KR20230140124A - Manufacturing method of silicon synthetic leather that embodies the high sensitivity of natural leather and its silicon synthetic leather - Google Patents

Abstract

The present invention relates to a manufacturing method of silicone synthetic leather embodying high sensitivity of natural leather by using a silicone coating agent, and a silicone synthetic leather thereof. In the present invention, a manufacturing method of silicone synthetic leather embodying high sensitivity of natural leather by using a silicone coating agent, and a silicone synthetic leather manufactured thereby are disclosed. The manufacturing method comprises: a first step which prepares release paper with a specific pattern, coats a surface coating agent on the release paper to have a thickness of 5-10 ㎛ to coat the same by a knife coating method, and dries the same in a dryer for 2-3 minutes at a temperature range of 100-120 ℃ to form a surface coating (SF) resin layer; a second step which coats silicone rubbers in a liquid state on the SF resin layer of the first step to have a thickness of 50-150 ㎛ and dries the same in the drier for 2-3 minutes at a temperature range of 120-130 ℃ to form a silicone rubber layer; a third step which stacks a hot melt film on a top surface of the silicone rubber layer of the third step and a base fabric on a top surface of the hot melt film, laminates the same and pressurizes and heats the same to form synthetic leather; and a fourth step which peels the release paper in the third step and winds the formed synthetic leather.

Description

Manufacturing method of silicon synthetic leather that embodies the high sensitivity of natural leather and its silicon synthetic leather {Manufacturing method of silicon synthetic leather that embodies the high sensitivity of natural leather and its silicon synthetic leather}

The present invention relates to a manufacturing method of silicone synthetic leather that realizes the high sensitivity of natural leather and the silicone synthetic leather, and more specifically, to a silicone synthetic leather that can realize the surface texture of high-quality natural leather while being lightweight and competitively priced. It relates to manufacturing methods and silicone synthetic leather.

[National research and development project that supported this invention]: 2021 Gyeonggi-do textile (leather) enterprise project

Promotion technology development project

[Assignment number]D2121003

[Ministry Name] Gyeonggi Science and Technology Promotion Agency

[Name of project management (professional) organization] Gyeonggi Province Economic and Science Promotion Agency

[Research project name] Gyeonggi-do textile (leather) enterprise business promotion technology development project

[Research project name] Silicone synthetic leather production process development and product development that realizes the high sensitivity of natural leather

[Contribution rate]1/1

[Name of project carrying out organization] Jeil Hwaseong Co., Ltd.

[Research period] 2021.05.01 ~ 2022.04.30.

Polyurethane coating (wet and dry), which is the main material for existing synthetic leather, is mainly produced using organic solvents. However, as VOC emission regulations are being strengthened, the development of synthetic leather using water-based polyurethane or silicone as a coating material for synthetic leather is actively underway.

PU (Polyurethane) synthetic leather is manufactured using wet and dry methods, backing cloth, microfiber non-woven fabric, woven fabric, etc., and laminating coating method. Among synthetic leathers, it is used as a replacement for natural leather in the most diverse fields, but organic solvents such as M.E.K. and D.M.F. are used during production. When used in indoor interior materials, it is pointed out as a major factor causing various problems such as atopy and respiratory diseases due to VOCs emissions.

Accordingly, the development of synthetic leather using silicone, an inorganic material, along with bio materials, among eco-friendly materials that replace PU or PVC, is actively underway.

However, due to the technical limitations of the current silicone coating process, it is being used in a wider variety of textile fields, especially fields that require high sensitivity, such as synthetic leather for IT cases (headsets, laptops, cell phone covers, etc.), mats for infants and children, golf gloves, and fashion accessories. It cannot be used in fields that require softness and high sensitivity. Currently, the limitation of silicone synthetic leather is that it is applied to furniture interior materials and automobile interior materials (some).

Republic of Korea Patent Publication No. 10-1789886 Republic of Korea Patent Publication No. 10-1955243 Republic of Korea Patent Publication No. 10-2083631 Republic of Korea Patent Publication No. 10-1381914

Currently, silicone-coated fabrics such as silicone synthetic leather are being developed recently, but the reality is that progress in developing silicone coatings that meet the specifications required in various fields that meet high production costs and high sensitivity is very slow. Accordingly, there is an increasing need for highly sensitive synthetic leather that can be applied to various fields by taking advantage of the advantages of silicon. In order to respond to this need, the present invention provides a product that can achieve lightweight and competitive prices while realizing the surface texture of high-quality natural leather. The goal is to provide a manufacturing method for silicone synthetic leather that realizes the high sensitivity of natural leather.

In addition, the present invention provides a manufacturing method that can produce lightweight silicone synthetic leather while maintaining the existing quality in line with the quality and lightweight trend of silicone synthetic leather, especially in order to meet consumer demands for highly sensitive synthetic leather products. Make it a problem to solve.

In addition, another problem of the present invention is to provide silicone synthetic leather that can satisfy customized coating quality tailored to the various needs of consumers.

The method for manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather according to the present invention, which solves the above problems, prepares a release paper with a specific pattern, and applies a surface coating agent to the release paper to have a thickness of 5 to 10㎛. A first step of forming a surface coating (SF) resin layer by applying and coating using a knife coating method and then drying in a dryer at a temperature range of 120 to 130° C. for 2 to 3 minutes;

Liquid silicone rubber is coated on the surface coating (SF) resin layer of the first step to a thickness of 50 to 150㎛, and then dried in a dryer at a temperature range of 120 to 130°C for 2 to 3 minutes to form a silicone rubber layer. The second step is to do;

A third step of laminating a hot melt film on the upper surface of the silicone rubber layer of the third step, laminating a base fabric on the upper surface of the hot melt film, laminating them, and then pressurizing and heating to form synthetic leather; and

It is characterized by comprising a fourth step of peeling off the release paper of the third step and winding the formed synthetic leather.

Here, after the third step, the method further includes forming a silicone primer layer by coating a silicone primer on the upper surface of the silicone rubber layer to a thickness of 8 to 10㎛.

Here, the surface coating agent in the first step is a mixture of 65 to 85 parts by weight of a liquid silicone resin with a shore hardness of 80 or more and 15 to 35 parts by weight of spherical silicon beads with a particle size distribution of 5 to 10㎛. It is a silicon skin formulation, and is characterized by using a monodisperse treatment of the silicon beads.

Here, the silicone rubber of the third stage has adhesiveness that satisfies the physical properties of LSR selection suitable for BACKING CLOTH such as POLYESTER OR NYLON, WOVENE, etc. #8371 (Manufacturer: Siltrend, Product name: ST-8371, Compound name: Siloxanes and Silicones, di-Me, Me vinyl, vinyl group-terminated) or #8077 (Manufacturer: Sejin Silicone, Product name: SL-8077, Compound name: Siloxanes and Silicones, di-Me, Me vinyl, vinyl group-terminated) It is characterized by using any one selected.

Here, the hot melt film satisfies the physical properties of SH55*1050 (manufacturer: Sambu Hot Melt, product name: SH55*1050) and SH60*1100 (manufacturer: Sambu Hot Melt, product name: SH60*1050), which uses poly blended urethane. It is characterized by

In addition, in the present invention, it is manufactured by any one of the above manufacturing methods, and the silicone coating layer has a thickness of 150 to 300 ㎛, a tensile strength of 1.2 to 2.0 kg/inch, an elongation of 520 to 900%, a coating weight of 150 to 300 g/㎡, We provide silicone synthetic leather that satisfies the leather thickness of 0.15~0.90mm and realizes the high sensitivity of natural leather.

The method for manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather provided according to the present invention can provide silicone synthetic leather that can replace existing high sensitivity natural leather products, especially lamb skin or young calf skin. There is an effect.

In addition, the silicone synthetic leather provided according to the present invention has the effect of being applied to a variety of products such as IT product covers such as cell phone covers, laptop covers, and synthetic leather for camera cases, and fashion accessories such as golf gloves, pouches, and synthetic leather for handbags. .

Figure 1 shows one process of the manufacturing method of silicone synthetic leather that realizes the high sensitivity of natural leather of the present invention.
Figure 2 illustrates the structure of synthetic leather manufactured according to the manufacturing method of the present invention.
Figure 3 illustrates the structure of synthetic leather manufactured according to the manufacturing method of another embodiment of the present invention.

Hereinafter, the present invention will be described in more detail.

The accompanying drawings, Figure 1, illustrate a process for manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather of the present invention, and Figure 2 illustrates the structure of synthetic leather manufactured according to the manufacturing method of the present invention. , Figure 3 illustrates the structure of synthetic leather manufactured according to the manufacturing method of another embodiment of the present invention.

The manufacturing method of silicone synthetic leather that realizes the high sensitivity of natural leather according to the present invention will be described with reference to the attached drawing FIG. 1. In this case, a release paper with a specific pattern is prepared, and a surface coating agent is applied to the release paper with a thickness of 5 to 10 ㎛. The first step is to form a surface coating (SF) resin layer by applying it to a thickness and coating it using a knife coating method, and then drying it in a dryer at a temperature range of 100 to 120°C for 2 to 3 minutes;

Liquid silicone rubber is coated on the surface coating (SF) resin layer of the first step to a thickness of 50 to 150㎛, and then dried in a dryer at a temperature range of 120 to 130°C for 2 to 3 minutes to form a silicone rubber layer. The second step; and

A third step of laminating a hot melt film on the upper surface of the silicone rubber layer of the third step, laminating a base fabric on the upper surface of the hot melt film, laminating them, and then pressing and heating them through a heating roller to form synthetic leather; and

It is characterized in that it includes a fourth step of peeling off the release paper of the third step and winding the formed synthetic leather.

According to the present invention, after the second step, in order to improve the bonding strength of the hot melt film with the silicone rubber layer, a silicone primer is coated on the upper surface of the silicone rubber layer to a thickness of 50 to 60㎛ to form a silicone primer layer. More may be included. At this time, it is desirable to use the silicone primer that satisfies the bonding strength of the BACKING CLOTH and SILICONE layers.

If the coating thickness of the silicone primer is less than 50㎛, there may be an adhesion problem, and if it exceeds 80㎛, there may be layer separation and impregnation problems.

According to the present invention, if the coating thickness of the surface coating agent in the first step exceeds the critical value, there may be a disadvantage in that the coating surface is broken or crumbled or penetrates the R/P surface, making peeling difficult. After coating the surface coating, if the drying temperature is outside the critical range, the coated part in the pattern may disappear in an uncured state, or if curing is rapid, there may be a problem of separation from the next COATING SILICONE, and the drying time may also occur. If it is outside the threshold range, there may be problems such as layer separation or patterns not appearing clearly.

In addition, if the coating thickness of the silicone solid layer formed in the second step exceeds the critical value, there may be a disadvantage in that it may be separated from the first-step silicone layer or penetrate into the first-step silicone layer, making surface peeling difficult, and the silicone rubber coating Afterwards, if the drying temperature and time are outside the critical range, there may be problems such as a decrease in adhesive strength or a layer separation phenomenon.

According to the present invention, in the third step, the hot melt film and the base fabric are laminated and then laminated while being transferred through a normal heating roller. Preferably, the lamination temperature of the heating roller is in the temperature range of 80 to 100 ℃. It's good that it happens. If the joining temperature is less than 80℃, there is a disadvantage that the diluent mixed with silicone cannot evaporate, and if it exceeds 100℃, there is a disadvantage that the adhesive strength to the fabric is reduced due to complete curing.

According to the present invention, preferably, the surface coating agent in the first step includes 50 to 60 parts by weight of a liquid silicone resin with a Shore Hardness of 80 or more and 50 to 40 parts by weight of spherical silicon beads with a particle size distribution of 10 to 20㎛. A silicon skin formulation mixed by weight is used, and more preferably, a silicone skin formulation obtained by monodispersing the silicon beads is used.

At this time, if the mixing amount of the spherical silicon beads is less than 5 parts by weight, there is a disadvantage in that it is TACKEY, and if it exceeds 10 parts by weight, there may be a problem of surface cracking.

According to the present invention, the silicone rubber of the third step is preferably one that satisfies the physical properties of hardness of 18 degrees and elongation of 960%.

According to the present invention, the hot melt film is poly blended urethane, hot melt, etc., and poly is used as a non-stretch type, and blended is used as any one selected from the group of about 250% stretch rate and 450% urethane.

According to the present invention, the base fabric combined in the third step is any one selected from the group consisting of poly fabric, SPAN fabric, blended fabric, cotton fabric, T/C, etc.

The manufacturing method according to the present invention disclosed above satisfies the following requirements: silicone coating layer thickness of 100-300㎛, tensile strength of 1.2-2.2kg/inch, elongation of 250-450%, coating weight of 150-350g/㎡, and leather thickness of 450-900mm. We can provide silicone synthetic leather that realizes the high sensitivity of natural leather.

As shown in Figure 2, the silicone synthetic leather that realizes the high sensitivity of natural leather includes a surface coating (SF) resin layer (10), a silicone rubber layer (20), a hot melt film (40), and a base fabric ( 50) may be sequentially coated and laminated to have a composite structure, and on the other hand, as shown in FIG. 3, in order to increase the adhesion between the silicone rubber layer 20 and the hot melt film 40, the silicone rubber layer 20 ) and the hot melt film 40 may be formed by further forming a silicon primer layer 30.

Hereinafter, the present invention will be described in more detail through preferred embodiments. However, the example described below is an example to explain the present invention, and the present invention is not limited to the following example, and can be understood by those skilled in the art without departing from the scope of the invention as set forth in the patent claims. It can be modified to any extent.

[Example 1]

<Preparation of raw materials>

1. Surface coating (SF) resin:

It is a silicon skin formulation that mixes 80 to 90 parts by weight of a liquid silicone resin with a shore hardness of 80 or more and 10 to 15 parts by weight of spherical silicon beads with a particle size distribution of 10 to 15㎛. Silicon beads were prepared by monodisperse treatment.

2. Silicone rubber:

SL8, 3811, 6380, and 37007 were prepared to satisfy the physical properties of hardness of 50 degrees and elongation of 600%.

3. Hot melt film: 70% poly, 30% urethane blend HOTMELT

4. Base fabric: INTERLOCK 280G

<Manufacturing process>

As shown in Figure 1, release paper with a specific pattern is prepared, a surface coating agent is applied to the release paper to a thickness of 5-10㎛, coated using a knife coating method, and then dried in a dryer at 100-120°C. Dry for 3 minutes in the temperature range to form a surface coating (SF) resin layer, then coat the surface coating (SF) resin layer with liquid silicone rubber to a thickness of 50 to 150㎛, and then dry in a dryer for 120 to 130 degrees Celsius. It was dried for 3 minutes at a temperature range of ℃ to form a silicone rubber layer.

Next, a hot melt film is laminated on the upper surface of the silicone rubber layer, a base fabric is laminated on the upper surface of the hot melt film, and then passed through a heating roller and heated under pressure for 5 minutes at a temperature of 130 to 140 ℃ to form silicone-coated synthetic leather. was formed, the release paper was peeled off, and the prepared silicone-coated synthetic leather was wound.

[Example 2]

DY39-O67 was prepared as a silicone primer between the silicone rubber layer of Example 1 and the hot melt film, and the prepared silicone primer was coated on the silicone rubber layer to have a thickness of 20 to 50㎛. Silicone-coated synthetic leather was manufactured in the same manner as in 1.

Prototype samples of each silicone-coated synthetic leather prepared in Example 1 and Example 2 were prepared, and a physical property test was performed to evaluate the performance of the synthetic leather. The results are shown in Table 1 below.

Evaluation items
(Main performance, physical properties, etc. Spec) unit
Example 1 Example 2 ① High sensitivity class ② Coating weight (lighter) g/ ^m2 ③ Product thickness mm ④ Fastness to rubbing (dry) class ⑤ Fastness to rubbing (humidity) class ⑥ Fastness to friction (sweat) class ⑦ wear resistance class ⑧ tensile strength kg/inch ⑨ elongation % ⑩ heavy metal ppm ⑪ 6 major hazardous substances ppm

The test methods for the evaluation items in Table 1 above are shown in Table 2 below.

Evaluation items Evaluation criteria (standards) Assessment Methods Highly sensitive performance Silicone synthetic leather prototype Total value (THV) was measured by measuring the tensile, bending, compression, and surface properties of silicone synthetic leather coated prototypes using the Kawabata system. Coating weight measurement comparison (g/ ^m2 )
Comparison with silicone synthetic leather for furniture Measure and compare the weight of major domestic and foreign 100% silicone synthetic leather coatings
After comparing and measuring only the coating weight excluding B/C (fabric base material), check whether the coating weight is less than 50% and the correlation between the coating layers Product thickness measurement comparison (mm)
Comparison of product thickness with artificial leather for polyurethane headset covers Product thickness comparison measurement with the thickness of artificial leather for domestic and overseas headset covers. Thickness including B/C fabric is mainly compared with wet/dry products and highly sensitive silicone synthetic leather fabric. Fastness to rubbing (dry)
Friction fastness (wet)
Fastness to friction (sweat) (KS M 6882)
Evaluation of friction fastness of synthetic leather surface There are three types: dry test, wet test, and sweat test, and both can be tested as needed. If the test piece is fabric, the size of the test piece is a rectangle of 200mm . After tightly wrapping the friction element with a load of 900g in white cotton cloth, it is rubbed back and forth 10 times for 10 seconds between 100mm on the test piece, and graded according to KS K ISO 105-A01. wear resistance (ASTM D3884)
Evaluation of abrasion strength of synthetic leather surface Evaluation with Taber abrasion tester
(Wear wheel CS-10, load 1,000g, 2,000 times) tensile strength (ASTM D1682)
Maximum tensile strength of synthetic leather This is the value when the specimen (length 250mm, width 30mm) is ruptured after being mounted on a universal testing machine and stretched at a tensile speed of 200mm/min. heavy metal,
Hazardous Substances (MS 201-02)
Analysis of 6 major hazardous substances remaining in synthetic leather ICP/AES analysis (Pb, Cd, Hg), UV/VIS analysis (Cr6 value),
GC/MS analysis (PBBs, PBDEs) VOC
(DMF,MEK,Toluene) (no standards)
Residual amount of VOCs remaining in artificial leather Extract the VOC remaining in the sample with a solvent and perform instrumental analysis
(GC-MS spectroscopy, detection limit is 10ppm)

Table 1 above shows the evaluation results. The silicone-coated synthetic leather provided by the manufacturing method according to the present invention utilizes the advantages of silicon to realize a high-quality natural leather surface texture that can respond to the needs of highly sensitive synthetic leather applicable to various fields. It was found that it was possible to provide silicone synthetic leather that realizes the high sensitivity of natural leather, which can be lightweight and achieve a competitive price.

In addition, in order to meet consumer demands for highly sensitive synthetic leather products, it is possible to produce lightweight silicone synthetic leather while maintaining the existing quality in line with the quality and weight reduction trend of silicone synthetic leather.

Lastly, there is the advantage of being able to provide silicone synthetic leather that can satisfy customized coating quality tailored to the diverse needs of consumers.

10: Surface coating (SF) resin layer
20: Silicone rubber layer
30: Silicone primer layer
40: Hot melt film
50: Base fabric

Claims (6)

Prepare release paper with a specific pattern, apply a surface coating agent to the release paper to a thickness of 5-10㎛, coat it using a knife coating method, and then dry in a dryer at a temperature range of 100-120°C for 2-3 minutes. A first step of forming a surface coating (SF) resin layer;
Liquid silicone rubber is coated on the surface coating (SF) resin layer of the first step to a thickness of 50 to 150㎛, and then dried in a dryer at a temperature range of 120 to 130°C for 2 to 3 minutes to form a silicone rubber layer. The second step is to do;
A third step of laminating a hot melt film on the upper surface of the silicone rubber layer of the third step, laminating a base fabric on the upper surface of the hot melt film, laminating them, and then pressurizing and heating to form synthetic leather; and
A method of manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather, comprising a fourth step of peeling off the release paper of the third step and winding the formed synthetic leather.
According to claim 1,
After the third step, silicone synthesis that realizes the high sensitivity of natural leather, further comprising coating the upper surface of the silicone rubber layer with a silicone primer to a thickness of 50 to 80㎛ to form a silicone primer layer. Method of manufacturing leather.
According to claim 1,
The surface coating agent of the first stage is a silicone mixture of 70 to 85 parts by weight of a liquid silicone resin with a shore hardness of 80 or more and 15 to 30 parts by weight of spherical silicon beads with a particle size distribution of 15 to 30㎛. A method of manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather, characterized by using a silicon skin formulation obtained by monodisperse processing the silicon beads.
According to claim 1,
The silicone rubber of the third stage satisfies the physical properties of 18 degrees of hardness and 900% elongation, #8371 (manufacturer: Siltrend, product name: ST-8371, compound name: Siloxanes and Silicones, di-Me, Me vinyl, Natural leather characterized by using either vinyl group-terminated) or #8077 (manufacturer: Sejin Silicone, product name: SL-8077, compound name: Siloxanes and Silicones, di-Me, Me vinyl, vinyl group-terminated) Manufacturing method of silicone synthetic leather that realizes high sensitivity.

According to claim 1,
The hot melt film satisfies the physical properties of SH55*1050 (manufacturer: Sambu Hot Melt, product name: SH55*1050) and SH60*1100 (manufacturer: Sambu Hot Melt, product name: SH60*1050) and is characterized by using poly blended urethane. A method of manufacturing silicone synthetic leather that realizes the high sensitivity of natural leather.
Manufactured by the manufacturing method according to any one of claims 1 to 5, the thickness of the silicone coating layer is 150 to 300㎛, the tensile strength is 1.2 to 2.2 kg/inch, the elongation is 250 to 450%, and the coating weight is 100 to 100. Silicone synthetic leather that realizes the high sensitivity of natural leather and satisfies 350g/㎡ and leather thickness of 450~900mm.