Sizing yarn, gray fabric and desizing method thereof

Abstract

The invention belongs to the technical field of textile, and relates to a sizing yarn, a gray fabric and a desizing method thereof. The sizing yarn comprises a yarn body and a sizing film covering the surface of the yarn body, the yarn body and the sizing film are connected through an imine bond, the yarn body is the yarn body containing aldehyde groups, the sizing film is formed by cross-linking protein and protein through the imine bond by means of dialdehyde starch, the protein contains amino, the dialdehyde starch contains the aldehyde groups, and the imine bond is formed between the protein and the dialdehyde starch; grey cloth is formed by weaving the sizing yarn; the desizing method comprises the following steps of: immersing the grey cloth into acidic desizing liquid for washing, and performing acid response bond breaking of imine bonds, so as to finish desizing of the grey cloth. Through the innovative sizing yarn design, the preparation method and the desizing method, the problems existing in a traditional sizing technology are effectively solved, and the weaving efficiency, the fabric quality and the environment-friendly performance are improved.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of textiles, and relates to a sizing yarn, a gray cloth and a desizing method thereof. The application is a divisional application of a patent with application number 2025105269192, application date April 25, 2025, and name “a sizing yarn, a gray cloth and a desizing method thereof”. BACKGROUND

[0002] For a long time, fabrics have been the core demand in people's daily life and industrial production, and the continuous optimization and innovation of their production process are particularly important. In the many preparation links of modern weaving production process, the sizing process of warp yarn plays a crucial role and directly affects the production efficiency of the loom. The core purpose of the sizing process is to enhance the strength and wear resistance of the yarn, reduce the harmful hair on the surface of the yarn, thereby reducing the downtime caused by yarn breakage during weaving and improving the production efficiency of the loom.

[0003] However, the traditional sizing materials and techniques gradually show their limitations in meeting the demands of modern weaving. Natural sizing materials, such as starch sizing materials, although low in cost and widely available, have natural defects such as brittle and hard sizing film and poor adhesion, which make it difficult to meet the requirements of high-speed and high-quality weaving. Although the performance of starch sizing materials can be improved to some extent through physical addition of sizing aids and chemical structure modification, the problems of insufficient adhesion and difficult desizing remain serious.

[0004] Synthetic sizing materials, such as polyvinyl alcohol (PVA) and acrylic sizing materials, have improved sizing performance, but the high price, non-biodegradable characteristics, and water resource waste and environmental pollution problems in the desizing process have seriously restricted their widespread application. The compounding sizing material technology (for example, the patent application with publication number CN111335037A and the patent with authorization announcement number CN101831805B) attempts to make up for the shortcomings of single sizing material by introducing multiple ingredients, but the complex preparation process and numerous types of raw materials are also not conducive to large-scale preparation and industrialization.

[0005] Under this background, protein sizing material, as an environmentally friendly and sustainable sizing material, has gradually attracted attention in the industry. Natural protein resources such as soybean protein, keratin, and gelatin have been tried to be applied in textile sizing materials due to their good biocompatibility and degradability. However, the problems of pure protein sizing material, such as brittle and easily broken sizing film, seriously affect the quality of fabrics.

[0006] In order to improve this defect of protein sizing paste, the existing modification methods mainly focus on improving the performance of the sizing film itself, trying to improve the toughness and high temperature resistance of the sizing film through physical plasticization or chemical grafting. The patent application with publication number CN118146463A uses thiol chemical click method to introduce different structure of polymer flexible branch on the molecular chain of protein, prepares keratin-based sizing paste, and improves the toughness of keratin sizing film; the patent with authorization announcement number CN107417939B self-assembles keratin and acid gelatin to increase the molecular weight of protein to improve the toughness of the sizing film. However, these methods are often complex and costly, and do not fundamentally solve the problem of insufficient adhesion between sizing yarn interface. Therefore, how to balance high adhesion and low desizing difficulty while maintaining the environmental advantages of protein sizing paste has become a hot and difficult point in current sizing technology research. SUMMARY

[0007] The purpose of the present application is to solve the problems existing in the prior art and provide a sized yarn, a gray cloth and a desizing method thereof.

[0008] To achieve the above purpose, the technical scheme adopted by the present application is as follows:

[0009] A sized yarn A, comprising a yarn and a sizing film coated on the surface of the yarn, the yarn and the sizing film are connected by a disulfide bond, the sizing film is formed by directly cross-linking a protein with a protein through a disulfide bond, the yarn is a thiol-containing yarn, the protein is a protein treated by thiol enrichment, the protein itself contains thiol, and the thiol enrichment treatment can further increase the number of thiols in the protein.

[0010] As a preferred technical scheme:

[0011] The sized yarn A as described above, the breaking strength of the sizing film is 7.62-16.17 MPa, the elongation at break is 41.3-101.11%, the breaking work is 0.95-5.27 J, the storage modulus at 30°C is 239.275-736.4 MPa, and the loss modulus at 30°C is 82.042-119.014 MPa; the sizing rate of the sized yarn is 15.1-20.93%, and the roving breaking strength is 15.13-22.3 N.

[0012] The sized yarn A as described above, the thiol-containing yarn is a cellulose yarn treated by thiolization.

[0013] The preparation process of the mercapto-containing yarn as described above is as follows: the cellulose yarn is immersed in an L-cysteine solution, ultrasonic treatment is carried out at 20-30 DEG C for 5-10 min, baking is carried out at 160-180 DEG C for 3-5 min, the excess L-cysteine is washed away with water, and then drying is carried out in a vacuum oven, so as to obtain the mercapto-containing yarn, wherein the concentration of the L-cysteine solution is 3-5 wt%, the mass ratio of the cellulose yarn to the L-cysteine solution is 1-1.2:100-200, and the ultrasonic power is 120-180 W.

[0014] The preparation process of the sized yarn A as described above is as follows: 2-iminothiolane is added to a regenerated protein slurry, and incubation is carried out at 25-30 DEG C for 30-50 min to obtain a sizing agent, the sizing agent is coated on the mercapto-containing yarn by padding, and then reaction is carried out in hot air at 60-80 DEG C for 10-20 min, so as to obtain the sized yarn A, wherein the concentration of the regenerated protein in the regenerated protein slurry is 6 wt%, the mass of the 2-iminothiolane is 2-6% of the mass of the regenerated protein, the padding is two-dip-two-pad, the dipping is single roller type, the padding is upper and lower double roller type, the padding pressure is 20-40 N, and the sizing speed is 10-30 m / min.

[0015] The application further provides a grey cloth A which is woven by the sized yarn A as described above.

[0016] The application further provides a desizing method of the grey cloth A as described above, which comprises the following steps: the grey cloth A is immersed in a desizing solution containing a reducing agent, and then a disulfide bond reduction reaction is carried out, so as to complete the desizing of the grey cloth A, wherein the mass ratio of the grey cloth A to the desizing solution containing the reducing agent is 1:10-15, the pH value of the desizing solution containing the reducing agent is 7-9, the concentration of the reducing agent in the desizing solution is 10-20 g / L, the reducing agent is L-cysteine, the washing temperature is 20-50 DEG C, the washing time is 1-10 min, stirring is carried out during the washing, and the desizing rate of the grey cloth A is 95.78-99.43%.

[0017] The application further provides a sized yarn B, which comprises a yarn and a sizing film coated on the surface of the yarn, the yarn and the sizing film are connected by an imine bond, the yarn is an aldehyde group-containing yarn, the sizing film is formed by cross-linking of a protein and a dialdehyde starch by an imine bond, the protein itself contains an amino group, the dialdehyde starch contains an aldehyde group, and the imine bond is formed between the protein and the dialdehyde starch.

[0018] As a preferred technical scheme:

[0019] The sizing yarn B as described above has a sizing film with a breaking strength of 7.62-8.33 MPa, an elongation at break of 92.02-113.85%, a breaking work of 5.27-6.19 J, a storage modulus at 30℃ of 736.4-950 MPa, and a loss modulus at 30℃ of 119.014-150.79 MPa; and the sizing yarn has a sizing rate of 11.75-20.93% and a roving breaking strength of 15.28-125.09 N.

[0020] The sizing yarn B as described above has an aldehyde group-containing yarn that is a cellulose-based yarn treated by an aldehyde group treatment, or a polyester-based yarn treated by a hydroxyl group treatment and an oxidation treatment in sequence.

[0021] The sizing yarn B as described above is prepared by adding a cellulose-based yarn to a sodium periodate solution, treating at 50-60℃ for 3-6 min, taking out, washing with water, and drying to obtain the aldehyde group-containing yarn, wherein the concentration of the sodium periodate solution is 0.3-0.6 wt%, and the mass ratio of the cellulose-based yarn to the sodium periodate solution is 1:100.

[0022] Alternatively, the aldehyde group-containing yarn is prepared by adding a polyester-based yarn to a sodium hydroxide solution, treating at 60-70℃ for 10-20 min, taking out, washing with water, and drying to obtain a hydroxyl group-containing yarn, and then adding the hydroxyl group-containing yarn to a sodium periodate solution, treating at 50-65℃ for 20-30 min, taking out, washing with water, and drying to obtain the aldehyde group-containing yarn, wherein the concentration of the sodium hydroxide solution is 15-20 wt%, the mass ratio of the polyester-based yarn to the sodium hydroxide solution is 1:200-220, the concentration of the sodium periodate solution is 1 wt%, and the mass ratio of the hydroxyl group-containing yarn to the sodium periodate solution is 1:100-120.

[0023] The sizing yarn B as described above is prepared by adding dialdehyde starch to a regenerated protein slurry, adjusting the pH value to 8.13-9.5, and incubating at 70-80℃ for 30-40 min to obtain a sizing agent, coating the sizing agent on the aldehyde group-containing yarn by padding, and reacting in hot air at 60-80℃ for 8-20 min to obtain the sizing yarn B, wherein the concentration of the regenerated protein in the regenerated protein slurry is 6 wt%, and the mass of the dialdehyde starch is 5-20% of the mass of the regenerated protein; the padding is two-dip-two-pad, the dipping is single roller type, the padding is upper and lower double roller type, the padding pressure is 20-40 N, and the sizing speed is 20-30 m / min.

[0024] The application further provides a greige fabric B woven from the sizing yarn B as described above.

[0025] The application further provides a desizing method of the grey cloth B, which is immersed in the acidic desizing solution to break the imine bond in response to the acid, so as to complete the desizing of the grey cloth B, wherein the mass ratio of the grey cloth B to the acidic desizing solution is 1-1.2:20-30; the pH value of the acidic desizing solution is 2-5; the temperature of the washing is 20-60 DEG C, and the time is 5-20 min; the washing is accompanied by stirring; and the desizing rate of the grey cloth B is 88.17-97.53%.

[0026] Advantages:

[0027] (1) The application significantly enhances the adhesion between the yarn and the sizing film by forming a dynamic covalent bond between the yarn and the sizing film, and improves the mechanical properties of the sizing film by using the sizing film formed by directly cross-linking the proteins through the dynamic covalent bond (or the sizing film formed by cross-linking the proteins through the dynamic covalent bond by using a cross-linking agent), so that the sizing yarn is not easy to break and fall off during weaving, the weaving defects are reduced, and the quality of the fabric is improved.

[0028] (2) The sizing yarn preparation method of the application is relatively simple, does not need complex physical plasticization or chemical grafting process, reduces the production cost, and at the same time, by using the renewable resources such as agricultural and livestock wastes as the protein source, not only the effective utilization of resources is realized, but also the environmental pollution is reduced.

[0029] (3) The desizing method of the application not only has a high desizing rate, but also reduces the waste of water resources and environmental pollution, and meets the requirements of sustainable development.

[0030] (4) The application performs thiol group enrichment or dialdehyde starch cross-linking modification on the protein sizing material, forms a more smooth, continuous and uniform surface structure after cross-linking and film forming on the surface of the yarn, such structure is beneficial to enhancing the mechanical properties and wear resistance of the sizing yarn, at the same time, reduces the roughness of the sizing yarn surface, and improves the overall quality of the fabric. BRIEF DESCRIPTION OF DRAWINGS

[0031] Figure 1 SEM images of the surface and section of the sizing yarn; wherein, (a)-(c) are the surface, (d)-(f) are the section, (a) and (d) correspond to example A1, (b) and (e) correspond to example A2, and (c) and (f) correspond to example A3;

[0032] Figure 2 X-ray photoelectron spectroscopy deconvolution analysis diagram of the sulfur element in the sizing film of the sizing yarn; wherein, (a) corresponds to example A1, (b) corresponds to example A2, and (c) corresponds to example A3;

[0033] Figure 3 X-ray photoelectron spectroscopy deconvolution analysis diagram of the carbon element in the sizing film of the sizing yarn of example B5. DETAILED DESCRIPTION

[0034] The application will be further described below in connection with specific embodiments. It should be understood that these embodiments are only used to illustrate the application and not used to limit the scope of the application. Furthermore, it should be understood that after reading the content of the application, those skilled in the art can make various modifications or changes to the application, and these equivalent forms also fall within the scope defined by the appended claims.

[0035] The following are the test methods of the relevant performance indicators in each embodiment:

[0036] Serous membrane breaking strength, elongation at break, breaking work: tested according to GB / T 1040.1-2018 standard.

[0037] Storage modulus, loss modulus at 30℃: tested by DMA-Q800 (TA, US) dynamic mechanical analyzer (using DMA multi-frequency strain mode); wherein, the temperature range is 30-150℃, the frequency is 1Hz, and the heating rate is 5℃ / min.

[0038] Roving breaking strength: tested according to FZ / T 15001-2008 standard.

[0039] Strength: tested according to GB / T 3916-2013 standard.

[0040] Harmful hair root number: tested according to FZ / T 01086-2020 standard.

[0041] The calculation methods of the sizing rate and the desizing rate are as follows:

[0042] The sizing rate is calculated according to the following formula:

[0043]

[0044] In the formula, m0 is the original mass of the thiol-containing yarn / aldehyde-containing yarn, and m1 is the mass of the thiol-containing yarn / aldehyde-containing yarn after sizing;

[0045] The desizing rate is calculated according to the following formula:

[0046]

[0047] In the formula, M0 is the original mass of the fabric woven from the thiol-containing yarn / aldehyde-containing yarn, M1 is the mass of the fabric after sizing, and M2 is the mass of the fabric after desizing.

[0048] Example A1

[0049] A desizing method of a fabric, the specific steps are as follows:

[0050] (1) Preparation of raw materials;

[0051] Cellulose yarn: cotton yarn, manufacturer: Changzhou Liwan Textile Co., Ltd., full cotton ring spinning high-set yarn series, fineness: 32S;

[0052] L-cysteine solution: solvent: water, concentration: 3wt%;

[0053] Regenerated protein slurry: composed of regenerated protein, glycerol and water, concentration of regenerated protein: 6wt%, concentration of glycerol: 1.2wt%; the regenerated protein is feather keratin extracted from duck feather using L-cysteine, urea, water and sodium hydroxide, during the extraction process, the addition amount of L-cysteine is 10wt% of the added mass of duck feather, the addition amount of urea is 480.48wt% of the added mass of duck feather, the addition amount of water is 1000wt% of the added mass of duck feather, and the addition amount of sodium hydroxide is 6.89wt% of the added mass of duck feather;

[0054] 2-iminothiolane;

[0055] Desizing solution containing L-cysteine: composed of L-cysteine, sodium hydroxide and deionized water, pH value in the interval [7, 9], concentration of L-cysteine: 10g / L, concentration of sodium hydroxide: 0.192g / L;

[0056] (2) Preparation of sized yarn;

[0057] (2.1) The cellulose yarn was immersed in the L-cysteine solution, ultrasonically treated at 20℃ for 10min at a power of 120W, then baked at 160℃ for 5min, washed with water to remove excess L-cysteine, and dried to obtain a thiol-containing yarn with a strength of 13.86cN / tex and a harmful hair root number of 74 per 5 meters; wherein the mass ratio of cellulose yarn to L-cysteine solution was 1:100;

[0058] (2.2) 2-iminothiolane was first added to the regenerated protein slurry, and the slurry was obtained by incubating at 25℃ for 30min, then a dip-nip method was used, the dip was single roller type and the nip was double roller type, the pressure was controlled at 20N and the sizing speed was 10m / min, the sizing agent was coated on the thiol-containing yarn, and then the yarn was reacted in hot air at 60℃ for 20min to obtain the sized yarn (SEM as shown in Figs. (a), (d)); Figure 1

[0059] The prepared sized yarn is composed of thiol-containing yarn and sizing film coated on the surface of the thiol-containing yarn (X-ray photoelectron energy spectrum deconvolution analysis of sulfur element in sizing film is as shown in​Figure 2 The group of parallel experiments is shown in (a); in order to ensure the accuracy of the atlas, a group of parallel experiments is needed to prepare the sizing film separately, i.e. in step (2.2), replace the thiol-containing yarn with a polytetrafluoroethylene substrate, and after preparation, remove the substrate to obtain the sizing film) composition, the breaking strength of the sizing film is 16.17 MPa, the elongation at break is 83.6%, the breaking work is 1.82 J, the storage modulus at 30°C is 300.679 MPa, and the loss modulus at 30°C is 110.814 MPa; the sizing rate of the sized yarn is 16%, and the breaking strength of the roving is 20.23 N; the strength improvement rate of the sized yarn relative to the thiol-containing yarn is 20.82%, and the harmful hair root number reduction rate is 94.42%;

[0060] (3) Preparation of gray fabric;

[0061] The sized yarn is woven to obtain a gray fabric;

[0062] (4) Desizing of gray fabric;

[0063] The gray fabric is immersed in a desizing solution containing L-cysteine and washed at 20°C for 10 min to complete the desizing of the gray fabric; wherein the mass ratio of the gray fabric to the desizing solution containing L-cysteine is 1:15.

[0064] The desizing rate of the final gray fabric is 95.78%.

[0065] Example A2

[0066] A desizing method of gray fabric, the specific steps are as follows:

[0067] (1) Preparation of raw materials;

[0068] Cellulose yarn: viscose yarn, manufacturer is Hangzhou Huichuang Textile Co., Ltd., cotton ring spinning series, fineness is 32S;

[0069] L-cysteine solution: solvent is water, concentration is 4wt%;

[0070] Regenerated protein sizing solution: composed of regenerated protein, glycerol and water, the concentration of regenerated protein is 6wt%, the concentration of glycerol is 1.2wt%; the regenerated protein is feather keratin extracted from duck feather using L-cysteine, urea, water and sodium hydroxide, during the extraction process, the addition amount of L-cysteine is 10wt% of the added mass of duck feather, the addition amount of urea is 480.48wt% of the added mass of duck feather, the addition amount of water is 1000wt% of the added mass of duck feather, and the addition amount of sodium hydroxide is 6.89wt% of the added mass of duck feather;

[0071] 2-iminothiolane;

[0072] Desizing solution containing L-cysteine: composed of L-cysteine, sodium hydroxide and deionized water, pH value in the interval [7, 9], the concentration of L-cysteine is 15 g / L, the concentration of sodium hydroxide is 0.200 g / L;

[0073] (2) preparing the sized yarn;

[0074] (2.1) immersing the cellulose-based yarn in the L-cysteine solution, ultrasonic treatment at 25℃ for 10 min with a power of 160W, baking at 170℃ for 4 min, washing the excess L-cysteine with water, and drying to obtain the thiol-containing yarn with a strength of 15.05 cN / tex and a harmful hair number of 38 roots / 5 meters; wherein the mass ratio of the cellulose-based yarn to the L-cysteine solution is 1:150;

[0075] (2.2) adding 2-iminothiolane to the regenerated protein sizing solution, incubating at 30℃ for 40 min to obtain the sizing agent, using the dip-nip method (dipping is single roller type and nipping is upper and lower double roller type) and controlling the pressure of 40N and the sizing speed of 20 m / min to coat the sizing agent on the thiol-containing yarn, and then reacting in hot air at 70℃ for 10 min to obtain the sized yarn (SEM as shown in Figure 1 (b), (e));

[0076] The prepared sized yarn is composed of the thiol-containing yarn and the sizing film (X-ray photoelectron spectroscopy deconvolution analysis of sulfur element in the sizing film as shown in Figure 2 (b)); in order to ensure the accuracy of the spectrum, a set of parallel experiments are needed to prepare the sizing film separately, i.e. replacing the thiol-containing yarn with a polytetrafluoroethylene substrate in step (2.2), and removing the substrate after preparation to obtain the sizing film); the breaking strength of the sizing film is 11.79 MPa, the elongation at break is 80.35%, the breaking work is 1.38 J, the storage modulus at 30℃ is 251.160 MPa, and the loss modulus at 30℃ is 92.233 MPa; the sizing rate of the sized yarn is 15.1%, and the roving breaking strength is 17.73 N; the strength improvement rate of the sized yarn relative to the thiol-containing yarn is 20.16%, and the harmful hair number reduction rate is 85.74%;

[0077] (3) preparing the gray fabric;

[0078] Weaving the sized yarn to obtain the gray fabric;

[0079] (4) desizing the gray fabric;

[0080] The desizing of the grey cloth is completed by immersing the grey cloth in the desizing solution containing L-cysteine and washing for 5 min at 35℃; wherein the mass ratio of the grey cloth to the desizing solution containing L-cysteine is 1:15.

[0081] The desizing rate of the final grey cloth is 99.43%.

[0082] Example A3

[0083] A desizing method of a grey cloth, the specific steps are as follows:

[0084] (1) Preparation of raw materials;

[0085] Cellulose yarn: cotton yarn, manufacturer is Changzhou Liwan Textile Co., Ltd., full cotton ring spinning high yarn series, fineness is 21S;

[0086] L-cysteine solution: solvent is water, concentration is 5wt%;

[0087] Regenerated protein slurry: composed of regenerated protein, glycerol and water, the concentration of regenerated protein is 6wt%, the concentration of glycerol is 1.2wt%; the regenerated protein is feather keratin extracted from duck feather by using L-cysteine, urea, water and sodium hydroxide, in the extraction process, the addition amount of L-cysteine is 10wt% of the added mass of duck feather, the addition amount of urea is 480.48wt% of the added mass of duck feather, the addition amount of water is 1000wt% of the added mass of duck feather, and the addition amount of sodium hydroxide is 6.89wt% of the added mass of duck feather;

[0088] 2-iminothiolane;

[0089] Desizing solution containing L-cysteine: composed of L-cysteine, sodium hydroxide and deionized water, the pH value is in the interval [7, 9], the concentration of L-cysteine is 20g / L, and the concentration of sodium hydroxide is 0.210g / L;

[0090] (2) Preparation of sized yarn;

[0091] (2.1) The cellulose yarn is immersed in the L-cysteine solution, ultrasonic treated at 30℃ for 5 min with a power of 180W, then baked at 180℃ for 3 min, washed with water to remove excess L-cysteine, and dried to obtain a thiol-containing yarn with a strength of 27.92cN / tex and a harmful hair root number of 25 per 5 meters; wherein the mass ratio of the cellulose yarn to the L-cysteine solution is 1.2:200;

[0092] (2.2) First, add 2-iminothiolane to the regenerated protein slurry, incubate at 30℃ for 50 min to obtain a sizing agent, then use the dipping and padding method of double dipping and double padding (single roller dipping and double roller padding), control the padding force to be 40 N and the sizing machine speed to be 30 m / min, coat the sizing agent on the thiol-containing yarn, and then react in hot air at 80℃ for 10 min to obtain the sized yarn (SEM as shown in Figure 1 Fig. 2 (c), (f); wherein the mass of 2-iminothiolane is 2% of the mass of the regenerated protein;

[0093] The prepared sized yarn is composed of thiol-containing yarn and sizing film coated on the surface of the thiol-containing yarn (X-ray photoelectron energy spectrum deconvolution analysis of sulfur element in the sizing film as shown in Figure 2 Fig. 2 (c); in order to ensure the accuracy of the spectrum, a set of parallel experiments are needed to prepare the sizing film separately, that is, in step (2.2), replace the thiol-containing yarn with a polytetrafluoroethylene substrate, and after preparation, remove the substrate to obtain the sizing film); the breaking strength of the sizing film is 8.65 MPa, the elongation at break is 41.3%, the breaking work is 0.95 J, the storage modulus at 30℃ is 239.275 MPa, and the loss modulus at 30℃ is 82.042 MPa; the sizing rate of the sized yarn is 15.5%, and the roving breaking strength is 15.13 N; the strength improvement rate of the sized yarn relative to the thiol-containing yarn is 11.86%, and the harmful hair number reduction rate is 81.18%;

[0094] (3) Preparation of the gray fabric;

[0095] Weaving the sized yarn to obtain the gray fabric;

[0096] (4) Desizing of the gray fabric;

[0097] Immersion of the gray fabric in the desizing solution containing L-cysteine, washing at 50℃ for 1 min to complete the desizing of the gray fabric; wherein the mass ratio of the gray fabric to the desizing solution containing L-cysteine is 1:10.

[0098] The desizing rate of the final gray fabric is 99.23%.

[0099] Example B1

[0100] A desizing method of a gray fabric, the specific steps are as follows:

[0101] (1) Preparation of raw materials;

[0102] Cellulose yarn: cotton yarn, manufacturer is Changzhou Liwan Textile Co., Ltd., full cotton ring spinning high matching yarn series, fineness is 32S;

[0103] Sodium periodate solution: solvent is water, concentration is 0.3wt%;

[0104] Regenerated protein slurry: composed of regenerated protein (soybean protein isolate, manufacturer is Shandong Yuwang Biological Technology Co., Ltd., model is SD-200), water and glycerol, the concentration of regenerated protein is 6wt%, and the concentration of glycerol is 1.2wt%;

[0105] Dialdehyde starch: CAS number is 9047-50-1;

[0106] Acid desizing solution: hydrochloric acid aqueous solution, pH value is 5.0;

[0107] (2) Preparation of sized yarn;

[0108] (2.1) The cellulose yarn was added into sodium periodate solution, treated at 60℃ for 3min, taken out, washed with water, and dried to obtain the aldehyde group-containing yarn with a strength of 13.71 cN / tex and a harmful hair root number of 72 roots / 5 meters; wherein the mass ratio of cellulose yarn to sodium periodate solution was 1:100;

[0109] (2.2) Dialdehyde starch was first added into the regenerated protein slurry, and the pH value was adjusted to 8.13, and the slurry was incubated at 70℃ for 30min to obtain a sizing agent, then a dip-nip method (dipping is single roller type, and nipping is upper and lower double roller type) was adopted, and the sizing force was controlled to be 20N and the sizing speed was controlled to be 20m / min, and the sizing agent was coated on the aldehyde group-containing yarn, and then the yarn was reacted in hot air at 80℃ for 20min to obtain the sized yarn; wherein the mass of dialdehyde starch was 5% of the mass of regenerated protein;

[0110] The prepared sized yarn was composed of the aldehyde group-containing yarn and the sizing film coated on the surface of the aldehyde group-containing yarn, and the breaking strength of the sizing film was 7.62MPa, the breaking elongation was 101.11%, the breaking work was 5.27J, the storage modulus at 30℃ was 736.4MPa, and the loss modulus at 30℃ was 119.014MPa; the sizing rate of the sized yarn was 20.93%, and the roving breaking strength was 22.3N; the strength improvement rate of the sized yarn relative to the aldehyde group-containing yarn was 26.86%, and the harmful hair root number reduction rate was 99.3%;

[0111] (3) Preparation of gray cloth;

[0112] The sized yarn was woven to obtain the gray cloth;

[0113] (4) Desizing of gray cloth;

[0114] The gray cloth was immersed into the acid desizing solution, washed (with stirring) at 20℃ for 20min, and then the desizing of the gray cloth was completed; wherein the mass ratio of the gray cloth to the acid desizing solution was 1:30.

[0115] The desizing rate of the final gray cloth was 89.47%.

[0116] Example B2

[0117] A desizing method of a greige fabric, the specific steps are as follows:

[0118] (1) Preparation of raw materials;

[0119] Cellulose yarn: viscose yarn, manufacturer is Hangzhou Huichuang Textile Co., Ltd., cotton ring spinning series, fineness is 32S;

[0120] Sodium periodate solution: solvent is water, concentration is 0.4wt%;

[0121] Regenerated protein sizing agent: composed of soybean protein isolate (manufacturer is Shandong Yuwang Biological Technology Co., Ltd., model is SD-200), water and glycerol, the concentration of soybean protein isolate is 6wt%, the concentration of glycerol is 1.2wt%;

[0122] Dialdehyde starch: CAS number is 9047-50-1;

[0123] Acid desizing solution: hydrochloric acid aqueous solution, pH value is 4.0;

[0124] (2) Preparation of sized yarn;

[0125] (2.1) The cellulose yarn is added to the sodium periodate solution, treated at 50℃ for 3min, taken out, washed with water, and dried to obtain an aldehyde group-containing yarn with a strength of 14.97cN / tex and a harmful hair root number of 36 per 5 meters; wherein the mass ratio of the cellulose yarn to the sodium periodate solution is 1:100;

[0126] (2.2) Dialdehyde starch is first added to the regenerated protein sizing agent, and the pH value is adjusted to 9.26, and the sizing agent is obtained by incubating at 80℃ for 40min, then the dipping and padding method of double-dipping and double-padding (dipping is single roller type, padding is upper and lower double roller type) is adopted, and the sizing agent is coated on the aldehyde group-containing yarn by controlling the pressure of 40N and the sizing speed of 30m / min, and then the sizing agent is reacted in hot air at 60℃ for 15min to obtain the sized yarn; wherein the mass of the dialdehyde starch is 10% of the mass of the regenerated protein;

[0127] The prepared sized yarn is composed of the aldehyde group-containing yarn and the sizing film coated on the surface of the aldehyde group-containing yarn, the breaking strength of the sizing film is 8.12MPa, the breaking elongation is 113.85%, the breaking work is 5.86J, the storage modulus at 30℃ is 812.3MPa, and the loss modulus at 30℃ is 141.54MPa; the sizing rate of the sized yarn is 15.32%, the roving breaking strength is 23.766N; the strength improvement rate of the sized yarn relative to the aldehyde group-containing yarn is 31.64%, and the harmful hair root reduction rate is 94.35%.

[0128] (3) preparing the grey cloth;

[0129] weaving the sized yarn to obtain the grey cloth;

[0130] (4) desizing the grey cloth;

[0131] immersing the grey cloth into the acidic desizing solution and washing (with stirring) at 40 °C for 15 min to complete the desizing of the grey cloth; wherein the mass ratio of the grey cloth to the acidic desizing solution is 1:20.

[0132] The desizing rate of the final grey cloth is 88.17%.

[0133] Example B3

[0134] A desizing method of a grey cloth, the specific steps are as follows:

[0135] (1) preparation of raw materials;

[0136] cellulose yarn: cotton yarn, manufacturer is Changzhou Liwan Textile Co., Ltd., full cotton ring spinning high matching yarn series, fineness is 21S;

[0137] sodium periodate solution: solvent is water, concentration is 0.6wt%;

[0138] regenerated protein sizing solution: composed of soybean protein isolate (manufacturer is Shandong Yuyang Biological Technology Co., Ltd., model is SD-200), water and glycerol, the concentration of soybean protein isolate is 6wt%, the concentration of glycerol is 1.2wt%;

[0139] dialdehyde starch: CAS number is 9047-50-1;

[0140] acidic desizing solution: hydrochloric acid aqueous solution, pH value is 3.0;

[0141] (2) preparing the sized yarn;

[0142] (2.1) adding the cellulose yarn into the sodium periodate solution, treating at 50 °C for 6 min, taking out, washing with water, drying to obtain the aldehyde group-containing yarn with a strength of 27.64 cN / tex and a harmful hair root number of 23 roots / 5 meters; wherein the mass ratio of the cellulose yarn to the sodium periodate solution is 1:100;

[0143] (2.2) First, add dialdehyde starch to the regenerated protein slurry, adjust the pH value to 9.5, and incubate at 80℃ for 40 min to obtain a sizing agent, then use the dipping-pad method (the dipping is single roller type and the padding is double roller type), control the pressure of 40 N and the sizing speed of 30 m / min, coat the sizing agent on the yarn containing aldehyde groups, and then react in hot air at 60℃ for 15 min to obtain the sized yarn; wherein the mass of dialdehyde starch is 20% of the mass of regenerated protein;

[0144] The prepared sized yarn is composed of the yarn containing aldehyde groups and the sizing film coated on the surface of the yarn containing aldehyde groups, the breaking strength of the sizing film is 8.33 MPa, the breaking elongation is 92.02%, the breaking work is 6.10 J, the storage modulus at 30℃ is 950 MPa, and the loss modulus at 30℃ is 150.79 MPa; the sizing rate of the sized yarn is 16.52%, and the breaking strength of the roving is 15.28 N; the strength improvement rate of the sized yarn relative to the yarn containing aldehyde groups is 26.6%, and the harmful hair number reduction rate is 97.31%;

[0145] (3) Preparation of the grey cloth;

[0146] The sized yarn is woven to obtain the grey cloth;

[0147] (4) Desizing of the grey cloth;

[0148] The grey cloth is immersed in the acid desizing solution and washed (with stirring) at 60℃ for 5 min to complete the desizing of the grey cloth; wherein the mass ratio of the grey cloth to the acid desizing solution is 1:10.

[0149] The desizing rate of the final grey cloth is 92.5%.

[0150] Example B4

[0151] A desizing method of a grey cloth, the specific steps are as follows:

[0152] (1) Preparation of raw materials;

[0153] Polyester yarn: polyester yarn, manufacturer is Hangzhou Huichuang Textile Co., Ltd., polyester yarn ring spinning series, fineness is 40S;

[0154] Sodium hydroxide solution: solvent is water, concentration is 15wt%;

[0155] Sodium periodate solution: solvent is water, concentration is 1wt%;

[0156] Regenerated protein slurry: composed of soybean protein isolate (manufacturer is Shandong Yuwang Biological Technology Co., Ltd., model is SD-200), water and glycerol, the concentration of soybean protein isolate is 6wt%, and the concentration of glycerol is 1.2wt%;

[0157] Dialdehyde starch: CAS No. 9047-50-1;

[0158] Acid desizing solution: hydrochloric acid aqueous solution, pH value is 5.0;

[0159] (2) Preparation of sized yarn;

[0160] (2.1) The polyester yarn was added into sodium hydroxide solution, treated at 60℃ for 20 min, taken out, washed with water, dried, to obtain the hydroxyl-containing yarn, then the hydroxyl-containing yarn was added into sodium metaperiodate solution, treated at 50℃ for 30 min, taken out, washed with water, dried, to obtain the aldehyde group-containing yarn with the strength of 30.83 cN / tex and the harmful hair number of 28 per 5 meters; wherein the mass ratio of polyester yarn to sodium hydroxide solution was 1:200, and the mass ratio of hydroxyl-containing yarn to sodium metaperiodate solution was 1:100;

[0161] (2.2) Dialdehyde starch was added into the regenerated protein sizing solution, and the pH value was adjusted to 8.26, to obtain a sizing agent after incubation at 70℃ for 40 min, then the sizing agent was coated on the aldehyde group-containing yarn by using dip-nip method (dipping sizing was single roller type, and nipping sizing was double roller type), while the pressure was controlled at 20 N and the sizing speed was controlled at 30 m / min, and then the yarn was reacted in hot air at 80℃ for 8 min, to obtain the sized yarn; wherein the mass of dialdehyde starch was 5% of the mass of regenerated protein;

[0162] The prepared sized yarn was composed of the aldehyde group-containing yarn and the sizing film coated on the surface of the aldehyde group-containing yarn, and the breaking strength of the sizing film was 7.62 MPa, the breaking elongation was 101.11%, the breaking work was 5.27 J, the storage modulus at 30℃ was 736.4 MPa, and the loss modulus at 30℃ was 119.014 MPa; the sizing rate of the sized yarn was 13.44%, and the roving breaking strength was 114.6 N; the strength improvement rate of the sized yarn relative to the aldehyde group-containing yarn was 13.63%, and the harmful hair reduction rate was 94.95%;

[0163] (3) Preparation of grey cloth;

[0164] The sized yarn was woven to obtain the grey cloth;

[0165] (4) Desizing of grey cloth;

[0166] The grey cloth was immersed in the acid desizing solution, washed (with stirring) at 50℃ for 10 min, to complete the desizing of the grey cloth; wherein the mass ratio of the grey cloth to the acid desizing solution was 1:10.

[0167] The desizing rate of the final grey cloth was 95.42%.

[0168] Example B5

[0169] A desizing method of greige cloth, the specific steps are as follows:

[0170] (1) Preparation of raw materials;

[0171] Polyester yarn: polyester yarn, manufacturer is Hangzhou Huichuang Textile Co., Ltd., polyester yarn ring spinning series, fineness is 40S;

[0172] Sodium hydroxide solution: solvent is water, concentration is 15wt%;

[0173] Sodium periodate solution: solvent is water, concentration is 1wt%;

[0174] Regenerated protein sizing agent: composed of soybean protein isolate (manufacturer is Shandong Yuwang Biological Technology Co., Ltd., model is SD-200), water and glycerol, the concentration of soybean protein isolate is 6wt%, the concentration of glycerol is 1.2wt%;

[0175] Dialdehyde starch: CAS number is 9047-50-1;

[0176] Acid desizing solution: hydrochloric acid aqueous solution, pH value is 4.0;

[0177] (2) Preparation of sized yarn;

[0178] (2.1) The polyester yarn is added into the sodium hydroxide solution, treated at 60℃ for 20min, taken out, washed with water, dried, to obtain the hydroxyl-containing yarn, then the hydroxyl-containing yarn is added into the sodium periodate solution, treated at 60℃ for 20min, taken out, washed with water, dried, to obtain the aldehyde group-containing yarn with a strength of 33.83cN / tex and harmful hair number of 28 roots / 5 meters; wherein the mass ratio of polyester yarn to sodium hydroxide solution is 1:200, and the mass ratio of hydroxyl-containing yarn to sodium periodate solution is 1.2:120;

[0179] (2.2) First, dialdehyde starch is added into the regenerated protein sizing agent, and the pH value is adjusted to 9, to obtain a sizing agent after incubation at 70℃ for 40min, then the dipping and padding method of double-dipping and double-padding (dipping is single roller type, padding is upper and lower double roller type) is adopted, and the sizing force is controlled to be 40N and the sizing speed is controlled to be 20m / min, to coat the sizing agent on the aldehyde group-containing yarn, then the sizing agent is reacted in hot air at 70℃ for 12min, to obtain the sized yarn; wherein the mass of dialdehyde starch is 10% of the mass of regenerated protein;

[0180] The prepared sized yarn is composed of the aldehyde group-containing yarn and the sizing film coated on the surface of the aldehyde group-containing yarn (X-ray photoelectron energy spectrum deconvolution analysis of carbon element in the sizing film is as follows: Figure 3The shown; in order to ensure the accuracy of the atlas, a set of parallel experiments need to be prepared independently, that is, in step (2.2), replace the thiol-containing yarn with a polytetrafluoroethylene base material, remove the base material after preparation to obtain the sizing film) group, the breaking strength of the sizing film is 8.12 MPa, the elongation at break is 113.85%, the breaking work is 6.19 J, the storage modulus at 30°C is 812.3 MPa, and the loss modulus at 30°C is 141.540 MPa; the sizing rate of the sized yarn is 12.2%, and the breaking strength of the roving is 125.09 N; the strength improvement rate of the sized yarn relative to the aldehyde-containing yarn is 16.1%, and the harmful hair root number reduction rate is 98.75%;

[0181] (3) Preparation of gray fabric;

[0182] The sized yarn is woven to obtain a gray fabric;

[0183] (4) Desizing of gray fabric;

[0184] The gray fabric is immersed in an acidic desizing solution and washed (with stirring) at 20°C for 20 min, and the desizing of the gray fabric is completed; wherein the mass ratio of the gray fabric to the acidic desizing solution is 1:20.

[0185] The final gray fabric has a desizing rate of 94.31%.

[0186] Example B6

[0187] A desizing method of a gray fabric, the specific steps are as follows:

[0188] (1) Preparation of raw materials;

[0189] Polyester yarn: polyester yarn, manufacturer: Hangzhou Huichuang Textile Co., Ltd., polyester yarn ring spinning series, fineness 40S;

[0190] Sodium hydroxide solution: solvent is water, concentration is 20wt%;

[0191] Sodium periodate solution: solvent is water, concentration is 1wt%;

[0192] Regenerated protein sizing solution: composed of soybean protein isolate (manufacturer: Shandong Yuwang Biological Technology Co., Ltd., model: SD-200), water and glycerol, the concentration of soybean protein isolate is 6wt%, and the concentration of glycerol is 1.2wt%;

[0193] Dialdehyde starch: CAS number is 9047-50-1;

[0194] Acidic desizing solution: hydrochloric acid aqueous solution, pH value is 2.0;

[0195] (2) Preparation of sized yarn;

[0196] (2.1) the polyester yarn is added into sodium hydroxide solution, treated at 70°C for 10 min, taken out, washed with water, dried, to obtain the hydroxyl-containing yarn, then the hydroxyl-containing yarn is added into sodium periodate solution, treated at 65°C for 20 min, taken out, washed with water, dried, to obtain the aldehyde group-containing yarn with strength of 34.74 cN / tex and harmful hair number of 31 per 5 meters; wherein the mass ratio of the polyester yarn to the sodium hydroxide solution is 1:220, and the mass ratio of the hydroxyl-containing yarn to the sodium periodate solution is 1:120;

[0197] (2.2) first, dialdehyde starch is added into the regenerated protein slurry, and the pH value is adjusted to 9, to obtain the sizing agent by incubating at 80°C for 30 min, then the dip-nip method (dipping is single roller type, and nipping is upper and lower double roller type) is adopted, and the sizing agent is coated on the aldehyde group-containing yarn by controlling the pressure of 40 N and the sizing speed of 20 m / min, and then the reaction is carried out in hot air at 60°C for 12 min, to obtain the sized yarn; wherein the mass of the dialdehyde starch is 20% of the mass of the regenerated protein;

[0198] The prepared sized yarn is composed of the aldehyde group-containing yarn and the sizing film coated on the surface of the aldehyde group-containing yarn, and the breaking strength of the sizing film is 8.33 MPa, the breaking elongation is 92.02%, the breaking work is 6.12 J, the storage modulus at 30°C is 950 MPa, and the loss modulus at 30°C is 141.029 MPa; the sizing rate of the sized yarn is 11.75%, and the roving breaking strength is 118.57 N; the strength improvement rate of the sized yarn relative to the aldehyde group-containing yarn is 11.62%, and the harmful hair reduction rate is 98.75%;

[0199] (3) preparing the grey cloth;

[0200] The sized yarn is woven to obtain the grey cloth;

[0201] (4) desizing of the grey cloth;

[0202] The grey cloth is immersed into the acid desizing solution, washed (with stirring) at 40°C for 15 min, to complete the desizing of the grey cloth; wherein the mass ratio of the grey cloth to the acid desizing solution is 1.2:20.

[0203] The desizing rate of the final grey cloth is 97.53%.

Claims

1. A sized yarn comprising a yarn and a size film coated on the surface of the yarn, characterized in that, The yarn and the size film are connected by imine bond, the yarn is aldehyde group-containing yarn, the size film is formed by cross-linking of protein and protein with dialdehyde starch by imine bond, the protein itself contains amino group, the dialdehyde starch contains aldehyde group, and the imine bond is formed between the protein and the dialdehyde starch.

2. A sized yarn according to claim 1, characterized in that The size film has a breaking strength of 7.62-8.33 MPa, an elongation at break of 92.02-113.85%, a breaking work of 5.27-6.19 J, a storage modulus at 30 DEG C of 736.4-950 MPa, and a loss modulus at 30 DEG C of 119.014-150.79 MPa; and the sized yarn has a sizing rate of 11.75-20.93%, and a roving breaking strength of 15.28-125.09 N.

3. A sized yarn according to claim 1, wherein, The aldehyde group-containing yarn is cellulose yarn treated by aldehyde group treatment, or polyester yarn treated by hydroxyl group treatment and oxidation treatment in sequence.

4. A sized yarn according to claim 3, wherein, The preparation process of the aldehyde group-containing yarn is that cellulose yarn is added into sodium metaperiodate solution, treated at 50-60 DEG C for 3-6 min, taken out, washed with water, and dried, to obtain the aldehyde group-containing yarn, wherein the concentration of the sodium metaperiodate solution is 0.3-0.6 wt%, and the mass ratio of the cellulose yarn to the sodium metaperiodate solution is 1:100; Alternatively, the preparation process of the aldehyde group-containing yarn is that polyester yarn is added into sodium hydroxide solution, treated at 60-70 DEG C for 10-20 min, taken out, washed with water, and dried, to obtain the hydroxyl group-containing yarn, and then the hydroxyl group-containing yarn is added into sodium metaperiodate solution, treated at 50-65 DEG C for 20-30 min, taken out, washed with water, and dried, to obtain the aldehyde group-containing yarn, wherein the concentration of the sodium hydroxide solution is 15-20 wt%, the mass ratio of the polyester yarn to the sodium hydroxide solution is 1:200-220, the concentration of the sodium metaperiodate solution is 1 wt%, and the mass ratio of the hydroxyl group-containing yarn to the sodium metaperiodate solution is 1:100-120.

5. A sized yarn according to claim 3, wherein, The preparation process of the sized yarn is that dialdehyde starch is added into regenerated protein sizing solution, and the pH value is adjusted to 8.13-9.5, to obtain sizing agent after heat preservation at 70-80 DEG C for 30-40 min, the sizing agent is coated on the aldehyde group-containing yarn by padding, and then the yarn is reacted in hot air at 60-80 DEG C for 8-20 min, to obtain the sized yarn, wherein the concentration of the regenerated protein in the regenerated protein sizing solution is 6 wt%, the mass of the dialdehyde starch is 5-20% of the mass of the regenerated protein, the padding is two-dip-two-pad, the dipping is single roller type, the padding is upper and lower double roller type, the pressure is 20-40 N, and the sizing speed is 20-30 m / min.

6. A greige goods characterized by, The sized yarn is woven from the sized yarn according to any one of claims 1-5.

7. A desizing method of greige fabric according to claim 6, wherein The grey fabric is washed in acid desizing solution to break the imine bond in acid response, to complete the desizing of the grey fabric, wherein the mass ratio of the grey fabric to the acid desizing solution is 1-1.2:20-30, the pH value of the acid desizing solution is 2-5, the washing temperature is 20-60 DEG C, and the washing time is 5-20 min; The washing is accompanied by stirring, and the desizing rate of the grey fabric is 88.17-97.53%.

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