality of moso bamboo pulp fiber, arrowhead bamboo pulp fiber and Bai Zhuzhu carbon fiber.

Preferably, the wood pulp fiber is one or a combination of more of needle-leaved wood fiber, masson pine fiber, larch fiber, korean pine fiber and spruce fiber.

In the step (1), preferably, the weight ratio of the bamboo fiber to the wood fiber is 1:0.25 to 0.66 percent, and the mass fraction of the fiber in the basic slurry is 2 to 3 percent.

Preferably, the bond-breaking agent is one or a combination of more of coco trimethyl ammonium chloride, dimethyl dihydrogenated tallow ammonium chloride, aminosilane HD-M8252, aminosilane HD-M8373 and trimethyl stearyl ammonium chloride.

Preferably, the leavening agent is one or a combination of more of sodium bicarbonate, ammonium carbonate, calcium carbonate, sodium borohydride and sodium hydride.

As a preferable scheme, the dosages of the bond-releasing agent and the leavening agent are respectively 1-3 wt% of the basic sizing agent.

Preferably, in the step (3), the hot pressing treatment includes:

and after three-stage pressing, the blanket is dried after each stage of pressing, the front and back sides are pressed for 3-5 min, the pressing temperature is 100-110 ℃, and the paddle board is placed in a sealing bag to balance the water for 12-18 h after the paper making is finished.

The invention also provides bamboo fiber fluff pulp prepared by the preparation method according to any one of the schemes.

The invention also provides application of the bamboo fiber fluff pulp as a cushion core layer of the sanitary article.

Compared with the prior art, the invention has the following technical effects:

according to the treatment method for modifying the mixed fiber by adding the bond-breaking agent and the bulking agent, the silane bond-breaking agent is added, and after the amino functional group in the silane bond-breaking agent is bonded to the silicone oil skeleton, the orientation degree of the organosilicon molecules on the fiber is greatly improved, the affinity to the fiber is increased, and the super-soft, smooth and other performances of the mixed fiber are endowed; the bond-releasing agent can effectively reduce the combination between fibers, thereby being beneficial to the dry fluffing of the fluff pulp board, the physical gaps between the fibers are enlarged, and the tightness is naturally reduced. In addition, hydrophobic groups in the bond-releasing agent are arranged on the surface of the fiber, so that the smoothness of the fiber is improved, the fibers are not easy to intertwine, the sliding friction factor between the fibers is greatly reduced, the adopted solid-state bulking agent can also interpenetrate and adsorb particles on the surface of the fiber, the weak combination of fluff pulp fiber is facilitated, the fiber is easy to dissociate, soft and fluffy under the comprehensive action of the bond-releasing agent and the bulking agent, and the water absorption performance and the fluffiness are effectively improved.

The treatment method for modifying the mixed fiber by adding the bond-breaking agent and the leavening agent has the advantages of simplicity in operation, easiness in cleaning after slurry treatment and the like; the water absorption performance of the obtained fluff pulp is improved and reaches the national standard. Can be used as a material of high-end sanitary articles.

At present, most fluff pulp modification processes only add a bond-releasing agent, but the invention adds a bulking agent at the same time, so that the bond-releasing agent and the bulking agent play an important role, and have important effects on reducing the bursting strength of the pulp board and improving the fluff pulp fluffiness. However, the addition of the debonding agent results in a decrease in fluff pulp absorbency and mat strength. The addition of the bulking agent does not change the quantity of hydroxyl groups, only changes physically on the surface of the fluff pulp, avoids the damage to the strength of the fibers, ensures good water absorbability and cushion stability of the fluff pulp after filling, relatively reduces the addition of the bond releasing agent, and effectively improves the fluff pulp performance and the fluffiness of the fluff pulp by the combined action of the adding of the bulking agent.

The bamboo fiber is moisture-absorbing and breathable, warm in winter and cool in summer, and the cross section of the bamboo fiber is fully distributed with pores with elliptical shapes in large and small sizes, so that a large amount of moisture can be absorbed and evaporated instantaneously. The high degree of hollowness in natural cross-section makes bamboo fibers known to those skilled in the art as "respirable" fibers, also known as "fiber queen". The hygroscopicity, the moisture release and the air permeability of the bamboo fiber are at the beginning of each large textile fiber, so that the water absorption performance and the fluffiness of the fluff pulp can be greatly enhanced.

The bamboo fiber belongs to non-wood fiber, can alleviate the current situation that wood resources are hidden and lack and forest distribution is unreasonable in China to a certain extent, has the properties of natural antibiosis, bacteriostasis, deodorization and the like, and the fluff pulp prepared by taking the bamboo fiber as a main raw material has better protection effect without adding additional antibiosis agent.

Drawings

FIG. 1 is a flow chart of a method for preparing bamboo fiber fluff pulp according to example 1 of the present invention.

Detailed Description

The technical scheme of the invention is further explained by the following specific examples.

Example 1

As shown in fig. 1, the preparation method of the bamboo fiber fluff pulp of the embodiment comprises the following steps:

s1, preparing basic slurry

Under the condition of room temperature, the moso bamboo pulp fibers and the needle leaf wood board are sheared by simple machinery, and are added into a standard fiber fluffer to be fully and uniformly fluffed, and 800rpm is carried out in the standard fiber fluffer to obtain basic pulp;

wherein the mass concentration of the mixed fiber in the basic slurry is 3%, and the weight ratio of the bamboo fiber to the needle wood fiber is 1:0.25.

s2, modifying treatment of paper pulp

Under the condition of room temperature, adding an amino silane HD-M8252 serving as a bond-breaking agent into the basic slurry, adding a light calcium carbonate powder serving as a bulking agent, wherein the dosage of the amino silane HD-M8252 and the light calcium carbonate powder is 1% of that of the basic slurry, and obtaining the paper pulp after modification treatment in a standard fiber fluffer at 800 rpm.

S3, preparation of fluff pulp

And (3) in the papermaking and drying process, transferring the modified paper pulp into a fourdrinier to make a fluff pulp paper board, pressing the fluff pulp paper board by a press for three sections, changing a blanket to dry after each section of pressing, pressing the front and the back of the fluff pulp paper board for 3min at the pressing temperature of 100 ℃, making the pulp board with dryness of 90-94%, placing the pulp board into a sealing bag to balance moisture for 12h after the completion of the papermaking, and then carrying out mechanical dry dissociation to obtain the fluff pulp.

Example 2:

the preparation method of the bamboo fiber fluff pulp comprises the following steps:

s1, preparing basic slurry

Under the condition of room temperature, the white bamboo charcoal cotton fibers and the needle leaf wood board are sheared by simple machinery, and are added into a standard fiber fluffer to be fully and uniformly fluffed, and 800rpm is carried out in the standard fiber fluffer to obtain basic slurry;

wherein the mass concentration of the mixed fiber in the basic slurry is 3%, and the weight ratio of the white bamboo charcoal cotton fiber to the needle wood fiber is 1:0.25.

s2, modifying treatment of paper pulp

Under the condition of room temperature, adding an amino silane HD-M8373 serving as a bond-breaking agent into the basic slurry, adding a light calcium carbonate powder serving as a bulking agent, wherein the dosage of the amino silane HD-M8373 and the light calcium carbonate powder is 1% of that of the basic slurry, and obtaining the paper pulp after modification treatment in a standard defiberizer at 800 rpm.

S3, preparation of fluff pulp

And (3) in the papermaking and drying process, transferring the modified paper pulp into a fourdrinier to make a fluff pulp paper board, pressing the fluff pulp paper board by a press for three sections, changing a blanket to dry after each section of pressing, pressing the front and the back of the fluff pulp paper board for 4 minutes at the pressing temperature of 105 ℃, and placing the pulp board in a sealing bag to balance moisture for 12 hours after the papermaking is finished, and then carrying out mechanical dry dissociation to obtain the fluff pulp.

Example 3:

s1, preparing basic slurry

Under the condition of room temperature, the moso bamboo carbon fiber and the needle leaf wood board are sheared by simple machinery, and are added into a standard fiber fluffer to be fully and uniformly fluffed, and 800rpm is carried out in the standard fiber fluffer to obtain basic slurry;

wherein the mass concentration of the mixed fiber in the basic slurry is 2%, and the weight ratio of the moso bamboo charcoal fiber to the needle leaf wood fiber is 1:0.25.

s2, modifying treatment of paper pulp

S3, preparation of fluff pulp

And (3) in the papermaking and drying process, transferring the modified paper pulp into a fourdrinier to make a fluff pulp paper board, pressing the fluff pulp paper board by a press for three sections, changing a blanket to dry after each section of pressing, pressing the front and the back at the pressing temperature of 100 ℃ for 5min, and placing the pulp board in a sealing bag to balance moisture for 12h after the papermaking is finished, and then carrying out mechanical dry dissociation to obtain the fluff pulp.

Example 4:

s1, preparing basic slurry

wherein the mass concentration of the mixed fiber in the basic slurry is 3%, and the weight ratio of the white bamboo charcoal cotton fiber to the needle wood fiber is 1:0.66.

s2, modifying treatment of paper pulp

S3, preparation of fluff pulp

Example 5:

s1, preparing basic slurry

wherein the mass concentration of the mixed fiber in the basic slurry is 3%, and the weight ratio of the white bamboo charcoal cotton fiber to the needle wood fiber is 1:0.45.

s2, modifying treatment of paper pulp

S3, preparation of fluff pulp

Example 6:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

Under the condition of room temperature, adding an amino silane HD-M8252 serving as a bond-breaking agent into the basic slurry, adding a light calcium carbonate powder serving as a bulking agent, wherein the dosage of the amino silane HD-M8252 and the light calcium carbonate powder is 2% of that of the basic slurry, and obtaining the paper pulp after modification treatment in a standard fiber fluffer at 800 rpm.

S3, preparation of fluff pulp

Example 7:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

Under the condition of room temperature, adding an amino silane HD-M8252 serving as a bond-breaking agent into the basic slurry, adding a light calcium carbonate powder serving as a bulking agent, wherein the dosage of the amino silane HD-M8252 and the light calcium carbonate powder is 3% of that of the basic slurry, and obtaining the paper pulp after modification treatment in a standard fiber fluffer at 800 rpm.

S3, preparation of fluff pulp

Example 8:

s1, preparing basic slurry

wherein the mass concentration of the mixed fiber in the basic slurry is 2%, and the weight ratio of the white bamboo charcoal cotton fiber to the needle wood fiber is 1:0.45.

s2, modifying treatment of paper pulp

S3, preparation of fluff pulp

Example 9:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

S3, preparation of fluff pulp

Example 10:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

Under the condition of room temperature, adding an amino silane HD-M8373 serving as a bond-breaking agent into the basic slurry, wherein the dosage is 1% of that of the basic slurry, and obtaining the paper pulp after modification treatment in a standard defiberizer at 800 rpm.

S3, preparation of fluff pulp

Example 11:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

And adding a bulking agent of light calcium carbonate into the base slurry at room temperature, wherein the dosage of the bulking agent of light calcium carbonate is 1% of that of the base slurry, and obtaining the modified paper pulp in a standard defibering device at 800 rpm.

S3, preparation of fluff pulp

Example 12:

s1, preparing basic slurry

s2, modifying treatment of paper pulp

The pulp after the modification treatment was obtained in a standard defiberizer at 800rpm without adding any reagent at room temperature.

S3, preparation of fluff pulp

The fluff pulps prepared in examples 1 to 12 were subjected to performance tests, and the results are shown in Table 1.

TABLE 1 Performance parameters of fluff pulps prepared in examples 1-12

According to the experimental results, the bamboo fiber fluff pulp and the preparation method provided by the invention can be used for effectively improving the water absorption capacity and the water absorption speed of a single bamboo fiber after the bond-breaking agent and the bulking agent are added, solving the problem that the fiber strength of the single bamboo fiber is insufficient and the manufactured fiber tightness is high, and the manufactured fluff pulp reaches and exceeds the national standard and can be used as a material of high-end sanitary products.

In the above embodiment and its alternatives, the time for balancing moisture may also be 15h, 16h, 18h, etc., which is specifically determined according to the actual situation.

The specific embodiments described herein are offered by way of example only to illustrate the spirit of the invention. Various modifications or additions to the described embodiments may be made by those skilled in the art to which the invention pertains or may be substituted in a similar manner without departing from the spirit of the invention or beyond the scope of the appended claims.

While the invention has been described in detail and with reference to specific embodiments thereof, it will be apparent to one skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope thereof.

Claims

1. The preparation method of the bamboo fiber fluff pulp is characterized by comprising the following steps:

(1) Preparation of base slurry

(2) Modification treatment of pulp

(3) Preparation of fluff pulp

Making the paper pulp into fluff pulp paper board, performing hot pressing treatment to obtain a paddle board, placing the paddle board in a sealed bag to balance moisture, and performing mechanical dry dissociation to obtain fluff pulp;

in the step (1), the weight ratio of the bamboo fiber to the wood fiber is 1:0.25 to 0.66 percent, and the mass fraction of the fiber in the basic slurry is 2 to 3 percent;

the bond-breaking agent is at least one of aminosilane HD-M8252 and aminosilane HD-M8373;

the dosage of the bond-breaking agent is 1-3wt% of the basic sizing agent;

in the step (3), the hot pressing treatment includes:

2. The method of claim 1, wherein the bamboo fibers are one or a combination of a moso bamboo pulp fiber, a arrowhead bamboo pulp fiber, and a Bai Zhuzhu carbon fiber.

3. The method of claim 1, wherein the wood pulp fibers are one or more of needle wood fibers, masson pine fibers, larch fibers, red pine fibers, spruce fibers.

4. The method of claim 1, wherein the leavening agent is one or more of sodium bicarbonate, ammonium carbonate, calcium carbonate, sodium borohydride, sodium hydride.

5. The method of producing bamboo fiber fluff pulp of claim 1 or 4, wherein the amount of the leavening agent is 1 to 3wt% of the base slurry.

6. Bamboo fiber fluff pulp produced by the method of any of claims 1-5.

7. Use of the bamboo fiber fluff pulp according to claim 6 as a core of a hygiene article.