KR-20260064798-A - A compression-resistant seal rubber composition for an electric vehicle motor having improved heat resistance and compression set ratio, and a seal molded article manufactured thereby

KR20260064798AKR 20260064798 AKR20260064798 AKR 20260064798AKR-20260064798-A

Abstract

The present invention relates to a compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set, and a seal molded body produced thereby. The compression-resistant seal rubber composition for an electric vehicle motor with improved heat resistance and compression set according to the present invention comprises hydrogenated acrylonitrile-butadiene rubber (HNBR), and, based on 100 phr of the HNBR rubber, 10 to 20 phr of resin; 30 to 60 phr of reinforcing filler; 5 to 10 phr of non-reinforcing filler; 10 to 20 phr of plasticizer; 1 to 2 phr of anti-aging agent; 1 to 2 phr of fatty acid; 5 to 10 phr of crosslinking agent; 4 to 10 phr of crosslinking agent; and 1 to 3 phr of silane.

Inventors

김대현

Assignees

신성산업 주식회사

Dates

Publication Date: 20260508
Application Date: 20241029

Claims (10)

Characterized by comprising, for every 100 phr of hydrogenated acrylonitrile-butadiene rubber (HNBR), 10 to 20 phr of resin; 30 to 60 phr of reinforcing filler; 5 to 10 phr of non-reinforcing filler; 10 to 20 phr of plasticizer; 1 to 2 phr of anti-aging agent; 1 to 2 phr of fatty acid; 5 to 10 phr of crosslinking agent; 4 to 10 phr of crosslinking agent; and 1 to 3 phr of silane. Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above hydrogenated nitrile butadiene is characterized by containing 30 to 45 weight percent of ACN (Acrylonitrile). Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above resin Characterized as being polybutadiene Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above reinforcing filler Characterized by including at least one of Silica, FEF (Fast extrusion furnace), and MT (Medium thermal black). Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above non-reinforced filler Characterized by being calcium carbonate ( CaCO₃ ). Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above-mentioned crosslinking agent Characterized by being zinc oxide (ZnO) Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In Article 1, The above crosslinking agent Characterized as being an organic peroxide Compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set.
In a pressure-resistant seal rubber molded article for an electric vehicle motor using a pressure-resistant seal rubber composition for an electric vehicle motor having improved heat resistance and compression set of any one of claims 1 to 7, A compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set is characterized by being vacuum-molded using a vacuum-molding machine and an injection machine. Compression-resistant seal rubber molded article for electric vehicle motors with improved heat resistance and compression set.
In Paragraph 8, Characterized by compression vacuum forming at 165 to 175℃ Compression-resistant seal molded body for electric vehicle motors with improved heat resistance and compression set.
In Paragraph 8, Characterized by vacuum compression forming at 150 to 180 kgf/ cm² for 240 to 280 seconds. Compression-resistant seal molded body for electric vehicle motors with improved heat resistance and compression set.

Description

A compression-resistant seal rubber composition for an electric vehicle motor having improved heat resistance and compression set ratio, and a seal molded article manufactured thereby The present invention relates to a compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set, and a seal molded body produced thereby. Generally, an electric vehicle drive motor is a machine that generates rotational force using electricity, and it is used to move the vehicle by connecting a reduction gear to the motor shaft to transmit appropriate rotational force to the wheels. At this time, heat is generated in the internal components of the drive motor, such as the coil, stator (a stator made of iron material surrounding the coil), and magnet. Since the internal temperature rises due to the heat generated inside the motor and causes a decrease in motor performance and efficiency, motor components are required to have excellent heat resistance. Compression-resistant seals for motors, which are installed in electric vehicle motors, are rubber components designed to prevent fluid leakage and the entry of foreign substances into the motor. In addition to oil resistance, seals must have a low compression set to maintain sealing force when mounted in a groove. An increase in compression set hinders the seal's recovery from compression deformation, making sealing difficult and causing fluid leakage. Accordingly, compression-resistant seals for motors are required to have excellent heat resistance, oil resistance, and low compression set. Materials used for compression-resistant seals for electric vehicle motors include NBR (Acrylonitrile-butadiene rubber), HNBR (Hydrogenated acrylonitrile-butadiene rubber), and FKM (Vinylidene fluoride-hexafluoropropylene) rubber. At this time, although FKM rubber has the best heat and oil resistance, it is very vulnerable to cold (low-temperature embrittlement); therefore, specially manufactured low-temperature FKM rubber is used, but this has the limitation of being expensive. Meanwhile, while NBR rubber has excellent oil resistance, it has the disadvantage of being very vulnerable to ozone. Meanwhile, HNBR (Hydrogenated acrylonitrile-butadiene rubber) has the advantage of minimizing the limitations of FKM rubber and NBR rubber, and although efforts have been made to further improve the heat resistance, oil resistance, and compression set of HNBR rubber seal materials, designing an optimized formulation for the crosslinking system of HNBR rubber requires considerable difficulty. FIG. 1 shows the main characteristic peaks of FIR-ATR (Fourier Transform Infrared Attenuated Total Reflectance) of HNBR rubber applied to a compression-resistant seal rubber composition for an electric vehicle motor with improved heat resistance and compression set according to the present invention. FIG. 2 is a photograph of a compression-resistant seal rubber molded article for an electric vehicle motor with improved heat resistance and compression set according to the present invention. FIG. 3 is a conceptual diagram showing the mounting position of a compression-resistant seal rubber molded body for an electric vehicle motor with improved heat resistance and compression set according to the present invention. The specific features and advantages of the present invention will be described in detail below with reference to the accompanying drawings. Prior to this, if it is determined that a detailed description of the functions and configurations related to the present invention may unnecessarily obscure the essence of the invention, such detailed description will be omitted. The present invention relates to a compression-resistant seal rubber composition for electric vehicle motors with improved heat resistance and compression set, and a seal molded body produced thereby. The present invention will be described in detail below with reference to a preferred embodiment. However, the following embodiment is intended to specifically illustrate the present invention and is not limited thereto. The compression-resistant seal rubber composition for an electric vehicle motor with improved heat resistance and compression set according to the present invention comprises, for every 100 phr of hydrogenated acrylonitrile-butadiene rubber (HNBR), 10 to 20 phr of resin; 30 to 60 phr of reinforcing filler; 5 to 10 phr of non-reinforcing filler; 10 to 20 phr of plasticizer; 1 to 2 phr of anti-aging agent; 1 to 2 phr of fatty acid; 5 to 10 phr of crosslinking agent; 4 to 10 phr of crosslinking agent; and 1 to 3 phr of silane. In addition, the compression-resistant seal rubber composition for an electric vehicle motor with improved heat resistance and compression set according to the present invention may further include 1 to 2 phr of a co-crosslinking agent and 1 to 2 phr of a crosslinking activator with respect to 100 phr of the HNBR rubber. Hydrogenated acrylonitrile-