TWI644793B - Package tray panel comprising polyester resin having low melting point and preparation method thereof - Google Patents

Abstract

The present invention relates to a packaging tray panel including a low-melting polyester resin fiber layer and a method for preparing the same. The present invention provides a package that achieves excellent processability and has excellent price competitiveness even without reducing physical properties such as strength and durability. Tray panel.

Description

Packaging tray panel containing low melting point polyester resin and preparation method thereof

The invention relates to a packaging tray panel containing a low-melting polyester resin and a preparation method thereof.

External parts such as doors and fenders, or built-in parts such as seats, door trims, and packaging tray panels are mounted on the car body. The car body needs to provide stability, space, and comfort to passengers, including drivers.

Wherein, the packaging tray panel is disposed behind the seat seat. Specifically, the packaging tray panel is used to support a seat seat and to block the interior of the car and the packaging tray. In addition, the packaging tray panel is used by a passenger seated in a seat to store various components or gears, and to install a plurality of functional components such as an acoustic and fragrance, as needed.

The existing packaging tray panel is mainly prepared by using a fiber-reinforced resin board or a polyurethane foam.

A fiber-reinforced resin sheet is prepared by using a natural fiber such as hemp fiber to plate a reinforced polypropylene resin. However, because these fiber-reinforced resin boards use natural fibers, the odor generated during the product molding process makes the working environment unfavorable. When applied to vehicles, the odor generated causes consumer dissatisfaction. In addition, mildew is present in natural resins suitable for the fiber-reinforced resin boards. When microorganisms such as bacteria reproduce, they generate odors and emit hidden dangers of components harmful to health. In addition, it is difficult to reduce the weight of a fiber-reinforced resin sheet using the natural fibers.

Alternatively, in a packaging tray panel using a polyurethane foam, there is a problem that a toxic gas is discharged during an incineration process. Further, the polyurethane-based foam has a soft property when pressed by hand. In order to improve these, a packaging tray panel is also prepared by including a glass fiber or a glass sheet in a polyurethane foam. However, the packaging tray panel containing glass fibers or glass sheets has the problem of hindering the working environment of workers due to the increase in weight and the generation of glass dust during the preparation and transfer processes.

Know-how Patent literature

(Patent Document 1) Korean Patent No. 10-0837082.

In order to solve such a problem, an object of the present invention is to provide an environmentally friendly packaging pallet panel having excellent processability and excellent price competitiveness.

In order to achieve the above object, in an embodiment of the present invention, a packaging tray panel is provided that includes a fiber layer mixed with a first polyester resin fiber and a second polyester resin fiber, wherein the first polyester resin fiber The melting point is 180 ° C to 250 ° C or the softening point is 100 ° C to 150 ° C. The melting point of the second polyester resin fiber is higher than 250 ° C. The mixing ratio of the first polyester resin fiber and the second polyester resin fiber forming the fiber layer can be controlled within a range of 1: 9 to 9: 1 by weight.

Furthermore, in still another embodiment of the present invention, a method for preparing a packaging tray panel is provided, which includes mixing a first polyester resin fiber and a second polyester resin fiber in a temperature range of 80 ° C to 200 ° C. The fiber layer is subjected to a thermoforming step, wherein the melting point of the first polyester resin fiber is 180 ° C to 250 ° C or the softening point is 100 ° C to 150 ° C, and the melting point of the second polyester resin fiber is 255 ° C or more. The mixing ratio of the first polyester resin fibers and the second polyester resin fibers forming the fiber layer can be controlled within a range of 1: 9 to 9: 1 by weight ratio.

Since the packaging tray panel of the present invention uses a low-melting point polyester resin, it is not necessary to reduce physical properties such as strength and durability, and it is also possible to achieve excellent processability.

Various modifications can be made to the present invention and various embodiments can be described in detail.

However, the present invention is not limited to a specific embodiment, and should be understood to include all changes, equivalents, and alternatives included in the spirit and technical scope of the present invention.

It should be understood that, in the present invention, terms such as “including” or “having” are used to specify that the features, digits, steps, actions, constituent elements, parts, or a combination thereof described in the specification exist, rather than It is used to exclude the existence or additional possibility of one or more other features or resins, steps, actions, constituent elements, components, or a combination thereof in advance.

In the present invention, "parts by weight" means a weight ratio between the components.

Meanwhile, in the present invention, the “mole portion” refers to the number of moles (mol) between the components.

Further, in the present invention, the "melting point (Tm)" refers to a temperature at which a resin in a solid phase starts to melt into a liquid phase.

Meanwhile, in the present invention, "polymer" means an oligomer and / or a polymer obtained by polymerizing a compound containing a monomer or a reactive group capable of being polymerized. ).

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

The present invention provides a packaging tray panel including a low-melting polyester resin fiber layer.

In one embodiment, a packaging tray panel is provided, that is, the packaging tray panel of the present invention includes a fiber layer mixed with a first polyester resin fiber and a second polyester resin fiber, wherein a melting point of the first polyester resin fiber It is 180 ° C to 250 ° C or a softening point is 100 ° C to 150 ° C. The melting point of the second polyester resin fiber is higher than 250 ° C.

In the fiber layer, the first polyester resin fiber is a fiber formed of a polyester resin having a melting point of 180 ° C to 250 ° C or a softening point of 100 ° C to 150 ° C. Relatively speaking, it is also called low-melting polyester resin fiber. In addition, the second polyester resin fiber is a polyester resin fiber having a melting point higher than 250 ° C, and is also referred to as a high-melting polyester resin fiber.

The fiber layer has a form in which a first polyester resin fiber and a second polyester resin fiber are mixed. The mixing ratio of the first polyester resin fiber and the second polyester resin fiber can be controlled to a weight ratio of 1: 9 to 9: 1. Depending on the situation, the range of the mixing ratio can be 1: 9 to 7: 3 or 1: 9 to 5: 5. By using a low-melting point and a high-melting point polyester resin, the strength of the fiber can be improved while improving the adhesion between fibers. Specifically, the content of the polyester resin fibers having a low melting point may be controlled to be equal to or relatively lower than the content of the polyester resin fibers having a high melting point. For example, the melting point of the high melting point polyester resin is higher than 250 ° C, preferably at In the range of 251 ° C to 260 ° C. The above-mentioned high-melting polyester resin can be obtained commercially. For example, a product of Huiwei Shi Co., Ltd. (product name: Semi-dull chip (SD)) can be used.

Specifically, the shape, thickness, and laminated structure of the fiber layer are not particularly limited, but, for example, the fiber layer is in a form in which the fibers forming the fiber layer are partially welded. The form of partial fusion between fibers is a form in which heat and / or pressure is applied in the process of forming a fiber layer by thermoforming, and in the process, partial fusion is formed between the fibers. Since the fiber layer of the present invention contains low-temperature-weldable fibers prepared from a polyester resin having a low melting point, it is possible to form a partially-fused shape between fibers by low-temperature molding.

In still another example, the fiber layer may further include a functional additive component as necessary. For example, a small amount of a flame retardant, a thickener, an inorganic filler, or the like may be added as the functional additive component.

As an example, the packaging tray panel of the present invention does not include glass fiber. Glass fibers include glass flakes and other powdered glass. Specifically, in the present invention, excluding glass fiber means excluding glass fiber by 1% by weight or less, and actually means not including glass fiber. Therefore, the packaging tray panel of the present invention does not generate glass dust during operation and can improve operation efficiency.

In still another embodiment, the packaging tray panel satisfies the following conditions: the noise reduction coefficient measured according to KS F 2805 is 0.4 NRC or more, and / or the transmission loss value measured according to KS F 2080 is 10 dB or more.

For example, the noise reduction coefficient can be in the range of 0.4NRC to 1NRC or 0.4NRC to 0.6NRC, and the noise reduction rate can be in the range of 10dB to 30dB or 15dB to 25dB. As such, the packaging tray panel of the present invention can achieve both sound absorption and sound insulation at an excellent level, so that it can effectively sound and / or absorb the noise inside and outside the vehicle.

In one embodiment, the packaging tray panel satisfies the following general formula 1.

In the above general formula 1, W ₁ refers to the bending strength before exposing the built-in material for a packaging tray panel to ultraviolet light under the conditions based on KS M ISO 11507, and W ₂ refers to the packaging under the conditions based on KS M ISO 11507. The flexural strength of the built-in material for the pallet panel after 30 days of exposure to ultraviolet light. The bending strength is fixed to 100 mm according to ASTM D 790. The strength (N / cm ² ) measured during the period when the bending load was applied at a rate of 10% relative to the initial test piece deformation was 10%.

Specifically, the above general formula 1 may show a bending strength change rate of the built-in material for a packaging tray panel of the present invention. This can be measured by measuring the initial flexural strength (W ₁ ) before the built-in material for the packaging tray panel is exposed to the outside and the flexural strength change rate at the later flexural strength (W ₂ ) as the flexural strength after 30 days of exposure to the outside. To confirm.

Specifically, the bending strength change rate represented by the general formula 1 of the built-in material for a packaging tray panel of the present invention may be 8% or less, 0.01% to 7.5%, 0.1% to 6%, 0.4% to 5%, or 0.5%. To 2%. When the bending strength change rate is within the above range, even if the built-in material for the packaging tray panel is exposed to the outside for a long period of time, it can maintain a stable form and prevent a decrease in durability.

The packaging tray panel of the present invention achieves excellent tensile strength and / or low flammability. As an example, the tensile strength is 10 MPa to 150 MPa based on ASTM D 638. For example, the tensile strength may be in a range of 10 MPa to 130 MPa, 30 MPa to 100 MPa, or 40 MPa to 100 MPa. It can achieve excellent durability by satisfying the tensile strength in the above range.

The flame retardancy may be 80 or less based on KS M ISO 9772. Specifically, the packaging tray panel of the present invention has flame retardant to non-combustible characteristics, thereby reducing the risk of fire in the future.

The packaging tray panel of the present invention has excellent durability. Specifically, the above-mentioned packaging tray panel is subjected to a harsh condition including a step of being placed under a temperature condition of 90 ± 1 ° C for 24 hours, and a step of being placed under a temperature condition of 50 ± 1 ° C and a relative humidity of 90% for 24 hours Can satisfy the following general formula 2.

In the above general formula 2, V ₀ is the volume (mm ³ ) of the packaging tray panel before being exposed to severe conditions, and V ₁ is the volume (mm ³ ) of the packaging tray panel after being exposed to severe conditions.

Specifically, the dimensional change rate of the prepared packaging tray panel sample before and after passing through harsh conditions is measured. This is a measurement value corresponding to a long-term dimensional change rate after the packaging tray panel is applied to a vehicle. For example, the volume may be a value calculated by multiplying each of the length, width, and thickness of the packaging tray panel. For example, the mathematical expression 1: the dimensional change rate of | V ₁ -V ₀ | / V ₀ × 100 may be in a range of 0.01% to 5%, 0.01% to 3%, or 0.01% to 1%. It can be seen that even if the value of the mathematical expression 1 in the above range is satisfied, the shape does not change even if the packaging tray panel of the present invention is used for a long period of time in an environment with a severe temperature change.

At this time, when the above formula 1 is more than 5%, it means that the packaging tray panel can easily peel, swell, sag, change color, or even deform.

Hereinafter, the first polyester resin fiber forming the fiber layer of the present invention will be specifically described.

The first polyester resin fiber includes a repeating unit represented by the following Chemical Formula 1 and Chemical Formula 2, and is formed of a polyester resin having a melting point of 180 ° C to 250 ° C or a softening point of 100 ° C to 150 ° C.

In the above Chemical Formulas 1 and 2, m and n are mole fractions representing repeating units included in the low-melting polyester resin, and m is based on m + n = 1, and n is 0.05 to 0.5.

The first polyester resin fiber is characterized by being a fiber of a low-melting polyester resin. The low-melting polyester resin may have a structure including a repeating unit represented by Chemical Formula 1 and Chemical Formula 2. The repeating unit represented by the above-mentioned chemical formula 1 represents a repeating unit of polyethylene terephthalate (PET), and the repeating unit represented by the chemical formula 2 is performed on a package containing polyethylene terephthalate (PET) The repeating unit of the polyester resin has an improved tearing function. Specifically, in the repeating unit represented by the above Chemical Formula 2, a methyl group (-CH ₃ ) is included as a side chain in a propylene chain combined with terephthalate to secure a space so that the main chain of the polymerized resin Rotation can be performed to induce an increase in the degree of freedom of the main chain and a decrease in the crystallinity of the resin, thereby reducing the melting point (Tm). This may have the same effect as the conventional case where isophthalic acid (IPA) containing an asymmetric aromatic ring is used to lower the melting point (Tm) of the crystalline polyester resin.

At this time, the low-melting polyester resin may include, as the main repeating unit, a repeating unit of chemical formula 2 that lowers the melting point (Tm) of the resin together with the repeating unit of chemical formula 1 containing an ester repeating unit. Specifically, in the low-melting-point polyester resin of the present invention, when the mole fraction of all the resins is 1, 0.5 to 1 repeating units represented by Chemical Formula 1 and Chemical Formula 2 may be included. Contains 0.55 to 1; 0.6 to 1; 0.7 to 1; 0.8 to 1; 0.5 to 0.9; 0.5 to 0.85; 0.5 to 0.7; or 0.6 to 0.95.

In addition, in the case where the total number of repeating units represented by Chemical Formula 1 in the amount of the repeating unit represented by Chemical Formula 2 included in the low-melting polyester resin is 1, (m + n = 1) 0.05 to 0.5, preferably 0.05 to 0.4, 0.1 to 0.4, 0.15 to 0.35; or 0.2 to 0.3.

Meanwhile, the melting point (Tm) of the above low-melting polyester may be 180 ° C to 250 ° C or a melting point does not exist. Specifically, the above melting point (Tm) may be 180 ° C to 250 ° C; 185 ° C to 245 ° C; 190 ° C to 240 ° C; 180 ° C to 200 ° C; 200 ° C to 230 ° C or 195 ° C to 230 ° C or absent.

At the same time, the softening point of the above low-melting polyester may be 100 ° C to 150 ° C, specifically 100 ° C to 130 ° C, 118 ° C to 128 ° C; 120 ° C to 125 ° C; 121 ° C to 124 ° C; 124 ° C To 128 ° C or 119 ° C to 126 ° C.

Further, the low-melting polyester resin may have a glass transition temperature (Tg) of 50 ° C or higher. Preferably, the glass transition temperature may be 50 ° C to 80 ° C, more preferably 61 ° C to 69 ° C, 60 ° C to 65 ° C, 63 ° C to 67 ° C, 61 ° C to 63 ° C, 63 ° C to 65 ° C, 65 ° C to 67 ° C or 62 ° C to 67 ° C.

And, the low-melting resin may have an intrinsic viscosity (I.V) of 0.5 dl / g to 0.75 dl / g. Specifically, the intrinsic viscosity may be 0.6 dl / g to 0.65 dl / g; 0.65 dl / g to 0.70 dl / g; 0.64 dl / g to 0.69 dl / g; 0.65 dl / g to 0.68 dl / g; 0.67 dl / g g to 0.75 dl / g; 0.69 dl / g to 0.72 dl / g; 0.7 dl / g to 0.75 dl / g; or 0.63 dl / g to 0.67 dl / g.

The low-melting-point polyester resin of the present invention can adjust the melting point, softening point, and glass transition temperature to the above range by including the repeating unit represented by Chemical Formula 2, and the resin whose physical properties are adjusted to the above range can have excellent adhesiveness.

On the other hand, the low-melting polyester resin includes a repeating unit represented by Chemical Formula 1 and Chemical Formula 2 and may also include a repeating unit represented by Chemical Formula 3 below.

In Chemical Formula 3, X is 2-methacryl, vinyl or oxydiethylene, The number of moles of r as a repeating unit included in the low-melting polyester resin is 0.3 or less.

Preferably, in Chemical Formula 3, r may be 0.25 or less, 0.2 or less, 0.15 or less, or 0.1 or less.

In the present invention, by adjusting the repeating unit represented by Chemical Formula 3 contained in the low-melting polyester resin to the above-mentioned number range, not only the melting point of the polyester resin can be further reduced, but also the dispersion generated during polymerization can be significantly reduced. For example, the content of the cyclic compound with a polymerization degree of 2 to a polymerization degree of 3.

As an example, in the low-melting polyester resin of the present invention, since the content of the cyclic compound having a polymerization degree of 2 to a polymerization degree of 3 is significantly reduced, based on the total weight of the resin, it may contain 1% by weight. Based on the total weight, it may contain 0.5 weight percent or less, 0.4 weight percent or less, 0.3 weight percent or less, or 0.2 weight percent or less, or may not include the aforementioned cyclic compound.

In another example, any one or more of the first polyester resin fiber and the second polyester resin fiber may be shaped hollow fibers. In the present invention, the second polyester resin fibers may be all shaped hollow fibers, but include cases where the shaped hollow fibers are partially mixed. For example, the second polyester resin fiber is a profiled hollow fiber. In this case, 20% (v / v) to 85% (v / v) of all the second polyester resin fibers may be shaped hollow fibers. The profiled hollow fiber is formed by a hollow portion, a shape maintenance portion, and a volume control portion based on the cross-sectional shape. However, the volume control portion may have a shape protruding toward the fiber center. Preferably, the protruding end portion has a circular shape.

In the present invention, the cross-sectional structure of the profiled hollow fiber is divided into a hollow portion, a shape maintaining portion, and a volume control portion for explanation, but this is for convenience of explanation. In a cross-sectional structure of a profiled hollow fiber, there is a hollow portion that forms a hole along the length of the fiber inside, and includes a surrounding Morphological maintenance of the hollow part. In addition, the shape maintaining portion is formed with irregularities on the outer peripheral surface on the opposite side of the hollow portion based on the cross section. In such irregularities, the protruding portion is called a volume control portion. By using a hollow fiber with a special cross section, a network structure based on fiber formation is included, and this network structure can improve sound absorption performance by absorbing sound.

In one embodiment, the preparation process of the low-melting polyester resin is better explained as follows.

Provided is a method for preparing a low-melting polyester resin, including a step of performing an ester interchange reaction including a mixture of polyethylene terephthalate (PET) and 2-methyl-1,3-propanediol.

The method for producing the low-melting polyester resin of the present invention can be performed by including an aromatic dicarboxylic acid including phthalic acid, terephthalic acid, isophthalic acid, and the like; and Polyethylene glycol (EG), propylene glycol (PG), diethylene glycol (DEG), dipropylene glycol (DPG) and other diol compounds polymerized polyester polymer mixture After 2-methyl-1,3-propanediol is mixed with the mixture, it can be carried out by performing a transesterification reaction of the mixture according to a method generally used in the technical field.

As an example, a low-melting polyester resin can be prepared by mixing 2-methyl-1,3-propanediol in a polyethylene terephthalate oligomer (PET oligomer) and adding a transesterification catalyst After that, it can be prepared by performing a transesterification reaction under the temperature condition of 250 ± 10 ° C.

At this time, 5 to 50 mol parts of the aforementioned 2-methyl-1,3-propanediol may be mixed with 100 mol parts of polyethylene terephthalate as a polyester polymer. Preferably, relative to 100 mol parts of polyethylene terephthalate, it may be 5 mol parts to 40 mol parts; 10 mol parts to 30 mol parts; and 20 mol parts to 40 mol parts. Ear parts; 25 moles to 50 moles; or 30 moles to 50 moles. In the present invention, the content of the additive for preparing a low melting point resin can be adjusted to fall within the above range to prevent Only because the content of the additive is low and the melting point of the resin does not decrease sufficiently, or the crystallinity is increased again beyond the critical point where the crystallinity of the resin decreases due to the excessive amount of the additive.

In addition, the mixture to be subjected to the transesterification reaction includes polyethylene terephthalate and 2-methyl-1,3-propanediol, and may also include any one or more of isophthalic acid and diethylene glycol. Preferably, the mixture includes polyethylene terephthalate, 2-methyl-1,3-propanediol, and diethylene glycol, or may include polyethylene terephthalate (PET), 2 -Methyl-1,3-propanediol, diethylene glycol and isophthalic acid.

Here, the isophthalic acid may be contained in an amount of 30 mol parts or less based on 100 mol parts of polyethylene terephthalate. More preferably, it may contain 25 mol parts or less, 20 mol parts or less, 15 mol parts or less, or 10 mol parts or less with respect to 100 mol parts of polyethylene terephthalate. The content of the isophthalic acid includes a case where it contains 0.1 mol parts or more or 1 mol part or more or does not contain isophthalic acid. For example, isophthalic acid may be included in an amount of 0.5 to 0.001 mol.

Meanwhile, it may contain 1 to 20 mol parts of the above-mentioned diethylene glycol relative to 100 mol parts of polyethylene terephthalate, and preferably, to 100 mol parts of polyethylene terephthalate. Ethyl phthalate may contain 5 to 15 mol, 10 to 15 mol, 15 to 20 mol, 12 to 18 mol, 13 mol parts to 17 mol parts, or 14 mol parts to 16 mol parts.

In the present invention, by adjusting the content of isophthalic acid to the above range, not only the production cost is reduced, but also the content of the cyclic compound having a degree of polymerization of 2 to a degree of polymerization of 3 in the prepared low-melting polyester resin is minimized. By adjusting the content of diethylene glycol within the above range, the melting point of the resin can be optimized, and the problem of changes over time caused during spinning can be prevented by suppressing a decrease in the glass transition temperature.

In one embodiment, the packaging tray panel of the present invention includes a resin foam layer, and may have a structure in which one or both sides of the resin foam layer are laminated with the aforementioned fiber layer. Specifically, the packaging tray The panel may have a structure including a polyester resin foamed layer and polyester resin fiber layers formed on both sides of the polyester resin foamed layer.

The polyester resin foamed layer may be in the form of a foamed plate or a foamed sheet. Specifically, the packaging tray panel has a structure in which polyester resin fiber layers are laminated on both sides of the polyester resin foamed sheet.

For example, according to ASTM D 790, the packaging tray panel of the present invention fixes the support span (Span) of the test piece to 100 mm, and applies flexural load at a speed of 5 mm / min. In the range. The packaging tray panel of the present invention provides excellent bending elasticity, so that when applied as a packaging tray panel, it can prevent sagging and impart excellent durability.

For example, the polyester resin foamed layer is a polyethylene terephthalate foamed sheet, and the fiber layer may be polyethylene terephthalate fiber. Various components or all of the components constituting the laminate are formed of a polyterephthalic resin, thereby improving interlayer adhesion, and environmentally, the regeneration of the resin is easy.

In addition, the mass per unit area of the packaging tray panel may be in a range of 500 g / m ² to 1100 g / m ² on average. For example, the mass per unit area of the packaging tray panel may be 550 g / m ² to 1000 g / m ² , 600 g / m ² to 1000 to 1100 g / m ^2, or 800 g / m ² to 900 to 1100 g / m ² . It can be seen that the weight of the packaging tray panel of the present invention can be confirmed by satisfying the mass per unit area in the above range.

The packaging tray panel of the present invention can utilize various components or decorations in an automobile. Preferably, the packaging tray panel can be applied to a floor pad or a car foot pad. For example, when the built-in material of the present invention is used as a floor inner pad of an automobile, it can be effectively protected from an externally applied shock by being provided in a lower part of an engine, a transmission, or a cooling fan.

In addition, the present invention provides the aforementioned method for manufacturing a packaging tray panel.

As an example, the method for preparing a packaging tray panel includes a step of thermoforming a fiber layer including a first polyester resin fiber and a second polyester resin fiber in a temperature range of 80 ° C to 200 ° C. The melting point of the ester resin fiber is 180 ° C to 250 ° C or the softening point is 100 ° C to 150 ° C. The melting point of the second polyester resin fiber is 255 ° C or higher.

The fiber layer has a form in which a first polyester resin fiber and a second polyester resin fiber are mixed. The mixing ratio of the first polyester resin fiber and the second polyester resin fiber may be mixed in a weight ratio of 1: 9 to 9: 1. Depending on the situation, the mixing ratio can be in the range of 1: 9 to 7: 3 or 1: 9 to 5: 5. Low-melting and high-melting polyester resins can be used to increase the cohesiveness between fibers while enhancing strength. Preferably, the content of the polyester resin fibers having a low melting point may be controlled to be equal to or relatively lower than the content of the polyester resin fibers having a high melting point. For example, the high-melting point polyester resin has a melting point higher than 250 ° C, and may preferably be in the range of 251 ° C to 260 ° C. The above-mentioned high-melting polyester resin can be obtained commercially. For example, a product of Huiwei Shi Co., Ltd. (product name: Semi-dull chip (SD)) can be used.

The packaging tray panel prepared by the above method satisfies the conditions of the following general formula 1. The content of Formula 1 is as described above.

In the above general formula 1, W ₁ refers to the bending strength before exposing the built-in material for a packaging tray panel to ultraviolet light under the conditions based on KS M ISO 11507, and W ₂ refers to the packaging under the conditions based on KS M ISO 11507. The flexural strength of the built-in material for the pallet panel after 30 days of exposure to ultraviolet light. The bending strength is fixed to 100 mm according to ASTM D 790. The strength (N / cm ² ) measured during the period when the bending load was applied at a rate of 10% relative to the initial test piece deformation was 10%.

In addition, the packaging tray panel prepared by the above method satisfies the physical properties that the noise reduction coefficient (NRC) measured according to KS F 2805 is 0.4 NRC or more and / or the transmission loss value measured according to KS F 2080 is 10 dB or more ( Sound insulation). The contents related to the noise reduction coefficient and sound insulation are as described above.

Preferably, the first polyester resin fiber includes a repeating unit represented by the following Chemical Formula 1 and Chemical Formula 2.

In Chemical Formula 1 and Chemical Formula 2, m and n are mole fractions showing repeating units included in the low-melting polyester resin, m + n = 1 as a reference, and n is 0.05 to 0.5.

In the thermoforming step, control can be performed within a range in which the low-melting polyester resin as the first polyester resin fiber is partially melted. For example, the thermoforming step may be performed in a range of 100 ° C to 150 ° C. And, in the thermoforming step, a pressure higher than atmospheric pressure is applied. In the state where heat and pressure are applied at the same time, it can be molded in a desired form. The pressure range to be applied is not particularly limited, and for example, it may be in the range of 1.5 to 10 atm, and 2 to 5 atm.

In one embodiment, after the thermoforming step, the method may further include a step of sequentially laminating the first polyester resin fiber layer; the polyester resin foam layer; and the second polyester resin fiber layer. In the present invention Introducing a polyester resin foam layer can achieve sound insulation and enhanced strength. The polyester resin foam may be in the form of a plate or a sheet.

According to circumstances, before the thermoforming step, a step of laminating a first polyester resin fiber layer, a polyester resin foam layer, and a second polyester resin fiber layer to form a laminate may be included in this order. In this case, in the thermoforming step, a laminated body composed of a first polyester resin fiber layer; a polyester resin foamed layer; and a second polyester resin fiber layer is subjected to thermoforming to be processed into a desired form.

In the present invention, a structure in which a first polyester resin fiber layer; a polyester resin foamed layer; and a second polyester resin fiber layer are sequentially stacked is disclosed. If it is not excluded that the polyester resin foamed layer is exposed to the structure of the outer layer, in this case, the sound absorption may be reduced. The first polyester resin fiber layer and the second polyester resin fiber layer correspond to the aforementioned polyester resin fiber layer. The polyester resin foamed layer is also as described above.

For example, each of the first polyester resin fiber layer, the second polyester resin fiber layer, and the polyester resin foam layer may be formed of a polyterephthalic resin.

Hereinafter, the present invention will be described in more detail based on examples and experimental examples.

However, the following examples and experimental examples are only for illustrating the present invention, and the content of the present invention is not limited to the following examples and experimental examples.

Preparation Examples 1 to 25: Preparation of low-melting polyester resin fibers

In the ester reaction tank, terephthalic acid (TPA) and isophthalic acid as the acid component are mixed according to the molar content ratio shown in Table 1 below; 2-methyl-1,3- as the alcohol component Propylene glycol (MPD), ethylene glycol, and diethylene glycol are added to a common esterification catalyst to perform an ester reaction at a temperature of 250 ± 5 ° C. If the esterification reaction rate reaches about 96%, the esterification reaction is terminated, and a polycondensation reaction catalyst is added to perform the polycondensation reaction so that the final temperature and vacuum pressure in the reaction tank are 280 ± 5 ℃ and 0.1mmHg. After the viscosity of the resin is converted by using the mixer torque, if the target viscosity is reached, the polycondensation is terminated, and the viscosity of the resin can be adjusted in this way.

The pressure is gradually broken and pressurized, so that it is discharged to the outside of the reactor and cooled, cut in the form of pellets, measured the physical properties of the resin, and composite spinning the obtained resin in the form of a sheath-core The first polyester resin fiber was prepared as a low-melting resin fiber by passing the resin prepared above through a sheath portion and ordinary polyethylene terephthalate through a core portion.

The content of the components added according to each Example is shown in Table 1 below.

Experimental example 1.

The physical properties of the samples prepared in Preparation Examples 1 to 25 were evaluated in accordance with the following items. The evaluation results are shown in Table 2 below.

(1) Determination of the content of cyclic compounds

10 mg of a polyester resin was taken, dissolved in a trifluoroacetic acid (TFA) solvent, and injected into a Pyrex glass tube having a diameter of 5 mm and a length of 20 cm so that the height was about 5 cm. The ¹ H-NMR spectrum was measured by a nuclear magnetic resonance spectrometer (Nuclear Magnetic Resonance, NMR, Bruker). The content of the cyclic compound having a degree of polymerization of 2 to a degree of polymerization of 3 remaining in the low-melting resin was derived from the measured results.

(2) Determination of softening temperature, melting point (Tm) and glass transition temperature (Tg)

A differential scanning calorimeter (Perkin Elmer, DSC-7) was used to measure the melting point and glass transition temperature of the low-melting polyester resin. When the melting point was measured, no heat absorption peak was observed. A dynamic thermomechanical analyzer (DMA-7, Perkin Elmer) measures the softening dynamics in TMA mode.

(3) Determination of intrinsic viscosity (I.V) and melt viscosity

After a solution of phenol and tetrachloroethane mixed at a weight ratio of 1: 1, the polyester resin was dissolved at a concentration of 0.5% by weight, and then the inherent viscosity (IV ). Then, the melt viscosity is measured by a usual method.

According to the above Table 2, in the resin forming the fiber layer of the packaging tray panel of the present invention, the content of the cyclic compound is 1% by weight or less, preferably, it is in the range of 0% by weight to 0.86% by weight. In addition, it was found that the resin has a melting point of 180 ° C to 250 ° C or a softening point in a range of 100 ° C to 150 ° C. Intrinsic viscosity (I.V) is 0.5dl / g to 0.75dl / g, preferably, 0.55 Within the range of dl / g to 0.6 dl / g. In addition, the glass transition temperature is 50 ° C to 80 ° C, and preferably it is in the range of 57 ° C to 77 ° C.

Example 1 to Example 25: Preparation of fiber layer

The first polyester resin fiber prepared in Preparation Examples 1 to 25 and the second polyester resin fiber having a polyester resin having a melting point of 255 ° C. or higher were mixed, and simultaneously performed at 130 ° C. by applying punching. Thermoforming to form a fibrous layer.

The second polyester resin fiber was obtained in the same manner as in Production Example 1 by obtaining a product (Product Name: Semi-dull chip (SD)) of Huvis Co., Ltd.

The mixing ratio of the first polyester resin fiber and the second polyester resin fiber is shown in Table 3 below based on parts by weight.

Experimental example 2.

For the samples of Examples 1 to 5, the flexural strength (W ₁ ) before exposure to ultraviolet rays under the conditions of KS M ISO 11507 was measured. Then, under the same conditions, this sample was exposed to ultraviolet rays, and the bending strength (W ₂ ) was measured at a time point after 30 days had passed.

Bending strength: The value measured when the support span (Span) of the built-in material test strip for packaging tray panels was fixed at 100 mm and the bending load was applied at a rate of 5 mm / min. Compared to the initial test piece deformation according to ASTM D 790. (N / cm ² ).

The change rate of the measured flexural strength was calculated, as shown in Table 4 below.

Referring to Table 4 above, in a UV-exposed environment, the built-in material for the packaging tray panel of the example minimizes the change in flexural strength, thereby confirming excellent durability.

Experimental example 3.

In the fiber layer sample prepared in Example 1, the basis weight, bending stiffness (stiffness), and bending strength were measured.

The flexural modulus and flexural strength were measured according to ASTM D 790. The values obtained when the support span (Span) of the test piece was fixed at 100 mm and the bending load was applied at a speed of 5 mm / min are shown in Table 5 below.

In the same manner as in Table 5, the basis weight measurement was performed on the samples of Examples 2 to 25, and it was confirmed that the basis weight of all the samples was 1000 g / m ² or less.

In addition, as a result of measuring the flexural modulus of the samples of Examples 2 to 25, it was confirmed that the samples were within a range of ± 10% relative to the case of Example 1.

Experimental example 4: Evaluation of dimensional change rate

An appropriate amount of Examples 11 to 13 was subjected to a dimensional change rate measurement experiment. Preferably, the vehicle built-in material prepared as above is subjected to a step of being left for 24 hours under a temperature condition of 90 ± 1 ° C; and being left for 24 hours under a temperature condition of 50 ± 1 ° C and a relative humidity of 90% After the harsh conditions of the step, the dimensional change rate was measured by the following mathematical formula 1. The results are shown in Table 6 below.

Mathematical formula 1: | V ₁ -V ₀ | / V ₀ × 100

In the above-mentioned mathematical formula 1, V ₀ is the volume (mm ³ ) of the built-in material for a vehicle before being exposed to severe conditions, and V ₁ is the volume (mm ³ ) of the built-in material for a vehicle after being exposed to severe conditions.

Referring to Table 6 above, in the case of the packaging tray panel of the present invention, it was confirmed that a low dimensional change rate of 0.5% or less was displayed. From this, it turns out that the vehicle built-in material of this invention is excellent in durability.

Experimental example 5: Measurement of sound absorption and sound insulation performance

For the samples of Examples 16 to 18, the noise reduction coefficient and the noise reduction rate were measured. The measurement method is described below, and the results are shown in Table 7 below.

(1) Measurement of noise reduction coefficient

The KS F 2805 reverberation chamber method was used to measure the sound absorption rate from 0 to 10000 Hz, and the noise reduction coefficient (NRC) value was calculated. The noise reduction coefficients represent average values of noise reduction coefficients at 250 Hz, 500 Hz, 1000 Hz, and 2000 Hz.

(2) Measurement of noise reduction rate

The Apamat measuring device based on KS F 2862 was used to obtain the transmission loss value at a frequency of 1 Hz to 8000 Hz. For comparison, transmission loss values at 8000 Hz were compared.

Referring to Table 7, it can be seen that both the noise reduction coefficient and the noise reduction rate of the fiber layer of the present invention are excellent.

Experimental example 6: Evaluation of tensile strength and flammability

The samples of Examples 1 to 25 were evaluated for tensile strength and flammability. The tensile strength was evaluated based on ASTM D 638, and the flammability was evaluated in accordance with KS M ISO 9772.

As a result of the evaluation, it was confirmed that the samples of Examples 1 to 25 had a tensile strength of 70 MPa or more and a flammability of 70 or less.

Examples 26 to 28

The fiber layers of Examples 6 to 8 were laminated on both sides of a polyethylene terephthalate resin foamed sheet. Specifically, the polyethylene terephthalate resin foamed sheet is prepared by the following procedure.

First, 100 parts by weight of a polyethylene terephthalate resin is dried at a temperature of 130 ° C to remove water. In a first extruder, the polyethylene terephthalate resin is removed from the water. , Based on 100 parts by weight of a polyethylene terephthalate resin that removes water, 1 part by weight of pyromellitic dianhydride, 1 part by weight of talc, and 0.1 part by weight of Irganox (IRG 1010), The resin was heated to 280 ° C to prepare a molten resin. Then, in a first extruder, carbon dioxide gas and pentane as a foaming agent were mixed at a ratio of 5: 5, and 5 parts by weight of the polyethylene terephthalate resin was added based on 100 parts by weight, and A polyester resin foamed layer was prepared by extrusion foaming. The prepared polyester resin foamed layer had a density of about 300 kg / m ³ , a thickness of about 2 mm, and a basis weight of about 600 g / m ² .

At this time, the total thickness of the prepared laminate was 8 mm, and the mass per unit area was adjusted as shown in Table 8 below.

Referring to Table 8, it can be seen that the mass per unit area is in the range of 1500 g / m ² to 2000 g / m ² .

Claims (7)

A packaging tray panel includes a fiber layer mixed with a first polyester resin fiber and a second polyester resin fiber. The first polyester resin fiber has a melting point of 180 ° C to 250 ° C or a softening point of 100 ° C. To 150 ° C, the melting point of the second polyester resin fiber is higher than 250 ° C, wherein the mixing ratio of the first polyester resin fiber and the second polyester resin fiber forming the fiber layer is in a weight ratio of 1: 9 to In the range of 9: 1, the fiber layer is in a state of being partially welded between the fibers forming the fiber layer, and a resin forming the first polyester resin fiber further includes a resin represented by the following Chemical Formula 3. Any one or more of the repeating units: Here, X is a 2-methacryl group, a vinyl group, or an oxydiethylene group, and r is a mole fraction of 0.3 or less as a repeating unit included in the resin which is a low-melting polyester resin. According to the packaging tray panel described in item 1 of the scope of patent application, the noise reduction coefficient measured according to KS F 2805 is 0.4NRC or more, and the transmission loss value measured according to KS F 2080 is 10dB or more. The packaging tray panel according to item 1 of the scope of patent application, which satisfies the following general formula 1: Among them, W ₁ refers to the bending strength before the built-in materials for packaging tray panels are exposed to ultraviolet light under the conditions of KS M ISO 11507, and W ₂ refers to the built-in materials for packaging tray panels under the conditions of KS M ISO 11507. The flexural strength of the material after 30 days of exposure to ultraviolet light. The flexural strength refers to the support span (Span) of the built-in material test piece for the packaging tray panel is fixed to 100 mm according to ASTM D 790, and the speed is 5 mm / min. While the bending load was applied, the strength (N / cm ² ) measured when the initial test piece was deformed by 10%. The packaging tray panel according to item 1 of the scope of patent application, which includes a step of being left for 24 hours under a temperature condition of 90 ± 1 ° C; and a temperature condition of 50 ± 1 ° C and a relative humidity of 90% After the harsh conditions of the step of standing for 24 hours, the following general formula 2 is satisfied: Among them, V ₀ is the volume (mm ³ ) of the packaging tray panel before being exposed to severe conditions, and V ₁ is the volume (mm ³ ) of the packaging tray panel after being exposed to severe conditions. The packaging tray panel according to item 1 of the scope of patent application, wherein the resin forming the first polyester resin fiber includes a repeating unit represented by the following Chemical Formula 1 and Chemical Formula 2: Chemical Formula 1 Here, m and n are moles representing repeating units included in the resin which is a low-melting polyester resin, and m is based on m + n = 1, and n is 0.05 to 0.5. A method for preparing a packaging tray panel includes the steps of: mixing a first polyester resin fiber and 90 parts by weight to 10 parts by weight in a temperature range of 80 ° C to 200 ° C. A step of thermoforming a fiber layer of a second polyester resin fiber, wherein the first polyester resin fiber has a melting point of 180 ° C to 250 ° C or a softening point of 100 ° C to 150 ° C, and the second polyester resin fiber The melting point of the fiber is 255 ° C or higher, and a resin forming the first polyester resin fiber further includes any one or more of the repeating units represented by the following chemical formula 3: Among them, X is a 2-methacryl group, a vinyl group, or an oxydiethylene group, and r is 0.3 or less as a molar unit of a repeating unit included in the resin which is a low-melting polyester resin. The method for preparing a packaging tray panel according to item 6 of the patent application scope, which satisfies the following general formula 1: Among them, W ₁ refers to the bending strength before exposing the packaging tray panel to UV under the conditions based on KS M ISO 11507, and W ₂ refers to the exposing the packaging pallet panel to UV under the conditions based on KS M ISO 11507. The flexural strength after the day is based on ASTM D 790. The span of the support tray panel test piece is fixed to 100mm, and the bending load is applied at a speed of 5mm / min compared to the initial test piece. Strength (N / cm ² ) measured at 10% deformation.