JPH0463895A - Tacky grease - Google Patents

Abstract

PURPOSE:To obtain a tacky grease with excellent operational torque characteristics, abrasive durability and good sound deadening effect when applied to a switch-operating part made of especially ABS resin by compounding a hydrocarbon synthetic base oil with Li salt of a higher fatty acid, resin particles and highly dielectric fine inorg. oxide particles. CONSTITUTION:A tacky grease is prepd. by compounding 100 pts.wt. hydrocarbon synthetic base oil (e.g. alpha-olefin synthetic oil with a viscosity usually made by compounding a base oil of 10-100cSt/40 deg.C with a high-viscosity base oil of 480cSt/40 deg.C), 5-30 pts., pref. 10-20 pts., Li salt of a higher fatty acid (e.g. Li stearate), 3-40 pts. fine resin particles with a particle diameter of 1-100mu (e.g. polyethylene or polyamide), 1-20 pts., pref. 1-10 pts., highly dielectric fine inorg. oxide particles with a particle diameter of 0.01-10mu, pref. 0.1-1.0mu (TiO2 and SnO2 are especially pref.) and, if necessary, up to 20 pts. liq. polyisobutylene or alpha-olefin oligomer as a thickening agent.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention applies to conventional adhesive greases used to prevent wear on various switch operating parts, levers, etc., as well as to obtain a smooth operating feel and sound dampening effect. Technology for vehicles such as automobiles and various home appliances.

The operating parts, levers, knobs, and controls are coated with adhesive grease to prevent wear and provide a smooth operating feel and sound deadening effect.

In this case, since ABS resin, which has good printability, is commonly used as the material for the parts of the switch operation part, a grease containing a polymer adhesive and a non-polar oil that does not corrode the resin is commonly used. , due to poor adhesion to ABS resin, it is ejected from sliding surfaces and runs out of grease, resulting in increased wear, poor operating feel, and reduced sound deadening effect.

In order to improve these shortcomings, measures have been taken to increase the amount of polymer adhesive blended or increase the viscosity of the base oil, but the torque increases at low temperatures and malfunctions occur. There is a problem.

The present inventors have previously discovered that a technique of blending polar resin particles such as nylon 12 into a grease based on non-polar α-olefin synthetic oil can be a solution to the above problem. (Special number 2106717).

However, I wonder if this technology is versatile (, nylon 12
The problem is that it cannot be applied to non-polar resins, such as polyethylene resins, which are lower in cost than polar resins such as polyethylene resins. That is, in the case of a composition in which polyethylene fine particles are blended into a grease whose nonpolar layer is a base oil, the adhesion (liquid permeability) between the fine particles and the grease base is insufficient, so that the grease It has poor stability and applicability, and cannot be expected to have a smooth operating feel or sufficient noise reduction effect.

Problems to be Solved by the Invention The present invention solves these problems and improves the use of resins, especially A.
In addition to exhibiting practically sufficient adhesion to coated parts made of BS resin, it also has excellent operating torque characteristics (i.e., low operating torque at low temperatures and large adhesion torque at room temperature), sliding durability, and resin resistance. This invention was made in order to provide a sticky grease that not only has the following properties but also has a good sound deadening effect.

Means for solving the problem, that is, the present invention, consists of 0 parts by weight of a hydrocarbon synthetic group id]I O, 5 to 30 parts by weight of a lithium salt of higher fatty acid, and a particle size of 1 to 30 parts by weight.
3 to 40 parts by weight of 100 μ resin fine particles and particle size 0.0
The present invention relates to a sticky grease containing 01 to 10 parts by weight of highly dielectric inorganic oxide fine particles of 1 to 1 μm.

Examples of the hydrocarbon synthetic base oil used in the present invention include α-olefin synthetic oil, refined paraffin oil, and the like. The viscosity of the base oil is not particularly limited, and is usually I C1-1.
00cst/ For example, base oil at 40°C is 480cst/
It has a viscosity of 40'C high viscosity base oil.

Examples of lithium salts of higher fatty acids include lithium stearate, lithium 12-hydrokine stearate, and mixtures thereof.

The amount of lithium salt of higher fatty acid to be blended is 5 to 30 parts by weight, preferably 10 to 20 parts by weight, per 100 parts by weight of the above base oil. If it is more than 30 parts by weight, the grease will be too hard and will have poor applicability. If it becomes bad and becomes less than 5 parts by weight,
When used in the sliding parts of switches, the wear resistance decreases, the grease becomes soft, the shear stability is poor, and it softens and flows out (the degree of oil separation increases).

As the resin fine particles, polyethylene, Acrylic homopolymer or copolymer (for example: - Miperon) can be used.
(manufactured by Mikata Petrochemical Industries, Ltd.), rMcAl (manufactured by Mitsui Ishiura Chemical Industries, Ltd.), polyamides (for example, nylon 12,
Examples include fine particles such as rsP-500J (manufactured by Toshi Co., Ltd.), etc.

The particle size of the resin fine particles is 1 to 100μ, and if it is less than 1μ, acrylic 0.2μ fine particles are used for experimental evaluation.
Although it is expensive, it does not have good adhesion to ABS resin, and it also has 100%
If it exceeds μ, the grease tends to aggregate when sliding is repeated, resulting in poor stability.

The blending amount of the resin fine particles is 3 to 40 parts by weight per 100 parts by weight of the base oil, and if it is less than 3 parts by weight, there is no effect of improving tackiness, and if it is more than 40 parts by weight,
The grease becomes hard and has poor applicability, and the abrasion resistance of the resin sliding surface also deteriorates.

Two or more of the above resin particles may be used in combination, if desired.

As highly dielectric inorganic oxide fine particles, TiO2, SnO
3,5b20X (X=3.4 or 5) etc., T10. and/or SnO2 are particularly preferred.

The particle size of the inorganic oxide fine particles is 0.01 to 10μ, preferably 0.1 to 1.0μ. If the particle size exceeds 10 μm, the purpose of adsorbing the highly dielectric inorganic oxide fine particles to the surface of the resin fine particles described above cannot be achieved. As inorganic oxide fine particles having such a particle size, commercially available products can be used as appropriate.

The blending amount of the inorganic oxide fine particles is 1 to 20 parts by weight, preferably 1 to 10 parts by weight, based on 100 parts by weight of the above base oil, and if it is 1 part by weight or less, it will not affect the resin sliding surface. The adhesion effect is small, and if the amount exceeds 20 parts by weight, the cost increases and no significant improvement in adhesion is observed.

Two or more of the above highly dielectric inorganic oxide fine particles may be used in combination, if desired.

In addition to the above-mentioned components, the adhesive grease according to the present invention may optionally contain other additives, such as thickeners (e.g., adhesive polymers such as liquid polyisobutylene and α-olefin oligomers). You may.

The amount of the thickener is usually up to 20 parts by weight per 100 parts by weight of the above-mentioned base oil, and if it exceeds 20 parts by weight, it will become highly viscous at low temperatures and the operating torque at low temperatures will increase, making it unusable.

Hereinafter, the present invention will be explained by examples.

Example 1 According to the formulation shown in Table 1, grease l
The properties of the grease are summarized in Table 1: After thoroughly stirring and mixing the α-olefin polymerized oil and lithium stearate, the mixture was heated to a temperature of 185°.
Continue stirring until it reaches C, then stop heating and continue stirring.
After cooling to room temperature, liquid polyisobutylene, polyethylene fine particles, and Tie.

After adding and mixing ultrafine mixed particles of SnO and SnO, finishing treatment was performed using a three-stage roll.

Examples 2 and 3 Greases 2 and 3 were prepared according to the procedure of Example 1. Table 1 shows the formulation and properties of these greases.

Comparative Examples 1 to 4 Greases 1 to 4 were prepared according to the procedure of Example 1. Table 1 shows the formulation and properties of these greases.

(The following is a blank space) Performance test of grease (1) Adhesiveness Sample grease was filled into the gap between the inner cylinder and the outer cylinder of the helicoid motile shown in Fig. 1, and the starting torque and rotating torque were measured using a strain gauge (inner diameter :30 open, clearance: 0.0
3+nm, average peripheral speed 157 cR/5ec).

In Figure 1, (1) is the inner cylinder, (2) is the outer cylinder, and (3) is the inner cylinder.
is tension wire, (4) is strainage, (5
) indicates the recorder, (6) indicates the flat carrier, and (7) indicates the motor.

(2) Low temperature properties Torque at -30'C was measured in accordance with JIS-2205.

(3) Adhesiveness to ABS resin A sample grease was applied to an ABS resin molded plate, and the adhesion between the molded plate and the grease and the dispersibility of resin particles in the grease were evaluated by microscopic observation.

(4) Sound deadening A swimming pool consisting of Yamagata Setokuyama and a steel hole.

Leno-Sui with sample grease applied to the moderation part.

The switch was operated in a soundless room, and a sound level meter [RION Precision Sound] was placed 30 cm away from the switch.
A level meter NA-4] was installed to measure the maximum value (dB) of the sound generated when the switch was operated.

(5) Bending test piece (ASTM-D638; 1/2” x I
/4" x 5") with sample grease and the maximum strain δ is 1
Regarding the case of ml, 2 mm or 3 mm,
After being left at 75° C. for 3 hours, the presence or absence of cracks was observed.

(6) Sliding durability ABS resin molded plate (70mmX 70mmX 3n+
As shown in Figure 2 (plan view), two diagonal lines (width 60μ, depth 30μ) are placed on the surface of
Apply sample grease to the shaded area.10 mg/
cm'), a test molded plate was prepared.

The molded plate to be tested was mounted on a repeated sliding durability testing device as shown in Figure 3 (cross-sectional view), and two movable pieces were rotated and slid within the sample grease application area of the molded plate to be tested. The sliding durability was evaluated by rotating the movable piece 50,000 times (15 times/min).

In Figures 2 and 3, (8) is an ABS resin molded plate, (9) is the sample grease coated surface, (lO) is the score line, and (11) is a movable plate that repeatedly slides on the grease coated surface. Piece (12) shows the motor. Note that the circular dotted line on the sample grease-applied surface in FIG. 2 indicates the sliding locus of the movable piece (11).

Grease 1 prepared in the above Examples and Comparative Examples
~3° and 1'~4° were subjected to the above performance test, and the results are shown in Table 2 below.

(Hereinafter, blank space) Effects of the Invention The adhesive grease according to the present invention is made of resin, especially ABS.
It shows practically sufficient adhesion to resin-coated parts, has excellent torque characteristics, sliding durability, and resin resistance, and has an excellent sound-dampening effect.
It is particularly suitable as a grease to be applied to switch operation parts, levers, knobs, cameras, etc. of vehicles such as automobiles and various home appliances.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram of the apparatus used to measure the starting torque and rotational torque of grease. FIG. 2 is a schematic plan view showing a sample grease coated on an ABS resin molded plate used to measure the sliding durability of the grease. FIG. 3 is a schematic cross-sectional view of a sliding durability testing device equipped with the molded plate shown in FIG. 2. (1) is a cylinder, (2) is an outer cylinder, (3) is a tension wire, (4) is a strain cage, (5) is a recorder (
6) is a flat tire, (7) is a motor, (8) is A B
S11 resin molded plate, (9) is sample grease application surface, (
10) indicates a score line, (11) a movable piece, and (12) a motor. Patent issuer: Tokai Rika Denki Seisakusho Co., Ltd. (1 agent) Patent attorney: Aoyama Ao (1 person) Figure 2 Figure 1 Figure 3

Claims (1)

[Scope of Claims] 1. 100 parts by weight of a hydrocarbon synthetic base oil, 5 to 30 parts by weight of a lithium salt of higher fatty acid, 3 to 40 parts by weight of fine resin particles with a particle size of 1 to 100 μm, and a particle size of 0.01 to 1 μm. A sticky grease containing 0.1 to 10 parts by weight of highly dielectric inorganic oxide fine particles. 2. The adhesive grease according to claim 1, which contains 5 to 20 parts by weight of liquid polyisobutylene and/or α-olefin oligomer as a thickener. 3. The adhesive grease according to claim 1 or 2, wherein the highly dielectric inorganic oxide fine particles are TiO_2 and/or SnO_2.