KR102446563B1 - flame retardant gasket containing polyamide - Google Patents

Abstract

The present invention relates to a flame-retardant gasket comprising polyamide. More specifically, the present invention relates to a flame-retardant gasket that comprises polyamide and has excellent durability, restoration performance and adhesive strength, as well as excellent flame-retardant properties, wherein the flame-retardant gasket is a gasket used as a sealing material for sealing a gap between a door and a door frame of a building or a gap between window frames.

Description

Flame retardant gasket containing polyamide

The present invention relates to a flame-retardant gasket containing polyamide, and more particularly, a gasket used as a sealing material for sealing a gap between a door and a door frame of a building or a gap between a window frame and has excellent durability, resilience and adhesion. Rather, it relates to a flame-retardant gasket comprising polyamide which is also excellent in flame retardancy.

A gasket is a generic term for a thin plate-shaped piping material inserted into a joint surface of an object for maintaining airtightness, and is also called a seal.

In general, a gasket used as a sealing material for sealing a gap between a door and a door frame of a building or a gap between a window frame is used for the purpose of preventing water leakage and soundproofing.

These gaskets are mainly made of synthetic rubber, polyvinyl chloride (PVC) or ethylene-propylene-diene monomer (EPDM)-based rubber material. In particular, the EPDM-based material (especially gray) is approximately 90 % or more is used.

On the other hand, when a fire occurs in a building, the gasket is also ignited. In the case of a conventional rubber gasket, a halogen-based toxic gas toxic to the human body is generated, which can cause serious damage to people inside the building. In addition, if the gasket cannot withstand the heat caused by the fire and is lost, this causes a gap, which opens the path of the flame due to the gap, and the flame is transmitted to the surrounding buildings, causing secondary damage.

Accordingly, there is a need to develop a gasket that not only has flame retardancy but also satisfies the properties that the gasket should have.

Republic of Korea Patent Publication No. 10-2071347 (announced on January 30, 2020)

In order to solve the above problems, an object of the present invention is to provide a flame-retardant gasket including polyamide having excellent durability, restoring force, and adhesion, as well as excellent flame retardancy.

In order to solve the above problems, the flame-retardant gasket including the polyamide of the present invention may include a polyamide resin, a flame retardant and an inorganic filler.

In a preferred embodiment of the present invention, the flame retardant may include a polyolefin based thermoplastic vulcanizate.

In a preferred embodiment of the present invention, the polyolefin-based thermoplastic vulcanizate may have a density of 0.99 to 1.49 g/cm ³ measured in accordance with ISO 1183 test standards.

In a preferred embodiment of the present invention, the polyolefin-based thermoplastic vulcanizate may have a shore hardness of 68 to 103 (23° C., 15 sec, Shore A) measured according to the ISO 868 test standard.

In a preferred embodiment of the present invention, the polyolefin-based thermoplastic vulcanizate may have a tensile stress of 452 to 679 psi (23° C.) measured according to the IOS 37 test standard.

In a preferred embodiment of the present invention, the polyolefin-based thermoplastic vulcanizate may have a tensile strength at break of 1048 to 1572 psi (23° C.) measured according to the IOS 37 test standard.

In a preferred embodiment of the present invention, the polyolefin-based thermoplastic vulcanizate may have an elongation at break of 440 to 660% (23° C.) measured according to the IOS 37 test standard.

In a preferred embodiment of the present invention, the flame retardant gasket may include 15 to 35 parts by weight of a flame retardant and 4 to 12 parts by weight of an inorganic filler based on 100 parts by weight of the polyamide resin.

In a preferred embodiment of the present invention, the flame retardant may further include a compound represented by the following formula (1).

[Formula 1]

In Formula 1, A is -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ - or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ - is.

In a preferred embodiment of the present invention, the flame retardant may include 70 to 90% by weight of the polyolefin-based thermoplastic vulcanizate and 10 to 30% by weight of the compound represented by Formula 1, based on the total weight%.

In a preferred embodiment of the present invention, the flame-retardant gasket comprising the polyamide of the present invention may be for a window frame.

The flame-retardant gasket comprising the polyamide of the present invention is a gasket used as a sealing material for sealing a gap between a door and a door frame of a building or a gap between a window frame, and has excellent durability, restoring force and adhesion, as well as excellent flame retardancy.

Hereinafter, with reference to the accompanying drawings, embodiments of the present invention will be described in detail so that those of ordinary skill in the art to which the present invention pertains can easily implement them. The present invention may be embodied in many different forms and is not limited to the embodiments described herein. In order to clearly explain the present invention in the drawings, parts irrelevant to the description are omitted, and the same reference numerals are added to the same or similar components throughout the specification.

The flame-retardant gasket including the polyamide of the present invention may include a polyamide resin, a flame retardant, and an inorganic filler.

Specifically, the flame retardant gasket including the polyamide of the present invention may contain 15 to 35 parts by weight, preferably 20 to 30 parts by weight, of a flame retardant, based on 100 parts by weight of the polyamide resin, and if the flame retardant is less than 15 parts by weight If it is included, there may be a problem that the flame retardant performance is lowered, and if it exceeds 35 parts by weight, there may be a problem in that the tensile strength, elongation rate and adhesive strength are lowered.

In addition, the flame-retardant gasket containing the polyamide of the present invention may contain 4 to 12 parts by weight, preferably 6 to 10 parts by weight, of an inorganic filler, based on 100 parts by weight of the polyamide resin, and satisfies such a range by weight. Thus, the flame-retardant gasket containing the polyamide of the present invention may not only have excellent tensile strength, elongation rate, and adhesive strength, but also have a small permanent compression set and excellent flame retardancy performance.

The flame retardant of the present invention may include a polyolefin based thermoplastic vulcanizate.

A thermoplastic vulcanizate is a binary polymer material characterized by a structure in which crosslinked rubber particles, which are soft segments, are finely dispersed in a thermoplastic resin, which is a hard segment. Therefore, it is excellent in molding processability. In addition, it has excellent mechanical strength, weather resistance, and heat resistance, as well as having the lowest specific gravity among thermoplastic elastomers (TPE), so it can be lightened and colored.

Specifically, the polyolefin-based thermoplastic vulcanizate of the present invention may have a structure in which Ethylene propylene diene monomer (EPDM) rubber is dispersed in a polypropylene resin.

The polyolefin-based thermoplastic vulcanizate of the present invention may have a density of 0.99 to 1.49 g/cm ³ , preferably 1.11 to 1.36 g/cm ³ , measured by applying the ISO 1183 test standard mutatis mutandis.

In addition, the polyolefin-based thermoplastic vulcanizate of the present invention has a shore hardness of 68 to 103 (23 ° C, 15 sec, Shore A), preferably 77 to 95 (23 ° C., 15 sec, Shore A).

In addition, the polyolefin-based thermoplastic vulcanizate of the present invention may have a tensile stress measured according to the IOS 37 test standard of 452 to 679 psi (23° C.), preferably 509 to 623 psi (23° C.). .

In addition, the polyolefin-based thermoplastic vulcanizate of the present invention has a tensile strength at break of 1048 to 1572 psi (23° C.), preferably 1179 to 1441 psi (23° C.), measured in accordance with the IOS 37 test standard. ) can be

On the other hand, the flame retardant of the present invention may further include a compound represented by the following formula (1).

[Formula 1]

In Formula 1, A is -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ - or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ -, preferably -CH ₂ -, -CH ₂ CH ₂ - or -CH ₂ CH ₂ CH ₂ -.

Specifically, the flame retardant of the present invention, with respect to the total weight% of the polyolefin-based thermoplastic vulcanizate, 70 to 90% by weight, preferably 75 to 85% by weight and 10 to 30% by weight of the compound represented by Formula 1, preferably It may contain 15 to 25% by weight, and if it is out of such a weight% range, the flame-retardant gasket containing the polyamide of the present invention has excellent tensile strength, elongation, and adhesive strength, and has a small permanent compression set, There may be a problem in that the flame retardant performance also does not satisfy all of the excellent characteristics.

The inorganic filler of the present invention may include, without limitation, components known in the art, preferably calcium carbonate (CaCO ₃ ), talc, magnesium carbonate, clay, talc, barium sulfate, silica, mica, oxide Titanium, carbon black, graphite, metal oxide, carbon nanotubes, graphite, wollastonite (wollastonite) and may include at least one selected from nanosilver, more preferably may include calcium carbonate, most preferably Calcium carbonate having an average particle diameter of 0.5 to 5 μm, preferably 1 to 3.5 μm may be included.

Furthermore, the flame-retardant gasket including the polyamide of the present invention may further include at least one selected from a fluidizing agent and a crosslinking aid, and preferably, a fluidizing agent and a crosslinking aid.

Specifically, the flame-retardant gasket comprising the polyamide of the present invention is based on 100 parts by weight of the polyamide resin, 5 to 25 parts by weight of a fluidizing agent, preferably 10 to 20 parts by weight, and 1 to 10 parts by weight of a crosslinking aid, preferably may contain 3 to 7 parts by weight, and by satisfying such a weight part range, the flame-retardant gasket containing the polyamide of the present invention has excellent tensile strength, elongation rate, and adhesive strength, and has a small permanent compression set , the flame retardant performance may also be excellent.

The fluidizing agent of the present invention serves to impart fluidity, and components known in the art may include without limitation, and preferably naphthenic oils, paraffinic oils, and olefinic oils in the art derived from petroleum fractions. , may include one or more selected from aromatic oil, mineral oil, vegetable oil, and synthetic oil, and more preferably include paraffin-based oil.

In addition, the crosslinking aid of the present invention is an additive capable of obtaining a fast curing reaction, and may include components known in the art without limitation, preferably metal oxide, metal halide, and stear. It may include at least one selected from among acids (stearic acid), and more preferably include zinc stearate.

In the above, the present invention has been mainly described with respect to the embodiment, but this is only an example and does not limit the embodiment of the present invention. It can be seen that various modifications and applications not exemplified above are possible without departing from the scope. For example, each component specifically shown in the embodiment of the present invention can be implemented by modification. And the differences related to these modifications and applications should be construed as being included in the scope of the present invention defined in the appended claims.

Example 1: Preparation of Flame Retardant Gasket Containing Polyamide

Based on 100 parts by weight of polyamide resin, 25 parts by weight of a flame retardant, 8 parts by weight of an inorganic filler, 15 parts by weight of a fluidizing agent, and 5 parts by weight of a crosslinking aid are mixed to prepare a flame retardant gasket composition, and injection molding the polyamide A flame-retardant gasket including

At this time, with respect to the total weight% as a flame retardant, the density measured by applying the ISO 1183 test standard mutatis mutandis is 1.24 g/cm ³ , the shore hardness measured by applying the ISO 868 test standard mutatis mutandis is 86 (23 ℃, 15 sec, Shore A ), the tensile stress measured according to the IOS 37 test standard was 566 psi (23 ℃), and the tensile strength at break measured according to the IOS 37 test standard was 1310 psi (23 ℃). ), 80 wt% of a polyolefin-based thermoplastic vulcanizate (ExxonMobil, Santoprene® 251-80W232) having an elongation at break of 550% (23°C) measured in accordance with the IOS 37 test standard, and Formula 1- A mixture of 20 wt% of the compound represented by 1 was used, calcium carbonate (CaCO ₃ ) having an average particle diameter of 3 μm was used as an inorganic filler, paraffin-based oil was used as a fluidizing agent, and zinc as a crosslinking aid. Stearic acid (zinc Stearate) was used.

[Formula 1-1]

In Formula 1-1, A is -CH ₂ CH ₂ -.

Example 2: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, with respect to 100 parts by weight of the polyamide resin, 10 parts by weight of a flame retardant, 8 parts by weight of an inorganic filler, 15 parts by weight of a fluidizer, and 5 parts by weight of a crosslinking aid were mixed to prepare a flame retardant gasket composition, and this A flame-retardant gasket including polyamide was manufactured by injection molding.

Example 3: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, with respect to 100 parts by weight of the polyamide resin, 40 parts by weight of a flame retardant, 8 parts by weight of an inorganic filler, 15 parts by weight of a fluidizing agent, and 5 parts by weight of a crosslinking aid were mixed to prepare a flame retardant gasket composition, A flame-retardant gasket including polyamide was manufactured by injection molding.

Example 4: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, a mixture of 95% by weight of a polyolefin-based thermoplastic vulcanizate and 5% by weight of a compound represented by Formula 1-1 is used as a flame retardant based on the total weight%, and finally flame retardant containing polyamide A gasket was prepared.

Example 5: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, a mixture of 65% by weight of polyolefin-based thermoplastic vulcanizate and 35% by weight of the compound represented by Formula 1-1 is used as a flame retardant with respect to the total weight%, and finally flame retardant containing polyamide A gasket was prepared.

Example 6: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, with respect to the total weight% as a flame retardant, the density measured by applying the ISO 1183 test standard mutatis mutandis is 1.26 g/cm ³ , the shore hardness measured by applying the ISO 868 test standard mutatis mutandis is 75 (23 ℃, 15 sec , Shore A), the tensile stress measured according to the IOS 37 test standard was 334 psi (23℃), and the tensile strength at break measured according to the IOS 37 test standard was 696 psi. (23°C), 80% by weight of a polyolefin-based thermoplastic vulcanizate (ExxonMobil, Santoprene® 151-70W256) having an elongation at break of 480% (23°C) measured according to the IOS 37 test standard, and the above A flame-retardant gasket including polyamide was finally prepared by using a mixture of 20% by weight of the compound represented by Formula 1-1.

Example 7: Preparation of Flame Retardant Gasket Containing Polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, the density measured according to the ISO 1183 test standard as a flame retardant is 1.24 g/cm ³ , the shore hardness measured by applying the ISO 868 test standard mutatis mutandis is 86 (23 ℃, 15 sec, Shore A), IOS The tensile stress measured according to the 37 test standard was 566 psi (23 ℃), the tensile strength at break measured according to the IOS 37 test standard was 1310 psi (23 ℃), IOS 37 Using only polyolefin-based thermoplastic vulcanizates (ExxonMobil, Santoprene® 251-80W232) having an elongation at break of 550% (23°C) measured in accordance with 37 test standards, finally A flame retardant gasket was prepared.

Comparative Example 1: Preparation of flame-retardant gasket containing polyamide

A flame-retardant gasket including polyamide was prepared in the same manner as in Example 1. However, unlike Example 1, using only the compound represented by Formula 1-1 as a flame retardant, a flame retardant gasket including polyamide was finally prepared.

Experimental Example: Measurement of physical properties of flame-retardant gasket containing polyamide

The following physical properties were measured for each of the flame-retardant gaskets containing polyamide prepared in Examples 1 to 7 and Comparative Example 1, and are shown in Table 1 below.

(1) Measurement of tensile strength and elongation

Tensile strength and elongation of each of the flame-retardant gaskets including the polyamide prepared in Examples 1 to 7 and Comparative Example 1 were measured in accordance with KS M 6518: 2016 test standards.

(2) Adhesive strength measurement

Adhesiveness of each of the flame-retardant gaskets including the polyamide prepared in Examples 1 to 7 and Comparative Example 1 was measured by applying the ASTM C 794 test standard.

(3) Measurement of permanent compression set

The compression set of each of the flame-retardant gaskets including the polyamide prepared in Examples 1 to 7 and Comparative Example 1 was measured in accordance with ASTM D 395 test standard.

(4) Measurement of flame retardancy performance

The flame-retardant gasket containing the polyamide prepared in Examples 1 to 7 and Comparative Example 1 was cut to a size of 50 mm in width, 50 mm in length, and 10 mm in thickness, and KS M3032 regulations were applied mutatis mutandis, by the limiting oxygen index (LOI) method. The flame-retardant performance was measured (a flame-retardant standard of 28 or higher is judged to be excellent).

division Example 1 Example 2 Example 3 Example 4 Tensile strength (MPa) 6.7 6.7 3.8 6.0 Elongation (%) 5.1×10 ² 5.1×10 ² 4.7×10 ² 5.0×10 ² Adhesive strength (kg/cm) 9.4 9.5 5.4 8.8 Permanent compression set (%) 7 9 24 12 Flame retardant performance 31 20 32 28 division Example 5 Example 6 Example 7 Comparative Example 1 Tensile strength (MPa) 6.1 6.4 5.7 5.2 Elongation (%) 5.0×10 ² 5.1×10 ² 4.9×10 ² 4.8×10 ² Adhesive strength (kg/cm) 8.7 9.1 8.6 6.9 Permanent compression set (%) 14 9 14 20 Flame retardant performance 23 29 26 22

As shown in Table 1, the flame-retardant gasket containing polyamide prepared in Example 1 was not only excellent in tensile strength, elongation, and adhesive strength, but also had a small permanent compression set and excellent flame retardant performance.

Simple modifications or changes of the present invention can be easily carried out by those skilled in the art, and all such modifications or changes can be considered to be included in the scope of the present invention.

Claims (5)

Based on 100 parts by weight of the polyamide resin, 15 to 35 parts by weight of a flame retardant and 4 to 12 parts by weight of an inorganic filler are included,
The flame retardant is based on the total weight%, polyolefin-based thermoplastic vulcanizate (polyolefin based thermoplastic vulcanizate) 70 to 90% by weight and 10 to 30% by weight of the compound represented by the following formula (1) containing polyamide, characterized in that it comprises flame retardant gasket.
[Formula 1]

In Formula 1, A is -CH ₂ -, -CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ -, -CH ₂ CH ₂ CH ₂ CH ₂ - or -CH ₂ CH ₂ CH ₂ CH ₂ CH ₂ - is.
According to claim 1,
The polyolefin-based thermoplastic vulcanizate is
Density measured according to ISO 1183 test standard is 0.99 ~ 1.49 g/cm ³ ,
Shore hardness measured according to ISO 868 test standard is 68 ~ 103 (23℃, 15 sec, Shore A),
The tensile stress measured according to the IOS 37 test standard is 452 ~ 679 psi (23℃),
Tensile strength at break measured according to the IOS 37 test standard is 1048 ~ 1572 psi (23℃),
Flame-retardant gasket comprising polyamide, characterized in that the elongation at break measured in accordance with the IOS 37 test standard is 440 to 660% (23°C).
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