JPH05132689A - Silicone grease composition - Google Patents

Abstract

PURPOSE:To obtain a silicone grease composition consisting of a specific organopolysiloxane, thickening agent and zinc diethyldithiocarbamate, exhibiting excellent extreme pressure lubricating characteristics between steels and high- speed lubricating characteristics. CONSTITUTION:The objective composition consisting of (A) an organopolysiloxane such as methylphenylpolysiloxane of formula I [R is 1-14C monovalent hydrocarbon; 1<=(n)<=2000] having 10-10000cSt viscosity at 25 deg.C, (B) a thickening agent such as fatty acid metal soap, Teflon(R) powder or silica and (C) zinc diethyldithiocarbamate of formula II, preferably having 1-5mum average particle diameter and useful for high speed rotating parts and extreme pressure rotating parts of equipments.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a silicone grease composition, and more particularly to a silicone grease composition which has excellent lubricity and is therefore useful for high speed rotating parts and extreme pressure rotating parts of equipment.

[0002]

2. Description of the Related Art Silicone oils, particularly dimethyl silicone oils and methylphenyl silicone oils, are considered to be desirable as lubricating oils because of their excellent viscosity-temperature characteristics, heat and oxidation resistance, shear stability, and chemical stability. In fact, silicone greases based on these silicone oils show excellent temperature characteristics, heat resistance, oxidation resistance, and chemical stability. However, these silicone oils are not suitable for use at high speeds and high loads because they have poor boundary lubricity between steel and steel as compared with mineral oils and synthetic oils, and their applications are considerably limited.

[0003]

Therefore, in this silicone grease, an oiliness improver such as a fatty acid or its derivative, a chlorine compound, a fluorine compound, a phosphorus compound or an amine compound, and an extreme pressure additive are added to the silicone oil. Attempts have also been made to improve the boundary lubricity thereof by adding chlorinated paraffin or dialkyl chlorendate (see Japanese Patent Publication No. 51-38864),
1,2,3,4,7,8,9,10,13,13,1
4,14-dodecachloro-1,4,4a, 5,6,6
a, 7,10,10a, 11,12,12a-dodecahydro-1,4; 7,10-dimethanodibenzo (a, e)
Method of adding cyclooctene (Japanese Patent Laid-Open No. 62-2831)
However, sufficient boundary lubricity has not yet been obtained.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a silicone grease composition which has solved such disadvantages.
This is A) general formula

[Chemical 3] (Wherein R is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 14 carbon atoms, n is a number of 1 ≦ n ≦ 2,000),
It is characterized by comprising an organopolysiloxane having a viscosity at 25 ° C. of 10 to 10,000 cS, B) a thickener, and C) zinc diethyldithiocarbamate.

That is, the inventors of the present invention have conducted various studies to develop a silicone grease composition having improved extreme pressure lubricity and high speed lubricity of steel to steel, and as a result, the composition comprises silicone oil and a known thickener. When zinc diethyldithiocarbamate is added to the composition, this zinc diethyldithiocarbamate becomes an excellent extreme pressure additive. The present invention was completed by finding out and researching the blending amount of each component in this composition.
This will be described in more detail below.

[0006]

The present invention relates to a silicone grease composition, which comprises an organopolysiloxane, a thickener and zinc diethyldithiocarbamate, which has extreme pressure lubrication characteristics between steel and steel and high speed lubrication characteristics. Its excellent properties make it useful for high-speed rotating parts and extreme-pressure rotating parts of equipment.

The organopolysiloxane as component A) constituting the silicone grease composition of the present invention has the general formula

[Chemical 4] And R is a methyl group, an ethyl group, a propyl group,
Alkyl group such as butyl group, cycloalkyl group such as cyclohexyl group, alkenyl group such as vinyl group and allyl group, aryl group such as phenyl group and tolyl group, or a part of hydrogen atoms bonded to carbon atoms of these groups Or an unsubstituted or substituted monovalent hydrocarbon group having 1 to 14 carbon atoms, which is selected from a chloromethyl group substituted with a halogen atom or a cyano group, a trifluoropropyl group, a cyanoethyl group, etc. It is said that 90% is a methyl group, which has a viscosity of 1c at 25 ° C.
If it is smaller than S, the oil is easily separated and the heat resistance is deteriorated, and if it is larger than 10,000 cS, the torque at startup and running becomes high, which is not preferable. Therefore, the viscosity at 25 ° C. is 1 to 10,000 cS. , Methylphenyl polysiloxane, long-chain alkyl group-containing polysiloxane, and the like.

Next, the thickening agent as the component B) constituting the silicone grease composition of the present invention is one that is known in general silicone grease, for example, fatty acid metal soap, Teflon powder, organic clay mineral, urea. Resin, silica, etc. may be used, and the amount thereof to be added can be changed depending on the viscosity of the base oil and the desired hardness (consistency), and is not particularly limited, but 100 parts by weight of the above-mentioned organopolysiloxane is added. On the other hand, if it is less than 1 part by weight, it does not have thixotropy and becomes oily,
When the amount is more than 60 parts by weight, it becomes hard and does not become a grease. Therefore, it may be usually in the range of 1 to 60 parts by weight, but preferably in the range of 10 to 30 parts by weight.

Further, zinc diethyldithiocarbamate as the component C) constituting the silicone grease composition of the present invention has the general formula

[Chemical 5] Is indicated by.

This zinc diethyldithiocarbamate is an organopolysiloxane as component A), B).
It acts as an extreme pressure additive for a silicone grease composition consisting of a thickener as a component, but this one has improved lubricity but is difficult to grind if its average particle size is less than 1 μm. Therefore, it is economically disadvantageous, and if it is larger than 5 μm, it is not possible to expect a great improvement in lubricity and it is necessary to add a large amount.
The thickness is preferably 2 to 3 μm. In addition,
If the amount of the zinc diethyldithiocarbamate compounded is less than 1 part by weight per 100 parts by weight of the organopolysiloxane as the component A), the effect is too small and the effect is small.
It is economically disadvantageous to add more than 0 parts by weight, so 1
The amount may be in the range of ˜30 parts by weight, but the preferred range is 5 to 15 parts by weight.

[0011]

EXAMPLES Examples and comparative examples of the present invention will be given below.
The parts in the examples are parts by weight, and the viscosity is the value measured at 25 ° C.

Example 1 16 parts of lithium stearate was added to 84 parts of methylphenylpolysiloxane having a viscosity of 500 cS to obtain 18 parts.
After heating and stirring from 0 ° C to 210 ° C for 2 hours, it was cooled to room temperature, and then 1,2,3,4,7,8,9,10,1
3,13,14,14-dodecachloro-1,4,4a,
5,6,6a, 7,10,10a, 12,12a-dodecahydro-1,4; 7,10-dimethanodibenzo (a,
e) 30 parts of cyclooctane and 7 parts of zinc diethyldithiocarbamate Axel EZ [trade name of Kawaguchi Chemical Co., Ltd.] having an average particle diameter of 2.6 μm are added, and a share is added with a metal roll to give a silicone grease composition. When this was made, and the lubricity of this product was examined using a Falex wear tester and an ultra-high speed rolling wear tester, the results shown in Table 1 and Table 2 below were obtained.

Comparative Examples 1 and 2 In Example 1, 1, 2, 3, 4, 7, 8, 9, 10,
13,13,14,14-dodecachloro-1,4,4
a, 5, 6, 6a, 7, 10, 10a, 12, 12a-
A silicone grease composition (Comparative Example 1) was prepared in the same manner as in Example 1 except that dodecahydro-1,4; 7,10-dimethanodibenzo (a, e) cyclooctane and zinc diethyldithiocarbamate were not added. A silicone grease composition (Comparative Example 2) was prepared in the same manner as in Example 1 except that zinc diethyldithiocarbamate was not added, and these silicone grease compositions were treated in the same manner as in Example 1. When the lubricity was examined using a Rex type abrasion tester and an ultra high speed rolling abrasion tester, the results shown in Tables 1 and 2 were obtained.

[0014]

[Table 1]

[Table 2]

Example 2, Comparative Examples 3 to 9 60 parts of methyl-3,3,3-trifluoropropylsiloxane having a viscosity of 150 cS, 35 parts of Teflon powder and zinc diethyldithiocarbamate having an average particle size of 2.6 μm. 5 parts were uniformly mixed, and a shear was added with a metal roll to prepare a silicone grease composition, and the same procedure as in Example 2 was carried out except that this diethyldithiodicarbamate was used as the dialkyldithiocarbamate shown in Table 3. Silicone grease compositions were prepared by using the silicone grease compositions, and a four-ball lubrication test was performed on these silicone grease compositions, and the results shown in Table 3 were obtained.

[0016]

[Table 3]

[0017]

The present invention relates to a silicone grease composition, which is, as described above, obtained by adding a thickening agent and a predetermined amount of zinc diethyldithiocarbamate to an organopolysiloxane. Zinc diethyldithiocarbamate works as an extreme pressure additive, and has excellent steel-to-steel extreme pressure lubrication characteristics and high-speed lubrication characteristics, making it useful for high-speed rotating parts and extreme-pressure rotating parts of equipment. It has the industrial advantage of.

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Claims (2)

[Claims] 1. A) General formula: (Wherein R is an unsubstituted or substituted monovalent hydrocarbon group having 1 to 14 carbon atoms, n is a number of 1 ≦ n ≦ 2,000),
Organopolysiloxane having viscosity of 10 to 10,000 cS at 25 ° C. B) Thickener C) General formula A silicone grease composition comprising zinc diethyldithiocarbamate represented by: 2. The silicone grease composition according to claim 1, wherein the zinc diethyldithiocarbamate has an average particle size of 1 to 5 μm.