KR-102963152-B1 - Silicone rubber composition for oil filter sealing with excellent chemical resistance and seal for oil filter containing the same

KR102963152B1KR 102963152 B1KR102963152 B1KR 102963152B1KR-102963152-B1

Abstract

The present invention relates to a fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance and an oil filter seal comprising the same. According to the present invention, not only can the penetration of oil and organic solvents be suppressed, but chemical resistance can also be improved to minimize changes in physical properties.

Inventors

민용기
김동환
장진수
김진성

Assignees

주식회사 에이치알에스

Dates

Publication Date: 20260512
Application Date: 20231107

Claims (8)

Polysiloxane represented by the following chemical formula 1; Reinforcing filler; Plasticizer; Additive for improving heat resistance; Curing agent; and A chemical resistance improving additive represented by the following chemical formula 8 Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance: [Chemical Formula 1] [Chemical Formula 8] Here, n and m are identical or different from each other, and each is independently an integer from 0 to 1000, and w is an integer from 1 to 1000, and R1 to R8 are identical or different from one another and each independently hydrogen, halogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 24 carbon atoms, a substituted or unsubstituted heteroalkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 5 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, a substituted or unsubstituted heteroarylalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted cycloalkenyl group having 3 to 20 carbon atoms, a substituted or unsubstituted cycloalkenyl group having 3 to 20 carbon atoms, a substituted or Selected from the group consisting of an unsubstituted heteroaralkyl group having 3 to 30 carbon atoms and a substituted or unsubstituted heteroalkenyl group having 1 to 20 carbon atoms, When R1 to R8 are substituted, the substituent may be selected from the group consisting of hydrogen, deuterium, cyano group, nitro group, halogen group, hydroxyl group, alkyl group having 1 to 30 carbon atoms, alkenyl group having 2 to 30 carbon atoms, alkynyl group having 2 to 24 carbon atoms, heteroalkyl group having 2 to 30 carbon atoms, aralkyl group having 6 to 30 carbon atoms, aryl group having 5 to 30 carbon atoms, heteroaryl group having 2 to 30 carbon atoms, heteroarylalkyl group having 3 to 30 carbon atoms, alkoxy group having 1 to 30 carbon atoms, alkylsilyl group having 1 to 30 carbon atoms, arylsilyl group having 6 to 30 carbon atoms, aralkylamine group having 6 to 30 carbon atoms, and heteroarylamine group having 2 to 24 carbon atoms.
In paragraph 1, The above-mentioned heat resistance improving additive is selected from the group consisting of cerium oxide, cerium (IV) hydroxide, and mixtures thereof. Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance.
In paragraph 1, The above plasticizer is a compound represented by the following chemical formula 2. Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance: [Chemical Formula 2] Here, o is an integer from 1 to 1000, and R 9 to R 14 are identical or different from one another and each independently hydrogen, halogen, a substituted or unsubstituted alkyl group having 1 to 30 carbon atoms, a substituted or unsubstituted alkenyl group having 2 to 30 carbon atoms, a substituted or unsubstituted alkynyl group having 2 to 24 carbon atoms, a substituted or unsubstituted heteroalkyl group having 2 to 30 carbon atoms, a substituted or unsubstituted aralkyl group having 6 to 30 carbon atoms, a substituted or unsubstituted aryl group having 5 to 30 carbon atoms, a substituted or unsubstituted heteroaryl group having 2 to 30 carbon atoms, a substituted or unsubstituted heteroarylalkyl group having 3 to 30 carbon atoms, a substituted or unsubstituted cycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted heterocycloalkyl group having 3 to 20 carbon atoms, a substituted or unsubstituted cycloalkenyl group having 3 to 20 carbon atoms, a substituted or selected from the group consisting of an unsubstituted heteroaralkyl group having 3 to 30 carbon atoms and a substituted or unsubstituted heteroalkenyl group having 1 to 20 carbon atoms, and When the above R 9 to R 14 are substituted, the substituent may be selected from the group consisting of hydrogen, deuterium, cyano group, nitro group, halogen group, hydroxyl group, alkyl group having 1 to 30 carbon atoms, alkenyl group having 2 to 30 carbon atoms, alkynyl group having 2 to 24 carbon atoms, heteroalkyl group having 2 to 30 carbon atoms, aralkyl group having 6 to 30 carbon atoms, aryl group having 5 to 30 carbon atoms, heteroaryl group having 2 to 30 carbon atoms, heteroarylalkyl group having 3 to 30 carbon atoms, alkoxy group having 1 to 30 carbon atoms, alkylsilyl group having 1 to 30 carbon atoms, arylsilyl group having 6 to 30 carbon atoms, aralkylamine group having 6 to 30 carbon atoms, and heteroarylamine group having 2 to 24 carbon atoms.
In paragraph 1, The above reinforcing filler is dry silica or wet silica, and The specific surface area of the above silica is 150 to 200 m² /g Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance.
In paragraph 1, The molecular weight (MW) of the polysiloxane represented by the above chemical formula 1 is 800,000 to 1,000,000. Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance.
In paragraph 1, The above composition further comprises a filler for inhibiting oil penetration. Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance.
In paragraph 6, The above filler is selected from the group consisting of CaCO₃, Mg(OH)₂, CaSiO₃, KAl₂(Al,Si)₄O₁₀(OH,F)₂, Al₂Si₂O₅(OH)₄, CaMg(CO₃)₂ , BaSO₄ , Al ( OH ) ₃ , Mg ( OH ) ₂ , SiO₂ , siliceous earth (celite), ZnO, TiO₂ , and mixtures thereof. Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance.
A composition according to any one of claims 1 to 7 Oil filter seal.

Description

Fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance and seal for oil filter containing the same The present invention relates to a fluorosilicone rubber composition for oil filter sealing with excellent chemical resistance and an oil filter seal comprising the same. A vehicle engine is a device that converts fuel into mechanical power by burning it, and it is a thermal engine that utilizes thermal energy. The principle of the engine is to generate power by supplying fuel into a cylinder and using the explosive force produced by combustion to move a piston back and forth. Meanwhile, friction occurs between parts during the operation of such an engine, so engine oil is added to the engine to minimize this friction and reduce wear on the parts caused by friction. This engine oil contains combustion oxides generated during the combustion of fuel and metal particles generated by friction between parts within the engine, and it is common practice to install an oil filter to filter out these substances. These oil filters are components of the engine system and serve to remove dust, metal powder, carbonized material, oxidation products, etc., mixed in the engine oil. The structure of the oil filter consists of a case, an element, and a bypass valve. The bypass valve inside the filter is designed to open when the element is blocked, thereby supplying oil to ensure that the oil is always circulating. The rubber part installed in this oil filter system to serve as a seal is called an oil filter packing or an oil filter gasket. Referring to the technology described in Korean Patent Publication No. 10-2006-0011120, there are disclosed technologies for rubber packing materials in engine oil filter system layers that are generally used, in which polyacrylate rubber with excellent oil resistance and wear resistance is used as the main component, and carbon black, anti-aging agents, plasticizers, crosslinking agents, etc. are added thereto. However, rubber packing made with such a composition has the problem of not providing satisfactory results in preventing engine oil leakage. In particular, there is a problem in that the sealing effect is significantly reduced, such as when oil leakage occurs during initial starting, as it is vulnerable under ultra-low temperatures like those in Siberia. Accordingly, it is necessary to develop a composition for oil filter sealing with improved oil resistance and chemical resistance. Hereinafter, embodiments of the present invention are described in detail so that those skilled in the art can easily implement the invention. However, the present invention may be embodied in various different forms and is not limited to the embodiments described herein. A vehicle engine is a device that converts fuel into mechanical power by burning it, and it is a thermal engine that utilizes thermal energy. Specifically, since engines are applied in various fields such as vehicles, engine oil is added to minimize friction generated during operation and to suppress wear on parts. This engine oil contains various combustion oxides produced during fuel combustion and metal particles generated by friction between engine parts; therefore, it is common practice to install an oil filter (fuel filter) to filter out these substances. Meanwhile, in the case of gasoline vehicles, the oil filter is mostly located inside the fuel tank and the filter replacement cycle is relatively long (after driving about 150,000 km), whereas in the case of diesel vehicles, the oil filter (fuel filter) has a shorter replacement cycle than gasoline vehicles (after driving about 30,000 to 60,000 km) as it must also perform the role of filtering and collecting moisture. If this filter replacement cycle is exceeded for a long time, there is a problem that fuel efficiency decreases and engine noise becomes severe. Meanwhile, fluorosilicone rubber generally has excellent chemical resistance, including oil resistance, and cold resistance (low temperature properties), so it is widely used as a material for gaskets, seals, and O-rings in the automotive and aerospace industries, and is particularly mainly applied as a heat-resistant engine part in automobiles. Although such fluorosilicone rubber has excellent characteristics suitable for sealing materials, such as a wide operating temperature range, weather resistance, heat resistance, oil resistance, and chemical resistance, it has the disadvantage of severe changes in physical properties under extreme conditions, such as fuel oil immersion tests. Therefore, there is a need to develop a material that has excellent long-term oil immersion performance and can minimize changes in physical properties under extreme conditions. Accordingly, the applicant conducted research on a silicone rubber composition for oil filter sealing that can reduce the rate of change in physical properties by suppressing the penetration of oil and organic solvents, and at the same