Preparation method and application of oil-wax double-color effect leather

Abstract

The invention relates to the technical field of leather processing, and discloses a preparation method and application of leather with an oil-wax double-color effect, and the preparation method comprises the following steps: sequentially carrying out first spraying, first ironing, second spraying, standing, polishing, milling, dedusting, second ironing, color separation, third spraying and third ironing on the leather to obtain a finished product of the leather with the oil-wax double-color effect; coloring paste is used in the first guniting process, and oil wax layer paste is used in the second guniting process; the coloring paste and the oil wax layer paste both contain water-based wax. The method disclosed by the invention is high in efficiency and short in processing period, and the prepared oil-wax double-color-effect leather is high in rubbing color fastness and scratch-resistant; in the coloring process, water-based wax is used for replacing a penetrating agent, so that the coating is fast in coloring and more environment-friendly.

Description

Technical Field

[0001] The present invention relates to the technical field of leather processing, and particularly to a preparation method and application of oil wax two-color effect leather. Background Art

[0002] The oil wax two-color effect refers to the formation of a unique visual effect by superimposing two different colors through dyeing and waxing processes during leather processing. This effect usually manifests as a leather surface with a sense of hierarchy and rich color variations. When observed from different angles, different colors and texture levels can be seen.

[0003] However, the oil wax two-color effect leather produced by the prior art has the following defects:

[0004] 1. The oil wax two-color effect leather produced by the prior art has low rubbing color fastness and is not scratch-resistant;

[0005] 2. The oil wax two-color effect leather produced by the prior art has a strong waxing effect, and the two-color effect is not easy to control;

[0006] 3. The process of the oil wax two-color effect leather produced by the prior art uses dye water spraying for coloring. This process has a slow coloring speed, is prone to chemical material waste, and an penetrant is also used in this process. The dosage proportion of the penetrant is 20%, the penetrant dosage is large, and it is harmful to the human body;

[0007] 4. The processing cycle of the oil wax two-color effect leather produced by the prior art is long, and the delivery period is generally 7 - 9 days. The long production time is not conducive to rapid delivery;

[0008] 5. The two-color effect of the process of the oil wax two-color effect leather produced by the prior art is not easy to control, resulting in poor sensory quality of the finished product.

[0009] Therefore, there is an urgent need for a preparation method and application of oil wax two-color effect leather to solve the above technical problems. Summary of the Invention

[0010] Object of the Invention The object of the present invention is to overcome the above deficiencies and provide a preparation method and application of oil wax two-color effect leather.

[0011] To achieve the above object, the present invention is implemented according to the following technical solution:

[0012] A preparation method of oil wax two-color effect leather includes the following steps: sequentially passing the dyed embryo leather through first spraying, first ironing, second spraying, standing, polishing, tumbling, dust removal, second ironing, color separation, third spraying, and third ironing to obtain the finished product of oil wax two-color effect leather;

[0013] During the first spraying process, a coloring paste is used, and during the second spraying process, a wax-oil layer paste is used; both the coloring paste and the wax-oil layer paste contain water-based wax.

[0014] Specifically, for the dyeing process of the dyed leather in the present invention, existing technologies can be adopted. For example, the dyed leather used in the present invention includes chrome-tanned leather, chrome-free tanned leather, semi-vegetable tanned leather, full-vegetable tanned leather, etc.

[0015] Preferably, the coloring paste comprises the following components in parts by weight: 80-120 parts of water, 80-120 parts of water-based wax, and 20-40 parts of anionic dye water; during the first spraying process, a spraying machine is used for dot spraying, and the spraying times are at least once.

[0016] Preferably, the number of spraying times for the first spraying is three times.

[0017] Preferably, the water-based wax in the coloring paste is at least one of MELIO WAX 182 (Stahl), MELIO WAX 145 (Stahl), 0428-WA (Picard), and 4628-AA (Picard).

[0018] Preferably, the parameters of the first spraying process are as follows: gun grid: 15-20 grids; spraying method: dot spraying; rotational speed: 24-28 RPM; line speed: 8-12 m / min; single-foot dosage: 1.2-1.5 g / sf; oven temperature: 60-70 °C.

[0019] Preferably, the parameters of the first ironing process are as follows: pressure is 0.2-0.6 MPa; temperature is 120-140 °C.

[0020] Preferably, the wax-oil layer paste comprises the following components in parts by weight: 100-200 parts of water, 80-120 parts of water-based wax, 80-120 parts of jet black wax, 20-70 parts of polyurethane resin, 20-70 parts of water-based non-ionic oil, 30-80 parts of crystal wax, and 25-50 parts of anionic dye water; during the second spraying process, a spraying machine is used for full spraying, and the spraying times are at least once.

[0021] Preferably, the number of spraying times for the second spraying is three times.

[0022] Preferably, the water-based wax in the oil wax layer slurry is at least one of MELIO WAX 182 (Stahl) and MELIO WAX 186 (Stahl); the jet black wax in the oil wax layer slurry is at least one of 0418-FP (Picard), 0414-FP (Picard), and 4655-AA (Picard); the polyurethane resin in the oil wax layer slurry is at least one of RODA PUR WX1418 / F (TFL), 786-UR (Picard), TOP APT (Stahl), 1441-UR (Picard), and ACTYBIND PU511 (ATC); the water-based non-ionic oil in the oil wax layer slurry is at least one of 0386-AK (Picard) and FI-18-388 (Stahl); the crystal wax in the oil wax layer slurry is SEAWAX 352A (Sidun Chemical).

[0023] Preferably, the parameters of the second spraying process are as follows: gun grid: 15 - 20 grids; spraying method: full spray; rotation speed: 24 - 28 RPM; line speed: 8 - 12 m / min; single ruler dosage: 0.8 - 1.0 g / sf; oven temperature: 60 - 70 °C.

[0024] Preferably, during the standing process, the standing time is 6 - 12 h.

[0025] Preferably, during the polishing process, a pass-through polishing machine is used; the polishing method is: two-knife polishing method, the joint passes through, first the head feeds 10 - 15 cm, and then the tail feeds and the joint passes through.

[0026] Preferably, during the softening process, the softening time is 1 - 4 h; the softening process is carried out using a drum. Specifically, the model of the drum used is an octagonal stainless steel softening drum.

[0027] Preferably, an ion flow dust collector is used during the dust removal process.

[0028] Preferably, the parameters of the second ironing process are as follows: pressure is 0.2 - 0.6 MPa, and temperature is 120 - 140 °C.

[0029] Preferably, manual color separation is adopted during the color separation process.

[0030] Preferably, slurry C is used during the third spraying process; the slurry C includes the following components in parts by weight: 80 - 120 parts of water, 80 - 120 parts of water-based nitrocellulose emulsion, 5 - 10 parts of hand feel agent, and 5 - 10 parts of anionic dye water; the number of spraying times is at least once.

[0031] Preferably, the parameters of the third spraying process are as follows: gun grid: 15 - 20 grids; spraying method: full spraying; rotation speed: 24 - 28 RPM; wire speed: 8 - 12 m / min; single - ruler dosage: 0.3 - 0.5 g / sf; oven temperature: 60 - 70 °C.

[0032] Preferably, the number of spraying times for the third spraying is two.

[0033] Preferably, the parameters of the third ironing process are as follows: pressure is 0.2 - 0.6 MPa, and temperature is 120 - 140 °C.

[0034] Preferably, the aqueous nitrocellulose emulsion in the sizing agent C is at least one of TECTOP WB138 (Dexin Chemical Industry) and MELIO EW - 346 (Stahl); the feel - improver in the sizing agent C is at least one of 7612AT (Perkal) and HM - 13 - 843 (Stahl) and 7620AT (Perkal);

[0035] Specifically, the anionic dye water used in the present invention can be selected from those commonly used in the prior art; further preferably, the anionic dye water can be selected from the Stahl anionic dye water series or the Quanfeng Chemical Industry anionic dye water series. The color selection of the dye water in different steps of the present invention can be carried out according to specific requirements, which can be the same color or different colors, without specific limitation.

[0036] Specifically, the ironing process mentioned above uses a domestic Jinlin ironing machine.

[0037] The parentheses corresponding to the chemicals involved in the above steps are the manufacturers of these chemicals.

[0038] The oil - wax two - color effect leather prepared by the above preparation method is applied to leather clothing.

[0039] Preferably, the application of the oil - wax two - color effect leather includes the following steps: the oil - wax two - color effect leather is successively cut into pieces, sewn into clothes, and the finished clothes are washed with water to obtain the finished leather clothing.

[0040] Preferably, a water - washing liquid is used in the process of washing the finished clothes; the water - washing liquid includes the following components in parts by weight: 100 - 200 parts of water, 10 - 20 parts of feel - improver MA - 389 (Stahl), and 5 - 10 parts of feel - improver HM - 13 - 843 (Stahl).

[0041] Specifically, the process of cutting pieces is to cut according to the clothing pattern; the process of sewing into finished clothes is to sew according to the pattern; the equipment used for washing the finished clothes is a stainless steel softening drum; the parameters for washing the finished clothes are as follows: spraying time: 5 - 10 seconds; spraying interval: 15 - 30 seconds; spraying washing liquid time: 5 - 10 seconds; spraying washing liquid interval: 15 - 30 seconds; set frequency: 30 - 50 Hz; frequency change rate: 3 - 5 Hz; drum internal temperature correction: 20 - 30 °C; drum internal humidity correction: 10 - 14%; heating pipe temperature correction: 10 - 20 °C; amount of spraying washing liquid: 20% - 50% of the mass of the finished clothes.

[0042] The process of washing the finished clothes of the present invention can make the finished clothes feel more delicate, the touch more comfortable, and the wax feeling more plump.

[0043] The principle of action of the present invention:

[0044] The delivery time of the present invention (the preparation time of the oil - wax two - color effect leather) is 3 - 4 days. In the present invention, the two - color effect can be controlled by the main air pressure of the spraying machine, the gun pressure, the gun grid, the single - ruler consumption, and the fan shape of the spray gun.

[0045] In the prior art, the rubbing color fastness of conventional oil - wax products for finishing is low and they are not scratch - resistant. In the present invention, the hot - melt wax in the spraying formula is adjusted to water - based wax, reducing the discoloration effect of the oil - wax, improving the scratch - resistance of the finished product. The top coating (the process of the third spraying in the present invention) uses nitrocellulose varnish (the water - based nitrocellulose emulsion of the present invention), which improves the rubbing color fastness of the finished product and also makes the finished product feel more delicate, solving the short - board problems of low rubbing color fastness and not being scratch - resistant of leather clothing with vintage oil - wax products.

[0046] Compared with conventional oil - wax finishing, the two - color of the present invention is more natural in appearance. After the leather is made into finished clothes and then washed, the final finished - product style effect is obtained, which is deeply loved by customers.

[0047] The method of the present invention breaks the conventional process. Normally, for two - color, it is spray - dyeing or roll - coating with dye water plus penetrant. The idea of the prior art is to roll - coat two - color with penetrant plus a certain amount of dye water. In the prior art, no one uses water - based wax to spray color by point - spraying with a spraying machine. The present invention uses point - spraying with a spraying machine, replacing the penetrant with water - based wax. The coating is colored quickly. When spraying with penetrant and dye, the dye will be brought into the color embryo, and very little dye remains on the grain layer. In the oil - wax spraying of the present invention, 90% of the dye remains on the grain layer, accelerating the coating coloring, thus spraying a natural two - color in a cloud - like shape; the spraying machine is efficient, greatly improving the product delivery time. The roll - coating machine can roll - coat 60 - 80 pieces per hour, while the spraying machine can spray 600 - 800 pieces per hour.

[0048] Beneficial effects:

[0049] The method of the present invention is highly efficient, has a short processing cycle, and the prepared oil-wax two-color effect leather has high rubbing color fastness and scratch resistance; during the coloring process, water-based wax is used to replace the penetrant, the coating colors quickly and is more environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] Figure 1 It is a physical picture of the finished oil-wax two-color effect leather prepared in Example 1 of the present invention;

[0051] Figure 2 It is a physical picture of the finished oil-wax two-color effect leather prepared in Comparative Example 1 of the present invention;

[0052] Figure 3 It is a physical picture of the scratched finished oil-wax two-color effect leather prepared in Example 1 of the present invention;

[0053] Figure 4 It is a physical picture of the scratched finished oil-wax two-color effect leather prepared in Comparative Example 1 of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0054] The present invention will be further described below with specific examples. The illustrative embodiments and descriptions of the present invention are used to explain the present invention, but do not limit the present invention.

[0055] For all raw materials of the present invention, there is no special limitation on their sources, and they can be purchased on the market or prepared by conventional methods well-known to those skilled in the art.

[0056] For all raw materials of the present invention, there is no special limitation on their purity. The present invention preferably uses industrial purity or the conventional purity used in the field of wool leather preparation.

[0057] For all raw materials of the present invention, their trade names and abbreviations are all conventional trade names and abbreviations in the art. Each trade name and abbreviation is clear and definite in the field of its relevant uses. Those skilled in the art can purchase them from the market or prepare them by conventional methods according to the trade name, abbreviation, and corresponding uses.

[0058] For all processes of the present invention, their abbreviations are all conventional abbreviations in the art. Each abbreviation is clear and definite in the field of its relevant uses. Those skilled in the art can understand their conventional process steps according to the abbreviation.

[0059] In the present invention, those skilled in the art can prepare the required colors according to actual usage requirements, and the present invention does not limit the colors.

[0060] Example 1

[0061] Preparation Method and Application of Oil-Wax Bicolor Effect Leather: The method comprises the following steps: sequentially subjecting leather (dyed embryo leather) to first spraying, first ironing, second spraying, standing, polishing, softening by tumbling, dust removal, second ironing, color separation, third spraying, and third ironing to obtain the finished oil-wax bicolor effect leather; and sequentially subjecting the oil-wax bicolor effect leather to cutting, sewing into garments, and washing the finished garments to obtain the finished leather clothing.

[0062] During the first spraying process, a coloring paste is used; during the second spraying process, an oil-wax layer paste is used; and during the third spraying process, a paste C is used.

[0063] 1. First spraying: The number of spraying times is three.

[0064] The coloring paste comprises the following components in parts by weight: 80 parts of water, 80 parts of aqueous wax MELIO WAX 145 (Stahl), and 40 parts of Stahl anionic dye water.

[0065] The parameters of the first spraying are as follows:

[0066] Gun grid: 15; spraying method: dot spraying; rotation speed: 24 RPM; linear speed: 8 m / min; single-foot dosage: 1.2 g / sf; oven temperature: 60 °C.

[0067] 2. First ironing: Machine: domestic Jinlin ironing machine; pressure: 0.2 MPa; temperature: 120 °C.

[0068] 3. Second spraying: The number of spraying times is three.

[0069] The oil-wax layer paste comprises the following components in parts by weight: 100 parts of water, 80 parts of aqueous wax MELIO WAX 182 (Stahl), 80 parts of jet black wax 0418-FP (Picard), 20 parts of polyurethane resin RODA PUR WX 1418 / F (TFL), 20 parts of aqueous non-ionic oil 0386-AK (Picard), 30 parts of crystal wax SEAWAX 352A (Sidun Chemical Industry), and 25 parts of Stahl anionic dye water.

[0070] The parameters of the second spraying are as follows:

[0071] Gun grid: 15 grids; spraying method: full spraying; rotation speed: 24 RPM; linear speed: 8 m / min; single-foot dosage: 0.8 / sf; oven temperature: 60 °C.

[0072] 4. Standing: Standing for 6 h.

[0073] 5. Polishing: Through-type polishing machine, polishing method: two-knife polishing method, passing through the joint (first feeding the head 10 - 15 cm, and then feeding the tail to pass through the joint).

[0074] 6. Softening by tumbling: Time: 1 h, Tumbler model: Octagonal stainless steel softening tumbler;

[0075] 7. Dust removal: Ion flow dust remover;

[0076] 8. Second ironing: Machine: Domestic Jinlin ironing machine, Pressure: 0.2 MPa; Temperature: 120 °C;

[0077] 9. Color separation: Manual color separation;

[0078] 10. Third spraying: The number of spraying times is two

[0079] The sizing agent C includes the following components in parts by weight: 80 parts of water, 80 parts of aqueous nitrocellulose emulsion TECTOP WB138 (Dexin Chemical Industry), 5 parts of hand feel agent 7612AT (Pierre Cardin), 5 parts of Stahl anionic dye water;

[0080] The parameters of the third spraying are as follows:

[0081] Gun grid: 15 grids; Spraying method: Full spraying; Rotation speed: 24 RPM; Linear speed: 8 m / min; Single - foot dosage: 0.3 g / sf; Oven temperature: 60 °C;

[0082] 11. Third ironing: Machine: Domestic Jinlin ironing machine, Pressure: 0.2 MPa; Temperature 120 °C; Obtain oil - wax two - color effect leather;

[0083] 12. Cutting pieces: Cutting pieces according to the clothing pattern;

[0084] 13. Sewing into clothes: Sewing according to the pattern;

[0085] 14. Garment washing: A washing liquid is used during the garment washing process; The washing liquid includes the following components in parts by weight: 100 parts of water, 10 parts of MA - 389 (Stahl), 5 parts of HM - 13 - 843 (Stahl);

[0086] Equipment: Stainless steel softening tumbler;

[0087] Parameters: Spraying water time: 5 s; Spraying water interval: 15 s; Spraying washing liquid time: 5 s; Spraying washing liquid interval: 15 s; Set frequency: 30 Hz; Frequency change rate: 3 Hz; Drum internal temperature correction: 20 °C; Drum internal humidity correction: 10%; Heating tube temperature correction: 10 °C; Amount of spraying washing liquid: 20% of the garment mass.

[0088] Example 2

[0089] Preparation method and application of an oil-wax two-color effect leather: The method comprises the following steps: sequentially passing the leather (dyed embryo leather) through first spraying, first ironing, second spraying, standing, polishing, tumbling, dust removal, second ironing, color separation, third spraying, and third ironing to obtain the finished oil-wax two-color effect leather; sequentially passing the oil-wax two-color effect leather through cutting, sewing into clothes, and washing the finished clothes to obtain the finished leather clothing.

[0090] During the first spraying process, a coloring paste is used, and during the second spraying process, an oil-wax layer paste is used; during the third spraying process, a paste C is used.

[0091] 1. First spraying: The number of spraying times is three.

[0092] The coloring paste comprises the following components in parts by weight: 120 parts of water, 120 parts of aqueous wax MELIO WAX 145 (Stahl), and 20 parts of Stahl anionic dye water.

[0093] The parameters of the first spraying are as follows:

[0094] Gun grid: 20 grids; spraying method: dot spraying; rotation speed: 28 RPM; line speed: 12 m / min; single-foot dosage: 1.5 g / sf; oven temperature: 70 °C.

[0095] 2. First ironing: Machine: domestic Jinlin ironing machine; pressure: 0.6 MPa; temperature: 140 °C.

[0096] 3. Second spraying: The number of spraying times is three.

[0097] The oil-wax layer paste comprises the following components in parts by weight: 200 parts of water, 120 parts of aqueous wax MELIO WAX 182 (Stahl), 120 parts of jet black wax 0418-FP (Pirka), 70 parts of polyurethane resin RODA PUR WX 1418 / F (TFL), 70 parts of aqueous non-ionic oil 0386-AK (Pirka), 80 parts of crystal wax SEAWAX 352A (Weston Chemical), and 50 parts of Stahl anionic dye water.

[0098] The parameters of the second spraying are as follows:

[0099] Gun grid: 20 grids; spraying method: full spraying; rotation speed: 28 RPM; line speed: 12 m / min; single-foot dosage: 1.0 g / sf; oven temperature: 70 °C.

[0100] 4. Standing: Standing for 12 h.

[0101] 5. Polishing: Through-type polishing machine, polishing method: two-knife polishing method, passing through the joint (first feeding the head 10 - 15 cm, and then feeding the tail to pass through the joint).

[0102] 6. Softening by tumbling: Time (4h), Tumbler model: Stainless steel softening tumbler;

[0103] 7. Dust removal: Ion flow dust collector;

[0104] 8. Second ironing: Machine: Domestic Jinlin ironing machine, Pressure 0.6MPa, Temperature: 140°C;

[0105] 9. Color separation: Manual color separation;

[0106] 10. Third spraying: The number of spraying times is two

[0107] Sizing agent C includes the following components in parts by weight: 120 parts of water, 120 parts of aqueous nitrocellulose emulsion TECTOP WB138 (Dexin Chemical Industry), 10 parts of hand feel agent 7612AT (Perkal), 10 parts of Stahl anionic dye water;

[0108] The parameters of the third spraying are as follows:

[0109] Gun grid: 20 grids; Spraying method: Full spraying; Rotation speed: 28 RPM; Linear speed: 12 m / min; Single - ruler dosage: 0.5 g / sf; Oven temperature: 70°C;

[0110] 11. Third ironing: Machine: Domestic Jinlin ironing machine, Pressure 0.6MPa, Temperature 140°C; Obtain oil - wax two - color effect leather;

[0111] 12. Cutting pieces: Cutting pieces according to the clothing pattern;

[0112] 13. Sewing into clothes: Sewing according to the pattern;

[0113] 14. Garment washing:

[0114] During the process of the garment washing, a washing liquid is used; The washing liquid includes the following components in parts by weight: 200 parts of water, 15 parts of MA - 389 (Stahl), 10 parts of HM - 13 - 843 (Stahl);

[0115] Equipment: Stainless steel softening tumbler;

[0116] Parameters: Spraying water time: 10 seconds; Spraying water interval: 30 seconds; Spraying washing liquid time: 10 seconds; Spraying washing liquid interval: 30 seconds; Set frequency: 50Hz; Frequency change rate: 5Hz; Drum internal temperature correction: 30°C; Drum internal humidity correction: 14%; Heating tube temperature correction: 20°C; Amount of spraying washing liquid: 50% of the garment quality.

[0117] Example 3

[0118] Preparation method and application of oil-wax two-color effect leather: The method comprises the following steps: sequentially passing leather (dyed embryo leather) through first spraying, first ironing, second spraying, standing, polishing, softening by tumbling, dust removal, second ironing, color separation, third spraying, and third ironing to obtain finished oil-wax two-color effect leather; and sequentially passing the oil-wax two-color effect leather through cutting, sewing into clothes, and washing the clothes to obtain finished leather clothing.

[0119] During the first spraying, a coloring paste is used; during the second spraying, an oil-wax layer paste is used; and during the third spraying, a paste C is used.

[0120] 1. First spraying: The number of spraying times is three.

[0121] The coloring paste comprises the following components in parts by weight: 100 parts of water, 100 parts of aqueous wax MELIO WAX 145 (Stahl), and 30 parts of anion dye water from Quanfeng Chemical Industry.

[0122] The parameters of the first spraying are as follows:

[0123] Gun grid: 18 grids; spraying method: dot spraying; rotation speed: 26 RPM; linear speed: 10 m / min; single-foot dosage: 1.4 g / sf; oven temperature: 65 °C.

[0124] 2. First ironing: Machine: domestic Jinlin ironing machine, pressure: 0.4 MPa; temperature: 130 °C.

[0125] 3. Second spraying: The number of spraying times is three.

[0126] The oil-wax layer paste comprises the following components in parts by weight: 150 parts of water, 100 parts of aqueous wax MELIO WAX 182 (Stahl), 100 parts of jet black wax 0418-FP (Picardal), 50 parts of polyurethane resin RODA PUR WX 1418 / F (TFL), 50 parts of aqueous non-ionic oil 0386-AK (Picardal), 50 parts of crystal wax SEAWAX 352A (Sidun Chemical Industry), and 40 parts of anion dye water from Quanfeng Chemical Industry.

[0127] The parameters of the second spraying are as follows:

[0128] Gun grid: 18 grids; spraying method: full spraying; rotation speed: 26 RPM; linear speed: 10 m / min; single-foot dosage: 0.9 g / sf; oven temperature: 65 °C.

[0129] 4. Standing: Standing for 8 h.

[0130] 5. Polishing: Through-type polishing machine, polishing method: two-knife polishing method, joint passing (first, the head feeds 10 - 15 cm, and then the tail feeds and the joint passes).

[0131] 6. Softening by tumbling: Time (2h), Tumbler model: Octagonal stainless steel softening tumbler;

[0132] 7. Dust removal: Ion flow dust remover;

[0133] 8. Second ironing: Machine: Domestic Jinlin ironing machine; Pressure 0.4 MPa; Temperature: 130 °C;

[0134] 9. Color separation: Manual color separation;

[0135] 10. Third spraying: The number of spraying times is two

[0136] The sizing agent C comprises the following components in parts by weight: 100 parts of water, 100 parts of aqueous nitrocellulose emulsion TECTOP WB138 (Dexin Chemical Industry), 8 parts of hand feel agent 7612AT (Pierre Cardin), 8 parts of anion dye water from Quanfeng Chemical Industry;

[0137] The parameters of the third spraying are as follows:

[0138] Gun grid: 18 grids; Spraying method: Full spraying; Rotation speed: 26 RPM; Linear speed: 10 m / min; Single - foot dosage: 0.4 g / sf; Oven temperature: 65 °C;

[0139] 11. Third ironing: Machine: Domestic Jinlin ironing machine, Pressure 0.4 MPa; Temperature: 130 °C;

[0140] 12. Cutting pieces: Cutting pieces according to the clothing pattern;

[0141] 13. Sewing into finished clothes: Sewing according to the pattern;

[0142] 14. Washing of finished clothes: A washing liquid is used during the washing of the finished clothes; The washing liquid comprises the following components in parts by weight: 150 parts of water, 15 parts of MA - 389 (Stahl), 8 parts of HM - 13 - 843 (Stahl);

[0143] Equipment: Stainless steel softening tumbler;

[0144] Parameters: Spraying water time: 8 s; Spraying water interval: 20 s; Spraying washing liquid time: 8 s; Spraying washing liquid interval: 20 s; Set frequency: 40 Hz; Frequency change rate: 4 Hz; Drum internal temperature correction: 25 °C; Drum internal humidity correction: 12%; Heating tube temperature correction: 15 °C; Amount of spraying washing liquid: 35% of the mass of the finished clothes.

[0145] Comparative Example 1

[0146] This comparative example uses a hot - melt wax roller coating process to produce oil - wax two - color effect leather, including the following steps:

[0147] The dyed seed coats are successively subjected to roller coating - first static setting - first ironing - first spraying - second spraying - second static setting - polishing - softening by tumbling - dust removal - second ironing - color separation - third spraying - third ironing - finished products;

[0148] 1. Roller coating:

[0149] Use hot-melt wax: AS-33-250 (Stahl), and the number of roller coating times is three;

[0150] The roller coating parameters are: single-foot dosage 2 g / sf; temperature: 80 °C; plate speed: 7.6 M; material roller speed: 7.9 M; gap: 0.00 mm;

[0151] 2. First static setting: Static setting for 4 h;

[0152] 3. First ironing: Machine: domestic Jinlin ironing machine; pressure 0.4 MPa; temperature: 130 °C;

[0153] 4. First spraying: The number of spraying times is two

[0154] The slurry for spraying includes the following components in parts by weight: 100 parts of water, 20 parts of penetrant 0240-TA (Pircal), 100 parts of adhesive resin 1420-UR (Pircal);

[0155] The spraying parameters are as follows:

[0156] Gun grid: 15; spraying method: full spray; rotation speed: 24 RPM; linear speed: 8 m / min; single-foot dosage: 1.0 g / sf; oven temperature: 60 °C;

[0157] 5. Second spraying: The number of spraying times is three

[0158] The slurry for spraying includes the following components in parts by weight: 100 parts of water, 80 parts of water-based wax MELIO WAX 182 (Stahl), 80 parts of blackened wax 0418-FP (Pircal), 20 parts of polyurethane resin RODA PUR WX 1418 / F (TFL), 20 parts of water-based non-ionic oil 0386-AK (Pircal), 30 parts of crystal wax SEAWAX 352A (Weston Chemical), 25 parts of Stahl anionic dye water;

[0159] The spraying parameters are as follows:

[0160] Gun grid: 15; spraying method: full spray; rotation speed: 24 RPM; linear speed: 8 m / min; single-foot dosage: 0.8 / sf; oven temperature 60 °C;

[0161] 6. Static setting: Static setting for 6 h;

[0162] 7. Polishing: Through-type polishing machine, polishing method: Two-knife polishing method, the joint passes through (first, the head feeds 10 - 15 cm, then the tail feeds and the joint passes through);

[0163] 8. Softening: Time (1 h), drum type: Octagonal stainless steel softening drum;

[0164] 9. Dust removal: Ion flow dust removal machine;

[0165] 10. Ironing parameters: Machine: Domestic Jinlin ironing machine, pressure 0.2 MPa; Temperature: 120 °C;

[0166] 11. Color separation: Manual color separation;

[0167] 12. Third spraying: The number of spraying times is two

[0168] The slurry used for spraying includes the following components in parts by weight: 80 parts of water, 80 parts of aqueous nitrocellulose emulsion TECTOP WB138 (Dexin Chemical Industry), 5 parts of hand feel agent 7612AT (Perkalor), 5 parts of Stahl anionic dye water;

[0169] 13. Ironing parameters: Machine: Domestic Jinlin ironing machine, pressure 0.2 MPa; Temperature: 120 °C; Obtain oil-wax two-color effect leather.

[0170] The finished oil-wax two-color effect leather products prepared in Examples 1 to 3 were tested to obtain the data in Table 1:

[0171] Table 1

[0172] Softness / mm Brightness / Gu Hand feeling (oiliness) 6-7 6-10 Very good

[0173] The finished oil-wax two-color effect leather products of the three examples all meet Table 1 above, and all three examples can meet the requirements of the finished product style. The softness, brightness and hand feel of the finished products are all within the style range.

[0174] The finished oil-wax two-color effect leather products prepared in Example 1 and Comparative Example 1 were tested. The testing method was in accordance with AATCC 8 2016 / Standard Dry ≥ 3.0, Wet ≥ 2.0, and the data are shown in Table 2:

[0175] Table 2

[0176] Dry rubbing Wet rubbing Scratch resistance Comparative example 1 2.5 1.0 Not scratch resistant Example 1 of the present invention 4.0 2.0 Scratch resistant

[0177] As Figure 1 shown, it is a physical picture of the finished oil-wax two-color effect leather product prepared in Example 1 of the present invention:

[0178] As Figure 2 shown, it is a physical picture of the finished oil-wax two-color effect leather product prepared in Comparative Example 1 of the present invention;

[0179] As Figure 3 shown, it is a physical picture after scratching the finished oil-wax two-color effect leather obtained in Example 1 of the present invention. The scratched part is within the red circle in the figure;

[0180] As Figure 4 shown, it is a physical picture after scratching the finished oil-wax two-color effect leather obtained in Comparative Example 1 of the present invention. The scratched part is within the red circle in the figure.

[0181] From Figure 1 and Figure 2 , it can be seen that compared with the finished oil-wax two-color effect leather obtained in Comparative Example 1, the finished oil-wax two-color effect leather obtained in Example 1 of the present invention has a more natural two-color effect. From Figure 3 and Figure 4 and Table 2, it can be understood that the finished oil-wax two-color effect leather obtained in Example 1 of the present invention is scratch-resistant and has a small color change after scratching.

[0182] The technical solution of the present invention is not limited to the limitations of the above specific embodiments. Any technical deformation made according to the technical solution of the present invention falls within the protection scope of the present invention.

Claims

1. A method for preparing oil-wax two-color effect leather, characterized in that: The following steps are involved: The dyed embryo leather is sequentially subjected to first spraying, first ironing, second spraying, standing, polishing, softening, dust removal, second ironing, color separation, third spraying, and third ironing to obtain a finished product of oil-wax two-color effect leather; In the first spraying process, a coloring paste is used, and in the second spraying process, an oil-wax layer paste is used; both the coloring paste and the oil-wax layer paste contain water-based wax.

2. The method for preparing the oil-wax two-color effect leather according to claim 1, characterized in that: The coloring paste comprises the following components in parts by weight: 80-120 parts of water, 80-120 parts of water-based wax, and 20-40 parts of anionic dye water; the first spraying process adopts a spraying machine for spot spraying, and the spraying times are at least once.

3. The method for preparing the oil-wax two-color effect leather according to claim 2, characterized in that: The aqueous wax in the coloring paste is at least one of MELIO WAX 182, MELIO WAX 145, 0428-WA, and 4628-AA.

4. The method for preparing the oil-wax two-color effect leather according to claim 1, characterized in that: The oil-wax layer slurry comprises the following components in parts by weight: 100-200 parts of water, 80-120 parts of water-based wax, 80-120 parts of burnt black wax, 20-70 parts of polyurethane resin, 20-70 parts of water-based non-ionic oil, 30-80 parts of crystal wax, and 25-50 parts of anionic dye water; the second spraying process adopts a spraying machine for full spraying, and the spraying times are at least once.

5. The method for preparing the oil-wax two-color effect leather according to claim 4, characterized in that: The water-based wax in the oil wax layer slurry is at least one of MELIO WAX 182 and MELIO WAX 186; the charred black wax in the oil wax layer slurry is at least one of 0418-FP, 0414-FP, and 4655-AA; the polyurethane resin in the oil wax layer slurry is at least one of RODA PUR WX1418 / F, 786-UR, TOP APT, 1441-UR, and ACTYBIND PU511; the water-based non-ionic oil in the oil wax layer slurry is at least one of 0386-AK and FI-18-388; and the crystal wax in the oil wax layer slurry is SEAWAX 352A.

6. The method for preparing the oil-wax two-color effect leather according to claim 1, characterized in that: During the third spraying process, slurry C is used; the slurry C comprises the following components in parts by weight: 80-120 parts of water, 80-120 parts of aqueous nitrocellulose emulsion, 5-10 parts of hand feeling agent, and 5-10 parts of anionic dye water; The spraying frequency shall be at least once.

7. The method for preparing the oil-wax two-color effect leather according to claim 6, characterized in that: The aqueous nitrocellulose emulsion in the slurry C is at least one of TECTOP WB138 and MELIO EW-346; the hand feeling agent in the slurry C is at least one of 7612AT, HM-13-843 and 7620AT.

8. Application of the oil-wax two-color effect leather prepared by the preparation method according to any one of claims 1 to 7, characterized in that: The oil-wax two-color effect leather is applied to leather clothing.

9. The use of the oil-wax two-color effect leather according to claim 8, characterized in that: The application process comprises the following steps: cutting the oil-wax two-color effect leather into pieces, sewing it into clothes, and washing the clothes to obtain finished leather clothes.

10. The use of the oil-wax two-color effect leather according to claim 9, characterized in that: The washing liquid is used in the process of washing the garments; the washing liquid comprises the following components in parts by weight: 100-200 parts of water, 10-20 parts of hand feeling agent MA-389, and 5-10 parts of hand feeling agent HM-13-843.

Images