KR100544307B1 - Cable insulating composites for lcd having high heat-resistance and high voltage-resistance and the cable using thereit - Google Patents

Abstract

In the present invention, the vinyl acetate content is 10 to 25% by weight, the first ethylene vinyl acetate having a melt index of 1 to 10; Second ethylene vinyl acetate having a vinyl acetate content of 25 to 45% by weight and a melt index of 0.1 to 5; And 3 to 3 parts by weight of the base resin blended with maleic anhydride; and 3 to 100 parts by weight of the base resin blended with vinyl silane-coated metal hydrate including high heat resistance and high voltage resistance. Disclosed is a composition and a cable using the same. The electric wire material composition which concerns on this invention simultaneously satisfies the high heat resistance and high withstand voltage of the High voltage cut through test standard of UL3239, and achieves the effect which is low in manufacturing cost and excellent in extrusion processability.

Vinyl acetate, maleic hydride, LCD, metal hydrate, vinyl silane

Description

Cable insulation composition for cable with high heat resistance and high voltage resistance and cable using the same {CABLE INSULATING COMPOSITES FOR LCD HAVING HIGH HEAT-RESISTANCE AND HIGH VOLTAGE-RESISTANCE AND THE CABLE USING THEREIT}

1 is a schematic diagram showing a cross section of a cable to which a wire insulation composition is applied according to an embodiment of the present invention.

* Short description of drawing symbols *

1: Conductor 2: Insulator

The present invention relates to a wire insulation composition for LCD having a high heat resistance and high voltage resistance and a cable using the same.

In the booming global IT industry, the display market is growing rapidly. As the demand for and demand for large displays increases, the displays are rapidly growing in size.

However, when a display based on an existing CRT is enlarged, an LCD display is attracting attention as a display capable of replacing the weight because the weight becomes excessively heavy and takes up a lot of space.

Since such LCD displays necessarily generate high heat and require a very high driving voltage, materials having high heat resistance and high voltage resistance have also been required in materials used in LCD displays.

However, since the conventional general-purpose resin could not satisfy both high heat resistance and high withstand voltage at the same time, a material having both high heat resistance and high withstand voltage was realized by using a silicone rubber-based or fluorine-based resin.

In particular, since the silicone rubber resin has a very high elasticity and molecular weight, it is excellent in heat resistance at high temperature, that is, heat deformation property, and also has a very high insulation resistance characteristic in structure, and at the same time high heat resistance and high voltage resistance Could be satisfied.

However, when the silicone rubber-based resin or fluorine-based resin is used as the base resin, there is a problem that the price of the base resin itself is expensive, the wire extrusion process is difficult, and the cost of the product increases due to an increase in processing cost. there was.

Therefore, the present invention has been made to solve the above problems,

It is an object of the present invention to provide a wire insulation composition for LCD and a cable using the same, which are not only significantly lower in manufacturing cost compared to existing products, but also have high heat resistance and high voltage resistance that are easily extruded.                         

The above object of the present invention, the vinyl acetate content of 10 to 25% by weight, the first ethylene vinyl acetate having a melt index of 1 to 10; Second ethylene vinyl acetate having a vinyl acetate content of 25 to 45% by weight and a melt index of 0.1 to 5; And 3 ethylene vinyl acetate containing maleic anhydride; for LCD having high heat resistance and high withstand voltage, including 5 to 100 parts by weight of vinylsilane-coated magnesium or aluminum hydrate based on 100 parts by weight of the blended base resin. Achieved by a wire insulation composition.

And it is preferable that the said composition further contains 0.1-10 weight part of antioxidants, 0.05-5 weight part of processing aids, and 1-8 weight part of crosslinking aids with respect to 100 weight part of said base resins, The said base resin is a base In 100 parts by weight of the resin, the third ethylene vinyl acetate is preferably contained in 1 to 20 parts by weight, the first ethylene vinyl acetate, the vinyl acetate content of 19% by weight, it is preferable that the melt index of 2.5 ethylene vinyl acetate, The second ethylene vinyl acetate is preferably ethylene vinyl acetate having a vinyl acetate content of 33% by weight and a melt index of 0.2.

The above object of the present invention is also achieved by a cable comprising an insulator composed of the above wire insulation composition.

Hereinafter, a wire insulation composition for LCD having high heat resistance and high voltage resistance and a cable using the same according to the present invention will be described in detail.

The present invention blends a general-purpose polyolefin resin such as polyvinylacetate as a base resin, and applies an inorganic additive for strengthening heat resistance thereto, and in particular, to the technical idea of blending an inorganic additive and a resin for strengthening the bond between resins in the base resin. Based.

That is, in the present invention, as a base resin, ethylene vinyl acetate having a low vinyl acetate content and a high melt index, ethylene vinyl acetate having a high vinyl acetate content and a low melt index and ethylene vinyl acetate introduced therein, Inorganic additives are added.

Preferably, as the base resin of the present invention, the vinyl acetate content is 10 to 25% by weight, and the melt index is 1 to 10, which is excellent in voltage resistance but poor in heat resistance, that is, in the range of such vinyl acetate content and melt index. Ethylene vinyl acetate (hereinafter referred to as first ethylene vinyl acetate) and excellent heat resistance but low voltage resistance, that is, vinyl acetate content in the range of such vinyl acetate content and melt index, 25 to 45% by weight, melt index 0.1 Ethylene vinyl acetate (hereinafter referred to as "second ethylene vinyl acetate") blended with ethylene vinyl acetate (hereinafter referred to as "third ethylene vinyl acetate") incorporating maleic hydride which improves binding to the inorganic additive. Blend and use

At this time, the third ethylene vinyl acetate is preferably mixed 1 to 20 parts by weight in 100 parts by weight of the base resin.

When the amount is less than 1 part by weight, the binding with the inorganic additive is poor, resulting in poor heat resistance improvement, while the improvement in the voltage resistance is insignificant. When the amount is more than 20 parts by weight, the mechanical properties decrease and the price increases rapidly.                     

An inorganic additive is applied to the base resin prepared as described above, and a metal hydrate is used as the inorganic additive, and a vinylsilane-coated metal hydrate is used to significantly increase the degree of crosslinking and to significantly increase heat resistance. Among many metal hydrates capable of vinylsilane coating, the metal is preferably magnesium or aluminum. Magnesium has a higher flame retardancy than aluminum, and thus has a high flame retardancy. However, magnesium has a disadvantage of being expensive and hygroscopic. On the other hand, aluminum is relatively inexpensive but its use is limited when the processing temperature is higher than 180 ° C. .

In addition to the base resin, in addition to the vinylsilane-coated metal hydrate, an antioxidant, a processing aid and a crosslinking aid are added.

In each composition, it is preferable to add 5 to 100 parts by weight of vinylsilane-coated metal hydrate with respect to 100 parts by weight of the base resin, and in the case of antioxidant, it is preferable to add 0.1 to 10 parts by weight of the processing aid. In the case of, it is preferable to add 0.05-5 weight part, and it is preferable to add 1-8 weight part of crosslinking adjuvant.

When the vinyl silane-coated metal hydrate is added at less than 5 parts by weight, the effect on improving heat resistance is insignificant, and when it exceeds 100 parts by weight, the voltage resistance is very poor.

In the case of the antioxidant, heat resistance is inferior in less than 0.1 weight part, and when it exceeds 10 weight part, a crosslinking degree falls and a mechanical property falls.

In the case of the processing aid, the load during extrusion processing increases and the appearance of the product becomes poor at less than 0.05 part by weight, and when it exceeds 5 parts by weight, mechanical properties tend to be lowered.

In the case of the crosslinking aid, the crosslinking reaction is not performed properly at less than 1 part by weight, resulting in poor crosslinking degree and poor heat resistance. As the molecular weight decreases, the physical properties and the heat resistance deteriorate.

1 is a schematic diagram showing a cross section of a cable according to an embodiment of the present invention.

As shown in FIG. 1, the cable has a structure in which the insulator 2 wraps around the conductor 1 and constitutes the insulator 2 using the wire insulation composition according to the present invention as described above.

Hereinafter, the present invention will be described in more detail by explaining preferred embodiments of the present invention. However, the present invention is not limited to the following examples, and various forms of embodiments can be implemented within the scope of the appended claims, and the following examples are only common to those skilled in the art to complete the present disclosure. It is intended to facilitate the implementation of the invention to those with knowledge.

EXAMPLE

In this embodiment, all of the examples include ethylene vinyl acetate having a melt index of 2.5 and a vinyl acetate content of 19% by weight, ethylene vinyl acetate having a melt index of 0.2 and a vinyl acetate content of 33% by weight, and ethylene vinyl having maleic hydride. Acetate was applied, vinyl silane coated metal hydrate was added and antioxidant, processing aid, crosslinking aid was added. The vinylsilane-coated metal hydrate used in Examples 1 to 4 and Comparative Example C used magnesium as the product name Kisuma 5P as Kyowa. In the case of aluminum, Albermarle's product name MARTINAL OL 104S was used, and the results were almost similar to those of the present example.

In particular, in Examples 1 and 2, ethylene vinyl acetate content having a good withstand voltage of 19 wt%, ethylene vinyl acetate resin having a melt index of 2.5, while a high heat resistance vinyl acetate content of 33 wt%, an ether having a melt index of 0.2 Heat resistance was reinforced using ethylene vinyl acetate.

In Examples 3 and 4, an ethylene vinyl acetate resin having 33% by weight of vinyl acetate having good heat resistance and a melt index of 0.2 was mainly used, and 19% by weight of vinyl acetate having good voltage resistance and 2.5 having a melt index. Ethylene vinyl acetate was used to reinforce the withstand voltage.

On the other hand, Example 1 and Example 2, Example 3 and Example 4 was different from the amount of ethylene vinyl acetate introduced maleic anhydroside, Example 3 was applied particularly large amounts of vinylsilane-coated metal hydrate.

Table 1 shows the prescription of each example.

Example Compounding agent One 2 3 4 Ethylene Vinyl Acetate (VA 33% by weight, MI 0.2) 27 28.5 66.5 63 Ethylene Vinyl Acetate (VA 19% by weight, MI 2.5) 63 66.5 28.5 27 Maleic Anhydride Introduced Ethylene Vinyl Acetate 10 5 5 10 Antioxidant 5 5 5 5 Vinylsilane Coated Metal Hydrate 20 20 50 20 Processing aid 2 2 2 2 Crosslinking aid 4 4 4 4

[Comparative Example]

In Comparative Example A, only 33% by weight of vinyl acetate content having excellent heat resistance but low voltage resistance and ethylene vinyl acetate resin having a melt index of 0.2 were used. In Comparative Example B, vinyl acetate content having excellent voltage resistance but low heat resistance was used. Only 19 wt% of ethylene vinyl acetate resin having a melt index of 2.5 was used. In Comparative Example C, only 19 wt% of vinyl acetate content having a low heat resistance and a resin having a melt index of 2.5 were used, and a vinylsilane-coated metal hydrate and maleic hydride-introduced ethylene vinyl acetate were added. While maintaining, the heat resistance is complemented.

Table 2 shows the prescription of each comparative example.

Comparative example Compounding agent A B C Ethylene Vinyl Acetate (VA 33% by weight, MI 0.2) 100 - Ethylene Vinyl Acetate (VA 19% by weight, MI 2.5) - 100 100 Maleic Anhydride Introduced Ethylene Vinyl Acetate - - 5 Antioxidant 5 5 5 Vinylsilane Coated Metal Hydrate - - 20 Processing aid 2 2 2 Crosslinking aid 4 4 4

Tensile strength, room temperature characteristics, heating deformation, room temperature volume resistance, and high voltage cut through of the wire material compositions of the Examples and Comparative Examples were evaluated.

The evaluation method of physical property is as follows.

Room temperature characteristics were measured by ASTM D638. The measurement speed was 500 +/- 25 mm / min.

The heat deformation was measured according to the IEC 811 standard. The applied load was 0.25 kg.                     

Room temperature volume resistance was measured by ASTM D257.

High voltage cut through was measured by UL3239. The conditions were 105 ° C. for 7 hours, 0.9 kg of load was applied, and a voltage of 4.5 kV was applied to determine whether or not the energization was performed.

Table 3 shows the evaluation results.

As can be seen from Table 3, Examples 1 and 2 are mainly used in the vinyl acetate content of 19% by weight, ethylene vinyl acetate having a melt index of 2.5 shows room temperature volume resistance is very high, vinyl acetate content By applying ethylene vinyl acetate of 33% by weight, the melt index of 0.2 to enhance the heat resistance it was confirmed that the heat deformation is also significantly reduced compared to Comparative Example B.

In addition, in Example 1 and Example 2, the addition of ethylene vinyl acetate in which the ethylene vinyl acetate was added, Example 1 was found to be superior in both heat resistance and voltage resistance than that of Example 2 added less.

Examples 3 and 4 were applied to 33% by weight of vinyl acetate content having excellent heat resistance and ethylene vinyl acetate having a melt index of 0.2, while maintaining a heat strain rate, 19% by weight of high vinyl acetate and a melt index of 2.5 ethylene. When vinyl acetate was added to reinforce the withstand voltage, it can be seen that the withstand voltage was significantly improved as compared with Comparative Example A.

In the case of Comparative Example C, the vinylsilane-treated metal hydrate and maleic hydride ethylene vinyl acetate were added, and the heat resistance was significantly improved as compared with Comparative Example B, which was not added.

As a result, as shown in this example, vinyl acetate content 19% by weight, ethylene vinyl acetate with a melt index of 2.5, vinyl acetate content with 33% by weight, ethylene vinyl acetate with a melt index of 0.2 and ethylene vinyl with maleic hydride. When the vinylsilane-coated metal hydrate was added to the base resin blended with acetate, it was found that heat resistance and withstand voltage were significantly improved at the same time, thereby satisfying the UL3239 High voltage cut through test standard.

The electric wire material composition which concerns on this invention simultaneously satisfies the high heat resistance and high withstand voltage of the High voltage cut through test standard of UL3239, and achieves the effect which is low in manufacturing cost and excellent in extrusion processability.                     

Although the present invention has been described in connection with the above-mentioned preferred embodiments, it is possible to make various modifications or variations without departing from the spirit and scope of the invention. Accordingly, the appended claims will cover such modifications and variations as fall within the spirit of the invention.

Claims (6)

First ethyl vinyl acetate having a vinyl acetate content of 10 to 25% by weight and a melt index of 1 to 10; Second ethylene vinyl acetate having a vinyl acetate content of 25 to 45% by weight and a melt index of 0.1 to 5; And 3 ethylene vinyl acetate containing maleic anhydride; based on 100 parts by weight of the base resin blended, A wire insulation composition for LCD having high heat resistance and high voltage resistance, comprising 5 to 100 parts by weight of vinylsilane-coated magnesium or aluminum hydrate. The method of claim 1, wherein the composition, With respect to 100 parts by weight of the base resin, 0.1 to 10 parts by weight of antioxidant, 0.05 to 5 parts by weight of processing aid and 1 to 8 parts by weight of crosslinking aid, characterized in that the wire for the LCD having high heat resistance and high withstand voltage Insulation composition. The method of claim 1, wherein the base resin, 3 to 3 parts by weight of 3 ethylene vinyl acetate in 100 parts by weight of the base resin, characterized in that the wire insulation composition for LCD having high heat resistance and high voltage resistance. The method of claim 1, wherein the first ethylene vinyl acetate, Vinyl acetate content of 19% by weight, the wire insulation composition for LCD with high heat resistance and high voltage resistance, characterized in that the ethylene vinyl acetate having a melt index of 2.5. The method of claim 1, wherein the second ethylene vinyl acetate, Vinyl acetate content 33% by weight, ethylene vinyl acetate having a melt index of 0.2, the wire insulation composition for LCD having a high heat resistance and high voltage resistance. A cable comprising an insulator composed of the wire insulation composition according to any one of claims 1 to 5.

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