Wool fiber hydrophilic treatment process

Abstract

The invention discloses a wool fiber hydrophilic treatment process which is characterized by comprising the following steps: pretreatment: dipping wool loose fibers or wool tops in a pretreatment solution and drying; the pretreatment liquid comprises a hydroxylamine hydrochloride solution, polyoxyethylene sorbitan fatty acid ester, ethanolamine and isopropylenediamine; wool hydrophilic modification refers to soaking the pretreated wool fibers in a hydrophilic modification treatment solution and drying the wool fibers; the hydrophilic modification treatment liquid is prepared from L-cysteine, methionine, nisin and thioamide. In the pretreatment stage, thioester bonds and part of oxygen ester bonds on the surfaces of the wool fibers can be broken through nucleophilic substitution, lipid on the surfaces of the wool fibers is removed, and disulfide bonds can be opened and reconstructed. And the hydrophilic groups are further increased through subsequently used substances such as L-cysteine, so that the hydrophilic effect is improved. And the used nisin can improve the antibacterial effect of the wool fiber.

Description

Technical Field

[0001] The invention relates to a wool fiber hydrophilicity treatment process, belonging to the technical field of wool treatment. Background Art

[0002] Wool fiber is mainly composed of protein (97%), with complex morphology and chemical structure. The fiber structure is divided into three layers: scale layer, cortex and medulla. In addition, wool fiber also contains structural lipids (about 2%) and other compounds (about 1%). The outermost layer of wool is a special scale layer structure. Although this structure only accounts for 10% of the total wool, it brings many problems to the dyeing and finishing of wool and its wearing performance. On the one hand, the existence of the scale layer makes the fiber have a "directional friction effect", which makes the wool prone to felt shrinkage and deformation; on the other hand, there are highly hydrophobic lipid structures in the scale layer, as well as a large number of amide bond cross-linking and disulfide bond lateral cross-linking, which makes the scale layer structure of wool abnormally dense, seriously hindering the spreading and adsorption of various chemical finishing agents on the fiber surface, affecting the hydrophilicity, dyeing, printing and various finishing of wool. At present, the modification methods for wool fibers are mainly divided into physical etching, chemical modification and bio-enzyme erosion. Among them, physical etching such as plasma treatment and ultrasonic treatment can peel off all or part of the scale layer. Chemical modifications such as sodium dichloroisocyanurate and hydrogen peroxide can oxidize disulfide bonds into sulfonic acid groups, or give polar groups to the surface of wool fibers to produce new surface properties. Biological enzymes can partially degrade the peptide bonds of wool keratin, and the number of polar groups on the surface of wool fibers can be used to increase hydrophilicity. Due to the poor controllability of organic halide emissions and damage, high production costs, and poor persistence of hydrophilicity of the prepared wool fibers, how to improve the hydrophilicity of wool fibers while maintaining technicality has become a problem to be solved. Summary of the invention

[0003] The purpose of the invention is to provide a wool fiber hydrophilicity treatment process, which can improve the hydrophilicity of the wool fiber.

[0004] To solve the above technical problems, the purpose of the present invention is achieved as follows:

[0005] The present invention relates to a wool fiber hydrophilic treatment process, characterized by comprising the following steps:

[0006] S1. Pretreatment: refers to the process of dipping wool loose fibers or wool tops into pretreatment liquid at a bath ratio of 1:10-15, dipping at 50℃-70℃ for 45-60min, and drying;

[0007] The pretreatment liquid is a hydroxylamine hydrochloride solution, and the pH value is adjusted to 6-6.5 with sodium hydroxide; the pretreatment liquid also includes polyoxyethylene sorbitan fatty acid ester, ethanolamine and isopropylene diamine;

[0008] S2. Wool hydrophilic modification: refers to the process of dipping the pre-treated wool loose fibers or wool tops into the hydrophilic modification treatment solution at a bath ratio of 1:10-15, and adjusting the pH value to 8-8.5 with ammonia water; dipping for 45-60 minutes at a temperature of 50℃-70℃, and drying;

[0009] The hydrophilic modification treatment solution includes L-cysteine, methionine, nisin and thioamide.

[0010] On the basis of the above scheme and as a preferred scheme of the above scheme: the amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 5-10% of the weight of the wool fiber to be treated.

[0011] On the basis of the above scheme and as a preferred scheme of the above scheme: the hydrophilic modification treatment liquid includes 10-15wt% of L-cysteine, 10-15wt% of methionine, 5-10wt% of nisin and 5-10wt% of thioamide.

[0012] On the basis of the above scheme and as a preferred scheme of the above scheme: the amount of polyoxyethylene sorbitan fatty acid ester in the hydroxylamine hydrochloride solution is 10-15 g / L, the amount of ethanolamine is 4-6 g / L and the amount of isopropylenediamine is 5-10 g / L.

[0013] On the basis of the above scheme and as a preferred scheme of the above scheme: the hydrophilic modification treatment solution also includes silk fibroin and carbodiimide; the amount of the silk fibroin is 5-8wt%, and the amount of carbodiimide is 1-3wt%.

[0014] The beneficial effects of the present invention are as follows: the hydrophilic treatment of wool fibers involved in the present invention can break the thioester bonds and part of the oxygen ester bonds on the surface of the wool fibers by nucleophilic substitution in the pretreatment stage, remove the lipids on the surface, and open and rebuild the disulfide bonds. The hydrophilic groups are further increased by the subsequent use of substances such as L-cysteine, thereby improving the hydrophilic effect. The used nisin can improve the antibacterial effect of wool fibers. DETAILED DESCRIPTION

[0015] The present invention is further described below in conjunction with specific embodiments.

[0016] Embodiment 1

[0017] A wool fiber hydrophilic treatment process involved in this embodiment includes the following steps:

[0018] S1. Pretreatment: refers to immersing wool bulk fiber or wool top in pretreatment liquid at a bath ratio of 1:10-15, immersing at 50℃-70℃ for 45-60min, and drying. The pretreatment liquid is a hydroxylamine hydrochloride solution, and the pH value is adjusted to 6 with sodium hydroxide; the hydroxylamine hydrochloride solution also includes polyoxyethylene sorbitan fatty acid ester, ethanolamine and isopropylene diamine. In this embodiment, carbonized wool bulk fiber is selected.

[0019] Under the action of sodium hydroxide, hydroxylamine hydrochloride can generate free hydroxylamine, which can react with the thioester bonds and oxygen ester bonds on the surface of wool, thereby removing the lipids on its surface, thereby weakening the waterproof performance of wool fibers.

[0020] Furthermore, in this embodiment, the bath ratio is 1:10, the immersion is carried out at 50° C. for 45 minutes, and then the mixture is dried.

[0021] Further, the amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 5-10% of the weight of the treated wool bulk fiber. The amount of polyoxyethylene sorbitan fatty acid ester in the pretreatment solution is 10-15g / L, the amount of ethanolamine is 4-6g / L, and the amount of isopropylene diamine is 5-10g / L. In this embodiment, the amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 5% of the weight of the treated wool fiber. The amount of polyoxyethylene sorbitan fatty acid ester in the hydroxylamine hydrochloride solution is 10g / L, the amount of ethanolamine is 4g / L, and the amount of isopropylene diamine is 10g / L.

[0022] S2. Wool hydrophilic modification: refers to the process of immersing the pretreated wool fiber in a hydrophilic modification treatment solution at a bath ratio of 1:15, and adjusting the pH value to 8.5 with ammonia water; immersing for 60 minutes at 50°C, and drying; the hydrophilic modification treatment solution includes L-cysteine, methionine, nisin and thioamide. The thioamide is specifically 3-thioamide or thioacetamide. The molecular formula of 3-thioamide is C 5 H 5 NS 2 The molecular formula of thioacetamide is C 2 H 5 NS. In this embodiment, thioacetamide is selected. L-cysteine ​​can open the disulfide bonds on the wool fiber, generate new disulfide bonds and introduce polar groups.

[0023] Further, the hydrophilic modification treatment solution includes 10-15wt% of L-cysteine, 10-15wt% of methionine, 5-10wt% of nisin and 5-10wt% of thioamide. In the present embodiment, the hydrophilic modification treatment solution includes 10wt% of L-cysteine, 15wt% of methionine, 10wt% of nisin and 5wt% of thioamide.

[0024] Embodiment 2

[0025] The hydrophilic treatment process of wool fiber involved in this embodiment is characterized by:

[0026] S1. Pretreatment: refers to immersing wool loose fibers or wool tops in a pretreatment solution at a bath ratio of 1:10-15, immersing at a temperature of 50℃-70℃ for 45-60min, and drying. The pretreatment solution is a hydroxylamine hydrochloride solution, and the pH value is adjusted to 6.5 with sodium hydroxide; the hydroxylamine hydrochloride solution also includes polyoxyethylene sorbitan fatty acid ester, ethanolamine and isopropylene diamine. In this embodiment, the wool tops formed by combing carbonized wool are used.

[0027] Under the action of sodium hydroxide, hydroxylamine hydrochloride can generate free hydroxylamine, which can react with the thioester bonds and oxygen ester bonds on the surface of wool, thereby removing the lipids on its surface, thereby weakening the waterproof performance of wool fibers.

[0028] Furthermore, in this embodiment, the bath ratio is 1:15, the immersion is carried out at 45° C. for 60 minutes, and the mixture is dried.

[0029] Further, the amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 5-10% of the weight of the treated wool fiber. The amount of polyoxyethylene sorbitan fatty acid ester in the pretreatment solution is 10-15g / L, the amount of ethanolamine is 4-6g / L, and the amount of isopropylene diamine is 5-10g / L. In this embodiment, the amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 10% of the weight of the treated wool fiber. The amount of polyoxyethylene sorbitan fatty acid ester in the hydroxylamine hydrochloride solution is 5g / L, the amount of ethanolamine is 6g / L, and the amount of isopropylene diamine is 5g / L.

[0030] S2. Wool hydrophilic modification: refers to immersing the pretreated wool fiber in a hydrophilic modification treatment solution at a bath ratio of 1:10, and adjusting the pH value to 8 with ammonia water; immersing at 70°C for 45 minutes, and drying; the hydrophilic modification treatment solution includes L-cysteine, methionine, nisin, thioamide, silk protein and carbodiimide. Thioamide is specifically 3-thioamide or thioacetamide. The molecular formula of 3-thioamide is C 5 H 5NS 2 The molecular formula of thioacetamide is C 2 H 5 NS. In this embodiment, thioacetamide is selected. L-cysteine ​​can open the disulfide bonds on the wool fiber, generate new disulfide bonds and introduce polar groups.

[0031] Further, the hydrophilic modification treatment solution includes 10-15wt% of L-cysteine, 10-15wt% of methionine, 5-10wt% of nisin and 5-10wt% of thioamide. In this embodiment, the hydrophilic modification treatment solution includes 10wt% of L-cysteine, 15wt% of methionine, 10wt% of nisin and 5wt% of thioamide, the amount of silk fibroin is 8wt%, and the amount of carbodiimide is 1wt%.

[0032] The wool fibers and raw wool prepared in Example 1 and Example 2 were prepared into 60-count worsted wool yarn, and the yarn was made into 220 g / m2 wool fabric according to plain weave and the same warp and weft density, and the fabric was tested for hydrophilicity. The water drop spreading time of the test fabric was 1.5s, 1.3s and 3.5s, respectively, which shows that the prepared wool fiber has good hydrophilicity.

[0033] The antibacterial ability of the wool prepared in Example 1 and Example 2 was tested, and compared with the wool washed and carbonized in the comparative example. The antibacterial rates of the wool prepared in Example 1 against Escherichia coli, Staphylococcus aureus and Candida albicans were 95.3%, 91.6% and 92.8% respectively, the antibacterial rates of the wool prepared in Example 1 against Escherichia coli, Staphylococcus aureus and Candida albicans were 93.2%, 90.8% and 92.1% respectively, while the antibacterial rates of the comparative example against Escherichia coli, Staphylococcus aureus and Candida albicans were 75.4%, 72.5% and 70.4% respectively.

[0034] After being washed 100 times, the wool prepared in Example 1 had antibacterial rates of 90.4%, 88.6% and 90.9% against Escherichia coli, Staphylococcus aureus and Candida albicans respectively.

[0035] After being washed 100 times, the wool prepared in Example 2 had antibacterial rates of 88.7%, 87.1% and 85.2% against Escherichia coli, Staphylococcus aureus and Candida albicans respectively.

[0036] The preferred specific embodiments of the present invention are described in detail above. It should be understood that a person skilled in the art can make many modifications and changes based on the concept of the present invention without creative work. Therefore, any technical solution that can be obtained by a person skilled in the art through logical analysis, reasoning or limited experiments based on the concept of the present invention on the basis of the prior art should be within the scope of protection determined by the claims.

Claims

1. A process for treating wool fiber hydrophilicity, characterized in that: The steps include: S1. Pretreatment: refers to the process of dipping wool loose fibers or wool tops into pretreatment liquid at a bath ratio of 1:10-15, dipping at 50℃-70℃ for 45-60min, and drying; The pretreatment liquid is a hydroxylamine hydrochloride solution, and the pH value is adjusted to 6-6.5 with sodium hydroxide; the pretreatment liquid also includes polyoxyethylene sorbitan fatty acid ester, ethanolamine and isopropylene diamine; S2. Wool hydrophilic modification: refers to the process of dipping the pre-treated wool loose fibers or wool tops into the hydrophilic modification treatment solution at a bath ratio of 1:10-15, and adjusting the pH value to 8-8.5 with ammonia water; dipping for 45-60 minutes at a temperature of 50℃-70℃, and drying; The hydrophilic modification treatment solution includes L-cysteine, methionine, nisin and thioamide.

2. A wool fiber hydrophilic treatment process according to claim 1, characterized in that: The amount of hydroxylamine hydrochloride in the hydroxylamine hydrochloride solution is 5-10% of the weight of the wool fiber to be treated.

3. A wool fiber hydrophilic treatment process according to claim 1, characterized in that: The hydrophilic modification treatment liquid comprises 10-15 wt % of L-cysteine, 10-15 wt % of methionine, 5-10 wt % of nisin and 5-10 wt % of thioamide.

4. A wool fiber hydrophilic treatment process according to claim 1, characterized in that: The dosage of polyoxyethylene sorbitan fatty acid ester in the hydroxylamine hydrochloride solution is 10-15 g / L, the dosage of ethanolamine is 4-6 g / L, and the dosage of isopropylenediamine is 5-10 g / L.

5. A wool fiber hydrophilic treatment process according to claim 1, characterized in that: The hydrophilic modification treatment solution further comprises silk fibroin and carbodiimide; the amount of the silk fibroin is 5-8wt%, and the amount of carbodiimide is 1-3wt%.