JPS59179662A - Oil-containing synthetic resin composition - Google Patents

Abstract

PURPOSE:To provide an oil-contg. synthetic resin compsn. having good moldability and suitable for use in the production of sliding members having excellent frictional and wear characteristics and mechanical strength, by blending specified quantities of lubricating oil, polynorbornene elastomer, mica and a solid lubricant. CONSTITUTION:100pts.wt. synthetic resin such as polyarylate, polyacetal or polycarbonate, 5-30pts.wt. lubricating oil such as spindle oil or silicone oil, 1.2- 15pts.wt. polynorbornene elastomer such as Norsolex (a product of Nippon Zeon K.K.), 5-30pts.wt. mica having a particle size of 100 mesh and an aspect ratio of 10 or above and 5-30pts.wt. solid lubricant such as graphite or tetrafluoroethylene resin are mixed together with the proviso that the combined quantity of mica and the solid lubricant is not more than 50pts.wt.

Description

[Detailed description of the invention] The present invention relates to an oil-containing synthetic resin composition.

In general, sliding materials 1 For example, members with sliding surfaces on which wires, shafts, etc. slide, such as wire guides and bearings in dot printers, are often used under harsh conditions, so their durability becomes a problem. For example, in the case of the above-mentioned wire guide, due to the increase in speed of printers in recent years, the wire is
The reciprocating motion is performed about 500 to 1000 times per second with a stroke of about 1.51, but the amount of wear and displacement during the reciprocating motion of several tens of positions is required to be about 0.1 or less.

In response to this, various synthetic resin compositions have been studied as materials for the wire guide, and the following materials have been put into practical use.

(1) Glass fiber reinforced aromatic polyamide resin (2)
Glass fiber reinforced polyphenylene sulfide resin (3) Polyimide resin (4) Polyamideimide resin Regarding (1) and (2) above, the materials themselves do not have self-lubricating properties, so they are used while supplying lubricating oil to the wire. Even if oil is supplied, it is difficult to form an oil film because the wire is reciprocating at high speed, and fretting corrosion (
There are problems in that it is easy to cause scratch corrosion) and has low wear resistance. On the other hand, regarding (3) and (4) above, although these materials are attracting attention as super heat-resistant and high-strength engineering plastics5, they are expensive and have difficulties in molding processability. Because it scatters,
There arises not only a problem regarding the amount of wear displacement, but also the problem of staining of surrounding members etc. due to wear particles.

In view of this point, the present invention provides lubricating oil and lubricating oil for the three synthetic resins.
Contains appropriate amounts of polynorbornene elastomer, solid lubricant, and mica to improve friction.

Improvement in wear characteristics 1 An oil-containing synthetic resin composition with improved mechanical strength and moldability is provided.

1. The oil-containing synthetic resin composition according to the present invention contains 5 to 30 parts by weight of lubricating oil based on 100 parts by weight of the synthetic resin.
1.2 to 15 parts by weight of polynorbornene elastomer as a carrier for this lubricating oil.

Furthermore, 5 to 30 parts by weight of mica and 5 to 30 parts by weight of solid lubricant.
Parts by weight Parts by weight, and mica and solid/li!
The total amount of the lubricant and lubricant is set within a range not exceeding 50 parts by weight.

"Double synthetic resins are the basic materials for oil-containing synthetic resin compositions, including polyarylates and polyacetals.

Polyamide, polyethylene terephthalate, polypropylene, polyethylene, polysulfone, polycarbonate, etc., which have self-lubricating properties and have poor abrasion resistance, are used.

As for lubricating oil, spindle oil and Turbinura are used.

Aromatic lubricating oils such as machine oil and dynamo oil, naphthenic lubricating oils, paraffinic lubricating oils, or hydrocarbons.

Commonly used lubricating oils are used, such as synthetic oils such as esters, polyglycols, and silicones. This lubricating oil contains 5 to 30 parts by weight per 100 parts by weight of the synthetic resin, but if 5 parts by weight is uncrystallized, sufficient Ni properties cannot be exhibited.

If it exceeds 30 parts by weight, there is a problem that the mechanical strength of the synthetic resin is significantly reduced.

Since polynorbornene elastomer has an extremely porous structure, it can absorb a large amount of lubricating oil and acts as a lubricating oil carrier. The polynorbornene elastomer is blended in 1.2 to 15 parts by weight per 100 parts by weight of the synthetic resin, but if it is less than 1.2 parts by weight (f7J<24% by weight relative to the amount of lubricating oil), Bleeding occurs and there are defects without adversely affecting molding processability.
Moreover, if the amount exceeds 15 parts by weight (if the proportion to the amount of lubricating oil exceeds 50% by weight), it will have a negative effect on the friction characteristics and wear characteristics, and will not have a negative effect on the appearance of the molded product, causing problems.

Mica acts as a reinforcing agent and is present in an amount of 5 to 30 parts by weight per 100 parts by weight of the 2 synthetic resin, but if it is less than 5 parts by weight, a sufficient reinforcing effect cannot be obtained.

Moreover, if the amount exceeds 30 parts by weight, there is a problem that the friction characteristics and wear characteristics are adversely affected. From the viewpoint of reinforcement, this mica preferably has an aspect ratio of 10 or more. In addition, the size of mica is about 100 mesosh, that is, 45 to 4
Approximately 6μ is preferable.

If the gap is larger than this, it will be difficult to knead, and if the gap is too small, sufficient strength will not be obtained.

The solid lubricant has the effect of increasing lubricity in combination with the lubricating oil, and graphite, molybdenum disulfide, ethylene tetrafluoride resin, etc. are used as the solid lubricant. This solid lubricant contains 5 to 30 parts by weight per 100 parts of synthetic resin, but if it is less than 5 parts by weight, the lubricity cannot be sufficiently improved, and if it exceeds 30 parts by weight, it will not lubricate. Not only can you not expect much improvement in properties, but you also have the problem that the molded product becomes brittle and difficult to process. Note that graphite is natural graphite (scaly).

Scale-like, bead-like) 2 artificial graphite is used, and the solid lubricant has dispersibility and /r! In order to improve the '/lt properties, the particle size is made as fine as possible.

The combined amount of mica and solid lubricant is set at 50 parts by weight or less per 100 parts by weight of the synthetic resin, but if it exceeds 50 parts by weight, mica and solid lubricant may be mixed together. Even if the amount of each of the rJI lubricants is below the upper limit of 30 parts by weight, there are problems in that the molded product becomes brittle and the molding process becomes difficult.

Next, an example of a sliding material to which the oil-containing synthetic resin composition according to the present invention is applied will be explained based on FIG.

This example relates to a dot printer 1.

In this printer 1, 2 is a platen, 3 is a printing medium wound around the platen 2, 4 is a printing wire, the printing wire 4 is slidably supported by printing wire guides 5, 5, and the platen is moved by a driving means 6. Slide back and forth toward 2,
Printing is performed on the print medium 3 via the ink ribbon 7.

The drive means 6 is a swinging lever in the shape of a letter 8 and 5, and has a pivot portion 9 at its central bent portion, and one end thereof is connected to the printing wire 4 via an end plate 10. This swing lever 8
is urged in a direction to return the printing wire 4 by a return spring 11, and is made to swing in a direction to push the printing wire 4 against the urging force of the return spring 11 by excitation of an electromagnet 12. Note that 13 is a pressure expansion spring, and 14 is a stopper.

The printing wire guide 5 is molded from the oil-containing synthetic resin composition according to the present invention, and has a printing wire stroke of 0.5 to 1. -5+m, reciprocating speed 500~10
The amount of wear displacement of the printing wire guide 5 under the usage conditions of 00 reciprocations/second and several tens of reciprocations is 0.1+IiI
The following is true.

Next, two examples of the present invention will be described based on a comparative test with a comparative example.

<Example> The blending ratios in this example are as follows.

Polyarylate resin 100 parts by weight (A X 1500-5 manufactured by Unitika) Lubricating oil
15 parts by weight (Daphne Mechanic Oil #100 manufactured by Idemitsu Kosan Co., Ltd.) Polynorbornene elastomer 4 parts by weight (Northoresox manufactured by Nippon Zeon Co., Ltd.) Mica 20 parts by weight (Susolite Mica 200HK manufactured by Kuraray Co., Ltd.) Tetrafluoroethylene resin 10 parts by weight Test To manufacture the pieces, lubricating oil and polynorbornene elastomer were subjected to an oil extension treatment at 80°C for 3 hours, and this was made into polyarylate resin.

After mixing with mica and tetrafluoroethylene resin in a Henschel mixer, the pellets were kneaded and pelletized in an extruder, and the pellets were molded into a predetermined test piece shape using an injection molding machine.

<Comparative example 1> The blending ratios in this example are as follows.

Boria Relay B1 fat 100 parts by weight (Unitika HA x 1500-s) Lubricating oil
15 parts by weight (150 spindle oil special No. 2) Polynorbornene elastomer 4 parts by weight (Northoresox manufactured by Zeon Corporation) Mica 2o if 9B (
Comparative Example 2> The blending ratio of this example is as follows.

Polyarylate resin ioo parts by weight (Unitika A x 1500-3) Lubricating oil
15 parts by weight (150 spindle oil <Special No. 2>)
) Polynorbornene elastomer 4 parts by weight (Norsolenx manufactured by Nippon Seon Co., Ltd.) In producing the test pieces, the same method as in Examples was used for both Comparative Examples 1 and 2.

Test 1 This test measures the friction coefficient and wear coefficient by a journal test. That is, the sample material has an inner diameter of 8mm and an outer diameter of 1211mm. A cylindrical body with a length of 10 mm is fitted with a shaft, and a weight of 5 kg is applied in the vertical direction of the shaft.
The shaft is moved 20 m/cl with a load of
It was rotated at a speed of min. The material of the shaft is 345C
The surface roughness is 3S and the 7 clearance is 30μ.

Test 2 The mode of this test is shown in Figure 2. In other words, in the same figure, 24.24 is a medium 5-piece test piece, and a SKH wire 25 with a diameter of 0.351 is placed between the two test pieces 24.24 and crimped. 600 tlz in one fin stroke by solenoid 26
Amount of wear displacement of test piece 24 after 2 hours (dragon)
was measured.

The results of Tests 1 and 2 above are shown in the following table.

In the above table, the examples show lower values than the comparative examples in terms of friction coefficient, wear coefficient, and wear displacement, and the addition of mica and solid/rlI lubricant improves friction and wear characteristics. It can be seen that it has a great effect on

In this case, the synergistic effect of the solid lubricant exposed on the sliding surface of the test piece and the lubricant oil supplied to this sliding surface from inside the test piece results in extremely good ia lubricity of the sliding surface. It is recognized that excellent friction and wear characteristics were obtained.

When graphite or molybdenum disulfide is used as a solid ISL agent, the friction and wear characteristics are slightly inferior to those of tetrafluoroethylene resin, but graphite and molybdenum disulfide, together with lubricating oil, reduce the coefficient of friction. It has a great effect on the decline.

Furthermore, in Tests 1 and 2 above, no scattering of abrasion powder or melting due to frictional heat of the test piece was observed in the test piece of the example.

Incidentally, 1. The oil-containing synthetic resin composition according to the present invention can be used for other sliding materials other than printed wire guides 2. For example, bearings.

Of course, it can also be applied to pulley 2 gears, sealing materials, sliding plates, etc.

As described above, according to the present invention, frictional characteristics, wear characteristics, and heat resistance are improved by blending predetermined amounts of lubricating oil, 5 mica of polynorbornene elastomer, and a solid lubricant into a synthetic resin. Furthermore, it is possible to obtain a sliding agent that has excellent properties and high mechanical strength.

In addition to improving moldability, it also prevents the generation of abrasion powder when used as a sliding lever.

An excellent effect can be obtained in that the manufacturing cost of the molded product can be reduced.

[Brief explanation of drawings]

FIG. 1 is a sectional view showing a part of a dot printer. FIG. 2 is a side view showing an aspect of Test 2. 1... Dot printer, 2... Platen, 3... Printing medium, 4... Printing wire, 5... Printing wire guide, 6 ... Drive means, 7 rivers... Ink rib: /, 21.24...
...Test piece, 22. Wire for 25..., 23
... Cap 26-, Solenoid 1 Leap 2 (C08L 101100 911006958-4J 65100) 7342-4
J (C08L 101100 1100 5100 27718) 0 Inventor Tomokin Terukumoriguchi Type Keihan Hondori 1 Lower 26-2-09

Claims (1)

[Claims] (1) The proportion of lubricating oil to 100 parts by weight of synthetic resin is 5 to 30 parts by weight, and 1 part by weight of polynorbornene elastomer.
．． 2 to 15 parts by weight, mica to 5 to 30 parts by weight, and solid lubricant to 5 to 30 parts by weight. An oil-containing synthetic resin composition, characterized in that the total amount of mica and solid lubricant does not exceed 50 parts by weight.