JPH0741565A - Part for engine cooling water system - Google Patents

Abstract

PURPOSE:To produce a part for an engine cooling water system from a relatively lightweight and low-cost material. CONSTITUTION:The part, such as a radiator tank of an automobile, is produced by molding a polypropylene resin contg. 30-50wt.% glass fiber with an aspect ratio of 100 or higher.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to materials for various parts used in engine cooling water systems.

[0002]

2. Description of the Related Art A water pump housing for circulating cooling water to an engine, a radiator tank for cooling engine cooling water, and an engine cooling water system component such as a water outlet fitting connected from an engine body to a radiator upper hose are lightweight. For this purpose, the material is being replaced with a metal from a polyamide resin, and this polyamide resin usually has a fiber length of 0.2 to 0.4 m.
m, the aspect ratio, which is the ratio of fiber length to diameter, is 20
Approximately 30% by weight of glass fiber is contained in an amount of about 60 so that the required physical properties such as strength and rigidity can be obtained.

However, since polyamide resin has hygroscopicity, engine cooling water system parts made of polyamide resin, which are constantly in contact with cooling water, greatly deteriorate in physical properties of strength and rigidity due to moisture absorption. The specific gravity is 1.4, which is considerably large, and the cost is relatively high.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to make it possible to construct an engine cooling water system component by using a relatively lightweight and inexpensive material.

[0005]

For this reason, the engine cooling water system component according to the present invention is formed of a polypropylene resin containing glass fibers having an aspect ratio of 100 or more.

Further, the engine cooling water system component according to the present invention is molded from a polypropylene resin containing glass fiber having an aspect ratio of 100 or more in a weight ratio of 30 to 50%.

[0007]

In other words, the polypropylene resin has a low hygroscopicity and contains glass fibers having an aspect ratio of 100 or more, so that the physical properties of strength and rigidity required for engine cooling water system parts can be easily obtained. Moreover, since polypropylene resin has a heat resistance of about 120 ° C, there is no thermal problem even if it is used for engine cooling water system parts, and polypropylene resin is relatively lightweight and low in cost. In particular, it is suitable as a material for a cooling water system component of a vehicle engine, and further, the glass fiber contained in the polypropylene resin is 30 by weight.
When it is -50%, the engine cooling water system component molded by it can sufficiently enhance the strength and rigidity without impairing the weight reduction.

[0008]

EXAMPLES Examples of the present invention will be described below. Engine cooling water system parts such as a water pump housing, radiator tank, and water outlet fitting in a vehicle engine are injection-molded with polypropylene resin. The polypropylene resin has an aspect ratio of 100 or more and a diameter of 15 μm.
The following glass fibers are contained in a weight ratio of 10 to 60%, preferably 30 to 50%.

Since polypropylene resin has a heat resistance of about 120 ° C., it has no thermal problem even if it is used for engine cooling water system parts, and the aspect ratio is as shown in FIG. Since the flexural modulus of the polypropylene resin is rapidly increased by containing about 10% by weight or more of the glass fiber having a weight ratio of about 100 or more, the polypropylene resin having a relatively low weight ratio of the glass fiber has a large strength. , It is suitable for the materials of lightweight engine cooling water system parts that do not require rigidity.

On the other hand, if the weight ratio of the glass fibers contained is too large, the specific gravity of the polypropylene resin becomes large, which is not preferable. Especially, the polypropylene resin containing 30 to 50% by weight of the glass fibers has a specific gravity. It is relatively small and has strength and rigidity equal to or higher than the above polyamide resin containing glass fiber, and the cost of polypropylene resin is relatively low. Therefore, engine cooling molded by this polypropylene resin is possible. The water system parts are suitable for physical properties, are lightweight and inexpensive, and have very excellent properties in practical use.

By the way, the physical properties of the above-mentioned polyamide resin containing glass fiber and the above examples will be concretely compared. As a polyamide resin, the fiber length is 0.2 to
0.4 mm, diameter 7 μm, aspect ratio about 29-57
Containing 30% by weight of glass fiber (PA)
-GF), and the polypropylene resin of the example contains 30% by weight of glass fiber having a fiber length of 1 to 3 mm, a diameter of 7 μm, and an aspect ratio of about 143 to 429. Targeting (PP-GF) is as shown in the table below.

When dry (measurement temperature is 23 ° C.): PA-GF PP-GF Tensile strength (kgf / cm square) 1,900 1,200 Bending strength (kgf / cm square) 2,500 1 , 500 Flexural modulus (kgf / cm square) 81,000 58,000

In a moisture absorption state (measurement temperature is 23 ° C.) when immersed in 100 ° C. water for 18 hours: PA-GF PP-GF Tensile strength (kgf / cm square) 970 1,040 Bending strength (Kgf / cm square) 1,300 1,350 Flexural modulus (kgf / cm square) 40,000 53,000

In a hygroscopic state (measurement temperature is 80 ° C.) when immersed in 100 ° C. water for 18 hours: PA-GF PP-GF Tensile strength (kgf / cm square) 690 780 Bending strength (kgf) / Cm square) 1,000 900 Flexural modulus (kgf / cm square) 3,300 3,500

That is, the glass fiber-containing polypropylene resin has improved physical properties, especially after moisture absorption, to be substantially equal to or higher than those of the polyamide resin, and the former has a specific gravity of 1.1. On the other hand, the latter has a specific gravity of 1.4, and the engine cooling water system parts made of the polypropylene resin have a weight reduction ratio of about 20% as compared with the polyamide resin product, and the material cost is also about Since the cost is reduced by 30% and the moldability is the same, it can be said that the engine cooling water system parts made of the polypropylene resin are very useful.

[0016]

The engine cooling water system component according to the present invention is molded from polypropylene resin containing glass fiber having an aspect ratio of 100 or more.
Molded with a polypropylene resin containing 30 to 50% by weight of glass fiber, it can retain the required physical properties of strength and rigidity, is lighter in weight and lower in cost than conventional resin products. Therefore, it is particularly suitable for vehicles.

[Brief description of drawings]

FIG. 1 is a performance diagram of an example of the present invention.

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Claims (2)

[Claims] 1. An engine cooling water system component molded from a polypropylene resin containing glass fibers having an aspect ratio of 100 or more. 2. An engine cooling water system component formed of a polypropylene resin containing 30 to 50% by weight of glass fiber having an aspect ratio of 100 or more.