KR0150803B1 - Polyamide fiber of crushing machine - Google Patents

Abstract

The present invention is to provide an apparatus for producing short fibers of wholly aromatic polyamide having a simple structure, excellent fibril development, and excellent economic efficiency. To this end, the present invention, the polymer inlet is coupled to the upper and formed in the shape of a conical cone widening in the downward direction is fixed on the lower grinder and the inner surface of the grinding wheel is formed in a plurality of directions; The short fiber discharge port is formed, and the inner surface has a crushed bone formed in a plurality of directions and has an inverted cone shape that widens in the upper direction to support the upper grinder and to be driven and rotated by a motor installed at the lower portion. It provides a production apparatus for all aromatic polyamide short fibers, characterized in that consisting of a grinder.

Description

Apparatus for the production of wholly aromatic polyamide short fibers

1 is a configuration schematically showing a short fiber manufacturing apparatus used in the present invention,

Figure 2 shows the form of the inner surface of the preferred grinder of the short fiber manufacturing apparatus of the present invention,

Figure 3 shows the shape of the inner surface of the grinder which is undesirable in the present invention,

4 is a configuration diagram schematically showing a conventional roller-like short fiber manufacturing stationary.

* Explanation of symbols for main parts of the drawings

1: polymer inlet 2: upper grinder

3: crushed bone 4: lower grinder

5: single fiber discharge port 6: motor

The present invention relates to a wholly aromatic polyamide short fiber manufacturing apparatus. The wholly aromatic polyamide is very important as a material when high stiffness and heat resistance are required because of its high rigidity, high mechanical strength and high heat resistance.

In particular, pulp-like short fibers have received great attention as substitutes for asbestos, which are regulated in terms of environmental risk because of the risk of carcinogenesis, and have become a very important material in the industry where the demand is increasing considerably. Technological advances in manufacturing devices are becoming increasingly noticeable.

Fully aromatic polyamide short fibers are generally produced by a method of grinding a wholly aromatic polyamide polymer having a predetermined intrinsic viscosity in a pulp making apparatus.

As an apparatus for manufacturing such a wholly aromatic polyamide short fibers, conventionally, a roller-type grinding apparatus combining a disk-type grinding apparatus provided with a disk plate and a roller having a grinder blade installed inside the cylinder and a grinder blade attached to the outer surface thereof. Is disclosed.

However, the above-described disk type grinding device or roller type grinding device not only has low grinding efficiency such as the time taken to grind the polymer into the grinder and exceeds 10 minutes, but also has a poor particle size of the powder obtained by the cycle. In order to obtain uniform fibers of uniform size, at least 20 grinding operations must be repeated in one process. Accordingly, in order to manufacture short fibers in a continuous process, 20 or more grinders must be installed, and the installation area of the manufacturing apparatus becomes excessive, resulting in a large economic burden due to excessive facility investment of the factory.

The present invention has been made to solve the problems of the conventional all-aromatic polyamide short fiber manufacturing apparatus as described above, the production of a wholly aromatic polyamide short fiber with excellent short-fiber forming ability and excellent economical efficiency that can be more simply manufactured structurally The purpose is to provide a device.

In order to achieve the above object, the present invention, the polymer inlet (1) is coupled to the upper and is fixed on the lower grinder (4) forming a conical shape that is wide in the downward direction and the inner surface is divided in a number of directions An upper grinder 2 on which the clavicle 3 is formed; The short fiber discharge port 5 is formed, and the inner surface has a grind bone 3 formed in a plurality of directions, and has a circular thrust shape that is wider in the upper direction to support the upper grinder 2 and is installed at the bottom. It provides a device for producing a wholly aromatic polyamide short fibers, characterized in that consisting of; a lower grinder (4) is driven and rotated by a motor (6).

The manufacturing apparatus of the above-mentioned wholly aromatic polyamide short fiber which concerns on this invention is demonstrated in detail according to drawing.

1 is a configuration diagram schematically showing an example of an apparatus for producing wholly aromatic polyamide short fibers according to the present invention. As shown in FIG. 1, the wholly aromatic polyamide short fiber manufacturing apparatus according to the present invention is fixed on the lower grinder 4 by forming a truncated cone shape in which the polymer inlet 1 is coupled to the top and widened downward. The inner surface includes: an upper grinder 2 in which grinding bones 3 are formed in a plurality of directions; The short fiber discharge port 5 is formed, and the inner surface is formed in the reverse cone shape in which the crushed bone 3 is formed in a plurality of directions and widens in the upper direction to support the upper grinder 2 and is installed at the lower portion thereof. It is composed of; a lower grinder (4) is driven by the motor (6) which rotates. The upper grinder 2 can be combined with a hinge element such as a hinge to the body of the grinding apparatus to which the lower grinder 4 is fixed and separated from the lower grinder. The upper grinder may also be completely separated from the grinding apparatus in which the lower grinder is fixed. In this way, the upper grinder and the lower grinder separated from each other are provided with a screw hole in each body to form a mutual coupling with the bolt. This bolting through the threaded hole is very robust, allowing the gap between the upper grinder and the lower grinder to remain constant during operation. In addition, the bolt coupling can be easily released by manpower, there is an advantage that the disassembly and maintenance of the device is very simple.

As shown in FIG. 1, the upper grinder 2 is firmly fixed to the body of the grinding apparatus without rotating during operation. The polymer introduced into the grinder through the inlet 1 coupled to the upper part of the upper grinder is crushed by hitting the upper grinder 2 and the lower grinder 4 by the rotation of the lower grinder 4 driven by the motor 6. The result is a pulp short fiber.

Pulp-like short fibers formed by pulverization by the upper grinder and the lower grinder are discharged out of the grinder through the discharge hole formed in the lower grinder along the grind bone formed on the inner surface of the upper grinder and the lower grinder.

In the apparatus for producing a wholly aromatic polyamide short fiber according to the present invention having the above structure, the upper grinder 2 and the lower grinder 5 have the grinding bones 3 in a plurality of directions on the surface thereof. It extends to the end of the grinder. Figure 2 illustrates an example of the crushed bone formed on the inner surface of the upper, lower grinder of the short fiber manufacturing apparatus according to the present invention. As shown in Figure 2, the grinding bone is formed extending in various directions from the center of the grinder to the end. By extending the crushed bone in various directions from the center of the grinder to the end portion in this way, it is easy for the pulp-like short fibers formed by pulverizing in the grinder to escape from the crushed bone of the grinder to the discharge port. It is possible to have an effect that can be prevented from being crushed to an excessively short length within.

The crushed bone formed on the inner surfaces of the grinders 2 and 4 is formed with the inclined angle of 30 to 70 degrees as shown in FIG. When the inclination angle of the valley and the valley becomes smaller than 30 ° or larger than 70 °, problems such as powder or fiber thickness become excessively large are undesirable.

The short fiber manufacturing apparatus of the present invention having the above structure has an operational convenience in which the size of the fiber can be adjusted very easily by adjusting the distance between the upper grinder 2 and the lower grinder 4. In addition, by repeating the grinding operation only about two times, it is possible to produce a short fiber having physical properties superior to the fiber obtained by the 20-time repeated operation of the conventional disk type.

Next, the present invention will be described in more detail with reference to preferred embodiments of the present invention. However, these examples are merely provided to more easily understand the present invention, the present invention is not limited to these examples.

[Preparation of all aromatic polyamide polymer]

The reactor of the 2-liter vessel was thoroughly purged with nitrogen to completely remove water, and then 40 g of calcium chloride was added to NMP450ml to completely dissolve to prepare a primary polymerization solvent, followed by dissolving 24.5 g of 1.4-phenylene diamine. After lowering the solution above 10 ° C with water and ice, 45.95 g of terephthaloyl chloride was added thereto, and the liquid crystal polymer solution before gelation, which was obtained by vigorous stirring polymerization, was left at 70 ° C for 2 hours and then immersed in water to extract the polymerization solvent. To obtain a polymer. The wholly aromatic polyamide polymer obtained by the above method has physical properties in the range of intrinsic viscosity 4.0-5.5.

Example 1

Using the pulverizer having the structure of FIG. 1, a wholly aromatic polyamide polymer having an intrinsic viscosity of 4.0 prepared by the above method, the distance between the upper grinder and the lower grinder was 1600 µm, and the second the grinder spacing. Was made into 200 micrometers, and the grind | pulverization operation | movement was carried out three times with the grinder space | interval three times at 60 micrometers, and pulp-like short fiber was manufactured.

EXAMPLES 2-7

The intrinsic viscosity of the polymer used in Example 1, the grinder spacing of the grinder, and the number of grinding operations were substantially the same as in Example 1 except that the following operations were performed as shown in the following table.

Comparative Example 1

The polymer having an intrinsic viscosity of 4.8 obtained by the above method was subjected to 20 continuous grinding operations using a conventional disk type grinder to prepare pulp-like short fibers.

Comparative Example 2

The pulp-like short fibers were produced by pulverizing for 15 minutes while continuously circulating a polymer having an intrinsic viscosity 5.0 obtained by the above method using a conventional disk type mill.

Comparative Example 3

As a result of pulverizing operation using the grinder having the shape of FIG. 3 in which the pulverized bone was formed only in the center portion of the polymer having the intrinsic viscosity 4.7 prepared according to the above method, the amount of fine powder was very high, and The yield was less than 50% compared with Examples 1-7.

The physical properties of the pulp-like short fibers obtained in Examples 1 to 7 and Comparative Examples 1 to 3 were compared and evaluated by measuring the degree of freedom. The degree of freedom of pulp refers to the degree of water escape from the pulp-like fiber loosened in one liter of water, and is a measure of the degree of fiber formation. The better the fiber development, the less the amount of water released. In other words, the more well-developed pulp, the lower the degree of freedom.

[Assessment Methods]

1. Yeosu: Measured using CANADIAN FREENESS TESTER (Model: CODE SE 030) according to TAPPI method 227.

As shown in the results of the above table, the pulverizing apparatus formed of the structure according to the present invention, in the production of wholly aromatic polyamide short fibers, by adjusting the distance of the grinder 20 times or more in the conventional disk type pulverizer by only two grinding processes It can be seen that short fibers having better physical properties than those of pulp-like short fibers obtained by performing a continuous grinding process can be produced.

Claims (4)

An upper grinder having a polymer inlet coupled to the upper part and having a conical shape that is widened in a downward direction and fixed to the lower grinder, and the inner surface of which is ground bone in a plurality of directions; The short fiber discharge port is formed and the inner surface has a crushed bone formed in a number of directions and has an inverted cone shape that is wider in the upper direction to support the upper grinder and to be driven and rotated by a motor installed at the lower portion. Grinder; Apparatus for producing wholly aromatic polyamide short fibers, characterized in that consisting of. The all-aromatic polyamide stage according to claim 1, wherein the upper grinder and the lower grinder have a structure in which the inner surfaces thereof are formed in which crushed bone extends from the center of the grinder to the end portion in a plurality of directions. Apparatus for the production of fibers. The apparatus of claim 1, wherein the grinder can be separated from the support on which the lower grinder is mounted. 3. The apparatus for producing wholly aromatic polyamide short fibers according to claim 1 or 2, wherein the crushed bone has an angle of inclination between the bone and the bone of 30 to 70 degrees.