JPH09158047A - Surface treatment of cellulosic fiber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To impart durable touch feeling and smoothness like a protein-based fiber to the surface of a cellulosic fiber by binding a specific silylated peptide to the surface of a cellulosic fiber. SOLUTION: A silylated peptide of formula I at least one among R<1> , R<2> and R<3> is OH and the remainders are a 1-3C alkyl or OH; R<4> is a residue excluding a terminal amino group of a basic amino acid having amino group at the end of side chain; R<5> is an amino acid side chain other than R<4> ; (a) is 1 or 3; (m) and (n) are each 0-100 and (m)+(n) is 1-100 [(m) and (n) exhibit only number of amino acids and do not exhibit order of amino acids] or formula II, etc., covalently bonding a functional group containing only one silicon atom to amino group of a peptide containing amino group of amino acid side chain is bonded to the surface of a cellulosic fiber. The imparted properties are not readily lost even by cleaning action of washing, etc.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for treating the surface of a cellulosic fiber, and more specifically, a cellulose which imparts a texture, feel and smoothness to the surface of the cellulosic fiber like a protein fiber having durability. TECHNICAL FIELD The present invention relates to a method for surface treating a fiber.

[0002]

2. Description of the Related Art As a surface treatment method for cellulosic fibers, for example, as disclosed in JP-A-62-62989, vegetable fiber yarn is dipped in a protein solution of collagen, keratin, fibroin or the like or a protein derivative solution thereof, and twisted. After that, a method of performing steam setting has been proposed, and according to the above-mentioned publication, it is reported that a shape memory plant fiber yarn having excellent wrinkle resistance and a supple and silk-like feel is obtained. .

However, in the above-mentioned method, animal protein is adsorbed on vegetable protein of fiber thread.
It is said that protein adsorption is due to ionic bond between amino acid side chains of two proteins, hydrogen bond and van der Waals force that attracts hydrophobic side chains. These bonds are easily dissociated by washing. Therefore, there is a problem that the imparted properties are lost by washing. Furthermore, since the protein contained in the plant fiber yarn is very small, the amount of animal protein that can be bound is also very small, and therefore, the feel is not sufficiently improved.

[0004]

As described above, regarding the vegetable fiber, a method for improving the feeling has been proposed, but the vegetable fiber having a feeling like a protein fiber which is still durable. Has not been obtained.

Therefore, the present invention imparts to the cellulosic fibers the feel and smoothness of protein-based fibers which are not possessed by cellulosic fibers such as vegetable fibers, and the imparted property is a washing action such as washing. It is an object of the present invention to provide a surface treatment method for cellulosic fibers, which does not easily disappear even by

[0006]

Means for Solving the Problems As a result of intensive studies to achieve the above object, the present inventors have found that a functional group containing only one silicon atom in the amino group of a peptide containing the amino group of the amino acid side chain. When the covalently bonded silylated peptide is bonded to the surface of the cellulosic fiber, it is possible to give the surface of the cellulosic fiber the feel and smoothness of a protein fiber, and the bonding method is Since the technique is completely different from the technique, it was found that the properties imparted to the cellulosic fiber are not easily lost even by a washing action such as washing, and the present invention has been completed.

That is, according to the present invention, the hydroxyl group bonded to the silicon atom of the silylated peptide and the hydroxyl group on the cellulose sugar chain of the cellulosic fiber undergo a binding reaction, so that the peptide portion of the peptide group is bonded to the cellulosic group via the silyl group. By binding to the surface of the fiber and forming a film by the peptide portion, the cellulosic fiber can be imparted with gloss, smoothness, and moist feeling. Moreover, since the bond between the cellulosic fiber and the silylated peptide is due to the covalent bond between the silicon atom and the oxygen atom, it is difficult to be removed by the washing action such as washing, and thus the imparted property is easily lost. do not do.

Examples of the silylated peptide in which the functional group containing only one silicon atom is covalently bonded to the amino group of the peptide containing the amino group of the above amino acid side chain include, for example, the following general formula (I)

[0009]

Embedded image

[In the formula, at least one of R ¹ , R ² and R ³ represents a hydroxyl group, and the remainder represents an alkyl group having 1 to 3 carbon atoms or a hydroxyl group. R ⁴ represents a residue excluding the terminal amino group of a basic amino acid having an amino group at the end of the side chain, R ⁵ represents an amino acid side chain other than R ⁴ , a is 1 or 3, and m is 0 to 100, n is 0 to 100, m + n is 1
To 100 (provided that m and n only indicate the number of amino acids, but not the order of amino acid sequences)], or a general formula (II) below.

[0011]

Embedded image

[In the formula, at least one of R ¹ , R ² and R ³ represents a hydroxyl group, and the remainder represents an alkyl group having 1 to 3 carbon atoms or a hydroxyl group. R ⁴ represents a residue excluding the terminal amino group of a basic amino acid having an amino group at the end of the side chain, R ⁵ represents an amino acid side chain other than R ⁴ , a is 1 or 3, and m is 0 to 100, n is 0 to 100, m + n is 1
To 100 (however, m and n only indicate the number of amino acids, and do not indicate the order of amino acid sequences)].

The silylated peptide represented by the above general formula (I) is, for example, the following general formula (III)

[0014]

Embedded image

[In the formula, at least one of R ⁶ , R ⁷ , and R ⁸ represents an alkoxy group having 1 to 3 carbon atoms, a hydroxyl group or a halogen atom, and the rest are alkyl groups having 1 to 3 carbon atoms,
An alkoxy group having 1 to 3 carbon atoms, a hydroxyl group or a halogen atom is shown. a is 1 or 3, X is Cl, Br, F, I
And a silyl compound represented by the following general formula (IV)

[0016]

[Chemical 6]

[In the formula, R ⁴ represents a residue of a basic amino acid having an amino group at the end of a side chain, excluding the amino group, and R ⁵
Represents a side chain of an amino acid other than R ⁴ , m is 0 to 100,
n is 0 to 100, and m + n is 1 to 100].

The silylated peptide represented by the general formula (II) is, for example, the following general formula (V)

[0019]

Embedded image

[In the formula, at least one of R ⁶ , R ⁷ and R ⁸ represents an alkoxy group having 1 to 3 carbon atoms, a hydroxyl group or a halogen atom, and the rest are alkyl groups having 1 to 3 carbon atoms,
An alkoxy group having 1 to 3 carbon atoms, a hydroxyl group or a halogen atom is shown. a represents 1 or 3] and a silyl compound represented by the general formula (IV) are subjected to a condensation reaction.

In the silylated peptide represented by the general formula (I) or the silylated peptide represented by the general formula (II),
R ¹ , R ² and R ³ are specified as described above because the silylated peptide represented by the general formula (I) and the general formula (II)
This is because the silylated peptide represented by has a functional group that reacts with the cellulosic fiber, is water-soluble, and allows the treatment liquid for the cellulosic fiber to maintain good storage stability. Further, a is specified as 1 or 3. When a is 2, the storage stability of the silyl compound represented by the general formula (III) or the silyl compound represented by the general formula (V) is poor,
This is because if a is larger than 3, the proportion of the silyl functional group portion in the whole molecule becomes small, and the properties of the silyl functional group cannot be fully exhibited.

In the silylated peptide represented by the general formula (I) and the silylated peptide represented by the general formula (II),
R ⁴ is a residue excluding the terminal amino group of a basic amino acid having an amino group at the terminal of the side chain. Examples of the basic amino acid having an amino group at the terminal of the side chain as described above include lysine, Examples include arginine and hydroxylysine. R ⁵ represents a side chain of an amino acid other than R ⁴ , and examples of such an amino acid include glutamic acid, aspartic acid, alanine, serine, threonine,
Valine, methionine, leucine, isoleucine, tyrosine, phenylalanine, proline, hydroxyproline and the like can be mentioned.

In the silylated peptide represented by the general formula (I) and the silylated peptide represented by the general formula (II),
m is 0 to 100, preferably greater than 0 and 10 or less (0 <m ≦ 10), n is 0 to 100, preferably 2 to 40, and m + n is 2 to 100, preferably 3
˜50, which is due to the following reason.

That is, when m is larger than the above range, the number of silyl functional groups bonded to the amino group of the side chain is increased, and the film forming action and moisturizing feeling of the peptide portion are reduced,
When n is larger than the above range, the ratio of the silyl functional group portion to the peptide portion becomes small, and the characteristics of the silyl functional group portion cannot be sufficiently exhibited,
When m + n is larger than the above range, the film-forming property of the peptide portion becomes too strong, giving a rough feeling to the surface of the cellulosic fiber, and the treatment liquid of the cellulosic fiber easily aggregates during storage. This is because the storage stability decreases.

The above m, n and m + n are theoretically integers, but when the peptide portion is a hydrolyzed peptide described below, the hydrolyzed peptide is obtained as a mixture of different molecular weights. , The measured value is an average value.

The peptides represented by the above general formula (IV) include amino acids, peptides, esters of amino acids or peptides. Examples of the above amino acids include:
Alanine, glycine, valine, leucine, isoleucine, proline, phenylalanine, tyrosine, serine,
Threonine, methionine, arginine, histidine, lysine, asparagine, aspartic acid, glutamine, glutamic acid, cystine, cysteine, cysteic acid, tryptophan, hydroxyproline, hydroxylysine, O-phosphoserine, citrulline and the like can be mentioned.

The above peptides include natural peptides, synthetic peptides, hydrolyzed peptides obtained by partially hydrolyzing a protein (protein) with an acid, an alkali or an enzyme.

Examples of natural peptides include glutathione, bacitracin A, insulin, glucagon, oxytocin, vasopressin and the like, and examples of synthetic peptides include polyglycine, polylysine, polyglutamic acid, polyserine and the like.

Examples of hydrolyzed peptides include collagen (including its modified product gelatin), keratin, silk fibroin, sericin, casein, conchiolin, elastin, chicken, egg yolk protein of egg, etc.
Protein (protein) derived from plants and animals, such as egg white protein, soy protein, wheat protein, corn protein, rice (rice bran) protein, potato protein, or
Yeast proteins and mushrooms (basidiomycetes) isolated from yeasts of the genera Saccharomyces, Candida, and Endomycopsis, and so-called brewer's yeast and sake yeast.
More extracted proteins, proteins derived from microorganisms such as proteins separated from Chlorella, such as peptides obtained by partially hydrolyzing with acid, alkali or enzyme, in particular hydrolyzed collagen peptide, hydrolyzed keratin peptide, Cellulosic fibers treated with silylated peptides using hydrolyzed fibroin peptides etc. have a good feel, and in particular cellulosic fibers treated with silylated peptides using hydrolyzed fibroin peptides have silky feel and smoothness. It is preferable to have

The ester of the above amino acid or peptide is an ester with a hydrocarbon alcohol having 1 to 20 carbon atoms in the carboxyl group of the above amino acid or peptide, for example, methyl ester, ethyl ester, propyl ester, isopropyl ester, lauryl ester, Cetyl ester, 2-ethylhexyl ester, 2
-Hexyldecyl ester, stearyl ester and the like.

The silylated peptide represented by the general formula (I) or the silylated peptide represented by the general formula (II) is a silyl compound represented by the general formula (III) or the general formula (V).
The silyl compound represented by the formula (IV) and the peptides represented by the general formula (IV) are reacted with each other to obtain a silyl compound represented by the general formula (III) or the general formula (V). As the silyl compound, a commercially available silane coupling agent can be used. Examples of such silane coupling agents include TSL8390, TSL8219, and TSL8 manufactured by Toshiba Silicone Co., Ltd.
395, TSL8326, TSL8325, TSL83
20, TSL8355, TSL8350 (all are trade names), A-143 (trade name) manufactured by Nippon Unicar Co., Ltd., S manufactured by Toray Dow Corning Silicone Co., Ltd.
H6040, SH6076 (both are trade names), Shin-Etsu Silicone Co., Ltd. KBE403, KBE402, K
BE703 (both are trade names) and the like.

The silyl compound represented by the general formula (III) or the silyl compound represented by the general formula (V) and the general formula (IV)
In the reaction with the peptides represented by, for example, first, the silyl compound is stirred in water at 30 to 50 ° C. for 5 to 20 minutes to be hydrolyzed to hydrolyze an alkoxy group or a halogen atom bonded to a silicon atom to a hydroxyl group. After conversion into, the hydroxylated silyl compound is added dropwise to the solution of the peptide represented by the general formula (IV), and both are brought into contact with each other.

In the above reaction, 5 to 20 peptides were used.
It is preferable to use an aqueous solution of about wt%, and the dropping of the hydroxylated silyl compound is preferably completed in 30 minutes to 5 hours.

When the silyl compound represented by the general formula (III) is used, during the reaction, hydrogen halide is produced by the reaction and the pH of the reaction solution is lowered. It is preferable to maintain the pH in the reaction system at 8 to 11, particularly 9 to 10, by dropping an alkaline solution such as. When the silyl compound represented by the general formula (V) is used, the pH does not decrease due to the reaction, but the reaction proceeds in a basic manner, so the pH of the peptide solution is 8 to 11, particularly 9 to 10. It is preferable that

The reaction proceeds at room temperature, but the higher the temperature, the faster the reaction rate. However, since the hydrolysis of the silyl compound is promoted when the temperature rises in a high pH state, the temperature is preferably 70 ° C or lower at the highest, and particularly preferably 40 to 60 ° C.

The progress and completion of the reaction can be confirmed by measuring the amount of amino nitrogen of the peptides in the reaction by the van Slyke method.

After the completion of the reaction, the reaction solution is neutralized, then appropriately concentrated, and purified by ion exchange resin, dialysis membrane, electrodialysis, gel filtration, ultrafiltration, etc., and is left as a liquid or powdered to give cellulose. It is used for the surface treatment of system fibers.

In the silylated peptide represented by the general formula (I) or the silylated peptide represented by the general formula (II), the silyl functional group (ie,
The introduction rate of the functional group containing only one silicon atom) is preferably 50% or more and 85% or less. Introduction rate of silyl functional group is 50
If it is less than%, the number of bonds to the hydroxyl group on the cellulose sugar chain of the cellulosic fiber is reduced, the bond between the silylated peptide and the cellulosic fiber is weakened, and it tends to be released by washing or the like. When the introduction rate of the silyl functional group is more than 85%, the hydrophobicity tends to increase and the dispersibility of the silylated peptide in the treatment liquid of the cellulosic fiber tends to deteriorate.

The surface treatment of the cellulosic fiber is carried out by immersing the cellulosic fiber in the aqueous solution of the silylated peptide and then heating and drying. At this time, the hydroxyl group of the silyl functional group portion of the silylated peptide and the hydroxyl group on the cellulose sugar chain of the cellulosic fiber undergo a condensation reaction,
The silylated peptide binds to the surface of the cellulosic fiber.

Examples of cellulosic fibers include cotton,
Examples thereof include plant fibers such as hemp, human silk produced from fibrin, recycled fibers such as suf, and semi-synthetic fibers such as acetic acid artificial fibers produced from fibrin as a raw material.

The form of the cellulosic fibers at the time of treatment may be any of yarn, woven fabric, non-woven fabric and the like.

In the surface treatment of the cellulosic fiber, the silylated peptide is preferably made into an aqueous solution of about 1 to 20% by weight, and the bath ratio to the cellulosic fiber is preferably about 1:10 to 1: 200. That is, when the concentration of the silylated peptide in the treatment liquid of the cellulosic fiber becomes higher than the above range or when the bath ratio to the cellulosic fiber becomes larger than the above range, the silylated peptide bonded to the cellulosic fiber becomes too much to be treated. A feeling of stiffness is generated in the subsequent cellulosic fiber, on the other hand, when the concentration of the silylated peptide in the treatment liquid of the cellulosic fiber becomes lower than the above range, or the bath ratio to the cellulosic fiber becomes smaller than the above range, the cellulosic fiber There is a possibility that it may not be possible to impart the feel, smoothness and the like of protein-based fibers.

The immersion time of the cellulosic fibers in the treatment liquid is preferably about 5 minutes to 5 hours. Although the condensation reaction between the silylated peptide and the cellulosic fiber proceeds at room temperature, it proceeds faster when the liquid temperature is 30 ° C to 60 ° C.

After dipping, the cellulosic fiber is added to 60-100.
The reaction is completed by heating and drying at ℃ for 1 to 2 hours, washing with water to remove unreacted silylated peptide, and drying to obtain the silylated peptide-bonded cellulosic fiber.

The degree of binding of the silylated peptide to the cellulosic fiber can be confirmed by analysis of the nitrogen content of the cellulosic fiber or quantitative analysis of silicon atoms by atomic absorption measurement. The amount of the silylated peptide bound to the cellulosic fiber may vary depending on the type of the fiber and the silylated peptide, particularly the type of the peptide portion, but the silylated peptide is usually 0.2% by weight of the cellulosic fiber. It is preferably about 8% by weight.

[0046]

EFFECTS OF THE INVENTION According to the present invention, the feel and smoothness of protein fibers can be easily imparted to the surface of cellulosic fibers. Further, according to the treatment method of the present invention, the hydroxyl group bonded to the silicon atom of the silylated peptide and the hydroxyl group on the cellulose sugar chain of the cellulosic fiber are bonded, and the peptide moiety is the surface of the cellulosic fiber via the silyl group. Therefore, the silylated peptide bound to the surface of the cellulosic fiber is not easily released by the washing action such as washing, and therefore the property imparted to the cellulosic fiber by the silylated peptide is not easily lost. .

[0047]

BEST MODE FOR CARRYING OUT THE INVENTION Next, the present invention will be described more specifically with reference to Examples. However, the present invention is not limited to only these examples. In the following examples and the like,% indicating the concentration of the solution is% by weight.

Example 1 and Comparative Example 1 In Example 1, all of R ¹ , R ² and R ³ in formula (II) were OH as the silylated peptide.
, A = 3, average value of m = 1.4, average value of n = 18.
6, average value of m + n = 20, introduction rate of silyl functional group 6
600 g of a 5% aqueous solution of 7% silylated hydrolyzed collagen peptide was prepared and kept at 40 ° C. A commercially available cotton bleached cloth (6.8 g, 15 cm square) was dipped in this for 20 minutes to slightly squeeze out water, and then heated and dried in a constant temperature bath at 100 ° C. for 2 hours. After drying, wash the cotton cloth under running water for about 1 minute.
It heat-dried for 20 minutes in a 0 degreeC thermostat. This washing-drying operation was repeated 10 times, and a part of the treated cloth was cut out at the stage after the first, third, fifth and tenth washing-drying, and the nitrogen content and silicon content contained were measured.

In Comparative Example 1, instead of the silylated peptide, the average value of m = 1.4 and the average value of n = 18.
6, a cotton cloth was prepared in the same manner as in Example 1 except that a 5% aqueous solution of hydrolyzed collagen peptide [Promois W-52 (trade name) manufactured by Seiwa Kasei Co., Ltd.] having an average value of m + n = 20 was used. The nitrogen content and the silicon content of the cotton cloth after treatment, washing and drying were measured.

The results are shown in Table 1. The nitrogen content was measured by Sumitomo Chemical Co., Ltd., total carbon total nitrogen analyzer NC.
-90 and analyzed for silicon, the sample is nitric acid-
Wet decomposition method with perchloric acid (JIS K 0102 method)
After decomposing by the method described above, the decomposed solution was neutralized, and a flameless analysis was performed using a graphite atomizer with an AA-680G atomic absorption spectrometer manufactured by Shimadzu Corporation. All reagents used for analysis are precision analysis reagents.

[0051]

[Table 1]

As shown in Table 1, the cotton cloth treated with the silylated hydrolyzed collagen peptide of Example 1 was washed 3
After the first time, almost no decrease in nitrogen content and silicon content was observed. Since silicon is contained in tap water, it was already detected in untreated cotton cloth by washing the cotton cloth with tap water, but the cotton cloth treated with silylated hydrolyzed peptide collagen was washed 5 times. The amount of silicon was about twice that of the untreated cotton cloth, and the amount of silicon was hardly reduced by the subsequent washing. On the other hand, in the cotton cloth treated with the hydrolyzed collagen peptide of Comparative Example 1, the amount of nitrogen decreased as the number of times of washing increased, and most of the hydrolyzed collagen peptide adsorbed on the cotton cloth was washed away by 10 times of washing. .

From the above results, it was clear that the silylated hydrolyzed collagen peptide was bound to the cotton cloth and was not easily released by washing. The amount of the silylated hydrolyzed collagen peptide bound to the cotton cloth was about 2% of the weight of the cotton cloth.

Example 2 and Comparative Example 2 In Example 2, as the silylated peptide, R ¹ ═CH ₃ , R ² ═OH and R ³ ═O in the general formula (I) were used.
H, a = 1, average value of m = 2, average value of n = 8, m +
A cotton cloth was treated in the same manner as in Example 1 except that an 8% aqueous solution of silylated hydrolyzed keratin peptide having an average value of n = 10 and a silyl functional group introduction rate of 61% was used. And the amount of silicon were measured.

In Comparative Example 2, instead of the silylated peptide, the average value of m = 2, the average value of n = 8, and m + n.
8% of hydrolyzed keratin peptide [Promois WK-H (trade name) manufactured by Seiwa Kasei Co., Ltd.] having an average value of 10 and SH200-350cs manufactured by Toray Dow Corning Silicone Co., Ltd. as silicone oil. Example 1 except that an aqueous solution containing 1% of (brand name)] was used.
A cotton cloth was treated in the same manner as above, and the nitrogen content and silicon content after washing and drying were measured. Table 2 shows the results.

[0056]

[Table 2]

As is clear from the results shown in Table 2, the cotton cloth treated with the silylated hydrolyzed keratin peptide of Example 2 showed almost no decrease in nitrogen content and silicon content after the third washing. On the other hand, in the cotton cloth treated with the hydrolyzed keratin peptide and silicone of Comparative Example 2, the nitrogen content and the silicon content were decreased as the number of washings was increased. From these results, it was clear that the silylated hydrolyzed keratin peptide bound to the cotton cloth and was not easily released by washing. The amount of the silylated hydrolyzed keratin peptide bound to the cotton cloth was about 3.6% of the weight of the cotton cloth.

Example 3 and Comparative Example 3 In Example 3, as the silylated peptide, R ¹ ═CH ₃ , R ² ═OH and R ³ ═O in the general formula (II) were used.
H, a = 3, average value of m = 0.8, average value of n = 6.
2, average value of m + n = 7, introduction rate of silyl functional group 59
% Cotton cloth was treated as in Example 1 except that a 2% aqueous solution of silylated hydrolyzed fibroin peptide was used.
The amount of nitrogen and the amount of silicon after washing-drying were measured.

Further, in Comparative Example 3, instead of the silylated hydrolyzed fibroin peptide, the average value of m = 0.
8, the average value of n = 6.2, the average value of m + n = 7, except that a 2% aqueous solution of hydrolyzed fibroin peptide [Promois S-700SP (trade name) manufactured by Seiwa Kasei Co., Ltd.] was used, A cotton cloth was treated in the same manner as in Example 1, and the nitrogen content and silicon content after washing and drying were measured. Table 3 shows the results.

[0060]

[Table 3]

As is clear from the results shown in Table 3, the cotton cloth treated with the silylated hydrolyzed fibroin peptide of Example 3 showed almost no decrease in nitrogen content and silicon content after the third and subsequent washings. However, in the cotton cloth treated with the hydrolyzed fibroin peptide of Comparative Example 3, the nitrogen content and the silicon content decreased as the number of washings increased. From these results it was clear that the silylated hydrolyzed fibroin peptide bound to the cotton cloth and it was not easily released by washing. The amount of the silylated hydrolyzed fibroin peptide bound to the cotton cloth was about 1.3% of the weight of the cotton cloth.

[Measurement of Smoothness of Cotton Fabric Surface] The treatment was carried out in the above Examples 1 to 3 and Comparative Examples 1 to 3 and washed 10 times.
The smoothness of the surface of the dried cotton cloth was measured using a friction tester KES-SE manufactured by Kato Tech Co., Ltd. and compared with the measured value of the untreated cotton cloth. In this device, the smoothness (roughness) is represented by the average deviation of the friction coefficient felt by the friction member moving a certain distance on the surface of the sample, and the unit is dimensionless.
It shows that it is “smooth”.

Table 4 shows the average deviation of the friction coefficient when the friction member moved 2 cm on the surface of each sample. The measured value is the average value of the measured values of each sample three times. Further, in the display, untreated, Example 1, Comparative Example 1, Example 2, Comparative Example 2, Example 3, so that the difference in smoothness between the corresponding Example and Comparative Example can be easily understood. Display in the order of Comparative Example 3.

[0064]

[Table 4]

As shown in Table 4, the average deviation value of the friction coefficient of the cotton cloths surface-treated with the silylated peptides of Examples 1 to 3 is 1 of the average deviation value of the friction coefficient of the untreated cotton cloths. It was / 2 or less, and it was clear that the silylated peptide was bound to the surface of the cotton cloth to give the cotton cloth smoothness. On the other hand, the average deviation value of the friction coefficient of the cotton cloth treated with the hydrolyzed peptides of Comparative Examples 1 to 3 is:
Although it is smaller than the average deviation of the friction coefficient of the untreated cotton cloth, it is about twice the value of the cotton cloth treated with the silylated peptide of Examples 1 to 3, and the cotton treated with the hydrolyzed peptide is It has been revealed that it is not possible to impart sufficient smoothness to the cloth.

[Sensory Evaluation Test of Cotton Cloth] Examples 1 to 1 above
3 and Comparative Examples 1 to 3 and washed and dried 10 times, the softness of the surfaces of the cotton cloth (treated cloth) and the untreated cotton cloth (untreated cloth), the firmness of the cloth and the moist feeling (moisturizing feeling). ) Was evaluated by 5 panelists. In the evaluation, the best one was ranked first and the worst one was ranked seventh. The results are shown in Table 5, and the ranking is shown by the average value of 5 persons.

[0067]

[Table 5]

As shown in Table 5, the cotton cloths surface-treated with the silylated peptides of Examples 1 to 3 were not treated with the hydrolyzed peptide of Comparative Examples 1 to 3 or the untreated cotton cloths in any of the evaluation items. The rank was higher than that of the treated cotton cloth (untreated cloth), and the effect of surface treatment with silylated peptide was clarified.

Claims (5)

[Claims] 1. A cellulose characterized in that a silylated peptide having a functional group containing only one silicon atom covalently bonded to the amino group of a peptide containing an amino group of an amino acid side chain is bonded to the surface of a cellulosic fiber. Of surface treatment of base fiber. 2. A silylated peptide is represented by the following general formula (I): [In the formula, at least one of R ¹ , R ² , and R ³ represents a hydroxyl group, and the rest represent an alkyl group having 1 to 3 carbon atoms or a hydroxyl group. R ⁴ represents a residue excluding the terminal amino group of a basic amino acid having an amino group at the terminal of the side chain, and R ⁵ represents R ⁴
Shows side chains of amino acids other than, a is 1 or 3 and m is 0
~ 100, n is 0 to 100, m + n is 1 to 100 (however, m and n only indicate the number of amino acids, not the order of amino acid sequences)], Alternatively, the following general formula (II): [In the formula, at least one of R ¹ , R ² , and R ³ represents a hydroxyl group, and the rest represent an alkyl group having 1 to 3 carbon atoms or a hydroxyl group. R ⁴ represents a residue excluding the terminal amino group of a basic amino acid having an amino group at the terminal of the side chain, and R ⁵ represents R ⁴
Shows side chains of amino acids other than, a is 1 or 3 and m is 0
˜100, n is 0 to 100, and m + n is 1 to 100 (however, m and n only indicate the number of amino acids, not the order of amino acid sequences)]. The surface treatment method for a cellulosic fiber according to claim 1. 3. The surface treatment method for a cellulosic fiber according to claim 1, wherein the peptide portion of the silylated peptide is a hydrolyzed peptide obtained by partially hydrolyzing a protein derived from plants and animals. 4. The surface of the cellulosic fiber according to claim 1, wherein the peptide portion of the silylated peptide is at least one selected from the group consisting of hydrolyzed collagen peptide, hydrolyzed keratin peptide and hydrolyzed fibroin peptide. Processing method. 5. The surface treatment method for a cellulosic fiber according to claim 1, wherein the peptide portion of the silylated peptide is a hydrolyzed fibroin peptide.