KR20240001728A - Method for manufacturing dyeable polypropylene yarn and functional fabric mixed with graphene - Google Patents

Abstract

The present invention includes the steps of spinning PP yarn and composite yarn including a graphene content of 0.005 wt.% and ~ 0.1 wt%; spinning recycled PP yarn and composite yarn incorporating the graphene; Dyeing and UV coating with high sunlight dye; Processing an eco-friendly water and oil repellent; coating the fabric with a nano-coating solution for surface treatment containing one or more of nanoclay, graphene, carbon nanotubes, graphene nanoplates, silver nano, nanodiamonds, and cellulose nanofibrils. step; A method of manufacturing a functional fabric including the step of coating the back side with a back coating agent, which can solve the problem of reduced washing fastness, which is a problem when coating graphene on the surface of the fiber, and complement the problem of reduced dyeability, which is a disadvantage of PP fiber. and can give graphene its unique properties.

Description

Method for manufacturing dyeable polypropylene yarn and functional fabric mixed with graphene}

The present invention relates to piece-dyeable polypropylene yarn and functional fabrics containing recycled polypropylene staple fiber and graphene.

PP has the optimal advantage for producing functional fibers, but its molecular structure is dense and hydrophobic, so it has the problem of poor dyeability, which is an important factor in clothing fibers. Although most of the polypropylene scrap generated in Korea is not realistically recycled and is only partially reused, there has been no development or commercialization of products that exhibit dyeability and functionality through mixing with graphene to date. . Therefore, there is a need to develop and sell non-clothing outdoor fabrics and automobile cover fabrics through high-daylight dyeing using recycled polypropylene staple fiber and graphene. Globally, PP and graphene are used by coating together, but when coating with graphene, the graphene coating can easily come off during washing, making it difficult to maintain washing durability.

The present invention maximizes the advantages of existing polypropylene fibers by adding graphene during the polypropylene fiber manufacturing process, reduces costs by using recycled polypropylene staple fiber, and provides a new polypropylene yarn and functionality that can be piece-dyed to reduce carbon emissions. The purpose is to manufacture textiles.

Through this research and development, the shortcomings of PP fiber's heat resistance and piece-dyeing properties can be corrected, and the problems of melting at 150 ℃ and the difficulty of piece-dyeing due to PP's unique molecular structure and hydrophobic characteristics can be solved.

The purpose is to develop the strength of the currently marketed PP filament yarn (5D, 40mm) to low denier strength (3D, 40mm) by incorporating graphene.

The purpose is to develop the strength of remarketed PP spun yarn (300D/45F grade) to low denier strength (200D/45F grade) by incorporating graphene.

The purpose is to manufacture 3-denier high-denier yarn that can be piece-dyed by adding recycled polypropylene staple fiber and graphene, and to weave 20-count Oxford fabric using 3-denier yarn.

In addition, the purpose is to produce recyclable outdoor non-clothing cushion bedding covers and car cover fabrics using high-day light dyeing and spray coating.

The present invention relates to a method for producing functional fabrics comprising:

Spinning PP yarn and composite yarn containing graphene content of 0.005 wt.%, ~0.1 wt%;

Spinning recycled PP yarn and composite yarn incorporating the graphene;

Dyeing and UV coating the fabric with a high sunlight dye,

Processing an eco-friendly water and oil repellent agent;

Coating the fabric with a nano-coating solution for surface treatment containing one or more of nanoclay, graphene, carbon nanotubes, graphene nanoplates, silver nano, nanodiamonds, and cellulose nanofibrils; and

A step of back coating with a back coating agent;

A method of manufacturing a functional fabric comprising.

Here, the spinning step is characterized by drying at 50 to 150°C, spinning temperature of 250°C to 260°C, and cutting length of 40 mm (±2).

In addition, it is characterized by spinning in the Ring Compact method.

Additionally, the dyeing step is characterized by washing in NaOH+MSA solution at 80°C for 20 minutes.

During the dyeing, a UV absorber is added together with the dye, and the dyeing temperature rise curve for stable dyeing and high sunlight fastness is characterized by a temperature increase rate (2 degrees/min) and treatment at 135°C for 60 minutes.

Meanwhile, when coating the back side, the air permeability is characterized as a minimum of 5 and a maximum of 50 or less.

Finally, a functional fabric incorporating graphene can be provided according to the above manufacturing method.

Through this research and development, by spinning polypropylene mixed with graphene, it is possible to solve the problem of reduced washing fastness, which is a problem when coating graphene on the fiber surface, and to complement the problem of reduced dyeability, which is a disadvantage of PP fiber. , can give graphene its unique properties. It is known that adding just 0.1% of graphene to PP material improves heat resistance by 30%, which can compensate for the shortcomings of PP fiber and further highlight its advantages.

By adding graphene to polypropylene fibers, the limitations of polypropylene fibers that cannot be dyed are overcome, and at the same time, new polypropylene fibers are manufactured, and the design and weaving of fabrics using manufactured yarns is carried out domestically and overseas through the dyeing post-processing process. It is possible to achieve the product that the market demands.

By applying graphene to recycled polypropylene fiber, it is made highly functional and adds value, and by applying graphene to recycle polypropylene scrap that is subject to disposal (incineration, landfill, etc.), it becomes highly functional and adds value, resulting in new sales and disposal through resource recycling. It can reduce costs and reduce _CO2 emissions that may occur during disposal.

Figure 1 is a diagram showing the entire manufacturing process of recycled dyed PP yarn and composite yarn work.
Figure 2 is a comparison table of Type1 and Type2 primary radiation.
Figure 3 is a comparison table of Type1 and Type2 secondary radiation.
Figure 4 is a comparison table of Type1 and Type2 tertiary radiation.
Figure 5 is a physical property table of graphene PP spun yarn
Figure 6 shows the lab-scale rPP/graphene film manufacturing process and physical property evaluation.
Figure 7 is a FE-SEM analysis of the fiber surface according to the rotation speed conditions of ultra-high-speed centrifugal spinning.
Figure 8 is a FE-SEM of a developed product to confirm the surface characteristics of rPP fabric according to dyeing and coating.
Figures 9 and 10 are photos of the contact angle evaluation of composite fabric (raw material/dyed sample/coated sample) according to dyeing and coating.
Figure 11 is a schematic diagram of physical property evaluation of the developed product.
Figures 12 and 13 are tables showing the physical properties of the yarn and fabric of the present invention.

One. graphene Improvement of analysis and radiation process

In order to effectively manufacture graphene coatings, we analyzed the use of volatile organic solvents that can easily dissolve organic compounds or polymers, and as a preliminary study to develop functional coating solutions, surface modification research was conducted to improve the dispersibility of each nanomaterial. Dispersibility was evaluated before and after modification depending on the solvent.

By referring to existing polyester fiber production facilities, we improved the process and developed technology to suit the characteristics of graphene PP fiber.

Problems and solutions of existing fiber lines

1) Surface roughness

Compared to polyester, PP has a poor surface roughness, so there was a problem with the yarn and fabric not being smooth. When spinning PP fiber, process improvement (spinning temperature, drying method) was used to maintain surface softness due to improved process efficiency. In addition, a soft touch was maintained due to the coating effect of the yarn due to the addition of graphene m/b.

2) Discharge pressure

During spinning, the correlation between the temperature settings of the cylinder heaters (h1 to h9) and the discharge amount was improved, and the drying temperature and belt speed were adjusted.

3) Hardening phenomenon

PP is a material with a low temperature (165℃) melting point, which requires temperature control that is different from that of existing polyester fibers (MAX TEMP: 260℃).

4) Cutting length

Controlling the cutting length of the fiber is very important in order to stably maintain the uniformity of the graphene PP fiber and improve the tensile strength during spinning. Therefore, the stability of the fiber was found by adjusting the cutting length of the PP fiber to between 40 mm (±2).

Graphene M/B development

PP with liquid graphene coating - graphene M/B production, cyclone method

Input M/B concentration suitable for our emitter - SIDE HOPPER input amount: up to 10%

Adoption of WHITE GRAPHRNR with minimal disruption to color expression when dyeing yarn and fabric

Establishment and analysis of radiation conditions

Spinning conditions were established by dividing them into Type 1 and Type 2 according to the Graphene M/B content.

Establishing PP fiber production goals

Applying a fiber production method for spinning to confirm the properties of graphene through first spinning.

Analysis of emulsion mixing conditions

Control of emulsion mixing amount, concentration, and purity

Emulsion Mixing Condition Table

radiation test

Depending on the Graphene M/B content, it was divided into Type 1 and Type 2, and the first spinning was performed according to the spinning condition table and emulsion mixing conditions.

Primary radiation condition table

Type1 primary radiation result

Type2 primary radiation result

○ Secondary radiation condition table

○ Type 1 secondary radiation result

○ Type 2 secondary radiation result

○ Problems and solutions during 1st and 2nd radiation

○ As graphene is contained, MI decreases at the same temperature.

○ As MI changes, the overall temperature conditions decrease.

○ Tertiary radiation condition table

○ Type 1 tertiary radiation result

○ Type2 tertiary radiation result

○ As a result of three spinning tests, it was confirmed that the graphene content was two times different, at 0.05% for Type 1 and 0.1% for Type 2, but there was no significant difference in the physical property results for all three times.

○ Therefore, considering economic value, cost-effectiveness, test report results, etc., we will proceed with mass production under Type 1 radiation conditions.

○ Final radiation condition table

○ Type1 final radiation result

○ Achievement of final PP fiber production goal

*Spun yarn production

100% spun yarn was manufactured using produced PP (3 denier, fiber length 40 mm) staple fiber. When spinning with the existing ring method, the pilling condition of the woven fabric was not good, so the spinning method was changed from Ring to Ring Compact.

Tensile and tension of yarn according to T/M changes weaving Spun yarn manufacturing for operation rate analysis

The processes of honta - carding - straight cotton - rolling - roughing - spinning - winding (product) were carried out sequentially.

Evaluate performance against quantitative objectives for final prototyping

- PP graphene spun yarn quantitative target

The physical properties of graphene PP spun yarn are shown in Figure 5.

2. graphene Dispersion and mixing

1) Research on establishing graphene dispersion and mixing recipe

2) Research on improving dispersibility through introduction of functional groups in graphene

Evaluation of dispersibility of graphene with or without modification

< graphene Modified or not and according to content rPP / graphene Nanocomposite film manufacturing and physical property evaluation>

A physical property evaluation was conducted to confirm changes in the physical properties of the nanocomposite film due to graphene modification. There was a significant difference before and after modification, and when graphene before modification was included, a decrease in tensile strength was confirmed, and it was confirmed that it decreased significantly as the content increased. This was confirmed to be the result of unmodified graphene not being uniformly dispersed within the polymer matrix and agglomerating. On the other hand, when modified graphene was included, it was confirmed that the tensile strength was improved even when a very small amount (0.005 wt.%) was included, and it was confirmed that it was significantly improved above 0.01 wt.% (see Figure 6).

<PP and rPP Optimal for matrix reinforcement graphene Establishing conditions>

3) graphene Optimization of distributed nanocomposite fiber spinning process

- During the nanocomposite fiber spinning process, a study was conducted to optimize the spinning process according to the bath ratio of the coagulation bath, and a study was conducted to control the fiber shape and physical properties by controlling the solidification speed by varying the rPP/graphene solvent:non-solvent ratio.

<Lab. scale rPP/graphene radiation (bark ratio=70:30)>

<Lab. scale rPP/graphene radiation (bark ratio=75:25)>

<Lab. scale rPP/graphene radiation (bark ratio=80:20)>

<Lab. scale rPP/graphene radiation (bark ratio=85:15)>

r PP / graphene nanocomposite fiber graphene content optimization

To confirm the optimal graphene content of the rPP/graphene nanocomposite fiber, the spinning behavior and physical property behavior according to the graphene content were confirmed. As the graphene content increased from 0.005 wt.% to 0.1 wt.%, the surface of the fiber became uneven due to graphene aggregation.

<Graphene content 0.005 wt.% fiber spinning process>

<Graphene content 0.01 wt.% fiber spinning process>

<Graphene content 0.05 wt.% fiber spinning process>

<Graphene content 0.1 wt.% fiber spinning process>

using centrifugal spinning rPP / graphene Manufacturing nanocomposite fibers and establishing optimal conditions

- rPP/graphene nanocomposite fibers were manufactured according to rotation speed (rpm) conditions during the ultra-high-speed melt centrifugal spinning process, and the properties of the nanocomposite fibers were evaluated according to the conditions.

The rotation speed was measured in the range of 6,000 to 10,000 rpm, and FE-SEM measurements were conducted to confirm surface characteristics, fiber diameter, and diameter distribution characteristics according to conditions. At low rotation speeds (6,000 rpm), it had a rough surface and a relatively thick average diameter (3 ㎛), while as the speed increased, the surface became smoother and the average diameter decreased. In addition, it can be seen that the variation in fiber diameter tends to decrease as the rotation speed increases. This can be confirmed as a result of the shear stress applied to the high-viscosity spinning melt becoming stronger as the rotation speed increases, resulting in a uniform fiber shape. You can.

rPP/graphene nanocomposite fibers were manufactured according to spinning temperature (°C) conditions during the ultra-high-speed melt centrifugal spinning process, and the properties of the nanocomposite fibers were evaluated according to the conditions. Temperature conditions were measured in the range of 240 to 260°C, and FE-SEM measurements were conducted to confirm surface characteristics, fiber diameter, and diameter distribution characteristics according to temperature conditions.

It was confirmed that fibers spun at low temperature conditions (240°C) had large fiber diameters and large diameter differences between fibers, while the fiber diameters became thinner at temperature conditions above 250°C. This appears to be the result of the melt not having sufficient flowability for spinning at 240°C (Figure 7).

4) Selection of functional nanoparticles and development of functional coating solution

<Evaluation of dispersibility of nanomaterials according to solvent and research on development of functional coating solution>

As a preliminary study to develop a functional coating solution, surface modification research was conducted to improve the dispersibility of each nanomaterial, and dispersibility before and after modification was evaluated depending on the solvent. To provide optimal functionality, coating solutions based on various nanomaterials such as nanoclay, graphene, carbon nanotube, graphene nanoplate, silver nano, nanodiamond, and cellulose nanofibril were prepared, and dispersion and coating performance were evaluated. .

<Manufacture of functional coating solution according to nanoparticle content (MMT)>

<Manufacture of functional coating solution according to nanoparticle content (Ag)>

<Manufacture of functional coating solution according to nanoparticle content (ND)>

<Manufacture of functional coating solution according to nanoparticle content (GNP)>

<Manufacture of functional coating solution according to nanoparticle content (GO)>

<Manufacture of functional coating solution according to nanoparticle content (CNT)>

<Confirmation of nanocomposite fabric properties according to coating conditions and evaluation of optimal conditions>

Coating was performed by adjusting the coating process variables (viscosity/application amount), and optimal coating conditions were confirmed through evaluation of physical properties according to conditions.

Coating was carried out under conditions of 2.0 ~ 3.0 Pa.s, which is the viscosity range for thin film coating, and physical properties were compared according to viscosity under the same application amount conditions.

It was confirmed that the same application amount showed excellent tensile strength in the MD direction under the viscosity condition of 2.0 Pa.s, and that the tensile strength decreased slightly in the TD direction. In addition, an increase in tear strength was confirmed, which is thought to be a result of the easy penetration of the coating liquid between fibers under the condition of 2.0 Pa.s.

Basically, it can be seen that the physical properties improve as the application amount increases. In order to confirm the optimal conditions for the type and concentration of the functional coating liquid, physical property evaluation was conducted according to the content of each nanofiller.

The filler content was compared at 1, 3, and 5 wt.%, respectively, and the viscosity condition (2 Pa.s) and application amount condition (5 g/m ² ) were fixed. Regardless of the type of nanofiller, there was no significant difference in physical properties depending on the content, but there was a difference in physical property behavior depending on the type of nanoparticle.

In the case of MMT and GO, the physical properties tended to improve the most, and this appears to be the result of the interaction between the coating solution and the fiber due to the functional groups of MMT and GO through modification.

In the case of ND, GNP, and CNT, the physical properties tended to improve slightly as the content increased up to 3 wt.%, but showed a tendency to decrease at 5 wt.%. This is a common behavior in nanocomposites and appears to be the result of a defect when more than a certain amount of nanofiller is included.

In the case of Ag, the physical properties tended to decrease as the content increased, which appears to be the result of a weak interaction between Ag particles and the coating solution, and also the result of spherical Ag particles causing slippage between polymer chains.

5) Evaluation of developed product properties and optimal conditions

Surface analysis using FE-SEM; FE-SEM analysis of the developed product was conducted to confirm the surface characteristics of rPP fabric according to dyeing and coating. General characteristics of PP fabrics, such as smooth surface and circular cross-section, can be confirmed in SEM images, and when comparing the SEM images of each sample, it was confirmed that the surface of the coated rPP fabric was penetrated with a coating solution.

It was confirmed that some of the coating liquid penetrated into the space between the fibers that make up the rPP fabric, and the properties of the nanocomposite fabric due to this phenomenon were confirmed through the tensile strength behavior before and after coating (Figure 8).

- Contact angle evaluation of composite fabrics (raw material/dyed sample/coated sample) according to dyeing and coating was conducted. Each was conducted in the front and back directions, and the contact angles for water and oil were measured and evaluated.

- It was confirmed that the contact angle on the front side was larger than the contact angle on the back side regardless of the presence or absence of dyeing and coating. This appears to be the result of surface differences during the weaving, dyeing, and coating processes.

- In addition, it was confirmed that the contact angle for water/oil was large on the front side of the coating sample, and this was confirmed to be the result of the water-repellent treatment of the developed product (Figures 9 and 10).

<Evaluation of physical properties of developed products>

- The tensile strengths of untreated rPP and coated rPP fabrics were measured and compared to confirm the physical behavior of the developed product before and after coating. All samples were measured in both the warp and weft directions, and each sample was measured 5 times (Figure 11).

- The tensile strength in the CD direction of the untreated rPP fabric and the coated rPP fabric was 55 MPa and 28 MPa, which means that the uncoated fiber strands of the coated fabric showed a stronger tensile strength than the untreated rPP fabric, which is due to the distance between fibers due to penetration of the coating solution. I think it was the result of what happened. On the other hand, the tensile strength in the MD direction was confirmed to have increased.

- It was thought that it would be possible to control the physical properties of the final product by adjusting process variables such as coating solution concentration and tension during the process.

- As a result of measuring the tear strength of rPP fabric, there was no significant difference between the untreated fabric and the coated fabric, but it was confirmed that the tensile-tear strength that decreased during the dyeing process was compensated.

3. Manufacturing of fabrics

1) Selection of fabric material and weaving Establishing conditions

Currently, most outdoor car cover products use high-strength polyester fabric. Since these products are used outdoors, high-strength fabric is mainly used to minimize tearing or scratching. Currently, existing products are general polyester DTY fabrics that do not contain graphene and mainly have an Oxford-type plain fabric structure. However, in the design of the Oxford thick woven fabric for Rubicon and truck covers, a car cover fabric was designed using PP Graphene 20S' yarn produced by Soltech Co., Ltd. as the weft. Considering the product characteristics required by the basic market, it was designed as follows.

<1 type of woven fabric SPEC>

Since these products are used outdoors, high-strength fabrics are mainly used to minimize tearing or scratching. To build the P150d/72f warp yarn, approximately 250kg of PES75d/36f DTY SD yarn was purchased, two yarns were combined, and a 150d warp beam and sizing process were performed to produce the yarn.

100 kg of PP graphene 20'S spun yarn was prepared.

Starting with the design of the fabric, the following processes were carried out sequentially: warp preparation - warp beam production - sizing - diameter - loom machine - weaving, and approximately 2000y of raw material was prepared.

2) High-day light dye , UV absorber Establishment of selection and dyeing conditions: acromasa dye use

Development of three primary colors and gray dyes for PET - Types and characteristics of disperse dyes

The Azo series has a variety of colors, has excellent color strength (2 to 4 times that of the Anthra Quinone series), has excellent wetting and sublimation fastness, and is economical, while Dull Color is easily decomposed by sunlight and some dyes have limited pH. While the Anthra Quinone series has bright colors (yellow, blue, red), excellent light fastness, excellent leveling ability, and excellent dyeing reproducibility, it has the disadvantage of being inferior in week color strength and wet fastness (especially to Nylon).

3) Daylight 3 primary color dye settings

After testing under three primary colors of sunlight (63℃

4) Color or formulation development

Tests were conducted for development by varying the formulation ratio of each dye, and the optimal gray formulation was established by deriving a formulation using item 8, which is the most optimized formulation ratio.

Ratio of each dye for optimal Gray formulation

5) Establishment of optimal dyeing conditions and dyeing ability for improvement dyeing curve correction

Development of optimal dyeing process

6) Through dyeing process development dyeing ability Improvement (temperature rises by 10 degrees)

○ Establishment of dyeing conditions for PP yarn incorporating graphene

7) Optimal reduction cleaning (R/C) improvement

In the past, it was washed in NaOH+Hydro solution at 80℃ for 10 minutes, but after washing, the unfixed disperse dye was not easily removed and remained on the surface of the fabric, resulting in a decrease in fastness. In order to prevent this decrease in fastness as much as possible, the reduction cleaning process was improved.

After washing with NaOH+MSA solution at 80°C for 20 minutes, it was confirmed that much more unfixed disperse dye was removed than with the existing method.

8) For car cover Selection and development of ultraviolet absorbers

We analyzed three types of currently commercialized UV-absorbers and selected the product with the highest UV absorption rate in the UV B region.

Optimal UV-absorber

- Select absorbent for area B

9) For mass production lap dip and dyeing process progress

- S-Type high-daylight dye selection and recipe

In our research and development, we decided to proceed using gray color dye and recipe, which had the highest sales volume.

The key is to set the UV absorber Dorafast ST-New concentration to 3% and add it along with the dye when dyeing. For stable dyeing and high sunlight fastness, the temperature increase rate of the dyeing temperature rise curve (2 degrees/min), optimal dyeing temperature (135 degrees) and time ( 60 minutes) and using the recipe determined through experimentation, a lab dip was carried out for dyeing for mass production at Garden I&C, and gray color was dyed. We wanted to proceed with the dyeing process by selecting the most appropriate color out of 4 to 5 options for each color. Based on these colors, dyeing, water-repellent, oil-repellent, insect-repellent, anti-bacterial, and sire processing were sequentially performed to produce fabric for prototype production. .

10) Eco-friendly water repellent oil repellent Eco-friendly by mixing Water and oil repellent Development and processing

First, tests were conducted using different mixing ratios of water and oil repellent. For the water repellent, a C6 type product purchased through ADC Korea was used, and for the oil repellent, a nanoparticle-dispersed silane oil repellent purchased from Spon Korea was used.

All tests were conducted with the same conditions except for mixing ratio and milling time. After immersing the fabric in the mixed solution for 5 minutes, the treatment was completed by applying pressure using a laboratory padding machine and drying at 200°C for 3 minutes. The initial water and oil repellency of the water/oil repellent treated fabric was measured, and the water and oil repellency after 5 washes were measured. did.

In the case of initial water repellency, initial oil repellency, and oil repellency after 5 washes, consistent result values were obtained regardless of the mixing ratio, but there was a performance difference in water repellency after 5 washes.

As shown in the table above, among the five mixing ratio conditions, the condition with the best water repellent performance is the mixing ratio of 60 g/L of water repellent and 60 g/L of oil repellent, or the mixing ratio of 55 g/L of water repellent and 55 g/L of oil repellent. The conditions also showed excellent performance, and it was expected that further improved performance could be expected when a cross-linking agent was added.

Considering the amount of water and oil repellent used during mass production, the latter condition was judged to be more advantageous, so a second test was conducted by adding a crosslinking agent under the mixing ratio of 55 g/L of water repellent and 60 g/L of oil repellent.

Samples were prepared using mixed solutions with crosslinking agents added at each mixing ratio, and the initial water repellency, initial oil repellency, and oil repellency after washing 5 times were measured. Even if the amount of water repellent was slightly small, better results were obtained as the amount of oil repellent was increased. Excessive mixing of water and oil repellent increased the cost ratio.

The applicant confirms that this product can have the physical properties required for car cover fabric even if mass production is carried out with 55g/L of oil repellent and 60g/L of water repellent. The experimental data will be used in the development of other new products in the future, and there are some conditions for mass production. It was decided to change.

11) Establishment of nanoparticle dispersed silicon coating technology

In order to manufacture a coating solution for surface treatment, which is the most important factor in UV durability, setting the viscosity of the mixed resin solution that allows thin film coating on the surface of the fabric is an important factor.

Currently, in the case of silicone products with dispersed nano-silica colloidal particles, low concentration can be achieved with IPA (Iso-propyl Alcohol) Base, and the decision on how much IPA phr should be mixed to create a mixed coating solution of appropriate viscosity is a very important factor. am.

The viscosity of silicon, the medium for surface treatment coating, was fixed at 2,000 to 3,000 cp to ensure workability.

For coating thin films of 1 to 3 microns or less, it is important to set the line speed to 30 to 40 m/min, the thickness of the knife is less than 0.5 mm, and a viscosity of about 2,000 to 3,000 cps is appropriate, which can be used in various preliminary experiments. It has already been verified through .

Therefore, the appropriate standard for IPA content based on 50 phr of nanoparticle dispersed silicon is that when mixed at 50 phr, a viscosity of about 2,320 cps can be obtained.

Based on these results, we prepared a mixed resin coating solution to enable mixing conditions of 50 phr IPA based on 50 phr nanoparticle dispersed silicon as shown below.

The type of nanoparticle dispersed silicone used was a mixture of Drytreat's 40SK alcohol dispersion silicone product and Spon Korea's STP-18 nanoparticle colloidal dispersion product. These two products were diluted through nanocolloid dispersion and condensation reaction. This product is resistant to ultraviolet rays, increases the hydrophobicity of the product, has excellent bonding power, and does not cause scratches or discoloration of the car surface.

In the case of the expected nanocolloid solid content (%), it is the solid content contained inside the surface coating agent after the alcohol is removed during coating after each formulation, and indicates how much nanocolloid particles are dispersed on the surface, which is related to cost aspects and functions. This is an important factor to consider.

* Backside coating process technology

To investigate the appropriate add on of the back coating layer, the following results were derived.

If the actual coating is added too finely, the oil repellency after washing is maintained at grade 4 or higher, but the water repellency shows a low value due to loss of durability after washing. This is because the coating layer does not support the surface water-repellent and oil-repellent layer. Since durability may deteriorate after use, an appropriate coating agent must penetrate into the fabric to support the water-repellent and oil-repellent layer. At this time, it is recommended to maintain air permeability above 10 for penetration, where air permeability in the pre-coating stage plays an important role. In particular, high air permeability means that the voids between the fabrics are large, making it easy for coatings to penetrate. However, if a large amount of coating agent is added due to an air permeability layer that is too large, the fabric tends to become hard. It was judged to be sufficient.

In the case of air permeability after coating, it is appropriate to control it to 5 or less to increase the water pressure. It is better to select a product with high moisture permeability below 5, but the water pressure must be taken into consideration.

Therefore, analyzing the data set for high durability water repellency shows that air permeability and moisture permeability decrease rapidly when the coating add on is above 5gsm, and water repellency is significantly strengthened.

Using these results, a coating with high moisture permeability and water resistance of about 4g~5g/sqm, which requires a water resistance of 2000mmH ₂ O, which is enough for an actual car cover fabric to block everyday rain, was used with the following recipe and experimental conditions. proceeded with.

- Line Speed: 30~40m/min and Knife is 0.5mm work. The work was carried out after randomly practicing several times to increase the speed to about 4~5g/gsm when coating the surface of the final product.

- Temp & Residual time: The chamber temperature and residual time conditions for alcohol rarefaction speed and complete curing are 120 degrees Celsius for 60 seconds to prevent the PP weft from hardening the fabric at high temperatures.

- In the case of water-dispersed nanoparticle-dispersed silicon, curing conditions of approximately 40 seconds at 150℃ or higher are required, so the temperature inside the pilot chamber was set at 120℃ for approximately 2 minutes to extend the curing time.

12) Production of mass production coating samples

The mass production conditions were conducted by connecting with a gray colored oval fabric prepared under the same conditions as the existing pilot test method. However, since the coating line was short at about 20m, the residual alcohol drying process was reproduced using a secondary tentering machine.

Claims (7)

Spinning PP yarn and composite yarn containing graphene content of 0.005 wt.%, ~0.1 wt%;
Spinning recycled PP yarn and composite yarn incorporating the graphene;
Dyeing and UV coating the fabric with a high sunlight dye,
Processing an eco-friendly water and oil repellent agent;
Coating the fabric with a nano-coating solution for surface treatment containing one or more of nanoclay, graphene, carbon nanotubes, graphene nanoplates, silver nano, nanodiamonds, and cellulose nanofibrils; and
A step of back coating with a back coating agent;
A method of manufacturing a functional fabric comprising. The manufacturing method according to claim 1, wherein in the spinning step, drying is performed at 50 to 150°C, the spinning temperature is 250°C to 260°C, and the cutting length is 40 mm (±2). The manufacturing method according to claim 1, characterized in that spinning is performed using the Ring Compact method. The manufacturing method according to claim 1, wherein in the dyeing step, the dyeing step is washed with NaOH+MSA solution at 80°C for 20 minutes. The manufacturing method according to claim 1, wherein a UV absorber is added together with the dye during the dyeing, and the dyeing temperature rise curve for stable dyeing and high sunlight fastness is treated at a temperature increase rate (2 degrees/min) at 135° C. for 60 minutes. method. The manufacturing method according to claim 1, wherein the air permeability when coating the back side is at least 5 and at most 50 or less. A functional fabric incorporating graphene prepared according to any one of claims 1 to 6.