Ecological phosphorus-free acid-free rapid bleaching process for cashmere and wool

Abstract

The invention discloses a cashmere and wool ecological phosphate-free acidic rapid bleaching process, which comprises a bleaching treatment step and a post-bleaching treatment step, the bleaching treatment step is to load cashmere or wool to be treated into a machine, and a bleaching liquid is added; in the post-bleaching treatment step, a deoxidizing enzyme preparation is added to remove residual hydrogen peroxide, and then drying treatment is performed. The bleaching auxiliary combination used in the process can quickly remove natural grease, pigments and impurities in cashmere and wool in a short time, and a good bleaching effect is achieved. By optimizing the concentration and proportion of the bleaching agent, the bleaching rate is improved, meanwhile, the tenderness of wool fibers in the bleaching process is ensured, and fiber breakage or strength reduction cannot be caused. In the bleaching process, treatment is carried out under the conditions of low temperature (50-70 DEG C) and normal pressure, so that the damage of high temperature to wool fibers can be effectively reduced, the toughness and luster of the fibers are kept, and meanwhile, the bleaching reaction rate is accelerated.

Description

Technical Field

[0001] The invention belongs to the field of bleaching processing, and in particular relates to an ecological phosphoric acid-free rapid bleaching process for cashmere and wool. Background Art

[0002] Cashmere and wool are widely used in high-end clothing, household goods and other fields due to their excellent warmth retention and softness. However, the traditional cashmere and wool bleaching process is usually complicated and easily causes fiber damage. Most of the existing cashmere and wool bleaching technologies rely on alkaline or strong oxidizing bleaching agents. Although they can effectively remove natural pigments, oils and impurities in wool, they will inevitably reduce the strength and softness of its fibers. Therefore, it is of great practical significance to develop a new environmentally friendly and efficient bleaching process that can quickly remove impurities in wool without damaging the fibers. Summary of the invention

[0003] Purpose of the invention: The present invention provides an ecological phosphoric acid-free rapid bleaching process for cashmere and wool. Through a specific bleaching agent and treatment process, impurities and natural pigments in cashmere and wool can be removed in a short time without significantly affecting the fiber strength and softness of the wool. The process has the advantages of simple operation, good bleaching effect, and low cost. It solves the problem that conventional acid bleaching cannot achieve the whiteness of traditional alkaline bleaching.

[0004] Technical solution: This technical solution proposes an innovative ecological phosphoric acid-free rapid bleaching process for cashmere and wool. By optimizing the formula of the bleaching solution, adjusting the temperature of the bleaching process, and reasonably controlling the time and the amount of chemicals used, it can achieve rapid, efficient, and environmentally friendly bleaching of cashmere and wool, and the whiteness can be comparable to traditional alkaline bleaching.

[0005] A cashmere wool ecological non-phosphate rapid bleaching process, comprising a bleaching treatment step and a post-bleaching treatment step, wherein the bleaching treatment step is to load the cashmere or wool to be treated into a machine and add a bleaching solution; the post-bleaching treatment step is to add a deoxygenating enzyme preparation to remove residual hydrogen peroxide, and then perform a drying treatment; The bleaching solution comprises hydrogen peroxide, bleaching aid C, bleaching aid D and bleaching aid E.

[0006] Furthermore, the bleaching aid C includes glycoside, limonene, isomeric tridecanol and polysorbate.

[0007] The role of bleaching aid C in the ecological phosphoric acid-free rapid bleaching process is to ensure the removal of oil, esters and stains from cashmere and wool at low temperatures, so as to facilitate the removal and penetration of fibers; to ensure the swelling of cashmere and wool protein fibers, so that the bleaching agent can enter the interior of the fibers at low temperatures, thereby achieving targeted anchoring bleaching of the yellow pigment on cashmere and wool; to ensure that the bleached yellow pigment is easy to wash and does not return to the fibers.

[0008] Furthermore, the bleaching aid D includes silicone, lanolin and hydrolyzed protein.

[0009] Although this process bleaches cashmere wool under low-temperature acidic conditions, the oxidant still causes certain damage to the protein fiber, so it is very important to control the damage of cashmere wool during the bleaching process. The role of bleaching aid D in the ecological phosphoric acid-free rapid bleaching process is to protect the protein fiber from the damage of the oxidant during the hydrogen peroxide bleaching process, replenish the oil lost in the cashmere wool fiber during the bleaching process, and maintain the soft and rich natural feel of the cashmere wool.

[0010] Furthermore, the bleaching aid E includes sodium dodecyl sulfate, tetrasodium iminodisuccinate, dicyandiamide, glucose, sodium citrate, sodium gluconate and citric acid, which are mostly compounded with phosphorus-free environmentally friendly food-grade raw materials, ensuring the environmental friendliness of the product.

[0011] The dicyandiamide, glucose, sodium gluconate, citric acid, and sodium citrate in bleaching aid E form a pH buffer system to ensure that the pH of the entire process is in the weak acid range of 5-7; it solves the problem that the old phosphoric acid-containing bleaching aids rely on adding alkaline aids to adjust the pH, and the problem of unstable pH. Cashmere wool and water contain certain metal ions, such as calcium ions, magnesium ions, iron ions, etc. These metal ions will ineffectively decompose hydrogen peroxide and cause serious damage to wool and cashmere. Tetrasodium iminodisuccinate, sodium gluconate, and sodium citrate in bleaching aid E can chelate and disperse these metal ions, ensure the effective decomposition of hydrogen peroxide, and achieve continuous bleaching of wool and cashmere; dicyandiamide, citric acid, and sodium citrate in the formula system of bleaching aid E can activate hydrogen peroxide under low temperature acidic conditions, ensure the continuous and effective decomposition of hydrogen peroxide, and achieve the purpose of bleaching.

[0012] By precisely adjusting the pH value of the bleaching solution and the concentration of the oxidative bleaching agent, this process can ensure that the cashmere and wool are whiter, more uniform and brighter after bleaching, avoiding the problems of color difference and lack of brightness that may occur in traditional methods. This makes the subsequent dyeing process smoother and the colors more vivid and lasting.

[0013] Furthermore, the main component of the deoxidase preparation is plant-extracted catalase, which is purified by grinding, centrifugation, chromatography and other technologies. The basic composition includes catalase, industrial salt, preservatives and pure water. When used for ecological non-phosphate rapid bleaching, it mainly serves the purpose of quickly removing hydrogen peroxide, reducing the number of water washings, improving production efficiency, reducing energy consumption, and facilitating the smooth progress of subsequent dyeing, finishing and post-treatment processes, thereby improving the overall quality of the final product.

[0014] Furthermore, the bleaching temperature is 50-70°C, the bleaching time is 30-60 minutes, and the pH is controlled at 5.0-7.0. Generally, the bleaching time can be controlled within 30-60 minutes, and can be flexibly adjusted according to the raw material type and color depth of wool and cashmere. Compared with traditional alkaline bleaching, the entire process time is reduced by about 65%.

[0015] Beneficial effects: The ecological phosphoric acid-free rapid bleaching process for cashmere and wool provided by the present invention adopts environmentally friendly food-grade, bio-based raw materials such as non-toxic, phosphorus-free, formaldehyde-free, and APEO-free, and is supplemented by green environmental protection technologies such as bio-enzyme preparations, thereby reducing the use of harmful chemicals and wastewater discharge in traditional bleaching processes. By optimizing the use of agents, the pollution to the environment during the production process is reduced, which meets the strict requirements of the modern textile industry for environmental protection and sustainable development. The bleached wastewater can be recycled and treated by modern water treatment equipment to minimize pollution to the environment. This process can not only significantly improve production efficiency, but also effectively protect the structure and luster of cashmere and wool fibers, reduce environmental pollution, and meet the requirements of sustainable development.

[0016] The bleaching aid combination used in the process of the present invention can quickly remove natural oils, pigments and impurities in cashmere and wool in a short time, achieving a good bleaching effect. By optimizing the concentration and ratio of the bleaching agent, the bleaching rate is increased, while ensuring that the bleaching process is mild to cashmere and wool fibers and does not cause fiber breakage or strength reduction. During the bleaching process, low temperature (50-70°C) and normal pressure conditions are used for treatment, which can effectively reduce the damage of high temperature to cashmere and wool fibers, maintain the toughness and gloss of the fibers, and accelerate the bleaching reaction rate.

[0017] The process has strong adaptability and can adjust the bleaching conditions according to the characteristics of different wools (such as cashmere, camel wool, yak wool, merino wool, goat wool, etc.), ensuring that ideal bleaching effects can be achieved on various cashmere and wool raw materials. This makes the process not only suitable for standard wool, but also for cashmere and wool raw materials of different batches and qualities. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a bleaching process diagram of Example 5 of the present invention.

[0019] Figure 2 It is a bleaching process diagram of Example 6 of the present invention.

[0020] Figure 3 This is a pre-treatment diagram of the bleaching process of Example 7 of the present invention.

[0021] Figure 4 This is a bleaching diagram of the bleaching process of Example 7 of the present invention.

[0022] Figure 5 This is a finishing diagram after the bleaching process of Example 7 of the present invention. DETAILED DESCRIPTION

[0023] In order to deepen the understanding of the present invention, the present invention will be further described in detail below in conjunction with embodiments and drawings. The embodiments are only used to explain the present invention and do not constitute a limitation on the protection scope of the present invention.

[0024] Example 1 The formula composition of bleaching aid C: Glucoside 5%, limonene 5%, isotridecyl alcohol 20%, polysorbate 15%, soft water 55%.

[0025] Example 2 The formula composition of bleaching aid D: Silicone 10%, lanolin 3%, hydrolyzed protein 2%, soft water 85%.

[0026] Example 3 The formula composition of bleaching aid E: Sodium lauryl sulfate 6%, tetrasodium iminodisuccinate 8%, dicyandiamide 8%, glucose 7%, sodium citrate 32% and sodium gluconate 33%, citric acid 6%.

[0027] Example 4 The formula composition of the deoxygenase preparation: Catalase 30%, industrial salt 5%, antibacterial agent 0.02%, pure water 64.98%.

[0028] Example 5 Ecological Phosphoric Acid-Free Rapid Bleaching Process for Cashmere Raw material preparation and dosage Cashmere (raw cashmere): 50 Kg, bath ratio (the weight ratio of cashmere to water): 1:10 A: Bleaching agent C: 0.5 Kg Bleaching aid D: 1 Kg Bleaching aid E: 2 Kg H2O2 (27.5% H2O2): 20 Kg B: Deoxygenase preparation: 0.25 Kg Processing steps, process diagram as follows Figure 1 As shown,

[0029] 1. Bleaching preparation: Load the cashmere raw materials into the equipment. The equipment is a closed container, and bleaching is carried out in a closed container to reduce evaporation loss and waste of bleaching agent, and improve resource utilization efficiency.

[0030] 2. Oxidative bleaching: Add the required bleaching aids into the prepared equipment, quickly heat up to 70°C, and maintain the temperature at 70°C for bleaching for 45 minutes. Hydrogen peroxide can effectively remove the natural pigments on cashmere and achieve a bleaching effect.

[0031] 3. Post-bleaching treatment: drain the water, add deoxidizing enzymes after adding new water, treat at 40℃ for 20 minutes to remove the yellow pigment and a small amount of residual hydrogen peroxide and biological agents. And ensure that the cashmere feels soft.

[0032] 4. Drying: Dry the treated cashmere naturally or use low-temperature drying equipment for drying. The temperature should be controlled below 70°C to avoid damage to the fiber caused by high temperature.

[0033] Effect evaluation

[0034] - The color of cashmere after bleaching becomes significantly lighter and whiter, and the impurities and excess oil in the raw material are effectively removed.

[0035] - After bleaching, cashmere maintains good fiber strength and softness, feels smooth, and does not show obvious fiber breakage or hardening.

[0036] - The total treatment time of the bleaching process is 100 minutes, which is more efficient than traditional methods.

[0037] Example 6 Ecological Phosphoric Acid-Free Rapid Bleaching Process for Wool Raw material preparation and dosage

[0038] Wool (raw wool): 25 Kg, bath ratio: 1:10 A: Bleaching agent C: 0.5 Kg Bleaching aid D: 0.5 Kg Bleaching agent E: 1 Kg H2O2(27.5%): 12.5 Kg B: Deoxygenase preparation: 0.125 Kg Processing steps, process diagram as follows Figure 2 As shown,

[0039] 1. Preparation for bleaching: Load the wool raw materials into the equipment.

[0040] 2. Oxidative bleaching: Add the required bleaching aids into the prepared equipment, maintain the temperature at 60°C, and perform bleaching for 60 minutes. Hydrogen peroxide can effectively remove the natural pigments on the wool and achieve a bleaching effect.

[0041] 3. Post-bleaching treatment: drain the water, add deoxidizing enzymes after adding new water, treat at 40℃ for 20 minutes to remove the yellow pigment and a small amount of residual hydrogen peroxide and biological agents. And ensure that the wool feels soft.

[0042] 4. Drying: Dry the treated wool naturally or use low-temperature drying equipment for drying. The temperature should be controlled below 60°C to avoid damage to the fiber caused by high temperature.

[0043] Effect evaluation

[0044] - After bleaching, the color of wool becomes significantly lighter and whiter, and impurities and excess oil in the raw material are effectively removed.

[0045] - After bleaching, the wool maintains good fiber strength and softness, feels soft, and does not show obvious fiber breakage or hardening.

[0046] - The total processing time of the bleaching process is 110 minutes, which is more efficient than traditional methods.

[0047] Under the same processing conditions, this method has the same good bleaching effect on wool, but if different whiteness is required, cashmere and wool with different whiteness can be obtained by adjusting the oxygen bleaching temperature and the amount of hydrogen peroxide.

[0048] Example 7 Comparative Example - Traditional Process Figure 3-5 As shown in the figure, the traditional alkaline bleaching process for cashmere and wool has the following auxiliaries and dosages:

[0049] 7-1 Cashmere 50 Kg, Wool detergent (Yuanqi Technology-Delijing FDL): 1KG Refining agent (Yuanqi Technology-Delijing CL): 1 Kg Alkaline oxygen bleaching stabilizer (Yuanqi Technology-Delibai P-480): 2Kg Penetrant (Yuanqi Technology-Debidu CIR): 1 Kg H2O2(27.5%):25 Kg Softener (Yuanqi Technology-Delirou WS): 0.5KG 7-2 Wool 25 Kg, Wool detergent (Yuanqi Technology-Delijing FDL): 1KG Refining agent (Yuanqi Technology-Delijing CL): 0.5Kg Alkaline oxygen bleaching stabilizer (Yuanqi Technology-Delibai P-480): 1 Kg Penetrant (Yuanqi Technology-Debidu CIR): 0.5Kg H2O2(27.5%):12.5 Kg Softener (Yuanqi Technology-Delirou WS): 0.25KG Traditional craft time: 300 minutes Pretreatment time: 60 minutes heating time + 50 minutes heat preservation time = 110 minutes Bleaching time: 50 minutes heating time + 100 minutes heat preservation time = 150 minutes Finishing time: 10 minutes heating time + 30 minutes heat preservation time = 40 minutes Example 8 Comparison of the strength of bleached cashmere single fibers From the test data in the table below, it can be seen that the breaking strength, elongation at break, elongation and breaking strength of cashmere fibers after ecological phosphorus-free rapid bleaching are significantly better than those after traditional alkaline bleaching, indicating that the damage to cashmere fibers after bleaching by ecological phosphorus-free bleaching is small. From the data on whiteness values, it can be seen that the whiteness value of ecological phosphorus-free rapid bleaching is comparable to that of traditional alkaline bleaching.

[0050] Breaking strength (CN) Elongation at break (mm) Elongation% Breaking strength (CN / dtex) Whiteness value Cashmere before bleaching 8.05 5.892 58.92 0.805 63.4 Eco-friendly phosphoric acid-free bleaching process 7.95 5.782 58.12 0.796 70.5 Traditional alkaline bleaching process 6.34 5.55 55.5 0.634 70.8 Example 9 Comparison of the strength of bleached wool single fibers From the test data in the table below, it can be seen that the breaking strength, elongation at break, elongation and breaking strength of single fiber of wool after ecological phosphorus-free bleaching are significantly better than those of traditional alkaline bleaching process. This shows that the damage of wool after bleaching by ecological phosphorus-free bleaching process is small. From the data of whiteness value, it can be seen that the whiteness value of ecological phosphorus-free rapid bleaching is equivalent to that of traditional alkaline bleaching.

[0051] Breaking strength (CN) Elongation at break (mm) Elongation% Breaking strength (CN / dtex) Whiteness value Wool before bleaching 6.94 5.58 55.8 0.694 60.5 Eco-friendly phosphoric acid-free bleaching process 6.22 5.38 55.8 0.602 69.3 Traditional alkaline bleaching process 4.73 4.644 46.44 0.473 69.1 The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A cashmere wool ecological non-phosphoric acid rapid bleaching process, characterized in that: The method comprises a bleaching treatment step and a post-bleaching treatment step. The bleaching treatment step is to load the cashmere or wool to be treated into a machine and add a bleaching liquid. The post-bleaching treatment step is to add a deoxygenating enzyme preparation to remove residual hydrogen peroxide and then perform a drying treatment. The bleaching solution comprises hydrogen peroxide, bleaching aid C, bleaching aid D and bleaching aid E.

2. The bleaching process according to claim 1, characterized in that: The total amount of the bleaching aid C, the bleaching aid D and the bleaching aid E is 5-10% of the weight of the bleached cashmere or wool.

3. The bleaching process according to claim 1, characterized in that: The bleaching aid C comprises glycoside, limonene, isomeric tridecanol and polysorbate.

4. The bleaching process according to claim 1, characterized in that: The bleaching aid D comprises silicone, lanolin and hydrolyzed protein.

5. The bleaching process according to claim 1, characterized in that: The bleaching aid E comprises sodium lauryl sulfate, tetrasodium iminodisuccinate and dicyandiamide.

6. The bleaching process according to claim 5, characterized in that: The bleaching aid E also includes glucose, sodium citrate, sodium gluconate and citric acid.

7. The bleaching process according to claim 1, characterized in that: The oxygen-deoxidizing enzyme preparation includes catalase.

8. The bleaching process according to claim 1, characterized in that: The bleaching temperature is 50-70°C, and the bleaching time is 30-60 minutes.

9. The bleaching process according to claim 1, characterized in that: The pH during the bleaching step is controlled at 5.0-7.0.

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