A pre-treatment process for high whiteness water-repellent elastic bandage

Abstract

The invention discloses a high-whiteness water-repellent elastic bandage pretreatment process, which uses scouring enzyme KA-M, can quickly and effectively remove cotton fiber pectin and lignin at 60°C, is conducive to low-alkali boiling and bleaching of elastic bandages, and has good whiteness and water repellency after continuous steam boiling and bleaching. The boiling and bleaching reaction is carried out under low-alkali conditions to effectively protect cotton fibers, effectively retain natural cotton wax and grease, and make the bandage water repellent grade ≥3; the process has high production efficiency, little damage to cotton fibers, and the elastic bandage has high quality and high breaking strength after steam boiling and bleaching; the discharged waste liquid has a low COD value, low sewage treatment cost, and is conducive to the protection of the ecological environment and energy conservation and emission reduction.

Description

Technical Field

[0001] The invention belongs to the technical field of pre-treatment of sanitary materials, and in particular relates to a pre-treatment process for a high-whiteness water-repellent elastic bandage. Background Art

[0002] Bandages are gauze bandages used to wrap wounds or affected areas. They are used to fix and protect surgical or injured areas. They are common medical supplies. Bandages are an important measure for emergency treatment at trauma sites. They can achieve compression and hemostasis, reduce infection, protect wounds, and fix fractures. Bandages can be divided into many categories according to different uses. They mainly include: ordinary medical bandages, elastic bandages, plaster bandages, etc.

[0003] Ordinary medical bandages are the most common type of bandages, which can be divided into single bandages and double bandages. Single bandages are made of gauze or cotton cloth, and are suitable for bandaging and fixing wounds on the head, chest, abdomen, limbs, tail, etc. Double bandages are bandages made in various shapes according to the part of the body where they are used. They are made of double-layer cotton cloth, and cotton of different thicknesses can be sandwiched in between. There are strips of cloth around the bandage for knotting and fixing, such as eye bandages, back and waist bandages, front chest bandages, abdominal bandages, and withers bandages.

[0004] Elastic bandage is a new member of the medical bandage family, made of stretch yarn, polyamide fiber, viscose rayon, polyester fiber, polypropylene fiber, polyurethane foam and other materials. Elastic bandage is elastic and can be bent to any complex shape. It is suitable for bandaging and fixing any part of the body, especially the parts that are not convenient to fix with other bandages. Elastic bandage is widely used in medical care, family self-help care, outdoor sports, field first aid, sports, postoperative care and various sports injuries. At the same time, it has an important auxiliary therapeutic effect on sprains of limbs, soft tissue abrasions, and joint swelling and pain.

[0005] Viscose plaster bandage is made by mixing powdered calcined gypsum, polyvinyl alcohol and polyvinyl acetate emulsion into a slurry of a certain concentration, then evenly applying the slurry on gauze, drying and cutting it. This type of bandage is suitable for orthopedic fracture fixation, deformity correction, inflammatory limb immobilization, diagnosis and treatment of bone tuberculosis and bone tumors, as well as bone arthroplasty, limb fixation and mold model making.

[0006] At present, there are mainly two types of pre-treatment processes for elastic bandages: continuous and intermittent. The boiling and bleaching process generally requires scouring agents, penetrants, oxygen bleaching stabilizers, chelating dispersants, hydrogen peroxide, caustic soda, citric acid, etc. There are problems such as the boiling and bleaching process has many types of materials, large amounts, unscientific combinations, and high water consumption. The boiled and bleached elastic bandage has high whiteness but poor water repellency, and a waterproof finishing agent needs to be added to meet the waterproof requirements, or the boiled and bleached elastic bandage has poor whiteness. Summary of the invention

[0007] The present invention aims at the problem of low whiteness and poor water repellent effect of bandages in the prior art, changes the traditional process, and provides a high whiteness water repellent elastic bandage pretreatment processing technology. The present invention simplifies the materials used for the pretreatment of the high whiteness water repellent elastic bandage to only four materials: scouring enzyme KA-M, caustic soda flakes, hydrogen peroxide and citric acid, scientifically and rationally adopts a continuous production process, simplifies the boiling and bleaching process, is easy to operate, has high production efficiency, low labor intensity, low energy consumption, low water consumption, and greatly reduces the comprehensive production cost.

[0008] The high whiteness water-repellent elastic bandage pretreatment process of the present invention utilizes scouring enzyme KA-M and adopts continuous steaming, boiling and bleaching process to complete the high whiteness water-repellent elastic bandage pretreatment production; specifically comprises the following steps:

[0009] (1) Cold water washing: Wash the bandage in a continuous stream with water at room temperature;

[0010] (2) Padding scouring enzyme: 2-4 g / L of padding scouring enzyme at 50-60°C, negative pressure suction, and a rolling rate of 60-70%;

[0011] (3) Insulation stacking: stacking at 60℃ for 30-45min;

[0012] (4) Dipping in working solution and steaming at a temperature of 100-102°C for 15-25 minutes.

[0013] (5) Hot water washing: 70-80℃ hot water washing 2 times;

[0014] (6) Cold water washing: 4 times of spray water washing at room temperature;

[0015] (7) Neutralization washing: add 0.2-0.3 g / L citric acid for neutralization washing, and the pH value of the neutralization solution is 6-7;

[0016] (8) Drying.

[0017] In step (2), the raw materials of the scouring enzyme KA-M are as follows by weight: alkaline pectinase (Shandong Fengtai Biotechnology Co., Ltd.) 20-30%, ligninase (Jiangsu Enming Bioengineering Technology Co., Ltd.) 10-15%, non-ionic penetrant JFC-M (Hai'an Guoyun Chemical Co., Ltd.) 20-25%, soda ash (Anhui Hongsifang Co., Ltd.) 0.1-0.2%, and the balance is water.

[0018] In step (4), the working solution is composed of 2-3 g / L of caustic soda flakes and 100-120 g / L of 27.5% hydrogen peroxide. Here, the amount added to the working solution is 100-120 g / L based on a 27.5% hydrogen peroxide solution, i.e., 1 L of the working solution contains 100-120 g of a 27.5% hydrogen peroxide solution.

[0019] The preparation method of the scouring enzyme KA-M comprises the following steps:

[0020] (1) First, slowly add alkaline pectinase and ligninase into water, stir at a speed of 70-100 rpm, and stir for 10-15 min;

[0021] (2) Add nonionic penetrant JFC-M to the system, stir at a speed of 50-70 rpm, and stir for 5-10 min;

[0022] (3) Add soda ash to the system, stir at a speed of 50-60 rpm, and stir for 5-10 min; filter the material to obtain scouring enzyme KA-M.

[0023] The high-whiteness water-repellent elastic bandage pretreatment process of the present invention uses a scouring enzyme KA-M composed of alkaline pectinase, ligninase and non-ionic penetrant, etc. The padding scouring enzyme can quickly and effectively remove cotton fiber pectin and lignin at 60°C, which is beneficial to low-alkali boiling and bleaching of the elastic bandage. After continuous steam boiling and bleaching, the elastic bandage has good whiteness and good water repellency. The boiling and bleaching reaction is carried out under low-alkali conditions to effectively protect the cotton fiber, effectively retain natural cotton wax and grease, and make the bandage water repellent level ≥3; the process has high production efficiency, little damage to cotton fiber, and the elastic bandage after steam boiling and bleaching has high quality and high breaking strength; the discharged waste liquid has a low COD value, low sewage treatment cost, and is beneficial to the protection of the ecological environment and energy conservation and emission reduction.

[0024] The present invention adopts a continuous steam boiling and bleaching process, which has the advantages of high production efficiency, easy process control, simple operation, stable quality, etc., and adopts enzyme technology to pre-treat medical bandages, which saves energy and reduces emissions, is environmentally friendly, reduces water consumption, and reduces sewage treatment costs.

[0025] The present invention can be widely used in the process of boiling and bleaching medical bandages, effectively ensuring the whiteness of the bandages ≥80 0 A and water repellency ≥ level 3, which meets the requirements of medical bandages and has good social and economic benefits. DETAILED DESCRIPTION

[0026] The specific implementation modes of the present invention are further described below in conjunction with the examples.

[0027] Example 1: Preparation of scouring enzyme KA-M

[0028] The raw materials are composed of 25% alkaline pectinase, 15% ligninase, 20% non-ionic penetrant JFC-M, 0.1% soda ash, and the balance is water.

[0029] Preparation method:

[0030] (1) First, slowly add alkaline pectinase and ligninase into water, stir at a speed of 70-100 rpm, and stir for 10-15 min;

[0031] (2) Add nonionic penetrant JFC-M to the system, stir at a speed of 50-70 rpm, and stir for 5-10 min;

[0032] (3) Add soda ash to the system, stir at a speed of 50-60 rpm, and stir for 5-10 min; filter the material to obtain scouring enzyme KA-M.

[0033] Embodiment 2:

[0034] The pre-treatment process of the high whiteness water-repellent elastic bandage in this embodiment specifically includes the following steps:

[0035] (1) Cold water washing: Wash the 5cm×450cm bandage in a flat piece at room temperature continuously;

[0036] (2) Padding scouring enzyme: 2 g / L padding scouring enzyme at 60°C, negative pressure suction, and a rolling rate of 60%;

[0037] (3) Insulation stacking: stacking at 60℃ for 30min;

[0038] (4) Padding working solution, heat preservation and steaming: Prepare the working solution in the high-level tank (taking 1000 kg as an example): put 898 kg of tap water into the high-level tank, add 2 kg of flake caustic soda while stirring, stir for 3 minutes, then add 100 kg of 27.5% hydrogen peroxide while stirring, stir for 2 minutes to obtain the working solution. Put the working solution from the high-level tank into the padding tank, pad the working solution at room temperature, the rolling rate is 150%, and steam at 102°C for 25 minutes;

[0039] (5) Hot water washing: 70-80℃ hot water washing 2 times;

[0040] (6) Cold water washing: 4 times of spray water washing at room temperature;

[0041] (7) Neutralization washing: add 0.2 g / L citric acid for neutralization washing, and measure the pH value of the neutralization solution to be 6-7;

[0042] (8) Drying.

[0043] The main technical indicators of the bandage treated by the above process are as follows:

[0044] Test items Whiteness(%) Water repellency level Breaking strength(N) Soluble matter in water (%) Boiling loss rate (%) Testing standards ≥80 ≥3 180*160 ≤0.5 ≤4 Test Results 80.6 3.5 216*172 0.39 3.5

[0045] The high whiteness water-repellent elastic bandage produced in this embodiment has a whiteness of 80.6 0 A. The water repellency can reach level 3.5, and the technical indicators such as breaking strength and soluble matter in water meet the requirements of medical bandages.

[0046] Embodiment 3:

[0047] The pre-treatment process of the high whiteness water-repellent elastic bandage in this embodiment specifically includes the following steps:

[0048] (1) Cold water washing: Wash the 5cm×500cm bandage in a flat piece at room temperature continuously;

[0049] (2) Padding scouring enzyme: 3 g / L padding scouring enzyme at 60°C, negative pressure suction, and 60% padding rate;

[0050] (3) Insulation stacking: 60℃ stacking for 40min

[0051] (4) Padding working solution, heat preservation and steaming: Prepare the working solution in the high-level tank (taking 1000 kg as an example): put 897 kg of tap water into the high-level tank, add 3 kg of flake caustic soda while stirring, stir for 3 minutes, then add 110 kg of 27.5% hydrogen peroxide while stirring, stir for 2 minutes to obtain the working solution. Put the working solution from the high-level tank into the padding tank, pad the working solution at room temperature, the rolling rate is 140%, and steam at 102°C for 20 minutes;

[0052] (5) Hot water washing: 70-80℃ hot water washing 2 times;

[0053] (6) Cold water washing: 4 times of spray water washing at room temperature;

[0054] (7) Neutralization washing: add 0.3 g / L citric acid for neutralization washing, and the pH value of the neutralization solution is 6-7;

[0055] (8) Drying.

[0056] The main technical indicators of the bandage treated by the above process are as follows:

[0057] Test items Whiteness(%) Water repellency level Breaking strength(N) Soluble matter in water (%) Boiling loss rate (%) Testing standards ≥80 ≥3 190*170 ≤0.5 ≤4 Test Results 80.9 3 224*192 0.32 3.7

[0058] The high whiteness water-repellent elastic bandage produced in this embodiment has a whiteness of 80.9 0 A, water repellency can reach level 3, and technical indicators such as breaking strength and soluble matter in water meet the requirements of medical bandages.

[0059] Embodiment 4:

[0060] The pre-treatment process of the high whiteness water-repellent elastic bandage in this embodiment specifically includes the following steps:

[0061] (1) Cold water washing: Wash the 15cm×600cm bandage in a flat piece at room temperature continuously;

[0062] (2) Padding scouring enzyme: 3 g / L padding scouring enzyme at 60°C, negative pressure suction, and 60% padding rate;

[0063] (3) Insulation stacking: 60℃ stacking for 45min

[0064] (4) Padding working solution, heat preservation and steaming: Prepare the working solution in the high-level tank (taking 1000 kg as an example): put 897 kg of tap water into the high-level tank, add 3 kg of flake caustic soda while stirring, stir for 3 minutes, then add 120 kg of 27.5% hydrogen peroxide while stirring, stir for 2 minutes to obtain the working solution. Put the working solution from the high-level tank into the padding tank, pad the working solution at room temperature, the rolling rate is 150%, and steam at 102°C for 25 minutes;

[0065] (5) Hot water washing: 70-80℃ hot water washing 2 times;

[0066] (6) Cold water washing: 4 times of spray water washing at room temperature;

[0067] (7) Neutralization washing: add 0.3 g / L citric acid for neutralization washing, and the pH value of the neutralization solution is 6-7;

[0068] (8) Drying.

[0069] The main technical indicators of the bandage treated by the above process are as follows:

[0070] Test items Whiteness(%) Water repellency level Breaking strength(N) Soluble matter in water (%) Boiling loss rate (%) Testing standards ≥80 ≥3 200*180 ≤0.5 ≤4 Test Results 81.2 3 235*203 0.28 3.8

[0071] The high whiteness water-repellent elastic bandage produced in this embodiment has a whiteness of 81.2 0 A, water repellency can reach level 3, and technical indicators such as breaking strength and soluble matter in water meet the requirements of medical bandages.

[0072] Comparison of embodiments:

[0073] Comparison between the pretreatment process of pure cotton high whiteness water-repellent elastic bandage and the conventional pretreatment process of water-repellent elastic bandage:

[0074] (1) Comparison of the material ratios of pure cotton high whiteness water-repellent elastic bandage pretreatment and conventional water-repellent elastic bandage pretreatment:

[0075]

[0076] (2) Comparison of the pretreatment process of pure cotton high whiteness water-repellent elastic bandage and conventional pretreatment process of water-repellent elastic bandage:

[0077]

[0078]

[0079] (3) Comparison of test results between pretreatment of pure cotton high whiteness water-repellent elastic bandage and conventional pretreatment of water-repellent elastic bandage:

[0080]

[0081] The high whiteness water-repellent elastic bandage pretreatment process of the present invention uses a scouring enzyme KA-M developed by Hefei Dongfang Meijie Molecular Materials Technology Co., Ltd., uses enzyme technology to pre-treat medical bandages, and can quickly and effectively remove cotton fiber pectin and lignin after impregnation and rolling with the scouring enzyme and heat preservation at 60°C, which is beneficial to low-alkali boiling and bleaching of the elastic bandage. After continuous steam boiling and bleaching, the elastic bandage has good whiteness and good water repellency. The boiling and bleaching reaction under low-alkali conditions can effectively protect cotton fibers, effectively retain natural cotton wax and grease, and make the bandage water repellent grade reach level 3; the process has high production efficiency, the process is easy to control, the damage to cotton fibers is small, the elastic bandage after steam boiling and bleaching is high in quality and high in breaking strength; the discharged waste liquid has a low COD value, the sewage treatment cost is low, and it is beneficial to the protection of the ecological environment and energy conservation and emission reduction.

[0082] The above description is only a preferred embodiment of the present invention and does not limit the present invention. For those skilled in the art, the present invention may have various changes and improvements. Any modifications, substitutions, etc. made within the concept and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A high whiteness water-repellent elastic bandage pre-treatment process, characterized by: Using scouring enzyme KA-M and continuous steaming, boiling and bleaching process, the pre-treatment production of high whiteness water-repellent elastic bandage is completed, which specifically includes the following steps: (1) Cold water washing: Wash the bandage in a continuous stream with water at room temperature; (2) Padding scouring enzyme: 50-60℃ flat width padding scouring enzyme KA-M 2-4g / L, negative pressure suction, rolling rate 60-70%; (3) Insulation stacking: stacking at 60℃ for 30-45min; (4) Dipping in working solution and steaming at a constant temperature: dipping in working solution at room temperature, with a rolling rate of 130-150%, and steaming at 100-102°C for 15-25 minutes; (5) Hot water washing: 70-80℃ hot water washing 2 times; (6) Cold water washing: 4 times of spray water washing at room temperature; (7) Neutralization washing: add 0.2-0.3 g / L citric acid for neutralization washing, and the pH value of the neutralization solution is 6-7; (8) drying; In step (2), the raw materials of the scouring enzyme KA-M are as follows by weight: 20-30% alkaline pectinase, 10-15% ligninase, 20-25% non-ionic penetrant JFC-M, 0.1-0.2% soda ash, and the balance is water; In step (4), the working solution is composed of 2-3 g / L of flake caustic soda and 100-120 g / L of hydrogen peroxide with a mass fraction of 27.5%.

2. The processing technology according to claim 1, characterized in that The preparation method of the scouring enzyme KA-M comprises the following steps: (1) First, slowly add alkaline pectinase and ligninase into water, stir at a speed of 70-100 rpm, and stir for 10-15 min; (2) Add nonionic penetrant JFC-M to the system, stir at a speed of 50-70 rpm, and stir for 5-10 min; (3) Add soda ash to the system, stir at a speed of 50-60 rpm, and stir for 5-10 min; filter the material to obtain scouring enzyme KA-M.

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