JPS62138588A - Lubricant resin composition - Google Patents

Abstract

PURPOSE:To obtain the titled composition satisfying sliding ability, moldability and economy simultaneously, most suitable for bearing materials, etc., by incorporating a synthetic resin with specific amount of an organopolysiloxane having epoxy group contg. unit. CONSTITUTION:The objective composition can be obtained by incorporating (A) 100pts.wt. of a thermosetting or thermoplastic synthetic resin with (B) 0.5-30.0 (pref. 2.0-20.0)pts.wt. of an organopolysiloxane having epoxy group- contg. unit [e.g. of formula (m is 5-10,000; n is 2-100)]. For enhancing the reaction, a catalyst such as amine or acid anhydride may be added.

Description

[Detailed description of the invention] [Industrial application field] This invention relates to a lubricating resin composition.

[Conventional technology]

In recent years, as machines have become lighter, many synthetic resin products have come to be used as machine parts, and synthetic resins with excellent sliding properties are required for bearings.

Conventionally, polyamide, polyacetal, polyethylene, fluororesin, etc. have been used as synthetic resins with good sliding properties. These can function without lubrication at low loads and low speeds, but as the loads and high speeds increase, they seize or flow due to frictional heat, making them unusable. Fluororesins, especially tetrafluoroethylene resins,
Although it exhibits excellent sliding properties by adding fillers to improve wear properties, it has the disadvantage that it can only be molded by compression molding and is very expensive. Therefore, measures have been taken to improve the sliding characteristics by adding solid lubricants to other synthetic resins, but this method does not sufficiently improve the sliding characteristics under high speed and high loads. In addition, in order to solve the above problem, there is a method of adding lubricating oil to synthetic resin to make it a so-called oil-impregnated plastic.The specific methods are: 1) simply mixing lubricating oil into the resin, 2) being able to retain lubricating oil. Add carrier together with lubricating oil, 3) above 1)
In addition to 2), fibrous fillers may be added as oil conductors. These oil-impregnated plastics are intended to have sliding properties by leaching lubricating oil, but (1) the coefficient of friction is low and unstable;
(2) Oil leaks out when heated; (3) moldability is poor; (4) the carrier scrapes the mating material during sliding; (5)
Oil tends to separate during molding or kneading, (6) material properties deteriorate, (7) sliding surfaces tend to get oil and dust, and (8) abnormal wear occurs once the oil runs out. There were various problems.

[Problem that the invention seeks to solve]

As mentioned above, in the conventional technology, the friction coefficient is stable at a low value, the wear coefficient is small, and the mechanical properties (
In particular, it is not possible to obtain a material that does not cause a decrease in strength, etc., and even synthetic resins that have 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 proposes a synthetic resin 1
0.5 to 3 parts of organopolysiloxane having a unit containing a glycidyl group per 00 parts (parts are parts by weight, the same applies hereinafter)
This method adopts a method of blending 0.0 part of the resin composition to form a lubricating resin composition. The details are given below.

First, the synthetic resin in this invention is not particularly limited, and may be either thermosetting or thermoplastic resin, such as phenol resin, urea resin, melamine resin, melamine-phenol cocondensation resin. , xylene-modified phenolic resin, urea-guanamine cocondensation resin, amino resin, acetoguanamine resin, melamine amine resin, polyester resin, diallyl phthalate resin, xylene resin, epoxy resin, eboxy arylate resin, silicone resin, urethane resin, polytetra Fluoroethylene, chlorotrifluoroethylene resin,
Tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkyl vinyl ether copolymer, vinylidene fluoride resin, ethylene-tetrafluoroethylene copolymer, ethylene-
Chlorofluoroethylene copolymer, vinyl chloride resin, vinylidene chloride resin, polyethylene (low density, high density, ultra-high molecular weight), chlorinated polyolefin, polypropylene,
Modified polyolefin, water-crosslinked polyolefin, ethylene-vinyl acetate copolymer, ethylene-ethyl acrylate copolymer, polystyrene, ABS resin, polyamide, methacrylic resin, polyacetal, polycarbonate, cellulose resin, polyvinyl alcohol, polyurethane elastomer, polyimide, poly Etherimide, polyamideimide, ionomer resin, polyphenylene oxide, methylpentene polymer, polyallyl sulfone, polyallyl ether, polyether ketone, polyphenylene sulfide, polysulfone, fully aromatic polyester, polyethylene terephthalate, polybutylene terephthalate, thermoplastic polyester elastomer, Examples include blends of various polymeric substances.

Next, the organopolysiloxane having a unit containing a glycidyl group in this invention is dimethylsiloxane,
A glycidyl group is introduced into a homopolymer or a copolymer of two or more organopolysiloxanes such as methylphenylsiloxane and trimethylfluoropropylsiloxane, for example [where m = 5 to 10,000, n = 2 to It is 100. ] etc.

In this invention, the reason why 0.5 to 30.0 parts of organopolysiloxane having a unit containing a glycidyl group is added to 100 parts of the synthetic resin is that a small amount below this lower limit has no effect on improving sliding properties. is insufficient, and conversely, if the amount exceeds the upper limit, the mechanical properties of the synthetic resin will significantly deteriorate, which is undesirable.
The range is 20.0 parts. Additionally, a catalyst such as amines or acid anhydrides may be added to promote the reaction.

Conventionally well-known methods can be used to mix the composition of the present invention described above. For example, the synthetic resin and the above-mentioned compounded components may be mixed individually or with an appropriate solvent (
For example, fluorochlorohydrocarbon, etc.) and mix it with a Henschel mixer, ball mill, or tumbler.
After mixing with a mixer such as a mixer, remove the solvent and supply to an injection molding machine or melt extruder with good melt-mixing properties, or use a heated roller, kneader, Banbury mixer 1 melt extruder, etc. in advance. They may be melt-mixed. Furthermore, the method for molding the composition of the present invention is not particularly limited, but practical methods include compression molding, extrusion molding, and injection molding. After that, the powder is pulverized using a jet mill, a freezing pulverizer, etc., and the powder can be used as it is or after being classified into a desired particle size as a powder coating for fluidized dip coating, electrostatic powder coating, etc.

In addition to the above-mentioned lubricating compounding agent, i.e., organopolysiloxane, the composition of the present invention contains additives that can be widely incorporated into general synthetic resins, in an amount that does not reduce the properties of the lubricating resin composition. You can also do that. Examples of such additives include mold release agents, flame retardants, weather resistance improvers, etc. These additives are added and blended at the same time as the lubricating compound of the present invention, but they are not mixed with the additives in advance. It is also possible to adopt a method of blending with a lubricating compounding agent.

Furthermore, it is of course possible to use conventionally known and publicly used lubricants in combination with the above additives, such as tetrafluoroethylene resin powder, graphite, graphite fluoride, talc, boron nitride,
Other industrial lubricants can also be selected and used as appropriate depending on the purpose of use.

In addition, glass fiber, carbon fiber, which is known as a reinforcing agent,
Fibrous materials such as alumina fibers, asbestos, rock wool, wollastonite, potassium titanate whiskers,
Alternatively, inorganic fillers such as glass powder, talc, clay, calcium carbonate, etc. can also be used. In any case, it is of course possible to modify the intermediate or final product to improve its properties by chemical or physical treatment, as long as the lubricity of the composition of the present invention is not impaired.

[Effect]

In the lubricating resin composition of the present invention, the glycidyl groups of the glycidyl group-containing organopolysiloxane react with each other to form a three-dimensional network structure with lubricating properties of the organopolysiloxane in the synthetic resin. Because it is finely dispersed, the coefficient of friction is small, and since the lubricating substance remains within the tissue without being extracted from the base material, the coefficient of friction is maintained stably, and the network reinforces the base material. It is thought that all the drawbacks of conventional oil-impregnated plastics will be eliminated, resulting in less wear and no decrease in mechanical strength.

〔Example〕

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

■Polyethylene (manufactured by Mikata Petrochemical Co., Ltd.; Hi-Zex x3
00J) CPII-1, ■12 nylon (manufactured by Daicel Chemical Co., Ltd.; Diamid L16
40P) CPA12], ■66 nylon (manufactured by Toshisha; Amiran CM 3 Qol
N) (:PA66), ■Polyacetal (manufactured by Polyplastics; Duracon M9o-o2) CPOMI, ■Polybutylene terephthalate (manufactured by Mitsubishi Chemical Industries, Ltd.; Novad Wool 501o) [
PBT], ■Polyphenylene sulfide (manufactured by Phillips Hetroleum, USA; Rydon p-4 powder)
(PPS), ■Polyetherimide (manufactured by General Electric Co., USA: Ultem 1000) (PEII), ■Polyimide resin (manufactured by Technosimy, West Germany; Polyamide Bismaleimide C183) [:PABM), ■Glycidyl group-containing organopolysiloxane (Shin-Etsu Epoxy-modified silicone oil KF102 (manufactured by Kagaku Kogyo Co., Ltd.), [Phase] Unfunctional organopolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd.: Silicone oil KF96 3000cst)
, (1) Tertiary amine (N,N-dimethylbenzylamine).

Examples 1 to 20: Organopolysiloxanes were blended with synthetic resins as shown in Table 1, thoroughly mixed in a Henschel mixer, then fed to a twin-screw melt extruder and mixed under the melt mixing conditions shown in Table 2. After extrusion and granulation, the pellets were fed to an injection molding machine, and the injection molding conditions shown in Table 2 were used to form a mold with an inner diameter of 14 mm and an outer diameter of 2 mm.
A ring-shaped test piece with a length of 3 mr + 1 and a length of 13 Inm, and an AS
A dumbbell test piece of TM-D638 type (■) was molded.

Friction and wear tests were conducted using ring-shaped test pieces. The friction test uses 16 machines for thrust type friction at a sliding speed of 10 per minute.
The coefficient of friction was measured 1 minute after the start of operation and 60 minutes after the start of operation under the conditions of 1 min and a load of 1Q kg/cm2. The wear test was carried out using a thrust type wear tester at a sliding speed of 32 m/min and a load of 3.1
The test was conducted under the condition of kg/cm2. In both tests, bearing steel 5LJJ2 (quenched and ground finished) was used as the mating material. In addition, using a dumbbell test piece, the distance between chucks was 54 mm, and the pulling speed was 5 r/min in an atmosphere of 23 ± 2°C.
The tensile strength was determined under am condition. The results are summarized in Table 1, Table 2, Table 3, and Table 3.

Comparative Examples 1 to 11: Test pieces similar to Examples 1 to 20 were prepared using the compounding composition, mixing conditions, and molding conditions shown in Tables 4 and 5, and
Similar measurements were made. 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 in these Comparative Examples after sliding was sticky.

Comparing Examples 1 to 20 and Comparative Examples 1 to 11 shown in Table 5 and above, it is clear from the measured values shown in Tables 3 and 6 that the friction coefficient and wear coefficient of the comparative examples are comparable. However, the tensile strength is significantly reduced (for example, Comparative Example 3), the friction coefficient is unstable (Comparative Example 4), or the friction coefficient and wear coefficient are larger than those of the Examples (Comparative Examples 1 and 2). 5 to 11) in Table 6, and the expected properties were not obtained in any of them. On the other hand, Examples 1 to 20 all have small friction coefficients and wear coefficients without reducing the tensile strength of the base synthetic resin, have good moldability, and do not exhibit the drawbacks of ordinary oil-containing plastics. , which was extremely favorable.

Furthermore, since the objective of low friction and low wear is achieved without adding hard fillers that have been widely used in the past, there is no damage to the mating material during sliding.

〔effect〕

As described above, the molded article made of the lubricating resin composition of the present invention retains the mechanical properties inherent to synthetic resins, has excellent sliding properties, and has good moldability, compared to conventional Because it is a material that simultaneously satisfies the characteristics of slidability, formability, and economic efficiency that have never been possible before, it can be said to be optimal for bearing materials. Therefore, the significance of this invention is extremely large.

Patent applicant Yobea Rulon Industrial Co., Ltd. Agent Kama 1) Text 2 Procedural amendment (target)

Claims (1)

[Claims] A lubricating resin composition characterized in that 0.5 to 30.0 parts by weight of an organopolysiloxane having a unit containing a glycidyl group is blended with 100 parts by weight of a synthetic resin.