JPS6020962A - Production of resin molding having excellent resistance to friction and wear - Google Patents

Abstract

PURPOSE:To produce a resin molding having excellent resistance to friction and wear and suitable for use as a material for sliding parts, by mixing a specified poly-epsilon-caprolactam powder with a synthetic resin and molding the resulting resin compsn. CONSTITUTION:A poly-epsilon-caprolactam contg. microcrystalline wax (having a m.p. of 75-100 deg.C and an MW of 500-1,000) uniformly dispersed therein, obtd. by polymerizing epsilon-caprolactam in the presence of said wax, is used. 10-100pts.wt. said wax-contg. poly-epsilon-caprolactam powder (or particle or flake) is mixed with 100pts.wt. synthetic resin such as polyamide, polyacetal or polyether sulfone. The resulting resin is injection-molded or extruded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for producing a resin molded article with excellent friction and wear resistance, and more specifically, a method of manufacturing a resin molded article with excellent friction and wear resistance. This invention relates to a method for producing an excellent resin molded article.

In general, resins such as aliphatic polyamide, polyacetal, polyethylene terephthalate, polybutylene terephthalate, polyphenylene oxide', and polyphenylene sulfide are more self-lubricating than metals, have a low coefficient of friction, good friction and wear resistance, are lightweight, and are easy to slide. Because it produces less noise, it is extremely useful as non-lubricated sliding parts such as bearings, gears, rollers, cams, and guide rails.

However, sliding parts using these resins alone have a relatively low usable pv value, that is, a friction limit load characteristic, and are currently limited to low-load applications.

Note that the use limit pv value as used herein generally means a load limit value at which the bearing material melts or seizes when the bearing material exceeds a certain surface pressure (P) and circumferential speed (V,). Therefore, the larger the limit pv value is, the better the friction and wear resistance is, meaning that it can withstand high loads.

Conventionally, in order to improve the friction and wear characteristics of such resins,
Methods have been carried out to improve friction and wear characteristics by adding lubricants such as molybdenum distributide, graphite, oil, and wax to these resins, but the resulting resin moldings have a limit pv value that is higher than that of the resin alone. 5 times or less and the coefficient of dynamic friction is 30
It was 0.05 or more even under high surface pressures of kg/cn1 or more, and was not able to withstand sufficiently for use as sliding parts.

The present invention improves these points and has a small dynamic friction coefficient.
The present invention provides a method for manufacturing a resin molded body that has a large limit +lV value and can be used as a sliding part.
The feature is that poly-ε-caprolactam powder, granules, or flakes in which 1 to 10% by weight of microcrystalline wax is uniformly dispersed is mixed with a synthetic resin base, and this mixture is molded using various molding methods. The present invention provides a method for producing a resin molded article with excellent friction and wear resistance.

The microcrystalline wax dispersed in poly-ε-caprolactam used in the present invention has a melting point of 75
It is a hydrocarbon mixture having a molecular weight of 500 to 1000 and containing isoparaffins having 40 to 5 carbon atoms as a main component and small amounts of naphthenes, aromatics, and normal paraffins at a temperature of 100°C to 100°C. Examples of commercially available products include the following. S/
V 2'305 (m, P,: 75.5°C) (Mo
bil Cbemical company! W), ML-44
5 (m, p,: 76.1'c) (Witco Che
mical), Ceratac-104 (m.

p, : 76, L'C) (manufactured by Petrolite), Nismax 180 (m, p, : 82.2
~87.8℃) (manufactured by Esso Standard), 111
-M1c1080 (m, p, : 83.9°c)
(manufactured by Kuchimoto Seirosha), Starwax -100 (m,
p,: 85.0°C) (PetroliLe! i!
Hard wax 1561 (m, P, :96.
0°C) (manufactured by Roger Reed), l1i-Mic20
9'5 (river, p,: 96.1℃) (manufactured by Nippon Seirosha)
etc.

The amount of poly-ε-caprolactam added to this microcrystalline wax is 1 to 10% by weight, and 10% by weight.
If it exceeds 1% by weight, the limit Pv value will not improve because physical properties such as mechanical strength will drop significantly, and on the other hand, if it is less than 1% by weight, the effect as a lubricant will decrease.

Such microcrystalline wax-containing poly-ε-caprolactam improves the friction and wear resistance of the base material (41) because part of the microcrystalline wax-containing poly-ε-caprolactam powder, grains, or flakes during friction wear. This is thought to be because the lubricant effect of microcrystalline wax and the heat resistance and mechanical strength effects of poly-ε-caprolactam work synergistically when exposed on the surface of the base resin.

The microcrystalline wax-containing poly-ε-caprolactam used in the present invention is -ε-ε-
Alkali metals, alkaline earth metals, and hydrides, hydroxides, oxides, alkyl compounds, and aryl compounds of alkali or alkaline earth metals at temperatures below the caprolactam point (100 to 210°C, preferably 130 to 180°C) Microcrystalline wax is polymerized by uniformly dispersing microcrystalline wax during anionic polymerization of ε-caprolactam in the presence of an anionic polymerization catalyst consisting of, etc., and an anionic polymerization promoter such as acyl compounds, isocyanates, triazines, carbodiimides, etc. It is made into powder, granules, or flakes to make it easier to mix with the base synthetic resin.

The base synthetic resin used in the present invention is a resin made of powder or granular flakes of polyamide, polyacetal, polyethylene terephthalate, polyphenylene oxide, polyphenylene sulfide, polysulfmen, polyether sulfone, etc., and includes talc, silica,
Inorganic and organic fillers such as calcium carbonate and carbon blank, reinforcing agents such as glass fiber and carbon fiber, pigments, external combustion agents, antistatic agents, stabilizers, and other reinforcing agents and extenders that are commonly mixed into resins. , additives may be used in combination.

Then, the microcrystalline wax-containing material is
ε-caprolactam is preferably used in an amount of 10 to 100 parts by weight based on 100 parts by weight of the base synthetic resin. If it is less than 10 parts by weight, the lubricant effect will be poor, while if it is more than 100 parts by weight, it will deteriorate the mechanical properties of the resin molded product. Deterioration of properties occurs.

Among various moldings, particularly for injection molding and extrusion molding, the amount of microcrystalline wax added preferably ranges from 1.0 to 5.0% by weight, and if it exceeds 5% by weight, the injection molding machine Alternatively, it tends to slip on the screw surface of the extrusion molding machine or the inner surface of the cylinder, resulting in poor biting, making it difficult to consistently supply the resin. Therefore, it is recommended to adjust the amount to 1.0 to 10% by weight. desirable.

The molding resin mixed in this way can be used for compression molding, injection molding,
Plates, rods, pipes, odd-shaped products, bearings, etc. are manufactured using extrusion molding methods.
It can be manufactured into gears, cams, rolls, guide rails, etc.

The plates, rods, pipes, irregularly shaped products, bearings, gears, rolls, guide rails, etc. molded from the molding resin containing microcrystalline wax-containing poly-ε-caprolactam of the present invention as described above weighs 30 kg compared to the resin alone. /CI
The coefficient of dynamic friction is small at high surface pressures of A or higher, and the usage limit is PV.
The value is improved by more than 5 times, and it has extremely excellent friction and wear resistance properties, and is particularly suitable for sliding parts.

Hereinafter, the present invention will be explained in detail with reference to examples, but it goes without saying that the present invention is not limited to these examples.

Examples 1 to 6 and Comparative Examples 1 to 6 Aliphatic polyamide resin (P^) pellets [Ube Industries at
Made by J 0111! 61030B], polyacetal resin (POM) pellets [BASI? Ultraform +12320], glass fiber reinforced polyethylene terephthalate resin (PUT) pellets [Toyobo Ql) Pyrobet [! MC'-330], glass fiber reinforced polybutylene terephthalate + 1 resin (PII
T ) Hereso) [[1l] Barosox 420 manufactured by L company
-SnO, Tsubador 5010GN manufactured by Mitsubishi Chemical Q-suke
B-20], glass fiber reinforced polyphenylene oxide resin (PPO) pellets [Noryl IIM manufactured by cPL
3020] to 100 parts by adding 50 M parts of crushed 3-4 square flakes of poly-ε caprolactam block in which 10% by weight of microcrystalline wax [Nismax 180 manufactured by Esso Standard Co., Ltd.] was dispersed. The mixture was mixed for 15 minutes at 80 rpm using a cylinder mixer. Next, a predetermined amount (200 g) of this mixture was weighed out, put into a temporary mold (inner surface 125 m x 210 m), and molded using a 37 ton press at the molding temperature shown in Table 1 from 1.8 to
Apply a surface pressure of 3.6 kg/ant and heat for 20 minutes, then apply a surface pressure of 25 to 36 kg/cj1 and cool with water for 30 minutes to form a seagull plate with a thickness of approximately 5 ms, approximately 120 fins in length, and approximately 205 fins in width. , a test piece for friction and wear was created. Further, as a comparative example, a test piece without the microcrystalline wax-dispersed poly-ε-caprolactam was prepared in the same manner and subjected to a friction and wear test as described below.

The coefficient of dynamic friction is the friction force at each pv value applied to the torque lever. Examples 1 to 6) are resin alone (Comparative Examples 1 to 6)
The limit fJV value is 5 to 10 times higher than that of G), and the dynamic friction coefficient is small even under high surface pressure of 30 kg/cJ or more, indicating excellent friction and wear resistance.

As described above, the production method of the present invention includes powder of poly-ε-kabu 1 colactam in which microcrystalline wax is dispersed,
By incorporating granules or flakes into the base resin, a molded product with extremely excellent limit Pv value and dynamic friction coefficient under high blood pressure can be obtained, and it is very suitable for surface 1 frictional abrasion properties, such as as a rib material. It can provide useful materials.

Patent applicant Niso Hoshi Held Co., Ltd. Procedural amendment (voluntary) July B□, 1980 Commissioner of the Japan Patent Office Patent application No. 128593 1982 2 Name of the invention Resin molded product with excellent friction and wear resistance Manufacturing method 3, relationship with the case of the person making the amendment Patent applicant address 4-1-21 Hamazoe-dori, Nagata-ku, Kobe Name (6
06) Mitsuboshi Belting Co., Ltd. 6, Target of amendment 7, Contents of amendment (11 Corrected "~ε-caprolactam" in the third line of page 5 of the specification as "poly-ε-caprolactam."

(2) On page 6 of the specification, line 8, "poly-ε-caprolactam is mixed with the base material" is corrected to "the amount of poly-ε-caprolactam mixed with the base material".

(3) “1.0 to 10% by weight” on page 6, line 20 of the specification
" is corrected to "1.0 to 5% by weight."

(4) "Usage limit pv value" on line 10 on page 7 of the specification is corrected to "limit Pv value."

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Claims (1)

[Claims] 1. Mixing poly-ε-caprolactam powder, granules or flakes in which 1 to 10% by weight of microcrystalline socks are uniformly dispersed into a base synthetic resin,
A method for producing a resin molded article having excellent friction and wear resistance, which comprises obtaining a resin molded article by compression molding, injection molding or extrusion molding the mixture.