JPH0269596A - Curable lubricating composition - Google Patents

Abstract

PURPOSE:To provide the subject composition readily filled in sliding sections and giving cured moldings having good lubricating property, heat resistance and electric conductivity by containing graphite powder, boron nitride powder and an epoxy adhesive, curing agent and curing accelerator in a specific ratio. CONSTITUTION:The objective composition comprises (A) 35-47wt.% of graphite powder preferably containing carbon short fibers, (B) 0.1-13wt.% of boron nitride powder preferably containing molybdenum disulfide powder and/or antimony trioxide powder and (C) 52-61wt.% of an epoxy adhesive preferably containing an epoxy halide, curing agent and curing accelerator. The composition is useful for e.g., the electricity-collecting board of a pantograph, etc.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention ensures lubricity on sliding surfaces between metals, and
The present invention relates to a curable lubricating composition useful in devices 1 that require electricity to be passed through a sliding surface, such as a current collector plate of a pantograph.

(Prior Art and Problems to be Solved by the Invention) Conventionally, curable lubricant compositions used for this type of purpose were
As disclosed in Japanese Patent No. 133256 and No. 55-3375, predetermined locations of the sliding portion are filled with a liquid and then hardened by hot pressure molding. This method had the disadvantage that it was difficult to perform on-site fitting and processing.

Therefore, an object of the present invention is to easily fill a predetermined location of a sliding part, ensure that the molded product after hardening has sufficient lubricity on the sliding surface between metals, and It is an object of the present invention to provide a curable lubricating composition that has heat resistance sufficient to withstand frictional heat generation and does not impede current flow.

(Means for solving problems) The curable lubricating composition according to the present invention comprises: 1) Graphite powder = 35-47% by weight.

2) Boron nitride powder: 0.1-13% by weight, and 3
) Epoxy adhesive, curing agent, and curing accelerator: 52
~61% by weight.

The lubricating composition of the present invention also provides the following features in the above composition: 1) using a mixture of graphite powder and short carbon fibers instead of graphite powder; 2) using boron nitride and molybdenum disulfide instead of boron nitride; or 3) using a mixed powder with antimony trioxide, and 3) using a mixture of an epoxy adhesive and a halogenated epoxy instead of an epoxy adhesive. , preferred.

The present invention will be explained in detail below.

The graphite powder used as the first component of the lubricating composition of the present invention is used to impart lubricity and conductivity to the composition, and has an oil absorption of 45 to 124 DBP-ml/10.
If it is less than 35% by weight, the conductivity will not be sufficient, and if it exceeds 47% by weight, the lubricity will decrease, so it is used within the range of 35 to 47% by weight. This graphite powder may be used as a mixture with carbon short fibers, and in this case, the carbon short fibers have a fiber length of 2 m or less, and the usage ratio is in the range of o, oos to 0.15 to 1 part graphite powder. It is preferable that there be some, and this addition improves the bending strength.

The boron nitride powder as the second component is used to provide lubricity at high temperatures, and has an average particle size of 1 to 10-
However, if it exceeds 13% by weight, the conductivity will decrease, and if it is less than 0.1% by weight, the above effects cannot be obtained, so it is used within the range of 0.1 to 13% by weight. . This boron nitride may be used as a mixed powder with molybdenum disulfide added to improve lubricity at low temperatures, or may be used as a mixed powder with antimony trioxide added to provide flame retardance, or a mixture of these two types. Powder may also be used.

In this case, the ratio of molybdenum disulfide and antimony trioxide to boron nitride is preferably 1:1 or more, and 1:1 to 1:1,000, respectively.

Epoxy adhesive and curing agent as the third component.

and a curing accelerator are used to keep the lubricating composition of the present invention in a liquid state during use and to harden it after filling; if these are less than 52% by weight, the composition will lose fluidity; Exceeding this will reduce lubricity, so
It is required to be within the range of 52 to 61% by weight.

The ratio of each of the epoxy adhesive, curing agent, and curing accelerator used was 1:0.5:0.01.
~l:2:0.10 is preferred. Furthermore, this epoxy adhesive is preferably used in combination with a halogenated epoxy in order to impart flame retardancy, and in that case the addition ratio is 0.05 to 0.30 to the epoxy adhesive. The epoxy adhesive used here includes epoxidized bisphenol A, the curing agent includes 4-methylhexahydrophthalic anhydride, and the curing accelerator includes imidazole.

The lubricating composition according to the present invention can be obtained in liquid form by mixing the above-mentioned components at room temperature for about 20 minutes using a gate mixer or kneader. After pouring into the designated place, 11
It is heated and cured at 0°C for 120 minutes and used for practical use.

(Example) Hereinafter, specific aspects of the present invention will be explained based on Examples and Comparative Examples, but the present invention is not limited thereto. In this example, the test values for lubricity, heat resistance, and conductivity were obtained by the following methods.

[Test method]

As shown in Figure 1, width (W□) 30m, thickness (T) 10m,
Rectangular copper-based sintered alloy 1 with length (L) 60ma+
Width (W,) 10 mm in the length direction at the center of the top surface A of
A groove 2 with a depth (D) of 5 mm and a length (L) of 60 mm is provided,
This groove 2 is filled with a sample lubricating composition 3, and the sample is cured by heating at 110° C. for 120 minutes to obtain a test piece 4.

This test piece 4 was transferred to a rotating disk 5 of a lubrication tester shown in FIG.
and a constant load spring 6, and the rotating disk 5 is rotated at a constant speed by a motor 7.

A copper ring 8 is attached to the peripheral edge of the rotating disk 5, and the copper ring 8 and the hardened lubricant composition 3 in the groove 2 of the test piece 4 are brought into contact with each other under a constant load. .

The sliding direction at this time is the direction of the arrow in FIG. 1, and the speed at the sliding point is 50 km/h. Rotating disk 5
A voltage of 25V is applied between the test piece 4 and the test piece 4 with a current of 50A. Note that 9 in the figure is an insulating coupler.

The lubricity is A after continuous testing for 2 hours under these conditions.
It is shown by the depth of wear on the surface and the current value of the motor 7 at this time.

Heat resistance is evaluated by checking the softening, blistering, and smoking states of the cured composition 3 in the test piece 4 during a 2-hour test. It is necessary that the lubricating composition does not cause these phenomena. The temperature at this time is the measured value at point B of the sintered alloy 1.

The conductivity is indicated by a resistance value, and this value is required to be 5×10”Ω/a1 or less.

Example 1 Graphite powder with oil absorption of 45 DBP-ml/100 g: 94
0.0g boron nitride powder (average particle size 3jJ):
2. Qn epoxidized bisphenol A: 558
．． 6 N4-methylhexahydrophthalic anhydride: 47
4.0 # Imidazole: 25.4n to 5
The mixture was mixed for 20 minutes using a Q gate mixer to obtain a liquid composition.

This was filled into the groove 2 of the sintered alloy 1 shown in No. 1@ with a putty knife, and heated and hardened at 110° C. for 120 minutes.

Example 2 Graphite powder with oil absorption of 45 DBP-ml/100 g: 7
00. Og boron nitride powder (average particle size 3,1111)
: 40.0. .

Molybdenum disulfide: 40.01F Epoxidized bisphenol A: 644.2 #4-methylhexahydrophthalic anhydride: 546.6 If imidazole: 29.3N were mixed in the same manner as in the previous example to obtain a slurry composition. This was heated and cured in the same manner as in the previous example.

Example 3゜Exemplary graphite powder: 700. The same graphite powder instead of Og: 650. Short carbon fibers with Og and average length of 0.5-:
The mixture was mixed and heat-cured in the same manner as in the previous example, except that SO and Og were used.

Example 4゜Oil absorption amount 45DBP-ml/100g graphite powder near 0
0.0g boron nitride powder (average particle size 37j11):
4o, on antimony trioxide: 180
．． Q〃Molybdenum disulfide: 40.0
7F brominated epoxy (manufactured by M Kasei@, AER755):
lOO,O# Epoxidized bisphenol A: 449. On4
-Methylhexahydrophthalic anhydride: 466 and QII imidazole: 12.5# were mixed in the same manner as in the previous example to obtain a pasty composition. This was heated and cured in the same manner as in the previous example.

Comparative example 1゜In place of 940g of graphite powder in Example 1, oil absorption amount was 45DB
Example 1 except that P-ml/100 g of graphite powder was sso, o g and molybdenum disulfide was 26.0 g.
It was mixed and heated in the same manner as above.

Comparative example 2, 940 g of graphite powder of Example 1 and 2.0 g of boron nitride powder
Instead, when 1 ooo, o g of graphite powder with an oil absorption of 450 BP-+I11/100 g was mixed in the same manner as in Example 1, it solidified into a ball shape in the gate mixer, and sufficient mixing was not possible. Mixing was repeated for 20 minutes using the main roll. The resulting composition was so hard that a putty knife could not be inserted into it, and even when filled into the grooves of the jig shown in FIG. 1, there were many bubbles after curing.

The following table shows the values of wear amount, motor current value, resistance value, heat resistance, etc., which were measured by attaching each test piece obtained in each of the above examples and comparative examples to the lubricity tester described above. Ta.

(Effects of the Invention) The curable lubricant composition according to the present invention is in the form of liquid or putty when embedded in cloth, and has adhesive properties itself; Regardless of the shape, loading or burying can be done easily and easily.

(2) The obtained cured product has high heat resistance, excellent lubricity, and electrical conductivity.

[Brief explanation of the drawing]

The drawings are all related to the test method for each characteristic value in the examples of the present invention, and No. 11 (a) is a plan view of the test piece used for this test, (b) is a side view thereof, and No. 2 is a test piece. FIG. 2 is a schematic explanatory diagram of the device.

Claims (1)

[Claims] 1. 1) Graphite powder: 35 to 47% by weight, 2) Boron nitride powder: 0.1 to 13% by weight, and 3
) Epoxy adhesive, curing agent, and curing accelerator: 52
A curable lubricating composition comprising ~61% by weight. 2. The curable lubricating composition according to claim 1, wherein the graphite powder contains short carbon fibers. 3. The curable lubricating composition according to claim 1, wherein the boron nitride powder contains molybdenum disulfide and/or antimony trioxide powder. 4. The curable lubricating composition according to claim 1, wherein the epoxy adhesive contains a halogenated epoxy.