JP4222023B2 - Woven knitting for bedding materials - Google Patents

Description

【００７２】
【表２】

【００７３】
（表中、「Ｕ％」とは「Ｕ％ Ｎｏｒｍａｌ値」、「ＷＣＦ」とは「経糸のカバーファクター」、「ＦＣＦ］とは「緯糸のカバーファクター」、「ＷＣＦ／ＦＣＦ」とは「経糸のカバーファクター／緯糸のカバーファクター」である。）
【００７４】
【発明の効果】
本発明によれば、耐摩耗性に優れ、柔軟かつ肌に優しいポリ乳酸繊維からなる寝装資材用織編物が得られる。本発明の耐摩耗性に優れた寝装資材用織編物を用いることにより、実用耐久性に優れ、かつ柔軟で肌に優しい寝装資材を製造することができる。
【図面の簡単な説明】
【図１】 本発明で好ましく用いられる紡糸装置を示す概略図である。
【符号の説明】
１：ホッパー
２：エクストルーダー
３：紡糸ブロック
４：紡糸パック
５：紡糸口金
６：吸引装置
７：冷却チムニー
８：給油装置
９：交絡ノズル
１０：第１ゴデットロール
１１：第２ゴデットロール
１２：巻取装置
１３：チーズ状パッケージ[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a woven or knitted fabric for bedding materials having excellent wear resistance and flexibility.
[0002]
[Prior art]
Recently, with increasing awareness of the environment on a global scale, the development of fiber materials that decompose in the natural environment is eagerly desired. For example, conventional general-purpose plastics use petroleum resources as the main raw material, so they will not decompose in the natural environment, and future depletion of petroleum resources and global warming caused by mass consumption of petroleum resources are major problems. It has been picked up.
[0003]
For this reason, in recent years, research and development of various plastics and fibers such as aliphatic polyesters have been activated. Among them, attention is focused on plastics that are decomposed by microorganisms, that is, fibers using biodegradable plastics.
[0004]
Moreover, by using plant resources that grow by taking in carbon dioxide from the atmosphere, it can be expected that global warming can be suppressed by the circulation of carbon dioxide, and the problem of resource depletion may be solved. Therefore, attention has been focused on plastics starting from plant resources, that is, plastics using biomass.
[0005]
Until now, biodegradable plastics using biomass have not been used as general-purpose plastics due to their low mechanical properties and heat resistance, as well as high manufacturing costs. On the other hand, in recent years, polylactic acid using lactic acid obtained by fermentation of starch as a raw material has attracted attention as a biodegradable plastic having relatively high mechanical properties and heat resistance and low production cost.
[0006]
Polylactic acid has been used in the medical field for a long time as, for example, a surgical suture, but recently it has become competitive with other general-purpose plastics in terms of price due to improvements in mass production technology. For this reason, product development as a fiber has been activated.
[0007]
The development of polylactic acid fiber is preceded by agricultural materials and civil engineering materials that make use of biodegradability, but as a large-scale application that follows, it is a material that is gentle on the skin that makes use of the mildly acidic and mild antibacterial properties of polylactic acid. And is also expected to be applied to interior applications such as clothing, curtains and carpets.
[0008]
However, the polylactic acid fiber has a high surface friction coefficient and low wear resistance, and thus has a disadvantage that it can be easily scraped by rubbing. Therefore, when polylactic acid fiber is used as a bedding material, the fiber surface is shaved due to long-term use and the texture is lowered, or a color defect called white blur becomes obvious due to irregular reflection on the surface. When it is severe, there is a problem that the dye is transferred from the bedding to the pajamas. For this reason, development for bedding materials has not yet progressed.
[0009]
The cause causing these problems is due to the substrate of the polylactic acid polymer, and it is considered that the problem naturally occurs in the polylactic acid fiber.
[0010]
By the way, in the field of resin products, films, sheets, etc., in the manufacturing process, a lubricant is added to the polymer in order to improve the anti-blocking property of chips and molten polymer or the peelability of the molded product from the mold or roller. There is a case. However, in the field of fibers, the heat resistance of lubricants and the bleed-out to the fiber surface due to sublimation cause deterioration of fiber properties and quality deterioration due to dyeing spots, so it is unavoidable to use such additives until now. It was in.
[0011]
For a polylactic acid molded body to which a lubricant is added, for example, a compound comprising an aliphatic carboxylic acid amide, an aliphatic carboxylate, an aliphatic alcohol and an aliphatic carboxylic acid is used as a crystal nucleating agent, and a highly transparent molded body is obtained. A method of obtaining is disclosed (see Patent Document 1). However, this method does not specifically describe polylactic acid fibers, and does not suggest any improvement in wear resistance. For polylactic acid fibers with added lubricant, the general formula RCONH₂It is disclosed that a hydrolysis rate is suppressed by adding a fatty acid monoamide represented by (where R is an alkyl group) and imparting water repellency (see Patent Document 2). However, there is no suggestion of improving the abrasion resistance of polylactic acid fibers. In addition, as a precaution, a polylactic acid fiber to which a fatty acid monoamide was added was tested, but the wear resistance of the polylactic acid fiber could not be improved (see Comparative Example 2). This is presumably because the fatty acid monoamide reacts with polylactic acid at the time of melting due to the high reactivity of the amide group, and the proportion of fatty acid monoamide that contributes as a lubricant decreases. In addition, when fatty acid monoamide reacts with polylactic acid, the molecular chain of polylactic acid is cleaved, resulting in a decrease in molecular weight.
[0012]
In order to advance the development of bedding materials, it is desired to solve such problems.
[0013]
[Patent Document 1]
JP-A-9-278991 (pages 2 to 3)
[0014]
[Patent Document 2]
JP-A-8-183898 (pages 2 and 3)
[0015]
[Problems to be solved by the invention]
An object of the present invention is to provide a woven or knitted fabric for bedding material, which is made of polylactic acid fiber which is excellent in wear resistance, flexible and gentle to the skin.
[0016]
[Means for Solving the Problems]
  The above problem is that "fatty acid bisamide and / or alkyl-substituted fatty acid monoamide is applied to the whole fiber.0.1A multifilament made of polylactic acid containing ˜5% by weight and having a single fiber fineness of 0.1 to 2.4 dtex is used.B which is an indicator of color tone * The value is −1 to 5Achieved by “woven / knitted bedding material”.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the woven or knitted fabric for bedding material of the present invention will be described in detail.
[0018]
The polylactic acid referred to in the present invention is-(O-CHCH_ThreeA polymer having -CO) n- as a repeating unit, which is obtained by polymerizing lactic acid oligomers such as lactic acid and lactide. Since lactic acid has two types of optical isomers, D-lactic acid and L-lactic acid, the polymer is poly (D-lactic acid) consisting only of D isomer and poly (L-lactic acid) consisting only of L isomer, and There is polylactic acid consisting of both. As the optical purity of D-lactic acid or L-lactic acid in polylactic acid decreases, the crystallinity decreases and the melting point drop increases. Therefore, the optical purity is preferably 90% or more in order to improve heat resistance.
[0019]
However, apart from the system in which two types of optical isomers are simply mixed as described above, the two types of optical isomers are blended and formed into a fiber, and then subjected to a high temperature heat treatment at 140 ° C. or higher. A stereo complex in which a racemic crystal is formed is more preferable because the melting point can be dramatically increased.
[0020]
In addition, residual monomers such as lactide are present in polylactic acid, but these low molecular weight residues are the cause of abnormal dyeing such as heating-heater stains in the false twisting process and dyed spots in the dyeing process. Become. Further, in order to promote hydrolyzability of the fiber and reduce durability, these low molecular weight residues are preferably 1% by weight or less, more preferably 0.5% by weight or less, and further preferably 0.2% by weight. It is as follows.
[0021]
In addition, components other than lactic acid may be copolymerized within a range that does not impair the properties of polylactic acid. The components to be copolymerized include polyethers such as polyethylene glycol, aliphatic polyesters such as polybutylene succinate and polyglycolic acid, aromatic polyesters such as polyethylene isophthalate, and hydroxycarboxylic acids, lactones, dicarboxylic acids and diols. Examples thereof include an ester bond-forming monomer. However, from the viewpoint of biomass utilization and biodegradability, the lactic acid monomer ratio in the polylactic acid fiber needs to be 50% by weight or more. The lactic acid monomer is preferably 75% by weight or more, more preferably 96% by weight or more. Further, a thermoplastic polymer other than polylactic acid may be blended, or both components may be combined (core-sheath type, bimetal type). Furthermore, additives such as particles, flame retardants, antistatic agents, antioxidants and ultraviolet absorbers may be contained as modifiers. Further, the molecular weight of the polylactic acid polymer is preferably 50,000 to 350,000 in terms of weight average molecular weight, and a good balance between mechanical properties and moldability is preferred, and more preferably 100,000 to 250,000.
[0022]
The method for producing the polylactic acid of the present invention is not particularly limited. Specifically, the method disclosed in JP-A-6-65360 is exemplified. That is, a direct dehydration condensation method in which lactic acid is dehydrated and condensed as it is in the presence of an organic solvent and a catalyst. Further, it is a method of copolymerizing and transesterifying at least two kinds of homopolymers disclosed in JP-A-7-173266 in the presence of a polymerization catalyst. Furthermore, there is a method disclosed in US Pat. No. 2,703,316. That is, an indirect polymerization method in which lactic acid is once dehydrated to form a cyclic dimer and then subjected to ring-opening polymerization.
[0023]
  In the present invention, fatty acid bisamide and / or alkyl-substituted fatty acid monoamide is used as a lubricant for the entire fiber.0.1Contains ~ 5% by weight.
[0024]
A multifilament made of polylactic acid has extremely poor wear resistance as compared with general-purpose synthetic fibers such as polyethylene terephthalate and polyamide. This is considered to be because the interaction between the molecular chains of polylactic acid is small and the molecular chains are easily peeled off. This tendency becomes more prominent as the temperature becomes higher. For this reason, if the yarn is run at a high speed in the yarn making process or the weaving and weaving process, the fiber is easily scraped to cause fluff and yarn breakage, and in severe cases, fusion occurs. In addition, if the product is repeatedly used or applied with a strong frictional force even after becoming a product such as clothing, the surface becomes rough due to wear, resulting in abnormal color tone, or it may cause rough skin if the texture is severe. In order to solve such a problem, the surface friction coefficient of the fiber is reduced by the addition of a lubricant, so that it is possible to suppress an excessive increase in temperature or to prevent stress from being applied until breakage occurs.
[0025]
Examples of the lubricant preferably used for the multifilament made of polylactic acid used in the present invention include fatty acid bisamide and / or alkyl-substituted fatty acid monoamide.
[0026]
The fatty acid bisamide used in the present invention refers to a compound having two amide bonds in one molecule such as saturated fatty acid bisamide, unsaturated fatty acid bisamide, aromatic bisamide, etc., for example, methylene biscaprylic amide, methylene biscaprin Acid amide, methylene bis lauric acid amide, methylene bis myristic acid amide, methylene bis palmitic acid amide, methylene bis stearic acid amide, methylene bis isostearic acid amide, methylene bis behenic acid amide, methylene bis oleic acid amide, methylene bis eruka Acid amide, ethylene biscaprylic acid amide, ethylene biscapric acid amide, ethylene bislauric acid amide, ethylene bismyristic acid amide, ethylene bispalmitic acid amide, ethylene bisstearic acid amide, ethyl Bisisostearic acid amide, ethylene bis behenic acid amide, ethylene bis oleic acid amide, ethylene bis erucic acid amide, butylene bis stearic acid amide, butylene bis behenic acid amide, butylene bis oleic acid amide, butylene bis erucic acid Amide, hexamethylene bis stearic acid amide, hexamethylene bis behenic acid amide, hexamethylene bis oleic acid amide, hexamethylene bis erucic acid amide, m-xylylene bis stearic acid amide, m-xylylene bis-12-hydroxy stearic acid Amide, p-xylylene bis-stearic acid amide, p-phenylene bis-stearic acid amide, p-phenylene bis-stearic acid amide, N, N′-distearyl adipic acid amide, N, N′-distearyl sebacic acid amide N, N'-dioleyl adipic acid amide, N, N'-dioleyl sebacic acid amide, N, N'-distearyl isophthalic acid amide, N, N'-distearyl terephthalic acid amide, methylenebishydroxystearin And acid amide, ethylene bishydroxystearic acid amide, butylene bishydroxystearic acid amide, and hexamethylene bishydroxystearic acid amide.
[0027]
The alkyl-substituted fatty acid monoamide used in the present invention refers to a compound having a structure in which an amide hydrogen such as a saturated fatty acid monoamide or an unsaturated fatty acid monoamide is replaced with an alkyl group, such as N-lauryl lauric acid amide, N -Palmityl palmitic acid amide, N-stearyl stearic acid amide, N-behenyl behenic acid amide, N-oleyl oleic acid amide, N-stearyl oleic acid amide, N-oleyl stearic acid amide, N-stearyl erucic acid amide and N- Examples include oleyl palmitic acid amide. The alkyl group may have a substituent such as a hydroxyl group introduced into its structure. For example, methylol stearamide, methylol behenic acid amide, N-stearyl-12-hydroxystearic acid amide and N- Oleyl 12 hydroxystearic acid amide and the like are also included in the alkyl-substituted fatty acid monoamide of the present invention.
[0028]
In the present invention, fatty acid bisamides and alkyl-substituted fatty acid monoamides are used, but these compounds are less reactive with amides than general fatty acid monoamides, so that reaction with polylactic acid hardly occurs during melt molding. Furthermore, since many of them have a high molecular weight, they have high heat resistance and are difficult to sublimate by melt molding, so that they exhibit excellent slipperiness without impairing the function as a lubricant. In particular, fatty acid bisamide can be used more preferably because the reactivity of the amide is lower, and ethylene bis stearamide is a more preferred embodiment.
[0029]
In the present invention, two or more fatty acid bisamides and an alkyl-substituted fatty acid monoamide may be used, or a fatty acid bisamide and an alkyl-substituted fatty acid monoamide may be used in combination.
[0030]
For example, in fatty acid bisamide, ethylene oil stearic acid amide trade name “Alflow” H series manufactured by Nippon Oil & Fats Co., Ltd., m-xylylene bis stearic acid amide trade name “Sripacs PXS” manufactured by Nippon Kasei Co., Ltd., Examples of the alkyl-substituted fatty acid monoamide include N-stearyl stearamide trade name “Nikka Amide S” manufactured by Nippon Kasei Co., Ltd.
[0031]
  The content of the fatty acid bisamide and / or the alkyl-substituted fatty acid monoamide is based on the fiber weight in order to exhibit the above characteristics.0.1It is necessary to make it 5 wt%. In order to express slipperiness, the content should be 0.1% by weight or more.is necessary. In addition, if the content is too large, the mechanical properties of the fiber deteriorates or the color tone deteriorates when dyed with yellowishness, so the content must be 5% by weight or less. The content of the alkyl-substituted fatty acid monoamide is more preferably 0.2 to 4% by weight, still more preferably 0.3 to 3% by weight.
[0032]
In order to achieve both flexibility and wear resistance, which are the objects of the present invention, the fineness of the single fibers constituting the multifilament needs to be 0.1 to 2.4 dtex. By setting the single fiber fineness to 0.1 to 2.4 dtex, it is possible to impart the intended flexibility and wear resistance, as well as good color development. When the single fiber fineness is less than 0.1 dtex, the flexibility is improved, but the wear resistance tends to be lowered. In the present invention, although the wear resistance is improved by the friction reducing effect by the lubricant, the effect is small when the single fiber fineness is less than 0.1 dtex, and the color developability is also lowered at the same time. On the contrary, if the single fiber fineness exceeds 2.4 dtex, the wear resistance and color developability are improved, but the flexibility is lowered. A preferable range of the single fiber fineness is 0.2 to 1.2 dtex, and a more preferable range is 0.3 to 0.8 dtex. Further, the total fineness of the multifilament is preferably 30 to 120 dtex, more preferably 40 to 90 dtex in order to impart flexibility as a woven or knitted fabric while maintaining practical durability.
[0033]
Further, the cross-sectional shape of the single fiber constituting the multifilament may be any of a round cross section, a triangular cross section, a multi-lobe cross section, a hollow cross section, a flat cross section, a W cross section, an X-shaped cross section, and other irregular cross sections.
[0034]
The multifilament of the present invention is preferably subjected to bulk processing in order to make the texture of the woven or knitted fabric more flexible and suppress puckering of the woven or knitted fabric. For example, false twisting or fluid treatment (taslan) is preferably performed, and taslan processing is more preferable. As a result, innumerable loops and coils can be formed on the surface of the fabric, so that flexibility and drapeability are improved and a spun-like surface feeling is obtained.
[0035]
Further, the preferred weaving structure and knitting structure for use as a bedding material are not particularly limited, but plain weave, twill weave, satin weave, or a combination or combination of these, tricot, towel fabric, velour, There are knitted fabrics such as Furano and brushed fabrics. However, when used as a futon side fabric, a plain weave structure is optimal because it is necessary to prevent cotton slippage. Further, it is preferable that the warp cover factor (WCF) and the weft cover factor (FCF) satisfy the following expressions.
[0036]
0.60 ≦ FCF / WCF ≦ 0.80
For example, in order to use the fabric for bedding material of the present invention as a futon side, as described above, since it becomes an essential property to prevent cotton slipping, weaving moderately at a high density, further shrinking the warp in the weaving process, A method for improving the latitude density is preferably employed. In the plain weave structure, the bending of the weaving yarn (weft) is particularly large among the weaving structures, and it is difficult to create a gap in the fabric. Further, by setting the weaving density ratio FCF / WCF in the range of 0.60 to 0.80, it is possible to effectively prevent loosening. On the other hand, if it is out of this range, it tends to cause loosening and rough hardening of the texture.
[0037]
For example, if the FCF / WCF is less than 0.60, it is difficult to increase the density of the woven fabric, and it is necessary to make the cover factor of the warp very high in order to prevent the cotton loss. In such a case, the weft tear strength may be reduced and may not reach a practical level. Similarly, when the FCF / WCF exceeds 0.80, it is difficult to increase the density, and when the density is increased excessively, the texture may be hardened.
[0038]
  In addition, the color tone of the woven or knitted fabric before dyeing has a b * value that is one index (yellowishness) of the color tone in order to increase color variations at the dyeing stage in the subsequent process and enable a highly saturated color. -1 to 5Is necessary-1 to 3PreferGood. In addition, when the polylactic acid fiber containing the fatty acid monoamide which is a prior art is used, the b * value tends to be high and yellowing tends to be strong. This is presumably because, in addition to thermal degradation of the fatty acid monoamide, the fatty acid monoamide reacts with the carbonyl group of the polylactic acid polymer during melt molding to form a diacetamide group. On the other hand, fatty acid bisamides and alkyl-substituted fatty acid monoamides used in the present invention are excellent in heat resistance and have low reactivity of amide groups, so that the fibers are not easily colored.
[0039]
The knitted or knitted fabric for bedding material of the present invention may contain other fibers if, for example, if it is a woven fabric, either warp or weft is a multifilament made of polylactic acid. For example, a multifilament made of polylactic acid may be aligned with natural fiber, regenerated fiber, semi-synthetic fiber or synthetic fiber, twisted yarn, or mixed fiber. Other fibers include natural fibers such as cotton, hemp, wool, and silk, regenerated fibers such as rayon and cupra, semi-synthetic fibers such as acetate, nylon, polyester (polyethylene terephthalate, polybutylene terephthalate, etc.), polyacrylonitrile, Synthetic fibers such as polyvinyl chloride can be applied.
[0040]
Moreover, an antistatic agent and a hygroscopic agent can be provided as needed. In addition, when weaving, multi-filaments made of polylactic acid may be appropriately twisted for the purpose of bundling, bending rigidity, texture, etc., and glued for bundling. May be.
[0041]
The woven or knitted fabric for bedding material of the present invention is a woven or knitted fabric used for bedding materials, and as bedding materials, comforters and mattresses, skin comforters, kotatsu comforters, cushions, baby comforters, blankets, etc., pillows, Examples include side covers such as cushions, mattresses and bed pads, hospital sheets, medical sheets, hotel sheets, baby sheets, and covers such as sleeping bags, cradle and baby strollers. As contents filled in these futons, cotton, wool, silk, polyester, acrylic, urethane foam, beads, pipes, buckwheat husks and the like are preferably used.
[0042]
The woven or knitted fabric for bedding material according to the present invention exhibits sufficient practical durability, good flexibility and color developability when used as these materials, and also has excellent comfort due to the weakly acidic and antibacterial effects of polylactic acid. Is obtained.
[0043]
【Example】
Hereinafter, the knitted fabric for bedding material of the present invention will be described in detail with reference to examples. In addition, the following methods were used for the measurement and evaluation methods of physical properties and the like in the examples.
[0044]
A. Weight average molecular weight
Gel permeation chromatography 2690 manufactured by Waters was used, and measurement was performed using polystyrene as a standard.
[0045]
B. Strength and elongation
The sample was measured by Tensilen (TENSILON) UCT-100 manufactured by Orientec Co., Ltd. under the constant speed elongation conditions shown in JISL1013 (chemical fiber filament yarn test method). The elongation at break was determined from the elongation at the point showing the maximum strength in the SS curve.
[0046]
C. Yarn spots U%
Thickness unevenness U% (Normal) in the longitudinal direction of the yarn was measured with a Worcester tester monitor C (USTER TESTER MONITOR C) manufactured by Zerbegger Worcester. The condition was that the yarn speed was supplied at 200 m / min for 1 minute, and the average deviation rate (U%) was measured in the normal mode.
[0047]
D. Boiling water shrinkage
It measured according to JIS L 1013 (chemical fiber filament yarn test method). Use a measuring machine to collect sachets from the undrawn yarn package, 90 x 10^-3Measure the casket length L1 with the actual length measurement load of cN / dtex, then remove the actual length measurement load, put it in boiling water for 15 minutes, take it out, air-dry, and again apply the actual length measurement load to the casket length. L2 was measured and the boiling water shrinkage was calculated by the following formula.
[0048]
Boiling water shrinkage ratio (%) = [(L1-L2) / L1] × 100
E. CR
The crimped yarn was scraped off, treated in boiling water for 15 minutes in a load-free state, and then air-dried for 24 hours. 90 × 10 for this sample^-3A load equivalent to cN / dtex was applied and immersed in water, and the skein length L0 after 2 minutes was measured. Next, 90x10 in water^-31.8 × 10 excluding load equivalent to cN / dtex^-3The minute load corresponding to cN / dtex was exchanged, and the skein length L1 after 2 minutes was measured. And CR value was calculated by the following formula.
[0049]
CR (%) = [(L0−L1) / L0] × 100 (%)
F. Color tone (b * value)
After scouring, the woven or knitted fabric was laminated to such an extent that the base white plate could be ignored, and the b * value was measured using “Spectrophotometer CM-3700d” manufactured by Minolta. At this time, D65 (color temperature 6504K) was used as a light source, and measurement was performed in a 10 ° visual field.
[0050]
G. Cover factor for warp and weft
As described above, the warp cover factor (WCF) and the weft cover factor (FCF) were calculated by the following equations.
WCF = WN × (WT)^1/2
FCF = FN × (FT)^1/2
WN indicates the product weave density of the warp (number of warps per 2.54 cm), WT indicates the total fineness (decitex) before weaving the warp, and FN is the product weave density of the weft (2.54 cm). FT indicates the total fineness (decitex (dtex)) of the weft before weaving.
[0051]
H. Abrasion resistance (fast dry friction)
Based on JIS L0849, the dyed textile sample was rubbed back and forth 100 times with a cotton cloth, and the degree of color transfer to the cotton cloth was determined in five stages using a gray scale.
[0052]
I. Texture characteristics
The sample was subjected to a sensory test by paired comparison with a reference sample, and was evaluated in four stages. Then, by comprehensively evaluating them, “very good” was “◎”, “excellent” was “◯”, “normal” was “△”, and “poor” was “x”.
[0053]
[Production Example 1] (Production of polylactic acid)
Lactide produced from L-lactic acid having an optical purity of 99.5% was polymerized at 180 ° C. for 180 minutes in a nitrogen atmosphere in the presence of a bis (2-ethylhexanoate) tin catalyst (lactide to catalyst molar ratio = 10000: 1). And polylactic acid P1 having an optical purity of 98.5% was obtained. The obtained polylactic acid had a weight average molecular weight of 172,000. The amount of lactide remaining was 0.12% by weight.
[0054]
[Production Example 2] (Production of polylactic acid containing 5% by weight of EBA)
Polylactic acid P1 obtained in Production Example 1 and ethylene bis stearamide (hereinafter referred to as EBA) trade name “Alflow” H-50S manufactured by NOF Corporation are dried, and then P1: EBA = 95: 5 (Polylactic acid P2 containing 5% by weight of EBA was obtained by kneading at a cylinder temperature of 210 ° C. The amount of residual lactide of the obtained polylactic acid was 0.15% by weight.
[0055]
[Production Example 3] (Production of polylactic acid containing 6% by weight of EBA)
Polylactic acid P3 containing 6% by weight of EBA was obtained in the same manner as in Production Example 2 except that P1: EBA was changed to 94: 6 (weight ratio). The amount of residual lactide of the obtained polylactic acid was 0.14% by weight.
[0056]
[Production Example 4] (Production of polylactic acid containing 5% by weight of SS)
After drying the polylactic acid P1 obtained in Production Example 1 and N-stearyl stearamide (alkyl-substituted monoamide, hereinafter referred to as SS) manufactured by Nippon Kasei Co., Ltd., the product name “Nikka Amide S” was dried. The mixture was supplied to a twin-screw kneading extruder so that SS = 95: 5 (weight ratio), and kneaded at a cylinder temperature of 210 ° C. to obtain polylactic acid P4 containing 5% by weight of SS. The amount of residual lactide of the obtained polylactic acid was 0.15% by weight.
[0057]
[Production Example 5] (Production of polylactic acid containing 5% by weight of SA)
After drying the polylactic acid P1 obtained in Production Example 1 and stearic acid amide (monoamide, hereinafter referred to as SA) trade name “Alflow” S-10 manufactured by NOF Corporation, P1: SA = 95: 5 The mixture was supplied to a biaxial kneader / extruder so as to have a (weight ratio) and kneaded at a cylinder temperature of 210 ° C. to obtain polylactic acid P5 containing 5% by weight of SA. The amount of residual lactide of the obtained polylactic acid was 0.17% by weight.
[0058]
Example 1
The chips were blended (EBA 1% by weight) so that polylactic acid P1: polylactic acid P2 = 4: 1 by weight ratio, and then dried at 100 ° C. for about 10 hours in a vacuum dryer. The moisture content of the removed chip was about 60 ppm. This chip was charged into the hopper 1 and melted at 215 ° C. with the extruder 2, and then the molten polymer was introduced into the spin pack 4 incorporated in the spin block 3 heated to 225 ° C., with a pore diameter of 0.2 mm and a hole depth of 0. Spinning was performed from a base 5 having a diameter of 5 mm and 72 holes (see FIG. 1). At this time, the suction device 7 was installed at a position 10 cm below the base, and monomers and oligomers that sublimated at a suction speed of 25 m / min were removed. The spun yarn was cooled and solidified with a chimney 6 at 20 ° C. and a wind speed of 25 m / min, and then supplied with an oil supply device 8 installed 1.2 m below the base. For spinning oil, 78% by weight of polyether, 12% by weight of ether ester, and 10% by weight of other additives (antistatic agent, antioxidant, rust preventive agent) are adjusted as a smoothing agent. Was adjusted to a concentration of 15% by weight as a water emulsion and adhered to the fiber by 6% by weight (0.9% by weight as a pure oil). Next, entanglement is applied by the entanglement nozzle 9 at an operating pressure of air pressure of 0.1 MPa, taken up by the first godet roll 10 with a peripheral speed of 4400 m / min, and then taken up by the take-up device 12 through the second godet roll 11. , 60 dtex, 72 filament undrawn yarn (cheese-like package 13). There was no yarn breakage or fluffing during spinning, and the spinnability was good.
[0059]
Further, using a false false twisting machine, false twisting at a processing speed of 500 m / min, a disk rotation speed of 4500 rpm (using a 58 mm diameter urethane disk), a hot plate temperature of 130 ° C. (hot plate length of 1.8 m), and a draw ratio of 1.25 times. The false twisted yarn of 50 dtex and 72 filaments (single fiber fineness 0.7 dtex) was obtained. There was no yarn breakage or fluffing during false twisting, and false twisting was good.
[0060]
When the physical properties of the obtained false twisted yarn were measured, the strength was 2.2 cN / dtex, the elongation was 19%, the U% (Normal) was 0.88%, the boiling water shrinkage was 12%, and the CR was 20%. Both mechanical properties and crimp properties were excellent. Furthermore, after this false twisted yarn was added, a plain woven fabric (weave density: warp 130 / 2.54 cm, weft 95 / 2.54 cm) was produced using the warp and weft. In addition, the warp used was a yarn subjected to S twist of 300 turns / m. Further, the fabric was dyed under the following conditions to obtain a fabric product.
[0061]
<Fabric processing conditions>
・ Scouring: Soda ash (1 g / l), surfactant (0.5 g / l), 98 ° C. × 20 minutes
・ Intermediate set: 140 ℃ × 3 minutes
・ Dyeing: Dianix Navy Blue ERFS 200
(Dianix Navy Blue ERFS 200) (2% owf)
pH adjuster (0.2 g / l), 110 ° C. × 40 minutes
・ Soaping: Surfactant (0.2 g / l), 60 ° C. × 20 minutes
-Finishing set: 140 ° C x 3 minutes
The b * value of the scoured finished fabric was 2.6, indicating a good color tone. In addition, the weaving density of the finished product was 138 warps / 2.54 cm, 98 wefts / 2.54 cm, WCF976, FCF693, and FCF / WCF was 0.71. The rub fastness of this fabric was measured and it was grade 4, and it had good abrasion resistance. Moreover, when texture evaluation was performed, the texture which was excellent in all the aspects of a softness | flexibility, a swelling feeling, and coloring property was shown. Furthermore, a futon was made using this dyed fabric on the futon side, and a practical durability test was conducted for 3 months. As a result, there was no fluff and a soft texture was maintained. showed that.
[0062]
(Example 2, Example 3)
A textile product was obtained under the same conditions as in Example 1 except that the blend ratio of polylactic acid P1 and polylactic acid P2 was changed as follows. The fabric obtained in Example 2 with P1: P2 = 19: 1 had good spinnability, false twisting and weaving properties. In addition, the fastness to friction was grade 3, which was inferior to that of Example 1, but was practically satisfactory. In addition, the fabric obtained in Example 3 to which only polylactic acid P2 was supplied had good spinnability, false twisting, and weaving properties. The resulting fabric product had excellent friction fastness of 4th grade.
[0063]
(Comparative Example 1)
  A textile product was obtained under the same conditions as in Example 1 except that polylactic acid P1 was used.Comparative Example 1The woven fabric obtained by the above method had a severe color transfer due to the surface of the woven fabric being shaved by a friction fastness test, and it was extremely bad as grade 1, but it was excellent in texture characteristics and was not required for friction durability. It was usable.
[0064]
(Comparative example2)
  Comparative example using polylactic acid P3 containing 6% by weight of EBA as it is2Although the woven fabric obtained in (1) had excellent friction fastness, the color tone b * value after scouring was 5.3 and yellowish, and the saturation after dyeing was also reduced. In addition, dyed spots were seen in the textile product, and there was a practically problematic level.
[0065]
(Example4)
  A textile product is obtained under the same conditions as in Example 1 except that polylactic acid P4 is used instead of polylactic acid P2 and the chips are blended (SS1 wt%) so that the weight ratio is P1: P4 = 4: 1. It was. Example4The spinnability was also good, and there was almost no smoke immediately below the base, which was a satisfactory level. Further, both false twisting and weaving were good. Moreover, the friction fastness of the obtained textile product was the third grade, and although it was inferior to that of Example 1, it was a level with no practical problem.
[0066]
(Comparative example3)
  The same as Example 1 except that polylactic acid P5 added with fatty acid monoamide was used instead of polylactic acid P2 and the chips were blended (SA 1 wt%) so that the weight ratio was P1: P5 = 4: 1. A woven product was obtained under the conditions. Comparative example3When spinning, the working environment was extremely deteriorated due to severe smoke generation just below the base. Further, hot plate contamination was severe even in false twisting, and the process stability was poor. In addition, comparative examples3The woven fabric obtained in (1) was inferior in quality due to the fact that the fastness to friction was second grade and did not reach the practical level and there were stained spots.
[0067]
(Example5,Example6)
  Under the same conditions as in Example 1 except that a die having a hole diameter of 0.30 mm and a hole number of 24 holes was used so that the fineness configuration after false twisting was 50 dtex and 24 filaments (single fiber fineness 2.1 dtex). A woven product was obtained. Example5The spinning property, false twisting property and weaving property were all good. In addition, the obtained textile product was excellent in abrasion fastness with grade 4 fastness to friction, and color development was superior to that in Example 1.
[0068]
  Moreover, it is the same as Example 1 except having used the nozzle | cap | die of hole diameter 0.15mm and the number of holes of 192 holes so that the fineness structure after false twist processing may be 50 dtex and 192 filaments (single fiber fineness 0.26 dtex). Spinning was performed under conditions. Example6, Yarn breakage and fluff occurred during spinning and false twisting, and the number of stops during weaving was slightly high. Moreover, the obtained textile product was further excellent in flexibility than the textile obtained in Example 1.
[0069]
(Comparative example4Comparative example5)
  Under the same conditions as in Example 1 except that a die having a hole diameter of 0.30 mm and a hole number of 18 holes was used so that the fineness configuration after false twisting was 50 dtex and 18 filaments (single fiber fineness 2.8 dtex). A woven product was obtained. Comparative example4The woven product obtained in (1) was inferior in flexibility although it was excellent in abrasion resistance and color development. Moreover, it is the same as Example 1 except having used the nozzle | cap | die of hole diameter 0.12mm and the number of holes 200 holes so that the fineness structure after false twisting may be 50 dtex and 600 filaments (single fiber fineness 0.08 dtex). Spinning was performed under the conditions (three undrawn yarns were combined and false twisted to give 50 dtex, 600 filaments). Comparative example5Since yarn breakage occurred frequently during spinning, an undrawn yarn could not be stably obtained.
[0070]
(Example7,Example8)
  A textile product was obtained under the same conditions as in Example 1 except that the weaving density was changed as follows. Example in which weaving density after dyeing and finishing set was 150 / 2.54 cm, 86 weft / 2.54 cm (WCF: 1061, FCF: 608)7The woven fabric obtained in Example 3 had a friction fastness of 4th grade, and the texture was excellent as in Example 1. Further, an example in which the weaving density is warp 128 / 2.54 cm, weft 108 / 2.54 cm (WCF: 905, FCF: 764)8The woven fabric obtained in (2) increased the weft density, so the number of stops during weaving increased approximately twice. Moreover, the obtained textile product showed the outstanding friction fastness like the textiles obtained in Example 1.
[0071]
[Table 1]

[0072]
[Table 2]

[0073]
(In the table, “U%” means “U% Normal value”, “WCF” means “cover factor of warp”, “FCF” means “cover factor of weft”, “WCF / FCF” means “warp” Cover factor / weft cover factor ")
[0074]
【The invention's effect】
ADVANTAGE OF THE INVENTION According to this invention, the knitted fabric for bedding materials which consists of polylactic acid fiber which is excellent in abrasion resistance, and is soft and kind to skin is obtained. By using the knitted or knitted fabric for bedding material excellent in wear resistance of the present invention, it is possible to produce a bedding material that is excellent in practical durability, flexible and gentle to the skin.
[Brief description of the drawings]
FIG. 1 is a schematic view showing a spinning apparatus preferably used in the present invention.
[Explanation of symbols]
1: Hopper
2: Extruder
3: Spinning block
4: Spin pack
5: Spinneret
6: Suction device
7: Cooling chimney
8: Refueling device
9: Entanglement nozzle
10: First godet roll
11: Second godet roll
12: Winding device
13: Cheese package

Claims (4)

A multifilament made of polylactic acid containing 0.1 to 5% by weight of fatty acid bisamide and / or alkyl-substituted fatty acid monoamide based on the whole fiber and having a single fiber fineness of 0.1 to 2.4 dtex is used . A woven or knitted fabric for bedding material , wherein b * value which is an index of color tone is -1 to 5 .   2. The bedding material fabric according to claim 1, wherein the warp and / or the weft is a multifilament made of polylactic acid, and the woven structure is a plain weave structure.   The textile for bedding material according to claim 1 or 2, wherein the cover factor (WCF) of the warp and the cover factor (FCF) of the weft satisfy the following formula. 0.60 ≦ FCF / WCF ≦ 0.80 A bedding material using the woven or knitted fabric for bedding material according to any one of claims 1 to 3 .

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