KR102428393B1 - Coating composition for air-mat sheet, method for manufacturing the same and air-mat using the same - Google Patents

Abstract

The present invention relates to a composition for coating a fabric for an inflatable air mat which comprises thermoplastic polyurethane, a filler, a processing lubricant, and a nanotube composite, a preparation method therefor, and an inflatable air mat using the same, wherein the proportions of the thermoplastic polyurethane, the filler, the processing lubricant, and the nanotube composite are 100 parts by weight, 10-20 parts by weight, 1-5 parts by weight, and 1-10 parts by weight, respectively.

Description

Composition for coating fabric for air mat, manufacturing method thereof, and air mat using same

The present invention is coated on the surface of the woven fabric to have airtightness and gas barrier properties, so it can be kept in a trapped state without air leaking, and the fabric has excellent flexibility and elasticity when used, making an air mat with excellent comfort properties It relates to a composition for coating fabric for an air mat, a method for manufacturing the same, and an air mat using the same.

Air mats provide a soft feel by injecting air inside, and they are made of soft materials on the surface and are widely used to replace beds and chairs.

In particular, the air mat has the advantage that it can be folded and stored in the form of a thin sheet, cloth, pocket, etc. when the injected air is taken out, and thus has an advantage in terms of portability and storability.

In general, air mats have various uses, but in particular, air mats having a shape and size that users can sit or lie down on are mainly used. It is widely used.

In addition to airtightness to keep the amount of air filled inside such an air mat, it plays an important role in the feeling of use to have a constant tensile strength and elongation so that it is not easily destroyed or deformed even under a load.

On the other hand, in order to improve the durability of the air mat itself, it should have excellent durability and support to improve airtightness and prevent damage caused by high external loads or sharp or hard objects. Due to the characteristics of air mats that have to be rolled up or stored, it is not easy to satisfy both durability and storability at the same time.

In addition, if the air mat is easily deformed like a balloon in a state where air is injected inside, there is no sufficient support power when the user sits or leans, so the user may feel unstable or easily detached from the air mat. There is a problem in that you can feel comfortable using it, such as feeling that it can be used.

Accordingly, there is a need to develop an air mat that satisfies the function of the air mat itself and has improved durability, particularly, bending durability, and improved user comfort characteristics.

Republic of Korea Patent No. 2207341 Republic of Korea Registered Utility Model No. 0486308

An object of the present invention is to provide an air mat having excellent tactile feel to the user using a woven fabric, and to provide a composition for coating an air mat fabric that can be maintained for a long time without air leaking and an air mat using the same.

The present invention also maintains excellent adhesion between the fabric fabric and the coating layer, and the durability of the coating layer itself is also excellent, so it is not easily damaged by an increase in load or deformation of the shape during use, in a folded storage state before and after use. aims to provide

In order to solve the above problems, the composition for coating air mat fabric according to the present invention is 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of filler, 1 to 5 parts by weight of processing lubricant, and 1 to 10 parts by weight of nanotube composite includes wealth.

In the present invention, the nanotube composite may be a hollow polymer tube filled with thermoplastic polyurethane.

More specifically, the nanotube composite has an average diameter of 10 to 20 nm (nanometers), an average length of 200 to 250 nm (nanometers), and the hollow tube is silicone rubber, butyl rubber, neoprene rubber, nitrile rubber It may include one or more selected from the group consisting of.

In addition, the manufacturing method of the composition for air mat fabric coating,

(a) preparing a thermoplastic polyurethane into a continuous fiber;

(b) preparing a tube composite in the form of a continuous fiber by coating a polymer on the surface of the continuous fiber of the thermoplastic polyurethane;

(c) preparing a nanotube composite by cutting the tube composite in the form of continuous fibers into filaments having an average length of 200 to 250 nm (nanometers);

(d) putting the nanotube composite into a mixed solvent in which isopropanol and ethanol are mixed in a volume ratio of 1: 2 to 4, mixing for 20 to 30 hours, and evaporating the solvent; and

(e) mixing 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of a filler, 1 to 5 parts by weight of a processing lubricant, and 1 to 10 parts by weight of the nanotube composite that has undergone the step (d); includes

The present invention is also a woven fabric; and a coating layer formed of a composition for coating an air mat fabric located on one surface of the woven fabric; It provides an air mat comprising a.

The composition for coating an air mat fabric according to the present invention is applied to one surface of the fabric fabric to form a coating layer, thereby preventing air from permeating and has an effect suitable for use in the manufacture of an air mat.

The present invention has the advantage that, while being able to withstand a high load strongly, the fabric is stretched/contracted in a certain range depending on the load, so that the user can feel comfortable when using it as an air mat.

1 is a photograph of an air mat fabric sample coated on one side of the composition for coating air mat fabric according to an embodiment of the present invention.
2 is a graph showing the tensile strength test results of the air mat fabrics of Examples and Comparative Examples.
to be.
3 is a graph showing the elongation test results of the air mat fabrics prepared in Examples and Comparative Examples.
4 is a graph showing the resilience test results of the air mat fabrics of Examples and Comparative Examples.

Hereinafter, each configuration of the present invention will be described in more detail so that those of ordinary skill in the art to which the present invention pertains can easily carry out, but this is only an example, and the scope of the present invention is defined by the following contents Not limited.

As used herein, "preferred" or "preferably" refers to an embodiment of the invention that has certain advantages under certain conditions. However, other embodiments may also be preferred under the same or different conditions. Furthermore, one or more preferred embodiments do not mean that other embodiments are not useful, nor do they exclude other embodiments that are within the scope of the present invention.

As used herein, the term "comprises" is used to enumerate materials, compositions, devices, and methods useful in the present invention and is not limited to the enumerated examples.

The composition for coating air mat fabric according to the present invention includes 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of filler, 1 to 5 parts by weight of processing lubricant, and 1 to 10 parts by weight of nanotube composite.

The present invention is a coating composition used for an air mat that can be used for camping, car foil, or a simple mat. By forming a coating layer on the back side of a fabric having air permeability and somewhat poor airtightness, air is maintained without falling out. , it can be used as an air mat because it is not easily deformed or deformed by external pressure.

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

1. Thermoplastic polyurethane

Thermoplastic polyurethane (hereinafter referred to as TPU) is a polyurethane having excellent elastic properties and thermoplasticity.

Polyurethane is a polymer containing a urethane bond formed by the reaction of polyisocyanate and polyalcohol, and thermoplastic polyurethane is prepared by melting with heat, and has the advantage of being able to be processed by various methods such as extrusion, vacuum molding, and thermal bonding. As it has thermoplasticity, it can be used in various fields by methods such as extrusion and injection, and in some cases, it has a characteristic that it can be manufactured and processed in the form of continuous fibers.

Thermoplastic polyurethane has excellent tensile and tear strength, durability and friction resistance, and has the advantage of being environmentally friendly.

In particular, thermoplastic polyurethane can be used at a high temperature from minus 40°C to 70-80°C, and has the advantage that it is not easily deformed by heat or cold air, so it can be used as an air mat in various environments.

The thermoplastic polyurethane may preferably be a polyester-based thermoplastic polyurethane.

Since the abrasion resistance and elasticity are superior to that of the polyether-based thermoplastic polyurethane, it has more suitable properties for use in the composition for coating air mat fabric.

2. Filler

The filler controls the viscosity of the coating composition to provide processability, and serves to prevent it from being easily deformed by an external force after it is formed into a coating layer.

Specifically, the filler may be used without being particularly limited as long as it is a filler that can be used in a paint or a coating film. For example, as the inorganic filler, a filler of a ceramic material may be used, and as the organic filler, a filler composed of polymer particles, powder, or the like may be used. In addition, if necessary, a filler in the form of a composite may be used.

More specifically, calcium carbonate, titanium dioxide, silica, PMMA (polymethyl methacrylate) particles, acrylic polymer particles, etc. may be used, preferably, a mixture of calcium carbonate and titanium dioxide may be used, most preferably Alternatively, a mixture of calcium carbonate and titanium dioxide in a weight ratio of 1:4 may be used.

In the case of using the mixture mixed in the above ratio, in the step of mixing with the thermoplastic polyurethane, the mixing time is shortened and the dispersibility is excellent compared to the case of using inorganic, organic or composite fillers having different mixing times. This has the advantage of securing uniform physical properties on the entire surface of the coating layer.

When the content of titanium dioxide is excessive than the above ratio, the viscosity of the coating composition increases, and the rate at which the coating layer is cured is rapidly increased, so there may be a problem that workability is reduced, and it is included in a small amount than the above content In this case, there may be a problem in that the dispersibility of the filler in the coating composition is lowered, and the fillers are agglomerated and agglomerated.

The filler may be added in an amount of 10 to 20 parts by weight based on 100 parts by weight of the thermoplastic polyurethane, more preferably, 10 to 15 parts by weight, and most preferably, 11 to 13 parts by weight.

When added in excess than the above content, due to the increase in the viscosity of the coating composition, it becomes difficult to apply the coating composition by a spray coating method, and thus the thickness of the coating layer is not formed uniformly, depending on the position of the coating layer There may be a problem in that durability may be deteriorated, and there is a problem in that a user's comfort characteristics may be deteriorated during use.

3. Processing lubricant

A processing lubricant is a material added to improve productivity, so that it can be easily applied when coating the fabric surface of the coating composition, and can be easily maintained in a liquid state.

As the processing lubricant, for example, any one selected from the group consisting of montan wax, fatty acid esters and mixtures thereof may be used, and most preferably, montan wax may be used.

The processing lubricant may be added in an amount of 1 to 5 parts by weight, preferably 2 to 5 parts by weight, based on 100 parts by weight of the thermoplastic polyurethane.

When it is added in excess than the above content, there may be a problem that the adhesion with the fabric is lowered during the formation of the coating layer, the peel strength is lowered, and the bending durability is lowered. In contrast, there is no change in the physical properties of the coating composition, and eventually, there may be a problem that the workability during the coating operation is reduced.

4. Nanotube Composites

In the present invention, the nanotube composite is an additive added to improve the comfort characteristics of the air mat and at the same time have improved durability.

The nanotube composite has a form in which a thermoplastic polyurethane is filled inside a hollow polymer tube, and in its manufacture, by forming a coating layer in a tubular shape with a uniform thickness on the surface after preparing a thermoplastic polyurethane core fiber, It can be made into a tube composite.

However, the manufacturing method as described above is only an exemplary substrate, and any method capable of manufacturing the nanotube composite having the same shape may be used. For example, it is also possible to prepare a nanotube composite by first preparing a hollow tube-shaped tube, then filling the inside of the thermoplastic polyurethane and hardening it.

Meanwhile, the hollow tube may include at least one selected from the group consisting of silicone rubber, butyl rubber, neoprene rubber, and nitrile rubber.

Most preferably, nitrile rubber can be used, which has excellent adhesion to the fabric after the formation of the coating layer, and can be maintained without deformation of the coating layer itself even when the air mat is exposed to high and low temperatures, This is because it has excellent adhesion and high peel strength.

Meanwhile, the nanotube composite may have an average diameter of 10 to 20 nm (nanometers) and an average length of 200 to 250 nm (nanometers).

More preferably, the average diameter may be 11 to 15 nm (nanometers), and the average length may be 210 to 230 nm (nanometers).

If it is thicker than the average diameter, there is a problem that deformation occurs in the coating layer due to repeated bending or peeling from the fabric due to a decrease in bending durability after forming the coating layer, and when it is thinner than the average diameter, comfort There may be a problem in that the characteristics are deteriorated, and the bearing capacity under a high load is greatly lowered.

By including the nanotube composite, the elongation rate of the coating layer itself is improved compared to short fibers and physical reinforcing fibers that may be added as other additives, and by improving the bearing capacity under a high load, the comfort characteristics are greatly improved. do.

Therefore, it is characterized in that it provides superior comfort properties than using short fibers of the same average diameter and average length.

Furthermore, the thermoplastic polyurethane inside is exposed to high temperatures, and the thermoplastic polyurethane inside is integrally connected with the thermoplastic polyurethane that forms the main material of the coating layer according to changes in the surrounding environment exposed to low temperatures and the extension and contraction of the coating layer, There is an effect of preventing deterioration of durability and elongation.

Therefore, compared to filling other materials inside, the elongation rate is excellent.

On the other hand, when the length of the nanotube composite is shorter than the length, it is difficult to form a coating layer by a spray coating method by increasing the viscosity of the coating composition. There may be problems in that the workability is lowered and the tensile strength is also lowered. If it is longer than the above length, there may be a problem in that the tensile strength is lowered.

The hollow tube constituting the nanotube composite may have a thickness of 0.1 to 3 nm, preferably 1 to 2 nm.

When it is thicker than the thickness, the strain rate according to the temperature change of the nanotube composite increases, there is a problem that the temperature change rate of the coating layer itself increases, and when it is thinner than the thickness, the core fiber, that is, adding a thermoplastic polyurethane fiber There is a problem with the same effect.

The nanotube composite may be added in an amount of 1 to 10 parts by weight based on 100 parts by weight of the thermoplastic polyurethane. Preferably, it may be added in an amount of 2 to 8 parts by weight, and most preferably, it may be added in an amount of 3 to 5 parts by weight.

When it is added in a small amount than the above weight, compared to the case where it is not added, there is a slight problem in the effect of improving physical properties such as comfort properties and tensile strength. , abrasion resistance, elasticity, etc., there is a problem, and there may be a problem that the durability of the coating layer is greatly reduced because a change in the physical properties of the coating layer may be induced according to a temperature change from high to low temperature.

5. Manufacturing method

The composition for coating air mat fabric according to the present invention can be manufactured through the following process.

(a) preparing a thermoplastic polyurethane into a continuous fiber;

(b) preparing a tube composite in the form of a continuous fiber by coating a polymer on the surface of the continuous fiber of the thermoplastic polyurethane;

(c) preparing a nanotube composite by cutting the tube composite in the form of continuous fibers into filaments having an average length of 200 to 250 nm (nanometers);

(d) putting the nanotube composite into a mixed solvent in which isopropanol and ethanol are mixed in a volume ratio of 1: 2 to 4, mixing for 20 to 30 hours, and evaporating the solvent; and

(e) mixing 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of a filler, 1 to 5 parts by weight of a processing lubricant, and 1 to 10 parts by weight of the nanotube composite that has undergone the step (d);

By performing sequentially, it is possible to prepare a composition for coating air mat fabric according to the present invention.

For each configuration in the manufacturing method, reference may be made to the above-described composition for coating air mat fabric.

The step (a) is a step of producing a continuous thermoplastic polyurethane fiber, and as long as it is a method for producing a continuous fiber using a polymer in the art, it is not particularly limited and can be used. The continuous fiber is preferably the same as the thermoplastic polyurethane constituting the main material of the composition for coating air mat fabric according to the present invention.

The continuous fiber may be prepared by winding on a roller or the like, and step (b) may be performed directly in succession. By coating the polymer on the surface of the continuous fibers in step (b), a tube composite in the form of continuous fibers is prepared.

The polymer forms the above-described hollow tube, which is manufactured into a continuous fiber and then cut into a filament of a certain length through (c) step to prepare a nanotube composite.

The nanotube composite cut into filaments is put in a mixed solvent of isopropanol and ethanol and mixed for a long time. This is to remove impurities remaining on the surface of the nanotube composite during the manufacturing process, prevent adhesion between the nanotube composites, and prevent agglomeration, thereby further improving dispersibility when preparing the coating composition.

By going through such a process, it has the effect of improving the dispersibility of the nanotube composite in the coating composition, ensuring uniform physical properties of the coating layer, and improving the adhesion between the fabric and the coating layer and the peeling strength.

After completely evaporating the mixed solvent, 100 parts by weight of a thermoplastic polyurethane, 10 to 20 parts by weight of a filler, 1 to 5 parts by weight of a processing lubricant, and 1 to 10 parts by weight of the nanotube composite that has undergone the step (d) are mixed to form an air mat fabric A composition for coating is prepared.

1 is a photograph of an air mat fabric sample coated with a composition for coating an air mat fabric according to an embodiment of the present invention. This is a photograph of the prepared sample.

Referring to FIG. 1 , the prepared air mat coating composition is coated on one surface of a woven fabric to prepare an air mat fabric. The woven fabric is preferably a polyester woven fabric, and in terms of durability and load bearing capacity of the fabric, the woven fabric is preferably a plain woven fabric.

Hereinafter, it will be described in more detail based on the embodiments of the present invention, but these are merely exemplary descriptions for the understanding of the present invention, and the scope of the present invention is not limited or limited to the following examples.

<Example>

Thermoplastic polyurethane is prepared by manufacturing continuous fibers having an average diameter of 8 nm (nanometers) and a thickness of around 8 nm (nanometers) and winding them on a roller. A coated continuous fiber was prepared. The coated continuous fibers were cut at intervals of 220 nm (nanometers) after the coating layer on the surface was sufficiently cured to prepare a nanotube composite.

The prepared nanotube composite was put into a mixed solvent in which isopropanol (CAS No. 67-63-0) and ethanol were mixed in a volume ratio of 1: 3 and mixed for 24 hours while maintaining the temperature condition at 0 °C. After mixing, the solvent was evaporated to obtain a nanotube composite, which was mixed with 100 parts by weight of thermoplastic polyurethane (ESTANE 58134 TPU), 12 parts by weight of calcium carbonate and titanium dioxide (mixed in a 1: 4 weight ratio), 3 parts by weight of montan wax and A composition for coating was prepared by mixing together. At this time, the nanotube composite was added in an amount of 4 parts by weight.

The coating composition was sprayed on the surface of the prepared polyester woven fabric (plain weave) and dried at room temperature to prepare a coating fabric, and using this, an air mat with a size of 183 * 51 * 3.8 cm was prepared.

<Comparative Example 1>

An air mat was prepared in the same manner as in Example, except that the surface coating layer of the nanotube composite was prepared using isoprene rubber in the above example.

<Comparative Example 2>

An air mat was prepared in the same manner as in Example, except that the surface coating layer of the nanotube composite was prepared using butadiene rubber in the above example.

<Comparative Example 3>

An air mat was prepared in the same manner as in Example, except that the average diameter of the thermoplastic polyurethane fiber, which is the core fiber of the nanotube composite, was 20 nm (nanometers) in the above example.

<Comparative Example 4>

An air mat was prepared in the same manner as in Example, except that the average diameter of the thermoplastic polyurethane fiber, which is the core fiber of the nanotube composite, was 2 nm (nanometer) in the above example.

<Comparative Example 5>

An air mat was prepared in the same manner as in Example, except that polypropylene fiber was used instead of thermoplastic polyurethane fiber as the core fiber of the nanotube composite in Example.

<Comparative Example 6>

An air mat was prepared in the same manner as in Example, except that a thermoplastic urethane filament fiber having an average diameter of 10 nm (nanometers) and an average length of 200 nm (nanometers) was used instead of the nanotube composite in the above Examples.

<Comparative Example 7>

An air mat was prepared in the same manner as in Example, except that the nanotube composite having a length of 150 nm (nanometers) was used in the Example.

<Comparative Example 8>

An air mat was prepared in the same manner as in Example, except that the nanotube composite having a length of 300 nm (nanometers) was used in the Example.

<Comparative Example 9>

An air mat was manufactured in the same manner as in Example, except that a nylon woven fabric was used instead of the polyester woven fabric in the above embodiment.

<Reference example>

An air mat was prepared in the same manner as in Example, except that isopropanol was used instead of the mixed solvent in the process of mixing and evaporating the nanotube composite into a mixed solvent in the above example.

Experiments were carried out in the following way on the manufactured fabric and air mat, and the results are shown in Table 1.

[Test method]

1) Tensile strength measurement test

A tensile strength measurement test was performed on the prepared air mat fabric according to ASTM D 5034.

2) Elongation measurement test

For the manufactured air mat fabric, an elongation measurement test was performed according to ASTM D 5034.

3) Coating layer 180° peel strength test

Peel strength was measured using a peel strength meter (UTA™-500N).

4) Bending durability evaluation test

Cut the manufactured air mat fabric into a 50*50cm size specimen, draw a straight line perpendicular to the corresponding side at a position of 25 cm based on one side of the square, and let the fabric completely overlap and fold around the straight line once. The number of bending cycles at which incontinence, etc., which seems to have peeled off on the surface with a coating layer on the surface, was first confirmed was measured.

It proceeds based on bending up to 10,000 times, and if there is no deformation in the fabric even after bending 10,000 times, it is evaluated as normal.

5) Rebound elasticity test

After filling the inside of the manufactured air mat with air about 80%, dropping an iron bead (16 mm) from a height of 2 m and measuring the height of the repulsion and bouncing (evaluation according to JIS K6301, unit %)

6) Evaluation of comfort characteristics

This was conducted by referring to the experiment on the sag factor, a method for measuring the comfort characteristics of automobile seat pads.

Air Mat Comfort Characteristics = (10% compression force)/(30% compression force)

division Example comparative example Reference example One 2 3 4 5 6 7 8 9 The tensile strength
(kg/cm2) 550 450 510 497 446 532 500 300 250 516 541 Elongation (%) 150 143 141 149 130 110 120 137 132 139 145 Coating layer 180° peel strength
(kgf/cm) 56 21 30 55 51 55 50 48 55 16 53 Bending durability evaluation normal underachiever underachiever underachiever normal normal normal normal normal underachiever normal Resilience modulus (%) 65 25 55 60 20 65 55 60 70 55 62 Comfort Characteristics Assessment 4.0 3.0 2.2 2.0 1.0 3.5 3.1 3.8 3.5 3.0 3.5

2 is a graph showing the tensile strength test results of the air mat fabrics of Examples and Comparative Examples, FIG. 3 is a graph showing the elongation test results of the air mat fabrics prepared in Examples and Comparative Examples, and FIG. 4 is comparison with Examples It is a graph showing the rebound resilience test result of the air mat fabric of Example.

Referring to Table 1 and FIGS. 2 to 4, the air mat fabric manufactured according to the embodiment has excellent tensile strength and excellent elongation, so that external damage or deformation due to high load during use is prevented. .

In addition, as the peel strength of the coating layer was high and the bending durability evaluation was confirmed to be normal, the coating layer does not peel off easily, and it is not deformed even by repeated bending of the fabric, such as repeated air injection and air evacuation, and then folded and stored. It has excellent durability.

In particular, the air mat of the embodiment has a high resilient modulus and excellent comfort characteristics, so that when a user lies or sits on the air mat, the air mat is not easily deformed and supports the user's load. It can be seen that it does not give a feeling of being worn out or has an excellent feeling of use.

Claims (5)

As a composition for coating an air mat fabric comprising 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of a filler, 1 to 5 parts by weight of a processing lubricant, and 1 to 10 parts by weight of a nanotube composite,
The nanotube composite is a hollow polymer tube filled with thermoplastic polyurethane,
The nanotube composite has an average diameter of 10 to 20 nm (nanometers), and an average length of 200 to 250 nm (nanometers),
The hollow polymer tube will include at least one selected from the group consisting of silicone rubber, butyl rubber, neoprene rubber, and nitrile rubber,
Composition for coating air mat fabric.
delete delete As a method of manufacturing the composition for coating air mat fabric according to claim 1,
(a) preparing a thermoplastic polyurethane into a continuous fiber;
(b) preparing a tube composite in the form of a continuous fiber by polymer coating on the surface of the thermoplastic polyurethane continuous fiber;
(c) preparing a nanotube composite by cutting the tube composite in the form of continuous fibers into filaments having an average length of 200 to 250 nm (nanometers);
(d) putting the nanotube composite into a mixed solvent in which isopropanol and ethanol are mixed in a volume ratio of 1: 2 to 4, mixing for 20 to 30 hours, and evaporating the solvent; and
(e) mixing 100 parts by weight of thermoplastic polyurethane, 10 to 20 parts by weight of a filler, 1 to 5 parts by weight of a processing lubricant, and 1 to 10 parts by weight of the nanotube composite that has undergone the step (d);
A method of manufacturing a composition for coating air mat fabric comprising a.
woven fabric; and
A coating layer formed of the composition for coating the air mat fabric according to claim 1 located on one surface of the woven fabric;
Air mat containing.

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