KR100834276B1 - Manufacturing method of the wet type flocking - Google Patents

Abstract

A method for producing napping type artificial leather is provided to improve soft touch feeling, writing effect, and physical properties of the artificial leather, through complementary supplementation of naps, opening cells, resin flock, and hairiness. A water-hardenable resin solution is coated on a base. The water-hardenable resin solution contains a water-hardenable polyurethane resin solution, surfactant, dye, and DMF(dimethylformamide) dilution solvent. Flock materials are flocked on the coated base. The flocked matter is immersed in water containing DMF of 8-35 %, thereby extracting the solvent from the water-hardenable resin solution and solidifying the water-hardenable resin solution simultaneously. The solidified resin layer is refined to form resin flock. Further, a washing step and a drying step additionally are comprised after the solvent-extracting and solidifying step in the method for producing napping type artificial leather.

Description

Manufacturing method of brushed artificial leather {Manufacturing method of the wet type flocking}

Figure 1: Schematic diagram of conventional dry planting method

Figure 2: Schematic diagram of the method of manufacturing wet nubuck synthetic leather

3 is a schematic diagram of a wet hair method according to the present invention

4: Cross section of conventional dry flocking product

5 is a cross-sectional view of the product produced by the present invention

6: Surface drawing of conventional dry flocking product

Figure 7: Surface Diagram of Products Prepared by the Present Invention

`` Explanation of reference symbols ''

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a method for producing brushed artificial leather by using a flocking method for producing brushed artificial leather having wool on the surface thereof.

The present invention relates to a method of manufacturing a brushed artificial leather, which is a hydrocurable resin solution containing a hydrocurable polyurethane resin solution, a surfactant, a pigment, and a DMF diluent on a substrate (hereinafter referred to as a "curable resin solution"). Primary coating step of coating with; A seedling step of planting seedlings in a primary coated hydrocurable resin solution; Solvent extraction and coagulation step of immersing the planted in water diluted with DMF (dimethylformamide) to extract the solvent of the water-curable resin solution and to solidify the water-curable resin solution; And a polishing step.

The first dry hair method (see FIG. 1) of the prior art is a product in which microfiber powder fibers are planted.

That is, dry acrylic or urethane adhesive (B) is applied to the substrate (A), and the finely divided fiber powder (C) such as nylon and polyester having an appropriate fineness is electrostatically piled, and the solvent is indirect hot air by heat oil or steam. Drying and direct aging (f) by direct direct hot air to have a fibrill effect.

At this time, the fineness of the fibrous hair is 0.2 denier, and short fibers of around 0.2mm are generally used for the island length. The dry model artificial nubuck, described in the prior art, is a fiber powder, which is only distributed on the surface (see Fig. 6), and has excellent fibril effect, but it is pointed out that the natural green leaf leather lacks the rust and feel and is artificial. It has been disadvantageously limited to use in some shoes or furniture due to the low friction fastness. In addition, there is a disadvantage in that the substrate A must first be prepared and then subjected to a difficult hair removal process.

The dry hair method has the disadvantage that there is no effect of the resin hair of the following wet type nubuck product to form a brush by the hair.

Secondly, there are wet nubuck products (see Figure 2).

This is applied to the wet type polyurethane resin coating liquid (B ') to the substrate (A) and then put in water (D) to coagulate the resin (d) at the same time as the solvent extraction.

DMF (di-methyl formamide), the main solvent included in the coating solution, has a strong hydrophilic property and is diffused and extracted into a low concentration of water, and countless micropores (K) are formed in the resin layer. Water washing (e), drying (f ') to remove the water to remove the solvent, and the surface is polished (h) to open the pores and the resin of the pores and pores to form a resin hair (B). This product has surface touch similar to natural leather depending on the characteristics of resin, but the length of resin hair is very short because it is smaller than the diameter of micropores, so it is less effective than fibril or fiber hair of natural leather.

This shows only the effect of resin hair, there is no hair-drying process of the dry hair method, there is a disadvantage that there is no brushing effect by the hair

Prior Art Thirdly, the present invention discloses a fiber powder mixed wet nursing product in 10-2006-64303 (2006.7.10 application), which is developed and applied by the present inventors.

This is a method designed to simplify the process while improving the short resin wool effect of wet Noodle products. When blending the resin, the microfiber powder (C) is mixed with the resin (B ') and applied to the substrate. -In the process of washing with water-drying-polishing, microfiber powder protrudes during polishing to get an improved effect.

This has the advantage that only the advantages of the first and second prior art can be obtained, but it has a limitation that the length, content, etc. of the fiber hair can not be freely selected because the process of mixing the planting material with the resin is adopted. In other words, if the length of the hair is longer than 0.3mm in order to produce the effect of raising, fiber hair is not evenly mixed or entangled when mixed with the resin, and this causes a restriction on the filtering network during filtration and a certain amount to increase the hair effect. If there is a problem, such as peeling strength is falling, there are some limitations despite the new improved good method.

The present invention has been researched and developed for the purpose of stimulating consumer's desire and inducing consumption with other forms of improved quality, which saves the advantages of the conventional methods and improves the disadvantages.

The present invention relates to a method of producing brushed artificial leather (see FIG. 3), and the first invention of the present application includes a hydrocurable polyurethane resin solution, a surfactant, a pigment, and a DMF diluent in a substrate. A first coating step of coating with a hydrocurable resin solution; A seedling step of planting seedlings in a primary coated hydrocurable resin solution; Solvent extraction and coagulation step of immersing the planted in water containing 8 to 35% or less of DMF (dimethylformamide) to extract the solvent of the water-curable resin solution and to solidify the water-curable resin solution; And a resin hair formation step of forming a resin hair by polishing the solidified resin layer.

The second invention of the present application is to add the second coating step of coating the second step of the first layer of the first invention with a water-curable resin solution after the planting step, the second coating is immersed in water to extract the solvent And a method of planting characterized in that it leads to a solidification step. The second invention is a method of obtaining a good result by selectively applying a curable resin solution having a lower viscosity than the curable resin solution on the seedling layer when the grain size of the seedlings is large or the settlement is slow.

As a result of the present invention, the surface is not only planted brushed, but in the extraction and solidification step of the hydrocurable resin solution, numerous micro pores are formed in the resin layer, and air escapes from the surface. Openings are formed. When the surface is polished, the pores become pores, and when the pores are polished, fine resin hair is formed.

That is, the seeded wool and resin wool and openings are formed at the same time to produce a new type of product having physical properties such as soft touch, writing effect, improved abrasion, and dyeing property with their proper complementary relationship.

In the present invention, the "brushed form" is used to mean that it includes all of the brushed hair by the hair, the resin hair by the surface polishing, the pores.

In the present invention, "brushed artificial leather" means not only the brushed artificial leather and film as the finished product manufactured by the present invention, but also the intermediate material (meaning the intermediate material before the product according to the present invention is manufactured into a specific final product). It is used as a meaning including brushed artificial leather and film as.

The objective of this invention is demonstrated concretely.

A first object of the present invention having such a feature is to provide a new manufacturing method for producing a nubuck artificial leather.

The substrate is coated with a hydrocurable resin and sieved, and then immersed in a water containing DMF (dimethylformamide) to extract a solvent and at the same time, solidifying and bonding the resin and polishing the resin.

The present invention is applied to a hydraulic resin solution, and to the resin layer, the hair to be fed such as short fibers (pile), leather powder, etc. by electro-static flocking or spread flocking (spread flocking) method After lamination, it is allowed to settle down (in the case of a large or slow settling of the workpiece, a process of applying a low-viscosity hydrocurable resin solution can be added). It forms and immerses it in water to solidify the hydrocurable resin while extracting the solvent. Solvent Extraction As the solvent is extracted during the coagulation step, numerous micropores and openings are formed in the water-curable resin, and the surface thereof is polished to form resin hair.

That is, the present invention simultaneously has the brushed hair by the conventional dry hair-growth method and the resin hair according to the conventional wet-nubuck leather manufacturing method, and adopts all of these advantages, thereby providing a superior product in a new form.

In the conventional dry hair method, in the process of manufacturing fiber products, artificial leather, etc., in which wool exists on the surface, solidifying and aging an adhesive for adhering the target material (fiber pile, leather powder) to the substrate In the present invention, a drying method using a dry heat source such as fruit oil, steam, or direct fire is used. However, in the present invention, the solvent is extracted by immersing in DMF-containing water after planting in a hydraulic resin solution. At the same time, the resin solidifies and solidifies the micropores and pores formed in the water-curable resin to form a resin hair, and thus there is a big difference in the process, and at the same time, it has the brushing effect by the bristles and the resin hair effect by the hydraulic resin. There is a big difference in that it can.

In addition, in the conventional wet hair removal method, there is no hair removal process, and thus, the effect of raising is not obtained, and only the effect of resin hair can be obtained. However, in the present invention, there is a difference in configuration in that the brushing step is included. There is a big difference in that it can have the resin hair effect by the hydraulic resin at the same time.

The second object of the present invention is to provide a new type of nubuck artificial leather product which improves the disadvantages of the conventional formula-type artificial leather and wet artificial leather and supplements the advantages thereof.

The present invention improves both the dry touch feeling and artificial appearance, which is a disadvantage of the conventional food-type artificial nubuck products, and the almost no numbness (fibril) effect, as there is almost no length of resin hair which is a disadvantage of the nubuck wet artificial leather. By having both of these advantages, the brushing effect and the resin hair effect, they have a texture and appearance similar to that of natural nubuck leather.

It is a third object of the present invention to provide a new type of nubuck artificial leather with the addition of a relatively simple manufacturing process.

Following the manufacturing process of the wet synthetic leather, the coating process of the primary hydrocurable resin solution and the inline of the bristles and the secondary hydrocurable resin solution coating process are performed. To get.

The fourth object of the present invention is to generalize the manufacturing process.

The prior application (10-2006-64303) of the present inventors has a limitation that the length, content, etc. of the fiber hair cannot be freely selected by adopting the process of mixing the seedlings with the resin. In other words, if the length of the hair is longer than 0.3mm in order to produce the effect of the hair, the hair is not evenly mixed or entangled when the fiber hair is mixed. There is a problem that the peeling strength is lowered, and even though it is a good method that greatly improves the disadvantages compared to the conventional method, there are some limitations.

The present invention improves the disadvantages of the present application of the present inventors, and the stacked seedlings, ie, short fibers or leather powders, can be widely applied in kinds, fineness, and islands, without being mixed or filtered. The base can be easily laminated. As a result, the surface effect can be produced in various ways, and the range of artificial leather parts can be greatly expanded by the diversification of materials.

The fifth object of the present invention is to evolve into a variety of new technologies in the construction method of the present invention.

The wide selection of base materials and seedlings can be used to broaden its scope of application, which is a catalyst for new technologies, which is a great boost for the development of related industries.

The present invention relates to a method of manufacturing brushed artificial leather (see FIG. 3), and the first invention of the present application includes a hydrocurable polyurethane resin solution, a surfactant, a pigment, and a DMF diluent in a substrate. A first coating step of coating with a hydrocurable resin solution; A hair transplanting step of planting the planting material in the primary coated resin solution; Solvent extraction and coagulation step of immersing the planted in water containing 8 to 35% or less of DMF (dimethylformamide) to extract the solvent of the water-curable resin solution and to solidify the water-curable resin solution; It characterized in that it comprises a resin hair forming step of forming a resin hair by polishing the surface of the numerous fine pores and pores formed in the solvent extraction and solidification step.

The second invention of this application is to add a secondary coating step of the second coating step with a hydrocurable resin solution on the seedling layer subsequent to the planting step of the first invention, and then immersed in the water to the secondary coating Characterized in the planting method characterized by the solvent extraction and solidification step.

In the second invention, when the particle size of the seedlings is large or the settling time is slow, the process is not carried out until the natural invasion, and the process is carried out quickly. It is a method of apply | coating the water-curable resin solution whose viscosity is lower than a resin solution on a to-be-planted object.

As a result, the surface is not only planted wool, but numerous micropores and open cells are formed in the extraction and solidification step of the hydrocurable resin solution. With their proper complementation, new products are produced with significantly improved soft touch, writing effect, improved wear and dye transfer.

The constitution of the present invention is a method of artificial leather artificial wool, as shown in Figure 3, take-off-hydrocurable resin solution coating-seedlings-(hydrocurable resin solution secondary coating)-solvent extraction and coagulation by submerged water- It can generally be constructed in the order of washing, drying, polishing, hair forming, and winding.

The biggest technical feature of the present invention is the above-mentioned liquid-curable resin coating-seedling-(hydrocurable resin solution coating)-submerged solidification-polishing.

This is equivalent to the efficient selection and placement of the components of the existing dry wool process (FIG. 1) and the wet-type nubuck product manufacturing process (FIG. 2). As a result, synergistic effects are obtained by combining heterogeneous manufacturing techniques.

Technical features of the method for manufacturing brushed artificial leather of the present invention will be described in detail in the order of process.

1. Equipment takeover

The substrate is usually in the form of a roll, and the take-out process is performed to introduce it into the production line.

It is usually performed in the normal hair-flation work, the manufacturing process of synthetic leather, and the like.

2. Primary coating water-curable resin solution coating

Water-curable resin solution is the main component of the resin hair. At the same time, it acts as an adhesive agent to keep the hair to be fed such as fibrous hair.

The composition of the water-curable resin solution is preferably the following composition.

100 parts by weight of a wet polyurethane solution stock solution (solid content 30%)

0.5 to 5 parts by weight of anion surfactant

1 to 5 parts by weight of nonion surfactant

1-20 parts by weight of pigment

DMF dilution solvent (dimethylformamide) is made based on 5 to 25 parts by weight, the solid content or the content of the dilution solvent can be appropriately adjusted in the present invention as needed.

The viscosity of the water-curable solution of the present invention is advantageously higher than the usual viscosity. This prevents the seedlings from subsidence into the liquid curable resin.

3. Planting process

The bristles of the present invention employ a 'static hair' or 'dispersed hair' method. These electrostatic capping methods and distributed capping methods are widely used in the art, and are described in the applicant's prior application.

Planted seedlings are submerged into the hydrocurable resin solution over time due to their own weight. After a certain time, most of the plants are submerged in the hydrocurable resin layer. In the hair-planting process, the seedlings adhered uniformly to the entire surface are settled and have a natural coexistence with the resin.

This allows the brushed and resinous hair to coexist on the surface at the same time. To this end, the seedlings are embedded in the resin layer, and then brushed, resin hairs, and openings are simultaneously exposed in the subsequent post-processing process.

4. Second coating Water-curable resin solution coating

This process can optionally be applied if necessary.

Planted plants should be submerged and embedded for a given purpose before being immersed in water. If the size of the seedlings is small, it takes a short time to settle and dwell into the primary coated hydraulic resin. However, when the size of the seedlings is large or the settlement is slow, it takes a long time to settle and invade. If the seedlings are concentrated on the surface due to the slow settling into the resin layer, the seedlings are largely separated during the polishing process, and the resin wool is hardly formed, and thus it is difficult to achieve a predetermined purpose. Secondary coating allows free selection of the workpiece.

In addition, the secondary coating of the water-curable resin solution can improve the desired production speed by forcibly embedding the target tree without waiting for the seedling to settle down properly.

On the other hand, it is possible to manufacture a product having a higher friction fastness of the seedlings due to the secondary coating, or a product with a sense of volume.

As a result, the seedlings to be planted increase the adhesive strength of the primary coated hydraulic resin solution, and serves to maintain the surface of the resin hair, opening, and fiber hair.

Second coating water-curable resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

0.5 to 5 parts by weight of anion surfactant

1 to 5 parts by weight of nonion surfactant

5-25 parts by weight pigment

DMF diluent (dimethylformamide) 100 to 250 parts by weight based on the solid content of the wet polyurethane in the present invention, the content of the dilution solvent can be appropriately adjusted as necessary.

The hydraulic resin solution to ideally embed the seedlings should have good flowability. The seedlings laminated on the primary coated hydraulic resin solution are distributed at high density and have a lot of air between the particles. The secondary coated hydraulic resin solution to be applied thereon should be naturally infiltrated and uniformly filled between the seedlings. In order to facilitate this goal, it is necessary to select a flowable hydraulic resin. When the second solution is high in viscosity or poor in flowability, the voids may not be evenly filled and may cause surface defects such as air holes in subsequent processes. In general, an easy method for improving the flowability of the hydrocurable resin having physical properties is to lower the concentration to lower the viscosity. In the test of the present invention, 250-5000cps or less is universal according to the kind of seedlings, and can be appropriately adjusted according to the type of work.

In the present invention, the method of applying the second coating water-curable resin solution to ideally embed the seedlings can be applied to the knife coating and the spray coating method on the back-up roll, but the spray coating method showed more effective results. The state in which the seedlings are planted on the water-curable resin solution is before the first coating water-curable resin solution is solidified and the fluidity is high. It is very sensitive to external force because it needs to coat the secondary coating hydraulic resin solution on it.

Water-curable resin particles by spray coating evenly penetrate the inside evenly to minimize the occurrence of voids by facilitating defoaming.

5.Immersion in water (solvent extraction and coagulation)

After embedding the seedlings in the hydrocurable resin layer, it is immersed in water (coagulated water) in which the DMF is maintained at a concentration of 8 to 35%. Here, the solvent contained in the hydrocurable resin layer is extracted, the resin is solidified, and the seedlings are fixed. It is a very innovative solution to apply the submerged method, not dry, as a method of sticking and sticking the composition of the present invention.

In the conventional general woolen yarn, the resin layer and the woolen layer have a clear division on the cross section, whereas the surface has a fibrill effect only with the fiber hair (C), or only the resin wool has a fibril effect in synthetic leather.

The result of the present invention is that the fine hairs and pores formed by raising the brushed seedlings and immersed in water and then slowly releasing the solvent from the water-curable resin form the resin wool layer and the porous layer by forming the lamellar bath by the post-processing polishing. The cross section in which the raising layer is mixed is formed.

If the conventional drying process is used instead of the underwater immersion process, each resin layer is densified to include the to-be-finished material, and it is not stiff and flexible, and the polishing process is not smooth, and thus it is not sufficient to generate resin hair.

Particularly suitable concentrations of DMF contained in the water when submerged are in the range of 12 to 30%. The concentration of DMF in the immersion tank is increased because DMF in the coating liquid is continuously extracted and supplied during continuous operation. Manage by supplying water to maintain a constant concentration.

At this time, if the concentration of DMF is set too low and the concentration is too low, the pores may be formed largely and the adhesive property may be degraded.Only the surface may be solidified rapidly and the internal solvent may not be easily extracted. In addition, when the water managed to be maintained at a certain concentration is excessively collected, it is collected and re-used for refining treatment, and the treatment cost is high, which may lower economic efficiency.

On the contrary, if the DMF concentration is too high, the solvent in the water-curable resin is not easily extracted, the coagulation is slowed down, the productivity decreases, and the size of the cell becomes smaller, resulting in shorter hair length. The concentration should be controlled within 8-35% in consideration of these various site conditions or the mixing ratio of the hydraulic resin solution. A particularly suitable concentration is 12 to 30% concentration.

6. Defensive

Solvent in the product coagulated during submerged water basically contains a solvent above the DMF concentration of the immersion tank. It is preferable to completely extract the remaining solvent by washing with water, since the remaining solvent is activated to melt the cells formed by drying, which causes defects such as surface irregularities and surface hardening.

It is effective to wash the water several times. As the washing process progresses, water with low solvent content is gradually supplied. At the final stage, the water is washed with ordinary water containing little solvent, and the temperature of the washing water is 35-85 degrees Celsius. It is desirable to manage.

7. Polishing

After washing with water to remove the remaining water by hot air drying and the like, and then polish the surface with a sand paper (sand paper) roller.

When only the primary coating of the water-curable resin solution is removed, a portion of the resin layer of the epidermis is removed by polishing, opening up a myriad of fine pores and exposing it to the surface, and at the same time, they form a resin hair by polishing them. The product having the characteristics of the present invention is produced by having the brushed hair, the opening, and the resin hair cultivated through this process together.

In the case of coating the first and second water-curable resin solutions, the ingrown seedlings are exposed to the surface through the polishing process, and the conventionally used seedlings such as fiber wool and leather powders have high strength and remain long due to their weakness in polishing. There is a fibril effect.

Next, the present invention will be described in detail through examples.

Example 1 Preparation of Artificial Nubuck Film Using PET Single Component Microfiber Short Fiber

In Example 1 according to the method of the present invention was carried out to produce a nubuck leather effect by using a microfiber short fibers having a small particle size of the seedlings.

Microfiber short fibers are 0.2mm fine with 0.2dena fineness. This is because the particle size is small, so that it is easy to settle in the water-based curable resin solution was coated only the first water-curable resin solution, it was carried out without coating the second water-curable resin solution.

Note that the illustrated data is not a fixed value but can be converted within a certain range.

1. Preparation of hydrocurable resin solution

A) Mixing ratio of hydraulic resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

1 part by weight of anion surfactant

2 parts by weight of nonion surfactant

Toning pigment 10 parts by weight

11 parts by weight of dimethylformamide

First, a dilute solvent, dimethylformamide (DMF), a wet polyurethane resin, the surfactant, and a pigment were added to the mixture, and then defoamed with a deaerator to prepare a hydraulic resin solution.

2. Preparation of medium

The medium is 0.15mm thick polyester high density film, pretreated with dry polyurethane resin to maintain the proper peel strength on the surface.

3. Water-curable resin solution coating

A precured medium is coated with a liquid resin solution (silver layer solution) in an amount of 650 g / m 2.

4. Planting

The PET fiber powder of 0.2 denia fineness cut into 0.2 mm length was supplied by a separate feeding device on the coated resin, and then adhered by electrostatic hair method, and the density was controlled by hitting the lower part of the medium with a beater.

Excess fiber is removed by a vacuum inhaler. Unbridled fiber hair remaining on the surface may interfere with the uniform effect and change the monolayer structure, which is undesirable.

Two minutes after planting, the fiber powder of the planted surface was settled into the primary solution, and the resin occupied more surface area than the fiber powder.

5. Underwater Immersion

It was immersed for 7 minutes in 27 degreeC solidified water in which 25% of DMF was diluted.

The solvent of the wet polyurethane resin has excellent affinity with water, and the high DMF concentration of the coated resin layer leads to the relatively low concentration of water, resulting in substitution with water, and the wet polyurethane resin in contact with water solidifies. do.

At this time, a number of fine pores are formed in the resin layer, and the openings are formed in the place where air escapes from the surface.

6 flush

The resin was taken out by coagulation in water, and the residual solvent (DMF) was removed by immersion-pressing-immersion-pressing in 50 ° C of washing water.

7 polishing

The washed water was dried by hot air, and then polished with 120 sandpaper rolls to open the microcells formed during the water immersion and to allow the embedded fiber powder to protrude.

8 Aftertreatment

After peeling and separating the medium and the formed film, 100 parts by weight of a urethane-based surface treatment agent (5% solids) and 200 parts by weight of methyl ethyl ketone (MEK) dilution solvent) were treated with 150 mesh rolls and dried to prepare a product of the present invention. Completed.

Thus, the film product of Example 1 has about 80% of the surface area of the wet resin wool and about 20% of the microfiber short fibers are distributed to maintain the natural buckwheat touch of the conventional wet film, while the surface of the fiber hair complements the FIBRIL effect. A leaky film was made.

The product of the present invention combines the advantages of a wet polyurethane film and a wool film product, and has become a new brushed artificial leather product.

Example 2 Preparation of an artificial suede film using nylon / polyester bicomponent mixed micronized short fibers (bicomponent split microfiber)

In Example 2, the surface effect is designed to have a suede effect by applying a long and long grained specimen.

The seedlings are nylon / polyester bicomponent mixed ultra-fine short fibers, more specifically, 2.5 deniers of fineness of nylon and polyester repeatedly laminated structure, 0.5 mm of monofilament, and after splitting, 7 strands of nylon 0.13 denier and 6 strands of polyester 0.25 denier It was tested with a split microfiber which is divided into ultra fine.

In particular, 0.3 mm or more was not available due to problems such as agglomeration or filtration when mixed with a conventional resin mixing type, but in Example 2, the length of the fur was long on the surface of the finished product using 0.5 mm.

In the present invention, the size of the fineness and the island length is a characteristic that cannot be uniformly uniformized due to the characteristics of the manufacturing process, and the numerical limitation refers to the size of the main component and the average.

In addition, in Example 2, since the particle size of the seedlings is large, it is difficult to include the first coating-based curable resin solution only by self-sedimentation, so that the second coating-coupling resin solution is applied to the resin layer.

1. Preparation of 1st and 2nd coating hydrocurable resin solution

A) Mixing ratio of primary coating water-curable resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

1 part by weight of anion surfactant

2 parts by weight of nonion surfactant

Toning pigment 10 parts by weight

12 parts by weight of dimethylformamide

First, a diluting solvent, dimethylformamide (DMF), a wet polyurethane resin, the above-mentioned surfactant and pigment were added, mixed, and degassed with a deaerator to prepare a hydraulic resin solution (silver layer solution).

B) Mixing ratio of the secondary coating water-curable resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

1 part by weight of anion surfactant

2 parts by weight of nonion surfactant

Toning pigment 15 parts by weight

150 parts by weight of dimethylformamide

The dilution solvent ratio was raised to low viscosity to increase the flowability of the liquid.

2. Preparation of medium

The media was a 0.15 mm thick polyester high density film.

3. First coating of water-curable resin solution

The media is coated with an amount of 750 g / m 2 primary coating water-curable resin solution.

4 seedlings

It is a monofilament of 2.5 denier and 0.5 mm of fineness with nylon and polyester repeatedly laminated structure. The density was adjusted by sticking in a distributed hair mode while feeding the feeder and immersing the lower part of the medium with a beater.

Excess fiber is removed by a vacuum inhaler. If unbridled fiber hair remains on the surface, it will not only prevent the uniform penetration of the secondary coating hydraulic resin solution, but also change the monolayer structure, which is undesirable.

The solvent of the wet type polyurethane resin has a high concentration of DMF in the resin layer coated with DMF which has excellent affinity with water to escape into the water of relatively low concentration, so that the substitution with water occurs and the wet type polyurethane resin which is in contact with water solidifies. do.

5. Application of the second hydraulic resin solution

After 2 minutes, the cultivated fibroblasts had settled down to occupy most of the surface.

The secondary coating water-curable resin solution thus prepared was coated at 400 g / m 2 on the seedling monolayer by the spray coating method. The whole surface was apply | coated uniformly so that the planted fibrous hair might not leave.

6. Submerged Coagulation

The resin was coagulated by immersion for 7 minutes in 26 ° C solidified water diluted with 25% DMF.

7. Defensive

The coagulated product was taken out and the residual solvent (DMF) was removed by immersion-pressing-immersion-pressing at 50 ° C of washing water.

8. Drying, Polishing

The washed water was dried with hot air at 100 ° C., and then polished with 100 wood sandpaper rolls to open pores of the formed pores, and at the same time, the contained fiber powder protruded.

9. Post-treatment

After peeling and separating the medium and the formed film, 100 parts by weight of a urethane-based surface treatment agent (composition with 3% solids) and 250 parts by weight of methyl ethyl ketone (MEK) diluent) were treated with 120 mesh rolls and dried to prepare a product of the present invention. Completed.

The surface of the film product of Example 2 made in this way coexisted with the holed and polished resin wool and the raised protruding brush when 0.5 mm long fiber was polished, and the length of the brush was long, so the volume was good and the fibril effect was good. It became.

Example 3 Preparation of Suede Artificial Leather Using General Nonwoven Fabric Fiber and Nylon / Polyester Two-Component Mixed Microfiber Short Fiber (Bi-component Split Microfiber)

Example 3 is an example of manufacturing a suede artificial leather having a thickness of about 1.3mm.

There is a so-called skin suede manufactured in the order of impregnation-coagulation-washing-drying-polishing of a polyurethane resin after dyeing and brushing nylon or polyester tricot fabric from synthetic leather by conventional techniques. This is due to the nature of the fabric structure, the weight of the fabric is high compared to the thickness and the tear strength is weak. In other words, the weight must be increased in order to increase the physical properties, and the cost is increased by using the same material as the entire material in order to produce a characteristic brushing effect on the surface.

According to the technology of the present invention, since the general nonwoven fabric can be selected freely according to the thickness and weight of the target material, and only the surface is processed, various products can be produced freely from various conventional pharmaceuticals.

1. Preparation of nonwoven fabric

Prepare a general purpose nonwoven fabric for synthetic leather with a component ratio of nylon / polyester of 60/40 and a weight of 210 g / m2 and a thickness of 1.2 mm.

This amounts to 60% of the weight of the tricot fabric for skin suede and 1.5 times the tear strength.

2. Preparation of Primary Coated Hydrocurable Resin Solution

A) Mixing ratio of the primary coating solution of the water-curable resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

1 part by weight of anion surfactant

2 parts by weight of nonion surfactant

Toning pigment 10 parts by weight

12 parts by weight of dimethylformamide

Since the primary coating water-curable resin solution plays a role of a main adhesive while forming a silver layer, it is preferable to degas so as to form a uniform coating film.

First, a diluting solvent, dimethylformamide (DMF), a wet polyurethane resin, the above-mentioned surfactant and pigment were added, mixed, and degassed with a deaerator to prepare a primary coating hydraulic resin solution.

B) Preparation of secondary coating water-curable resin solution

100 parts by weight of a wet polyurethane solution (30% solids)

1 part by weight of anion surfactant

2 parts by weight of nonion surfactant

Toning pigment 10 parts by weight

200 parts by weight of dimethylformamide

3. Primary coating water-curable resin solution coating

The prepared non-woven fabric was coated by impregnating the first coating water-curable resin solution in an amount of 350 g / m 2, coagulating and ironing with a 160 degree calender roll, and then coating the first coating water-curable resin solution in an amount of 850 g / m 2 again. .

4. Planting

Nylon / polyester bicomponent mixed ultra-fine fibers The finely divided microfibers) were fed onto the coated resin as a separate feeding device, and then adhered by the electrostatic cap method, and the density of the media was adjusted by hitting the lower part of the medium with a beater.

Excess fiber is removed by a vacuum inhaler. If the unbridled fiber hair remains on the surface, it prevents the uniform penetration of the secondary coating hydrocurable resin solution as well as changes the monolayer structure, which interferes with a predetermined purpose.

The solvent of the wet type polyurethane resin has a high concentration of DMF of the resin layer coated with DMF which has a good affinity with water to escape into the water of relatively low concentration, so that the substitution with water occurs and the wet polyurethane resin which is in contact with water solidifies. do.

5. Second application of water-curable resin solution

The prepared water-based curable resin secondary coating solution was coated at 400 g / m < 2 > The whole surface was apply | coated uniformly so that the planted fibrous hair might not leave.

6. Coagulation

It solidified for 7 minutes in 26 degreeC solidified water in which 30% of DMF was diluted.

7. Defensive

The coagulated product was taken out and the residual solvent (DMF) was completely removed by immersion-pressing-immersion-pressing at 50 ° C of washing water.

8. Polishing

The washed water was dried with hot air at 100 ° C., and then polished with 100 wood sandpaper rolls to open the formed microcells, and at the same time, the contained fiber powder protruded.

9. Post-treatment

After peeling and separating the media and the formed film, 100 parts by weight of a urethane-based surface treatment agent (composed of 13% solids) and 300 parts by weight of methyl ethyl ketone (MEK) diluent) was treated with 120 mesh rolls and dried to prepare the product of the present invention. Completed.

In the product of Example 3 thus made, the finished product had a thickness of about 1.3 mm and a tear strength of 5 kg or more. The wet resin hair and microfiber short fibers are distributed on the surface to compensate the pulling effect of the fiber fibers on the surface, while maintaining the natural silky texture superior to the existing skin suede cloth. In particular, 0.5mm long fiber protrudes long when polished, so the surface effect shows the same effect as suede.

The result of the embodiment is an example confirming that the technology of the present invention can be deployed in various genres of products.

Comparing the characteristics of the commercial product and the product according to the present invention produced by the prior art is as follows, it can be seen that the present invention is an excellent product utilizing all the advantages of the prior art.

If this is expressed as level, it is as follows.

The present invention has the effect of providing a novel manufacturing method of brushed artificial leather.

The present invention is a method of solidifying and aging an adhesive for adhering the material (fiber pile, leather powder) to the substrate in flocking in the method of manufacturing artificial leather in which the wool exists on the surface It is characterized by solidifying and bonding the water-curable resin in water using the water-curable resin.

The present invention is to understand the characteristics of each unit process well and combine them boldly and closely to maximize the effect by utilizing only the advantages in the prior art.

The present invention has the effect of providing a brushed artificial leather of a new physical property.

The surface is not just a cow, but the open cell, resin wool and cow coexist, and their proper complementary relationship is a new kind of material effect such as soft touch, writing effect, improved abrasion, dye transfer, etc. ) Is effective in providing a product.

The present invention has the effect of generalizing the manufacturing process.

Specifically, the material to be laminated, that is, short fibers, leather powder, and the like can be widely applied in kind, fineness, and island length. That is, it is possible to easily stack the workpieces without restrictions such as mixing and filtration. As a result, the surface effect can be produced in a variety of ways, and the range of materials can be extended to the range of textile products or artificial leather.

The present invention provides a framework to evolve into a variety of new new technologies.

In addition to the diversification of materials, the scope of application can be expanded, which will be a catalyst for new technology, which will be a vital energy for the development of related industries.

Enumerating the effects of the present invention is as follows.

Claims (7)

1. A method of manufacturing a brushed artificial leather, comprising: a first coating step of coating a substrate with a curable resin solution containing a hydrocurable polyurethane resin solution, a surfactant, a pigment, and a DMF (dimethylformamide) diluent; A hair transplanting step of planting the planting material in the primary coated resin solution; Solvent extraction and coagulation step of immersing the planted thing in water containing 8-35% of DMF to extract the solvent of the water-curable resin solution and to solidify the water-curable resin solution; And a resin wool forming step of polishing the solidified resin layer to form a resin hair. The method according to claim 1, After the second planting step, after adding a secondary coating step of the second coating step on the seedling layer with a water-curable resin solution containing a hydrocurable polyurethane resin solution, a surfactant, a pigment and a DMF diluent, 2 Method of manufacturing a brushed artificial leather, characterized in that the tea-coated thing is immersed in water, followed by the solvent extraction and solidification step. The method of manufacturing a brushed artificial leather according to claim 1 or 2, further comprising a washing step and a drying step after the solvent extraction and solidification step. The method of manufacturing a brushed artificial leather according to claim 1, wherein the method of weaving in the weaving step comprises an electrostatic wool method or a distributed wool method. The method of manufacturing a brushed artificial leather according to claim 2, wherein the viscosity of the water-curable resin solution at the time of the second coating is lower than that of the water-curable resin solution at the time of the primary coating. delete The method of manufacturing a brushed artificial leather according to claim 2, wherein the coating method of the second coating step comprises a spray coating method or a knife coating method on a back-up roll.

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