A kind of stripping agent and stripping method for fabric dyed with flavonoid natural dye

Abstract

The invention discloses a stripping agent and a stripping method for fabrics dyed with flavonoid natural dyes. The stripping agent comprises component A and component B, wherein component A comprises stripping accelerator ZS, sodium hydroxide or sodium carbonate, and water, and the bath ratio is 1:5; and component B comprises stripping agent BS, sodium hydroxide or sodium carbonate, and water, and the bath ratio is 1:5. The stripping method comprises: (1) immersing the dyed fabric in component A and treating it for 60-80 minutes at a temperature of 70°C-90°C; (2) immersing the dyed fabric treated in step (1) in component B and treating it for 60-80 minutes at a temperature of 70°C-90°C. Based on the above steps (1) and (2), stripping of dyed cotton fabric or dyed silk fabric is achieved. Compared with a traditional stripping agent, the stripping rate of the stripping agent is significantly improved, and the stripping rate can reach 80%-90%. The stripping treatment has low damage to fiber strength and a wide range of applications, and can be applied to cellulose fabrics and protein fabrics dyed with natural dyes.

Description

Technical Field

[0001] The invention belongs to the technical field of textile dyeing, and in particular relates to a decolorizing agent and a decolorizing method for fabrics dyed with flavonoid natural dyes. Background Art

[0002] Natural dyes are mostly derived from plants and belong to biomass compounds. Fabrics dyed with natural dyes have natural and soft colors, are non-toxic and harmless to the human body, and have functional properties such as antibacterial and insect repellent, as well as biodegradability and environmental compatibility, and are deeply favored by consumers.

[0003] Natural dyes have complex ingredients and poor solubility, and are prone to color stains, color spots and other defects during the dyeing process. In particular, when dyeing cotton fabrics, cationic modification is required to form an ionic bond between the modified cotton fabric and the natural dye, thereby improving the natural dye uptake and dyeing fastness. However, since the modified cotton fabric has a positive charge, it is more likely to produce color spots, color spots and other defects during the dyeing process. Therefore, there is an urgent need for an auxiliary agent and method for stripping and repairing fabrics with color spots and color stains.

[0004] However, the stripping methods for synthetic dyes at home and abroad, namely, oxidation stripping method and reduction stripping method, have extremely poor stripping effect on natural dyes and cannot achieve stripping effect on natural dyed fabrics. Therefore, it is of great significance to develop stripping agents and stripping methods suitable for industrial dyeing fabrics with natural dyes, but there is no relevant report at home and abroad. Summary of the invention

[0005] The purpose of the present invention is to provide a stripping agent and a stripping method for fabric dyed with flavonoid natural dyes, so as to solve the dyeing defects such as color spots and color stains that occur in the dyeing process of natural dyes, and a stripping method using the stripping agent.

[0006] In order to solve the above technical problems, the following technical solutions are adopted:

[0007] A decolorizing agent for fabrics dyed with flavonoid natural dyes, characterized by comprising component A and component B:

[0008] Component A: stripping accelerator ZS, sodium hydroxide or sodium carbonate, water, bath ratio 1:5;

[0009] Component B: stripping agent BS, sodium hydroxide or sodium carbonate, water, bath ratio 1:5.

[0010] After optimization, component A and component B of the stripping agent for cotton fabric are respectively:

[0011] Component A: stripping accelerator ZS 10-14g / L, sodium hydroxide 6-8g / L, the balance is water, bath ratio 1:5;

[0012] Component B: stripping agent BS 4-8g / L, sodium hydroxide 1-3g / L, the balance is water, bath ratio 1:5.

[0013] After optimization, component A and component B of the stripping agent for silk fabric are respectively:

[0014] Component A: stripping accelerator ZS 6-10g / L, sodium carbonate 1-3g / L, the balance is water, bath ratio 1:5;

[0015] Component B: stripping agent BS 4-6g / L, sodium carbonate 1-3g / L, the balance is water, bath ratio 1:5.

[0016] Preferably, the stripping accelerator ZS is an organic phosphonic acid substance, and the stripping agent BS is a peroxide.

[0017] Preferably, the organic phosphonic acid substance is hydroxyethylidene diphosphonic acid or aminotrimethylphosphonic acid, and the peroxide is hydrogen peroxide or sodium percarbonate.

[0018] A method for stripping a flavonoid natural dye fabric by a stripping agent, characterized in that it comprises the following steps:

[0019] (1) Stripping accelerator pretreatment

[0020] 1) Prepare component A: mix stripping accelerator ZS, sodium hydroxide or sodium carbonate, and water to obtain an aqueous solution with a bath ratio of 1:5;

[0021] 2) Immerse the dyed fabric in component A and treat at a temperature of 70°C-90°C for 60-80 minutes;

[0022] (2) Stripping agent treatment

[0023] 1) Preparation of component B: Mix stripping agent BS, sodium hydroxide or sodium carbonate, and water to obtain an aqueous solution with a bath ratio of 1:5;

[0024] 2) Immerse the dyed fabric treated in step (1) in component B and treat at a temperature of 70° C. to 90° C. for 60 to 80 minutes.

[0025] After optimization, the stripping step of the dyed cotton fabric comprises:

[0026] (1) Stripping accelerator pretreatment

[0027] 1) Prepare component A: mix 10-14 g / L of stripping accelerator ZS, 6-8 g / L of sodium hydroxide, and the balance of water to obtain an aqueous solution with a bath ratio of 1:5;

[0028] 2) Immerse the dyed cotton fabric in component A and treat at a temperature of 70°C-90°C for 60-80 minutes;

[0029] (2) Stripping agent treatment

[0030] 1) Prepare component B: mix 4-8 g / L of stripping agent BS, 1-3 g / L of sodium hydroxide, and the balance of water to obtain an aqueous solution with a bath ratio of 1:5;

[0031] 2) Immerse the dyed cotton fabric treated in step (1) in component B and treat at a temperature of 70° C. to 90° C. for 60 to 80 minutes.

[0032] After optimization, the stripping step of the dyed silk fabric comprises:

[0033] (1) Stripping accelerator pretreatment

[0034] 1) Prepare component A: mix 6-10 g / L of stripping accelerator ZS, 1-3 g / L of sodium carbonate, and the balance of water to obtain an aqueous solution with a bath ratio of 1:5;

[0035] 2) immersing the dyed silk fabric in component A and treating at a temperature of 70°C-90°C for 60-80 minutes;

[0036] (2) Stripping agent treatment

[0037] 1) Prepare component B: mix 4-6 g / L of stripping agent BS, 1-3 g / L of sodium carbonate and the balance of water to obtain an aqueous solution with a bath ratio of 1:5;

[0038] 2) Immersing the dyed silk fabric treated in step (1) into component B and treating at a temperature of 70° C. to 90° C. for 60 to 80 minutes.

[0039] Preferably, the stripping accelerator ZS is an organic phosphonic acid substance, and the stripping agent BS is a peroxide.

[0040] Preferably, the organic phosphonic acid substance is hydroxyethylidene diphosphonic acid or aminotrimethylphosphonic acid, and the peroxide is hydrogen peroxide or sodium percarbonate.

[0041] The above technical solution has the following beneficial effects:

[0042] 1. The present invention provides a decolorizing agent for dyeing fabrics with flavonoid natural dyes. Compared with traditional decolorizing agents, the decolorizing agent has a significantly improved decolorizing rate, which can reach 80%-90%.

[0043] 2. The stripping treatment has little damage to the fiber strength and has a wide range of applications. It can be applied to cellulose fabrics and protein fabrics dyed with natural dyes.

[0044] 3. The stripping method of the present invention adopts a small bath ratio to reduce energy and water consumption; reduce the amount of stripping agent and alkali agent, greatly reduce costs, and has very good environmental protection, suitable for large-scale industrial promotion and application. DETAILED DESCRIPTION

[0045] The present invention will be further described below in conjunction with specific embodiments:

[0046] Example 1: Coconut shell dyed cotton fabric

[0047] (1) Stripping accelerator pretreatment

[0048] The coconut shell dyed cotton fabric was immersed in an aqueous solution of stripping accelerator ZS 10g / L, sodium hydroxide 6g / L, bath ratio 1:5, and treated at a temperature of 90℃ for 60min.

[0049] (2) Stripping agent treatment

[0050] The pretreated cotton fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium hydroxide at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0051] Example 2: Coconut shell dyed cotton fabric

[0052] (1) Stripping accelerator pretreatment

[0053] The coconut shell dyed cotton fabric was immersed in an aqueous solution of stripping accelerator ZS 12g / L, sodium hydroxide 7g / L, bath ratio 1:5, and treated at a temperature of 80℃ for 70min.

[0054] (2) Stripping agent treatment

[0055] The pretreated cotton fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 2 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 80°C for 70 minutes.

[0056] Example 3: Coconut shell dyed cotton fabric

[0057] (1) Stripping accelerator pretreatment

[0058] The coconut shell dyed cotton fabric was immersed in an aqueous solution of stripping accelerator ZS 14g / L, sodium hydroxide 8g / L, bath ratio 1:5, and treated at a temperature of 70℃ for 80min.

[0059] (2) Stripping agent treatment

[0060] The pretreated cotton fabric was immersed in an aqueous solution of 8 g / L stripping agent BS and 3 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 70°C for 80 minutes.

[0061] Embodiment 4: Longan shell dyeing cotton fabric

[0062] (1) Stripping accelerator pretreatment

[0063] The cotton fabric dyed with longan shell was immersed in an aqueous solution of 10 g / L stripping accelerator ZS and 6 g / L sodium hydroxide in a bath ratio of 1:5, and treated at a temperature of 90°C for 60 min.

[0064] (2) Stripping agent treatment

[0065] The pretreated cotton fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium hydroxide at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0066] Embodiment 5: Longan shell dyeing cotton fabric

[0067] (1) Stripping accelerator pretreatment

[0068] The cotton fabric dyed with longan shell was immersed in an aqueous solution of 12g / L stripping accelerator ZS and 7g / L sodium hydroxide in a bath ratio of 1:5, and treated at 80℃ for 70min.

[0069] (2) Stripping agent treatment

[0070] The pretreated cotton fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 2 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 80°C for 70 minutes.

[0071] Embodiment 6: Longan shell dyeing cotton fabric

[0072] (1) Stripping accelerator pretreatment

[0073] The cotton fabric dyed with longan shell was immersed in an aqueous solution of stripping accelerator ZS 14g / L, sodium hydroxide 8g / L, bath ratio 1:5, and treated at a temperature of 70℃ for 80min.

[0074] (2) Stripping agent treatment

[0075] The pretreated cotton fabric was immersed in an aqueous solution of 8 g / L stripping agent BS and 3 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 70°C for 80 minutes.

[0076] Example 7: Pomegranate peel dyed cotton fabric

[0077] (1) Stripping accelerator pretreatment

[0078] The pomegranate peel dyed cotton fabric was immersed in an aqueous solution of 10 g / L stripping accelerator ZS and 6 g / L sodium hydroxide in a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0079] (2) Stripping agent treatment

[0080] The pretreated cotton fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium hydroxide at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0081] Example 8: Pomegranate peel dyed cotton fabric

[0082] (1) Stripping accelerator pretreatment

[0083] The pomegranate peel dyed cotton fabric was immersed in an aqueous solution of 12 g / L stripping accelerator ZS and 7 g / L sodium hydroxide in a bath ratio of 1:5 and treated at 80°C for 70 min.

[0084] (2) Stripping agent treatment

[0085] The pretreated cotton fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 2 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 80°C for 70 minutes.

[0086] Example 9: Pomegranate peel dyed cotton fabric

[0087] (1) Stripping accelerator pretreatment

[0088] The pomegranate peel dyed cotton fabric was immersed in an aqueous solution of stripping accelerator ZS 14g / L, sodium hydroxide 8g / L, bath ratio 1:5, and treated at a temperature of 70℃ for 80min.

[0089] (2) Stripping agent treatment

[0090] The pretreated cotton fabric was immersed in an aqueous solution of 8 g / L stripping agent BS and 3 g / L sodium hydroxide at a bath ratio of 1:5 and treated at a temperature of 70°C for 80 minutes.

[0091] Embodiment 10: Longan seed dyed silk fabric

[0092] (1) Stripping accelerator pretreatment

[0093] The longan seed-dyed silk fabric was immersed in an aqueous solution of 6 g / L stripping accelerator ZS and 1 g / L sodium carbonate in a bath ratio of 1:5 and treated at 90°C for 60 min.

[0094] (2) Stripping agent treatment

[0095] The pretreated silk fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0096] Example 11: Longan seed dyed silk fabric

[0097] (1) Stripping accelerator pretreatment

[0098] The longan seed-dyed silk fabric was immersed in an aqueous solution of 8g / L stripping accelerator ZS and 2g / L sodium carbonate in a bath ratio of 1:5, and treated at 80°C for 70 minutes.

[0099] (2) Stripping agent treatment

[0100] The pretreated silk fabric was immersed in an aqueous solution of 5 g / L stripping agent BS and 2 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 80°C for 70 minutes.

[0101] Example 12: Longan seed dyed silk fabric

[0102] (1) Stripping accelerator pretreatment

[0103] The longan seed dyed silk fabric was immersed in an aqueous solution of 10 g / L stripping accelerator ZS and 3 g / L sodium carbonate in a bath ratio of 1:5 and treated at 70°C for 80 min.

[0104] (2) Stripping agent treatment

[0105] The pretreated silk fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 3 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 70°C for 80 minutes.

[0106] Example 13: Lychee-seed dyed silk fabric

[0107] (1) Stripping accelerator pretreatment

[0108] The lychee seed dyed silk fabric was immersed in an aqueous solution of stripping accelerator ZS 6g / L, sodium carbonate 1g / L, bath ratio 1:5, and treated at a temperature of 90℃ for 60min.

[0109] (2) Stripping agent treatment

[0110] The pretreated silk fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0111] Example 14: Lychee-seed dyed silk fabric

[0112] (1) Stripping accelerator pretreatment

[0113] The lychee seed dyed silk fabric was immersed in an aqueous solution of 8g / L stripping accelerator ZS and 2g / L sodium carbonate in a bath ratio of 1:5 and treated at 80°C for 70min.

[0114] (2) Stripping agent treatment

[0115] The pretreated silk fabric was immersed in an aqueous solution of 5 g / L stripping agent BS and 2 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 80°C for 70 minutes.

[0116] Example 15: Lychee-seed dyed silk fabric

[0117] (1) Stripping accelerator pretreatment

[0118] The lychee seed dyed silk fabric was immersed in an aqueous solution of 10 g / L stripping accelerator ZS and 3 g / L sodium carbonate in a bath ratio of 1:5 and treated at 70°C for 80 min.

[0119] (2) Stripping agent treatment

[0120] The pretreated silk fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 3 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 70°C for 80 minutes.

[0121] Example 16: Lychee shell dyed silk fabric

[0122] (1) Stripping accelerator pretreatment

[0123] The lychee shell dyed silk fabric was immersed in an aqueous solution of stripping accelerator ZS 6g / L, sodium carbonate 1g / L, bath ratio 1:5, and treated at a temperature of 90°C for 60min.

[0124] (2) Stripping agent treatment

[0125] The pretreated silk fabric was immersed in an aqueous solution of 4 g / L stripping agent BS and 1 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 90°C for 60 minutes.

[0126] Example 17: Lychee shell dyed silk fabric

[0127] (1) Stripping accelerator pretreatment

[0128] The lychee shell dyed silk fabric was immersed in an aqueous solution of 8 g / L stripping accelerator ZS and 2 g / L sodium carbonate in a bath ratio of 1:5 and treated at 80°C for 70 min.

[0129] (2) Stripping agent treatment

[0130] The pretreated silk fabric was immersed in an aqueous solution of 5 g / L stripping agent BS and 2 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 80°C for 70 minutes.

[0131] Example 18: Lychee shell dyed silk fabric

[0132] (1) Stripping accelerator pretreatment

[0133] The lychee shell dyed silk fabric was immersed in an aqueous solution of stripping accelerator ZS 10g / L, sodium carbonate 3g / L, bath ratio 1:5, and treated at 70℃ for 80min

[0134] (2) Stripping agent treatment

[0135] The pretreated silk fabric was immersed in an aqueous solution of 6 g / L stripping agent BS and 3 g / L sodium carbonate at a bath ratio of 1:5, and treated at a temperature of 70°C for 80 minutes.

[0136] The stripping effect of the above embodiment was evaluated by using SF600 PLUS colorimeter to test the surface color depth value (K / S value) of the dyed fabric before and after stripping. The K / S value of the fabric to be tested was tested at 3 different positions on the fabric and the average was taken. The stripping rate of the fabric was calculated according to the following formula. The higher the value, the better the stripping effect.

[0137]

[0138] In the formula, 1. Color depth of fabric surface before stripping, The color depth of the fabric surface after stripping.

[0139] The stripping rates of various embodiments and the surface color depth values ​​K / S values ​​of the dyed cotton fabrics before and after stripping are shown in Table 1.

[0140] Table 1 Stripping effect of each embodiment

[0141]

[0142] [Note]: Insurance powder stripping: KAl(SO4)2 mordanting: 2.87%, FeSO4 mordanting: 6.83%.

[0143] As shown in Table 1, after the cotton fabric is treated with the stripping agent BS, the stripping rate can reach up to 90.66% and the lowest can reach 80.68%, while the conventional stripping method, the stripping rate of the alum stripping of hydrosulfite and the ferrous sulfate mordant dyed fabric is only 2.87% and 6.83%. The stripping effect of the stripping agent BS is remarkable.

[0144] The stripping rate of each embodiment and the surface color depth value K / S value of the dyed silk fabric before and after stripping are shown in the following Table 2.

[0145] Table 2 Stripping effect of each embodiment

[0146]

[0147] [Note]: Insurance powder stripping: KAl(SO4)2 mordanting: 3.26%, FeSO4 mordanting: 8.30%.

[0148] As shown in Table 2, the stripping agent BS was used to treat alum and ferrous sulfate mordant silk fabrics. The stripping rate of alum mordant silk fabrics was up to 55.33% and the lowest was 43.21%. The stripping rate of ferrous sulfate mordant silk fabrics was up to 80.94% and the lowest was 64.38%. However, the conventional stripping method was used to strip alum and ferrous sulfate mordant silk fabrics with insurance powder. The stripping rate was only 3.26% and 8.30%. The stripping effect of the stripping agent BS was significant.

[0149] The above are only specific embodiments of the present invention, but the technical features of the present invention are not limited thereto. Any simple changes, equivalent replacements or modifications made based on the present invention to solve basically the same technical problems and achieve basically the same technical effects are all included in the protection scope of the present invention.

Claims

1. A method for stripping fabric dyed with flavonoid natural dyes, characterized in that The steps include: (1) Stripping accelerator pretreatment 1) Prepare component A: mix a stripping accelerator ZS, sodium hydroxide or sodium carbonate, and water to obtain an aqueous solution with a bath ratio of 1:5; the stripping accelerator ZS is an organic phosphonic acid substance, and the organic phosphonic acid substance is hydroxyethylidene diphosphonic acid or aminotrimethylphosphonic acid; 2) Immerse the dyed fabric in component A and treat at a temperature of 70℃-90℃ for 60-80min; (2) Stripping agent treatment 1) Prepare component B: mix a stripping agent BS, sodium hydroxide or sodium carbonate, and water to obtain an aqueous solution with a bath ratio of 1:5; the stripping agent BS is a peroxide, and the peroxide is hydrogen peroxide or sodium percarbonate; 2) Immerse the dyed fabric treated in step (1) in component B and treat at a temperature of 70°C-90°C for 60-80 minutes.

2. A method for stripping fabric dyed with flavonoid natural dyes according to claim 1, characterized in that: The stripping steps of dyed cotton fabric include: (1) stripping accelerator pretreatment 1) preparing component A: mixing stripping accelerator ZS 10-14g / L, sodium hydroxide 6-8g / L, and balance water to obtain an aqueous solution with a bath ratio of 1:5; 2) immersing the dyed cotton fabric in component A and treating it at a temperature of 70°C-90°C for 60-80min; (2) stripping agent treatment 1) preparing component B: mixing stripping agent BS 4-8g / L, sodium hydroxide 1-3g / L, and balance water to obtain an aqueous solution with a bath ratio of 1:5; 2) immersing the dyed cotton fabric treated in step (1) in component B and treating it at a temperature of 70°C-90°C for 60-80min.

3. A method for stripping fabric dyed with flavonoid natural dyes according to claim 1, characterized in that: The stripping step of the dyed silk fabric comprises: (1) stripping accelerator pretreatment 1) preparing component A: mixing stripping accelerator ZS 6-10g / L, sodium carbonate 1-3g / L, and balance water to obtain an aqueous solution with a bath ratio of 1:5; 2) immersing the dyed silk fabric in component A and treating it at a temperature of 70°C-90°C for 60-80min; (2) stripping agent treatment 1) preparing component B: mixing stripping agent BS 4-6g / L, sodium carbonate 1-3g / L, and balance water to obtain an aqueous solution with a bath ratio of 1:5; 2) immersing the dyed silk fabric treated in step (1) in component B and treating it at a temperature of 70°C-90°C for 60-80min.

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