JPS59100140A - Preparation of sliding material composition - Google Patents

Abstract

PURPOSE:To obtain a uniform sliding material composition, by opening aromatic polyamide short fibers in the presence of a large quantity of water by means of a fiber opener, uniformly dispersing polyinide resin powder into spaces among the fibers at the same time, and then separating the water. CONSTITUTION:An opener is fed with an aromatic polyamide fiber of an average fiber length of 1-15mm., a powder-form polyimide resin and, if necessary, other fillers (e.g., graphite or silica) and a large quantity (about 10-80 times the weight of the materials) of water. The aromatic polyamide short fibers are opened by the opener while the polyimide resin powder is uniformly dispersed into spaces among the short fibers. The produced uniform slurry of materials is filtered to separate water, and the sheet of a sliding material composition remaining on the filter cloth is pressed and dried. The product sheet is used as such or cut to a suitable size for use in molding.

Description

DETAILED DESCRIPTION OF THE INVENTION In recent cutting-edge industrial fields, existing materials are no longer sufficient, and new, high-performance functions and materials are being sought. Bolymid, which has excellent heat resistance, has recently been used as a material that meets the high demands of industry, including electronic parts, copying machines, microwave ovens, automobiles, and industrial equipment.

It is attracting attention and being adopted in fields such as aircraft and nuclear equipment. Polyimide takes advantage of its heat resistance.

Polyimide compositions are now being used in applications that were traditionally considered to be the domain of metals and ceramics, as they are often used for applications under harsh operating conditions such as high temperatures and high-speed sliding. . Polyimide, which is conveniently used for these purposes, is generally used in combination with various fillers and reinforcing materials as a functional composite material that meets the requirement of 1 g = performance. Various filling materials are normal.

Since powder is used, it is easy to mix and combine with the resin. When using fiber as reinforcement material, black.

The material is impregnated with resin in advance, and the impregnated material is laminated and molded.

The land is formed by a filament winding method. Further injection, compression, and shrinkage.

Fiber composites using forming methods such as transf and ar.

The raw material used is a mixture of resin-impregnated chopped fibers and powdered fibers. - Glass fibers, carbon fibers, asbestos, etc. are usually used for these reinforcing materials, and recently aromatic polyamide fibers have come to be used for sliding applications.

Aromatic polyamide fibers include glass fiber and carbon fiber.

When combined with asbestos, various types of fats, etc., it not only has a reinforcing effect but also improves lubrication, making it a fiber suitable for use as a sliding material. However, when polyimide powder and short polyamide fibers are mixed in a conventional mixing stage, such as a two-rotation mixer or a super mixer, only the fibers become thread-like and are continuously connected. Very sweet, contains polyimide powder and other fillers.
It gets inside the thread-like shape of the lint and cannot be mixed properly.

Therefore, we investigated the uniform dispersion of polyimide powder and aromatic polyamide short length <a, and arrived at the method of the present invention as an effective means.

In other words, the present invention aims to provide a molding raw material with good quality by uniformly dispersing fibers and fillers into a resin, and is suitable for complex-shaped objects that cannot be molded by prepreg lamination methods. This enables molding by injection, pressing, and transfer methods.

The object of the present invention is to make fibers made of polyamide fibers with an average fiber length of 1 to 15 mm, polyimide resins, and other fibers with a diameter of 4 mm.
In the method of preparing these, with or without the use of a large amount of water, the fibers are loosened by scraping in the presence of a large amount of water, and the polyimide resin powder or other filler is applied uniformly to all the fiber spaces. ``l, 3゛ze (-7th.

Then mixed original moon impregnation water and separation (~, achieved by removing the water.

That is, powdered polyimide and aromatic polyamide staple fibers are mixed into a large amount of water (10 to 8
0 times, a skewer of water is suitable; Operation depends on the type of raw materials, blending ratio,
Although it varies depending on the device, approximately 5 to 50 minutes is appropriate.

When mixing, Granoa fl, poly-lard difluoroethylene (hereinafter referred to as PTFF), wrinkle strength,
Other fillers such as titanium oxide and knee sulfide may be added after the waste cotton and mixed with polyimide and fibers. The waste cotton waste used in the present invention is a device that has the function of loosening the fibers suspended in a large amount of water using a rotary blade (including a rotary blade), and a "disintegrator u, n". Equipment called pulpers, parefiners, etc., which removes natural pulp or asbestos, can be used in the method of the present invention. JI April (1 is unsuitable. The reason is that it was soaked in a large amount of water, and the fibers were broken while operating the waste cotton +@), and the fibers # and fl become weaker and the reinforcing effect decreases. Koto, polyimide, graphite, i] TFK,
This is because powders such as silica and Tj-0° may be separated from the glass fibers 1Ffn and carbon fibers after the waste is stopped, and it is difficult to achieve a uniform mixed state.

On the other hand, with 9 aromatic polyamide fibers, there is almost no folding or cutting of the fibers during operation, and polyimide powder or other filler powder is added to the gaps between the fibers dispersed in water.
It's as if it's adsorption 1- (including this).

Even after the stoppage 1- after waste cotton, separation of the fibers and powder raw material does not occur, and a uniform mixed state is maintained. Next, the process after waste cotton will be specifically described. When roasted aromatic polyamide fibers, polyimide powder, and other fillers are scraped together in the presence of a large amount of water, a homogeneous mixed slurry of the raw materials is obtained, and this slurry is filtered to form a raw material: and water separated. Obtain a sheet of mixed raw materials on p cloth. When the sheet is compressed using a sheath press or a roll and water is sufficiently removed, the subsequent drying time is shortened and the bulk specific gravity of the sheet is increased. The bulk specific gravity of the sheet (1) The higher the value, the more sloppy it becomes.In other words, during molding, the bulk of the raw material 1'l becomes smaller, which has the advantage of allowing smooth supply of raw materials.Filtration, 1-1: The raw material after shrinkage.
The mold is dried to completely remove moisture and used as a molding material. Depending on the molding method, this sheet can be formed into a single sheet, or it can be cut into appropriate sizes.

For example, it is easy to handle as a raw material for molding into fine flakes, injection, compression, and transfer.

The average length of the polyamide fibers used in the present invention is 1 to
Reason 01: ``If the average length of j' is less than i mm, there will be no reinforcing effect.''

On the other hand, if the fiber length is longer than 15 holes, the fibers become entangled with each other, making it difficult to unravel the fibers and causing them to stick to the rotary blade, making it impossible to disperse them uniformly.

The aromatic polyamide fiber used in the present invention refers to a polymer fiber synthesized by the condensation of aromatic cyamine and aromatic dicarboxylic acid (6.'', its derivative). ! Do 1 and polyparatu upper 2 l/nterental amide 2 decoy shoulder ti': 1
．． 1i1[1詑 (V1 cow and ÷ Yugokuriichi Sung C) point Dedery"1.L (".)T/wa heat resistance i'1 poly(
M) Haku1 itF+ and (・71 aliphatic or aromatic group namine・doll'i rib) also [-1< is aromatic polysalt shield part? (Also (・''-that visit,・door!・body) and form an imide bond 1.., ′)'8-I in a polymer with 1-mid rare occupation of υC-r-if 4- ) 04 \, Invention 1, ) \ actual details j91 are shown below.

i'y no JIX poly,, + mido toji,, Lu'
に'cNitT上14Kpv-Jε) Ding 29 Mil Zo (Prison-Ul W & (C-!i: 2 nn)?
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, -C to polyimide in Example 1? , 120 wards.

-(In Example 2, -1 polyimide 9[]) and graphite 30.ζ, Example 2 polyimide 90 and ■.

P T F E powder 7IO each -E ge K
F = V 1a r 7% lubricant water dispersion slurry: h, , (■) and beater kz, jiaB Run for 3 minutes. Pulp, polyimide, succiphite.

On F・'1' (B), 91 pieces of slurry are collected.
, i fiber Ku: adsorbed in the 4i1 gap)'15J and ρ[1
Even if the Vita is stopped, the fibers and powder raw materials are separated, and the four rivers are maintained in the tree. i missing(・(not puu this slurry)” -
1. (('l J: j) Reduced pressure, filtered water and all raw material molecules al[#L f(-.

('1 City I[, - above, (the remaining thickness C--1.
Hill +F'iA sand - 1〕L -σ I received more than 1 person's Shihori moisture, this sea 1. Total 8 [) 'c,
Dry for 11.1 minutes to completely remove moisture L/Yo
'Ji dry'-l□ D-1゜5 Approximately 5 to make it easier to hold the father shape
x5mc's small Y1 was attacked by 1/τ, and was blocked by If.

For molding, a compression molding machine is used, and the pressure is 5 Q Q kg/c.
m', 250"0.15 min 1'LX] υ in the mold
The cured product was heated for 2 hours and taken out A-6 This cured product was further subjected to a Bostkine treatment at 200°C for 21-1 hours, and then the proboscis was examined. The cross-sections of the molded products from Examples 1 to 2 were examined using a scanning electron microscope at a magnification of 2θ x 1. Tori, nku, su(...koK...]・-
One series (S, Kushinoite.

CrJ, bending strength 1 modulus of elasticity of the molded product of each example.

1 to 1.1 Measuring data of machinability are shown. 1 shows the measurement data of machinability. Sliding property 2 Machinability (・It is obvious that it is fragile.

Example polyimy 1: lJt? Water
ri meri ::] l-self (and 4.4' -・7
Amino/Fenino 1 methane and anhydrous methane and anhydrous methane were used for synthesis of 17" and polyimide 29. Q
5a Gojino J, left tr, *norij ml 1 ・
〜Rotozen<rtil U “Te, chili.

Koboku 1 Prefecture t"y, v, J, Polyimide 80 Weight', %, 6 mm Depending on the shape, the pressure is 300 to 6/Lm',
530 c, 40 minutes power 1j fortune telling! I, l, de l
2nd sunrise at 260'c] Tsukizo strike W-
Nearby was killed. The dispersion state of the fibers in the molded product was examined using a scanning electron microscope, and the result, magnified 200 times, is shown in Figure 4.
In addition, (=j table shows the dest results of [lI mouth strength 1 elastic modulus, friction 1 ¥ column 2 machining. From photo 4, K s v l a r0 short tri + '1 fl i
It was observed that 41 pieces of 1j were combined and uniformly dispersed in q+ and polyimide l-, and the physical property direction I- due to the dispersion of the fibers was 11. ritM,) can be done.

Filling materials were used in Germany.し/こ- is one piece, )-(this %i 1~・ro and molded with the same number iJ 29 note/'(T,.
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1-) Comparative example? -・4 Polyimide powder and K・・1・・■short fiber 6′, lI−σ)
', u, combination t・ρ, (,...2, V flender in ratio/bite example 2, comparative example ro (,, J: Ribbon blender, -4-] in comparative example 4) A mixing test was carried out using a mixer for each of the dry base ('X') ingredients by changing the blending ratio and mixing conditions. Comparative Example 2,
In 3, the fibers can be mixed in a thread-like manner, creating a homogeneous molding force: I...! +I can't do it. Furthermore, the mixture is extremely bulky and difficult to mold.
! ...? '). , the comparison mouth 4-17 is inserted into the inner part of the body jJI'1
1.1 of the 9 rotor blades
．． 1 part is mixed partially) (tesugi-unii).

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Special Wi-Applicant [Tokyo Meshuba: Company No. 2]
Figure 40

Claims (1)

[Claims] (11) A method for preparing aromatic polyamide fibers having an average fiber length of 1 to 15 m, a polyimide resin, and other fillers. A sliding method characterized by loosening the fibers using a cotton opening machine in the presence of a fiber, uniformly incorporating polyimide resin powder and other fillers into the interstices of the fibers, and then separating the mixed raw material from water and removing the water. Method for preparing material composition 3゜