JPH07116461B2 - Lubricating resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lubricating resin composition.

[Conventional technology]

In recent years, as the weight of machines has been reduced, synthetic resin products have been widely used as machine parts, and synthetic resins having excellent sliding characteristics are required for those used in bearings. Conventionally, polyamide, polyacetal, polyethylene, fluorine resin and the like have been used as synthetic resins having good slidability. These can be used even in the low load and low speed regions even without lubrication, but as the load and speed increase, they become seized or flow due to frictional heat and become unusable. Fluorocarbon resin, especially tetrafluoroethylene resin, shows excellent sliding characteristics by adding a filler to improve wear characteristics, but this can be molded only by compression molding and is very expensive. It has the drawback of being. Therefore, a means has been adopted in which a solid lubricant is added to other synthetic resins to improve the sliding characteristics, but this method does not sufficiently improve the sliding characteristics under high speed and high load. To solve the above problem, there is a method of adding a lubricating oil to a synthetic resin to form a so-called oil-containing plastic. Specific methods are 1) simply mixing the lubricating oil with the resin and 2) retaining the lubricating oil. Add carrier with lubricating oil 3) 1) above
In addition to 2) and 2), a fibrous filler may be added as an oil conductor. Such oil-impregnated plastics are intended to have sliding characteristics by leaching lubricating oil, but (1) the friction coefficient is not stable at a low value,
(2) Oil leaches when heated, (3) Poor formability, (4) Carrier scrapes mating material during sliding, (5)
Oil easily separates during molding or kneading, (6) physical properties of the material deteriorate, (7) oil easily sticks to the sliding surface to cause dust, etc. (8) abnormal wear occurs once the oil runs out, There were various problems.

[Problems to be solved by the invention]

As described above, in the prior art, it is not possible to obtain a material in which the friction coefficient is stable at a low value, the wear coefficient is small, and the mechanical properties (especially strength) are not deteriorated.
There is a problem that even synthetic resins having many excellent properties are not suitable for sliding materials that require low friction and wear resistance.

[Means for solving problems]

In order to solve the above problems, the present invention provides a synthetic resin 10
0.5 to 30.0 parts of an organopolysiloxane having a unit containing an epoxy group is blended with 0 part (parts by weight, the same applies hereinafter) to form a three-dimensional network structure of the organopolysiloxane in the synthetic resin of the previous period. This means adopting a means for producing a resin composition having The details are given below.

First, the synthetic resin in the present invention is not particularly limited and may be any thermosetting or thermoplastic resin, for example, a phenol resin, a urea resin,
Melamine resin, melamine / phenol co-condensation resin, xylene-modified phenol resin, urea / guanamine co-condensation resin, amino resin, acetoguanamine resin, melamine anamin resin, polyester resin, diallyl phthalate resin, xylene resin, epoxy resin, epoxy acrylate resin, Silicone resin, urethane resin, polytetrafluoroethylene, chlorotrifluoroethylene resin, etrafluoroethylene-hexafluoroprepylene copolymer, tetrafluoroethylene-perfluoroalkylvinylether copolymer, vinylidene fluoride resin, ethylene-tetra Fluoroethylene copolymer, ethylene-chlorofluoroethylene copolymer, vinyl chloride resin, vinylidene chloride resin, polyethylene (low density, high density, ultra high molecular weight), chlorination Riorefuin, polypropylene, modified polyolefin, water crosslinking polyolefin, ethylene -
Vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, polystyrene, ABS resin, polyamide,
Methacrylic resin, polyacetal, polycarbonate,
Cellulosic resin, polyvinyl alcohol, polyurethane elastomer, polyimide, polyetherimide, polyamideimide, ionomer resin, polyphenylene oxide, methylpentene polymer, polyallyl sulfone, polyallyl ether, polyether ketone, polyphenylene sulfide, polysulfone , Wholly aromatic polyester, polyethylene terephthalate, polybutylene terephthalate, thermoplastic polyester elastomers, blends of various polymer substances, and the like.

Next, the organopolysiloxane having a unit containing an epoxy group in the present invention is obtained by adding an epoxy group to a homopolymer or a copolymer of siloxanes such as dimethylsiloxane, methylphenylsiloxane, and trimethylfluoropropylsiloxane. Introduced, for example [Here, m = 5-10000 and n = 2-100. ] Etc. can be mentioned.

In the present invention, the organopolysiloxane having a unit containing an epoxy group per 100 parts of the synthetic resin is 0.
The reason for blending 5 to 30.0 parts is that the effect of improving the sliding properties is insufficient with a small amount below this lower limit, and conversely with a large amount exceeding the upper limit undesirably the mechanical properties of the synthetic resin deteriorate significantly. And, it is preferably in the range of 2.0 to 20.0 parts. Further, catalysts such as amines and acid anhydrides may be added to accelerate the reaction.

For mixing the composition of the present invention described above, a conventionally well-known method can be used. For example, the synthetic resin and the above-mentioned components are individually or appropriately dissolved in a solvent (for example, fluorochlorohydrocarbon, etc.) and mixed by a mixer such as a Henschel mixer, a ball mill, a tumbler mixer, and then the solvent is removed. ,
It may be supplied to an injection molding machine or a melt extruder having a good melt-mixing property, or may be melt-mixed by using a heat roller, a kneader, a Banbury mixer, a melt extruder in advance.
Also, when molding the composition of the present invention, the method is not particularly limited, but compression molding, extrusion molding, injection molding and the like are practical, and the composition of the present invention is melted. After mixing, the powder may be pulverized by a jet mill, a freeze pulverizer, or the like, and may be used as it is or as a powder having a desired particle size as a powder coating for fluid immersion coating, electrostatic powder coating, or the like.

In the composition of the present invention, in addition to the above-mentioned lubricating compounding agent, that is, organopolysiloxane, additives that can be widely compounded in general synthetic resins are appropriately used in an amount within a range that does not deteriorate the properties of the lubricating resin composition. You can also Examples of such an additive include a release agent, a flame retardant, a weather resistance improver and the like. These additives are added and compounded at the same time as the lubricating compounding agent of the present invention. It is also possible to adopt a method of blending with lubricity and blendability. Furthermore, it is of course possible to use a conventionally known publicly known lubricant together with the above-mentioned additive, and a tetrafluoroethylene resin powder,
Graphite, graphite fluoride, talc, boron nitride, and other industrial lubricants can be appropriately selected and used according to the purpose of use. Further, glass fiber known as a reinforcing agent, carbon fiber, alumina fiber, asbestos, rock wool, wollastonite, fibrous substances such as potassium titanate whiskers, or an inorganic material represented by glass powder, talc, clay, calcium carbonate or the like. Chamber fillers can also be used. In any case, it is needless to say that the intermediate or final product form can be modified by chemical or physical treatment for property improvement as long as the lubricity of the composition of the present invention is not impaired. .

[Action]

In the lubricating resin composition of the present invention, the epoxy groups of the epoxy group-containing organopolysiloxane react with each other to form a three-dimensional network structure having the organopolysiloxane lubricity in the synthetic resin, and the network thereof is Since they are present in a finely dispersed form, the coefficient of friction is small, and since the lubricating substance stays in the structure without falling off from the base material, the coefficient of friction is maintained stable and the oil does not separate during molding and kneading. . Further, it is considered that the base material is reinforced by the mesh, wear is small, and the mechanical strength is not deteriorated, and all the defects of the conventional oil-impregnated plastic are eliminated.

〔Example〕

First, the raw materials used in the following Examples and Comparative Examples are as follows. The abbreviations are shown in [].

Polyethylene (Mitsui Petrochemical Company; Hijets 1300
J) [PE], 12 nylon (manufactured by Daicel Chemical Industries; Daiamide L1640P)
[PA12], 66 nylon (manufactured by Toray; Amilan CM3001N) [PA6
6], polyacetal (manufactured by Polyplastics Co., Ltd .; Duracon M90-02) [POM], polybutylene terephthalate (manufactured by Mitsubishi Kasei Co., Ltd .; Novadwool 5010) [PBT], polyphenylene sulphate (manufactured by US Phillips Petroleum Co., Ltd.) Ryton P-4 powder) [PPS], polyetherimide (U.S. General Electric Co .; Ultem 1000) [PEI], polyimide resin (Technosimy, West Germany; polyamide bismaleimide C183) [PABM], epoxy group-containing Organopolysiloxane (Shin-Etsu Chemical Co., Ltd .; epoxy modified silicone oil KF102), non-functional organopolysiloxane (Shin-Etsu Chemical Co., Ltd .; silicone oil KF96 3000cst), tertiary amine (N, N-dimethylbenzylamine), is there.

Examples 1 to 20: Synthetic resin was blended with organopolysiloxane as shown in Table 1, thoroughly mixed with Henschel mixer, and then fed to a twin-screw melt extruder, and melt-mixing conditions shown in Table 2 were used. Extruded, granulated, and fed the pellets to an injection molding machine. Under the injection molding conditions shown in Table 2, a ring-shaped test piece with an inner diameter of 14 mm, an outer diameter of 23 mm, and a length of 13 mm and ASTM-D638 type IV A dumbbell test piece was molded. A friction wear test was conducted using a ring-shaped test piece. For the friction test, a thrust type friction tester was used and operation was started at a sliding speed of 10 m / min and a load of 10 kg / cm ^2.
The friction coefficient after 60 minutes and after 60 minutes was measured. For the abrasion test, a thrust type abrasion tester was used and the sliding speed was 32 m / min and the load was 3.1 kg.
It was performed under the condition of / cm ² . Bearing steel was used as the mating material in both tests.
SUJ2 (hardened, ground finish) was used. Also, using dumbbell test pieces, in an atmosphere of 23 ± 2 ° C, distance between check
The tensile strength was determined under the conditions of 64 mm and a pulling speed of 5 mm / min. The result It is summarized in Table 3.

Comparative Examples 1 to 11: Under the compounding compositions, mixing conditions and molding conditions shown in Tables 4 and 5, test pieces similar to those of Examples 1 to 20 were prepared and the same measurements were performed. The results are summarized in Table 6. In Comparative Example 4, the molded body was separated during molding and was non-uniform, and the surface of the mating material after sliding in these Comparative Examples was sticky.

Comparing the above Examples 1 to 20 and Comparative Examples 1 to 11,
As is clear from the measured values shown in Tables 3 and 6, the friction coefficient and the wear coefficient are comparatively small in the comparative examples, but the tensile strength is remarkably lowered (for example, the comparative example 3), or the friction coefficient is decreased. Is not stable (Comparative Example 4), or the friction coefficient and wear coefficient are larger than those of the Examples (Comparative Examples 1, 2, 5-11), but none of them have the expected properties. On the other hand, Examples 1 to 20 all have a low friction coefficient and a low wear coefficient without lowering the tensile strength of the base synthetic resin, and also have good moldability, and do not exhibit the drawbacks of ordinary oleoplastics. It was very favorable. Further, since the object of low friction and low wear is achieved without adding a hard filler which has been widely used in the past, the mating material was not damaged during sliding.

〔effect〕

As described above, the molded body made of the lubricating resin composition of the present invention has excellent sliding properties and good moldability while retaining the original mechanical properties of the synthetic resin. Since it is a material that satisfies all three requirements of slidability, formability, and economic efficiency, it can be said that it is optimal for bearing materials. Therefore, the significance of the present invention is extremely great.

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Claims (1)

[Claims] 1. A synthetic resin comprising 100 parts by weight of 0.5 to 30.0 parts by weight of an organopolysiloxane having a unit containing an epoxy group to form a three-dimensional network structure of the organopolysiloxane in the synthetic resin. A characteristic lubricating resin composition.