JPS5887383A - Bulky processed string for friction material - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a bulk processed wire for friction materials that has extremely good homogeneity and can impart excellent durability to friction materials used in automobiles and industrial machines.

Conventionally, clutch facings, brake linings,
Asbestos fibers have been widely used as the base material for inorganic edge wires in friction materials such as disc bats, but recently, asbestos fiber pollution problems have arisen, and demand for friction materials that do not use asbestos fibers has increased. ing. Against this background, studies are being conducted to use other fibers such as glass fibers and other inorganic fibers as base materials for friction materials that can replace asbestos fibers, but this has not yet been put to practical use. is the current situation.

For example, glass fibers such as glass roving and glass thread, which have been widely used in the past, can be used as a base material for friction materials.
When used, resin impregnation and resin retention are inferior to asbestos fibers, so! ! ! Due to its poor characteristics as a neutral rubbing material for fixtures, it cannot be used generally, and a method to solve these problems was published in the Publication of Utility Model Publication 1972-
111?8. This method is core f! :PI
The resin impregnating property and resin retention property are improved by using a bulky processed edge made by covering the continuous fibers of II with an intertwined substance of short fibers.

The manufacturing workability is extremely good, and friction materials of excellent quality can be obtained. However, since this bulky processed string for materials covers the fibers that make up the core 1 with an intertwined material of viper fibers,
It has been found that it is difficult to uniformly disperse and entangle short glass fibers, organic fibers, carbon fibers, etc., and it is difficult to obtain strings of a constant thickness and composition. As a result of extensive research, we have developed a core that has excellent impregnating properties and resin retention ability, and has evenly distributed glass fibers, carbon fibers, organic fibers, or metal fibers to create strings of a constant thickness. One or more types of filamentized and entangled continuous fibers are formed around the fibers constituting the core by passing through a high-speed airflow while adjoining the fibers and at least one type of continuous fibers that are easily filamentated. 4. It has been found that the toothed string for friction materials coated with fibers has very good compositional unevenness and thickness stability of the base material.

The fibers used in the bulky edge for friction materials of the present invention are one or more fibers selected from glass fibers, Ariiso fibers, carbon fibers, and metal fibers.

Glass fibers are usually commercially available A glass, C glass,
S glass, E glass, C glass, etc. can be used, but E glass is preferable from the viewpoint of cost and heat resistance.

Organic fibers can be natural fibers or chemical fibers.

The fibers may be used alone or in combination. As the organic fiber, cotton, rayon fiber, acetate fiber, aromatic polyamide fiber, etc. can be used. As the carbon fibers, polyacturyl, kynor, pitch, and other carbon fibers can be used.

As the metal fiber, a metal wire made of brass, zinc, steel, aluminum, iron, etc. can be used.

The present invention will be specifically explained below using Examples and Comparative Examples.

EXAMPLE FIG. 1 shows an external view of a toothed string for friction materials according to an example of the present invention, and FIG. 2 shows a schematic cross-sectional view of the broom. or,
FIG. 6 is an external view of a bulky processed edge for friction material made by the method disclosed in Japanese Utility Model Publication No. 55-111978, and a cross-sectional view is shown in FIG. 4, and FIG. 4 is a schematic diagram for comparison.

(1) Composition and preparation method of bulky processing string 1) IK assembly example (Fig. 111, Fig. 2 and Fig. 5) Diameter α16III
One brass wire (800 glass fibers with a diameter of about 12 tones with strong adhesive strength!A core yarn consisting of two continuous glass fiber strands (3) with a thickness of 220 tex, which are bundled with a one-sided treatment agent, Gather 800 glass fibers with a thickness of 55 tex with a surface treatment l1M with a weak adhesion strength, and create one continuous glass fiber strand with a thickness of 9 220 tex (- and 220 tex at the same time as shown in Figure 5). The continuous fibers drawn out from the nozzle are exposed to the high velocity air fluid around the core yarn to filamentate and entangle the continuous fibers as shown in Figures 1 and 2. 9. Obtained as a coated bulky edge.

In the manufacturing method of the present invention, as necessary, in order to strengthen the bonding force between the core yarn and the continuous filament yarn, or to fully increase the bonding force with the resin used for the friction material, such as Claso Tifa 7-ing or Brake 2-ning, etc. In order to improve the properties of the molded article, a treatment liquid (9) may be applied, and after drying through a dryer (10), it may be wound up in a winder (13) to produce a bulky processed edge for friction materials. Table t41 shows the set values for the blending ratio of this bulky processed edge.

Table 1 Target Composition of Bulky Processed Edges According to Examples 2) Comparative Example (Figures 6 and 4) 1 brass wire with a diameter of 1116mm Two continuous glass fiber strands with a thickness of 220 tex (3
) was interlaced with mixed fibers for interlacing (4) consisting of carbon M fibers with an average length of 5 f) sw, glass fibers with an average length of 50 cm, and rayon stable with an average length of 50 mm. Bulky processed paper was prepared.

The set value of the blending ratio of this bulky processed paper is shown in the 24th table.

Table 2 Target Composition of Bulky Processed Paper According to Comparative Example 20 pieces of bulky processed m obtained in Examples and Comparative Examples were cut at 10+% intervals from the end, the thickness of the paper was measured, and the number of zmi was calculated from the measured value. The results are shown in Table 4.

We analyzed the first to eighth samples whose thickness measurements were completed, and calculated the coefficient of variation of the blending ratio of each material from the measured values, which is shown in Table 1.

Table 3: Tex of bulky processed paper Table 4: Mixing ratio of materials for bulky processed paper It can be seen that this is significantly better than when short fibers are intertwined.

The composition ratio of the material of the bulky processed paper was measured as follows. .

(4) Mixing ratio of metal fibers Weigh the weight (Wo) of the dried bulky processed paper, extract the metal fibers from it, weigh the weight It (WM), and mix the metal fibers according to the following formula: The rate was calculated.

(B) Glass fiber mixture ratio (A) s 9 bulky processed cords excluding metal fibers + 1 t Heating at approximately 625°C for 1 hour in a Matsufuru furnace to completely decompose organic fibers and carbon fibers, resulting in glass fibers The remaining m1 (
WG) was weighed and the mixing ratio of glass fibers was calculated using a linear equation.

(C) Bulky processed paper with carbon fiber blending ratio (4) excluding gold fiber, approximately 10ft! !
PtL was crushed for 5 minutes using a vibratory crusher, placed in an aluminum ring with a diameter of 50 mm and a height of 5 cm, and then pressurized with a pressure of 2 W. The lightness (L) value was measured using a color difference meter.
From the relationship diagram in the figure, the carbon Ia embroidery mixing ratio <c>t* was calculated.

(b) Organic fiber mixture ratio Calculate the mixture '4 of the bulge according to the following formula: Organic fiber mixture * (F ) - 1oo - (M + G + C) (4) (2)
Clutch facing molding method and characteristics The bulk above
A processed string sample was impregnated with melamine resin and then pre-dried, and the pre-dried Mecumin resin-impregnated bulky and strong rope t-f
It was preformed into a donut shape by winding it into four rolls (7).The preform was placed in a press molding machine at 8° C. and press molded to prepare a Kranote Fa/ing sample.

The burst strength lf<=rotational fracture strength f) at 200° C. of each of the clutch facing samples produced by the above method using different types of bulky strings was measured, and the results are shown in Table 1.

From Table 6 on the left, the Clutch Facing using the bulky processed string of the present invention has a higher burst strength and is extremely superior as a friction material compared to the Clutch 7 Acing using the bulky processed string with intertwined short fibers shown in the comparative example. It can be seen that it has certain characteristics. This is because the bulky processed edge of the present invention is composed of continuous filaments and has extremely good uniformity in thickness.
This is because the manufactured clutch facing has good homogeneity and good balance.

! Table 6 Clutch facing burst strength

[Brief explanation of the drawing]

Figure 1 is an external view of the bulky processed edge for friction materials of the present invention.
The figure shows a cross-sectional view as a schematic diagram. Figure 3 is an external view of a bulky cord for J4I material disclosed in Japanese Utility Model Application Publication No. 55-111978 as a comparative example, and Figure 4 is a schematic cross-sectional view. FIG. 5 shows a schematic diagram of a method for manufacturing a bulky edge for friction materials according to the present invention. FIG. 6 shows the relationship between the carbon fiber content and brightness in the bulky string. Description of symbols Horse 1 Figure 2 Figure 4 Single 6 figure

Claims (1)

[Scope of Claims] t. A bulky processed string for friction materials, in which item 4 of the fibers constituting the core is covered with at least one type of filamentized and intertwined continuous fibers. 2. The fibers that make up the core are glass fibers and organic fibers. The bulky processed wire for friction materials according to claim 1, which is at least one type of fiber selected from the group of carbon fibers and metal fibers. 5. Filamentized series #111! The bulky processed wire for friction materials according to claim 1, wherein the miscellaneous fibers are at least one type of fiber selected from the group consisting of glass fibers, organic fibers, carbon fibers, and metal fibers.