KR101356050B1 - A solvent type polyurethane composition for seam sealing tape, a method of preparing a polyurethane film by using the same, and seam sealing tape comprising the polyurethane film - Google Patents

Abstract

The present invention is a solvent-type polyurethane composition for a sealing tape comprising a low viscosity polyurethane having a viscosity of 5000 to 8000 cps, a high viscosity polyurethane having a viscosity of 80000 to 100000 cps, a crosslinking agent, and a solvent, a method for producing a polyurethane film using the same, And it relates to a sealing tape comprising a polyurethane film prepared therefrom.

Solvent-type polyurethane composition for heat-sealing tape of the present invention is capable of expressing a variety of colors through the addition of a pigment, the polyurethane film produced therefrom may exhibit properties comparable to that of conventional thermoplastic polyurethane.

Solvent type, polyurethane, heat sealing, tape,

Description

A solvent-type polyurethane composition for sealing tape, a method for producing a polyurethane film using the same, and a sealing tape comprising a polyurethane film produced therefrom. FILM BY USING THE SAME, AND SEAM SEALING TAPE COMPRISING THE POLYURETHANE FILM}

The present invention can produce a wexling tape having the same level of physical properties as thermoplastic polyurethane, a solvent-type polyurethane composition for a weft sealing tape excellent in color expression characteristics through the combination of various dyes, the production of a polyurethane film using the same The present invention relates to a sealing tape comprising a polyurethane film prepared therefrom.

A moisture-permeable tarpaulin is a fabric that does not allow water to pass while passing water vapor, and is widely used as a sports leisure clothing. When the garment is manufactured using such a moisture-permeable tarpaulin, the suture must be made. At this time, water can penetrate into a small hole formed by the suture, and the suture acts as a cause of deteriorating the function of the moisture-permeable waterproof garment.

The sealing tape is used as a tape to close the seam to prevent the opening caused by such sutures.

In recent years, functional clothing, including moisture-permeable waterproof clothing, has become generally lighter in weight, and clothing manufacturers have used three-layer or various two-sided textile materials in which the appearance of the seam sealing tape is conveyed to consumers. I choose. Therefore, the development of the 씸 sealing tape having a color similar to the back of the clothing and the same configuration is in progress.

The sealing tape is composed of a base film layer and an adhesive layer, and the production of the base film layer is generally manufactured using a thermoplastic polyurethane (TPU).

The production of the base film layer using the TPU is useful for the production of transparent or colorless sealing tape, which is generally used because the equipment itself is suitable for mass production.

However, in the production method using the TPU, in order to change the color of the tape, it is necessary to remove all the TPU remaining in the facility, wash the facility, and manufacture a new color film again. It had limitations that were undesirable for making films.

As a means to replace this, some companies are attempting to manufacture multi-color heat-sealing tape using solvent-type polyurethane (Solvent polyurethane, Solvent PU).

The production of heat-sealing tapes using solvent-based PU makes it easy to manufacture films without the use of large equipment, and can work in small quantities. However, the base film layer manufactured by using a conventional Solvent PU has a limitation in that the mechanical properties are poor compared to the base film layer manufactured by using a TPU, and the heat-sealing tape produced by Solvent PU has a water resistance characteristic. I have a problem.

Disclosure of Invention An object of the present invention is to provide a solvent-type polyurethane composition for a heat sealing tape having mechanical properties comparable to that of a TPU and capable of implementing various colors.

Another object of the present invention is to provide a method for producing a polyurethane film using the solvent-type polyurethane composition.

Still another object of the present invention is to provide a sealing tape comprising a polyurethane film prepared from the composition.

In order to achieve the above object, the present invention provides a solvent-based polyurethane composition for a sealing tape comprising a low viscosity polyurethane having a viscosity of 5000 to 8000 cps, a high viscosity polyurethane having a viscosity of 80000 to 100000 cps, a crosslinking agent, and a solvent. .

The present invention also comprises the steps of applying the polyurethane composition in the form of a film; And it provides a method for producing a polyurethane film comprising the step of proceeding the cross-linking reaction by curing the applied film at 140 to 160 ℃.

The present invention also provides a polyurethane film prepared according to the above method, the polyurethane film comprising the low viscosity polyurethane and the high viscosity polyurethane crosslinked by the crosslinking agent; And it provides a 씸 sealing tape comprising an adhesive layer formed on one surface of the polyurethane film.

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

Polyurethane composition of the present invention is to produce a polyurethane film having a variety of colors and excellent mechanical properties, low viscosity polyurethane having a viscosity of 5000 to 8000 cps, high viscosity polyurethane having a viscosity of 80000 to 100000 cps, crosslinking agent , And solvents.

In this case, the weight ratio of the low viscosity polyurethane and the high viscosity polyurethane may be 6: 4 to 9: 1, preferably 8: 2 to 9: 1 for transparency and tensile and elongation characteristics of the film. When the ratio of low viscosity polyurethane is lowered, the strength decreases and the film becomes opaque. On the contrary, when the ratio of high viscosity pulley polyurethane is lowered, the film becomes too hard to be used as a tape.

In addition, when the total amount of each component in the composition is 100% by weight, the total resin content of the low viscosity polyurethane and the high viscosity polyurethane is 50 to 80% by weight, in terms of film formability and formulation stability of the composition, It is more preferable that it is 60 to 70% by weight, the content of the crosslinking agent is preferable in terms of increasing the elongation and initial modulus of the film required to be 1 to 10% by weight, more preferably 3 to 5% by weight, The remaining amount of solvent may be included.

The low-viscosity polyurethane is a low-viscosity polyester polyurethane resin, which itself can form a film of a relatively hard feeling, preferably polyester polyol, methylene bis [phenyl isocyanate] (MDI), and Polyester polyurethane made from toluene diisocyanate (TDI).

In addition, the high viscosity polyurethane is a high viscosity polyester polyurethane resin, which can itself form a relatively soft and rubbery film, preferably polyester polyol, and methylene bis [phenyl isocyanate] (MDI It may be a polyester polyurethane prepared from). At this time, the type of the polyester polyol is not particularly limited, but in the case of the low viscosity polyurethane, the polyester polyol is a repeating unit derived from a polyester polyol and 1,4-butanediol in the form of adipic acid ester It is preferable to include in terms of physical properties, and in the case of the high-viscosity polyurethane, it is preferable to include repeating units derived from polyol, 1,4-butanediol, and ethylene glycol in the form of adipic acid ester.

In addition, the crosslinking agent included in the composition is preferably a reactant of a polyfunctional polyol and a diisocyanate compound, and 1,1,1-trimethylol propane (TMP) and toluene diisocyanate (TDI) More preferably a reactant.

The solvent-type polyurethane composition for heat sealing tape may be used as such, but may further include a required color among various known inks, pigments, or pigments in order to create high value through expression of various colors. .

Examples of the ink, dye, or pigment that can be used in the polyurethane composition include one or more selected from the group consisting of 7DS-WHITE, 9DS-D / GREY, and 6DS-BEIGE, but are not necessarily limited thereto.

The solvent included in the polyurethane composition of the present invention may be used without particular limitation as long as it is compatible with the polyester polyurethane and the crosslinking agent. Preferably, dimethylformamide, methyl ethyl ketone, xylene, toluene, methyl iso 1 type selected from the group consisting of butyl ketone, acetone, ethyl acetate, dioxane, tetrahydrofuran, cyclohexanone, cyclohexanol, ethyl alcohol, methyl alcohol, isobutanol, methyl cellosolve, and butyl cellosolve It may be a solvent.

The composition is applied in the form of a film; And a curing process of the applied film at 90 to 110 ° C. to perform a crosslinking reaction. The polyurethane film may be prepared as a polyurethane film, and the polyurethane film may be used as a base film layer of a sealing tape. Can be.

In particular, the polyurethane film is to advance the crosslinking reaction by drying and heat-treating the polyurethane composition, and includes the low viscosity polyurethane and the high viscosity polyurethane crosslinked by the crosslinking agent.

As shown in Figure 1, the heat-sealing tape of the present invention is composed of a base film layer and an adhesive layer, wherein the base film layer is characterized in that the polyurethane film layer prepared using a solvent-based polyurethane composition.

Since the adhesive layer of the texiling tape may be a conventional texiling tape adhesive, it is not particularly limited in the present invention.

Solvent-type polyurethane composition for heat-sealing tape of the present invention is capable of expressing a variety of colors through the addition of a pigment, the polyurethane film produced therefrom may exhibit properties comparable to conventional thermoplastic polyurethane.

Hereinafter, preferred embodiments of the present invention will be described. However, the following examples are only a preferred embodiment of the present invention, and the present invention is not limited by the following examples.

[Example]

<Raw material>

1) Low Viscosity Polyurethane: LU123 (Mesh Efficient, Viscosity 8000 cps), a polymer made from AA / 1,4-butanediol type polyester polyol, MDI, and TDI

2) High Viscosity Polyurethane: Polymer made from AA / 1,4-butanediol / ethylene glycol type polyester polyol, and MDI, UB820 (Make Effort, viscosity 80000 cps):

3) Crosslinking agent: reactant of trimethylolpropane / TDI (MS-CLA)

4) Pigment: 7DS-WHITE, 9DS-D / GREY, 6DS-BEIGE

However, the solvent used in the manufacture of urethane is included as it is.

Example 1

80 g of the low-viscosity polyurethane, 20 g of the high-viscosity polyurethane, 3 g of the crosslinking agent, and 0.3 g of the dye were mixed and stirred to obtain a uniform state to prepare a solvent-type polyurethane composition for sealing tape.

Example 2

85 g of the low-viscosity polyurethane, 15 g of the high-viscosity polyurethane, 3 g of the crosslinking agent, and 0.3 g of the dye were mixed and stirred to obtain a uniform state to prepare a solvent-type polyurethane composition for sealing tape.

Example 3

90 g of the low-viscosity polyurethane, 10 g of the high-viscosity polyurethane, 3 g of the crosslinking agent, and 0.3 g of the dye were mixed and stirred to obtain a uniform state to prepare a solvent-type polyurethane composition for sealing tape.

Examples 4 to 6

The composition prepared according to Examples 1 to 3 using a knife coater was applied onto a release film, respectively, to form a film, and dried at a temperature of 140 ° C. for 3-5 minutes to prepare a polyurethane film.

One side of the polyurethane film was coated with an adhesive (PU type, Shinshingi) and dried to prepare a sealing tape.

Comparative Example 1

A woven sealing tape made from conventional TPU (Admel, FU700 White) was used.

Comparative Example 2 (250PU)

A non-crosslinking agent was used, and the remaining sealing tape was prepared in the same manner as in Examples 4 to 6 using the same solvent-type polyurethane composition as in Example 1.

Comparative Example 3 (1900NY)

After synthesizing a copolymer using the components of the above-mentioned low viscosity and high viscosity polyurethane, it was mixed with a crosslinking agent, and the texiling tape was prepared in the same manner as in Examples 4 to 6.

Physical properties of the 씸 sealing tape prepared according to Examples 4 to 6 and the 씸 sealing tape according to Comparative Examples 1 to 3 were measured based on the following criteria.

* Shape of film: The cross sections of the heat-sealing tapes according to Examples 4 to 6 and Comparative Examples 1 to 3 were observed using a scanning electron microscope (SEM), and the cross-sectional photographs are shown in FIGS. 2 to 7.

* Tensile strength and elongation measurement: The sample sealing tapes according to Examples 4 to 6 and Comparative Examples 1 to 3 were prepared as samples having a size of 22 mm x 200 mm, and a tensile speed of 75 mm / min. Tensile strength and elongation were measured to summarize the results in Table 1 below.

* Water pressure measurement: Using the heat sealing tapes according to Examples 4 to 6 and Comparative Examples 1 to 3, heat sealing was performed on the seam portion of the garment sewn, and mainly considering the weakness of the heat sealing tape is the cross heat sealing portion. After preparing as shown in Figure 8 and cross-sealing, the water pressure was measured.

Water pressure measurement was recorded in accordance with the low water pressure method (KS K 0591; water resistance test of the fabric) when the water pressure when three droplets are generated, respectively, the results are summarized in Table 1 below.

[Table 1]

The tensile strength
(N) Elongation
(%) Water pressure
(mmH ₂ O) Example 4 54.4 273.6 3010-6200 Example 5 63.5 274 10800 ~ 11433 Example 6 55.9 205 1680 ~ 7220 Comparative Example 1 25.1 261 8580 ~ 11047 Comparative Example 2 23.4 157 2807 ~ 6693 Comparative Example 3 20.4 195.9 3277 ~ 6330

Looking at the results measured by the method, as shown in Figures 2 to 5, the sealing tape according to Examples 4 to 6 it can be confirmed that the cross section is very dense and hard, the sealing tape according to Comparative Example 1 It can be seen that the surface of the film is smooth and hard, and there is almost no elasticity. The adhesive surface has bubbles so that the surface is not smooth.

In addition, as shown in Figures 6 and 7, the surface of the polyurethane film prepared according to Comparative Example 2 is seen a lot of bubbles, the surface of the polyurethane film prepared according to Comparative Example 4 has an opaque and sticky feeling, bubbles Many things can be observed with the naked eye.

In addition, as shown in Table 1, the heat-sealing tape of the present invention has a high strength and elongation, it can be seen that the excellent water resistance characteristics.

Solvent type polyurethane composition for heat-sealing tape of the present invention is to enable the small-scale production of multi-type of heat-sealing tape, which can greatly contribute to the fashion of functional clothing, it is large to secure the competitiveness of small and medium companies difficult to secure large-scale production equipment It is expected to play a role.

1 is a cross-sectional view showing the structure of a heat sealing tape.

2 to 7 are scanning electron microscope (SEM) photographs showing cross sections of the heat sealing tapes according to Examples 4 to 6 and Comparative Examples 1 to 3, respectively.

8 is a plan view showing an example of cross shock sealing when measuring the water pressure resistance

Claims (8)

Low viscosity polyurethanes having a viscosity of 5000 to 8000 cps, High viscosity polyurethanes having a viscosity of 80000 to 100000 cps, Crosslinking agents, and solvent Solvent type polyurethane composition for heat sealing tape comprising a. The method of claim 1, A solvent-type polyurethane composition for a sealing tape having a weight ratio of the low viscosity polyurethane and the high viscosity polyurethane is 6: 4 to 9: 1. The method of claim 1, The sum total of each said component is 100 weight%, The total content of the low viscosity polyurethane and high viscosity polyurethane is 50 to 80% by weight, The content of the crosslinking agent is 1 to 10% by weight Solvent-type polyurethane composition for sealing tape. The method of claim 1, The low viscosity polyurethane is a polyester polyurethane prepared from polyester polyol, methylene bisphenyl diisocyanate (MDI), and toluene diisocyanate (TDI), The high viscosity polyurethanes are polyester polyols and polyester polyurethanes made from methylene bisphenyl diisocyanate (MDI) Solvent-type polyurethane composition for sealing tape. 5. The method of claim 4, The polyester polyol of the low viscosity polyurethane includes a polyester polyol in the form of adipic acid ester , and repeating units derived from 1,4-butanediol, The polyester polyol of the high viscosity polyurethane comprises a repeating unit derived from polyester polyol , 1,4-butanediol, and ethylene glycol in the form of adipic acid ester Solvent-type polyurethane composition for sealing tape. The method of claim 1, The crosslinking agent is a solvent-type polyurethane composition for a sealing tape, which is a reaction product of a trifunctional polyol and toluene diisocyanate (TDI). Applying the composition according to any one of claims 1 to 6 in the form of a film; And Curing the applied film at 140 to 160 ° C. to proceed with the crosslinking reaction. Method for producing a polyurethane film comprising a. A polyurethane film prepared from the composition according to any one of claims 1 to 6 and comprising the low viscosity polyurethane and the high viscosity polyurethane crosslinked by the crosslinking agent; And Adhesive layer formed on one surface of the polyurethane film A sealing tape comprising a.

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