KR-102959972-B1 - Oil seal including synthetic rubber with improved resistance for heat

Abstract

The present invention relates to an oil seal comprising synthetic rubber with improved heat resistance, and more specifically, to a synthetic rubber applicable to fields requiring excellent heat resistance by applying a composite of perfluororubber and fluororubber to the oil seal, and an oil seal comprising the same. The synthetic rubber with improved heat resistance comprises perfluororubber (FFKM); fluororubber (FKM); and a filler; wherein the fluororubber mixture comprises 1.5 to 2.5 parts by weight of perfluororubber (FFKM) per 1 part by weight of fluororubber (FKM), and the filler comprises fullerene and polytetrafluoroethylene (PTFE).

Inventors

• 이상현

Assignees

• 한성테크 주식회사

Dates

Publication Date

20260508

Application Date

20240318

Claims (9)

1. It includes synthetic rubber with improved heat resistance, The above synthetic rubber is, Perfluorogum (FFKM); Fluororubber (FKM); and Includes filler; but, A fluororubber mixture comprising 1.5 to 2.5 parts by weight of perfluororubber (FFKM) per 1 part by weight of the fluororubber (FKM), and The above filler is characterized by containing polytetrafluoroethylene (PTFE) in fullerene, and The above fluororubber mixture is, An oil seal comprising synthetic rubber with improved heat resistance, characterized by being manufactured by compounding at a temperature of 70 to 80 ℃ for 3 to 15 hours.
2. In Article 1, The above synthetic rubber is, An oil seal comprising synthetic rubber with improved heat resistance, characterized by being used for sealing in vehicles or semiconductor manufacturing equipment.
3. In Article 1, The above oil seal is, An oil seal comprising synthetic rubber with improved heat resistance, characterized by being used to seal a substance selected from the group consisting of oils including lubricating oil, hydraulic oil, and fuel oil; solvents including hydrochloric acid, sulfuric acid, nitric acid, acetic acid, ammonia water, and alkaline solutions; gases including LPG, city gas, and ozone; and distilled water.
4. delete
5. In Article 1, An oil seal comprising synthetic rubber with improved heat resistance, characterized by adding 0.5 to 50 parts by weight of the filler per 1 part by weight of the fluororubber mixture.
6. In Article 1, The above synthetic rubber is, An oil seal comprising synthetic rubber with improved heat resistance, characterized by a maximum allowable temperature (°C) of 270 to 310°C.
7. In Article 1, The above filler is, An oil seal comprising a synthetic rubber with improved heat resistance, characterized by comprising 2.0 to 2.5 parts by weight of polytetrafluoroethylene (PTFE) per 1 part by weight of fullerene.
8. delete
9. In Article 1, The above filler is, An oil seal comprising synthetic rubber with improved heat resistance, characterized by the addition of one or more of aerogel, glass bubbles, or glass flakes.

Description

Oil seal including synthetic rubber with improved heat resistance The present invention relates to an oil seal comprising synthetic rubber with improved heat resistance, and more specifically, to a synthetic rubber applicable to fields requiring excellent heat resistance by applying a composite of perfluororubber and fluororubber to the oil seal, and an oil seal comprising the same. Oil seals not only prevent the leakage of lubricants, water, or chemicals from gaps in machinery but also block the intrusion of dust and soil from the outside. Such oil seals are used in machinery across various fields, including automobiles, aircraft, ships, and home appliances. Meanwhile, the industry is demanding oil seals with improved heat resistance that do not degrade in quality even when used at high temperatures (around 300°C). Since the oil in contact with bearings in vehicles can reach temperatures up to 100°C, oil seals must possess excellent heat resistance along with oil resistance. In the semiconductor field as well, it is known that the generation of particles has an adverse effect on semiconductor manufacturing. This is because residues damaged at high temperatures can enter the process and cause process defects. Accordingly, there is a demand for the development of oil seals that generate minimal particles even when subjected to plasma degradation. Against this backdrop, Korean Registered Patent No. 10-2323568 discloses a perfluororubber composite with improved heat resistance and a method for manufacturing the same. The perfluororubber raw material comprises tetrafluoroethylene (TFE), perfluoromethyl vinyl ether (PFMVE), and CMS (cure site monomer), and the perfluororubber was used in an amount of 40 to 90 weight%. Although this improved the heat resistance of the sealing material, perfluororubber is very expensive, so its use is limited except for special applications. In other words, while perfluororubber is understood to possess the best heat resistance among almost all existing rubber elastomers, there are difficulties in using it without burden due to manufacturing costs. Figure 1 shows the structure of the oil seal of the present invention. FIG. 2 is a flowchart illustrating a method for manufacturing synthetic rubber with improved heat resistance according to the present invention. The terms used in this specification will be briefly explained, and the invention will be described in detail. The terms used in this invention have been selected based on currently widely used general terms while considering their functions within the invention; however, these terms may vary depending on the intent of those skilled in the art, case law, the emergence of new technologies, etc. Therefore, the terms used in this invention should be defined not merely by their names, but based on their meanings and the overall context of the invention. When a part of a specification is described as “comprising” a certain component, this means that, unless specifically stated otherwise, it does not exclude other components but may include additional components. Embodiments of the present invention are described below with reference to the attached drawings so that those skilled in the art can easily implement them. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. Specific details regarding the problem to be solved by the present invention, the means for solving the problem, and the effects of the invention are included in the embodiments and drawings described below. The advantages and features of the present invention, and the methods for achieving them, will become clear by referring to the embodiments described below in detail together with the accompanying drawings. Hereinafter, the present invention will be described in more detail with reference to the attached drawings. The present invention provides an oil seal comprising synthetic rubber with improved heat resistance. The synthetic rubber according to the present invention may be used for sealing in a vehicle or a semiconductor manufacturing device. That is, the synthetic rubber may be used for sealing in a vehicle, such as a valve stem or a radial shaft. In addition, when the synthetic rubber is used in a semiconductor manufacturing device, it may be used for sealing in a part that is directly or indirectly subjected to plasma irradiation. The oil seal according to the present invention has a sealing effect by applying a preload by making the inner diameter of the oil seal slightly smaller than the shaft dimension, and may include a metal plate (100), a spring (200), a main lip (300), a dust strip (400), and the synthetic rubber (500). The oil seal prevents leakage by forming an oil film of 1 to 3 μm on the shaft. Additionally, the oil seal may be used to seal a substance selected from the group consisting of oils including lubricating oil, hydraulic oil, and fuel oil; solvents including h