Preparation process of purple suede microfiber fabric

Abstract

The present application relates to the technical field of suede microfiber fabric processing, and in particular to a preparation process of a purple suede microfiber fabric, comprising the following preparation steps: S1, preparing a non-woven fabric by means of sea-island type composite fibers; S2, soaking the non-woven fabric in an anionic active solution, and then soaking the dried non-woven fabric in a polyvinyl alcohol aqueous solution for heat setting; S3, sanding the shaped non-woven fabric to obtain a suede microfiber; S4, passing the suede microfiber through a polyurethane impregnation slurry, and then through an aqueous solution of dimethylamide, so that the polyurethane solidifies and forms pores, and a suede microfiber base fabric is obtained; S5, reducing and opening the suede microfiber base fabric, and dyeing it; S6, soaking the dyed suede microfiber base fabric in a color fixing agent, and drying it to obtain a purple suede microfiber fabric. The purple suede microfiber fabric prepared by the above process has bright color and good color fastness, and will not fade or deteriorate after long-term use.

Description

Technical Field

[0001] The present application relates to the technical field of suede microfiber fabric processing, and in particular to a preparation process of purple suede microfiber fabric. Background Art

[0002] Suede microfiber is made of pure microfiber as base fabric, and then made by softening, dyeing and sanding. It has the suede look and touch of genuine leather. Suede microfiber can be used to make clothing, shoes, bags, gloves and car interiors, etc. As suede microfiber is used more and more widely, the demand for suede microfiber color is also increasing. Among them, purple suede microfiber is also a color that people have always loved. Purple can be obtained by dyeing with three triphenylmethane dyes with similar composition and properties: methyl violet, gentian violet and crystal violet. The main reason is that triphenylmethane dyes have simple structure and bright color, and the purple dyed is better.

[0003] However, compared with general fibers, ultrafine fibers have smaller fiber density and larger surface area. It is difficult for ultrafine fibers to stably adsorb triphenylmethane dyes on their surface, which makes the suede microfibers have poorer color fastness and cannot maintain the bright purple color for a long time. They will also fade and have poor color. Summary of the invention

[0004] In order to solve the problem that suede microfiber has poor color fastness and cannot maintain the bright purple color for a long time, and is prone to fading and poor color, the present application provides a preparation process of purple suede microfiber fabric.

[0005] A preparation process of purple suede microfiber fabric adopts the following technical scheme:

[0006] A preparation process of a purple suede microfiber fabric comprises the following preparation steps:

[0007] S1. preparing a non-woven fabric by needle punching the sea-island composite fiber;

[0008] S2, soaking the non-woven fabric in a 10-20% by mass cationic active solution, taking it out, drying it, and then soaking the dried non-woven fabric in a 5-10% by mass polyvinyl alcohol aqueous solution, taking it out, and then heat setting it;

[0009] S3, grinding the shaped non-woven fabric to obtain suede microfiber;

[0010] S4, passing the suede microfiber through the polyurethane impregnation slurry to make it fully impregnated, and then passing it through an aqueous solution of dimethylamide with a concentration of 20-30% and a temperature of 25-30° C. to make the polyurethane coagulate and form pores, and then washing and drying to obtain a suede microfiber base cloth;

[0011] S5. Reduce the weight of the suede microfiber base fabric and perform dyeing treatment. Use a padder to completely immerse the ground suede microfiber base fabric into a dyeing solution, wherein the dyeing solution includes 6-10 parts of triphenylmethane dye, 3-6 parts of acetic acid, 3-5 parts of sodium sulfate, 20-25 parts of a leveling agent, 10-15 parts of diethylene glycol dibenzoate, 2-4 parts of sodium lignin sulfonate, 20-30 parts of ethanol and 40-60 parts of water; S6. Soak the dyed suede microfiber base fabric in a fixing agent, soak at a temperature of 60-80°C, and then dry to obtain a purple suede microfiber fabric.

[0012] The purple suede microfiber fabric prepared by the above technical solution has bright color and will not fade or deteriorate after long-term use. The present application improves the dyeing efficiency of suede microfiber and the color fastness of purple by selecting sea island fibers and optimizing the process, effectively preventing purple from fading or discoloring.

[0013] The fiber of the island-shaped composite microfiber is finer than the general microfiber, so that the pores between the fibers can produce capillary-like core adsorption capacity, which can have a good absorption effect on triphenylmethane dye liquid and improve the dyeing effect. At the same time, the island-shaped fiber can make the fabric soft and smooth with obvious comfort due to its tiny fineness, and can obtain a fabric with high waterproofness, tightness, hygroscopicity, unique beauty and fashion style. Through needle-punching, the fiber material is arranged loosely, and many small holes are formed between the fibers, which are easier to absorb triphenylmethane dye liquid and have better dyeing effect.

[0014] In step S2, the nonwoven fabric is first immersed in an anionic solution, so that the surface performance of the nonwoven fabric is reduced, and polyvinyl alcohol is more easily adhered to, which is also conducive to subsequent dyeing. Suede microfiber is a relatively soft fabric, and the effect of direct sanding is not good, and the density of the suede is uneven, and the subsequent dyeing effect will also be poor. Polyvinyl alcohol can increase the stiffness of the nonwoven fabric after heat setting, so as to facilitate the sanding. At the same time, polyvinyl alcohol can be removed by washing in the subsequent steps, and does not affect the softness of the suede microfiber.

[0015] By soaking in polyurethane impregnation slurry, polyurethane forms a continuous elastic body with countless micropores in the three-dimensional network structure of suede microfiber. When the sea component is removed, the micropores further increase the absorption capacity of triphenylmethane dye solution, thereby improving the dyeing effect.

[0016] In step S5, the sea portion of the island-in-sea composite fiber is removed by reducing the fiber opening to obtain extremely fine fibers, which is beneficial to improving the density and uniformity of the fluff on the surface of the fabric and improving the dyeing uniformity of the suede microfiber.

[0017] The reduced fiber opening greatly improves the adsorption capacity and adsorption rate of dyes, which will reduce the fiber levelness. By using the various components in the dyeing solution of the present application to cooperate with each other, the dyeing effect and color fastness of the triphenylmethane dye are improved. Among them, acetic acid and diethylene glycol dibenzoate can improve the solubility and color enhancement of triphenylmethane dye in the dyeing solution, and improve the ability of triphenylmethane dye to adhere to suede microfiber. Sodium sulfate and sodium wood sulfonate can promote the absorption of triphenylmethane dye by sea island fiber, improve the dyeing effect, and at the same time reduce the shedding of triphenylmethane dye from suede microfiber, thereby improving color fastness.

[0018] In step S6, the color fastness and water resistance of the triphenylmethane dye are improved by the action of the color fixing agent, thereby preventing the purple suede microfiber fabric from falling off or fading during use and washing.

[0019] Preferably, the polyurethane impregnation slurry is obtained by mixing the following raw materials in parts by weight:

[0020] Polyurethane 15-20 parts

[0021] 80-100 parts of N,N-dimethylformamide

[0022] 0.5-2 parts of foam leveling agent

[0023] 1-5 parts of cell regulator.

[0024] By adopting the above technical scheme, polyurethane forms dense and uniformly sized bubbles in the three-dimensional network structure of suede microfiber, which is beneficial for the suede microfiber base cloth to uniformly absorb the dyeing solution and improve the uniformity of dyeing. The foam leveling agent promotes the formation of uniformly sized bubbles, and the bubble regulator can prevent the bubbles from being too large or too small.

[0025] Preferably, each portion of the leveling agent comprises polyethyleneimine, octadecyl isocyanate and polyoxyethylene stearate in a weight ratio of (10-12):(3-5):6.

[0026] By adopting the above technical scheme, the dispersibility, permeability and adhesion of the dyeing solution are improved, which is beneficial to improving the dyeing effect and color fastness. Among them, polyethyleneimine has high adhesion, which improves the adhesion of the dyeing solution to the guide fiber and reduces discoloration. Octadecyl isocyanate can improve the affinity of the dyeing solution to polyurethane. Polyoxyethylene stearate and triphenylmethane dye molecules are combined with hydrogen bonds, which can improve the dyeing uniformity of the non-woven fabric. The three are used in coordination, so that the suede microfiber can be dyed quickly, and the dyeing effect is good, uniform, and the color fastness is high.

[0027] Preferably, the anion active liquid is one of a sulfonate solution, a sulfate ester solution or a phosphate solution.

[0028] By adopting the above technical solution, the surface properties of the non-woven fabric are effectively reduced, the adhesion of polyvinyl alcohol to the surface of the non-woven fabric is improved, the hardness of the non-woven fabric is increased, and it is beneficial to sanding.

[0029] Preferably, in step S6, the color fixing agent comprises sodium chloride with a concentration of 20-30 g / L, silicone oil with a concentration of 15-18 g / L, acetic acid with a concentration of 20-30 g / L, and tobotidine with a concentration of 20-30 g / L.

[0030] By using sodium chloride, silicone oil, acetic acid and tobaetidine together, the color fastness of purple suede microfiber fabric is improved and the color is not faded after long-term use. Tobaetidine has good anti-ultraviolet effect. It is used in the preparation of color fixing agent to improve the anti-ultraviolet performance of the color fixing agent, which is beneficial to improve the sunlight fastness of ultraviolet suede microfiber; silicone oil has good waterproof effect and will form a protective film on the surface of suede microfiber, which improves the color friction fastness of purple suede microfiber; acetic acid can enhance the color enhancement of triphenylmethane dye and improve the brightness of purple; sodium chloride balances the color fixing agent system and improves the color fixing effect of the color fixing agent.

[0031] Preferably, multiple dyeing can be performed in step S5.

[0032] By adopting the above technical solution, the richness of dyeing is increased, and different degrees of purple can be obtained by multiple dyeing to meet different color requirements.

[0033] Preferably, in step S5, the conditions for reducing and opening the suede microfiber base fabric are as follows:

[0034] The suede microfiber base cloth is placed in a NaCO solution with a mass fraction of 1-3%, heated to 90-100° C. and distilled for 40-60 minutes, and then washed and neutralized to a pH value of 4-7.

[0035] Preferably, the sea-island type composite fiber is spun from polyamide and acrylate as raw materials, the island component in the sea-island type composite fiber is polyamide, and the sea component is acrylate or polyethylene.

[0036] By adopting the above technical scheme, it is beneficial to carry out the reduction and fiber opening in step S5. The alkalinity of the Naco solution is moderate, and the acrylate and polyethylene are dissolved under the action of the Naco solution. At the same time, the Naco solution will not damage the polyamide and polyurethane, thereby achieving the purpose of fully removing the sea component and ensuring the subsequent dyeing effect and color fastness.

[0037] Preferably, in step S4, the polyamide accounts for 30-70% of the total weight of the polyamide and the polyurethane.

[0038] By adopting the above technical solution, the dosage of polyamide and polyurethane is optimized, so that the polyurethane forms moderate micropores in the three-dimensional network structure of the sea island fiber non-woven fabric, maintaining softness while having a good dyeing effect.

[0039] Preferably, in step S1, the needle punching weight is 200-700 g / m 2 .

[0040] By adopting the technical solution, the non-woven fabric has moderate density and is easy to dye.

[0041] In summary, this application has the following beneficial effects:

[0042] 1. The purple suede microfiber prepared by the process of the present application is evenly dyed and has high color fastness. The present application selects to use sea island fibers, and the pores between the sea island fibers can produce a capillary-like core adsorption capacity, which can have a good absorption effect on the triphenylmethane dye solution and improve the dyeing effect. At the same time, the dyeing solution is prepared by using triphenylmethane dye, acetic acid, sodium sulfate, leveling agent, diethylene glycol dibenzoate, sodium lignin sulfonate, ethanol and water to promote the absorption of dye by the suede microfiber, improve the dyeing efficiency of the suede microfiber and improve the color fastness of purple, effectively preventing the purple from fading or discoloration. DETAILED DESCRIPTION

[0043] Example

[0044] Example 1

[0045] A preparation process of a purple suede microfiber fabric comprises the following preparation steps:

[0046] S1. Prepare the sea-island composite fiber into non-woven fabric by needle punching process, and the needle punching weight is 200g / m 2 ;

[0047] S2, soaking the non-woven fabric in a 10% by mass anion active solution (sodium p-toluenesulfonate solution), taking it out, drying it, and then soaking the dried non-woven fabric in a 5% by mass polyvinyl alcohol aqueous solution, taking it out, and then heat setting it;

[0048] S3, grinding the shaped non-woven fabric to obtain suede microfiber;

[0049] S4, passing the suede microfiber through the polyurethane impregnation slurry to make it fully impregnated, and then passing it through a 20% dimethylamide aqueous solution at a temperature of 25°C to solidify the polyurethane and form pores, and then washing and drying to obtain a suede microfiber base fabric; the polyurethane impregnation slurry is obtained by mixing the following raw materials by weight:

[0050] Polyurethane 0.15Kg (molecular weight of polyurethane 20000)

[0051] N,N-Dimethylformamide 0.8Kg

[0052] Foam leveler 0.005Kg (polysiloxane-olefin oxide block copolymer)

[0053] Cell regulator 0.01Kg (calcium sulfate);

[0054] S5, reducing the weight of the suede microfiber base fabric and dyeing it, using a padder to completely immerse the ground suede microfiber base fabric into a dyeing solution, the dyeing solution comprising 0.06 kg of triphenylmethane dye, 0.03 kg of acetic acid, 0.03 kg of sodium sulfate, 0.2 kg of leveling agent (polyethyleneimine), 0.01 kg of diethylene glycol dibenzoate, 0.02 kg of sodium lignin sulfonate, 0.2 kg of ethanol and 0.4 kg of water;

[0055] The conditions for reducing and opening the suede microfiber base fabric are as follows:

[0056] Put the suede microfiber base cloth into a 1% NaCO solution, heat it to 90℃ and boil it for 40min, then wash and neutralize it to pH 4;

[0057] S6. Soak the dyed suede microfiber base fabric in a color fixing agent at a temperature of 60° C. and then dry to obtain a purple suede microfiber fabric.

[0058] The color fixing agent includes 20 g / L sodium chloride, 15 g / L silicone oil, 20 g / L acetic acid and 20 g / L tobothidine.

[0059] The island component of the sea-island composite fiber is polyamide, and the sea component is acrylic.

[0060] In step S4, the polyamide accounts for 30% of the total weight of the polyamide and the polyurethane.

[0061] The difference between Example 2-3 and Example 1 is that the amount, type and experimental parameters of some raw materials used in preparing the purple suede microfiber fabric are different. The specific differences are shown in Table 1:

[0062] Table 1 Amount, type and experimental parameters of some raw materials for preparing purple suede microfiber fabric

[0063]

[0064]

[0065] Example 4

[0066] A preparation process for a purple suede microfiber fabric. The difference between the present application and Example 1 is that the leveling agent is obtained by mixing 0.11 kg of polyethylene imine, 0.03 kg of octadecyl isocyanate and 0.06 kg of polyoxyethylene stearate in a weight ratio of 10:3:6, and the remaining experimental steps, raw materials and experimental parameters are consistent with those in Example 1.

[0067] Example 5

[0068] A preparation process of a purple suede microfiber fabric. The difference between this embodiment and embodiment 1 is that the leveling agent is obtained by mixing 0.10 kg of polyethylene imine, 0.04 kg of octadecyl isocyanate and 0.05 kg of polyoxyethylene stearate in a weight ratio of 12:5:6, and the remaining experimental steps, raw materials and experimental parameters are consistent with those in embodiment 1.

[0069] Example 6

[0070] A preparation process for a purple suede microfiber fabric. The difference between this embodiment and embodiment 1 is that in step S6, the color fixing agent includes sodium chloride with a concentration of 30 g / L, silicone oil with a concentration of 18 g / L, acetic acid with a concentration of 30 g / L, and tobothidine with a concentration of 30 g / L, and the remaining experimental steps, raw materials, and experimental parameters are consistent with those in embodiment 1.

[0071] Example 7

[0072] A preparation process of a purple suede microfiber fabric. The difference between this embodiment and embodiment 1 is that the suede microfiber base fabric is placed in a sodium hydroxide solution with a mass fraction of 1%, the temperature is raised to 90°C and distilled for 40 minutes, and then washed and neutralized to pH 4. The remaining experimental steps, raw materials and experimental parameters are consistent with those in embodiment 1.

[0073] Example 8

[0074] A preparation process of a purple suede microfiber fabric. The difference between this embodiment and embodiment 1 is that the sea-island type composite fiber is spun from polyamide and acrylate as raw materials, the island component in the sea-island type composite fiber is polyamide, and the sea component is polyethylene, and the remaining experimental steps, raw materials and experimental parameters are consistent with those in embodiment 1.

[0075] Comparative Example

[0076] Comparative Example 1

[0077] A preparation process of a purple suede microfiber fabric. The difference between this comparative example and Example 1 is that ordinary microfibers are used instead of composite sea-island fibers, and the remaining experimental steps, raw materials and experimental parameters are consistent with Example 1.

[0078] Comparative Example 2

[0079] A preparation process of a purple suede microfiber fabric. The difference between this comparative example and Example 1 is that the anion active solution is replaced by water in step S2, and the other experimental steps, raw materials and experimental parameters are consistent with those in Example 1.

[0080] Comparative Example 3

[0081] A preparation process of a purple suede microfiber fabric. The difference between this comparative example and Example 1 is that step S6 is omitted, and the remaining experimental steps, raw materials and experimental parameters are consistent with those of Example 1.

[0082] The difference between Comparative Examples 4-8 and Example 1 is that the dosage of some components in the dyeing solution is 0, as shown in Table 2:

[0083] Table 2 Dosage of some components in the dyeing solution of Comparative Examples 4-8

[0084]

[0085] Comparative Example 9

[0086] A preparation process of a purple suede microfiber fabric. The difference between this comparative example and Example 1 is that in step S1, the sea-island type composite fiber is woven into cloth through a loom, and the remaining experimental steps, raw materials and experimental parameters are consistent with Example 1.

[0087] Performance testing

[0088] The purple suede microfiber fabrics prepared in Examples 1-8 and Comparative Examples 1-9 were tested for color fastness to sunlight, color fastness to perspiration, color fastness to washing, and color fastness to rubbing.

[0089] Detection method / test method Color comparison: Compare the purple suede microfiber fabrics obtained in Examples 1-8 and Comparative Examples 1-9 with the color sample to observe whether there is a color difference. If there is a difference, it is unqualified.

[0090] Light fastness: refer to GB / T8427-1998 "Textiles - Tests for colour fastness - Colour fastness to artificial light: Xenon arc fading lamp";

[0091] Color fastness to perspiration: refer to GB / T3922-1995 "Textiles - Tests for color fastness - Color fastness to perspiration";

[0092] Color fastness to washing: refer to GB / T 3921.3-1997 Textiles - Tests for color fastness - Color fastness to washing: Test 3";

[0093] Color fastness to rubbing: refer to GB / T 3920-1997 "Textiles - Tests for color fastness - Color fastness to rubbing". The experimental data are shown in Table 3:

[0094] Table 3 Experimental data of Examples 1-9 and Comparative Examples 1-9

[0095]

[0096]

[0097] It can be seen from Examples 1-8 and Comparative Examples 1-9 in combination with Table 3 that the purple suede microfiber prepared by the preparation process of the present application has good color effect and color fastness, and can be used for a long time without fading or discoloration.

[0098] By comparing Example 1 with Comparative Example 1, the color dyed in Comparative Example 1 is unqualified, indicating that the color fastness of the purple suede microfiber can be greatly improved by adopting the sea island fiber through the process of the present application.

[0099] Compared with Example 1 and Comparative Example 2, the color fastness to washing and the color fastness to rubbing in Comparative Example 2 are not as good as those in Example 1. By using an anionic active solvent in step S2, it is beneficial to sanding, easy to dye, and can improve the color fastness of the purple suede microfiber.

[0100] Compared with Example 1 and Comparative Example 3, the color fastness to sunlight, color fastness to perspiration, color fastness to washing and color fastness to rubbing in Comparative Example 3 are not as good as those in Example 1, indicating that the color fastness of the purple suede microfiber can be further improved by the color fixing agent and color fixing step in the present application.

[0101] Compared with Example 1 and Comparative Examples 4-8, the dyed colors in Comparative Examples 4 and 6 are unqualified, and the color fastness to sunlight, color fastness to sweat, color fastness to washing and color fastness to rubbing in Comparative Examples 5, 7-8 are not as good as those in Example 1, indicating that the present application prepares a dyeing solution by combining triphenylmethane dye, acetic acid, sodium sulfate, a leveling agent, diethylene glycol dibenzoate, sodium lignin sulfonate, ethanol and water, and then dyes the suede microfiber with the dyeing solution, which is beneficial to improving the color fastness of the purple suede microfiber.

[0102] Compared with Example 1 and Comparative Example 9, the dyed color in Comparative Example 9 is unqualified, which indicates that the dyeing efficiency of the non-woven fabric formed by needle punching is better in the subsequent dyeing and it is not easy to fade.

[0103] Compared with Example 4-5, the color fastness to sunlight, color fastness to perspiration and color fastness to washing in Example 4-5 are all improved. By preparing a leveling agent with polyethylene imine, octadecyl isocyanate and polyoxyethylene stearate in a specific proportion, it is beneficial to improve the color fastness of the purple suede microfiber.

[0104] Compared with Example 7, the color fastness to sunlight, color fastness to perspiration, color fastness to washing and color fastness to rubbing in Example 7 are not as good as those in Example 1, indicating that the use of Naco solution to reduce the amount of suede microfiber base cloth and open the fibers is beneficial to improving the color fastness of the purple suede microfiber.

[0105] This specific embodiment is merely an explanation of the present application and is not a limitation of the present application. After reading this specification, those skilled in the art may make modifications to the present embodiment without any creative contribution as needed, but such modifications are protected by the patent law as long as they are within the scope of the claims of the present application.

Claims

1. A preparation process of a purple suede microfiber fabric, characterized in that: The method comprises the following preparation steps: S1. preparing a non-woven fabric by needle punching the sea-island composite fiber; S2, soaking the non-woven fabric in a 10-20% by mass anion active solution, taking it out, drying it, and then soaking the dried non-woven fabric in a 5-10% by mass polyvinyl alcohol aqueous solution, taking it out, and then heat setting it; S3, grinding the shaped non-woven fabric to obtain suede microfiber; S4, passing the suede microfiber through the polyurethane impregnation slurry to make it fully impregnated, and then passing it through an aqueous solution of dimethylamide with a concentration of 20-30% at a temperature of 25-30° C. to solidify the polyurethane and form pores, and then washing and drying to obtain a suede microfiber base cloth; S5, reducing and opening the suede microfiber base fabric, and dyeing the suede microfiber base fabric, using a padder to completely immerse the ground suede microfiber base fabric into a dyeing solution, wherein the dyeing solution includes 6-10 parts of triphenylmethane dye, 3-6 parts of acetic acid, 3-5 parts of sodium sulfate, 20-25 parts of a leveling agent, 10-15 parts of diethylene glycol dibenzoate, 2-4 parts of sodium lignin sulfonate, 20-30 parts of ethanol, and 40-60 parts of water; S6, soaking the dyed suede microfiber base fabric in a color fixing agent at a temperature of 60-80° C., and then drying to obtain a purple suede microfiber fabric; Each portion of the leveling agent comprises polyethyleneimine, octadecyl isocyanate and polyoxyethylene stearate in a weight ratio of (10-12): (3-5): 6; In step S6, the color fixing agent includes sodium chloride with a concentration of 20-30 g / L, silicone oil with a concentration of 15-18 g / L, acetic acid with a concentration of 20-30 g / L, and tobotidine with a concentration of 20-30 g / L; In step S5, the conditions for reducing and opening the suede microfiber base fabric are as follows: Put the suede microfiber base cloth into a 1-3% NaCO solution, heat it to 90-100℃ and distill it for 40-60min, then wash and neutralize it to pH 4-7; The anion active liquid is one of a sulfonate solution, a sulfate ester solution or a phosphate solution.

2. The preparation process of a purple suede microfiber fabric according to claim 1, characterized in that: The polyurethane impregnation slurry is obtained by mixing the following raw materials in parts by weight: Polyurethane 15-20 parts 80-100 parts of N,N-dimethylformamide 0.5-2 parts of foam leveling agent 1-5 parts of cell regulator.

3. The preparation process of a purple suede microfiber fabric according to claim 1, characterized in that: In step S5, dyeing may be performed multiple times.

4. The preparation process of a purple suede microfiber fabric according to claim 1, characterized in that: In step S1, the needle punching weight is 200-700 g / m².

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