JPH044012A - Filter medium for bypass oil filter for internal combustion engine - Google Patents

Abstract

PURPOSE:To efficiently remove carbon particles and to eliminate the outflow of inorg. matter being danger of damaging an internal combustion engine by filtering a lubricating oil with this filter medium consisting of aramid fibers and other org. fibers. CONSTITUTION:This filter medium is formed with aramid fibers and other org. filters (e.g. linter pulp). The aramid fiber content of the medium is preferably controlled to 5-70% and the content of other org. fibers to 30-95%. The thickness of the medium is preferably adjusted to about 0.3-1mm. For example, 95 parts of linter pulp and 5 parts of aramid fibers are added to a beater filled with water to about 1% concn., macerated and then beaten, and the water content is adjusted to obtain a 0.5% sheet making raw material. A sheet having 250g/m<2> dry weight and 0.5mm thickness is obtained from the raw material. A lubricating oil is filtered by this filter medium, hence carbon particles are efficiently removed, and the outflow of inorg. matter being danger of damaging the engine is eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a filter medium for a bypass oil filter used in an internal combustion engine.

(Prior Art) In internal combustion engines, carbon particles are generated due to incomplete combustion, resulting in problems such as increased viscosity of lubricating oil, poor engine lubrication, and shortened lifespan of lubricating oil. Therefore, in order to remove carbon particles, cellulose fibers or a mixture of cellulose fibers and potassium titanate whiskers are used, and the material is used in various shapes. However, the cellulose fiber furnace material is insufficient in its ability to remove carbon particles, and the material mixed with potassium titanate whiskers has an excellent ability to remove carbon particles, but the outflow of the potassium titanate whiskers cannot be avoided. There is a risk that this may damage the engine.

(Problems to be Solved by the Invention) Cellulose fiber furnace materials do not have to worry about damaging the engine, but their ability to remove carbon particles is insufficient. Paper made with potassium titanate whiskers has an excellent ability to remove carbon particles, but There is a concern about engine damage. Therefore, there is a strong demand for a material that does not cause engine damage and has an excellent ability to remove carbon particles.

In view of this point, the present invention provides a furnace material that has excellent carbon particle removal ability and does not cause outflow of inorganic substances that may damage the engine.

(Means for solving #MM) As a result of intensive research, the present inventors found that carbon particles can be efficiently removed by heating lubricating oil with a furnace material made only of aramid fibers and other organic fibers. The present inventors discovered that the present invention is possible and that there is no outflow of inorganic substances.

That is, the gist of the present invention is a furnace material made of aramid fibers and other organic fibers.

Other organic fibers, which are one of the constituent elements of the present invention, are one or more types of organic fibers such as acrylonitrile fibers, PVA fibers, wood pulp, linter pulp, rayon, and polyester, and are capable of being made into paper. Any fiber can be used. Preferably, wood pulp and linter pulp are suitable from the viewpoint of paper-making properties. When producing a sheet using the wet method, one or more of these fibers are mixed and used while adjusting the degree of beating, fiber length, and degree of fibrillation.

The lumber of the present invention is manufactured by the following procedure.

A predetermined amount of fiber is added and dispersed in a beater filled with water. Lower the beater blade and adjust to the desired degree of beating. In this case, it is also possible to add a papermaking dispersant such as a surfactant to improve the dispersibility of the fibers. Using this raw material for papermaking, paper is made by a conventional method and dried to obtain a desired paper material.

The preferred content ratio of each component of the furnace material is aramid fiber 5 to 7.
0%, other organic fibers range from 30 to 95%.

The thickness of the wood of the present invention is preferably about 0.3 to 1 plate. If it is too thin, the liquid permeation channel will be too short and the carbon particle removal effect will tend to be incomplete, while if it is too thick, problems will arise in workability during pleating.

In order to improve the paper strength of the wood of the present invention, it is possible to add a commonly used paper strength enhancer and to coat it with a thermosetting resin as a post-processing.

When the furnace material of the present invention is used as an oil filter for an internal combustion engine, it can be processed into a shape suitable for the purpose, such as a chrysanthemum shape or a laminated type.

Additionally, surprisingly, it was found that flame retardancy and heat resistance strength were improved by blending aramid fibers.

Examples of manufacturing furnace materials and test examples will be explained in detail below.

(Example-1) 95 parts of linter pulp and 5 parts of aramid fiber were added to a beater filled with water at a concentration of about 1%, defibrated and then beaten.
The moisture content was adjusted to give a papermaking raw material of 0.5%. Using this papermaking raw material, a sheet having a dry weight of 250 g/bo and a thickness of 0.5 mm was obtained.

(Example-2) The dry weight was 260 g/rr in the same manner as in Example-1 with a composition of 30 parts of linter pulp and 70 parts of aramid fiber.
f, a sheet with a thickness of 0.5 mm was obtained.

(Comparative Example-1) A sheet with a dry weight of 250 g/n (and a thickness of 0.5 m) was obtained by the same operation as in Example-1 using 100 parts of linter pulp.

(Comparative Example-2) 95 parts of linter pulp, 5 parts of potassium titanate whisker
The dry weight was 24% by the same operation as in Example-1 with the composition of
A sheet with a weight of 5 g/bo and a thickness of 0.5 mm was obtained.

(Contamination filtration test) The furnace materials obtained in Examples and Comparative Examples were filtered under the following conditions to examine removal efficiency.

Test conditions ■ Liquid used SAE #30 motor oil 2 Contamination 5 OFTC-2 parts 3 Concentration 0.6% 4 Overpressure 4 kg/c Go 5 Effective filtration area 19. Oci 6? Filtration temperature Room temperature 7 Measurement Amount of contamination in liquid and stock solution (measured by gravimetric method) 8) Efficiency measurement method Removal rate (%) - (1-gamma concentration of γp liquid / contamination concentration of stock solution) x 100 Results (effects of the invention) ) As described above in detail, the present invention provides a highly efficient furnace material without the outflow of inorganic substances, which could not be obtained with conventional techniques, and is extremely beneficial to the industrial world.

Claims (1)

[Claims] A filter medium for a bypass oil filter for an internal combustion engine, characterized by being made of aramid fibers and other organic fibers.