CN114410851A

CN114410851A - Novel fragrant cow leather material and preparation process thereof

Info

Publication number: CN114410851A
Application number: CN202210075866.3A
Authority: CN
Inventors: 蒋伍虎; 林松; 林洁
Original assignee: Zhejiang Aokang Shoes Co Ltd
Current assignee: Zhejiang Aokang Shoes Co Ltd
Priority date: 2022-01-23
Filing date: 2022-01-23
Publication date: 2022-04-29

Abstract

The invention relates to a novel fragrant cowhide material and a preparation process thereof, wherein the preparation process comprises the following steps: first, pickling and tanning: adding perfume materials in the pickling and tanning processes of the leather materials to enable the perfume materials to permeate into leather fibers; the fragrance of the perfume material is locked in the leather material through tanning, and the fragrance is combined with the fiber tissue; second step, retanning: adding perfume material into the leather again in the retanning process to further combine perfume smell with fiber tissue of the leather, so that the perfume material can continuously release perfume smell along with the extension and stretching change of the leather; thirdly, squeezing, stretching and drying; fourthly, spraying and brushing slurry: the uneven thickness of pores among all parts of the leather is compensated by spraying and brushing the slurry, and meanwhile, the perfume material is added into the leather again in the spraying and brushing process, so that the perfume material enters the uneven pores again.

Description

Novel fragrant cow leather material and preparation process thereof

Technical Field

The invention relates to the technical field of leather manufacturing, in particular to a novel fragrant cowhide material and a manufacturing process thereof.

Background

The cowhide materials on the market at present have a plurality of classification methods, and the classification methods are based on the types of the leather materials, such as the cowhide, the buffalo hide, the yak hide and the like; there are also methods according to the place of production, such as domestic Shandong cow leather, Henan cow leather, Italy imported cow leather, etc.; the leather surface is also divided according to the style of the leather surface, such as a nappa style, an oil wax style, a frosted style and the like; it is also classified according to Zhang Fu, such as small-sized fetal calf, large-sized medium-sized calf, etc.; the above leathers are classified basically according to the place of production, style, size, etc. of the leathers, and also according to the function of the material, for example, waterproof leathers, deodorant leathers, etc.

However, no leather capable of emitting fragrance for a long time has been developed in the prior art.

Disclosure of Invention

The invention aims to provide a manufacturing process of a novel fragrant cow leather material, and solves the technical problems of how to enable leather materials to emit fragrance for a long time and enable shoes made of the novel fragrant cow leather material to emit the taste of conventional perfume in the wearing process.

The invention aims to solve the defects of the prior art and provides a manufacturing process of a novel fragrant cowhide material, which comprises the following steps:

first, pickling and tanning:

the perfume material is added in the pickling and tanning process of the leather material, the perfume material adopts a microcapsule technology, the microcapsule technology is that the microcapsule is embedded in the leather material, namely, the microcapsule embedding technology is that solid particles, liquid microdroplets or gas materials are used for generating a layer of continuous film outside the solid particles, the liquid microdroplets or the gas materials by using macromolecular compounds and the like, and then the solid particles, the liquid microdroplets or the gas materials are wrapped to form the small particles with the core-shell structure. Such spherical particles of inner coating material, which have a diameter of about only one tenth to one thousandth of the diameter of the hair strands, are called microcapsules. The perfume microcapsule material is prepared by wrapping chemical or natural perfume, essential oil and other materials in water, and can protect essence from external environment, reduce volatility, reduce fragrance escape, and control fragrance release via specific conditions (such as friction). Meanwhile, the essence material has good thermal property, can resist heating conditions of 150-. The size, thickness and other data of the microcapsule sphere can be adjusted to adapt to different leather materials. The microcapsule material has good compatibility with water, and is very suitable for processing and producing perfume leather; the perfume microcapsule material (hereinafter referred to as perfume material) is infiltrated into the leather fiber; the leather plate fiber tissue is softened and expanded by further loosening the fibers under the action of enzyme inhibition through pickling, and meanwhile, the perfume taste of the perfume material is deeply fused with the leather fiber tissue, so that the method provides for better combination of the perfume material and the leather fiber tissue in the tanning process; the shrinkage temperature of the protein of the naked leather is increased by tanning, the fiber tissue of the leather is shrunk and stabilized, the fragrance of the perfume material is locked in the leather material in the process of shrinking and stabilizing the fiber tissue of the leather, and the fragrance is combined with the fiber tissue;

second step, retanning:

the retanning is completed in the rotary drum, the perfume material is added into the leather again in the retanning process, the leather hand feeling is improved, the uniformity and consistency of the color of the blue wet leather are changed, the wear resistance of the leather surface and the shaping performance of embossing are improved, the pretreatment of water resistance or water resistance is provided, the sweat resistance, the washing fastness, the heat transfer performance and/or the inflammability are improved, the fiber density of the abdomen and the neck of the leather body is consistent with that of other parts of the leather body by using a filling mode, and the use rate of finished leather is increased; simultaneously, the perfume flavor of the perfume material is further combined with the fiber tissue of the leather material, so that the perfume material can continuously release the perfume flavor along with the extension and stretching change of the leather;

thirdly, squeezing, stretching and drying:

the water in the leather is reduced through squeezing, stretching and drying, the wrinkles of the leather are reduced, the width of the leather is increased, the combination between chemical raw materials and fibers is promoted, the dye and the fibers are further combined, and the stability is achieved;

fourthly, spraying and brushing slurry:

the uneven thickness of pores among all parts of the leather is compensated by spraying and brushing the slurry, and meanwhile, the perfume material is added into the leather again in the spraying and brushing process, so that the perfume material enters the uneven pores again.

Preferably, the perfume material is a micro-nano perfume material which is prepared by combining 5 fragrances of fresh and old delicacies of the galangal seeds in encounter, lavender, fragrant ocean and/or kapok by adopting a microcapsule technology.

Further preferably, before the pickling and tanning, fur sorting and batching, overweight and production-in drum, soaking, fleshing, liming, unloading, splitting, alkali leather entering drum, deliming and softening processes are also included; between pickling, tanning and retanning, the steps of blue leather warehousing, order sorting and batching, water squeezing and stretching, shaving, quality inspection measurement and trimming are also included; between retanning and spraying brushing, also comprises standing, neutralizing, filling and dyeing, greasing and fixing, leather unloading and setting up, vacuum drying, hanging and drying, drying and drying, dampening and standing, vibration softening, leather embryo detection and inspection, falling and softening, toggling, pressing plate, leather grinding and polishing processes; after spraying and brushing the slurry, the method also comprises the processes of rolling and polishing a pressing plate, inspecting and grading finished products, packaging and warehousing and delivering the finished products.

Preferably, before retanning, firstly, alkali and silicate on the surface of the leather are diluted and washed by rinsing, and the PH value is adjusted to prepare for retanning; after rinsing, free acid and free chromium ions in the skin are removed through neutralization, so that cationic charge is reduced, the reaction of an anionic assistant is reduced, and the anionic assistant can completely permeate and be uniformly dispersed.

Preferably, dyeing and fatliquoring are carried out after retanning, and the structure among dehydrated fibers is moistened through a fatliquoring process, so that the leather fibers are soft; strengthening and filling leather fibers to obtain plump leather; the extensibility, tensile strength, water resistance and water vapor permeability of the finished leather are maintained; the stability of the finished leather to the chemical materials is increased.

Preferably, in the wringing and stretching process, the wrinkles of the ox head, the neck, the abdomen and the part between the ribs are opened through stretching, so that the stretch width is increased; and the skin can achieve certain flatness and grain surface healing; the moisture content of the leather material containing 80% of moisture is reduced to 40-45% by squeezing water, and preparation is made for vacuum and drying.

Further preferably, in the drying process, wrinkles of the ox head, the neck, the abdomen and the part between the hips and the hips are further opened, the smoothness and the fineness of the grain surface are enhanced, the water content of the leather embryo is reduced according to the requirement of the product, the combination between the chemical material and the fiber is promoted, the leather is smooth and has no crease, and the width of the leather is increased; drying the semi-finished leather with moisture content more than or equal to 40% in an air circulation mode to enable the moisture content among the fibers of the leather to reach 16-18%; the tannin, the retanning agent, the grease, the dye and the perfume material are further combined with the leather fiber to achieve the stability.

Preferably, the drying process is completed, and then the drying process further comprises a standing process, wherein water molecules in the fiber layer and the grain surface layer are fully moved by standing, the moisture content between the fiber layer and the grain surface layer and the fragrance of the water molecules are kept uniform and consistent, and the consistency of the hardness and softness of each part of the cowhide is achieved.

Preferably, the leather is sprayed for 3-4 times, and the material spraying machine is of a glass closed type, so that dust pollution and outward flying of chemical materials are prevented.

Another aspect of the present application is to provide a novel scented cowhide material, which is produced by the above-mentioned production process.

Advantageous effects

Compared with the prior art, the invention has the beneficial effects that:

the process for preparing the novel fragrant cow leather material comprises the steps of firstly adding perfume materials in the pickling and tanning process from a fur to a blue wet leather, secondly adding perfume materials in the latter half of a water field, namely the retanning process from the blue wet leather to a leather blank, and finally adding the perfume materials in one of the final coating processes in order to enhance the concentration and the durability of the perfume, wherein the process is a spraying and brushing process. The perfume material has excellent hydrophilicity and compatibility, 100% of fragrance permeates into leather fibers, no skin irritation, no formaldehyde and other toxic components, environmental protection, good heat resistance, deodorization and antifouling, and the fragrance can be kept for more than 2 years through three processes of permeation, retanning, spraying and the like of special processes.

Drawings

The accompanying drawings are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention.

Fig. 1 is a schematic diagram of the overall structure of the manufacturing process of the novel flavored cowhide material.

Detailed Description

The present invention is described in more detail below to facilitate an understanding of the present invention.

The manufacturing process of the cowhide can be divided into two major processes on the whole: water field + post-coating. Wherein the water field is divided into two production processes from fur to wet blue and from wet blue to blank; post-finishing is the process from the skin embryo to the finished skin. The manufacturing process of the perfume leather developed by the application is mainly in the water field process, namely, the perfume material is added for the first time in the pickling and tanning process from fur to blue wet leather; the other process is the second half of the water field, namely the process of retanning the wet blue leather to the leather blank. Finally, in order to enhance the concentration and durability of the perfume, the perfume material is added in one of the processes of final coating, namely the spraying and brushing process.

As shown in fig. 1, the manufacturing process of the novel fragrant cowhide material comprises the following steps:

and (3) fur inspection and warehousing: comprises sorting and batching fur, overweight and putting into production drum, soaking, fleshing, liming and unloading fur;

and (3) alkali skin inspection and classification: comprises the steps of feeding leather sheets and alkali leather into a drum, deliming, softening, pickling and tanning;

and (3) blue skin inspection and classification: the method comprises the steps of putting blue leather into a warehouse, sorting and batching orders, squeezing and stretching, shaving evenly, measuring quality inspection, trimming, retanning, standing, neutralizing, filling and dyeing, greasing and fixing, unloading and setting up, vacuum drying, hanging and drying, drying and drying, dampening and standing, vibrating and softening, detecting and inspecting leather blanks, softening, toggling, pressing plates, buffing, polishing, spraying and brushing slurry, and tumbling and pressing plates;

and inspecting and grading finished products, packaging and warehousing and delivering the finished products.

The above is the whole leather making process, and the following details describe three key nodes and functions of the perfume leather:

the first process is as follows: pickling and tanning

In the whole production process of the leather material, a perfume material is required to be added in the pickling and tanning of the first half of a water field, the perfume material is mainly a micro-nano new material, a microcapsule technology is adopted, 5 kinds of fragrance of burning love, lavender, sea of faint scent and kapok are combined with international large brandy of fragrant, when meeting fresh/old, the international large brandy of fragrant is combined, the pure black white bull of Duffalanx, Netherlands, is carefully imported, the fragrance has excellent hydrophilicity and compatibility, 100% permeates leather material fibers, no skin irritation, no formaldehyde and other toxic components, the leather material is environment-friendly, good in heat resistance and odor-resistant and antifouling, and the fragrance can be persistently kept for more than 2 years through the permeation, retanning, spraying and other processes of the three special processes.

The microcapsule embedding technology is a method for coating solid particles, liquid microdroplets or gas with a layer of continuous film produced by a macromolecular compound and the like outside the solid particles, liquid microdroplets or gas to form small particles with a core-shell structure, and the diameter of the spherical particles internally coated with a core material is only about one tenth to one thousandth of the diameter of hair, so that the microcapsule is called as a microcapsule. Wherein the essence microcapsule is prepared by coating chemical essence or natural essential oil (perfume material) in water by coating technology. Microencapsulation of perfumes protects the perfume from the external environment, reduces volatility and contact toxicity, reduces the escape of fragrance, and controls the sustained release of fragrance through specific conditions (e.g., friction).

A. The purpose of pickling is to inhibit the action of enzyme and further loosen the fibers to soften and expand the fibrous tissue of the leather plate, and at the moment, the new nano perfume material prepared by the microcapsule technology acts with the fibrous tissue of the leather to enable the perfume taste to be deeply fused with the fibrous tissue, and then the preparation is provided for better combination of tanning procedures.

B. The tanning purpose has mainly two functions:

1. the protein of the pelts is changed into stable and non-rotten protein by increasing the shrinkage temperature, and the pelts are moisture-resistant, mildew-resistant, soft, plump, firm and durable. Through the shrinkage temperature, the characteristics of the perfume material are shrunk and stabilized along with the fibrous tissue of the leather, the fragrance characteristics are also firmly locked in the leather, and the fragrance is combined with the fibrous tissue although the relative wringing process is carried out in the later period.

2. Preparing for processing various style finished products in the next process.

The second process: retanning

The process is a process of retanning from wet blue leather to a leather blank manufacturing process (generally called a redyeing process, which comprises five processes of rinsing, retanning, neutralization, dyeing and greasing), and the process is mainly completed in a rotary drum.

Firstly, a rinsing process, namely diluting and washing alkali and silicate on the surface of the leather, and adjusting the pH value to prepare for retanning;

the subsequent neutralization is also to remove free acid and free chromium ions in the skin, reduce cationic charge, reduce the reaction of the anionic assistant and make the anionic assistant capable of penetrating and dispersing homogeneously.

The most critical process is the process of adding perfume nanometer microcapsule technical material, and the purpose of the process is as follows: a. improve the leather hand feeling, such as the plumpness, the softness and the solidity of the leather body; b. the uniformity and consistency of the color of the wet blue leather are changed; c. the wear resistance of the leather surface, the shaping performance of embossing, and the fullness, uniformity and consistency of dyeing are improved; d. providing a water-resistant or water-repellent pretreatment; improving specific properties such as perspiration resistance, washing fastness, heat transfer, flammability and other specific properties (fragrance, water resistance, etc.); e. the loose parts of the leather body, such as the abdomen, the neck and the like, can have the same fiber density with other parts by utilizing the filling mode, thereby increasing the utilization rate of finished leather.

The latter procedure is dyeing and fatliquoring. The greasing process aims to moisten the structure between fibers after dehydration and soften leather fibers; strengthening and filling leather fibers to obtain plump leather; the extensibility, tensile strength, water resistance, water vapor permeability and the like of the finished leather are maintained; the stability of the finished leather to the chemical materials is increased, and the leather can adapt to various leather products and meet the requirements of consumers.

After the retanning process, the perfume flavor in the material can be better combined with the fiber tissue of the leather, so that the stability is very strong, the perfume flavor can be continuously released along with the extension and stretching change of the leather, the perfume is lasting, and the requirements of consumers are met.

The third process: squeezing and drying

The process mainly aims to reduce the moisture in the leather, reduce the wrinkles of the leather, enlarge the width of the leather, promote the combination between chemical raw materials and fibers, further combine dyes and fibers and achieve stability.

Stretching and squeezing water: the stretching is to open the wrinkles of the ox head, neck, abdomen and the part between the ribs and the hips and to increase the width; the skin achieves certain flatness and grain surface healing; the water squeezing is to reduce the water content of the leather material containing 80 percent of water content to 40 to 45 percent of water content through water squeezing, and the preparation is made for vacuum and drying.

And (3) drying: further opening wrinkles of the ox head, the neck, the abdomen and the part between the ribs and the hips of the ox head, the neck, the abdomen and the abdomen, and enhancing the smoothness and the fineness of the grain surface; the water content of the leather embryo is reduced according to the product requirement, the combination between the chemical material and the fiber is promoted, the leather is smooth and has no crease, and the leather width is increased. Drying the semi-finished leather with moisture content more than or equal to 40% in an air circulation mode to enable the moisture content between leather fibers to reach 16-18%. Tannin (retanning agent), oil, dye, perfume capsule nano material and the like are further combined with the fiber to achieve stability.

Followed by additional procedures, including a resting procedure. The process mainly ensures that water molecules in the fiber layer and the grain surface layer move fully, and the water content and the perfume smell between the fiber layer and the grain surface layer are kept uniform and consistent, so that the hardness of each part of the cowhide is consistent.

The fourth process: spraying of paint

The process is mainly used for making up the unevenness of pore thickness among all parts, and meanwhile, the perfume nano material realized by the microcapsule technology enables the perfume material to enter some uneven pores again. The leather is usually sprayed for 3-4 times, and the spraying machine is glass closed, so that dust pollution and outward flying of chemical materials are prevented. Through the action of the perfume nano material for the last time, the perfume implementation process of the whole leather is completed, so that the perfume material can be ensured to keep the lasting fragrance for more than 2 years.

Through the four key steps of the leather manufacturing process, the nano perfume material under the microcapsule technology is successfully and stably combined with leather fibers, and the set perfume flavor is emitted in a multi-level and multi-dimensional mode for a long time, so that the requirements of the market and customers are met. The application mainly protects the process flow of the perfume leather.

The foregoing describes preferred embodiments of the present invention, but is not intended to limit the invention thereto. Modifications and variations of the embodiments disclosed herein may be made by those skilled in the art without departing from the scope and spirit of the invention.

Claims

1. A manufacturing process of a novel fragrant cowhide material is characterized by comprising the following steps:

first, pickling and tanning:

adding perfume materials in the pickling and tanning processes of the leather materials to enable the perfume materials to permeate into leather fibers; the leather plate fiber tissue is softened and expanded by further loosening the fibers under the action of enzyme inhibition through pickling, and meanwhile, the perfume taste of the perfume material is deeply fused with the leather fiber tissue, so that the method provides for better combination of the perfume material and the leather fiber tissue in the tanning process;

the shrinkage temperature of the protein of the naked leather is increased by tanning, the fiber tissue of the leather is shrunk and stabilized, the fragrance of the perfume material is locked in the leather material in the process of shrinking and stabilizing the fiber tissue of the leather, and the fragrance is combined with the fiber tissue;

second step, retanning:

thirdly, squeezing, stretching and drying:

fourthly, spraying and brushing slurry:

2. The process for preparing the novel cowhide material with fragrance according to claim 1, wherein the perfume material is a micro-nano perfume material prepared by combining 5 fragrances of fresh and old love passion of the galangal in encounter, lavender, fragrant ocean and/or kapok by adopting a microcapsule technology.

3. The process for making a novel flavored kraft material according to claim 1, further comprising, prior to said pickling and tanning, fur sorting and batching, overweight and input into drums, soaking, fleshing, liming, skin unloading, flaking, alkali leather entering drums, deliming and bating processes; between pickling, tanning and retanning, the steps of blue leather warehousing, order sorting and batching, water squeezing and stretching, shaving, quality inspection measurement and trimming are also included; between retanning and spraying brushing, also comprises standing, neutralizing, filling and dyeing, greasing and fixing, leather unloading and setting up, vacuum drying, hanging and drying, drying and drying, dampening and standing, vibration softening, leather embryo detection and inspection, falling and softening, toggling, pressing plate, leather grinding and polishing processes; after spraying and brushing the slurry, the method also comprises the processes of rolling and polishing a pressing plate, inspecting and grading finished products, packaging and warehousing and delivering the finished products.

4. The process for preparing a novel odorous cowhide material according to claim 1, wherein before retanning, alkali and silicate on the surface of the hide are first diluted and washed by rinsing, and the PH is adjusted to prepare for retanning; after rinsing, free acid and free chromium ions in the skin are removed through neutralization, so that cationic charge is reduced, the reaction of an anionic assistant is reduced, and the anionic assistant can completely permeate and be uniformly dispersed.

5. The process for preparing the novel fragrant cow leather material as claimed in claim 1, wherein dyeing and fatliquoring are carried out after retanning, and the structure between dehydrated fibers is moistened through a fatliquoring process, so that leather fibers are soft; strengthening and filling leather fibers to obtain plump leather; the extensibility, tensile strength, water resistance and water vapor permeability of the finished leather are maintained; the stability of the finished leather to the chemical materials is increased.

6. The process for preparing a novel flavored bovine hide material according to claim 1, wherein during the wringing and stretching process, the wrinkles of the head, neck, abdomen and ribs of the abdomen are opened by stretching to increase the width; and the skin can achieve certain flatness and grain surface healing; the moisture content of the leather material containing 80% of moisture is reduced to 40-45% by squeezing water, and preparation is made for vacuum and drying.

7. The process for preparing the novel savory cow leather material according to claim 1, wherein in the drying process, the wrinkles of the cow head, the neck, the abdomen and the part between the ribs and the hips are further opened, the smoothness and the fineness of the grain surface are enhanced, the moisture content of the leather embryo is reduced according to the product requirements, the combination between the chemical material and the fiber is promoted, the leather is smooth and free of creases, and the width of the leather is increased; drying the semi-finished leather with moisture content more than or equal to 40% in an air circulation mode to enable the moisture content among the fibers of the leather to reach 16-18%; the tannin, the retanning agent, the grease, the dye and the perfume material are further combined with the leather fiber to achieve the stability.

8. The manufacturing process of the novel fragrant cow leather material according to claim 1, wherein a standing process is further included after the drying process is completed, water molecules in the fiber layer and the grain surface layer are fully activated by standing, the moisture content between the mesh layers and the fragrance smell are kept uniform, and the consistency of the hardness and softness of each part of the cow leather is achieved.

9. The process for preparing the novel fragrant cowhide material according to claim 1, wherein the leather material is sprayed for 3-4 times, and the spraying machine is glass-enclosed to prevent dust pollution and chemical material from flying out.

10. A novel scented bovine hide material produced by the process of any one of claims 1-9.