CN107524027B - Coating method for solving crust leather color pattern - Google Patents
Coating method for solving crust leather color pattern Download PDFInfo
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- CN107524027B CN107524027B CN201710689642.0A CN201710689642A CN107524027B CN 107524027 B CN107524027 B CN 107524027B CN 201710689642 A CN201710689642 A CN 201710689642A CN 107524027 B CN107524027 B CN 107524027B
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- crust leather
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- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
- D06P5/04—After-treatment with organic compounds
- D06P5/08—After-treatment with organic compounds macromolecular
-
- C—CHEMISTRY; METALLURGY
- C14—SKINS; HIDES; PELTS; LEATHER
- C14C—CHEMICAL TREATMENT OF HIDES, SKINS OR LEATHER, e.g. TANNING, IMPREGNATING, FINISHING; APPARATUS THEREFOR; COMPOSITIONS FOR TANNING
- C14C11/00—Surface finishing of leather
- C14C11/003—Surface finishing of leather using macromolecular compounds
- C14C11/006—Surface finishing of leather using macromolecular compounds using polymeric products of isocyanates (or isothiocyanates) with compounds having active hydrogen
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/02—After-treatment
- D06P5/04—After-treatment with organic compounds
-
- D—TEXTILES; PAPER
- D06—TREATMENT OF TEXTILES OR THE LIKE; LAUNDERING; FLEXIBLE MATERIALS NOT OTHERWISE PROVIDED FOR
- D06P—DYEING OR PRINTING TEXTILES; DYEING LEATHER, FURS OR SOLID MACROMOLECULAR SUBSTANCES IN ANY FORM
- D06P5/00—Other features in dyeing or printing textiles, or dyeing leather, furs, or solid macromolecular substances in any form
- D06P5/20—Physical treatments affecting dyeing, e.g. ultrasonic or electric
- D06P5/2066—Thermic treatments of textile materials
- D06P5/2077—Thermic treatments of textile materials after dyeing
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- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Treatment And Processing Of Natural Fur Or Leather (AREA)
Abstract
The invention relates to the technical field of leather-making chemistry and engineering, and provides a coating method for solving the problem of crust leather color, wherein oxidized polyethylene wax emulsion is introduced into a coating agent, the oxidized polyethylene wax emulsion is coated on the surface of the crust leather to present a natural fog state, the wax agent volatilizes with water during high-temperature ironing to migrate to the surface layer of a coating film to form a waxed surface layer with other components in the coating agent, so that the coating agent has a good covering effect, the crust leather with uniform and consistent surface color is obtained, and meanwhile, the oxidized polyethylene wax emulsion can increase the dispersion degree of pigment paste in the coating agent and improve the coloring strength; the coating method for solving the crust leather color pattern can obtain the crust leather product with uniform grain surface color, comfortable hand feeling, fine and smooth surface and aniline coating effect, has strong operability and high production efficiency, avoids crust leather overstock, reduces economic loss and has high practicability.
Description
Technical Field
The invention relates to the technical field of leather-making chemistry and engineering, in particular to a finishing method for solving crust leather color flower.
Background
The color pattern, also called color defect, refers to the appearance of patches with different color shades on the surface of dyed leather, and is a common defect of crust leather. The cause of the colored flower mainly comprises the following points: 1. the crust leather before dyeing has uneven state, inconsistent loose degree of collagen fibers, over-compact fiber parts, poor dye permeability, more dye combined on the crust leather surface and darker color; 2. the crust leather has position difference, after the crust leather is subjected to toggling, the area of a loose part can be stretched in a range, so that the surface color is dispersed and lightened, the area of a tight part is not expanded greatly, and the surface color is changed slightly; 3. the raw leather has neck lines and fertilizer lines, and if the previous process is not properly soaked in water and liming, zebra stripe patterns with alternate light and shade can be caused after dyeing; 4. in the process of storage and transportation of the dyed crust leather, colored patterns caused by grease, salt, dye and mould are formed on the grain surface due to the influence of the external environment.
If the color pattern of the crust leather can not be completely solved, the quality and the grade of the finished leather can be greatly reduced. At present, the traditional coating method adopts a coating method combining brush coating and spray coating to solve the problem of crust leather color, and the formula of the traditional coating agent adopted by the brush coating and the spray coating is water, composite resin, aliphatic polyurethane resin, polyacrylate resin, protein adhesive, pigment paste and penetrating agent. Although the conventional coating method can solve the problem of crust leather color, the conventional coating method adopts a mode of repeatedly coating a coating agent containing a large amount of resin and pigment paste to perform concealer treatment, but the coating agent has large proportion of the resin and the pigment paste in the formula and more coating times, so that the coating layer is thick, natural grains of crust leather are covered, the hand feeling and the grade of the crust leather are reduced, the operation is complicated, the additional cost is increased, the defects of complicated coating process formula and operation flow and the like exist, the conventional coating method is not suitable for mass production and use, and the practicability is low.
Disclosure of Invention
Therefore, aiming at the problems, the invention provides a coating method for solving the crust leather color flower, which can not only effectively solve the crust leather color flower problem and obtain crust leather with uniform surface color, but also ensure that the grain surface of the crust leather treated by the coating method for solving the crust leather color flower has comfortable hand feeling, fine surface and aniline coating effect; the coating method for solving the crust leather color pattern is strong in operability, high in production efficiency, capable of avoiding crust leather overstock, capable of reducing economic loss and high in practicability.
In order to realize the technical problem, the solution scheme adopted by the invention is as follows: a coating method for solving the problem of color patterning of crust leather is characterized by sequentially comprising the following steps:
step (1), taking colored flower crust leather, and preparing a finishing agent according to the color card color of the colored flower crust leather;
preparing a coating agent in the step (2): the coating agent comprises the following components: water, oxidized polyethylene wax emulsion, glycerol, aromatic polyurethane resin and pigment paste; when in preparation, the oxidized polyethylene wax emulsion and the pigment paste are dissolved in water, mixed uniformly, then the rest components are added, and the coating agent is obtained after uniform mixing;
step (3), spraying: spraying the coating agent prepared in the step (2) on the surface of the colored crust leather for 2-4 times by using a spraying machine;
ironing: carrying out ironing treatment on the colored fancy crust leather treated in the step (3) by using a through type ironing machine, wherein the ironing temperature is 130-;
and (5) spraying again: spraying the coating agent prepared in the step (2) on the surface of the colored crust leather for 2-4 times by using a spraying machine;
and (6) ironing again: and (4) ironing the colored fancy crust leather treated in the step (5) by using a through type ironing machine, wherein the ironing temperature is 130-.
And (7) repeatedly spraying and ironing: repeating the step (5) and the step (6) for 0-3 times according to the improvement condition of the colored flower crust leather.
Further, the coating agent in the step (2) comprises the following components in parts by weight: 350 parts of water, 80-100 parts of oxidized polyethylene wax emulsion, 30-40 parts of glycerol, 30-40 parts of aromatic polyurethane resin and 25-30 parts of pigment paste.
Furthermore, the oxidized polyethylene wax emulsion used in the step (2) is obtained by oxidizing polyethylene wax with the number average molecular weight of 3000-4000 and then emulsifying the oxidized polyethylene wax emulsion by an emulsifier, and contains-OH and-COOH active groups.
Further, the glycerol used in the step (2) is water-soluble synthetic glycerol with 65-70% of effective components.
Further, the aromatic polyurethane used in the step (2) is at least one of aromatic polyurethane emulsion, aromatic polyurethane dispersion liquid and aromatic polyurethane aqueous solution, and the solid content is 15-20%.
By adopting the technical scheme, the invention has the beneficial effects that: the coating agent adopted by the coating method for solving the problem of the coloring of the crust leather contains oxidized polyethylene wax emulsion, and the oxidized polyethylene wax emulsion is used as a carrier of the pigment paste by virtue of excellent leveling property of the oxidized polyethylene wax emulsion so as to enhance the dispersion degree of the pigment paste, avoid the agglomeration and precipitation of the pigment paste, realize uniform coating and realize good covering effect; however, the introduction of the oxidized polyethylene wax emulsion can cause the coating to be stiff and brittle and easy to crack, so that the addition of glycerol as a plasticizer can keep the coating soft and not easy to crack, and the glycerol can be mixed and dissolved with water in any proportion; meanwhile, in order to enhance the bonding fastness of the coating layer and the crust leather, aromatic polyurethane resin is added into the coating agent, and the aromatic polyurethane resin is prepared by reacting aromatic polyisocyanate and polyhydroxy compound, has high reaction activity, good adhesion, low solid content and thin film, and does not influence the natural hand feeling of the crust leather; meanwhile, after the finishing agent is coated on the surface of the crust leather, high temperature of 130-135 ℃ ironing is adopted in the ironing process, so that oxidized polyethylene wax is effectively and completely melted, part of the oxidized polyethylene wax permeates into the deep layer of the crust leather, and part of the oxidized polyethylene wax is volatilized along with water to migrate to the surface layer of the coating film to form a waxed surface layer, thereby endowing the crust leather with good gloss and comfortable hand feeling; if the ironing temperature is lower than 130 ℃, the oxidized polyethylene wax is not completely melted, and part of the oxidized polyethylene wax remains on the surface of the crust leather, so that the crust leather is in a foggy state, and the glossiness and the hand feeling of the crust leather do not meet the requirements; if the ironing temperature is higher than 135 ℃, the leather body becomes stiff, and the fullness and softness are greatly reduced; therefore, in summary, the components of the coating agent used in the coating method for solving the crust leather color flower are all water-soluble, so that the use of organic solvent is avoided, the coating agent has the advantages of environmental protection, cost saving and the like, and has a good prospect, and moreover, by the coating method for solving the crust leather color flower, a crust leather product with uniform grain color, comfortable hand feeling, fine and smooth surface and aniline coating effect can be obtained, and the coating method has the advantages of strong operability, high production efficiency, avoidance of crust leather overstock, reduction of economic loss and high practicability.
Drawings
Figure 1 is a schematic representation of light brown colored fancy hides to be treated.
Figure 2 is a schematic representation of light brown colored crust leather treated with an embodiment of the present invention.
Detailed Description
The following detailed description will be provided for the embodiments of the present invention with reference to specific embodiments, so that how to apply the technical means to solve the technical problems and achieve the technical effects can be fully understood and implemented. Unless otherwise indicated, the techniques employed in the examples are conventional and well known to those skilled in the art, and the reagents and products employed are also commercially available. Various procedures and methods not described in detail are conventional methods well known in the art, and the source, trade name, and if necessary, the constituents of the reagents used are indicated at the first appearance.
TABLE 1 names, types and manufacturers of the chemical reagents used in the examples
| Name (R) | Model number | Manufacturer of the product |
| Oxidized polyethylene wax emulsion | SFT BFG | ALPA |
| Plasticizer | SFT HG | ALPA |
| Aromatic polyurethane resin | 1360 | LAMBERTI |
| Coffee pigment paste | DOWESION COFFEE H62652 | DOWELL |
| Orange pigmentOintment | DOWESION ORANGE H62553 | DOWELL |
| Camel yellow pigment paste | DOWESION CAMEL N62232 | DOWELL |
A coating method for solving the problem of color patterning of crust leather sequentially comprises the following steps:
taking light brown colored crust leather, wherein the colored area accounts for 65 percent (shown in figure 1), and preparing the finishing agent according to the color of a color card of the crust leather to be treated;
preparing a coating agent in the step (2): firstly, accurately weighing 90 parts of water and 100 parts of oxidized polyethylene wax emulsion, and uniformly mixing; secondly, 18 parts of coffee pigment paste, 7 parts of camel yellow pigment paste and 5 parts of orange pigment paste are added and mixed uniformly, and the residual 210 parts of water is added; adding 40 parts of aromatic polyurethane resin again, and uniformly mixing; finally, 40 parts of glycerol are added and mixed evenly;
step (3), spraying: spraying the colored crust leather for 2 times by using the prepared coating agent through a spraying machine, wherein the number of spray guns of the spraying machine is regulated to 6, the pressure of a spraying pump is regulated to 1.4bar, the drying temperature of an oven is 85 ℃, and the coating amount is 8.0 g/sf;
ironing: ironing the sprayed crust leather by a through ironing machine at the ironing temperature of 130 ℃/30 kg;
and (5) spraying again: spraying the colored crust leather for 2 times by using the prepared coating agent through a spraying machine, wherein the number of spray guns of the spraying machine is regulated to 6, the pressure of a spraying pump is regulated to 1.2bar, the drying temperature of an oven is 85 ℃, and the coating amount is 6.0 g/sf;
and (6) ironing again: re-ironing the re-sprayed crust leather by using a pass ironing machine, wherein the ironing temperature is 130 ℃/30 kg; resulting in a treated crust leather (as shown in figure 2).
The crust leather treated by the method for solving the problem of crust leather color patterning is simple in process formula and short in operation flow, and can be seen from the comparison of the attached drawings, namely figure 1 (the initial state of the colored crust leather) and figure 2 (the state of the colored crust leather treated by the method disclosed by the invention), the crust leather treated by the method for solving the crust leather color patterning is uniform in color, fine and smooth in grain surface, comfortable in hand feeling, clear and natural in pores and strong in leather feeling.
The above description is only an embodiment utilizing the technical content of the present disclosure, and any modification and variation made by those skilled in the art can be covered by the claims of the present disclosure, and not limited to the embodiments disclosed.
Claims (4)
1. A coating method for solving the problem of color patterning of crust leather is characterized by sequentially comprising the following steps:
step (1), taking colored flower crust leather, and preparing a finishing agent according to the color card color of the colored flower crust leather;
preparing a coating agent in the step (2): the coating agent comprises the following components: water, oxidized polyethylene wax emulsion, glycerol, aromatic polyurethane resin and pigment paste; when in preparation, the oxidized polyethylene wax emulsion and the pigment paste are dissolved in water, mixed uniformly, then the rest components are added, and the coating agent is obtained after uniform mixing;
step (3), spraying: spraying the coating agent prepared in the step (2) on the surface of the colored crust leather for 2-4 times by using a spraying machine;
ironing: carrying out ironing treatment on the colored fancy crust leather treated in the step (3) by using a through type ironing machine, wherein the ironing temperature is 130-;
and (5) spraying again: spraying the coating agent prepared in the step (2) on the surface of the colored crust leather for 2-4 times by using a spraying machine;
and (6) ironing again: and (4) ironing the colored fancy crust leather treated in the step (5) by using a through type ironing machine, wherein the ironing temperature is 130-.
And (7) repeatedly spraying and ironing: repeating the step (5) and the step (6) for 0-3 times according to the improvement condition of the colored flower crust leather.
The coating agent in the step (2) comprises the following components in parts by weight: 350 parts of water, 80-100 parts of oxidized polyethylene wax emulsion, 30-40 parts of glycerol, 30-40 parts of aromatic polyurethane resin and 25-30 parts of pigment paste.
2. The finishing method for solving the problem of the colored pattern of the crust leather according to claim 1, wherein: the oxidized polyethylene wax emulsion used in the step (2) is obtained by oxidizing polyethylene wax with the number average molecular weight of 3000-4000 and then emulsifying the oxidized polyethylene wax emulsion by an emulsifier, and contains-OH and-COOH active groups.
3. The finishing method for solving the problem of the colored pattern of the crust leather according to claim 1, wherein: the glycerol used in the step (2) is water-soluble synthetic glycerol, and the effective component is 65-70%.
4. The finishing method for solving the problem of the colored pattern of the crust leather according to claim 1, wherein: the aromatic polyurethane used in the step (2) is at least one of aromatic polyurethane emulsion, aromatic polyurethane dispersion liquid and aromatic polyurethane aqueous solution, and the solid content is 15-20%.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710689642.0A CN107524027B (en) | 2017-08-14 | 2017-08-14 | Coating method for solving crust leather color pattern |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710689642.0A CN107524027B (en) | 2017-08-14 | 2017-08-14 | Coating method for solving crust leather color pattern |
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| CN107524027A CN107524027A (en) | 2017-12-29 |
| CN107524027B true CN107524027B (en) | 2020-01-10 |
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| CN114214469B (en) * | 2021-12-13 | 2023-04-18 | 焦作隆丰皮草企业有限公司 | Natural grain-throwing coating process for high-grade Napa elastic leather |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1611560A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Wax-containing composition for leather and its product surface coating |
| CN101503517A (en) * | 2009-03-09 | 2009-08-12 | 陕西科技大学 | Preparation of cationic-nonionic modified oxidated polyethylene wax emulsion |
| CN104530365A (en) * | 2014-12-03 | 2015-04-22 | 武汉鑫睿福科技有限公司 | Waterborne polyurethane used for leather surface treatment and preparation method thereof |
| CN105779670A (en) * | 2016-04-29 | 2016-07-20 | 四川力久知识产权服务有限公司 | Wax emulsion for leather finishing and preparing method of wax emulsion |
| CN106398361A (en) * | 2016-09-05 | 2017-02-15 | 四川力久云智知识产权运营有限公司 | Cation wax emulsion for leather finishing and preparation method of cation wax emulsion |
-
2017
- 2017-08-14 CN CN201710689642.0A patent/CN107524027B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1611560A (en) * | 2003-10-31 | 2005-05-04 | 中国石油化工股份有限公司 | Wax-containing composition for leather and its product surface coating |
| CN101503517A (en) * | 2009-03-09 | 2009-08-12 | 陕西科技大学 | Preparation of cationic-nonionic modified oxidated polyethylene wax emulsion |
| CN104530365A (en) * | 2014-12-03 | 2015-04-22 | 武汉鑫睿福科技有限公司 | Waterborne polyurethane used for leather surface treatment and preparation method thereof |
| CN105779670A (en) * | 2016-04-29 | 2016-07-20 | 四川力久知识产权服务有限公司 | Wax emulsion for leather finishing and preparing method of wax emulsion |
| CN106398361A (en) * | 2016-09-05 | 2017-02-15 | 四川力久云智知识产权运营有限公司 | Cation wax emulsion for leather finishing and preparation method of cation wax emulsion |
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