KR102242987B1 - Thermoplastic polyolefin sheet being capable of displaying and touch-sensing - Google Patents

Abstract

The present invention relates to a TPO sheet capable of display and touch sensing, and more particularly, to implement an interior effect by imparting color to a TPO sheet used as a skin material of automobile interior parts, and to transmit light emitted to the outside. The present invention relates to a TPO sheet that has light transmittance so that when it is bonded to an upper portion of a display panel, it is possible to display and sense a touch.

Description

TPO sheet capable of display and touch sensing {Thermoplastic polyolefin sheet being capable of displaying and touch-sensing}

The present invention relates to a TPO sheet capable of display and touch sensing, and more particularly, to implement an interior effect by imparting a color to a TPO sheet used as a skin material of automobile interior parts, and to transmit the emitted light to the outside. The present invention relates to a TPO sheet that has light transmittance so that when it is bonded to an upper portion of a display panel, it is possible to display and sense a touch.

Conventionally, PVC, PVC/ABS ALLOY extruded sheets, or calendering sheets have been widely used as skin materials for automobile interior parts, such as instrument panels, door trim panels, and headlining. However, in recent years, there is a trend of being rapidly replaced by a sheet of thermoplastic polyolefin (hereinafter referred to as'TPO'), which is advantageous in terms of environmental friendliness, light weight, and odor.

On the other hand, in recent years, the skin material of automobile interior parts has been proposed an interior material to which lighting technology is applied to realize an emotional interior effect.

For example, a case in which a light emitter or the like is provided in a garnish to provide a luxurious lighting effect in a vehicle interior with light emitted from the light emitter has been previously applied as Korean Patent Application Publication No. 10-2010-0044443.

However, the prior art was able to implement the lighting effect, but there is a disadvantage in that the hard plastic components constituting the garnish give a cold feeling.

In other words, the components of the garnish have a soft and warm feeling and a difference, so it is difficult to implement the emotional quality.

Patent document KR 10-2010-0044443 A (2010.04.30)

The present invention was conceived to solve the above-described problems, and the TPO sheet used as a skin material for automobile interior parts is given a color to realize an interior effect and transmittance so that the emitted light can be transmitted to the outside is imparted to the top of the display panel. The purpose of this is to provide a TPO sheet capable of displaying and sensing a touch when bonded to.

In order to achieve the above object, the present invention provides a TPO sheet comprising 0.06-3% by weight of a pigment and having a transmittance of 2-20% as a TPO sheet.

The TPO sheet of the present invention has an effect of implementing an interior effect by having a color.

The TPO sheet of the present invention has a light-transmitting property so that the emitted light can be transmitted to the outside, so that when the TPO sheet is bonded to the top of the display panel, it is possible to display the display.

When the TPO sheet of the present invention is bonded to an upper portion of a display panel, touch sensing is possible.

Hereinafter, the present invention will be described in detail.

The present invention relates to a TPO sheet comprising 0.06-3% by weight of a pigment and having a transmittance of 2-20%.

The TPO sheet may be formed by using a TPO composite resin (A) alone, or may include 75-95 parts by weight of a TPO composite resin (A) and 10-30 parts by weight of a polyolefin resin (B).

In the present invention, the TPO composite resin (A) may be a composite resin formed by dispersing rubbery particles (a2) in a thermoplastic polyolefin matrix resin (a1).

The thermoplastic polyolefin-based matrix resin (a1) may be one or more selected from polypropylene and polyethylene, but preferably, it is preferable to include both polypropylene and polyethylene as the thermoplastic polyolefin-based matrix resin (a1).

The polypropylene is not particularly limited, but the use of homo-polypropylene is preferable because it has little odor and little change due to temperature or light.

The polyethylene is not particularly limited, but it is preferable to use a low-density polyethylene having soft hardness and excellent moldability.

The sum of the contents of the polypropylene and polyethylene may be included in 6-25% by weight in the TPO composite resin (A), preferably the content of the polypropylene is 5-20% by weight, the content of the polyethylene is 1-5 It may be included in weight percent.

If the polypropylene content is less than the above range, shape retention is not good when vacuum forming using a TPO sheet, and if it exceeds the above range, processing into a TPO sheet is difficult, so it is preferable to be included within the above range.

When the content of the polyethylene is less than the above range, the moldability is not good, and when the content of the polyethylene exceeds the above range, the physical properties of the TPO sheet may be deteriorated.

The rubbery particles (a2) are specifically, 1 selected from ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-octene rubber, ethylene-butene rubber, ethylene-butadiene rubber, and styrene-ethylene-butadiene-styrene rubber. More than one species may be used, and may be included in 20-40% by weight in the TPO composite resin (A).

In addition, the TPO composite resin (A) may further include a filler (a3).

The filler (a3) may be at least one selected from carbon black, hard coal, heavy carbon, clay, talc, and silica, and may be included in 20-40% by weight in the TPO composite resin (A). When the content of the filler is less than the above range, the required strength cannot be obtained, and when the content of the filler exceeds the above range, elasticity decreases, so it is preferable to use it within the above range.

In addition, the TPO composite resin (A) may further include other additives (a4) such as a crosslinking agent, a flame retardant, and an anti-aging agent.

The TPO composite resin (A) may have a melt flow index (MFR) of 10-30g/10min (230°C, 10kg), preferably 15-25g/10min (230°C, 10kg). If it is less than the above range, the flowability is too low and processability is not good, and if it exceeds the above range, the flowability of the resulting composition is high and the melt strength is insufficient, so it is preferable to use within the above range.

In addition, the TPO composite resin (A) may have a shore A hardness of 80-95, preferably 85-90. If it is less than the above range, scratch resistance may decrease due to a tear phenomenon, and if it exceeds the above range, impact strength may decrease. In the present invention, when the TPO sheet is formed including the TPO composite resin (A) and the polyolefin resin (B), the TPO composite resin (A) may be included in 75-95 parts by weight, preferably 80-90 parts by weight. have. If it is less than the above range, it is preferable to use it within the above range because it is weak against bursting or tearing of the sheet during molding using the TPO sheet, embossing is not implemented, and the performance of the elastomer is insufficient.

The polyolefin resin (B) is not particularly limited as long as it is a polyolefin resin used for conventional automobile interior and exterior materials, but may be specifically polyethylene, polypropylene resin, and the like, and such a polyolefin may be in the form of a polymer or an oligomer polymer, or an elastomer-like rubber. It may be in the form, and a mixture may be used as a combination thereof.

In the present invention, linear low-density polyethylene obtained by copolymerizing ethylene with at least one comonomer selected from butylene, hexene and octene may be used as the polyolefin resin (B). Since the linear low-density polyethylene has a narrower molecular weight distribution than that of low-density polyethylene (LDPE) resin, since it has no long side chains and only short side chains, it has higher crystallinity than low-density polyethylene resins in terms of molecular structure and has a higher melting point so that the melting temperature range is advantageous. It has the advantage of being able to provide a wide temperature range for the preheating temperature. In addition, not only has good stiffness and resistance to stress cracking, but also has high tear resistance and relatively high surface hardness, so that a sheet with good gloss can be obtained.

In addition, the polyolefin resin (B) may have a melt flow index (MFR) of 0.5-5g/10min (190°C, 2.16kg), preferably 0.8-2g/10min (190°C, 2.16kg). If it is less than the above range, the flowability is low and the molding processability is deteriorated, and if it exceeds the above range, the processability is lowered, so it is preferable to use it within the above range.

The polyolefin resin (B) may be included in an amount of 10-30 parts by weight, preferably 15-25 parts by weight. If it is less than the above range, the elongation decreases, and if it exceeds the above range, whitening occurs during molding using a TPO sheet, so it is preferable to use it within the above range.

The TPO sheet of the present invention is characterized in that it contains 0.06-3% by weight of a pigment.

Specifically, it is within the above range regardless of the type of pigment, but the content range having light transmittance while realizing the color according to the color of the pigment is different.

For example, in the case of a black pigment, it must be included in an amount of 0.06-0.2% by weight to realize a color and have light transmittance, in the case of a beige pigment, more than 0.4% by weight and less than 1.0% by weight, and in the case of a red pigment, 0.3-1.0 weight It is preferably included in %.

If the pigment content range in the TPO sheet is less than the above range 　, the color may be difficult to implement and the lower structure may be exposed as it is due to low hiding power.If it exceeds the above range, the color of the TPO sheet is good and the hiding power is excellent. Since it is difficult to implement a display because it is not good, it is preferable to be included within the above range.

When the TPO sheet of the present invention includes a TPO composite resin (A) and a polyolefin resin (B), it may further include a polyolefin-based elastomer (C) for reinforcing impact resistance.

The polyolefin-based elastomer (C) may be at least one selected from ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-butene rubber, and ethylene-octene rubber.

In particular, the grade of the ethylene-octene rubber is divided according to the octene content.In the present invention, the ethylene-octene rubber is octene in an amount of 40-50% by weight, more preferably 40- It is preferable to use what is contained in 45% by weight. If it is less than the above range, the molding processability is deteriorated, and if it exceeds the above range, the soft texture of the product is improved, but the calendering processability is poor, so it is recommended to use an ethylene-octene rubber containing octene within the above range. good.

The ethylene-octene rubber may have a melt flow index (MFR) of 1-5g/10min (190°C, 2.16kg), preferably 3-4g/10min (190°C, 2.16kg). If it is less than the above range, moldability is not good, and if it exceeds the above range, physical properties may be deteriorated, and it is preferable to be included within the above range.

The polyolefin-based elastic body (C) may be included in an amount of 10-30 parts by weight, preferably 15-25 parts by weight. If it is less than the above range, the stiffness reinforcing effect is not sufficient, and if it exceeds the above range, it is preferable to use it within the above range because sagging is excessive and wrinkles occur during molding.

The TPO sheet of the present invention may further include commonly known additives as necessary to adjust physical properties, and for example, plasticizers, inorganic fillers, light stabilizers, heat stabilizers, antioxidants, lubricants, flame retardants, antibacterial agents and hydrolysis resistant agents It may further include one or more additives selected from the group consisting of.

The content of the additive may be used within a content range that does not affect the physical properties of the skin sheet of automobile interior parts.

The TPO sheet of the present invention may be T-die extrusion molding, calender molding, or blow molding.

T-die extrusion molding is a molding method in which a thermoplastic plastic material is heated and melted on the surface of a substrate using an extruder to make it fluid, and then extruded from the T-die into a sheet form and continuously compressed. Blow molding heats the thermoplastic resin. It is a molding method to make a sheet after melting and continuously extruding in a tube shape in an extruder, and calendering is a molding method in which a sheet is continuously manufactured by rolling raw materials between two or more rolls rotating in opposite directions. .

Preferably, it is preferable to use calender molding excellent in productivity.

The TPO sheet of the present invention may have a thickness of 0.1-2mm, preferably 0.3-1.4mm. If it is less than the above range, the tactile feel is not good, and if it exceeds the above range, it is preferable to be within the above range because the light transmittance is poor and the display cannot be implemented and touch sensing is not possible.

The TPO sheet of the present invention may have a transmittance of 2-20%, 2-16% or 4-19%. If it is less than the above range, the color of the TPO sheet is good and the hiding power is excellent, but it is difficult to implement the display due to poor light transmission, and if it exceeds the above range, it is difficult to implement the color and the lower structure may be exposed as it is due to low hiding power. , It is preferable to use within the above range.

The TPO sheet of the present invention has an effect of implementing an interior effect by having a color.

The TPO sheet of the present invention has a light-transmitting property so that the emitted light can be transmitted to the outside, so that when the TPO sheet is bonded to the top of the display panel, it is possible to display the display.

When the TPO sheet of the present invention is bonded to an upper portion of a display panel, touch sensing is possible.

Hereinafter, preferred embodiments are presented to aid in the understanding of the present invention, but the following examples are only illustrative of the present invention, and it is obvious to those skilled in the art that various changes and modifications are possible within the scope and spirit of the present invention. It is natural that changes and modifications fall within the scope of the appended claims.

<Example>

1. Preparation of resin composition for TPO sheet

A resin composition for a TPO sheet according to the example was prepared using the composition shown in Table 1 below.

ingredient Example (parts by weight) TPO composite resin (A) 84 Polyolefin resin (B) 18 Polyolefin-based elastomer (C) 18 Heat stabilizer 1.1

The TPO composite resin (A) of the above example used a thermoplastic polyolefin elastomer having a melt flow index (MFR) of 20g/10min (230°C, 10kg) and a Shore A hardness of 88.

The polyolefin resin (B) of the above example was a linear low-density polyethylene having a melt flow index (MFR) of 0.5-5g/10min (190°C, 2.16kg).

Ethylene octene rubber (EOR) having a melt flow index (MFR) of 1-5g/10min (190°C, 2.16kg) was used as the polyolefin-based elastomer (C).

2. TPO sheet manufacturing

(Example) After mixing the pigment in the resin composition for the TPO sheet of the example of Table 1 at the concentration shown in Table 2 and melting it at a temperature of 160-230°C, the melted material was passed through a calender roll having a surface temperature of about 170°C. By passing through, a 0.6 mm thick TPO sheet was prepared.

As the pigment, beige, red, and black series were used.

(Comparative Example) A TPO sheet having a thickness of 0.6 mm was prepared through the same manufacturing process as above by mixing a pigment in the resin composition for a TPO sheet of the Example of Table 1 at the concentration shown in Table 3.

As the pigment, beige, red, and black series were used.

Beige
(weight%) Red
(weight%) Black
(weight%) Example 1 0.06 Example 2 0.08 Example 3 0.1 Example 4 0.2 Example 5 0.5 Example 6 0.6 Example 7 0.7 Example 8 1.0 Example 9 0.3 Example 10 0.4 Example 11 0.5 Example 12 0.6 Example 13 1.0

Beige
(weight%) Red
(weight%) Black
(weight%) Comparative Example 1 0.02 Comparative Example 2 0.04 Comparative Example 3 0.3 Comparative Example 4 0.4 Comparative Example 5 0.5 Comparative Example 6 1.0 Comparative Example 7 1.5 Comparative Example 8 2 Comparative Example 9 2.5 Comparative Example 10 0.3 Comparative Example 11 0.4 Comparative Example 12 1.5 Comparative Example 13 2.0 Comparative Example 14 2.5 Comparative Example 15 0.2 Comparative Example 16 1.5 Comparative Example 17 2.0 Comparative Example 18 2.5

Experimental Example 1. Measurement of transmittance of TPO sheet

The transmittance of the TPO sheet according to the concentration of the pigment was measured using the prepared TPO sheets of Examples and Comparative Examples, and the results are shown in Tables 4 and 5 below.

-The transmittance was measured using Haze-Gard II (Toyoseiki Co.).

Beige
(weight%) Red
(weight%) Black
(weight%) Transmittance
(%) Example 1 0.06 20.00 Example 2 0.08 14.50 Example 3 0.1 11.50 Example 4 0.2 2.80 Example 5 0.5 13.00 Example 6 0.6 10.50 Example 7 0.7 8.50 Example 8 1.0 2.50 Example 9 0.3 20.00 Example 10 0.4 13.00 Example 11 0.5 10.00 Example 12 0.6 7.00 Example 13 1.0 2.20

Beige
(weight%) Red
(weight%) Black
(weight%) Transmittance
(%) Comparative Example 1 0.02 35.00 Comparative Example 2 0.04 27.00 Comparative Example 3 0.3 0.50 Comparative Example 4 0.4 0.10 Comparative Example 5 0.5 0.30 Comparative Example 6 1.0 0.00 Comparative Example 7 1.5 0.00 Comparative Example 8 2 0.00 Comparative Example 9 2.5 0.00 Comparative Example 10 0.3 26.00 Comparative Example 11 0.4 21.00 Comparative Example 12 1.5 0.70 Comparative Example 13 2.0 0.15 Comparative Example 14 2.5 0.05 Comparative Example 15 0.2 28.00 Comparative Example 16 1.5 0.60 Comparative Example 17 2.0 0.20 Comparative Example 18 2.5 0.10

As confirmed in Tables 4 and 5, it can be seen that the lower the concentration of the pigment, the higher the transmittance.

More specifically, as shown in Table 4, when the pigment is beige-based, the concentration is 0.5-1% by weight, red-based, the concentration is 0.3-1% by weight, and when the black-based pigment is included in the concentration 0.06-0.2% by weight, the transmittance is 2 It can be seen that within -20%, it is possible to impart light transmittance while realizing color.

As shown in Table 5, if the pigment content range is less than the above range 　, the transmittance is too high to realize the color, and the lower structure may be exposed as it is due to low hiding power. It can be seen that although this has an excellent advantage, it may be difficult to implement a display because the transmittance is remarkably low.

Experimental Example 2. Measurement of whether touch sensing of TPO sheet is possible

(Example 3) After the composition of Example 3 was mixed and melted at a temperature of 160-230°C, the melted material was passed through calender rolls having a surface temperature of about 170°C to prepare a TPO sheet having a thickness of 0.6 mm. .

(Comparative Example 19) Using the same composition as in Example 3, a TPO sheet having a thickness of 2.5 mm was prepared through the same manufacturing process.

When the TPO sheets of Example 3 and Comparative Example 19 prepared above were used to measure whether or not touch sensing was possible when they were bonded to the top of the display panel, the results are shown in Table 6 below.

Example 3 Comparative Example 19 Thickness(mm) 0.6 2.5 Touch sensing possible impossible

As confirmed in Table 6, it can be seen that the thickness of the TPO sheet of Comparative Example 19 is too thick compared to Example 3, so that touch sensing is impossible when it is bonded to the top of the display panel.

Claims (25)

As a TPO sheet,
A resin composition comprising 75-95 parts by weight of a TPO composite resin (A), 10-30 parts by weight of a polyolefin resin (B), and 15-25 parts by weight of a polyolefin-based elastomer (C); And a pigment; including,
The pigment is one selected from the group consisting of a black-based pigment, a beige-based pigment, and a red-based pigment, and based on the total 100% by weight of the TPO sheet, the pigment is 0.08-0.1% by weight in the case of a black-based pigment, and a beige-based pigment. In the case of a pigment, 0.5-0.7% by weight, in the case of a red-based pigment, 0.4-0.6% by weight,
The TPO composite resin (A) is formed by dispersing rubbery particles (a2) in a thermoplastic polyolefin matrix resin (a1), based on the total 100% by weight of the TPO composite resin (A), 5-20 weight of polypropylene % And a thermoplastic polyolefin matrix resin (a1) containing 1-5% by weight of polyethylene and 20-40% by weight of rubbery particles (a2), and the melt flow index (MFR) of the TPO composite resin (A) is 15-25g/10min (230℃, 10kg), Shore A hardness is 85-90,
The rubbery particles (a2) are 1 selected from the group consisting of ethylene-propylene rubber, ethylene-propylene-diene rubber, ethylene-octene rubber, ethylene-butene rubber, ethylene-butadiene rubber, and styrene-ethylene-butadiene-styrene rubber. More than a species,
The polyolefin resin (B) is a linear low-density polyethylene obtained by copolymerizing ethylene with at least one comonomer selected from butylene, hexene and octene, and the melt flow index (MFR) of the polyolefin resin (B) is 0.5-5 g/10min. (190℃, 2.16kg),
The polyolefin-based elastomer (C) is an ethylene-octene rubber containing 40-45% by weight of octene based on the total weight of the ethylene-octene rubber, and the melt flow index (MFR) of the ethylene-octene rubber is 1-5g/10min (190℃, 2.16kg),
The TPO sheet has a thickness of 0.3-0.6mm, and the transmittance measured using Haze-Gard II (Toyoseiki Co.) is 4-19%.
delete delete delete delete delete delete delete delete delete delete The method of claim 1,
The TPO composite resin (A) further comprises at least one filler (a3) selected from the group consisting of carbon black, hard coal, heavy carbon, clay, talc, and silica.
The method of claim 12,
The filler (a3) is a TPO sheet that is contained in 20-40% by weight in the TPO composite resin (A).
The method of claim 1,
The TPO composite resin (A) is a TPO sheet further comprising one or more other additives (a4) selected from the group consisting of a crosslinking agent, a flame retardant and an anti-aging agent.
delete delete delete delete delete delete delete delete delete The method of claim 1,
The TPO sheet further comprises one or more additives selected from the group consisting of a plasticizer, an inorganic filler, a light stabilizer, a heat stabilizer, an antioxidant, a lubricant, a flame retardant, an antibacterial agent, and a hydrolysis resistant agent. delete