JP3330400B2 - Abrasion resistant resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a polyphenylene sulfide resin having a mechanical strength, dimensional accuracy, heat resistance and excellent wear resistance, which is suitable for sliding parts in the field of automobiles and precision OA. This is referred to as a PPS) composition, specifically, a composition containing PPS, a specific glass fiber, and a specific glass flake.

[0002]

2. Description of the Related Art Conventionally, sliding parts made of synthetic resin are superior to metal parts in the following points, and are therefore molded using resins such as polyacetal (POM) and polyamide (PA). . That is, the general advantages of the synthetic resin sliding parts are (a) low noise and vibration absorption (b).
It has excellent self-lubricating properties and can be operated for a long time without lubrication. (C) Lighter weight can be achieved. (D) Mass production can be reduced by mass production by injection molding. (E) Parts with complicated shapes can be easily manufactured. (F) Rust prevention treatment is not required unlike a metal material.

In contrast to the above advantages, the conventional synthetic resin sliding parts have the following disadvantages. That is, (a) heat resistance is far inferior to metal sliding parts, (b) mechanical strength is low, and it is unsuitable for parts to which large stress is applied. (C) Metal made by machining (cutting, grinding) (D) The performance of some materials, such as sliding parts, which is difficult to obtain with high precision depends on the surrounding environment such as high hygroscopicity and insufficient chemical resistance. Among them, chemical resistance is important, and if it is insufficient, grease and lubricating oil cannot be used.

As a method for solving the above-mentioned drawbacks, use of PPS as a material for plastic sliding parts has been studied.

[0005] PPS is an engineering plastic excellent in heat resistance and chemical resistance. However, resin alone has low strength and is brittle, so that it is usually reinforced with reinforcing fibers or the like. The PPS thus obtained has improved mechanical strength, dimensional stability, rigidity, etc. in addition to the conventional performance.
It is applied to the fields of automobiles, electric and electronic fields, and the like. However, when they are used as a sliding member, it is not suitable to simply include reinforcing fibers, because the abrasion of the mating member increases. For this reason, many of these compositions use a lubricant, particularly polytetrafluoroethylene (PTFE). However, this system increases the amount of wear in abrasive wear and has no effect as a lubricant.

[0006] Accordingly, a sliding property wear-resistant PPS composition having high mechanical strength and excellent roughness resistance has not yet been obtained.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned circumstances, and the following required performance required as a material for a sliding part: 1) The resin itself and the mating material are not worn by abrasive wear. Abrasion resistance 2) It is an object to provide an abrasion resistant resin composition satisfying high mechanical strength.

[0008]

That is, the present invention relates to an abrasion-resistant resin composition comprising a PPS resin and a specific glass fiber and a specific glass flake in a specific amount.

More specifically, based on 100 parts by weight of polyphenylene sulfide resin, 10 to 100 parts by weight of glass fiber having an average fiber diameter of 9 μm or more, 50% by weight or more of those having a flake diameter of 0.5 mm or more, and an aspect ratio of 10% or more. ~ 50
0 to 1 part by weight of glass flakes, provided that the average fiber diameter is 9 μm.
10 to 100 parts by weight of the above glass fiber, flake diameter of 0.
50% by weight or more containing 5mm or more
1 to 70 layers of glass flakes having an aspect ratio of 10 to 500
Parts and polyethylene wax, ethylene-pro
Pyrene copolymer wax, a compound represented by the following formula (1)
And a compound represented by the following formula (2):
Comprising 0.1 to 3 parts by weight of at least one release agent
Excluding fat composition.

Embedded image [In the formula (1), X is -CO-R (R is a C6-24
It represents an alkyl group or an alkenyl group. )]

Embedded image [In the formula (2), X is the same as above. n is 1-3. ])
It is about.

What is the PPS used here?

[0011]

Embedded image

Is a resin having a basic skeleton. This PPS
Is not particularly limited, the melt viscosity is 500 ~
A 20,000 poise (measured by a flow-type flow tester at 300 ° C. under a load of 10 kgf) is preferable from the viewpoint of balance of strength fluidity.

Further, those having a number average molecular weight of 2,000 or more and a weight average molecular weight of about 10,000 to 60,000 are desirable from the viewpoint of a balance between fluidity and strength.

Within this range, the PPS may be either a linear type or a cross-linked type, and a copolymer with other components such as a graft type, a block type, a random type or the like which does not impair the physical properties thereof. Alloys with elastomers, polymers and the like can also be used.

[0015] The glass fiber diameter must be at least 9 µm. In particular, 13 μm or more and 24 μm or less are preferably used. In the range, when high bending strength and elastic modulus are required, a material having a relatively small diameter is desirable. On the other hand, when wear resistance, impact resistance, and compressive strength are particularly important, those having a large diameter are desirable. Therefore, the fiber diameter may be selected in consideration of these balances. Aspect ratio is 100-300
About 0 has good balance between workability and physical properties.
In addition, surface treatment agents such as urethane-based and epoxy-based binders and silane-based coupling agents can be used for these glass fibers.

The filling amount of glass fiber is suitably from 10 to 100 parts by weight based on 100 parts by weight of PPS. Especially 20
-50 parts by weight is desirable. If the amount is less than 10 parts by weight, the strength is insufficient and the shrinkage ratio is increased. If the amount is more than 100 parts by weight, the wear resistance is reduced. When the wear resistance is important in this range, the amount of the glass fiber can be reduced, and when the strength is required, the amount can be increased. Further, the physical properties can be finely controlled by adjusting the mixing ratio with the glass flakes.

The glass flake referred to in the present invention is a glass flake having a flake diameter of 0.5 mm or more in an amount of 50% by weight or more and an aspect ratio of 10 to 500. Glass flakes having many particles smaller than this have a poor abrasion resistance effect imparted to the composition.

The aspect ratio (flake diameter / thickness) must be 10 to 500. If it is less than 10, it is not possible to orient in parallel with the surface of the molded article, and the wear resistance is reduced. If it is larger than 500, the moldability will decrease.

Further, if the glass flakes are in the above range, in order to improve the handleability, one flake is used.
It is also possible to use so-called granular glass flakes in which the sheets are bonded in layers using a suitable binder.

The filling amount of this glass flake is PPS1
It must be 1-70 parts by weight per 00 parts by weight. Particularly, 5 to 60 parts by weight is desirable. If the amount is less than 1 part by weight, no effect is exerted on the abrasion resistance, and if it exceeds 70 parts by weight, the strength is significantly reduced. At this content, specific glass flakes are oriented parallel to the surface of the molded product, so that the effect of adding to abrasive wear (wear resistance) is remarkably exhibited.

These specific glass flakes may be treated with a silane coupling agent or a non-silane coupling agent in order to improve the interfacial adhesive strength with the resin.

The composition of the glass flakes is not particularly limited, but E glass is easily available and has a good balance with physical properties.

The composition of the present invention may be added with an optional filler as long as physical properties are not impaired in order to impart rigidity, moldability and the like. For example, carbon fiber, silica fiber, aramid fiber, wholly aromatic polyester fiber, potassium titanate whisker, aluminum borate whisker, etc.
General-purpose inorganic fillers such as clay, silica, alumina, talc, kaolin, zeolite, gypsum, calcium carbonate, calcium sulfate, glass beads, silicon beads, granular phenol or its carbides, other carbon powders, wollastonite, stearin It is also possible to use zinc acid, carnauba wax and the like. They may be surface-treated materials. In addition, resins, rubbers and elastomers can be arbitrarily added. For example, polyethylene,
Ultra high molecular weight polyethylene, polypropylene, or polyamide, polyacetal, polyphenylene oxide,
Liquid crystal polymer, polyether sulfone, polyimide,
Polyether imide, polyether ether ketone, polyphenylene sulfide ketone, polyphenylene sulfide sulfone, phenolic resin, epoxy resin and the like, a mixture of a plurality of them, a copolymer, and the like are included.

On the other hand, in a fluororesin-filled system, lubrication with oil, grease or the like rather deteriorates the sliding characteristics, whereas in this composition, the lubrication system was also very effective.

Any method can be used for adding the additives. For example, there is a method of adding to the individual resin before or during the formation of the composition, or a method of adding after the formation of the composition or when melting the composition.

[0026]

The present invention will be described in detail with reference to the following examples, but the present invention is not limited by these examples.

Example 1 Glass fiber 5 having 100 parts by weight of PPS and an average fiber diameter of 13 μm
0 parts by weight, containing about 65% by weight of a flake diameter of 0.5 mm or more, and having an aspect ratio of about 150
Parts by weight were mixed using a tumbler mixer and pelletized using a twin screw extruder. AST using the sample
A bending test was performed in accordance with M, and strength and elastic modulus were measured.

Further, a molded body having a diameter of 102 mm and a thickness of 2 mm was molded by an injection molding machine. A
The amount of wear was measured according to STM D-1044. The conditions of the abrasion test are as follows.

Abrasion wheel: H-22 Test load: 1 kgf Test speed: 60 revolutions / min Comparative Example 1 P except that the average fiber diameter of the glass fiber was changed to 6 μm.
PS resin, glass fiber and glass flake were blended, molded and evaluated in the same manner as in Example 1.

Comparative Example 2 The glass flakes of Example 1 were blended, molded and evaluated in the same manner as in Example 1 except that the glass flakes were not replaced with those having an aspect ratio of 5 except that the flake diameter exceeded 0.09 mm. .

Comparative Example 3 100 parts by weight of PPS resin and 67 parts by weight of glass fiber were blended and molded in the same manner as in Example 1 and evaluated.

Example 2 The procedure of Example 1 was repeated, except that the glass flake content was changed to 50 parts by weight, compounded, molded and evaluated.

Example 3 The same procedure as in Example 1 was repeated except that the glass flakes of Example 1 were combined into a layer and replaced with a glass flake having an average particle size of about 1 mm, and evaluated.

Comparative Example 4 The procedure of Example 1 was repeated, except that the glass flake content was changed to 100 parts by weight, compounded, molded and evaluated.

Comparative Example 5 The procedure of Example 1 was repeated except that 20 parts by weight of the glass flakes were replaced with 10 parts by weight of PTFE, and the mixture was molded, molded and evaluated.

[0036]

[Table 1]

[0037]

The resin composition obtained according to the present invention has excellent strength and elasticity inherent in PPS without adding expensive lubricants and the like, and has excellent wear resistance obtained only with this composition. Can be provided at the same time.

Therefore, the abrasion resistance in a dust atmosphere is improved as compared with the conventional PPS composition. Therefore, it can be applied to a wide range of applications such as bearings, gears and outdoor sliding members related to automobiles.

Continuation of the front page (56) References JP-A-63-225554 (JP, A) JP-A-6-16935 (JP, A) JP-A-64-36650 (JP, A) JP-A-3-66756 (JP) , A) edited by the Society of Polymer Science, "New Polymer One Point (Vol. 1) Engineering Plastics", First Edition, Kyoritsu Shuppan, June 1987, p. 60 (58) Field surveyed (Int. Cl. ⁷ , DB name) C08L 81/02 C08K 7/14

Claims (1)

(57) [Claims] 1. A glass fiber having an average fiber diameter of 9 μm or more based on 100 parts by weight of a polyphenylene sulfide resin.
An abrasion-resistant resin composition comprising 1 to 70 parts by weight of glass flake having an amount of 00 parts by weight, a flake diameter of 0.5 mm or more, 50% by weight or more, and an aspect ratio of 10 to 500. (However, the average fiber diameter is 9μ or more
10-100 parts by weight of glass fiber, flake diameter 0.5m
m or more is contained by 50% by weight or more, and the aspect ratio
1-70 weight glass flakes with a ratio of 10-500
Part, polyethylene wax, ethylene-propyl
Len copolymer wax, a compound represented by the following formula (1):
And a compound represented by the following formula (2):
Resin comprising 0.1 to 3 parts by weight of at least one release agent
Excludes composition. Embedded image [In the formula (1), X is -CO-R (R is a C6-24
It represents an alkyl group or an alkenyl group. )] Embedded image [In the formula (2), X is the same as above. n is 1-3. ])