Preparation method of high color fastness suede base cloth added with PA6 / PET powder filler

Abstract

The application provides a preparation method of high-color-fastness suede base cloth added with PA6 / PET powder filler, the base cloth is prepared by blending PA / PET as island phase and PE as sea phase, PA6 / PET powder is used as the filler, and the base cloth is impregnated by using a wet impregnation process, and the impregnation slurry used for impregnation comprises, by mass fraction, 100 parts of polyurethane resin, 30-40 parts of PA6 / PET powder, 0.5-1.5 parts of a cell regulator, and 160-180 parts of DMF. The prepared suede microfiber synthetic leather has high color migration fastness, high light fastness, excellent sweat stain fastness and excellent water color fastness, and effectively improves the phenomenon of uneven color on the ordinary suede dyeing base and poor color fastness.

Description

[0001] The application relates to the technical field of synthetic leather preparation, in particular to a preparation method of high-color-fastness suede base cloth added with PA6 / PET powder filler.

[0002] With the rapid development of the current national economy, various synthetic leather products are emerging in an endless stream, and people have higher requirements for the products while loving the synthetic leather products. People often pay more attention to products with unique styles, novel styles and bright colors.

[0003] Under the impetus of the development of today's society and consumer demand, synthetic leather products are increasingly developing towards diversification and functionalization. There are not a few suede dyeing synthetic leather products on the market, but most of them are dark or dull colors, and the ordinary suede dyeing base often has the problems of uneven coloring and poor color fastness during the production of suede synthetic leather, so it is a challenge to produce suede synthetic leather with bright colors and high color fastness.

[0004] In view of this, the present inventors have conducted in-depth research on the above problems, and thus the present application is produced.

[0005] The application provides a preparation method of high-color-fastness suede base cloth added with PA6 / PET powder filler, and the prepared suede base cloth has high color migration fastness, high light fastness, excellent sweat stain fastness and excellent water color fastness, effectively improving the problems of uneven coloring and poor color fastness of ordinary suede dyeing base; and the prepared high-color-fastness suede base cloth can meet the use requirements of sofa leather, furniture leather, bag leather and shoe leather.

[0006] The application is implemented in the following manner: a preparation method of high-color-fastness suede base cloth added with PA6 / PET powder filler, wherein the base cloth is prepared by mixing PA / PET as island phase and PE as sea phase, PA6 / PET powder is used as filler, and a wet dipping process is used for dipping the base cloth, and the dipping slurry used for dipping includes the following components in parts by mass:

[0007]

[0008]

[0009] Further, the powder fineness of the PA6 / PET powder is 1000-1500 mesh.

[0010] Further, the cell regulator is a strong hydrophobic non-ionic surfactant.

[0011] ​​​Further, the preparation method of the impregnated slurry is as follows: 100 parts of polyurethane resin, 30-40 parts of PA6 / PET powder, 0.5-1.5 parts of cell regulator, and 160-180 parts of DMF are added into a reaction kettle for stirring, the stirring speed of the stirring machine is controlled at 1300-2300 r / min, the time is 40-60 min, and the viscosity is controlled at 1000-3000 cps.

[0012] Further, the preparation method of the base cloth comprises:

[0013] PA / PET chips and polyethylene PE are mixed according to weight proportions (65-70):(30-35), and then island fibers are prepared through a spinning process; the island fibers are manufactured into non-woven fabric through a needling process, and the needle density is 1750-2250 C / cm 2 during the needling process.

[0014] The non-woven fabric after needling is heated through a 7-stage oven with the temperatures being set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5 m / min, the non-woven fabric after heat setting is cooled through a cooling roller with a temperature of 8-18℃, the thickness and the gram weight of the non-woven fabric are set, and the required base cloth is obtained.

[0015] Further, the impregnated base cloth is subjected to coagulation and washing treatment to obtain an impregnated base cloth; the impregnated base cloth is subjected to fibrillation treatment to obtain a fibrillated base cloth; the fibrillated base cloth is dried, oiled, kneaded, skived, sanded and dyed to obtain a suede base cloth; and the suede base cloth is subjected to dry lamination to obtain a high-color-fastness suede microfiber synthetic leather added with PA6 / PET powder.

[0016] The present application has the following advantages:

[0017] 1. PA6 / PET powder is used as a filler to reduce the proportion of polyurethane resin in the whole impregnated slurry formula system, the proportion of polyurethane resin in the formula system is about 35.5-38.4% before the filler is added, and the proportion of polyurethane resin in the formula system is about 31.1-34.4% after the filler is added; since polyurethane resin is not easy to color compared with fibers, reducing the proportion of polyurethane resin in the impregnated slurry, i.e. reducing the proportion of the part not easy to color, helps to improve the overall dyeing performance, improves the problem of uneven dyeing of the base, and reduces the cost.

[0018] 2. In the impregnation slurry formulation, since polyurethane resin does not contain dyeing groups, it does not bind firmly with dye molecules after subsequent dyeing and finishing, resulting in poor color fastness and problems with resin dyeing quality. Adding PA6 / PET powder as a filler to the impregnation slurry makes the base fabric easier to dye in the later dyeing and finishing process after impregnation, giving it good dyeing performance and thus improving the color fastness of the entire product system.

[0019] 3. In Example 1, the combination of PA island phase and PA6 powder filler has a relatively short molecular chain structure and good performance. It has good dyeing performance. When acid dye is used for dyeing, the dyeing mechanism of acid dye is to combine with the terminal amino group of PA6 through strong ionic bond or electrostatic attraction to obtain a bright color with excellent color fastness, improve the dyeing performance of polyurethane resin, and make the color of polyurethane resin and island fiber more consistent.

[0020] 4. In Example 2, the combination of PET island phase and PET powder filler is used. Because PET has a compact molecular structure, high crystallinity, strong hydrophobicity, and high negative potential, but lacks functional groups for binding with ionic dyes, subsequent dyeing and finishing stages require high-temperature, high-pressure dyeing with disperse dyes. High temperature causes the island fibers to "thermally expand," thereby increasing the vibrational frequency of the island fiber molecules, increasing the amorphous region of the island fibers, widening the gaps, and relaxing the structure. Therefore, adding PET powder filler to the impregnation slurry facilitates dye diffusion and penetration into the island fiber interior, improving the dyeing rate, enhancing the dyeing performance of the polyurethane resin system, and making it more uniform and easier to color.

Detailed Implementation Methods

[0021] Based on the embodiments of this invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this invention.

[0022] Example 1

[0023] A method for preparing a high colorfastness suede base fabric with added PA6 powder, comprising: a base fabric prepared by blending PA as the island phase and PE as the marine phase; PA6 powder as the filler; and a wet impregnation process for impregnating the base fabric. The impregnation slurry, by weight, comprises:

[0024]

[0025]

[0026] The proportion of the polyurethane resin in the whole impregnation slurry formulation system is reduced by using PA6 powder as filler. The proportion of the polyurethane resin in the formulation system is about 35.5-38.4% before adding the filler and about 31.1-34.4% after adding the filler. Since the polyurethane resin is not easy to color compared with the fiber, reducing the proportion of the polyurethane resin in the impregnation slurry is equivalent to reducing the proportion of the part that is not easy to color, which helps to improve the overall dyeing performance, improve the problem of uneven dyeing of the belt, and reduce the cost.

[0027] In this embodiment, the combination of PA island phase and PA6 powder filler is used. Since the molecular chain structure of PA6 is relatively short, the performance is relatively good, and the dyeing performance is good. Subsequently, acid dyes are used for dyeing and finishing. The acid dye dyeing mechanism combines with the amine group at the end of PA6 through strong ionic bond or electrostatic attraction to obtain bright color with excellent color fastness, improve the dyeing performance of the polyurethane resin, and make the color of the polyurethane resin and the island fiber more consistent.

[0028] In this embodiment, the polyurethane resin is a polyether type polyurethane resin. The polyether type polyurethane resin TDD-60S produced by Shandong Tongtaida New Material Technology Co., Ltd. is used. The soft, toluene extraction resistant, high strength, high resilience, excellent hydrolysis resistance, good low temperature performance, good hand feeling, good dyeing performance, and high color fastness.

[0029] In this embodiment, the powder fineness of the PA6 powder is 1000-1500 mesh. PA6 is a kind of high molecular compound. PA6 powder with a powder fineness of more than 1500 mesh is easy to damage the machine due to a large amount of heat generated during production, and it is difficult to achieve a fineness of more than 1500 mesh; PA6 with a powder fineness of less than 1000 mesh is difficult to mix uniformly and completely with the polyurethane resin when preparing the impregnation slurry, and the impregnation is not sufficient, most of the powder is taken away by the scraper, it is difficult to ensure that the filler is uniformly filled in the belt, and it is difficult to ensure the process stability.

[0030] In this embodiment, the cell regulator is a strong hydrophobic non-ionic surfactant

[0031] In this embodiment, the preparation method of the impregnation slurry is as follows: 100 parts of polyether type polyurethane, 30-40 parts of PA6 powder, 0.5-1.5 parts of cell regulator, and 160-180 parts of DMF are added into a reaction kettle for stirring. The stirring speed of the stirring machine is controlled at 1300-2300 r / min, the time is 40-60 min, and the viscosity is controlled at 1000-3000 cps. Preferably, the stirring time is 50 min.

[0032] In this embodiment, the preparation method of the base fabric includes: mixing PA chips and polyethylene (PE) in a weight ratio of (65-70):(30-35) and then obtaining island-island fibers through a spinning process; manufacturing nonwoven fabric from the island-island fibers through a needle-punching process, wherein the needle density during the needle-punching process is 1750-2250 C / cm. 2 Preferably, the ratio of PA chips to polyethylene (PE) is 65:35.

[0033] In this embodiment, the needle-punched nonwoven fabric is heated in a 7-stage oven with gradient temperatures set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃, and 130-140℃ respectively. The production speed is controlled at 6.0-8.5 m / min. After heat setting, the nonwoven fabric is cooled by cooling rollers at 8-18℃ to set the thickness and basis weight. The density of the nonwoven fabric after setting ranges from 0.33 to 0.38; the basis weight is 600-800 g / m². 2 The desired base fabric is obtained.

[0034] In this embodiment, the wet impregnation process uses two impregnation tanks for impregnation, two coagulation tanks (pre-coagulation tank and main coagulation tank) with a sugar content of 18-22T and a temperature of 28-32℃; 12 water washing tanks are used for fabric threading in a "U" shape, with circulating water washing and a machine speed of 4.5-6.5m / min to obtain the impregnated base fabric.

[0035] In this embodiment, the impregnated base fabric is coagulated and washed to obtain an impregnated base fabric; the impregnated base fabric is then split to obtain a split base fabric; the split base fabric is dried and then oiled, kneaded, split, sanded, and dyed to obtain a suede base fabric.

[0036] In this embodiment, a high color fastness suede microfiber synthetic leather with added PA6 powder filler is obtained by dry bonding of suede base fabric.

[0037] In this embodiment, the fiber opening process is a toluene reduction process, consisting of 10 tanks: tanks 1-7 are toluene tanks at a temperature of 85°C; tanks 8-10 are water washing tanks at a temperature of 99-102°C; the machine speed is 8-10 m / min, and the opened island microfiber base fabric is obtained.

[0038] The high colorfastness suede base fabric prepared in this embodiment can meet the usage requirements of sofa leather, furniture leather, bag leather, and shoe leather.

[0039] The following describes the beneficial technical effects of the suede microfiber synthetic leather prepared by the method of adding PA6 powder to a high color fastness suede base fabric in this embodiment through several experimental and control groups.

[0040] Experimental Group 1

[0041] Step one: PA chips, polyethylene PE mixed by weight fraction 65:35 after spinning process to get island fibers; the island fibers are manufactured into non-woven fabric by needle punching process; the needle punched non-woven fabric is heated by 7-stage oven gradient, the temperature is set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat set non-woven fabric is cooled by 8-18℃ cooling roller to realize the setting of non-woven fabric thickness and gram weight, and the required base fabric is prepared;

[0042] Step two: 100 parts of polyether polyurethane, 35 parts of PA6 powder with 1500 mesh, 1 part of cell regulator, 170 parts of DMF are added into the reaction kettle for stirring, the stirring machine speed is controlled at 1300-2300r / min, the time is 50min, the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by wet impregnation process to prepare the impregnated base fabric;

[0043] Step three: the impregnated base fabric is treated by coagulation, washing, fibrillation, drying, oiling, rubbing, skinning, grinding and dyeing to obtain suede base fabric; the suede base fabric is obtained by dry lamination to obtain suede super fiber synthetic leather added with PA6 powder filler.

[0044] Experimental group two

[0045] Step one: PA chips, polyethylene PE mixed by weight fraction 65:35 after spinning process to get island fibers; the island fibers are manufactured into non-woven fabric by needle punching process; the needle punched non-woven fabric is heated by 7-stage oven gradient, the temperature is set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat set non-woven fabric is cooled by 8-18℃ cooling roller to realize the setting of non-woven fabric thickness and gram weight, and the required base fabric is prepared;

[0046] Step two: 100 parts of polyether polyurethane, 35 parts of PA6 powder with 1500 mesh, 1 part of cell regulator, 170 parts of DMF are added into the reaction kettle for stirring, the stirring machine speed is controlled at 1300-2300r / min, the time is 50min, the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by wet impregnation process to prepare the impregnated base fabric;

[0047] Step three: the dipped base cloth is treated by coagulation, washing, fiber opening, drying, oiling, rubbing, peeling, sanding and dyeing and finishing to obtain suede leather base cloth; the suede leather base cloth is subjected to dry lamination to obtain suede microfiber synthetic leather added with PA6 powder filler.

[0048] Experiment group three

[0049] Step one: island fibers are prepared by mixing PA chips and polyethylene PE at a weight ratio of 65:35 and through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the needle-punched non-woven fabric is subjected to gradient heating through a 7-stage oven, the temperatures are set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5 m / min, and the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0050] Step two: 100 parts of polyether polyurethane, 40 parts of PA6 powder with a mesh of 1500, 1.5 parts of cell regulator and 180 parts of DMF are added into a reaction kettle for stirring, the stirring speed is controlled at 1300-2300 r / min, the time is 50 min, and the viscosity is controlled at 1000-3000 cps, thereby obtaining dipping slurry; the base cloth is dipped by using a wet dipping process to obtain dipped base cloth;

[0051] Step three: the dipped base cloth is treated by coagulation, washing, fiber opening, drying, oiling, rubbing, peeling, sanding and dyeing and finishing to obtain suede leather base cloth; the suede leather base cloth is subjected to dry lamination to obtain suede microfiber synthetic leather added with PA6 powder filler.

[0052] Experiment group four

[0053] Step one: island fibers are prepared by mixing PA chips and polyethylene PE at a weight ratio of 65:35 and through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the needle-punched non-woven fabric is subjected to gradient heating through a 7-stage oven, the temperatures are set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5 m / min, and the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0054] Step two: 100 parts of polyether polyurethane, 35 parts of 1200 mesh PA6 powder, 1 part of cell regulator, 170 parts of DMF were added to the reaction kettle for stirring, the stirring speed was controlled at 1300-2300 r / min, the time was 50 min, and the viscosity was controlled at 1000-3000 cps, to prepare the impregnation slurry; the base cloth was impregnated by using the wet impregnation process to prepare the impregnated base cloth;

[0055] Step three: the impregnated base cloth was subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain the suede base cloth; the suede base cloth was subjected to dry facing to obtain the suede microfiber synthetic leather added with PA6 powder filler.

[0056] Experimental group five

[0057] Step one: island fibers were prepared by mixing PA chips and polyethylene PE at a weight ratio of 65:35 and then by a spinning process; the island fibers were manufactured into non-woven fabric by needling process; the needled non-woven fabric was subjected to gradient heating through a 7-stage oven, the temperatures were set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed was controlled at 6.0-8.5 m / min, and the needled non-woven fabric was cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0058] Step two: 100 parts of polyether polyurethane, 35 parts of 1200 mesh PA6 powder, 1 part of cell regulator, 170 parts of DMF were added to the reaction kettle for stirring, the stirring speed was controlled at 1300-2300 r / min, the time was 50 min, and the viscosity was controlled at 1000-3000 cps, to prepare the impregnation slurry; the base cloth was impregnated by using the wet impregnation process to prepare the impregnated base cloth;

[0059] Step three: the impregnated base cloth was subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain the suede base cloth; the suede base cloth was subjected to dry facing to obtain the high color fastness suede microfiber synthetic leather added with PA6 powder filler.

[0060] Comparative group one

[0061] Step one: island fibers are prepared by spinning process after mixing PA chips and polyethylene PE with weight ratio of 65:35; non-woven fabric is manufactured by needle punching process; the needle punched non-woven fabric is heated by 7-stage ovens with temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat set non-woven fabric is cooled by cooling roller at 8-18℃ to realize the setting of non-woven fabric thickness and gram weight, and the required base fabric is prepared;

[0062] Step two: 100 parts of polyether polyurethane, 1 part of cell regulator, 170 parts of DMF are added into a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50 min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by wet impregnation process, and the impregnated base fabric is prepared;

[0063] Step three: the impregnated base fabric is treated by coagulation, washing, fibrillation, drying, oiling, rubbing, skiving, buffing and dyeing, and the suede leather base fabric is obtained; the suede leather base fabric is obtained by dry lamination to obtain suede microfiber synthetic leather.

[0064] Comparative group two

[0065] Step one: island fibers are prepared by spinning process after mixing PA chips and polyethylene PE with weight ratio of 65:35; non-woven fabric is manufactured by needle punching process; the needle punched non-woven fabric is heated by 7-stage ovens with temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat set non-woven fabric is cooled by cooling roller at 8-18℃ to realize the setting of non-woven fabric thickness and gram weight, and the required base fabric is prepared;

[0066] Step two: 100 parts of polyether polyurethane, 35 parts of 800 mesh PA6 powder, 1 part of cell regulator, 170 parts of DMF are added into a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50 min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by wet impregnation process, and the impregnated base fabric is prepared;

[0067] Step three: the impregnated base fabric is treated by coagulation, washing, fibrillation, drying, oiling, rubbing, skiving, buffing and dyeing, and the suede leather base fabric is obtained; the suede leather base fabric is obtained by dry lamination to obtain suede microfiber synthetic leather added with PA6 powder filler.

[0068] Comparative Group Three

[0069] Step One: PA slices and polyethylene PE are mixed in a weight ratio of 65:35, and then island fibers are prepared through a spinning process; the island fibers are manufactured into non-woven fabric through a needling process; the needled non-woven fabric is heated through a 7-stage oven with temperatures set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, and the production speed is controlled at 6.0-8.5m / min; the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃ to achieve the setting of the thickness and gram weight of the non-woven fabric, and the required base fabric is prepared;

[0070] Step Two: 100 parts of polyether polyurethane, 35 parts of PA66 powder with a mesh of 1500, 1 part of cell regulator, and 170 parts of DMF are added to a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated through a wet impregnation process, and the impregnated base fabric is prepared;

[0071] Step Three: the impregnated base fabric is subjected to coagulation, washing, fibrillation, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain suede base fabric; the suede base fabric is subjected to dry lamination to obtain suede microfiber synthetic leather added with PA66 powder filler.

[0072] Table 1: Color fastness test results of suede microfiber synthetic leather prepared in each experimental group and comparative group

[0073]

[0074]

[0075] According to Table 1, the color fastness of suede microfiber synthetic leather added with PA6 powder filler (experimental groups one to five), suede microfiber synthetic leather without PA6 powder filler (comparative group one), suede microfiber synthetic leather added with low-mesh PA6 powder filler (comparative group two), and suede microfiber synthetic leather added with PA66 powder filler (comparative group three) is tested under different conditions.

[0076] 1. The color fastness of suede microfiber synthetic leather produced in experimental groups one to five under various different conditions is more excellent, and has better color migration fastness, light fastness, perspiration color fastness, and water color fastness.

[0077] 2、The PVC color migration grade, sweat fastness, rubbing fastness, and sunlight fastness of the suede microfiber synthetic leather produced by the comparative group one are only 2-3 levels, and there is a serious staining phenomenon in the water fastness test. It is shown that in the dipping slurry formula without adding PA6 powder filler, the proportion of polyurethane resin is high. Since the polyurethane resin does not contain dyeing groups, etc., the combination with dye molecules after subsequent dyeing and finishing is not firm, the color fastness is poor, and there is a problem of poor quality and effect of resin coloring.

[0078] 3、The PVC color migration grade, sweat fastness, rubbing fastness of the suede microfiber synthetic leather produced by the comparative group two are only 2-3 levels, and there is a slight staining phenomenon in the water fastness test. Since the PA6 powder particles with 800 mesh powder fineness are relatively large, they cannot be uniformly and completely mixed with polyurethane resin when preparing the dipping slurry. It can be observed by naked eye that the dipping is not sufficient, and most of the powder is taken away by the scraper, so it is difficult to ensure that the PA6 powder filler is uniformly filled in the base cloth, and it is difficult to ensure the process stability. It is further shown that using PA6 powder filler with high mesh number in the dipping slurry helps to improve the dyeing performance of the base cloth, so that the dipped base cloth is more easily dyed in the dyeing and finishing process.

[0079] 4、The PVC color migration grade, sweat fastness, rubbing fastness of the suede microfiber synthetic leather produced by the comparative group three are only 2-3 levels, and there is a serious staining phenomenon in the water fastness test. Since PA66 needs high temperature dyeing, it is difficult to dye, it is not easy to color, and the color fastness is not very good.

[0080] Example two

[0081] A method for preparing a high color fastness suede leather base cloth by adding PET powder. The base cloth is prepared by blending PET as island phase and PE as sea phase. PET powder is used as filler, and the base cloth is dipped by wet dipping process. The dipping slurry used for dipping includes, by mass fraction:

[0082]

[0083] PET powder is used as filler to reduce the proportion of polyurethane resin in the whole dipping slurry formula system. Before adding the filler, the polyurethane resin accounts for about 35.5-38.4% of the formula system, and after adding the filler, the polyurethane resin accounts for about 31.1-34.4% of the formula system. Since polyurethane resin is not easy to color compared with fiber, reducing the proportion of polyurethane resin in the dipping slurry is equivalent to reducing the proportion of the part that is not easy to color, which helps to improve the overall dyeing performance and improve the problem of uneven dyeing of the base. At the same time, the cost is reduced.

[0084] In this embodiment, the combination of PET island phase + PET powder filler, due to the characteristics of PET, such as tight molecular structure, high crystallinity, strong hydrophobicity, high negative potential, and the lack of functional groups combined with ionic dyes, the subsequent dyeing and finishing stage needs to use disperse dye high temperature and high pressure dyeing. High temperature can make the island fiber "thermal expansion", thereby increasing the vibration frequency of the island fiber molecules, increasing the amorphous region of the island fiber, increasing the gap, and relaxing the structure, so adding PET powder filler in the impregnation slurry is beneficial to the diffusion of the dye and into the island fiber, which can improve the dyeing rate and improve the dyeing performance of the polyurethane resin system, making it more uniform and easy to color.

[0085] In this embodiment, the polyurethane resin is a polyether type polyurethane resin. The polyether type polyurethane resin TDD-60S produced by Shandong Tongtaida New Material Technology Co., Ltd. is used, which is soft, resistant to toluene extraction, high strength, high resilience, excellent hydrolysis resistance, good low temperature performance, good hand feeling, good dyeing performance and high color fastness.

[0086] In this embodiment, the powder fineness of the PET powder is 1000-1500 mesh. PET powder with a powder fineness of more than 1500 mesh is prone to damage the machine due to the generation of a large amount of heat during production, and it is difficult to achieve a fineness of more than 1500 mesh; PET powder with a powder fineness of less than 1000 mesh is difficult to mix uniformly and completely with the polyurethane resin when preparing the impregnation slurry, and the impregnation is not sufficient, most of the powder is taken away by the scraper, and it is difficult to ensure that the filler is uniformly filled in the beater, and it is difficult to ensure the process stability.

[0087] In this embodiment, the cell regulator is a strong hydrophobic non-ionic surfactant, and the HS-8I type cell regulator produced by Minglong Chemical Co., Ltd. is selected.

[0088] In this embodiment, the preparation method of the impregnation slurry is: adding 100 parts of polyether type polyurethane, 30-40 parts of PET powder, 0.5-1.5 parts of cell regulator, and 160-180 parts of DMF into a reaction kettle for stirring, the stirring speed is controlled at 1300-2300 r / min, the time is 40-60 min, and the viscosity is controlled at 1000-3000 cps. Preferably, the stirring time is 50 min.

[0089] In this embodiment, the preparation method of the base cloth includes: mixing PET chips and polyethylene PE according to the weight ratio of (65-70):(30-35) to prepare island fibers by a spinning process; and manufacturing a non-woven fabric by needling the island fibers, and the needle density in the needling process is 1750-2250 C / cm 2 . Preferably, the ratio of the parts of PET chips and polyethylene PE is 65:35.

[0090] In this embodiment, the needle-punched nonwoven fabric is heated in a 7-stage oven with gradient temperatures set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃, and 130-140℃ respectively. The production speed is controlled at 6.0-8.5 m / min. After heat setting, the nonwoven fabric is cooled by cooling rollers at 8-18℃ to set the thickness and basis weight. The density of the nonwoven fabric after setting ranges from 0.33 to 0.38; the basis weight is 600-800 g / m². 2 The desired base fabric is obtained.

[0091] In this embodiment, the wet impregnation process uses two impregnation tanks for impregnation, two coagulation tanks with a sugar content of 18-22T and a temperature of 28-32℃; 12 water washing tanks are used for fabric threading in a "U" shape, with circulating water washing and a machine speed of 4.5-6.5m / min to obtain the impregnated base fabric.

[0092] In this embodiment, the impregnated base fabric is coagulated and washed to obtain an impregnated base fabric; the impregnated base fabric is split to obtain a split base fabric; the split base fabric is dried and oiled, rubbed, split, sanded, and dyed to obtain a suede base fabric; the suede base fabric is dry-laminated to obtain a high color fastness suede microfiber synthetic leather with added PET powder.

[0093] In this embodiment, the fiber opening process is a toluene reduction process, consisting of 10 tanks: tanks 1-7 are toluene tanks at a temperature of 85°C; tanks 8-10 are water washing tanks at a temperature of 99-102°C; the machine speed is 8-10 m / min, and the opened island microfiber base fabric is obtained.

[0094] The high colorfastness suede base fabric prepared in this embodiment can meet the usage requirements of sofa leather, furniture leather, bag leather, and shoe leather.

[0095] The following describes the beneficial technical effects of the suede microfiber synthetic leather prepared by the method of adding PET powder to a high color fastness suede base fabric in this embodiment through several experimental and control groups.

[0096] Experimental Group 1

[0097] Step one: island fibers are prepared by mixing PET chips and polyethylene PE in a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the non-woven fabric after needle punching is heated through a 7-stage oven with the temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the non-woven fabric after heat setting is cooled through a cooling roller at 8-18℃, the thickness and gram weight of the non-woven fabric are set, and the required base fabric is prepared;

[0098] Step two: 100 parts of polyether polyurethane, 35 parts of PET powder with a mesh of 1500, 1 part of cell regulator, and 170 parts of DMF are added to a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by using a wet impregnation process, and the impregnated base fabric is prepared;

[0099] Step three: the impregnated base fabric is subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain a suede base fabric; the suede base fabric is subjected to dry lamination to obtain a suede microfiber synthetic leather added with PET powder filler.

[0100] Experimental group two

[0101] Step one: island fibers are prepared by mixing PET chips and polyethylene PE in a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the non-woven fabric after needle punching is heated through a 7-stage oven with the temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the non-woven fabric after heat setting is cooled through a cooling roller at 8-18℃, the thickness and gram weight of the non-woven fabric are set, and the required base fabric is prepared;

[0102] Step two: 100 parts of polyether polyurethane, 35 parts of PET powder with a mesh of 1500, 1 part of cell regulator, and 170 parts of DMF are added to a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by using a wet impregnation process, and the impregnated base fabric is prepared;

[0103] Step three: the dipped base cloth is treated by coagulation, washing, fiber opening, drying, oiling, rubbing, peeling, sanding and dyeing and finishing to obtain suede leather base cloth; the suede leather base cloth is subjected to dry lamination to obtain suede microfiber synthetic leather added with PET powder filler.

[0104] Experiment group three

[0105] Step one: island fibers are prepared by mixing PET chips and polyethylene PE at a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needling process; the needled non-woven fabric is subjected to gradient heating through a 7-stage oven, the temperatures are set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, and the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0106] Step two: 100 parts of polyether polyurethane, 40 parts of 1500-mesh PET powder, 1.5 parts of cell regulator and 180 parts of DMF are added into a reaction kettle for stirring, the stirring speed is controlled at 1300-2300r / min, the time is 50 min, and the viscosity is controlled at 1000-3000cps, thereby obtaining dipping slurry; the base cloth is dipped by using a wet dipping process to obtain dipped base cloth;

[0107] Step three: the dipped base cloth is treated by coagulation, washing, fiber opening, drying, oiling, rubbing, peeling, sanding and dyeing and finishing to obtain suede leather base cloth; the suede leather base cloth is subjected to dry lamination to obtain suede microfiber synthetic leather added with PET powder filler.

[0108] Experiment group four

[0109] Step one: island fibers are prepared by mixing PET chips and polyethylene PE at a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needling process; the needled non-woven fabric is subjected to gradient heating through a 7-stage oven, the temperatures are set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, and the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0110] Step two: 100 parts of polyether polyurethane, 35 parts of 1200 mesh PET powder, 1 part of cell regulator, 170 parts of DMF were added into the reaction kettle for stirring, the stirring speed was controlled at 1300-2300 r / min, the time was 50 min, and the viscosity was controlled at 1000-3000 cps, to prepare the impregnation slurry; the base cloth was impregnated by using the wet impregnation process to prepare the impregnated base cloth;

[0111] Step three: the impregnated base cloth was subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skiving, buffing, dyeing and finishing to obtain the suede base cloth; the suede base cloth was subjected to dry facing to obtain the suede microfiber synthetic leather added with PET powder filler.

[0112] Experimental group five

[0113] Step one: island fibers were prepared by mixing PET chips and polyethylene PE at a weight ratio of 65:35 and then by a spinning process; the island fibers were manufactured into non-woven fabric by needling process; the needled non-woven fabric was subjected to gradient heating through a 7-stage oven, the temperatures were set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed was controlled at 6.0-8.5 m / min, and the needled non-woven fabric was cooled through a cooling roller at 8-18℃ to realize the setting of the thickness and gram weight of the non-woven fabric, thereby obtaining the required base cloth;

[0114] Step two: 100 parts of polyether polyurethane, 35 parts of 1200 mesh PET powder, 1 part of cell regulator, 170 parts of DMF were added into the reaction kettle for stirring, the stirring speed was controlled at 1300-2300 r / min, the time was 50 min, and the viscosity was controlled at 1000-3000 cps, to prepare the impregnation slurry; the base cloth was impregnated by using the wet impregnation process to prepare the impregnated base cloth;

[0115] Step three: the impregnated base cloth was subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skiving, buffing, dyeing and finishing to obtain the suede base cloth; the suede base cloth was subjected to dry facing to obtain the high color fastness suede microfiber synthetic leather added with PET powder filler.

[0116] Comparative group one

[0117] Step one: island fibers are prepared by mixing PET chips and polyethylene PE in a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the needle-punched non-woven fabric is heated through a 7-stage oven with the temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃, the thickness and gram weight of the non-woven fabric are set, and the required base fabric is prepared;

[0118] Step two: 100 parts of polyether polyurethane, 1 part of cell regulator, 170 parts of DMF are added to a reaction kettle for stirring, the stirring machine speed is controlled at 1300-2300r / min, the time is 50 min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by using a wet impregnation process, and the impregnated base fabric is prepared;

[0119] Step three: the impregnated base fabric is subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain a suede leather base fabric; the suede leather base fabric is subjected to dry lamination to obtain a suede microfiber synthetic leather.

[0120] Comparative group two

[0121] Step one: island fibers are prepared by mixing PET chips and polyethylene PE in a weight ratio of 65:35 and then through a spinning process; the island fibers are manufactured into non-woven fabric through a needle punching process; the needle-punched non-woven fabric is heated through a 7-stage oven with the temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5m / min, the heat-set non-woven fabric is cooled through a cooling roller at 8-18℃, the thickness and gram weight of the non-woven fabric are set, and the required base fabric is prepared;

[0122] Step two: 100 parts of polyether polyurethane, 1 part of cell regulator, 170 parts of DMF are added to a reaction kettle for stirring, the stirring machine speed is controlled at 1300-2300r / min, the time is 50 min, and the viscosity is controlled at 1000-3000cps, and the impregnation slurry is prepared; the base fabric is impregnated by using a wet impregnation process, and the impregnated base fabric is prepared;

[0123] Step three: the impregnated base fabric is subjected to coagulation, washing treatment, fibrillation treatment, drying, oiling, kneading, skinning, buffing, dyeing and finishing to obtain a suede leather base fabric; the suede leather base fabric is subjected to dry lamination to obtain a suede microfiber synthetic leather.

[0124] Comparative Group Three

[0125] Step One: Island fibers are prepared by mixing PET chips and polyethylene (PE) in a weight ratio of 65:35 through a spinning process; the island fibers are manufactured into non-woven fabric through a needling process; the needled non-woven fabric is heated through a 7-stage oven with temperatures set at 80-90°C, 95-105°C, 115-125°C, 125-135°C, 125-135°C, 125-135°C, and 130-140°C, respectively, and the production speed is controlled at 6.0-8.5 m / min; the heat-set non-woven fabric is cooled through a cooling roller at 8-18°C to set the thickness and gram weight of the non-woven fabric, thereby obtaining the required base fabric.

[0126] Step Two: 100 parts of polyether polyurethane, 35 parts of 600-mesh PET powder, 1 part of cell regulator, and 170 parts of DMF are added to a reaction kettle for stirring, the stirring speed is controlled at 1300-2300 r / min, the stirring time is 50 min, and the viscosity is controlled at 1000-3000 cps, thereby obtaining an impregnation slurry; the base fabric is impregnated through a wet impregnation process, thereby obtaining an impregnated base fabric.

[0127] Step Three: The impregnated base fabric is subjected to coagulation, washing, fibrillation, drying, oiling, kneading, skinning, buffing, dyeing, and finishing to obtain a suede base fabric; the suede base fabric is subjected to dry lamination to obtain a suede microfiber synthetic leather with PET powder filler.

[0128] Table 2: Color fastness test results of suede microfiber synthetic leather prepared in each experimental group and comparative group

[0129]

[0130]

[0131] According to Table 2, the color fastness of the suede microfiber synthetic leather with PET powder filler (experimental groups one to five), the suede microfiber synthetic leather without PET powder filler (comparative group one), and the suede microfiber synthetic leather with low-mesh PET powder filler (comparative groups two and three) is tested under different conditions.

[0132] 1. The suede microfiber synthetic leather produced in experimental groups one to five has more excellent color fastness under various conditions, and has better color fastness to color migration, light, perspiration, and water.

[0133] 2. Compared to Group 1, the suede microfiber synthetic leather produced in this group only achieved grades 2-3 in PVC color migration, perspiration fastness, rubbing fastness, and sunlight fastness. Furthermore, severe staining was observed in the water fastness test. This indicates that the impregnation slurry formulation without PET powder filler has a high proportion of polyurethane resin. Since polyurethane resin does not contain dyeing groups, it does not bond firmly with dye molecules after subsequent dyeing and finishing, resulting in poor color fastness and poor resin-based coloring quality.

[0134] 3. The suede microfiber synthetic leather produced in Groups 2 and 3 showed PVC color migration, perspiration fastness, and rubbing fastness grades of only 2-3, and also exhibited staining in the water fastness test. Because the 600-800 mesh PET powder particles are relatively large, they cannot be uniformly and completely mixed with polyurethane resin during impregnation preparation. Insufficient impregnation is visually apparent during impregnation, with most of the powder being carried away by the scraper. This makes it difficult to ensure uniform filling of the PET powder filler in the base fabric, compromising process stability. This further demonstrates that using impregnation slurries with high-mesh PET powder filler helps improve the dyeing performance of the base fabric, making it easier to dye after impregnation during the dyeing and finishing process.

[0135] While specific embodiments of the present invention have been described above, those skilled in the art should understand that the specific embodiments described are merely illustrative and not intended to limit the scope of the present invention. Equivalent modifications and variations made by those skilled in the art in accordance with the spirit of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for producing a high color fastness suede base cloth, characterized by: The island fiber is blended by taking PA as island phase and PE as sea phase to obtain a base cloth, PA6 powder is used as filler of impregnation slurry, the powder fineness of the PA6 powder is 1000-1500 mesh, the base cloth is impregnated by using a wet impregnation process, the impregnation slurry used for impregnation includes, by mass fraction: Polyurethane resin 100 parts, PA6 powder 30-40 parts, Cell adjusting agent 0.5-1.5 parts, DMF 160-180 parts.

2. A method for producing a high color fastness suede base cloth, characterized by: The island fiber is blended by taking PET as island phase and PE as sea phase to obtain a base cloth, PET powder is used as filler of impregnation slurry, the powder fineness of the PET powder is 1000-1500 mesh, the base cloth is impregnated by using a wet impregnation process, the impregnation slurry used for impregnation includes, by mass fraction: Polyurethane resin 100 parts, PET powder 30-40 parts, Cell adjusting agent 0.5-1.5 parts, DMF 160-180 parts.

3. The method of producing a high color fastness suede base fabric according to claim 1 or 2, characterized in that: The preparation method of the impregnation slurry is as follows: polyurethane resin 100 parts, PA6 or PET powder 30-40 parts, cell adjusting agent 0.5-1.5 parts, DMF 160-180 parts are added into a reaction kettle for stirring, the stirring speed of the stirring machine is controlled at 1300-2300 r / min, the time is 40-60 min, and the viscosity is controlled at 1000-3000 cps.

4. A method of producing a high colour fastness upper leather base fabric as claimed in claim 3, characterized in that: The preparation method of the base cloth includes: The PA or PET chip is mixed with polyethylene in weight ratio (65-70):(30-35) and then spun into island fibers; the island fibers are made into non-woven fabric through needle punching process, and the needle density is 1750-2250 C / cm 2 during the needle punching process. The needle-punched non-woven fabric is heated by a 7-stage oven with the temperature set at 80-90℃, 95-105℃, 115-125℃, 125-135℃, 125-135℃, 125-135℃ and 130-140℃ respectively, the production speed is controlled at 6.0-8.5 m / min, the non-woven fabric after heat setting is cooled by a cooling roller at 8-18℃, the thickness and gram weight of the non-woven fabric are set, and the required base cloth is obtained.

5. The method of producing a high color fastness suede base fabric as claimed in claim 3, characterized in that: The impregnated base cloth is subjected to coagulation and washing treatment to obtain an impregnated base cloth, the impregnated base cloth is subjected to fiber opening treatment to obtain an open fiber base cloth; The open fiber base cloth is dried, oiled, rubbed, skived, sanded and dyed and finished to obtain a suede base cloth.

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