JP2644466B2 - Method for producing lubricating resin molded article - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a lubricating resin molded article.
It relates to a manufacturing method . 2. Description of the Related Art In recent years, as the weight of machines has been reduced, many synthetic resin products have been used as mechanical parts, and synthetic resins having excellent sliding properties have been required for bearings. ing. Conventionally, polyamide, polyacetal, polyethylene, fluororesin and the like have been used as synthetic resins having good slidability. [0003] These can be used even in the low-load, low-speed range even without lubrication. However, as the load becomes higher and the speed increases, seizure or flow occurs due to frictional heat, and the use becomes impossible. [0004] Fluororesins, especially ethylene tetrafluoride, exhibit excellent sliding properties by adding a filler to improve wear properties, but can be formed only by compression molding and are very expensive. Has the disadvantage that In order to improve the sliding characteristics by adding a solid lubricant to other synthetic resins, this method is not enough to improve the sliding characteristics under high speed and high load. . In order to solve the above-mentioned problems, there is a method of adding a lubricating oil to a synthetic resin to produce a so-called oil-impregnated plastic. Specific methods include 1) simply mixing the lubricating oil into the resin, and 2) lubricating the resin. A carrier capable of holding oil is added together with the lubricating oil. 3) In addition to the above 1) and 2), a fibrous filler may be added as an oil conductor. [0007] Such oil-impregnated plastics are intended to have a sliding property by leaching lubricating oil. However, (1) the friction coefficient is not stable at a low value, (2)
Oil oozes out when heated, (3) poor moldability,
(4) The carrier cuts off the mating material during sliding, (5) Oil is easily separated during molding or kneading, (6) Material properties are reduced, (7) Oil is attached to the sliding surface, etc. (8) Once the oil runs out, there are various problems such as abnormal wear. [0008] As described above,
In the prior art, a molded body made of a material that is stable at a low friction coefficient, has a small wear coefficient, and does not cause a decrease in mechanical properties (particularly strength) cannot be obtained. The synthetic resin has a problem that it is not suitable for a sliding material that requires low friction and wear resistance. In order to solve the above problems, the present invention comprises an isocyanate group or a cyanate group per 100 parts (parts by weight, hereinafter the same) of a synthetic resin. Organopolysiloxane having units
5 to 30.0 parts are melt-mixed and this mixture is molded.
Thus, a method for producing a lubricating resin molded article comprising: Or, based on 100 parts of synthetic resin, isocyanate
Having a unit containing a cyano group or a cyanate group
Extrusion of 0.5 to 30.0 parts of siloxane in a melt-mixed state
Lubricating resin molding consisting of granulating and molding
It was a method of manufacturing the body. The details are described below. First, the synthetic resin in the present invention is not particularly limited, and may be either a thermosetting resin or a thermoplastic resin.
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, tetrafluoroethylene-hexafluoropropylene copolymer, tetrafluoroethylene-perfluoroalkylvinyl ether copolymer, vinylidene fluoride resin, ethylene-tetrafluoro Ethylene copolymer, ethylene-chlorofluoroethylene copolymer, vinyl chloride resin, vinylidene chloride resin, polyethylene (low density, high density or ultra high polymer ), Chlorinated polyolefin, 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,
Examples include polyallyl sulfone, polyallyl ether, polyether ketone, polyphenylene sulfide, polysulfone, wholly aromatic polyester, polyethylene terephthalate, polybutylene terephthalate, thermoplastic polyester elastomer, and blends of various polymer substances. Next, the organopolysiloxane having a unit containing an isocyanate group or a cyanate group in the present invention may be a homopolymer of organopolysiloxane such as dimethylsiloxane, methylphenylsiloxane or trimethylfluoropropylsiloxane, or a copolymer of two or more thereof. An isocyanate group or a cyanate group is introduced into a polymer, and examples thereof are as follows. That is, an isocyanate group-containing organopolysiloxane Cyanate group-containing organopolysiloxane Wherein R is an alkylene group or the like, m = 5-1.
0000, n = 2-100. ]. Here, in the present invention, the synthetic resin 100
Parts by weight of an organopolysiloxane having a unit containing an isocyanate group or a cyanate group in an amount of 0.5 to 3 parts by weight.
The reason for adding 0.0 parts is that if the amount is less than the lower limit, the effect of improving the sliding characteristics is insufficient, and if the amount exceeds the upper limit, the mechanical properties of the synthetic resin are significantly reduced, which is not preferable. And preferably in the range of 2.0 to 20.0 parts. In order to promote the reaction, it is preferable to add a trimerization catalyst such as calcium acetate and tin compound. To mix the above-mentioned materials used in the present invention, 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 (eg, fluorochlorohydrocarbon), mixed by a mixer such as a Henschel mixer, a ball mill, a tumbler mixer, and then the solvent is removed. The mixture may be supplied to an injection molding machine or a melt extruder having good mixing properties, or may be melt-mixed in advance using a hot roller, a kneader, a Banbury mixer, a melt extruder, or the like. In molding a molded article by the production method of the present invention, the method is not particularly limited, but compression molding, extrusion molding, injection molding and the like are practical. After melt-mixing the composition of the present invention, it is pulverized by a jet mill, a freezing pulverizer, or the like, and the powder as it is or classified into a desired particle size is used as a powder coating for fluid immersion coating, electrostatic powder coating, or the like. Can also. In the production method of the present invention, in addition to the above-mentioned lubricating compound, that is, the organopolysiloxane, an additive which can be generally compounded widely in a synthetic resin is added in an amount which does not deteriorate the properties of the lubricating resin composition. Can be used in combination as appropriate. Examples of such additives include release agents, flame retardants, and weather resistance improvers. These additives are added and compounded simultaneously with the lubricating compound of the present invention. And a lubricating compounding agent. Further, it is of course possible to use well-known lubricants in combination with the above-mentioned additives. For example, ethylene tetrafluoride resin powder, graphite, graphite fluoride, talc, boron nitride,
In addition, industrial lubricants and the like can be appropriately selected and used according to the purpose of use. In addition, known glass fibers as reinforcing agents, carbon fibers, alumina fibers, asbestos,
Fibrous substances such as rock wool, wollastonite, potassium titanate whiskers, or glass powder, talc,
Inorganic fillers such as clay and calcium carbonate can also be used. In any case, as long as the lubricating property of the molded article obtained by the present invention is not impaired, the form of the intermediate product or the final product can be modified by chemical or physical treatment to improve properties. Of course. According to the method for producing a lubricating resin molded article of the present invention, when the lubricating resin molded article is melt-mixed and molded,
The functional groups of the organopolysiloxanes contained in the polymer are trimerized to form a three-dimensional network having the lubricity of the organopolysiloxane in the synthetic resin. becomes small and the lubricating material remains within tissue without slipping off from the substrate, the coefficient of friction is maintained stably, and also reduction of small mechanical strength wear substrate is reinforced by a mesh < br /> will not be considered as a disadvantage of the conventional oil-impregnated plastic Ru can manufacture all eliminate the moldings. EXAMPLES First, raw materials used in the following examples and comparative examples are as follows. The abbreviations are shown in []. (1) Polyethylene (manufactured by Mitsui Petrochemical Co., Ltd .; Hizex 1300J) [PE], (2) 12 nylon (manufactured by Daicel Chemical Co., Ltd .; diamide L1640P) [PA
12], (3) 66 nylon (manufactured by Toray Industries; Amilan CM3)
001N) [PA66], (4) Polyacetal (manufactured by Polyplastics; Duracon M90-02) [PO
M], (5) Polybutylene terephthalate (manufactured by Mitsubishi Kasei Kogyo; Novadwool 5010) [PBT], (6) Polyphenylene sulfide (manufactured by Philip Spetrolium, USA; Ryton P-4 powder) [PPS], (7) Polyetherimide (manufactured by General Electric Company, USA;
ULTEM 1000) [PEI], (8) Polyimide resin (manufactured by Westin Germany Technosimie; polyamide bismaleimide C183) [PABM], (9) Isocyanate group-containing organopolysiloxane (Shin-Etsu Chemical Co., Ltd. X22-160C (molecular weight 56
00) 56 g and 2,4-toluene diisocyanate
(10) Nonfunctional organopolysiloxane (manufactured by Shin-Etsu Chemical Co., Ltd .; silicone oil KF96 3000), and (11) a tin compound (dibutyltin dilaurate). Examples 1 to 10: An organopolysiloxane was mixed with a synthetic resin as shown in Table 1 and thoroughly mixed with a Henschel mixer. The mixture was supplied to a twin-screw extruder and melt-mixed as shown in Table 2. Extruded under the conditions, granulated, and the pellets were supplied to an injection molding machine. Under the injection conditions shown in Table 2, a ring-shaped test piece having an inner diameter of 14 mm, an outer diameter of 23 mm, and a length of 13 mm, and an ASTM-D638 type IV Dumbbell specimens were formed. A friction and wear test was performed using the ring-shaped test piece. In the friction test, a friction coefficient was measured 1 minute and 60 minutes after the start of operation by using a thrust type friction tester under the conditions of a sliding speed of 10 m / min and a load of 10 kg / cm ² . The abrasion test was carried out using a thrust type abrasion tester at a sliding speed of 32 m / min.
The test was performed under a load of 3.1 kg / cm ² . In all tests, the bearing material is SUJ2 (hardened, ground finish)
It was used. Using a dumbbell test piece, in an atmosphere of 23 ± 2 ° C., a distance between chucks of 64 mm, and a pulling speed of 5 min / min.
The tensile strength was determined under the condition of mm. The results are summarized in Table 3. [Table 1] [Table 2] [Table 3] Comparative Examples 1 to 11: Examples 1 to 10 were prepared under the blending compositions, mixing conditions and molding conditions shown in Tables 4 and 5.
A test piece similar to the above was prepared, and the same measurement was performed. The results are summarized in Table 6. In Comparative Example 4, the molded articles were separated during molding and were non-uniform, and the surfaces of the mating members after sliding in these Comparative Examples were sticky. [Table 4] [Table 5] [Table 6] Examples 1 to 10 and Comparative Examples 1 to 1
In comparison with No. 1, as is clear from the measured values shown in Tables 3 and 6, in the comparative example, the friction coefficient and the wear coefficient were relatively small, but the tensile strength was significantly reduced (for example, Comparative Example 3). , Friction coefficient is not stable (Comparative Example 4)
Also, the friction coefficient and the wear coefficient are larger than those of the examples (Comparative Examples 1, 2, 5 to 11), and none of them has the expected properties. On the other hand, all of Examples 1 to 10 have a small coefficient of friction and a small coefficient of abrasion without lowering the tensile strength, have good moldability, and do not exhibit the drawbacks of ordinary oil-containing plastics. It was preferable. Further, since the purpose of low friction and low wear is achieved without adding a hard filler which has been widely used in the past, there was no damage to the mating material during sliding. As described above, the method for producing a molded article comprising the lubricating resin composition of the present invention is based on an organopolysiloxane.
Lubricating resin composition in a state where the resin is dispersed in the synthetic resin.
The product has a stable low coefficient of friction while retaining the original mechanical properties of synthetic resin , and has excellent wear resistance.
It has a sliding property with a sliding resistance which could not be seen past, formed to satisfy formability and economy tripartite simultaneously
It is a method that can produce a shape, and has the advantage that it can provide the most suitable bearing material and the like.
You.

Claims (1)

(57) (Claims) (1) To 100 parts by weight of a synthetic resin, 0.5 to 30.0 parts by weight of an organopolysiloxane having a unit containing an isocyanate group or a cyanate group is melt-mixed, and this mixture is mixed. A method for producing a lubricating resin molded article, which comprises molding. (2) The method according to claim 1, wherein the molding is extrusion molding or injection molding. (3) The method according to claim 1, wherein the synthetic resin is a thermoplastic synthetic resin. (4) The synthetic resin is polyethylene, polyamide,
2. The method for producing a lubricating resin molded product according to claim 1, wherein the resin is at least one synthetic resin selected from the group consisting of polyacetal, polybutylene terephthalate, polyphenylene sulfide, polyetherimide, and polyimide. (5) The molded article is a bearing.
The method for producing a lubricating resin molded article according to the above item. (6) 0.5 to 30.0 parts by weight of an organopolysiloxane having a unit containing an isocyanate group or a cyanate group is extruded in a melt-mixed state with respect to 100 parts by weight of a synthetic resin, and granulated, and then molded. A method for producing a lubricating resin molded article. (7) The method according to claim 6, wherein the molding is extrusion molding or injection molding. (8) The method according to claim 6, wherein the synthetic resin is a thermoplastic synthetic resin. (9) The synthetic resin is polyethylene, polyamide,
7. The method for producing a lubricating resin molded product according to claim 6, wherein the resin is at least one synthetic resin selected from the group consisting of polyacetal, polybutylene terephthalate, polyphenylene sulfide, polyetherimide, and polyimide. (10) The method for producing a lubricating resin molded product according to claim 6, wherein the molded product is a bearing.