JP2007154386A - Non-wood rayon fiber and textile product using the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cloth from non-wood rayon, using non-wood pulp, having antibacterial property and further having tenseness and stiffness which the conventional rayon does not possess. <P>SOLUTION: The non-wood rayon fiber is obtained by dissolving non-wood pulp and fiberizing the obtained, wherein the non-wood pulp is prepared from a non-wood as the material to have an ash content of ≥0.11 wt.%. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a non-wood rayon fiber using pulp such as bamboo, hemp, kenaf, bagasse, moon peach and the like and a fiber product using the same.

  Non-wood rayon fibers made from non-wood pulp are partly used in fiber products as cellulose fibers made from bamboo pulp, but many of them have been used as paper materials until now. It has been rarely used to dissolve wood pulp into viscose and to use it as a fiber.

  The manufacturing process of dissolving pulp using wood as the raw material is a cooking process that removes most of the lignin and hemicellulose from the wood chips and pulps it, and removes the remaining lignin, hemicellulose, resin and ash to adjust the degree of polymerization of cellulose. It is roughly divided into purification and bleaching processes. In the latter refining and bleaching step, wood pulp used as a raw material for rayon fiber is defined as a resin content of 0.25% or less and an ash content of 0.1% or less in the standard of dissolved pulp of JIS P 2701. However, the non-wood pulp currently on the market is mainly used for papermaking and does not dissolve in viscose. Therefore, the degree of polymerization is higher than wood pulp and the ash content is very high. Is a feature.

  For this reason, it was difficult to use non-wood pulp as a rayon raw material like wood pulp as it is. In order to use non-wood pulp as a rayon raw material, it was necessary to adjust the degree of polymerization and remove ash in the refining bleaching step in the same manner as wood pulp. Pulp ash is removed in the digestion process, washing, and subsequent refinement bleaching process, but metal ions bound to cellulose must be removed by acid treatment using sulfurous acid or hydrochloric acid in the final process of refinement bleaching. Met.

  As described above, the ash content in the pulp has been removed as a harmful substance to produce viscose rayon. On the other hand, the ash content in the pulp has various special functions in which the obtained rayon fiber is derived from natural fibers. It is known that knitted fabrics and woven fabrics (textile products) obtained from non-wood rayon containing a large amount of ash have elasticity characteristics not found in ordinary rayon.

2. Description of the Related Art Conventionally, a method for producing a fiber product containing regenerated cellulose fiber using bamboo pulp as a raw material has been publicly known in order to obtain a firm fiber (for example, Patent Document 1).
JP 2001-115347 A

  However, in order to use non-wood pulp containing a large amount of ash as a raw material for rayon, it is necessary to cut commercialized non-wood pulp and react it with caustic soda to produce alkali cellulose. The contained non-wood pulp had a problem that the reaction with the caustic soda was very bad. Therefore, a very long time is required for the reaction with caustic soda, and considering the economy, production efficiency is low and practical application is difficult. On the other hand, the present inventors have confirmed that non-wood rayon exhibits good antibacterial performance under the influence of silicon dioxide, which is a component of ash contained therein. It is also known that dough obtained from non-wood rayon has a rich elasticity that is not found in ordinary rayon. Therefore, the present inventor intends to efficiently obtain a non-wood rayon fabric that has antibacterial properties and is rich in elasticity that is not found in ordinary rayon. .

  The method of Patent Document 1 for obtaining a regenerated cellulose fiber excellent in antibacterial and antifungal properties using bamboo pulp, which is a kind of non-wood pulp, as a raw material, is obtained by treating the obtained fiber with a surfactant solution afterwards. The polyphenol is prevented from leaching from the fiber, and the polyphenol is allowed to remain in an amount of 0.1 mg or more per 1 g of fiber. In this prior art, the ash content originally contained in the natural fiber is included. There is no disclosure of antibacterial fibers utilizing antibacterial performance.

  This invention is a non-wood rayon fiber obtained by dissolving non-wood pulp made from non-wood as a raw material and having an ash content of 0.11% by weight or more (Claim 1), wherein the non-wood pulp is bamboo, The non-wood rayon fiber according to claim 1 (claim 2), the non-wood rayon fiber according to claim 1 or 2, and a chemical fiber or natural fiber, which is any one of hemp, kenaf, bagasse, and moon peach A non-woven fabric obtained by mixing non-wood rayon fibers according to claim 1 and chemical fibers or natural fibers (claim 4).

  According to the present invention, since the non-wood rayon containing a large amount of ash is used, it is possible to obtain an elastic dough with a feeling of elasticity that is not found in ordinary rayon. Further, since a pulp raw material containing a large amount of ash is used, a fiber exhibiting antibacterial performance can be obtained. Furthermore, since the reactivity of the pulp with caustic soda is good, the productivity can be increased and an increase in manufacturing cost can be suppressed.

  Dissolved pulp is formed into sheet-like pulp by refining wood chips, but in order to use this as rayon fiber, ash content has been removed so far due to effects on fiber strength, aging process, dyeing, etc. Is going. The removal of ash here is performed by acid treatment using sulfuric acid or hydrochloric acid performed in the final step, in addition to the pulp cooking step, washing, refining bleaching step and the like. On the other hand, non-wood pulp which is often used as a pulp for papermaking without being fiberized remains without removing ash. The inventor researched the ash contained in the non-wood pulp, and found that the naturally-derived ash has excellent antibacterial properties.

  That is, when various non-wood pulps and rayon fibers using the same were measured, silicon dioxide was detected from all of them. Silicon dioxide is conventionally known as an inorganic metal salt as an antibacterial and deodorizing and antibacterial finishing agent for textile products, and it is considered that antibacterial performance is expressed by this substance.

  However, when the degree of polymerization of cellulose in the non-wood pulp is measured, the degree of polymerization is higher than that of cellulose in the wood pulp, and when it contains a large amount of ash, it is cut and reacted with caustic soda. There was a problem that the reactivity was poor, and it took a long time to immerse the cut pulp in caustic soda to make alkali cellulose, resulting in very poor productivity. Accordingly, in the present invention, it was found that by reacting with a surfactant in the process of alkali cellulose by immersing in non-wood pulp caustic soda, the reactivity with caustic soda is greatly promoted and the productivity is greatly improved. It is. As other treatments except the surfactant treatment, viscose is obtained by performing the same treatment as in the case of ordinary wood pulp.

  That is, non-wood pulp is used and is immersed in caustic soda in the same manner as usual to obtain alkali cellulose. In this case, in the present invention, the surfactant treatment is performed. This surfactant is added simultaneously when the pulp is immersed in caustic soda. The addition amount is 2 to 10%, preferably 3 to 5%, based on the weight of pulp. If the addition amount of the surfactant is less than 2% by weight, there is no effect, and if it exceeds 10% by weight, there is no further effect and the cost is increased. As the surfactant, an anionic surfactant, a cationic surfactant, a nonionic surfactant and the like can be used, and a cationic surfactant is preferable. Then, it is squeezed to remove excess caustic soda and aged.

  Non-wood pulp has higher ash content than wood pulp, and it takes longer time to react with caustic soda than wood pulp, and it has been considered that the temperature of caustic soda solution can be raised to solve this problem. However, there is a limit to this, and when the limit is exceeded, cellulose molecules are not decomposed. On the other hand, when the surfactant treatment performed in the present invention is performed, the reactivity between pulp and caustic soda can be greatly improved without particularly increasing the treatment liquid temperature, and alkali cellulose can be easily obtained in a short time. It has become possible.

  Thereafter, this is reacted with carbon disulfide to obtain cellulose xanthate soda, which is dissolved in dilute caustic soda solution to obtain viscose. Subsequently, the viscose is filtered, defoamed and aged, extruded from the nozzle into the coagulation liquid, and spun. These are the same as for viscose ordinary rayon. In the present invention, polynosic fibers can also be applied. Alternatively, non-wood rayon viscose and wood rayon viscose may be mixed to form rayon fibers.

Experimental example 1
A viscose dissolution test was conducted using 1 kg of bamboo pulp (manufactured by Bamboo Pulp PHOENIX-TH) and 1 kg of wood pulp (manufactured by Nippon Chemical Co., Ltd., LDP-T) as raw materials.

[Test condition 1] (Bamboo pulp and wood pulp)
Bamboo pulp and wood pulp were separately cut into sizes that could fit into a slurry tank, and then viscose was obtained under normal rayon production conditions. All of the slurry processes were immersed in a 220 g / l aqueous caustic soda solution of pulp and performed at 50 ° C./15 minutes. In each of the sulfiding steps, the carbon disulfide addition amount was 30% by weight with respect to the pulp, and the sulfiding step was performed for 75 minutes. Both dissolution processes produced viscose with a dissolution time of 120 minutes. The results are shown in Table 1. As shown in Table 1, wood pulp obtained good viscose, but bamboo pulp did not obtain good viscose. In Table 1, the viscose KW value is a value obtained by the following formula and indicating the filterability of viscose. The smaller this value, the better the filterability.

KW value = (2-P2 / P1) / (P1 + P2) × 10 ⁵ (1)
However, P1 is a 20-minute viscose filtration rate, and P2 is a 20- to 60-minute viscose filtration rate.

[Test condition 2] (Bamboo pulp)
Bamboo pulp was cut into strips of 5 cm × 10 cm, and viscose was obtained under normal rayon production conditions. The slurry process was immersed in a 220 g / l aqueous caustic soda solution of pulp, immersed at 20 ° C./20 hours, and then stirred at 50 ° C. for 60 minutes. The sulfurization step was performed for 120 minutes with the carbon disulfide addition amount being 40% by weight with respect to the pulp. The dissolution process was the same as in test condition 1. The results are shown in Table 1. As shown in Table 1, the immersion time in caustic soda was as long as 20 hours, and practical use was impossible.

[Test condition 3] (Bamboo pulp)
Bamboo pulp was cut into strips of 5 cm × 10 cm, and viscose was obtained under normal rayon production conditions. The slurry step was immersed in a 220 g / l aqueous solution of caustic soda, immersed in 60 ° C./5 hours and stirred. The sulfurization step and the dissolution step were performed in the same manner as in test condition 2. The results are shown in Table 1. As shown in Table 1, in this case as well, a good viscose having a low viscose KW value was obtained. In this case, however, the reaction with the caustic soda solution requires a long time of 5 hours. Was difficult.

Experimental example 2
A viscose dissolution test was performed using 1 kg of Manila hemp pulp (ABACA PULP), 1 kg of bamboo pulp (manufactured by Bamboo Pulp PHOENIX-TH), and 1 kg of wood pulp (manufactured by Nippon Chemical Co., Ltd., LDP-T).

(Test conditions)
[Test condition 4] (Manila hemp pulp)
Manila hemp pulp was cut into strips of 5 cm × 10 cm, and viscose was obtained in the same manner as ordinary rayon. The slurry process was immersed in an aqueous 220 g / l caustic soda solution of pulp, immersed in 20 ° C./16 hours, and further stirred at 50 ° C. × 60 minutes. The sulfurization step was performed for 120 minutes with the carbon disulfide addition amount being 40% by weight with respect to the pulp. The dissolution process was the same as the test condition 1 of Experimental Example 1. The results are shown in test condition 4 in Table 2. As shown in Table 2, in this case, a good viscose was obtained, but the immersion time in caustic soda was as long as 16 hours, so that it could not be put into practical use.

[Test condition 5] (Manila hemp pulp)
Manila hemp pulp was cut into strips of 5 cm × 10 cm, and viscose was obtained in the same manner as ordinary rayon. The slurry process was immersed in an aqueous 220 g / l caustic soda solution of pulp and immersed at a temperature of 60 ° C. for 5 hours. The sulfurization step was performed for 120 minutes with the carbon disulfide addition amount being 40% by weight with respect to the pulp. The dissolution process was the same as the test condition 4. The results are shown in test condition 5 in Table 2. In this case, a good viscose can be obtained, but the immersion time in caustic soda is still as long as 5 hours, making it difficult to put it to practical use.

[Test condition 6] (Manila hemp pulp)
Manila hemp pulp was cut into 5 cm × 10 cm strips. In the slurry process, the pulp was immersed in a 220 g / l aqueous solution of caustic soda, and a surfactant (“Neuron 1225-D”, Takemoto Yushi Co., Ltd.) was added at 3% by weight to the pulp. This was stirred at 60 ° C. for 3 hours and at 60 ° C. for 1 hour. The sulfiding conditions were the same as the test condition 4. The results are shown in test condition 6 of Table 2. In this case, good viscose was obtained.

Experimental example 3
Five types of viscose were produced from the raw materials of 20 kg each of five types of non-wood pulp under the pulp, slurry, and sulfidizing conditions used in Experimental Example 1 and Experimental Example 2, and fiberized by spinning. The spinning conditions were a spinning speed of 45 m / min and a drawing rate of 60%. The fiber performance was as shown in Table 3. The table also shows normal rayon.

  As shown in Table 3, it can be seen that the ash content of non-wood rayon is significantly higher than that of ordinary rayon.

Experimental Example 4
Table 4 shows the results of the antibacterial test of the fiber obtained in Experimental Example 3. The test method was the JIS 1902 bacterial solution absorption method, and the test bacteria were Staphylococcus aureus.

  As shown in Table 4, it can be seen that all of the non-wood rayon exhibits excellent antibacterial properties.

Experimental Example 5
The non-wood pulp used for the fiber and raw material obtained in Experimental Example 3 was quantitatively analyzed for silicon dioxide by ICP-emission spectroscopic analysis. The results are shown in Table 5. The antibacterial performance of silicon dioxide has already been recognized.

  As shown in Table 5, it can be seen that non-wood rayon contains a larger amount of silicon dioxide having antibacterial action than ordinary rayon.

Experimental Example 6
Of the fibers obtained in Experimental Example 3, four types of non-wood rayon 1.7T × 38mm and ordinary rayon 1.7T × 38mm were spun to obtain 40% 100% yarn under the condition of a twisting factor of 24 times / inch. . The yarn was passed through a circular double cylinder knitting machine to prepare a tentacle knit, and this was dyed to obtain a sample fabric. Using this fabric, the weight per unit area was measured, and then a tensile test, a bending test, a compression test, and a surface test were performed by KES-FB auto equipment to conduct a texture investigation. The results are shown in Table 6.

  The results shown in Table 6 will be described as follows.

1. Tensile test (Elongation item in Table 6)
The elongation EMT when the dough is pulled is lower in the bamboo rayon and the burlap rayon than in the ordinary rayon, and the elongation of the Manila hemp rayon is almost the same as that in the ordinary rayon, but the weight per unit area of the dough is lower than that in the ordinary rayon. Therefore, if this is the same weight, it is considered that the elongation is rather high. As a result, the fabrics of bamboo rayon, burlap rayon, and Manila hemp rayon are less stretchable than normal rayon, and can be said to be firm.

2. Bending test (Bending stiffness in Table 6)
The high rigidity when the dough is bent can be said to be an elastic and stiff dough. Bamboo rayon and kenafreyon fabric wales have a higher bending rigidity and a slightly stiffer fabric than ordinary rayon. Manila hemp and burlap rayon fabric wales were at the same level as ordinary rayon, but considering the weight per unit area, they can be said to be more rigid than ordinary rayon.

3. Bending test (term of hysteresis width in Table 6)
The bending moment when the radius of curvature of the bent portion of the fabric is made constant is measured, and the difference in bending moment between bending and returning is expressed by the width of the hysteresis. The smaller the width of the hysteresis is, the more it has an ability to return to the original state, and it can be said that the fabric is elastic and stiff.

  Bamboo rayon, Manila hemp rayon, and burlap rayon fabrics have a lower hysteresis width than normal rayon fabrics for both wales and courses.

4). Compression test (compression resilience section in Table 6)
The resilience RC (%), which indicates the behavior when the dough is compressed, is expressed as the ratio of the amount of work during compression to the amount of work when returning to the original state. The larger the value, the higher the resilience and the greater the feeling of swelling. It can be said that there is a fabric with. That is, it is obtained by the following formula.

RC (%) = Work amount when returning / Work amount when compressing × 100
Bamboo rayon, Manila hemp rayon, and burlap rayon fabric have a higher RC (%) value than ordinary rayon fabric, and it is understood that the fabric is highly elastic and swelled.

5. Compression test (Friction coefficient, friction standard deviation in Table 6)
Regarding the coefficient of friction, the friction coefficient of bamboo rayon is low and the fabric tends to be slippery, but Kenaflayon has a slimy feeling and other fabrics are not so different. Moreover, the average deviation of the coefficient of friction does not show a difference except for Kena Freyon. The deviation in the course direction of the Kena frayon fabric is a large value, which is thought to be due to the difference in the knitting structure.

Table 7 shows the relationship between the texture and the texture of the above results.

  As shown in Table 7, the dough using the non-wood rayon has elasticity and abundantness that is rich in elasticity that is not found in the dough using ordinary rayon.

Example 1
Bamboo pulp (manufactured by Bamboo Pulp PHOENIX-TH) 1 kg cut into 5 cm × 10 cm strips was immersed in a 200 g / l aqueous sodium hydroxide solution to prepare a slurry. Further, a solution obtained by dissolving 5% by weight of a surfactant (Takemoto Oil & Fats Neuron 1225-D, active ingredient 40%) with respect to pulp in caustic soda was added to the slurry and stirred at 60 ° C. for 2 hours. Thereafter, the slurry liquid was squeezed and then pulverized to obtain alkali cellulose. This was aged and sulfurized at a carbon disulfide addition amount of 40% by weight of pulp × 120 minutes, and a diluted alkali was added and treated for 120 minutes. As a result, viscose as shown in Table 8 was obtained.

  Viscose was prepared from 20 kg of bamboo pulp (manufactured by Bamboo Pulp PHOENIX-TH) under the above-mentioned pulp, slurry, sulfurization conditions, and dissolution conditions, and this was spun into fibers. The spinning conditions were spinning speed of 45 m / min, stretching rate of 60%, cutting, scouring and drying to obtain bamboo rayon.

This bamboo rayon 1.7T × 38 mm was spun to obtain 40% 100% yarn under the condition of a twisting factor of 24 times / inch. In order to investigate the characteristics of the non-wood rayon material, a tentacle knit was produced on a circular double cylinder knitting machine using only 100% yarn, and further dyed to obtain a bamboo rayon fabric. When the obtained bamboo rayon fabric was subjected to an antibacterial test, as shown in Table 9, strong antibacterial properties were confirmed.

(Example 2)
Alkali cellulose was obtained in the same manner as in Example 1 using Manila hemp pulp (ABACA Pulp). Using this, the same treatment as in Example 1 was performed, and viscose as shown in Table 10 was obtained.

  Further, viscose was produced using 20 kg of hemp pulp (ABACA Pulp) under the above-mentioned pulp, slurry, sulfurization conditions and dissolution conditions, and this was spun into fibers. Spinning speed, drawing rate, cutting, refining, drying, etc. were carried out under the same conditions as in Example 1 to obtain Manila hemp rayon.

Using this Manila hemp rayon, a tengu knit was prepared in the same manner as in Example 1 and further dyed to obtain a Manila hemp rayon fabric. When the antibacterial test of the resulting Manila hemp rayon fabric was performed, strong antibacterial properties were confirmed as shown in Table 11.

(Example 3)
Alkali cellulose was obtained in the same manner as in Example 1 by using 1 kg of Kenaf Pulp cut into 5 cm × 10 cm strips. Using this, viscose as shown in Table 12 was obtained in the same manner as in Example 1.

  Further, viscose was produced in the same manner as described above using 20 kg of kenaf pulp, and this was spun into fibers. Furthermore, Kena frayon was obtained in the same spinning conditions as in Example 1.

Using this kenaf rayon, a tengu knit was prepared in the same manner as in Example 1, and further dyed to obtain a Manila hemp rayon. When the antibacterial test of the resulting Manila hemp rayon fabric was conducted, strong antibacterial properties were confirmed as shown in Table 13.

Claims (4)

  Non-wood rayon fiber obtained by dissolving non-wood pulp with non-wood as a raw material and having an ash content of 0.11% by weight or more.   The non-wood rayon fiber according to claim 1, wherein the non-wood pulp is any one of bamboo, hemp, kenaf, bagasse, and moon peach.   A fiber product obtained by mixing the non-wood rayon fiber according to claim 1 or 2 with a chemical fiber or a natural fiber.   A non-woven fabric obtained by mixing the non-wood rayon fiber according to claim 1 or 2 with a chemical fiber or a natural fiber.