WO2015041275A1 - 架橋アクリレート系繊維および該繊維を含有する繊維構造物 - Google Patents
架橋アクリレート系繊維および該繊維を含有する繊維構造物 Download PDFInfo
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- WO2015041275A1 WO2015041275A1 PCT/JP2014/074646 JP2014074646W WO2015041275A1 WO 2015041275 A1 WO2015041275 A1 WO 2015041275A1 JP 2014074646 W JP2014074646 W JP 2014074646W WO 2015041275 A1 WO2015041275 A1 WO 2015041275A1
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- fiber
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- moisture absorption
- linked
- acrylonitrile
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F8/00—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof
- D01F8/04—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers
- D01F8/08—Conjugated, i.e. bi- or multicomponent, artificial filaments or the like; Manufacture thereof from synthetic polymers with at least one polyacrylonitrile as constituent
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/22—Formation of filaments, threads, or the like with a crimped or curled structure; with a special structure to simulate wool
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01D—MECHANICAL METHODS OR APPARATUS IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS
- D01D5/00—Formation of filaments, threads, or the like
- D01D5/28—Formation of filaments, threads, or the like while mixing different spinning solutions or melts during the spinning operation; Spinnerette packs therefor
- D01D5/30—Conjugate filaments; Spinnerette packs therefor
- D01D5/32—Side-by-side structure; Spinnerette packs therefor
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- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F11/00—Chemical after-treatment of artificial filaments or the like during manufacture
- D01F11/04—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers
- D01F11/06—Chemical after-treatment of artificial filaments or the like during manufacture of synthetic polymers of macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
Definitions
- the present invention relates to a cross-linked acrylate fiber having both excellent crimping performance, particularly high bulkiness and entanglement, and high moisture absorption performance.
- Cross-linked acrylate fibers are known to have harmonious functions such as pH buffering, antistatic properties, water retention, high moisture absorption rate, high moisture absorption rate, high moisture absorption difference or temperature control / humidity control functions derived therefrom.
- Patent Documents 1 and 2 which are used in the clothing field and the industrial material field.
- the crosslinked acrylate fiber has a high moisture absorption rate, it has a feature that its bulkiness and shape stability are low. For this reason, card processing is difficult, and there has been a situation in which development for uses such as batting requires bulkiness.
- JP 7-216730 A JP-A-5-132858
- An object of the present invention is to provide a fiber that achieves both high moisture absorption / release properties and processability or bulkiness, which has not been provided in the prior art. Furthermore, a further object of the present invention is to provide a fiber structure having both moisture absorption performance that reduces moisture exothermic heat generation and stuffiness, and bulkiness that improves heat retention, which are useful in the field of clothing and bedding, for example. It is in.
- the cross-linked acrylate fiber of the present invention has both high moisture absorption performance and bulkiness, reduces stuffiness derived from body fluids generated from the body, and realizes a comfortable temperature and humidity environment due to heat retention. Moreover, it has entanglement property and it is possible to facilitate web creation in the card process.
- Such a cross-linked acrylate fiber of the present invention can be suitably used for clothes, bedding fillets and the like.
- the crosslinked acrylate fiber of the present invention is a fiber having a crosslinked structure and a carboxyl group of 2 to 10 mmol / g and having a crimp rate of 7% or more.
- the carboxyl group is a factor that develops characteristics such as hygroscopic and hygroscopic exothermic properties in the crosslinked acrylate fiber, and is 2 to 10 mmol / g, more preferably 5 to 10 mmol / g, and further preferably 5 to 8 mmol in the fiber. / G.
- the amount of carboxyl groups is less than 2 mmol / g, sufficient hygroscopic performance cannot be obtained in fiber structures mixed with other fibers, and if it exceeds 10 mmol / g, it becomes brittle during moisture absorption or water absorption, maintaining the fiber shape and moisture absorption performance. become unable.
- the crimping rate is specified in JIS L1015.
- the higher the crimping rate the easier the fibers and fibers are entangled with each other, and the bulk becomes higher when a fiber aggregate such as a web, nonwoven fabric, and spun yarn is formed.
- the crimp rate is 7% or more, preferably 10% or more. If the crimping ratio is less than 7%, the connection between the fibers in the card process becomes poor, and the bulkiness when the fiber assembly is made is low, so that the filling is mixed with other fibers and has sufficient thickness. The shape cannot be obtained.
- the bulkiness of the cross-linked acrylate fiber of the present invention is preferably 35 cm 3 / g or more, more preferably 40 cm 3 / g or more as a specific volume described later when used for a futon or clothing batting. Is desirable.
- the moisture absorption rate described later is preferably 15% or more, More preferably, it is 25% or more, and more preferably 35% or more.
- the upper limit of the moisture absorption rate is not particularly limited. However, since there is a limit to the amount of carboxyl groups introduced, the upper limit is approximately 70%.
- the acrylonitrile fiber that is the raw fiber of the crosslinked acrylate fiber of the present invention is produced from an acrylonitrile polymer according to a known method.
- the composition of the polymer is preferably 40% by weight or more of acrylonitrile, more preferably 50% by weight or more, and still more preferably 80% by weight or more.
- a crosslinked structure is introduced into the fiber by reacting the nitrile group of the acrylonitrile copolymer forming the acrylonitrile fiber with a nitrogen-containing compound such as a hydrazine compound.
- the cross-linked structure greatly affects the fiber properties.
- the copolymer component other than acrylonitrile in the acrylonitrile-based polymer is not particularly limited as long as it is a monomer copolymerizable with acrylonitrile, and specifically, sulfonic acid groups such as methallyl sulfonic acid and p-styrene sulfonic acid. -Containing monomers and salts thereof, carboxylic acid group-containing monomers such as (meth) acrylic acid and itaconic acid and salts thereof, monomers such as styrene, vinyl acetate, (meth) acrylic acid esters and (meth) acrylamides Etc.
- a means in which acrylonitrile fiber as a raw fiber is combined with two or more acrylonitrile polymers is effective.
- acrylonitrile fiber which is a composite of two acrylonitrile polymers with different acrylonitrile polymerization ratios
- the amount of cross-linked structure introduced in each acrylonitrile polymer region can be different, and hydrolysis A difference occurs in the degree of contraction during processing, and crimps can be expressed.
- the composite structure of the acrylonitrile polymer may be bonded side by side or randomly mixed, but it is a combination of two acrylonitrile polymers bonded side by side Is preferred.
- the difference in the acrylonitrile polymerization ratio of the two acrylonitrile polymers is preferably 1 to 10%, more preferably 1 to 5%, and the two acrylonitrile polymers.
- the composite ratio is preferably 20/80 to 80/20, more preferably 30/70 to 70/30.
- the form of the acrylonitrile fiber employed in the present invention may be any form such as short fiber, tow, yarn, knitted fabric, and non-woven fabric, and may be employed as an intermediate product in the manufacturing process, waste fiber, or the like.
- any conventionally known cross-linking agent can be used, but the use of a nitrogen-containing compound is effective in the cross-linking reaction and ease of handling.
- This nitrogen-containing compound needs to have two or more nitrogen atoms in one molecule. This is because a crosslinking reaction does not occur when the number of nitrogen atoms in one molecule is less than two.
- Specific examples of such nitrogen-containing compounds are not particularly limited as long as they can form a crosslinked structure, but amino compounds and hydrazine compounds having two or more primary amino groups are preferable.
- amino compounds having two or more primary amino groups include diamine compounds such as ethylenediamine and hexamethylenediamine, diethylenetriamine, 3,3′-iminobis (propylamine), N-methyl-3,3′-iminobis ( Triamine compounds such as propylamine), triethylenetetramine, N, N′-bis (3-aminopropyl) -1,3-propylenediamine, N, N′-bis (3-aminopropyl) -1,4- Examples include tetramine compounds such as butylenediamine, polyvinylamine, polyallylamine, and the like, and polyamine compounds having two or more primary amino groups.
- diamine compounds such as ethylenediamine and hexamethylenediamine, diethylenetriamine, 3,3′-iminobis (propylamine), N-methyl-3,3′-iminobis ( Triamine compounds such as propylamine), triethylenetetramine, N, N′-bis (3-aminopropy
- hydrazine compound examples include hydrazine hydrate, hydrazine sulfate, hydrazine hydrochloride, hydrazine hydrobromide, hydrazine carbonate, and the like.
- the upper limit of the number of nitrogen atoms in one molecule is not particularly limited, but is preferably 12 or less, more preferably 6 or less, and particularly preferably 4 or less. When the number of nitrogen atoms in one molecule exceeds the above upper limit, the cross-linking agent molecule becomes large and it may be difficult to introduce a cross-linked structure into the fiber.
- the conditions for introducing the cross-linked structure are not particularly limited, and take into account the reactivity between the cross-linking agent to be used and the acrylonitrile fiber, the amount of the cross-linked structure, moisture absorption, moisture absorption difference, fiber physical properties, etc. Can be selected.
- a hydrazine compound is used as the cross-linking agent
- the acrylonitrile fiber described above is immersed in an aqueous solution to which the hydrazine compound is added so that the hydrazine concentration is 0.5 to 40% by weight. Examples thereof include a method of treating at 5 ° C. within 5 hours.
- the fiber into which the crosslinked structure has been introduced is subjected to a hydrolysis treatment with an alkaline metal compound.
- a nitrile group present in the fiber is hydrolyzed to form a carboxyl group.
- Specific treatment conditions may be set as appropriate in consideration of the amount of carboxyl groups described above, and the like, and various conditions such as the concentration of the treatment agent, reaction temperature, reaction time, etc. are preferably set, but preferably 0.5 to 10% by weight, More preferably, means for treating in an aqueous solution of 1 to 5% by weight of a treating agent at a temperature of 50 to 120 ° C. for 1 to 10 hours is preferred from the industrial and fiber properties viewpoints.
- the above-described crosslinking introduction treatment and hydrolysis treatment can be collectively performed using an aqueous solution in which respective treatment chemicals are mixed.
- the carboxyl group includes a salt-type carboxyl group whose counter ion is a cation other than a hydrogen ion, and an H-type carboxyl group whose counter ion is a hydrogen ion.
- the ratio can be arbitrarily adjusted, but in order to obtain a high moisture absorption rate, it is desirable that 40% or more of the carboxyl groups are salt-type carboxyl groups.
- the types of cations constituting the salt-type carboxyl group include alkali metals such as lithium, sodium and potassium, alkaline earth metals such as magnesium and calcium, other metals such as manganese, copper, zinc and silver, NH 4 , Examples include cations such as amines, and one or a plurality of types can be selected according to the required characteristics.
- a polyvalent metal ion such as magnesium, calcium, or zinc
- the crimp rate tends to increase, which is preferable.
- acrylonitrile fiber obtained by bonding two kinds of acrylonitrile polymers side-by-side is subjected to the above-described crosslinking introduction and hydrolysis to form carboxyl groups, and magnesium, calcium, zinc as counter ions.
- a polyvalent metal ion such as such as is selected, a crosslinked acrylate fiber having a crimp rate of 10% or more can be easily obtained.
- Methods for adjusting the ratio of salt-type carboxyl groups to H-type carboxyl groups within the above range include ion exchange treatment with metal salts such as nitrates, sulfates and hydrochlorides, and acid treatments with nitric acid, sulfuric acid, hydrochloric acid, formic acid, etc.
- metal salts such as nitrates, sulfates and hydrochlorides
- acid treatments with nitric acid, sulfuric acid, hydrochloric acid, formic acid, etc Alternatively, a method of performing pH adjustment treatment with an alkaline metal compound or the like can be mentioned.
- the crosslinked acrylate fiber of the present invention if carboxyl groups are present throughout the fiber, more carboxyl groups can be introduced while suppressing fiber embrittlement and tackiness. A fiber having high practicality and high moisture absorption performance can be obtained. When a large amount of carboxyl groups are concentrated on a part of the fiber, the part may become brittle or sticky due to moisture absorption or water absorption.
- the carboxyl group is present only in the fiber surface layer portion, since the carboxyl group is not substantially present in the fiber center portion, embrittlement due to moisture absorption or the like is suppressed, and the fiber is difficult to sag. It can contribute to improvement. However, as described above, the amount of carboxyl groups is suppressed from the viewpoint of fiber embrittlement and adhesiveness.
- the cross-linked acrylate fiber of the present invention obtained as described above has a high moisture absorption rate and a characteristic that has sufficient crimp to obtain a practical bulkiness and card processability. For this reason, when the crosslinked acrylate fiber of the present invention is contained as a constituent fiber of the fiber structure, the heat retention is enhanced by the bulkiness obtained by the crimp, and the stuffiness derived from the body fluid generated from the body is reduced. It is considered that a comfortable humidity environment is realized.
- the crosslinked acrylate fiber of the present invention becomes more useful by forming a fiber structure alone or in combination with other materials. Appearance forms of such a fiber structure include cotton, yarn, knitted fabric, woven fabric, non-woven fabric, pile fabric, paper-like material, and the like.
- the form of inclusion of the crosslinked acrylate fiber of the present invention in the structure is either substantially uniformly distributed by mixing with other materials or in the case of a structure having a plurality of layers. There are those in which the cross-linked acrylate fibers of the present invention are concentrated in a layer (single or plural), and those in which the cross-linked acrylate fibers of the present invention are distributed in a specific ratio in each layer.
- Other materials that can be used in combination in the fiber structure of the present invention are not particularly limited, and publicly used natural fibers, organic fibers, semi-synthetic fibers, synthetic fibers are used, and inorganic fibers and glass fibers are also used. Some can be adopted. Specific examples include cotton, hemp, silk, wool, nylon, rayon, polyester, acrylic fiber, and the like. In addition, other materials used in combination may be materials such as feathers, resins, particles, and the like.
- the fiber structure of the present invention has innumerable combinations of appearance forms, inclusion forms, and other materials exemplified above. What kind of structure should be used depends on how the final product is used (for example, seasonality, mobility, inner / inner / outer clothing, filters, curtains / carpets, bedding / cushions, insoles, etc.) It is determined appropriately in consideration of the function to be performed, the way of contribution of the crosslinked acrylate fiber to the expression of such a function, and the like. For example, when the fiber structure is batting, combinations with polyester, wool, feathers and the like can be mentioned. In the case of futon batting, there is an example in which the cross-linked acrylate fiber of the present invention and feathers are mixed at a weight ratio of 5:95 to 75:25.
- the method for producing the batting of the present invention is not particularly limited, and a conventionally known method for producing batting can be applied.
- a method for producing batting it is possible to apply a method in which raw cotton is preliminarily defibrated and mixed with a defibrator and then processed into a web shape with a card machine.
- a process of entanglement of fibers such as a needle punch or a water punch, and an interfiber bonding process using a heat sealing resin may be added.
- the raw fiber was subjected to a crosslinking introduction treatment at 98 ° C. for 5 hours in a 20% by weight aqueous solution of hydrazine hydrate and washed.
- the cross-linked fiber was immersed in a 3% by weight nitric acid aqueous solution and subjected to acid treatment at 90 ° C. for 2 hours. Then, it hydrolyzed at 90 degreeC x 2 hours in 3 weight% sodium hydroxide aqueous solution, processed with 3.5 weight% nitric acid aqueous solution, and washed with water.
- the obtained fiber is immersed in water, adjusted to pH 11 by adding sodium hydroxide, and then immersed in an aqueous solution in which magnesium nitrate corresponding to twice the amount of carboxyl groups contained in the fiber is dissolved at 50 ° C. for 1 hour.
- an ion exchange treatment was carried out, followed by washing with water and drying to obtain a crosslinked acrylate fiber of Example 1 having an Mg salt type carboxyl group.
- the evaluation results of the obtained fiber are shown in Table 1. Further, when the infrared absorption measurement of the fiber was performed, absorption near 2250 cm ⁇ 1 derived from the nitrile group was not observed, and it was confirmed that the hydrolysis of the nitrile group progressed throughout the fiber and the carboxyl group was introduced. It was.
- Examples 2 and 3 Side-by-side raw material fibers having a single fiber fineness of 3.3 dtex were obtained in the same manner as in Example 1 except that the composite ratio of the acrylonitrile polymer Ap / Bp was changed within the range shown in Table 1. Using this raw material fiber, the treatment after the crosslinking introduction treatment was carried out in the same manner as in Example 1 to obtain the crosslinked acrylate fibers of Examples 2 and 3 having Mg salt type carboxyl groups. The evaluation results of these fibers are shown in Table 1. Also in the infrared absorption measurement of these fibers, as in the case of the crosslinked acrylate fiber of Example 1, no absorption near 2250 cm ⁇ 1 derived from a nitrile group was observed.
- Example 4 In Example 1, a fiber of Example 4 having a Ca salt type carboxyl group was obtained in the same manner except that calcium nitrate was used instead of magnesium nitrate. The evaluation results of the fibers are shown in Table 1.
- Example 5 In the aqueous solution containing 0.5% by weight of hydrazine hydrate and 2% by weight of sodium hydroxide, the side-by-side raw material fiber obtained in Example 1 was subjected to a cross-linking treatment and a hydrolysis at 100 ° C. for 1 hour. The decomposition treatment was performed at the same time, treated with an 8 wt% aqueous nitric acid solution, and washed with water. The obtained fiber is immersed in water, adjusted to pH 9 by adding sodium hydroxide, and then immersed in an aqueous solution in which magnesium nitrate corresponding to twice the amount of carboxyl groups contained in the fiber is dissolved at 50 ° C. for 1 hour.
- Example 5 having an Mg salt type carboxyl group.
- Table 1 The evaluation results of the obtained fiber are shown in Table 1. In the infrared absorption measurement of such a fiber, absorption is in the vicinity of 2250 cm ⁇ 1 derived from the nitrile group, and the hydrolysis of the nitrile group proceeds in the fiber surface layer portion, but the nitrile group is present in the fiber center portion. It was confirmed that it remained.
- Example 1 a raw material fiber composed only of a polymer Ap having a single fiber fineness of 3.3 dtex was similarly used except that only a spinning stock solution in which acrylonitrile-based polymer Ap was dissolved in a 48% by weight rhodasoda aqueous solution was used. Obtained. Using this raw material fiber, the treatment after the cross-linking introduction treatment was performed in the same manner as in Example 1 to obtain the fiber of Comparative Example 1. The evaluation results of the fibers are shown in Table 1.
- Example 6 In Example 1, the fiber of Example 4 which has Na salt type carboxyl group was obtained similarly except not performing the ion exchange process by magnesium nitrate. Table 2 shows the evaluation results of the fibers.
- Comparative Example 2 In Comparative Example 1, a fiber of Comparative Example 2 having a Na salt type carboxyl group was obtained in the same manner except that the ion exchange treatment with magnesium nitrate was not performed. Table 2 shows the evaluation results of the fibers.
- Examples 1 to 5 have both a high moisture absorption rate and bulkiness, they can be used as batting having a moisture conditioning function while maintaining heat retention.
- Comparative Example 1 the moisture absorption is equivalent, but the bulkiness is low.
- Example 6 good card processability was obtained, but in Comparative Example 2, the crimp rate was low and the card processability was poor.
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Abstract
Description
(1) 架橋構造および2~10mmol/gのカルボキシル基を有し、捲縮率が7%以上であることを特徴とする架橋アクリレート系繊維。
(2) カルボキシル基量が5~10mmol/gであることを特徴とする(1)に記載の架橋アクリレート系繊維。
(3) 捲縮率が10%以上であることを特徴とする(1)または(2)に記載の架橋アクリレート系繊維。
(4) カルボキシル基の対イオンとして、多価金属イオンを有することを特徴とする(1)から(3)のいずれかに記載の架橋アクリレート系繊維。
(5) 繊維全体にカルボキシル基が存在していることを特徴とする(1)から(4)のいずれかに記載の架橋アクリレート系繊維。
(6) 2種類のアクリロニトリル系重合体からなるサイド・バイ・サイド構造を有するアクリロニトリル系繊維に1分子中の窒素数が2以上である窒素含有化合物による架橋処理および加水分解処理を施して得られたものであることを特徴とする(1)から(5)のいずれかに記載の架橋アクリレート系繊維。
(7) (1)から(6)のいずれかに記載の架橋アクリレート系繊維を含有する繊維構造物。
(8) (1)から(6)のいずれかに記載の架橋アクリレート系繊維を含有する中綿。
繊維試料約1gを、50mlの1mol/l塩酸水溶液に30分間浸漬する。次いで、繊維試料を、浴比1:500で水に浸漬する。15分後、浴pHが4以上であることを確認したら、乾燥させる(浴pHが4未満の場合は、再度水洗する)。次に、十分乾燥させた繊維試料約0.2gを精秤し(W1[g])、100mlの水を加え、さらに、15mlの0.1mol/l水酸化ナトリウム水溶液、0.4gの塩化ナトリウムおよびフェノールフタレインを添加して撹拌する。15分後、濾過によって試料繊維と濾液に分離し、引き続き試料繊維を、フェノールフタレインの呈色がなくなるまで水洗する。このときの水洗水と濾液をあわせたものを、フェノールフタレインの呈色がなくなるまで0.1mol/l塩酸水溶液で滴定し、塩酸水溶液消費量(V1[ml])を求める。得られた測定値から、次式によって全カルボキシル基量を算出する。
カルボキシル基量[mmol/g]=(0.1×15-0.1×V1)/W1
繊維試料約2.5gを、熱風乾燥器で105℃、16時間乾燥して重量を測定する(W2[g])。次に、該繊維試料を、温度20℃、65%RHに調節した恒温恒湿器に24時間入れる。このようにして吸湿した繊維試料の重量を測定する(W3[g])。これらの測定結果から、次式によって20℃×65%RH吸湿率を算出する。
20℃×65%RH吸湿率[%]=(W3-W2)/W2×100
JIS L1015により測定、算出する。
JIS L1097により測定、算出する。
繊維長70mmの試料繊維50gを、温度30±5℃、50±10%RHに調節した室内で大和機工株式会社製サンプルローラーカード機(型番SC-300L)を用いてカードウェブを作成する。得られたウェブ形状について下記の基準で評価する。
○:絡合性が十分であり、斑のないウェブが得られる。
△:絡合性がやや不足し、ウェブに斑ができる。
×:絡合性が著しく不足して繊維同士が繋がらず、ウェブが得られない。
アクリロニトリル90重量%、アクリル酸メチルエステル10重量%のアクリロニトリル系重合体Ap(30℃ジメチルホルムアミド中での極限粘度[η]=1.5)、アクリロニトリル88重量%、酢酸ビニル12重量%のアクリロニトリル系重合体Bp([η]=1.5)をそれぞれ48重量%のロダンソーダ水溶液で溶解して、紡糸原液を調製した。特公昭39-24301号による複合紡糸装置にAp/Bpの複合比率が1/1となるようにそれぞれの紡糸原液を導き、常法に従って紡糸、水洗、延伸、捲縮、熱処理をして、単繊維繊度3.3dtexの重合体ApとBpを複合させたサイド・バイ・サイド型原料繊維を得た。
実施例1においてアクリロニトリル系重合体Ap/Bpの複合比率を表1に示す範囲で変化させること以外は同様にして、単繊維繊度3.3dtexのサイド・バイ・サイド型原料繊維を得た。この原料繊維を用いて、実施例1と同じ方法で架橋導入処理以降の処理を行い、Mg塩型カルボキシル基を有する実施例2及び3の架橋アクリレート系繊維を得た。これらの繊維の評価結果を表1に示す。また、これらの繊維の赤外線吸収測定においても、実施例1の架橋アクリレート系繊維と同様に、ニトリル基に由来する2250cm-1付近の吸収は見られなかった。
実施例1において、硝酸マグネシウムの代わりに、硝酸カルシウムを使用すること以外は同様にして、Ca塩型カルボキシル基を有する実施例4の繊維を得た。該繊維の評価結果を表1に示す。
実施例1において得られたサイド・バイ・サイド型原料繊維に、水加ヒドラジン0.5重量%および水酸化ナトリウム2重量%を含有する水溶液中で、100℃×1時間、架橋導入処理及び加水分解処理を同時に行い、8重量%硝酸水溶液で処理し、水洗した。得られた繊維を水に浸漬し、水酸化ナトリウムを添加してpH9に調整した後、繊維に含まれるカルボキシル基量の2倍に相当する硝酸マグネシウムを溶解させた水溶液に50℃×1時間浸漬することによりイオン交換処理を実施し、水洗、乾燥することにより、Mg塩型カルボキシル基を有する実施例5の繊維を得た。得られた繊維の評価結果を表1に示す。なお、かかる繊維の赤外線吸収測定においては、ニトリル基に由来する2250cm-1付近に吸収があり、繊維表層部においてはニトリル基の加水分解が進行しているが、繊維中心部においてはニトリル基が残存していることが確認された。
実施例1において、アクリロニトリル系重合体Apを48重量%のロダンソーダ水溶液で溶解した紡糸原液のみを用いること以外は同様にして、単繊維繊度3.3dtexの重合体Apのみで構成された原料繊維を得た。この原料繊維を用いて、実施例1と同じ方法で架橋導入処理以降の処理を行い、比較例1の繊維を得た。該繊維の評価結果を表1に示す。
実施例1において、硝酸マグネシウムによるイオン交換処理を実施しないこと以外は同様にして、Na塩型カルボキシル基を有する実施例4の繊維を得た。該繊維の評価結果を表2に示す。
比較例1において、硝酸マグネシウムによるイオン交換処理を実施しないこと以外は同様にして、Na塩型カルボキシル基を有する比較例2の繊維を得た。該繊維の評価結果を表2に示す。
Claims (8)
- 架橋構造および2~10mmol/gのカルボキシル基を有し、捲縮率が7%以上であることを特徴とする架橋アクリレート系繊維。
- カルボキシル基量が5~10mmol/gであることを特徴とする請求項1に記載の架橋アクリレート系繊維。
- 捲縮率が10%以上であることを特徴とする請求項1または2に記載の架橋アクリレート系繊維。
- カルボキシル基の対イオンとして、多価金属イオンを有することを特徴とする請求項1から3のいずれかに記載の架橋アクリレート系繊維。
- 繊維全体にカルボキシル基が存在していることを特徴とする請求項1から4のいずれかに記載の架橋アクリレート系繊維。
- 2種類のアクリロニトリル系重合体からなるサイド・バイ・サイド構造を有するアクリロニトリル系繊維に1分子中の窒素数が2以上である窒素含有化合物による架橋処理および加水分解処理を施して得られたものであることを特徴とする請求項1から5のいずれかに記載の架橋アクリレート系繊維。
- 請求項1から6のいずれかに記載の架橋アクリレート系繊維を含有する繊維構造物。
- 請求項1から6のいずれかに記載の架橋アクリレート系繊維を含有する中綿。
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