Shrink-proof finishing method for low strength loss of wool fabric
Technical Field
The invention relates to a shrink-proof finishing method for low strength loss of wool fabric, belonging to the technical field of dyeing and finishing of wool fabric.
Background
Wool is a natural protein fiber, and is highly popular with consumers due to the characteristics of softness, heat preservation, stiffness and low possibility of being stained. However, due to the structural particularity of wool, namely, the surface of the fiber is provided with the scale layer, when the wool is rubbed, the friction resistance in the direction opposite to the scale is larger than that in the direction along the scale, so that the directional friction effect is generated; in addition, the wool has excellent elasticity and crimpability, so that the wool fabric can generate felting phenomenon due to the action of external force in the washing process, the style and the dimensional stability of the fabric are influenced, the hand feeling of the wool fabric becomes rough, and the wearability is obviously reduced.
In order to effectively improve the anti-felting performance of wool, a large number of documents report various modification researches for wool at home and abroad, and the basic principle of the research is how to reduce the directional friction effect. At present, the shrink-proof finishing method for wool fabric can be divided into subtraction method and addition method. Among them, the subtraction process based on chlorination technique has better anti-felting effect, and the common chlorination technique reagents in the current industrial production include NaClO and DCCA (dichloroisocyanurate). In a solution with a proper pH value, the compounds can be converted into HClO to promote the scale layer to be oxidized and hydrolyzed, so that the scale layer is damaged to prevent shrinkage. However, the cortex of wool fibers also contains a large amount of cystine (-S-S-) and tyrosine residues, which can react with HClO like scales, resulting in the destruction of the fur-like layer of wool, and the deterioration of the physical and mechanical properties of wool. Besides chlorination-process anti-felting finishing, various oxidants such as potassium permanganate and hydrogen peroxide are also used for wool anti-felting, but the problems of great fabric strength damage after finishing exist.
The addition anti-felting process mainly applies various polymers to the surface of wool, so that on one hand, the effects of covering a wool scale layer and reducing the directional friction effect are achieved; on the other hand, the fibers are bonded together by the polymer film and cannot move freely, so that the anti-felting effect is obtained. The additive anti-felting treatment applies the polymer on the fiber surface by padding or dipping and solidifies to form a film, often forms a thicker coating on the fiber surface, seriously influences the hand feeling of wool, and has certain influence on the style, anti-contamination property, waterproofness, color and the like of wool fabric.
Disclosure of Invention
[ problem ] to
Solves the problem of great strength damage of the finished fabric in the chlorination shrink-proof processing.
[ solution ]
The invention provides a low-strength-loss anti-felting finishing process for wool fabrics based on self-assembly chitosan-cellulose nanocrystal combined reinforcement, and aims to improve the anti-felting performance of the wool fabrics, reduce the strength damage to the fabrics and improve the hand feeling and the wetting performance of the fabrics.
Specifically, the invention provides a shrink-proof finishing method for low strength loss of wool fabric, which comprises the following steps:
soaking the wool fabric or the wool fiber after chlorination felt proofing treatment in 5-10g/L chitosan finishing liquid for 1-5min, then washing the wool fabric or the wool fiber with water, soaking in 1-5g/L cellulose nanocrystalline solution for 1-5min, then washing the wool fabric or the wool fiber with water, then sequentially repeating the processes of soaking in the chitosan finishing liquid and the cellulose nanocrystalline solution respectively, repeating the self-assembly procedure for 10-20 times, taking out, washing the wool fabric or the wool fiber with water, and drying.
In one embodiment of the invention, the wool fabric or wool fiber is immersed in the chitosan finishing liquor or the cellulose nanocrystal solution at a bath ratio of 1:25 to 1: 50.
In one embodiment of the invention, the chlorination felting prevention treatment method comprises the following steps: placing the wool fabric or the wool fiber in a chlorination solution containing 1-5wt% of Dichloroisocyanurate (DCCA) and 1-3g/L of penetrating agent JFC, performing chlorination treatment at room temperature for 20-40min, placing the wool fabric or the wool fiber in a reducing agent solution with the concentration of 4-8 wt% for dechlorination at 30-50 ℃ for 10-30min, and finally placing the wool fabric in an alkaline solution with the pH value of 8-9, and performing neutralization at 30-50 ℃ for 10-30 min.
In one embodiment of the present invention, the chlorination solution has a pH of 3 to 6.
In one embodiment of the invention, in the chlorination anti-felting treatment, the bath ratio in the chlorination, dechlorination or neutralization process is 1: 25-1:50.
In one embodiment of the invention, the chlorinated solution is preferably treated with DCCA at a concentration of 3 wt% and the penetrant JFC at 1g/L at pH 4 for 20-40min at room temperature.
In one embodiment of the invention, the reducing agent is NaHSO3And reducing agents such as sodium sulfite and sodium dithionite, and the concentration of the reducing agent is preferably 6 wt%.
In one embodiment of the present invention, the alkaline solution is one or more of a sodium bicarbonate solution, a sodium carbonate solution, a sodium hydroxide solution or a sodium citrate solution.
In one embodiment of the invention, the chitosan finish has a pH of 5 to 6.
In one embodiment of the invention, the concentration of chitosan in the chitosan finishing liquor is preferably 5 g/L.
In one embodiment of the present invention, the concentration of the cellulose nanocrystal solution is preferably 2 g/L.
In one embodiment of the present invention, the cellulose nanocrystals have a length of 50 to 200nm and a diameter of 5 to 20 nm.
In one embodiment of the invention, the number of self-assembly is preferably 10 to 15
In one embodiment of the invention, the drying temperature is 80-100 ℃, and the drying time is 10-20 min.
The invention also provides a low-strength-loss anti-felting finishing liquid for wool, which comprises a liquid A, a liquid B, a liquid C, a liquid D and a liquid E, wherein the liquid A is a chlorinated solution containing 1-5wt% of dichloroisocyanurate DCCA and 1-3g/L of penetrating agent JFC, the liquid B is a reducing agent solution with the concentration of 4-8 wt%, the liquid C is an alkaline solution with the pH of 8-9, the liquid D is a chitosan finishing liquid of 5-10g/L, and the liquid E is a cellulose nanocrystalline solution of 1-5 g/L; the reducing agent is one or more of sodium bisulfite, sodium sulfite or sodium hydrosulfite, and the alkaline solution is one or more of sodium bicarbonate solution, sodium carbonate solution, sodium hydroxide solution or sodium citrate solution.
The invention also provides a using method of the low-strength-loss anti-felting finishing liquid for wool, which is characterized by comprising the following steps: placing wool fabrics or wool fibers in the solution A for treatment for 20-40min, dechlorinating the wool fabrics or the wool fibers in the solution B at 30-50 ℃ for 10-30min, placing the wool fabrics or the wool fibers in the solution C for neutralization at 30-50 ℃ for 10-30min, soaking the wool fabrics or the wool fibers subjected to chlorination felt-proofing treatment in the solution D for 1-5min, washing, soaking in the solution E for 1-5min, washing, repeating the soaking in the solution D and the solution E for 10-20 times, and drying after washing.
In one embodiment of the invention, the wool fabric or wool fiber is immersed in the A-E liquid at a bath ratio of 1:25 to 1: 50.
The invention has the following beneficial effects:
(1) the anti-felting performance is improved: on one hand, HClO generated in chlorination anti-felting treatment can hydrolyze the scale layer and the outer hydrophobic lipoid structure thereof, so as to achieve the purpose of destroying the scale layer to a certain degree; on the other hand, the chitosan with positive electricity and the cellulose nanocrystalline with negative electricity can form a natural polymer thin layer on the surface of wool fibers through layer-by-layer electrostatic self-assembly treatment, so that relative slippage between the fibers is limited, and the felting rate of the fabric can also be reduced. In addition, the thin layer has small polymer application amount and less influence on the fabric hand compared with the traditional polymer coating by a dipping or padding method.
(2) "repair" of fabric strength damage: on one hand, the invention firstly carries out chlorination subtraction anti-felting treatment to destroy the surface scale of the wool to a certain extent, and although the anti-felting performance is improved, the strength of the fabric is reduced. On the other hand, the cellulose nanocrystal has the characteristics of high crystallinity, high elastic modulus, high strength and the like, is a polyhydroxy reinforced filler, can be negatively charged due to generation of sulfonic acid groups in the preparation process by a sulfuric acid hydrolysis method, and can form a natural polymer thin layer with better toughness on the surface of wool fibers through electrostatic self-assembly with chitosan with positive charges; in addition, the cellulose nanocrystal with a large specific surface area and a large amount of hydroxyl on the surface can form a three-dimensional network structure with chitosan molecules through hydrogen bonds, and the film forming property and the strength of chitosan on the wool fiber matrix material are further enhanced in a layer-by-layer self-assembly mode, so that the strong damage effect of the fabric is compensated.
Detailed Description
Embodiments of the present invention are further illustrated with reference to examples. The following are merely further embodiments of the present invention, which includes but is not limited to the following.
The raw wool fabric used in the examples was worsted wool fabric. Wherein the fabric felt shrinkage is 22.9 percent, and the warp-wise tensile breaking strength is 405N.
Example 1
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) the wool fabric is mixed at a bath ratio of 1:25 placing the mixture in a mixing tank containing 3 wt% of Dichloroisocyanurate (DCCA), 1g/L of penetrating agent JFC and a bath ratio of 1:25 (pH 4) for 30min at room temperature, and then the fabric was treated at a bath ratio of 1:25 to 6% by weight of sodium hydrogen sulfite (NaHSO)3) Dechlorinating the wool fabric in the solution for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with the pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L of chitosan finishing liquid (bath ratio of 1: 50) for 5min, washing, soaking in 1g/L of cellulose nanocrystalline solution (bath ratio of 1: 50) for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly procedure for 10 times totally, and drying at 100 ℃ for 10 min.
When the concentration of the cellulose nanocrystal solution in the step (2) is 3g/L or 5g/L respectively, finishing the wool fabric according to the same method.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Example 2
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 3 wt% of Dichloroisocyanurate (DCCA), 1g/L of penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6 wt% sodium bisulfite (NaHSO)3) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L of chitosan finishing liquid (bath ratio of 1: 50) for 5min, washing, soaking in 2g/L of cellulose nanocrystalline solution (bath ratio of 1: 50) for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly process for 1, 5, 10, 15 and 20 times, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Example 3
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in 3 wt% of dichloroisocyanuric acidSalt (DCCA), 1g/L penetrant JFC, bath ratio 1:25 for 30min at room temperature, and then the fabric was treated with 6 wt% sodium bisulfite (NaHSO)3) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 10g/L of chitosan finishing liquid (bath ratio of 1: 50) for 5min, washing, soaking in 2g/L of cellulose nanocrystalline solution (bath ratio of 1: 50) for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly procedure for 10 times totally, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Example 4
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 3 wt% of Dichloroisocyanurate (DCCA), 1g/L of penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6 wt% sodium bisulfite (NaHSO)3) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L of chitosan finishing liquid (bath ratio of 1: 50) for 5min, washing, soaking in 3g/L of cellulose nanocrystalline solution (bath ratio of 1: 50) for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly procedure for 15 times, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Example 5
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 3 wt% of Dichloroisocyanurate (DCCA), 1g/L of penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6 wt% sodium bisulfite (NaHSO)3) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L of chitosan finishing liquid (bath ratio is 1: 50) for 5min, washing, soaking in 5g/L of cellulose nanocrystalline solution for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly procedure for 20 times totally, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Example 6
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 5wt% of Dichloroisocyanurate (DCCA), 3g/L of penetrant JFC and a bath ratio of 1:25 (pH 4) for 20min at room temperature, dechlorinating the fabric in 8 wt% sodium sulfite solution (bath ratio 1: 25) at 40 deg.C for 20min, and placing the wool fabric in NaHCO at pH 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L of chitosan finishing liquid (bath ratio is 1: 50) for 5min, washing, soaking in 2g/L of cellulose nanocrystalline solution for 5min, washing, sequentially repeating the soaking process in the chitosan finishing liquid and the cellulose nanocrystalline solution, repeating the self-assembly procedure for 10 times totally, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Comparative example 1
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
placing the wool fabric in a mixture of 3 wt% of Dichloroisocyanurate (DCCA), 1g/L of penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6 wt% sodium bisulfite (NaHSO)3) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min. And the felt shrinkage and tensile breaking strength of the finished fabric are tested according to the washing standard and the standard GB/T3923.1-2013 of the International wool agency TM31 wool textile product, and the test results are shown in Table 1.
Comparative example 2
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 3% Dichloroisocyanurate (DCCA), 1g/L penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6% sodium bisulfite (NaHSO)4) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Soaking the wool fabric treated in the step (1) in 5g/L chitosan finishing liquid (bath ratio is 1: 50) for 50min, washing with water, and drying at 100 ℃ for 10 min.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
Comparative example 3
A low-strength-loss shrink-proof finishing method for wool fabrics comprises the following steps:
(1) placing the wool fabric in a mixture of 3% Dichloroisocyanurate (DCCA), 1g/L penetrant JFC and a bath ratio of 1:25 for 30min at room temperature, and then the fabric was treated with 6% sodium bisulfite (NaHSO)4) In solution (bath ratio 1: 25) dechlorinating for 20min at 40 ℃, and finally placing the wool fabric in NaHCO with pH of 8-93In solution, neutralization was carried out at 40 ℃ for 20 min.
(2) Treating the wool fabric treated in the step (1) at a bath ratio of 1:50 soaking in 5g/L chitosan and 2g/L modified cellulose nanocrystalline finishing liquid for 50min, washing with water, and drying at 100 ℃ for 10 min.
The modified cellulose nanocrystalline is prepared by modifying the cellulose nanocrystalline by an enzyme method in a laccase/TEMPO system and then reacting the modified cellulose nanocrystalline with a Girard reagent T.
The felting rate and tensile breaking strength of the finished fabric were tested according to the international wool agency TM31 wool textile product washing standard and standard GB/T3923.1-2013, with the test results shown in table 1.
TABLE 1 Properties of wool fabrics after different anti-felting treatments
Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined in the appended claims.