WO2014204065A1

WO2014204065A1 - Method for manufacturing thermoplastic polyurethane hotmelt film and thermoplastic polyurethane hotmelt film manufactured by same method

Info

Publication number: WO2014204065A1
Application number: PCT/KR2013/010717
Authority: WO
Inventors: 박희대
Original assignee: Park Heedae
Priority date: 2013-06-20
Filing date: 2013-11-25
Publication date: 2014-12-24
Also published as: KR20140147631A

Abstract

The present invention presents: a method not only capable of manufacturing a TPU hotmelt film having a precise thickness and width, by withdrawal-guiding the TPU hotmelt film using a conveyer belt capable of minimizing mechanical tension, without using multiple guide rollers as in the prior art, but also capable of manufacturing a TPU hotmelt film without using a release paper (a release sheet in paper form, or a release film such as PP or PE), particularly by mixing a slip agent and an antistatic agent together with TPU during manufacturing of the TPU hotmelt film; a method for manufacturing a thermoplastic polyurethane hotmelt film which prevents the adhesive strength or physical properties of the TPU hotmelt film from deteriorating; and a thermoplastic polyurethane hotmelt film manufactured by the method.

Description

Method for producing thermoplastic polyurethane hot melt film and thermoplastic polyurethane hot melt film produced by the above method

The present invention relates to a method for manufacturing a thermoplastic polyurethane hot melt film, and more particularly, to prepare a TPU hot melt film by a T-dies method, without using a release paper or a release film, The present invention relates to a method of preparing an environmentally friendly thermoplastic polyurethane hotmelt film, as well as a thermoplastic polyurethane hotmelt film prepared by the above method.

Recently, as in many industries, much effort has been made to reduce manufacturing costs in the footwear industry. As part of this, attempts have been made to reduce or eliminate the sewing process, which requires a lot of manpower during the shoe manufacturing process, and some have actually been applied.

In this way, the sewing process, which takes up a large part of the manufacturing cost, is replaced with an adhesive process to increase the output per person, and reduce the process time by reducing the cost.

In addition, in the general bonding process, the adhesive is applied to the adherend using a liquid adhesive, and then the adherends are bonded to each other in a state in which a solvent or moisture is volatilized through drying. This has the advantage of reducing the process time and workforce than the sewing process, but it does not stop efforts here, and furthermore, instead of using the liquid adhesive, the hot press in the film state is used to finish the bonding process by hot press. New concepts of production technology have begun to be incorporated.

In the production of such a hot-melt film, specifically in the production of a thermoplastic polyurethane-based hot melt film (hereinafter referred to as "TPU hot-melt film"), a single film extrusion is a mechanical tension of the extrusion equipment, and In most cases, work was impossible due to adhesiveness. For this reason, the resin is extruded into T-dies, and then a release paper such as paper or a release film such as PP or PE (hereinafter referred to as "Release Paper") is introduced and the resin is applied thereon to cool it. And allowed to cure.

However, such TPU hot melt film is generally produced in combination with the release paper during production, and used after removing the release paper during the heat press process. The release paper generated here is mostly discarded, and the amount of the release paper is very large and has been pointed out as a disadvantage of the hot melt process. In particular, there is a problem that does not meet the recent trends such as resource saving or environmentally friendly process development.

In particular, a conventional TPU hot melt film is manufactured while passing through a plurality of cooling rollers and a plurality of guide rollers as shown in FIG. 1, specifically, a release paper (for example, a release paper in a paper form, a PP or PE form). When the release film passes through the cooling roller, the T-die solution for hot melt is extruded from the T-die, and the hot melt TPU solution is applied to the surface of the release paper while passing through the cooling roller, and then through a plurality of guide rollers. In the process of winding on the winder, a TPU hot melt film is produced.

However, the TPU hot melt film manufactured by the above method is generally manufactured to a thickness of 0.2 mm or less, which is a very thin thin film. In this case, the cooling rate is slow and is composed of a soft composition. Due to the mechanical tension of the plurality of cooling rollers and the plurality of guide rollers, there is a disadvantage in that it is impossible to produce a TPU hot melt film having a precise thickness and width.

[Preceding technical literature]

[Patent Documents]

[Patent 1] Registered Patent Publication No. 10-1075373 (Invention name: Reactive polyurethane urea hot melt adhesive. Publication date: October 24, 2011)

[Document 2] Registered Patent Publication No. 10-0865692 (Invention name: Hot-melt film and its manufacturing method. Date: October 28, 2008)

[Patent Document 3] Publication No. 10-2002-0033869 (Invention name: hot melt adhesive film using YV resin. Publication date: May 08, 2002)

[Patent 4] Publication No. 10-2006-0126674 (name of the invention: hot melt adhesive composition. Publication date: December 08, 2006)

[Patent 5] Publication No. 10-2010-0041692 (Invention name: Moisture-curable polyurethane hot melt adhesive and laminates and moisture-permeable films using the same. Publication date: April 23, 2010)

The present invention is to solve the above problems of the prior art, a method of manufacturing a thermoplastic polyurethane hot melt film without using a release paper such as paper, PP, PE when manufacturing the TPU hot melt film by the T-die method and It is an object to provide a thermoplastic polyurethane hot melt film produced by the above method.

Another object of the present invention is to prepare a thermoplastic polyurethane hot melt film and a thermoplastic polyurethane hot melt film prepared by the above method to reduce environmental pollution, reduce waste disposal costs and manufacturing costs, as well as environmentally friendly products In providing.

Still another object of the present invention is to provide a thermoplastic polyurethane hot melt film which can prevent the adhesion and physical properties of the TPU hot melt film from falling off without using a release paper when the hot melt film is manufactured by the T-die method. To provide a manufacturing method and a thermoplastic polyurethane hot melt film produced by the above method.

When the thermoplastic polyurethane hot melt film is manufactured without using a release paper, the present invention is formulated with a thermoplastic polyurethane for a hot melt and a slip agent, and then extruded by a T-die method to produce a thermoplastic polyurethane hot melt film. It is characterized by consisting of a process.

1 is a view showing a method for manufacturing a TPU hot melt film with a release paper (Release Paper), such as a release paper or a release film according to the prior art.

2 is a view showing a method of manufacturing a TPU hot melt film without using a release paper (Release Paper) such as a release paper or a release film according to an embodiment of the present invention.

The present invention is a method for producing a thermoplastic polyurethane hot melt film without using a release paper, a conventional thermoplastic polyurethane for hot melt and a slip agent is blended, and then extruded by a T-die method to form a thermoplastic polyurethane hot melt film Characterized in that the manufacturing process.

Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings. In the following description will be presented a representative embodiment in the present invention to achieve the above technical problem. And other embodiments that can be presented with the present invention are replaced by the description in the configuration of the present invention.

In the present invention, it is possible to manufacture a TPU hot melt film having a precise thickness and width by transferring the extruded TPU hot melt film using a conveyor belt that can minimize the mechanical tension without using a plurality of guide rollers as in the prior art. Of course, especially when manufacturing a TPU hot melt film, a slip agent and an antistatic agent are combined with the TPU without using a release paper (release paper such as paper or release film such as PP or PE). It is intended to implement a method for producing a film, and a method for preparing a thermoplastic polyurethane hot melt film to prevent the adhesion and physical properties of the TPU hot melt film and the thermoplastic polyurethane hot melt film prepared by the above method.

That is, the technical features to be implemented in the present invention, 1) by using a conveyor belt in the long direction without using a plurality of guide rollers to minimize the machine tension to maintain the thickness and width of the TPU hot melt film uniformly, 2 ) When manufacturing the TPU hot melt film, a separate release paper is not required by combining the slip agent and the antistatic agent together with the TPU for the hot melt, and 3) adding the slip agent and the antistatic agent within the range of 1 to 20% by weight, respectively. TPU hot melt film (that is, TPU hot melt film with a release paper) is characterized by maintaining the adhesive strength and physical properties as it is.

In order to realize such a feature, a method of preparing a TPU hot melt film should be specifically disclosed, as well as a composition to be blended when the TPU hot melt film is prepared.

Specifically, the TPU hot melt film is typically impossible to manufacture without release paper (release paper, release paper in the form of paper, PP or PE form, etc.) due to the nature of the product (tacky), but the present invention In order to solve this problem, in manufacturing a TPU hot melt film, a slip agent and an antistatic agent are used as additives, and the TPU hot melt film is cooled by using a T-dies method. By using a conveyor belt that can minimize the mechanical tension without using a guide roller as in the prior art can implement the technical features described above as well as solve the problems of the prior art.

That is, the reason for using the slip agent and the antistatic agent in the present invention, 1) the slip agent not only removes the tacky (tacky) of the TPU hot melt film, but also eliminates the property of sticking to each other during the take-up and winding of the TPU hot melt film It is possible to produce a TPU hot melt film without release paper, and 2) The antistatic agent as an adjuvant to reduce the thickness deviation of the tacky and TPU hot melt film due to static electricity during the T-die extrusion operation to facilitate the processability.

Meanwhile, slip agents used in the present invention include montan wax, rubber-based elastomers (specifically, styrene-butadiene styrene block copolymer (SBS) and styrene ethylene / butylene resin (SEBS). }, It is preferable to use an inorganic substance (specifically, silica, talc, calcium carbonate) individually or in mixture of 1 or more. In addition, the antistatic agent is preferably an anionic antistatic agent, a cationic antistatic agent, a non-ionic antistatic agent and a conductive polymer series.

In the present invention, when producing the TPU hot melt film, as described above, the slip agent is used alone or mixed, but the blending amount is 1 to 20% by weight. That is, it is preferable to use 1-20 weight% of said slip agents with respect to 80-99 weight% of hot melt TPUs. In this case, if the slip agent is added in less than 1% by weight, the slip performance of the TPU hot melt film is inferior, and thus the operation is impossible without a release paper. In addition to poor extrusion processability, there is a problem that the adhesive strength is lowered.

In addition, in the present invention, when preparing a TPU hot-melt film, an antistatic agent is selectively used while using a slip agent alone or mixed, but the compounding amount is 1 to 20% by weight. That is, it is preferable to use 1-20 weight% of said slip agents and 1-20 weight% of said antistatic agents with respect to 60-98 weight% of hot melt TPUs. In this case, when the antistatic agent is added in an amount of 20% by weight or more, contamination of the TPU hot melt film due to blooming (blooming) may occur as well as the adhesive strength may be reduced, and when the antistatic agent is added in less than 1% by weight, the antistatic effect may be caused. There is a problem of weakening does not act as an adjuvant.

On the other hand, in the present invention, as shown above, the TPU hot melt film does not deteriorate in adhesion and physical properties, as well as without using a release paper (ie, a release paper in paper form or a release film such as PP or PE). In order to prepare a film, a TPU hot melt film without a release paper is prepared by compounding a hot melt TPU resin, a slip agent, and an antistatic agent into a pellet, and injecting the same into a T-die extruder. In this case, in order to maintain the thickness and width of the TPU hot melt film extruded through the T-die extruder at all times uniformly and to prepare a TPU hot melt film having a precise thickness and width, the conveyor in the cooling section as shown in FIG. Install the belt.

That is, as shown in FIG. 2, when the raw material (typically TPU + slip agent + antistatic agent for hot melt) is extruded through the T-tie extruder, the raw material is made into a film by a plurality of cooling rollers. The film is transported by a conveyor belt installed in the cooling section and cooled to be wound on the winder. At this time, the Kenvey belt can solve the problem (mechanical tension) of the plurality of guide rollers as in the prior art shown in Figure 1, specifically, by minimizing the mechanical tension TPU hot melt film passed through the cooling roller (that is, Since the film can be transported as it is, a thin film having a thickness of 0.2 mm or less), it is possible to produce a TPU hot melt film having a uniform and precise thickness and width at all times.

In Table 1 below, the thickness and width of the TPU hot melt film manufactured by the above-described method were measured and presented. Specifically, the thickness and width of the TPU hot melt film were measured when the conveyor belt was used as the present invention. When the conveyor belt was not used (ie, when using a plurality of guide rollers as in the prior art), the thickness and width of the TPU hot melt film were measured and presented in Table 1 in detail. At this time, the measured value of Table 1 is a result of taking a sample per roll (50m / roll) of the TPU hot melt film and measuring the thickness and width with a dial gauge.

Table 1

Production thickness specification			0.20 ± 0.04mm			Production width			54 inch
Used conveyor belt						Unused conveyor belt
No	thickness	width	No	thickness	width	No	thickness	width	No	thickness	width
One	0.21	54	21	0.21	54	One	0.21	54	21	0.23	52
2	0.22	54	22	0.21	54	2	0.22	53	22	0.22	56
3	0.22	54	23	0.22	54	3	0.22	53	23	0.22	53
4	0.23	54	24	0.21	54	4	0.23	52	24	0.21	51
5	0.21	54	25	0.20	54	5	0.24	51	25	0.25	57
6	0.22	54	26	0.20	54	6	0.27	52	26	0.26	52
7	0.20	54	27	0.20	54	7	0.18	54	27	0.29	54
8	0.21	54	28	0.22	54	8	0.21	54	28	0.24	53
9	0.23	54	29	0.21	54	9	0.23	55	29	0.26	56
10	0.22	54	30	0.22	54	10	0.26	51	30	0.24	54
11	0.22	54	31	0.23	54	11	0.24	53	31	0.25	51
12	0.23	54	32	0.21	54	12	0.26	52	32	0.21	52
13	0.21	54	33	0.20	54	13	0.25	54	33	0.19	50
14	0.20	54	34	0.21	54	14	0.23	55	34	0.18	53
15	0.20	54	35	0.20	54	15	0.24	51	35	0.22	49
16	0.21	54	36	0.21	54	16	0.21	53	36	0.26	54
17	0.22	54	37	0.22	54	17	0.18	56	37	0.24	56
18	0.20	54	38	0.23	54	18	0.27	55	38	0.28	52
19	0.22	54	39	0.21	54	19	0.24	54	39	0.19	48
20	0.21	54	40	0.20	54	20	0.23	52	40	0.25	52
Value	0.23	54.0	Value	0.23	54.0	Value	0.27	56.0	Value	0.29	57.0
Minimum value	0.20	54.0	Minimum value	0.20	54.0	Minimum value	0.18	51.0	Minimum value	0.18	48.0
medium	0.21	54.0	medium	0.21	54.0	medium	0.23	53.2	medium	0.23	52.8

As shown in Table 1, when the conveyor belt is used, it can be seen that the average value of the thickness and width of the TPU hot melt film is much more stable than the average value when the conveyor belt is not used, and when the conveyor belt is not used. It can be seen that the thickness and width of the TPU hot melt film is out of specification.

Hereinafter, the present invention will be described in detail based on the preferred embodiment of the present invention, but the present invention is not limited to the embodiment. In each of the examples presented below, the composition and the mixing ratio of each compound to be blended when preparing the TPU hot melt film according to the present invention are presented in detail, and the physical and thermal properties and adhesion of the TPU hot melt film prepared by the above method are also described. The strength test results are presented in detail. At this time, the TPU hot melt film is manufactured by a process of installing and conveying a conveyor belt in a cooling section while manufacturing by a T-dies extrusion method as described above, and this manufacturing process is shown in detail in FIG. Since the description of FIG. 2 is given in detail, the description of each embodiment will be omitted.

{Example 1}

In Example 1, when the TPU hot melt film was prepared, the compounding ratio, physical and thermal properties, and adhesive strength test results of using a slip agent alone (specifically, using charcoal wax) are shown in Tables 2 and 3. Specifically presented.

TABLE 2

division	How to measure		Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
division	standard	unit	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
HT-85A	Hot Melt TPU		100 wt%	80 wt%	90 wt%	99% by weight
Slipper (Montan Wax)				20 wt%	10% by weight	1 wt%
Hardness	ASTM D2240	Shore a	78 ± 2	78 ± 2	78 ± 2	78 ± 2
The tensile strength	ASTM D412	Kg / ㎠	Min.300	Min.300	Min.300	Min.300
Elongation	ASTM D412	%	Min.500	Min.500	Min.500	Min.500
MI (177 ° C, 2.16kgf)	ASTM D1238	g / 10min	10-20	20-30	15-25	10-20
Tm (melting point)	ASTM D3418	℃	114-122	114-122	114-122	114-122	DSC measurement
Tfb (flow point)	ASTM D3835	℃	114-122	112-120	114-122	114-122	Rheometer Measurement

As shown in Table 1, when the montan wax is used as a slip agent when preparing the TPU hot melt film, when the montan wax is added in an amount of 20 wt% or more, the extrusion workability is lowered and the adhesive strength is lowered as well as less than 1 wt%. Injecting the slip was not good enough to work without release paper.

TABLE 3

Fabric Type	Adhesion Test Condition and SPEC	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
Polyester fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.6	3.8	4.7	4.6	Dana mesh
Nylon fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.0	3.6	4.0	4.1	Bull head mesh

{Example 2}

In Example 2, when the TPU hot melt film was prepared, the compounding ratio, physical and thermal properties, and adhesive strength test results of using a slip agent alone (specifically, when using rubber-based Elastomer-SBS and SEBS) were described. Table 4 and Table 5 are presented in detail.

Table 4

division	How to measure		Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
division	standard	unit	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
HT-85A	Hot Melt TPU		100 wt%	80 wt%	90 wt%	99% by weight
Slip Agent (SBS)				20 wt%	10% by weight	1 wt%
Hardness	ASTM D2240	Shore a	78 ± 2	75 ± 2	76 ± 2	78 ± 2
The tensile strength	ASTM D412	Kg / ㎠	Min.300	Min.250	Min.250	Min.300
Elongation	ASTM D412	%	Min.500	Min.500	Min.500	Min.500
MI (177 ° C, 2.16kgf)	ASTM D1238	g / 10min	10-20	6-12	8-15	10-20
Tm (melting point)	ASTM D3418	℃	114-122	114-122	114-122	114-122	DSC measurement
Tfb (flow point)	ASTM D3835	℃	114-122	107-115	110-118	114-122	Rheometer Measurement

As shown in Table 4, when the SBS of the rubber-based elastomer is used as a slip agent when preparing the TPU hot melt film, when the SBS is added 20% by weight or more, the extrusion workability is lowered and the adhesive strength decreases as well as 1 weight. If less than% was added, the slippery properties were inferior, and work without release paper was impossible.

Table 5

Fabric Type	Adhesion Test Condition and SPEC	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
Polyester fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.6	3.6	3.8	4.5	Dana mesh
Nylon fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.0	3.5	4.0	4.3	Bull head mesh

{Example 3}

In Example 3 below, when preparing a TPU hot melt film, when the slip agent is used alone (specifically, when using inorganic fillers-silica, talc, calcium carbonate), physical properties and thermal properties, and adhesion The strength test results are shown in Tables 6 and 7.

Table 6

division	How to measure		Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
division	standard	unit	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
HT-85A	Hot Melt TPU		100 wt%	80 wt%	90 wt%	99% by weight
Slip Agent (Calcium Carbonate)				20 wt%	10% by weight	1 wt%
Hardness	ASTM D2240	Shore a	78 ± 2	82 ± 2	80 ± 2	78 ± 2
The tensile strength	ASTM D412	Kg / ㎠	Min.300	Min.250	Min.250	Min.300
Elongation	ASTM D412	%	Min.500	Min.400	Min.500	Min.500
MI (177 ° C, 2.16kgf)	ASTM D1238	g / 10min	10-20	6-12	8-15	10-20
Tm (melting point)	ASTM D3418	℃	114-122	114-122	114-122	114-122	DSC measurement
Tfb (flow point)	ASTM D3835	℃	114-122	118-125	116-123	114-122	Rheometer Measurement

As shown in Table 6, when the inorganic filler-calcium carbonate was used as a slip agent when preparing the TPU hot-melt film, when the calcium carbonate was added 20 wt% or more, the extrusion workability was lowered and the adhesive strength was lowered. When less than 1% by weight was added, slip performance was inferior and work was not possible without release paper.

TABLE 7

Fabric Type	Adhesion Test Condition and SPEC	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
Polyester fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.6	3.4	3.8	4.5	Dana mesh
Nylon fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.0	3.5	3.6	4.2	Bull head mesh

{Example 4}

In Example 4, when the TPU hot melt film was prepared, the blending ratio, physical and thermal properties, and adhesive strength test results were obtained when the slip agent was mixed (specifically, when the montan wax was mixed with SBS and calcium carbonate). It is shown in Table 8 and Table 9 specifically.

Table 8

division	How to measure		Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
division	standard	unit	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
HT-85A	Hot Melt TPU		100 wt%	80 wt%	90 wt%	99% by weight
Slipper (Montan Wax)				5% increase	3 wt%	0.2 wt%
Slip Agent (SBS)				10% by weight	5 wt%	0.5 wt%
Slip Agent (Calcium Carbonate)				5 wt%	2 wt%	0.3 wt%
Hardness	ASTM D2240	Shore a	78 ± 2	76 ± 2	77 ± 2	78 ± 2
The tensile strength	ASTM D412	Kg / ㎠	Min.300	Min.250	Min.250	Min.300
Elongation	ASTM D412	%	Min.500	Min.400	Min.500	Min.500
MI (177 ° C, 2.16kgf)	ASTM D1238	g / 10min	10-20	6-12	8-15	10-20
Tm (melting point)	ASTM D3418	℃	114-122	114-122	114-122	114-122	DSC measurement
Tfb (flow point)	ASTM D3835	℃	114-122	118-125	116-123	114-122	Rheometer Measurement

As shown in Table 8, when using a slip agent blended with Montan wax, SBS and calcium carbonate when preparing a TPU hot melt film, the mixed slip agent is also less than 20% by weight of extrusion processability and the adhesive strength of In addition to the deterioration, the addition of less than 1% by weight was not slippery, it was impossible to work without release paper (release paper).

Table 9

Fabric Type	Adhesion Test Condition and SPEC	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
Polyester fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.6	3.8	4.0	4.4	Dana mesh
Nylon fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.0	3.6	4.2	4.2	Bull head mesh

{Example 5}

In Example 5 below, in the preparation of the TPU hot melt film, when the slip agent and the antistatic agent are used in combination (specifically, when using a mixture of montan wax, SBS and calcium carbonate, and the antistatic agent) and physical properties and Thermal properties and adhesion strength test results are shown in Table 10 and Table 11.

Table 10

division	How to measure		Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
division	standard	unit	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
HT-85A	Hot Melt TPU		100 wt%	60% by weight	80 wt%	98% by weight
Slipper (Montan Wax)				5 wt%	3 wt%	0.2 wt%
Slip Agent (SBS)				10% by weight	5 wt%	0.5 wt%
Slip Agent (Calcium Carbonate)				5 wt%	2 wt%	0.3 wt%
Antistatic agent				20 wt%	10% by weight	1 wt%
Hardness	ASTM D2240	Shore a	78 ± 2	76 ± 2	77 ± 2	78 ± 2
The tensile strength	ASTM D412	Kg / ㎠	Min.300	Min.200	Min.250	Min.300
Elongation	ASTM D412	%	Min.500	Min.400	Min.450	Min.500
MI (177 ° C, 2.16kgf)	ASTM D1238	g / 10min	10-20	8-12	10-20	10-20
Tm (melting point)	ASTM D3418	℃	114-122	110-120	110-120	114-122	DSC measurement
Tfb (flow point)	ASTM D3835	℃	114-122	110-118	110-118	114-122	Rheometer Measurement

As shown in Table 10, when the TPU hot melt film is used in combination with montan wax, SBS, calcium carbonate, and an antistatic agent, the TPU due to blooming when 20 wt% or more of the antistatic agent is added. Contamination of the hot-melt film occurred and a decrease in the adhesive strength was also confirmed, and when less than 1% by weight was added, it was confirmed that the antistatic effect was weak and did not play a role as an adjuvant.

Table 11

Fabric Type	Adhesion Test Condition and SPEC	Prior art TPU hot melt film	TPU hot melt film of the present invention	TPU hot melt film of the present invention	TPU hot melt film of the present invention	Remarks
Polyester fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.6	4.3	4.4	4.6	Dana mesh
Nylon fabric	130 ℃, 50kg / ㎠, 30sec (2.5kgf / cm or more)	4.0	3.8	3.8	4.0	Bull head mesh

According to the present invention, when manufacturing a TPU hot melt film by a T-die method, a hot melt TPU is used as a main component, and a slip agent and an antistatic agent are combined therewith without using a separate release paper. Not only can the TPU hot melt film be manufactured, but the adhesive force and physical properties of the TPU hot melt film can be maintained as it is.

In addition, the present invention in the process of manufacturing the TPU hot melt film by using a conveyor belt to transfer the TPU hot melt film without using a plurality of guide rollers by minimizing the mechanical tension which is a problem of the conventional guide rollers to precise thickness and width Eggplant has the effect of producing a TPU hot melt film.

In addition, the present invention can eliminate the waste generated during the shoe manufacturing process by not using the release paper (release paper, release paper, release film), which can lower the manufacturing cost of the TPU hot melt film and also reprocess the waste And not only can reduce the costs incurred at the time of disposal, but also to eliminate the carbon dioxide generated during the reprocessing process, there is an advantage to implement an environmentally friendly TPU hot melt film by reducing the environmental pollution caused by waste.

Claims

In the method for producing a thermoplastic polyurethane hot melt film without using a release paper,

A method of manufacturing a thermoplastic polyurethane hot melt film, comprising the steps of mixing a conventional thermoplastic polyurethane for hot melt and a slip agent, and then extruding it by a T-die method to produce a thermoplastic polyurethane hot melt film.
The method of claim 1,

80 to 99% by weight of the thermoplastic polyurethane and 1 to 20% by weight of the slip agent, the method for producing a thermoplastic polyurethane hot melt film, characterized in that consisting of.
The method of claim 2,

The slip agent is a method for producing a thermoplastic polyurethane hot melt film, characterized in that any one of the montan wax, rubber-based elastomer, inorganic material.
The method of claim 3,

Method for producing a thermoplastic polyurethane hot melt film, characterized in that the use of the slip alone or mixed with one or more.
The method according to claim 3 or 4,

The inorganic material is a method for producing a thermoplastic polyurethane hot melt film, characterized in that any one selected from silica, talc, calcium carbonate
The method of claim 1,

When the thermoplastic polyurethane and the slip agent are blended, a method of producing a thermoplastic polyurethane hot melt film, characterized in that the process is further made by adding an antistatic agent.
The method of claim 6,

60 to 98% by weight of the thermoplastic polyurethane, 1 to 20% by weight of the slip agent and 1 to 20% by weight of the antistatic agent.
The method according to claim 1 or 2 or 6 or 7,

Method of producing a thermoplastic polyurethane hot melt film, characterized in that the process consisting of conveying the thermoplastic polyurethane hot melt film extruded by the T-tie method to a conveyor belt.
In thermoplastic polyurethane hot melt films that do not require conventional release paper,

A thermoplastic polyurethane film comprising a thermoplastic polyurethane for hot melt and a slip agent.