Refining, bleaching and finishing method and color fixing and finishing method for medical textile

Abstract

The invention discloses a refining and bleaching finishing method and a fixation finishing method for a medical textile. The invention relates to a fixation finishing method of a medical textile. The fixation finishing method comprises an impregnation method and a padding method. The refining and bleaching effects are good, the application of a small molecular surfactant is avoided, and the cytotoxicity caused by surface activity residues is avoided; according to the present invention, the color fixation effect improving performance is good, the used monomers are all acrylic acid monomers, the polymerization efficiency is high, the residual monomers can be controlled very low, the selected monomers have characteristics of small odor and low toxicity, and the polymer has characteristics of large molecular weight, strong binding force with cotton fibers, difficult extraction or shedding, low cytotoxicity, and safety when the polymer is used for the medical dressing.

Description

Technical Field

[0001] The present invention relates to refining, bleaching and finishing, and color fixation finishing, in particular to a refining and bleaching finishing method and a color fixation finishing method for medical textiles. Background Art

[0002] As a medical consumable in direct contact with the wound surface, the safety and functionality of medical dressings are of crucial importance. In the production process of medical dressings, refining and impurity removal are key processes to ensure product quality, and dispersants play an indispensable role in this process. However, the currently commonly used small-molecule surfactant-based dispersants have exposed many problems in practical applications, seriously restricting the clinical application effect of medical dressings.

[0003] First of all, the residue problem of small-molecule surfactants is particularly prominent. Due to their small molecular weight, these dispersants are difficult to be completely removed in the subsequent cleaning process and are likely to remain in the fiber structure of the dressings. When the dressings come into contact with the wound surface, the residual surfactants will be gradually released, exerting a toxic effect on the wound surface cells. Research shows that even trace residues may inhibit cell proliferation and affect the wound healing process. Especially for patients with chronic wounds, whose wound environment is relatively fragile, the cytotoxicity of surfactants may lead to delayed wound healing and even cause inflammatory reactions.

[0004] Secondly, the chlorine fastness of small-molecule surfactants is poor, which is particularly obvious in the disinfection and use processes of medical dressings. Medical dressings usually need to undergo strict disinfection treatment before use, and chlorine-containing disinfectants are one of the commonly used disinfection means. However, small-molecule surfactants are prone to decomposition or denaturation in a chlorine-containing environment, not only reducing the dispersion effect but also possibly generating harmful by-products. These by-products may change the physical and chemical properties of the dressings, affecting key indicators such as liquid absorption performance and air permeability, and thus reducing the clinical use effect of the dressings.

[0005] In addition, the stability problem of small-molecule surfactants cannot be ignored. During storage, these dispersants are prone to degradation or reaction with other components, resulting in uncontrollable changes in the properties of the dressings. This instability not only affects the consistency of product quality but also may generate new harmful substances, increasing the clinical application risk.

[0006] For the dispersants used in the refining and impurity removal of existing medical dressings, due to the application of small-molecule surfactants, the residue of surfactants causes cytotoxicity and poor chlorine fastness. Summary of the Invention

[0007] To solve the above problems, the present invention provides a refining and bleaching finishing method and a color fixation finishing method for medical textiles.

[0008] The present invention provides the following technical solution: A refining, bleaching and finishing method for medical textiles, the steps are as follows: Add pure water to the white embryo cloth of medical textiles. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0. Heat up to 50 - 80 °C, add a cationic polymer. The mass ratio of the cationic polymer to pure water is 0.8 - 8:1000. After impregnating for 5 - 30 min, continue to heat up to 90 - 100 °C, add sodium hydrosulfite. The mass ratio of sodium hydrosulfite to pure water is 0.8 - 5:1000. After impregnating for another 10 - 60 min, drain the liquid; Then add pure water at room temperature for cleaning. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, drain the water, and perform the cyclic operation 2 - 5 times; The room temperature is 25 degrees Celsius; Continue to add pure water. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0. Heat up to 40 - 70 °C, add a cationic polymer, a soaping agent, and hydrogen peroxide with a mass concentration of 27 - 50%. The mass ratio of the cationic polymer to pure water is 0.8 - 8:1000. The mass ratio of the soaping agent to pure water is 0.4 - 4:1000. The mass ratio of hydrogen peroxide to pure water is 2.0 - 12.0:1000. After impregnating for 5 - 30 min, add sodium hydroxide. The mass ratio of sodium hydroxide to pure water is 1.0 - 8.0:1000. Heat up to 90 - 100 °C, keep warm and operate for 10 - 60 min, then drain the liquid; Then add pure water at room temperature for cleaning. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, drain the water, perform the cyclic operation 2 - 5 times, and take out the cloth.

[0009] Further, the soaping agent is one or several of an anionic aromatic sulfonic acid polymer or an anionic maleic-acrylic copolymer.

[0010] Further, the anionic aromatic sulfonic acid polymer includes: sodium lignosulfonate, formaldehyde condensate of methylnaphthalenesulfonate, sodium methylene bisnaphthalenesulfonate, and sodium polystyrenesulfonate.

[0011] Further, the anionic maleic-acrylic copolymer is sodium maleic-acrylic copolymer, and the molecular weight is between 450 and 30000.

[0012] A color fixation finishing method for medical textiles, including the impregnation method and the padding method; When processing by the impregnation method, the dosage of the cationic polymer is 0.5 - 50% of the weight of the medical textiles, the dosage of the softener is 1.0 - 300% of the weight of the medical textiles, the bath ratio is 1:5.0 - 50.0, the pH value of the working solution is 5.0 - 7.0, the working solution is a mixture of a cationic polymer, water, and a softener, the color fixation temperature is 40 - 70 °C, the color fixation time is 10 - 30 min, and the drying temperature is 100 - 170 °C; When processed by the padding method, the proportion of the cationic polymer in the working solution is 1-50 g / L, the proportion of the softener in the working solution is 5-300 g / L. The working solution is a mixture of a cationic polymer, water and a softener. The liquor pickup rate is 30-150%, and the curing temperature is 100-170 °C.

[0013] Furthermore, the softener is a weakly cationic softener, and is selected from one of soft flakes, ointments and amino silicone oil.

[0014] Furthermore, the molecular formula of the cationic polymer is as follows:

[0015] Among them, n is 5-30, x is 8-15, y is 10-25, z is 3-5, X is Cl, Br or I; R, R1, R2, R3, R4 and R5 are each any one of C1-C5 alkyl groups.

[0016] The beneficial effects of the present invention are as follows: (1) The refining and bleaching effect is good, the application of small molecule surfactants is avoided, and the cytotoxicity caused by the residue of surfactants is avoided; (2) The color fixing effect is improved well. The monomers used are all acrylic monomers, the polymerization efficiency is high, the residual monomers can be controlled very low, the monomers selected have small odor and low toxicity, and in addition, the polymer has a large molecular weight and a strong binding force with cotton fibers, is not easily extracted or fallen off, and has lower cytotoxicity, and is safer for medical dressings. Description of the Drawings

[0017] Figure 1 In [the drawings], a and b are optical microscope images of medical textiles after bleaching with clear water, c and d are optical microscope images of medical textiles after refining and bleaching finishing in Example 1, e and f are optical microscope images of medical textiles after refining and bleaching finishing in Example 2, and g and h are optical microscope images of medical textiles after refining and bleaching finishing in Example 3; Figure 2 are test result diagrams of medical textiles after color fixing finishing by the clear water dipping method and color fixing finishing in Examples 4-6; Figure 3 are test result diagrams of medical textiles after color fixing finishing by the clear water padding method and color fixing finishing in Examples 7-9. Detailed Embodiments

[0018] To further elaborate on the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the following combines the drawings and preferred embodiments to detail the specific embodiments, structures, features and their effects according to the present invention as follows.

[0019] This application prepares a cationic polymer through the following method: A method for preparing a cationic polymer, comprising the following steps: (1) Esterification reaction Add a catalyst accounting for 0.5 - 10% of the total mass of alkyl acrylic acid and polyoxyethylene alkylamine ether with a molar ratio of 1:1.05 - 1.20 and mix evenly. Under a vacuum degree ≥ 0.08 MPa·s, heat to 70 - 150 °C, keep the temperature for reaction for 3 - 10 h, release the vacuum and cool down (release the vacuum and cool down to room temperature, i.e., 25 °C), then alkyl acrylic acid polyoxyethylene alkylamine ether ester can be obtained; the catalyst is any one or two or three of concentrated sulfuric acid, dicyclohexylcarbodiimide (DCC), concentrated hydrochloric acid, p-toluenesulfonic acid, and thionyl chloride; the reaction formula is as follows:

[0020] ; Among them, R1, R2, and R4 are respectively selected from one of C1 - C5 alkyl groups, preferably one of C1 - C3 alkyl groups; n is 5 - 30; (2) Quaternization reaction Add a first solvent to the alkyl acrylic acid polyoxyethylene alkylamine ether ester to form solution A, dissolve benzyl alkyl halide in a second solvent to form solution B, and the molar ratio of alkyl acrylic acid polyoxyethylene alkylamine ether ester to benzyl alkyl halide is 1:1.02 - 1.10; the first solvent and the second solvent are one or several mixtures of organic ethers or organic esters such as a mixture of water and dipropylene glycol dimethyl ether, propylene glycol methyl ether acetate, and diethyl oxalate, the mass ratio of the first solvent to the alkyl acrylic acid polyoxyethylene alkylamine ether ester is 1 - 2:1, and the mass ratio of the second solvent to the benzyl alkyl halide is 1 - 2:1; at 30 - 45 °C, drop solution B into solution A at a constant speed within 1 - 2 h, then raise the temperature to 80 - 100 °C, keep the temperature for reaction for 2 - 5 h, and then cool down to obtain ammonium acrylate ether ester, and the reaction formula is as follows:

[0021]

[0022] Among them, R3 is selected from one of C1 - C5 alkyl groups, preferably one of C1 - C3 alkyl groups; (3) Polymerization reaction At room temperature (room temperature is 25 °C), an alkyl acrylaminoester monomer, an ammonium acrylate ether ester, a crosslinkable quaternary ammonium salt water-soluble cationic monomer and water with a mass ratio of 10.0:4.0 - 15.0:2.0 - 8.05:20.0 - 66.1 are added. The temperature is raised to 80 - 95 °C, and an initiator accounting for 0.1 - 1.5% of the total mass of the alkyl acrylaminoester monomer, the ammonium acrylate ether ester and the crosslinkable quaternary ammonium salt water-soluble cationic monomer is added dropwise, and the reaction is carried out under insulation for 2 - 8 h. Then the temperature is lowered and the product is discharged to obtain a cationic polymer; the initiator is hydrogen peroxide with a mass concentration of 50%, or azodiisobutyronitrile hydrochloride, or potassium persulfate, or ammonium persulfate, or a mixture of ammonium persulfate and sodium bisulfite with a molar ratio of 3:1; the reaction formula is as follows: ; Among them, R and R5 are each selected from one of C1 - C5 alkyl groups, preferably one of C1 - C3 alkyl groups; x is 8 - 15, y is 10 - 25, z is 3 - 5, and X is Cl, Br or I.

[0023] The crosslinkable quaternary ammonium salt water-soluble cationic monomer is prepared by the ring-opening and condensation reaction of an alkyl secondary amine and an epoxy halopropane. For details, see CN103922944A.

[0024] By adjusting the reaction conditions, Samples 1 - 6 are obtained, specifically as follows: Sample 1: 8.61 g (0.1 mol) of methacrylic acid, 136.51 g (0.1 mol) of dimethylamine polyoxyethylene ether and 1.11 g of concentrated sulfuric acid are added to a 500 ml four-necked flask, stirred and mixed evenly, evacuated, the vacuum degree is 0.08 MPa.s, heated to 70 °C, and the reaction is carried out under insulation for 10 h. Then the vacuum is released and the temperature is lowered to obtain dimethylamine polyoxyethylene ether methacrylate; 72.55 g (0.05 mol) of the esterified dimethylamine polyoxyethylene ether methacrylate is added to a 500 ml four-necked flask, and then 72.55 g of propylene glycol methyl ether acetate is added for dissolution to obtain Solution A. 11.88 g (0.051 mol) of benzyl methyl iodide is dissolved in a mixed solvent composed of 3.54 g of water and 17.82 g of dipropylene glycol dimethyl ether to form Solution B, which is placed in a constant pressure dropping funnel. The reaction flask is heated to 30 °C, and Solution B is added dropwise into Solution A at a constant speed within 1 h, then the temperature is raised to 80 °C, and the reaction is carried out under insulation for 2 h, and then the temperature is lowered to obtain an ammonium acrylate ether ester solution; At room temperature, add 100.00 g of methylamino acrylate monomer, 40 g of ammonium acrylate ether ester, 20 g of crosslinkable quaternary ammonium salt-based water-soluble cationic monomer and 200.00 g of water into a 500 ml four-necked flask. Heat up to 80 °C, slowly add 0.36 g of hydrogen peroxide with a mass concentration of 50%, and keep the reaction at this temperature for 2 h. Then cool down and discharge the material to obtain the cationic polymer; In the obtained product, n is 30, x is 15, y is 10, z is 3, X is I; R, R1, R2, R3, R4 and R5 are C1 alkyl groups, specifically CH3.

[0025] Sample 2: Add 43.05 g (0.5 mol) of methacrylic acid, 198.10 g (0.525 mol) of dipentylamine polyoxyethylene ether and 12.1 g of p-toluenesulfonic acid into a 500 ml four-necked flask. Stir and mix evenly, evacuate to a vacuum degree of 0.08 MPa.s, heat to 100 °C, keep the reaction at this temperature for 10 h, then release the vacuum and cool down to obtain dipentylamine polyoxyethylene ether methacrylate; Add 92.66 g (0.2 mol) of the esterified dipentylamine polyoxyethylene ether methacrylate into a 500 ml four-necked flask, and then add 138.99 g of diethyl oxalate to dissolve to obtain solution A. Dissolve 29.73 g (0.21 mol) of benzyl chloride in 44.60 g of diethyl oxalate to form solution B, and place it in a constant-pressure dropping funnel. Heat the reaction flask to 40 °C, and slowly add solution B into solution A at a constant speed within 2 h. Then heat up to 95 °C, keep the reaction at this temperature for 2 h, and then cool down to obtain the ammonium acrylate ether ester solution; At room temperature, add 50.00 g of propylamino acrylate monomer, 47.50 g of ammonium acrylate ether ester, 22.50 g of crosslinkable quaternary ammonium salt-based water-soluble cationic monomer and 225.00 g of water into a 500 ml four-necked flask. Heat up to 80 °C, slowly add 0.60 g of azobisisobutyronitrile hydrochloride, and keep the reaction at this temperature for 5 h. Then cool down and discharge the material to obtain the cationic polymer; In the obtained product, n is 5, x is 13, y is 12, z is 4, X is Cl; R is a C3 alkyl group, specifically C3H7; R1 and R2 are C5 alkyl groups, specifically C5H 11 ; R3, R4 and R5 are C1 alkyl groups, specifically CH3.

[0026] Sample 3: Add 43.05 g (0.5 mol) of methacrylic acid, 198.10 g (0.525 mol) of dipentylamine polyoxyethylene ether, and 24.11 g of dicyclohexylcarbodiimide into a 500 ml four-necked flask, stir and mix evenly, evacuate, and under a vacuum of 0.10 MPa.s, heat to 150 °C, keep the temperature for reaction for 8 h, vent and cool down to obtain dipentylamine polyoxyethylene ether methacrylate ester; Add 92.66 g (0.2 mol) of the esterified dipentylamine polyoxyethylene ether methacrylate ester obtained into a 500 ml four-necked flask, and then add 92.66 g of propylene glycol methyl ether acetate and 92.66 g of diethyl oxalate to dissolve to obtain solution A. Dissolve 41.49 g (0.21 mol) of pentylbenzyl chloride in a solvent composed of 41.49 g of propylene glycol methyl ether acetate and 41.49 g of diethyl oxalate to form solution B, and place it in a constant pressure dropping funnel. Heat the reaction flask to 40 °C, and dropwise add solution B into solution A at a constant speed within 2 h, then raise the temperature to 95 °C, keep the temperature for reaction for 3 h, and then cool down to obtain the ammonium salt solution of acrylic ether ester; Add 50.00 g of acrylic acid methylamino ester monomer, 47.50 g of ammonium salt of acrylic ether ester, 25.50 g of crosslinkable quaternary ammonium salt type water-soluble cationic monomer, and 225.00 g of water into a 500 ml four-necked flask at room temperature, raise the temperature to 85 °C, slowly add 2.44 g of potassium persulfate, keep the temperature for reaction for 6 h, cool down, and discharge to obtain the cationic polymer; In the obtained product, n is 5, x is 10, y is 12, z is 14, X is Cl; R and R4 are C1 alkyl groups, specifically CH3; R1, R2, and R3 are C5 alkyl groups, specifically C5H 11 ; R5 is a C2 alkyl group, specifically C2H5.

[0027] Sample 4: Add 21.53 g (0.25 mol) of methacrylic acid, 254.37 g (0.275 mol) of dimethylamine polyoxyethylene ether, 1.65 g of concentrated sulfuric acid, and 5.52 g of p-toluenesulfonic acid into a 500 ml four-necked flask, stir and mix evenly, evacuate, and under a vacuum of 0.10 MPa.s, heat to 135 °C, keep the temperature for reaction for 5 h, vent and cool down to obtain dimethylamine polyoxyethylene ether methacrylate ester; In a 500 ml four-necked flask, add 101.11 g (0.1 mol) of the esterified dimethylamino polyoxyethylene ether methacrylate, then add 131.44 g of water and 50.55 g of dipropylene glycol dimethyl ether for dissolution to obtain solution A. Dissolve 14.87 g (0.105 mol) of benzyl chloride methyl in 26.76 g of propylene glycol methyl ether acetate to form solution B, and place it in a constant pressure dropping funnel. Heat the reaction flask to 40 °C, and slowly add solution B into solution A at a constant speed within 1.5 h. Then raise the temperature to 95 °C, keep the temperature for reaction for 4 h, and then cool down to obtain the acrylate ether ammonium salt solution; At room temperature, add 50.00 g of ethylamino acrylate monomer, 47.50 g of acrylate ether ammonium salt, 25.50 g of crosslinkable quaternary ammonium salt type water-soluble cationic monomer and 225.00 g of water into a 500 ml four-necked flask. Raise the temperature to 85 °C, slowly add 3.06 g of ammonium persulfate, and keep the temperature for reaction for 6 h. Then cool down and discharge to obtain the cationic polymer; In the obtained product, n is 20, x is 10, y is 12, z is 4, X is Cl; R is C2 alkyl, specifically C2H4; R1, R2, R3, R4 and R5 are C1 alkyl, specifically CH3.

[0028] Sample 5: Add 28.77 g (0.25 mol) of propylacrylic acid, 209.33 g (0.275 mol) of dipropylamine polyoxyethylene ether and 23.81 g of concentrated hydrochloric acid with a mass concentration of 37% into a 500 ml four-necked flask. Stir and mix evenly, evacuate, and heat to 150 °C under a vacuum of 0.10 MPa.s. Keep the temperature for reaction for 3 h, then vent and cool down to obtain dipropylamine polyoxyethylene ether propylacrylate ester; In a 500 ml four-necked flask, add 87.63 g (0.1 mol) of the esterified dipropylamine polyoxyethylene ether propylacrylate ester, then add 26.29 g of water, 87.63 g of dipropylene glycol dimethyl ether and 43.82 g of diethyl oxalate for dissolution to obtain solution A. Dissolve 18.65 g (0.11 mol) of benzyl chloride propyl in a solvent composed of 7.89 g of water, 18.65 g of dipropylene glycol dimethyl ether and 9.32 g of diethyl oxalate to form solution B, and place it in a constant pressure dropping funnel. Heat the reaction flask to 45 °C, and slowly add solution B into solution A at a constant speed within 1.5 h. Then raise the temperature to 100 °C, keep the temperature for reaction for 5 h, and then cool down to obtain the acrylate ether ammonium salt solution; At room temperature, add 30.00 g of propyl acrylate amino ester monomer, 45.00 g of ammonium acrylate ether ester, 24.15 g of crosslinkable quaternary ammonium salt-based water-soluble cationic monomer and 180.00 g of water into a 500 ml four-necked flask. Heat up to 95 °C, slowly add 2.79 g of ammonium persulfate, and keep the reaction at this temperature for 7 h. Then cool down and discharge the material to obtain the cationic polymer. In the obtained product, n is 15, x is 8, y is 25, z is 5, X is Cl; R is a C5 alkyl group, specifically C5H 11 ; R1, R2, R3 and R4 are C3 alkyl groups, specifically C3H7; R5 is a C1 alkyl group, specifically CH3.

[0029] Sample 6: Add 8.61 g (0.1 mol) of methacrylic acid, 111.00 g (0.12 mol) of dimethylamine polyoxyethylene ether and 8.37 g of thionyl chloride into a 500 ml four-necked flask. Stir and mix evenly, evacuate, and under a vacuum degree of 0.10 MPa.s, heat to 150 °C and keep the reaction at this temperature for 5 h. Then release the vacuum and cool down to obtain dimethylamine polyoxyethylene ether methacrylate ester. Add 72.55 g (0.05 mol) of the esterified dimethylamine polyoxyethylene ether methacrylate ester obtained above into a 500 ml four-necked flask, and then add 72.55 g of water and 72.55 g of dipropylene glycol dimethyl ether to dissolve to obtain solution A. Dissolve 11.00 g (0.055 mol) of benzyl ethyl bromide in a mixed solvent composed of 11.00 g of water and 11.00 g of dipropylene glycol dimethyl ether to form solution B, and place it in a constant pressure dropping funnel. Heat the reaction flask to 45 °C, and slowly drop solution B into solution A within 1.5 h at a constant speed. Then heat up to 100 °C and keep the reaction at this temperature for 5 h. After that, cool down to obtain the ammonium acrylate ether ester solution. At room temperature, add 30.00 g of propyl acrylate amino ester monomer, 45.00 g of ammonium acrylate ether ester, 24.15 g of crosslinkable quaternary ammonium salt-based water-soluble cationic monomer and 198.30 g of water into a 500 ml four-necked flask. Heat up to 95 °C, slowly add 1.37 g of ammonium persulfate and 0.21 g of sodium bisulfite, and keep the reaction at this temperature for 8 h. Then cool down and discharge the material to obtain the cationic polymer. In the obtained product, n is 20, x is 8, y is 25, z is 5, X is Br; R, R1, and R2 are C1 alkyl groups, specifically CH3; R3 is a C2 alkyl group, specifically C2H5; R4 and R5 are C5 alkyl groups, specifically C5H 11 。

[0030] The following further illustrates the embodiments of the present invention through multiple examples.

[0031] Example 1 A refining, bleaching and finishing method for medical textiles, using Sample 1 as the cationic polymer, the steps are as follows: Add the white embryo cloth of medical textiles and pure water into the machine cylinder. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0, heat up to 50 °C, add the cationic polymer. The mass ratio of the cationic polymer to pure water is 0.8:1000. After running for 5 minutes, continue to heat up to 90 °C, add sodium hydrosulfite. The mass ratio of sodium hydrosulfite to pure water is 0.8:1000. After running for another 10 minutes, drain the liquid, then add pure water for cleaning. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0, drain the water, and perform the cycle operation 2 times; continue to add pure water into the cylinder. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0, heat up to 40 °C, add the cationic polymer, soap detergent, and hydrogen peroxide with a mass concentration of 27%. The mass ratio of the cationic polymer to pure water is 0.8:1000, the mass ratio of the soap detergent to pure water is 0.4:1000, and the mass ratio of hydrogen peroxide to pure water is 2.0:1000. After running for 5 minutes, add sodium hydroxide flakes. The mass ratio of sodium hydroxide flakes to pure water is 1.0:1000, heat up to 90 °C, keep warm and run for 10 minutes, then drain the liquid, add pure water for cleaning again. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0, drain the water, perform the cycle operation 2 times, and take out the cloth; The softener is a weakly cationic softener and is selected from soft flakes.

[0032] The soap detergent is an anionic aromatic sulfonic acid polymer, specifically sodium lignosulfonate. In some embodiments, a formaldehyde condensate of methylnaphthalenesulfonic acid, sodium methylene bisnaphthalenesulfonate or sodium polystyrenesulfonate can also be used.

[0033] The refining and bleaching effects are shown in Table 1 - Table 3: Table 1 Residues on the fabric after bleaching Item Standard Test Results Conclusion Soluble in water, % ≤0.5 0.25 OK Soluble in ether, % ≤0.5 0.45 OK Sulfated ash, % ≤0.4 0.23 OK Starch and dextrin The solution should not show blue, purple, light red or light brown Meet the standard OK pH value Neutral (neither should show pink) Neutral OK Extractable coloring matter The color of the filtrate should not be darker than that of control solution Y5 or G6 or the blue control solution Meet the standard OK Foreign fibers Occasionally, a small amount of isolated foreign fibers may exist Meet the standard OK Fiber identification Cotton fibers should meet the requirements of identification tests A, B and C Meet the standard OK Fluorescence Only show slightly brownish purple light and a small amount of yellow particles. Except for a small amount of isolated fibers, strong blue fluorescence should not be shown Meet the standard OK Table 2 Whiteness and water absorbency of the fabric after bleaching

[0034] Table 3 Pectin and wax content on the fabric surface after bleaching

[0035] Example 2 A refining, bleaching and finishing method for medical textiles, using Sample 2 as the cationic polymer, the steps are as follows: Add medical textile white blank fabric and pure water into the cylinder. The mass ratio of the medical textile white blank fabric to pure water is 1:26.5. Heat up to 65°C, and add a cationic polymer. The mass ratio of the cationic polymer to pure water is 4.4:1000. After running for 17.5 minutes, continue to heat up to 95°C, and add sodium hydrosulfite. The mass ratio of sodium hydrosulfite to pure water is 2.9:1000. After running for another 35 minutes, drain the liquid, then add pure water for cleaning. The mass ratio of the medical textile white blank fabric to pure water is 1:26.5. Drain the water and perform the cyclic operation 3 times; continue to add pure water into the cylinder. The mass ratio of the medical textile white blank fabric to pure water is 1:26.5. Heat up to 55°C, and add a cationic polymer, a soaping agent, and hydrogen peroxide with a mass concentration of 38.5%. The mass ratio of the cationic polymer to pure water is 4.4:1000. The mass ratio of the soaping agent to pure water is 2.2:1000. The mass ratio of hydrogen peroxide to pure water is 7:1000. After running for 17.5 minutes, add caustic soda. The mass ratio of caustic soda to pure water is 4.5:1000. Heat up to 95°C and keep it warm for 35 minutes, then drain the liquid, add pure water for cleaning again. The mass ratio of the medical textile white blank fabric to pure water is 1:26.5. Drain the water and perform the cyclic operation 3 times, then take out the fabric; The softener is a weakly cationic softener and is selected from ointments.

[0036] The soaping agent is an anionic maleic-acrylic copolymer, specifically sodium maleate-acrylate copolymer with a molecular weight of 30,000.

[0037] The scouring and bleaching effects are shown in Tables 4 - 6: Table 4 Residues on the fabric after bleaching Item Standard Test Results Conclusion Soluble in water, % ≤0.5 0.26 OK Soluble in ether, % ≤0.5 0.41 OK Sulfated ash, % ≤0.4 0.25 OK Starch and dextrin The solution should not show blue, purple, light red or light brown Meet the standard OK pH value Neutral (neither should show pink) Neutral OK Extractable coloring matter The color of the filtrate should not be darker than that of control solution Y5 or G6 or the blue control solution Meet the standard OK Foreign fibers Occasionally, a small amount of isolated foreign fibers may exist Meet the standard OK Fiber identification Cotton fibers should meet the requirements of identification tests A, B and C Meet the standard OK Fluorescence Only show slightly brownish purple light and a small amount of yellow particles. Except for a small amount of isolated fibers, strong blue fluorescence should not be shown Meet the standard OK Table 5 Whiteness and water absorbency of the fabric after bleaching

[0038] Table 6 Pectin and wax content on the fabric surface after bleaching

[0039] Example 3 A scouring, bleaching and finishing method for medical textiles, using Sample 3 as the cationic polymer. The steps are as follows: Add medical textile white blank fabric and pure water into the machine cylinder. The mass ratio of the medical textile white blank fabric to pure water is 1:50.0. Heat up to 80 °C, and add a cationic polymer. The mass ratio of the cationic polymer to pure water is 8:1000. After running for 30 minutes, continue to heat up to 100 °C, add sodium hydrosulfite. The mass ratio of sodium hydrosulfite to pure water is 5:1000. After running for another 60 minutes, drain the liquid, then add pure water for cleaning. The mass ratio of the medical textile white blank fabric to pure water is 1:50.0, drain the water, and perform the cyclic operation 5 times; continue to add pure water into the cylinder. The mass ratio of the medical textile white blank fabric to pure water is 1:50.0. Heat up to 70 °C, add a cationic polymer, a soap detergent, and hydrogen peroxide with a mass concentration of 50%. The mass ratio of the cationic polymer to pure water is 8:1000. The mass ratio of the soap detergent to pure water is 4:1000. The mass ratio of hydrogen peroxide to pure water is 12.0:1000. After running for 30 minutes, add sodium hydroxide. The mass ratio of sodium hydroxide to pure water is 8.0:1000. Heat up to 100 °C, keep warm and run for 60 minutes, then drain the liquid, add pure water for cleaning again. The mass ratio of the medical textile white blank fabric to pure water is 1:50.0, drain the water, perform the cyclic operation 5 times, and take out the fabric; The softener is a weakly cationic softener and is selected from amino silicone oil.

[0040] The soap detergent is sodium methylene bisnaphthalene sulfonate and sodium salt of maleic acid - acrylic acid copolymer with a molecular weight of 450, and the mass ratio is 1:2.

[0041] The scouring and bleaching effects are shown in Table 7 - Table 9: Table 7 Residues on the fabric after bleaching Item Standard Test Results Conclusion Soluble in water, % ≤0.5 0.27 OK Soluble in ether, % ≤0.5 0.38 OK Sulfated ash, % ≤0.4 0.31 OK Starch and dextrin The solution should not show blue, purple, light red or light brown Meet the standard OK pH value Neutral (neither should show pink) Neutral OK Extractable coloring matter The color of the filtrate should not be darker than that of control solution Y5 or G6 or the blue control solution Meet the standard OK Foreign fibers Occasionally, a small amount of isolated foreign fibers may exist Meet the standard OK Fiber identification Cotton fibers should meet the requirements of identification tests A, B and C Meet the standard OK Fluorescence Only show slightly brownish purple light and a small amount of yellow particles. Except for a small amount of isolated fibers, strong blue fluorescence should not be shown Meet the standard OK Table 8 Whiteness and water absorbency of the fabric after bleaching

[0042] Table 9 Pectin and wax content on the fabric surface after bleaching

[0043] Such as Figure 1 In a, b are optical microscope images of the medical textile after bleaching with clear water, c, d are optical microscope images of the medical textile after scouring, bleaching and finishing in Example 1, e, f are optical microscope images of the medical textile after scouring, bleaching and finishing in Example 2, g, h are optical microscope images of the medical textile after scouring, bleaching and finishing in Example 3. It can be seen that after scouring and bleaching according to the solution of this application, the medical textile has high color whiteness.

[0044] Example 4 A method for color fixing and finishing of medical textiles uses Sample 1 as the cationic polymer and adopts the impregnation method; When processed by the impregnation method, the dosage of the cationic polymer is 0.5% of the weight of the medical textile, the dosage of the softener is 1.0% of the weight of the medical textile, the bath ratio is 1:5.0, the pH value of the working solution is 5.0, the working solution is a mixture of the cationic polymer, water and the softener, the fixing temperature is 40 °C, the fixing time is 10 min, and the drying temperature is 100 °C.

[0045] The softener is a weakly cationic softener and is selected from soft flakes.

[0046] Example 5 A method for fixing and finishing a medical textile, using Sample 2 as the cationic polymer and adopting the impregnation method; When processed by the impregnation method, the dosage of the cationic polymer is 25% of the weight of the medical textile, the dosage of the softener is 150% of the weight of the medical textile, the bath ratio is 1:27.5, the pH value of the working solution is 6.0, the working solution is a mixture of the cationic polymer, water and the softener, the fixing temperature is 55 °C, the fixing time is 20 min, and the drying temperature is 135 °C.

[0047] The softener is a weakly cationic softener and is selected from ointments.

[0048] Example 6 A method for fixing and finishing a medical textile, using Sample 4 as the cationic polymer and adopting the impregnation method; When processed by the impregnation method, the dosage of the cationic polymer is 50% of the weight of the medical textile, the dosage of the softener is 300% of the weight of the medical textile, the bath ratio is 1:50.0, the pH value of the working solution is 7.0, the working solution is a mixture of the cationic polymer, water and the softener, the fixing temperature is 70 °C, the fixing time is 30 min, and the drying temperature is 170 °C.

[0049] The softener is a weakly cationic softener and is selected from amino silicone oil.

[0050] Example 7 A method for fixing and finishing a medical textile, using Sample 5 as the cationic polymer and adopting the padding method; When processed by the padding method, the proportion of the cationic polymer in the working solution is 1 g / L, the proportion of the softener in the working solution is 5 g / L, the working solution is a mixture of the cationic polymer, water and the softener, the liquor pickup rate is 30%, and the curing temperature is 100 °C.

[0051] The softener is a weakly cationic softener and is selected from soft flakes.

[0052] Example 8 When processed by padding method, the proportion of the cationic polymer in the working fluid is 25 g / L, and the proportion of the softener in the working fluid is 150 g / L. The working fluid is a mixture of cationic polymer, water and softener, the liquor pickup rate is 90%, and the baking temperature is 135 °C.

[0053] The softener is a weakly cationic softener and is selected from ointments.

[0054] Example 9 A color fixation finishing method for medical textiles uses Sample 6 as the cationic polymer and adopts the padding method; When processed by padding method, the proportion of the cationic polymer in the working fluid is 50 g / L, and the proportion of the softener in the working fluid is 300 g / L. The working fluid is a mixture of cationic polymer, water and softener, the liquor pickup rate is 150%, and the baking temperature is 170 °C.

[0055] The softener is a weakly cationic softener and is selected from amino silicone oil.

[0056] The following tests are carried out on Examples 4 - 9: Boiling water color fastness test method: Boil 600 ml of distilled water, take 20 grams of fabric, put it into the boiling distilled water, after boiling for 15 min, take out the fabric sample and observe the color depth of the residual liquid. The lighter the color of the residual liquid, the better the color fixation effect.

[0057] Alcohol color fastness test method: Take 20 grams of fabric, put it into 111.5 grams of 96% alcohol, soak it at room temperature (25 °C) for 2 h, take out the fabric sample and observe the color depth of the residual liquid. The lighter the color of the residual liquid, the better the color fixation effect.

[0058] The test results are as Figure 2 and Figure 3 , specifically: Figure 2 For a, it is the figure after boiling water treatment after color fixation finishing by the water immersion method. It can be seen that when directly treated with water, there are more floating colors remaining on the fabric, and the boiling water residual liquid is blue; among them Figure 2 For b, it is the figure of the residual liquid after alcohol soaking for 2 h after color fixation finishing by the water immersion method. It can be seen that the residual liquid is green after the fabric is soaked in alcohol, indicating the existence of floating colors; Figure 2 For c, it is the figure after boiling water treatment after color fixation finishing in Example 4. It can be seen that after color fixation finishing with Example 4, the floating colors remaining on the fabric are significantly reduced, and the boiling water residual liquid is light blue; Figure 2 For d, it is the figure of the residual liquid after alcohol soaking for 2 h after color fixation finishing in Example 4. It can be seen that the color of the residual liquid becomes significantly lighter to light green after the fabric is soaked in alcohol, indicating that the floating colors are significantly reduced; Figure 2Figure e shows the fabric after boiling following the color fixation treatment in Example 5. It can be seen that after the color fixation treatment in Example 5, the residual floating color on the fabric is significantly reduced, and the boiling residual liquid is light blue; Figure 2 Figure f shows the residual liquid after the fabric in Example 5 is soaked in alcohol for 2 hours following the color fixation treatment. It can be seen that the color of the residual liquid becomes significantly lighter to light blue after the fabric is soaked in alcohol, indicating that the floating color is significantly reduced; Figure 2 Figure g shows the fabric after boiling following the color fixation treatment in Example 6. It can be seen that after the color fixation treatment in Example 6, the residual floating color on the fabric is significantly reduced, and the boiling residual liquid is light blue; Figure 2 Figure h shows the residual liquid after the fabric in Example 6 is soaked in alcohol for 2 hours following the color fixation treatment. It can be seen that the color of the residual liquid becomes significantly lighter to light green after the fabric is soaked in alcohol, indicating that the floating color is significantly reduced; Figure 3 Figure a shows the fabric after boiling following the color fixation treatment using the padding method with water. It can be seen that when directly treated with water, there is more residual floating color on the fabric, and the boiling residual liquid is blue; among which Figure 3 Figure b shows the residual liquid after the fabric is soaked in alcohol for 2 hours following the color fixation treatment using the padding method with water. It can be seen that the residual liquid is green after the fabric is soaked in alcohol, indicating the presence of floating color; Figure 3 Figure c shows the fabric after boiling following the color fixation treatment in Example 7. It can be seen that after the color fixation treatment in Example 7, the residual floating color on the fabric is significantly reduced, and the boiling residual liquid is colorless; Figure 3 Figure d shows the residual liquid after the fabric in Example 7 is soaked in alcohol for 2 hours following the color fixation treatment. It can be seen that the color of the residual liquid becomes significantly lighter to colorless after the fabric is soaked in alcohol, indicating that the floating color is significantly reduced; Figure 3 Figure e shows the fabric after boiling following the color fixation treatment in Example 8. It can be seen that after the color fixation treatment in Example 8, the residual floating color on the fabric is significantly reduced, and the boiling residual liquid is light blue; Figure 3 Figure f shows the residual liquid after the fabric in Example 8 is soaked in alcohol for 2 hours following the color fixation treatment. It can be seen that the color of the residual liquid becomes significantly lighter to light green after the fabric is soaked in alcohol, indicating that the floating color is significantly reduced; Figure 3 Figure g shows the fabric after boiling following the color fixation treatment in Example 9. It can be seen that after the color fixation treatment in Example 9, the residual floating color on the fabric is significantly reduced, and the boiling residual liquid is light blue; Figure 3 Figure h shows the residual liquid after the fabric in Example 9 is soaked in alcohol for 2 hours following the color fixation treatment. It can be seen that the color of the residual liquid becomes significantly lighter to light green after the fabric is soaked in alcohol, indicating that the floating color is significantly reduced.

[0059] The above are only the preferred embodiments of the present invention, and do not impose any form of limitation on the present invention. Although the present invention has been disclosed above with the preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some changes or modifications to the above-disclosed technical content to form equivalent embodiments within the scope of the technical solution of the present invention. However, as long as it does not depart from the technical content of the technical solution of the present invention, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention still fall within the scope of the technical solution of the present invention.

Claims

1. A refining, bleaching and finishing method for medical textiles, characterized in that, The steps are as follows: Add pure water to the white embryo cloth of medical textiles. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, heat up to 50 - 80 °C, add a cationic polymer. The mass ratio of the cationic polymer to pure water is 0.8 - 8:1000. After impregnating for 5 - 30 min, continue to heat up to 90 - 100 °C, add sodium hydrosulfite. The mass ratio of sodium hydrosulfite to pure water is 0.8 - 5:1000. After impregnating for another 10 - 60 min, drain the liquid; Then add pure water at room temperature for cleaning. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, drain the water, and perform the cyclic operation 2 - 5 times; Continue to add pure water. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, heat up to 40 - 70 °C, add a cationic polymer, a soaping agent, and hydrogen peroxide with a mass concentration of 27 - 50%. The mass ratio of the cationic polymer to pure water is 0.8 - 8:1000, the mass ratio of the soaping agent to pure water is 0.4 - 4:1000, and the mass ratio of hydrogen peroxide to pure water is 2.0 - 12.0:1000. After impregnating for 5 - 30 min, add sodium hydroxide. The mass ratio of sodium hydroxide to pure water is 1.0 - 8.0:1000, heat up to 90 - 100 °C, keep warm for 10 - 60 min, and then drain the liquid; Then add pure water at room temperature for cleaning. The mass ratio of the white embryo cloth of medical textiles to pure water is 1:3.0 - 50.0, drain the water, perform the cyclic operation 2 - 5 times, and take out the cloth.

2. The method according to claim 1, characterized in that, The soaping agent is one or several of an anionic aromatic sulfonic acid polymer or an anionic maleic-acrylic copolymer.

3. The method according to claim 2, wherein The anionic aromatic sulfonic acid polymer includes: sodium lignosulfonate, formaldehyde condensate of sodium methylnaphthalenesulfonate, sodium methylene bisnaphthalenesulfonate, and sodium polystyrenesulfonate.

4. The method according to claim 2, wherein The anionic maleic-acrylic copolymer is sodium salt of maleic acid-acrylic acid copolymer, and its molecular weight is between 450 and 30000.

5. A method for fixing the color of a medical textile, characterized in that, It includes the dipping method and the padding method; When processed by the dipping method, the dosage of the cationic polymer is 0.5 - 50% of the weight of the medical textiles, the dosage of the softener is 1.0 - 300% of the weight of the medical textiles, the bath ratio is 1:5.0 - 50.0, the pH value of the working solution is 5.0 - 7.0, the working solution is a mixture of the cationic polymer, water, and the softener, the fixing temperature is 40 - 70 °C, the fixing time is 10 - 30 min, and the drying temperature is 100 - 170 °C; When processed by the padding method, the proportion of the cationic polymer in the working solution is 1 - 50 g / L, the proportion of the softener in the working solution is 5 - 300 g / L, the working solution is a mixture of the cationic polymer, water, and the softener, the liquor pickup rate is 30 - 150%, and the curing temperature is 100 - 170 °C.

6. The method according to claim 5, characterized in that, The softener is a weak cationic softener, and is selected from one of soft flakes, ointments, and amino silicone oil.

7. The method according to any one of claims 1-6, characterized in that, The molecular formula of the cationic polymer is as follows: ； Among them, n is 5 - 30, x is 8 - 15, y is 10 - 25, z is 3 - 5, X is Cl, Br, or I; R, R1, R2, R3, R4, and R5 are each any one of C1 - C5 alkyl groups.

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