KR100530570B1 - Release label for wet laminating, method for manufacturing the same, and method for manufacturing laminated moisture-permeable waterproof cloth using the same. - Google Patents

Abstract

The present invention relates to a release foam for wet laminating, a method for producing the same, and a method for producing a laminated moisture-permeable waterproof cloth using the same.

(i) padding the polyamide or polyester TAFFETA fabric with a water repellent solution and squeezing at a pick-up rate of at least 70%, and (ii) tentering at 150-170 캜 for 10-50 seconds. And (iii) subsequently performing a CIRE process twice or more at a pressure of 3 to 4 Kg / cm 2 at 130 ° C to 150 ° C to prepare a release laminating paper for wet lamination having the following physical properties.

-Below-

ㅇ Surface roughness (smoothness): 100nm or less

ㅇ Friction coefficient (slip): 0.1 ~ 0.5

ㅇ Morphological stability (shrinkage direction in the weft direction to organic solvent, water and heat): 3% or less

In addition, the present invention forms a wet porous polyurethane film on the release foam and then combines it with a fabric coated with an adhesive (dot) and then release the release paper to produce a laminated moisture-permeable waterproof cloth.

Description

Release laminating paper for wet laminating, a manufacturing method thereof and a manufacturing method of a laminated moisture-permeable waterproof cloth using the same.

The present invention relates to a release paper used as a release paper in the production of laminated moisture-permeable waterproof cloth and a method for producing the same.

The present invention also relates to a method of manufacturing a laminated moisture-permeable waterproof cloth using the release foam paper.

Conventional moisture permeable tarpaulin was prepared by directly applying a resin on a fabric by a floating knife or a knife over roll method to solidify the film by a dry or wet process and to express micropores.

The moisture-permeable tarpaulin by the direct coating method is hard to touch as the resin penetrates into the fabric layer, the moisture permeability is lowered, and when coated on a low-density fabric, the resin is leached onto the back of the fabric, and a highly elastic fabric having low form stability such as knitting. In the case of having a uniform coating layer over the entire width was not possible due to the coating trick.

In order to solve the problems caused by the direct coating as described above, and to maintain the physical properties such as water pressure and moisture permeability uniformly, the resin is cast on a release paper to form a film layer, and the film layer and the fabric are bonded and combined, and then the release paper The method of manufacturing the laminated moisture-permeable tarp by peeling off was developed.

However, until now, a hydrophilic non-porous film or a polytetrafluoroethylene (PTEF) film has been used as a film to be adhered to and combined with a fabric. When hydrophilic non-porous film is used, the water pressure is excellent but moisture permeability is lowered. Polytetrafluoroethylene (PTEF) film requires expensive facilities for casting, and it is technically difficult. It is produced exclusively by Gore.

In addition, the prior art also has a problem that the release paper is not easily peeled off from the laminated laminate moisture-permeable waterproof cloth, such as the touch of the moisture-permeable waterproof cloth is lowered.

The present invention is to provide a release foam and easy to peel from the moisture-permeable waterproof cloth and excellent shape stability and a method of manufacturing the same. In addition, the present invention is to provide a method for producing a laminated moisture-permeable waterproof cloth having excellent moisture permeability and water pressure at the same time, good durability, tactile and peeling strength without using expensive manufacturing equipment.

The present invention relates to a release paper for producing a moisture-permeable waterproof cloth excellent in smoothness, slip properties and form stability, and a manufacturing method thereof. In addition, the present invention relates to a method of manufacturing a laminated moisture-permeable waterproof cloth having excellent moisture permeability and water pressure resistance using the release foam paper, and improved touch, durability and peel strength.

The present invention is characterized in that water-repellent and CIRE-processed polyamide or polyester TAFFETA fabric is produced in the production of release foam. In another aspect, the present invention is characterized in that the wet porous film formed on the release paper is made of a polyester-based polyurethane resin, and the adhesive is applied to the fabric in a dot (dot) state with an embossing roll.

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

First, release foam is manufactured through the following process.

(i) padding the polyamide or polyester TAFFETA fabric with a water repellent solution and squeezing at a pick-up rate of at least 70%, and (ii) tentering at 150-170 캜 for 10-50 seconds. (Iii) Subsequently, the CIRE is processed two times or more at a pressure of 3 to 4 Kg / dl at 130 ° C to 150 ° C.

At this time, it is preferable to use the composition of the water repellent solution in which 1-10 g of silicone-based or fluorocarbon-based super water-repellent (solid content of 15 to 30%) is dissolved per liter of water. In order to ensure that the release paper has the desired surface roughness (smoothness), coefficient of friction (slip), and shape stability (shrinkage in the weft direction to organic solvents, water and heat), single filament (monofilament) fineness consists of multifilaments with l denier or less. It is preferable to use polyamide or polyester tarpaulin fabric having a warp yarn total density of 190 to 300 pieces per inch.

The release forge thus prepared has the following physical properties

-Below-

ㅇ Surface roughness (smoothness): 100nm or less

ㅇ Friction coefficient (slip): 0.1 ~ 0.5

ㅇ Morphological stability (shrinkage direction in the weft direction to organic solvent, water and heat): 3% or less

It is more preferable that the surface roughness (smoothness) of the release paper is 10 nm or less.

The release forge of the present invention is composed of a multifilament having a single yarn fineness of 1 denier or less, and is particularly excellent in smoothness and slipperiness due to a water repellent and a sire process.

Next, a wet porous polyurethane film having a relatively uniform form of pores is formed on the release paper by the following process.

(i) coating the polyurethane resin composition containing no crosslinking agent on the release paper with a knifeover roll coating method so as to have a thickness of 15 to 40 μm after drying;

(ii) coagulate for several minutes in a wet coagulation bath which is an aqueous solution of dimethylformaldehyde,

(iii) after washing at least twice in the washing tank;

(iv) tenter at 140-150 degreeC.

At this time, it is preferable not to add a crosslinking agent to the polyurethane resin composition coated on the release foam in order to facilitate peeling with the release foam, and it is preferable to use a polyester-based polyurethane resin.

It is preferable that the said polyurethane resin composition has the following composition components and composition ratio.

-Polyurethane Resin Composition for Porous Film-

ㅇ Polyurethane resin (polyester): 44 ~ 70.5 wt%

ㅇ Dimethylformaldehyde: 20 ~ 35 weight%

ㅇ Silica: 0.5∼2.0 weight%

ㅇ Nonionic surfactant: 3 ~ 6 wt%

ㅇ Anionic surfactant: 2 ~ 5 wt%

ㅇ White pigment: 3 ~ 6 wt%

ㅇ Water repellent (fluorocarbon): 1-2 wt%

It is preferable that the concentration of dimethylformaldehyde in the aqueous dimethylformaldehyde solution used for wet coagulation is 10 to 30%, and the temperature of the wet coagulation bath is 10 to 30 ° C.

On the other hand, a polyurethane adhesive (binder) having a viscosity of 20 to 30 poise is applied in the form of a dot with an embossing roll on a stretchable fabric or knitted fabric.

The application of the adhesive in the form of dots here means that the adhesive is not applied to the entire surface of the fabric or knit fabric, but only to the partial surface. In other words, the adhesive on the concave portion of the embossing roll is applied to some surface of the fabric or knitted fabric. At this time, it is preferable to use an embossing roll of 30 to 50 mesh. In addition, it is preferable to use a polyurethane adhesive solution having the following composition as the binder.

Polyurethane Adhesive Solution Composition

ㅇ Polyurethane adhesive: 48 ~ 69 weight%

ㅇ Toluene: 15-25 wt%

ㅇ Diisocyanate (crosslinking agent): 1-2 wt%

ㅇ Dimethyl formaldehyde: 15 ~ 25 wt%

The wet polyurethane porous film formed on the release foam by the method described above and the adhesive (dot or fabric) coated with a fabric (fabric or knitted fabric) coated in a dot (dot) and then peeled off the release paper to produce a laminated moisture-permeable tarpaulin.

The moisture-permeable tarp prepared as described above is soft in touch and excellent in peel strength and washing durability. In addition, the water pressure level is 3,000 to 5,000 mmH ₂ O and the water vapor transmission rate is 6,000 to 9,500 g / m 2 · 24 hours.

In the present invention, the method of measuring the moisture permeability, water pressure, surface roughness and coefficient of friction is as follows.

ㅇ Surface roughness measurement

The average roughness of the center line is measured by dividing the sample by 50 mm2 using a non-contact three-dimensional surface roughness meter. (Used equipment: product of WYKO company-RST plus model)

ㅇ Friction coefficient measurement

Using the Hidon-14-D surface surface tester of Shindong Science Co., Ltd., Japan, the static friction coefficient and the dynamic friction coefficient (μk) of the release forge were measured, and then the measured values were Substitute the food to find the coefficient of friction.

ㅇ breathability

It is measured by JIS L 1099 method.

ㅇ Water pressure

It is measured by JIS L 1096 method.

ㅇ Shape stability (shrinkage in the direction of the weft)

In the presence of an organic solvent (dimethylformaldehyde), water of 150 ° C. or higher and heat of 150 ° C. or higher, the shrinkage in the warp yarn direction is measured.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples. However, the present invention is not limited only to the following examples.

Example 1

Water repellent solution that is woven using polyamide multifilament with single yarn fineness of 0.8 denier as theodolite, and dissolves 5 g of silicone-based super water repellent (20% solids) per liter of water from a Tafuda fabric having a total density of 200 tons / inch. After padding on, squeezing at a pickup rate of 75%, tentering it at 20O < 0 > C for 160 seconds, and then performing three cycles of CIRE at 140 Kg / cm < 2 > Manufacture. The results of measuring the physical properties of the prepared release paper are shown in Table 1.

Example 2

A water repellent solution that is woven using a polyamide multifilament with a single yarn fineness of 0.9 denier as a theodolite, and dissolves 8 g of a silicone-based super water-repellent agent (20% solids) per liter of water using a Tafuda fabric having a total density of 280 bones / inch. After padding on, squeezing at a pickup rate of 75%, tentering it for 40 seconds at 170 ° C., and then performing four cycles of CIRE at 140 Kg / cm 2 at 140 ° C. to release the release paper. Manufacture. The results of measuring the physical properties of the prepared release paper are shown in Table 1.

<Table 1> Physical property measurement result of release forge

Example 3

After coating the polyurethane resin composition of the foam (A) below to a thickness of 20 μm after drying by using a knife over roll coating method on the release foam prepared in Example 1, the wet type of 25 ℃ 10% dimethylformaldehyde aqueous solution It solidifies for 3 minutes in a coagulation tank, washes twice with a washing tank, and tenters at 140 degreeC, and forms a wet porous polyurethane film on a release paper.

On the other hand, a polyurethane adhesive of the following composition (B) having a viscosity of 25 poise was applied with a 40 mesh embossing roll on a stretchable fabric.

Next, the polyurethane film formed on the release paper and the adhesive-coated fabric is combined, and then the release paper is peeled to prepare a laminated moisture-permeable waterproof cloth. The results of measuring the physical properties of the prepared moisture-permeable waterproof cloth are shown in Table 2.

-Resin composition (A) for porous film-

ㅇ Polyurea resin (polyester): 44 ~ 70.5 wt%

ㅇ Dimethylformaldehyde: 20 ~ 35 weight%

ㅇ Silica: 0.5 ~ 2.0 wt%

ㅇ Nonionic surfactant: 3 ~ 6 wt%

ㅇ Anionic surfactant: 2 ~ 5 wt%

ㅇ White pigment: 3 ~ 6 wt%

ㅇ Water repellent (fluorocarbon): 1-2 wt%

Adhesive composition (B)

ㅇ Polyurethane adhesive: 48 ~ 69 weight%

ㅇ Toluene: 15-25 wt%

ㅇ Diisocyanate (crosslinking agent): 1-2 wt%

ㅇ Dimethyl formaldehyde: 15 ~ 25 wt%

Example 4

The same method as in Example 3 except that the surface roughness and the coefficient of friction of the release foam were changed to 10.0 nm and 0.1, respectively, and the coating thickness (thickness after drying) of the polyurethane resin composition on the release foam was changed to 40 µm. The laminated moisture-permeable tarp is manufactured on condition. The results of measuring the physical properties of the prepared moisture-permeable waterproof cloth are shown in Table 2.

Comparative Example 1

The same method and conditions as in Example 3 except that the surface roughness of the release foam was changed to 17.0 nm, the coefficient of friction was 0.8, and the coating thickness (thickness after drying) of the polyurethane resin composition on the release foam was changed to 60 µm, respectively. To prepare a laminated moisture permeable tarp. The results of measuring the physical properties of the prepared moisture-permeable waterproof cloth are shown in Table 2.

Comparative Example 2

The polyurethane resin composition having the same composition as in Example 3 was directly applied onto the fabric with a comma knife, and then dried in multiple stages to prepare a laminated moisture permeable tarpaulin.

〈Table 2〉 Measurement results of moisture permeable tarpaulin

Comparative Example 3

The same method as in Example 3 except that the surface roughness of the release foam was changed to 17.0 nm, the friction coefficient was 0.9, and the coating thickness (thickness after drying) of the polyurethane resin composition on the release foam was changed to 20 µm. As a result of manufacturing the laminated moisture-permeable waterproof cloth under the conditions, the wet porous film is ruptured when the release foam is peeled off by applying an excessive force without peeling the release foam from the wet porous film.

Since the release foam of the present invention has excellent smoothness and slip properties and does not add a crosslinking agent to the polyurethane composition for film production, the release foam can be easily peeled from the laminated moisture-permeable waterproof fabric.

In addition, since the release foam of the present invention has excellent morphological stability against organic solvents, water, and heat, durability and peel strength of the moisture-permeable waterproof fabric manufactured using the release foam are improved.

In addition, in the present invention, since the adhesive is applied on the fabric in a dot (dot) state, the touch of the moisture-permeable waterproof cloth is very excellent. In addition, in the present invention, since the wet porous film is manufactured with a polyester-based polyurethane resin and then blended with the fabric, the moisture permeability and the water pressure resistance are excellent at the same time.

Claims (5)

(i) Polyamide or polyester TAFFETA fabric is padded in a water-repellent solution in which 1-10 g of silicone-based or fluorocarbon-based water repellent agent (solid content 15-30%) is dissolved per liter of water, and then picked up at least 70% (Pick squeezing at a rate of (up), (ii) it is tentered at 150 ° C.-170 ° C. for 10-50 seconds, and (iii) subsequently at 130 ° C.-150 ° C. at a pressure of 3-4 Kg / cm 2 for at least two times. ) Process for producing a release laminating for wet laminating, characterized in that the processing. (i) 1 to 10 g of silicone- or fluorocarbon-based water-repellent agent (solid content 15-30%) is padded in a water-repellent solution in which water is dissolved and squeezed at a pick-up rate of 70% or more, and (ii) Polyamide or polyester tarpaulin (TAFFETA) which is tentered at 150 ° C. to 170 ° C. for 10 to 50 seconds and subsequently subjected to CLRE processing at 130 ° C. to 150 ° C. at a pressure of 3 to 4 kg / cm 2. ) Release laminating paper for wet laminating which consists of fabric and has the following physical properties. -Below- ㅇ Surface roughness (smoothness): 100nm or less ㅇ Friction coefficient (slip): 0.1 ~ 0.5 ㅇ Form stability (shrinkage direction in the weft direction to organic solvent, water and heat): 3% or less In preparing a wet porous polyurethane film by coating a polyurethane resin composition on a release paper, and then attaching it to a fabric or knitted fabric coated with an adhesive (binder), and then peeling off the release paper to produce a laminated wet porous moisture permeable tarpaulin, (I) Squeeze at a pick-up rate of 70% or more after padding into a water-repellent solution in which 1-10 g of silicone-based or fluorocarbon superhydrophobic (15-30% solids) solution is dissolved per liter of water. ii) Tenter it for 10 to 50 seconds at 150 ℃ ~ 170 ℃, (iii) and then at 130 ℃ ~ 150 ℃ two times more (CRE) process at a pressure of 3 ~ 4Kg / ㎠ and the surface roughness is less than 100nm Manufacture of laminated moisture-permeable tarpaulin, characterized in that the polyamide or polyester Tafuda (TAFFETA) fabric has a friction coefficient of 0.1 to 0.5 and morphological stability (3% or less in the weft direction to organic solvents, water and heat).Law. The method of manufacturing a laminated moisture-permeable tarpaulin according to claim 3, wherein the embossing roll is used to apply an adhesive (binder) to a fabric or knit fabric in a dot state. The method of manufacturing a laminated moisture-permeable tarpaulin according to claim 3, wherein a polyurethane resin solution having a viscosity of 20 to 30 poise is used as an adhesive.