KR101542093B1 - Apparatus for Material of Aramid Paper and Compounded Aramid Pulp with Uniform Length with Floc Slurry - Google Patents

Abstract

The aramid apparatus of the present invention is characterized in that a conventional slurry disk and a cone type milling apparatus are provided with a flask slurry inlet located between the rotating saw disk and the cone type milling apparatus. The injected flux slurry is uniformly mixed with the aramid polymeric material while being subjected to the shearing force by the rotary sawtooth disc and the cone type milling machine to reduce the paper manufacturing process and to uniformly disperse the aramid pulp and increase the surface area of the pulp Thereby increasing the contact density between the fibers, thereby making it possible to produce a paper having excellent physical properties.

Description

Technical Field [0001] The present invention relates to an aramid pulp producing apparatus and a method for producing aramid pulp,

The present invention relates to an apparatus for producing aramid pulp. More particularly, the present invention relates to an apparatus for producing aramid pulp which produces aramid pulp of uniform length by mixing an aramid polymeric material and a flake slurry, a manufacturing method thereof, and an aramid pulp of uniform length obtained therefrom.

The aramid pulp is made from a polyamide based resin. The polyamide-based resin is classified into an aliphatic polyamide resin widely known as nylon and an aromatic polyamide resin developed for enhancing the heat resistance of the nylon. The aromatic polyamide-based resin is an aramid resin. The aramid resin is classified into para-aramid resin and meta-based aramid resin. Representative products of meta-based resin include "Nomex" and "Teijin" developed by DuPont, Conex ". Such meta-based aramid resins are generally used for heat-resistant clothes such as fire-extinguishers and high-temperature filters because they are generally excellent in heat resistance, elongation and strength. Especially, since they have excellent electric characteristics, they are used as a raw material for insulating paper used for generators, motors, It is also used in manufacturing.

Meta-aramid pulp is a material similar to artificial staple fibers developed for use in the manufacture of 100% synthetic fiber paper and high-strength nonwoven fabrics. Fibrillated pulp during the production of paper has a high surface area and high contact between the fibers Density can be obtained and a paper having excellent physical properties can be produced. However, the meta-aramid is not a liquid-crystalline material because the para-aramid exhibits crystallinity with the toughness of the polymer chain itself due to the regular arrangement of the aromatic rings and shows a fibril form under special conditions. it's difficult. Due to the characteristics of the meta-aramid, the meta-aramid pulp is produced from a doped state while slowly proceeding from solidification to shearing force. This makes it difficult to produce a uniform type of pulp and increases the process time, thereby lowering the yield.

In addition, the paper of the meta-based aramid is produced by mixing pulp and floc. In the paper process, there is a problem that a complex process of mixing the pulp and the flake in the raw material container and beating the raw paper is required.

In order to solve the problems of the prior art as described above, the inventor of the present invention invented a pulp making apparatus capable of controlling the solidification (progress) speed by separately injecting water and an aramid resin solution in Patent Application No. 10-2013-0121031 In addition, the apparatus for producing an aramid pulp of the present invention, in which the length of the pulp is uniform and the flask slurry is injected into the middle of the pulp making apparatus, the process time is shortened before the papermaking process, and the pulp yield is improved. And to develop pulp manufacturing methods.

It is an object of the present invention to provide an apparatus and a method for producing pulp which produce aramid pulp of uniform length.

Another object of the present invention is to provide a pulp manufacturing apparatus and a manufacturing method which shorten the processing time required for producing aramid pulp and improve the yield of pulp with uniform quality.

The above and other objects of the present invention can be achieved by the present invention described below.

The apparatus for producing an aramid pulp according to an embodiment of the present invention is characterized in that an aramid pulp manufacturing apparatus including a rotary sawtooth disc 4 and a cone type milling apparatus 5 is provided with a rotary saw blade 4, And a slurry injection port 8 disposed between the slurry injection port 8 and the slurry injection port 8. The slurry injection port 8 is filled with a flux slurry. As the flux slurry, aramid fibers may be uniformly dispersed in water.

The pulp manufacturing apparatus according to another embodiment of the present invention may further include a disc assembly 3 including a cylindrical column 31 and a disk 32 in addition to the slurry inlet 8, (32) may have a plurality of holes (33) formed at a predetermined distance and spacing from the cylindrical column (31).

The rotating saw blade can be rotated at a speed of 9,000 to 15,000 rpm for cutting to a uniform size while applying a uniform shear stress to the pulp.

The method for producing aramid pulp according to the present invention is a method for producing aramid pulp by applying a shearing force to a mixed composition of aramid dope and coagulating liquid, wherein the method further comprises the step of adding the flux slurry when the mixed composition is pulverized by the shear force Wherein the mixed composition and the flux slurry are uniformly mixed and dispersed by a shear force.

The ratio of the aramid dope to the coagulating liquid may be a ratio of the dope 1: coagulating liquid 10 to 30.

Aramidod dopes are prepared by dissolving a meta-aramid composition made of m-phenylene diamine (MPD) and isophthaloyl chloride (IPC) in an amide solvent, dimethyl acetamide (DMAc) Can be used.

As the coagulating solution, those containing amide-based solvent dimethylacetamide in an amount of 30 parts by weight or less relative to 100 parts by weight of water may be used.

The aramid pulp produced by the present invention may have a fiber length of 0.8 mm to 1.2 mm and a fiber width of 25 um to 35 um.

BRIEF DESCRIPTION OF THE DRAWINGS FIG.

The apparatus or the method for producing an aramid pulp according to the present invention is a method for producing an aramid pulp by injecting a floc slurry in which the aramid fiber is uniformly dispersed in water separately from a dope so that the applied floc slurry receives a shearing force with the aramid polymeric material, It is possible to provide a pulp having a uniform length by mixing and dispersing the pulp. In addition, the aramid pulp produced according to the present invention has uniform distribution of the fiber length and fiber width of the pulp, so that pulp of uniform quality can be obtained with a high yield, thereby shortening the processing time and reducing energy and cost. It has three effects.

FIG. 1 is a schematic view of an apparatus for producing an aramid pulp according to an embodiment of the present invention, in which a flux slurry is additionally introduced through a slurry inlet located between a rotary sawtooth disk and a cone type milling apparatus.
FIG. 2 is a schematic view of an apparatus for producing an aramid pulp according to another embodiment of the present invention. Specifically, FIG. 2 (a) shows an apparatus for producing an aramid pulp including a disk slurry inlet and a disk assembly composed of a cylinder and a disk in order to control the solidification speed of the neutralized product, 2 (b) shows a disk-shaped disk having a cylindrical column and a plurality of holes formed on the disk assembly.
FIG. 3 is a photograph of an aramid pulp produced according to the present invention.
The fourth shows the distribution of the aramid pulp produced according to the present invention, wherein the x-axis represents the fiber width and the y-axis represents the distribution of the fiber length. This confirms that the pulp has a uniform fiber length and fiber width.

The apparatus or method for producing an aramid pulp according to the present invention is characterized in that a floc slurry is introduced through a slurry inlet so that the floc slurry is uniformly dispersed in a rotating saw blade and a cone type milling apparatus together with an aramid polymeric material, The bond strength between them is increased to provide a pulp having a uniform length (fiber length and fiber width).

Aramid  Apparatus for manufacturing pulp

As shown in FIG. 1, the aramid apparatus according to an embodiment of the present invention is characterized in that, for a conventional apparatus for producing an aramid pulp including a rotating sawtooth disc and a cone type milling apparatus, And a flux slurry injection port into which the flux slurry is injected is additionally provided. The injected flux slurry is not particularly limited as long as the aramid fiber is dispersed in water. The injected flux slurry is pulverized together with the aramid polymer through a rotating sawtooth disc and a cone type milling apparatus and is dispersed uniformly at the same time.

The aramid device according to another embodiment of the present invention shown in FIG. 2 is disposed between the rotating sawtooth disc and the cone type milling device and includes a slurry inlet port into which the flux slurry is introduced, a disk assembly comprising a cylindrical column and a disc- Respectively. The disc-shaped disc has a plurality of holes formed at a predetermined distance and spacing from the cylindrical column.

2, a pulp making apparatus of FIG. 2 (a) includes a water inlet 1, a polymer solution inlet 2, a disk assembly 3, a rotary saw disk 4, The disc assembly 3 is inserted into the cylindrical pillar 31 and the disc 32 in the conventional aramid pulp manufacturing apparatus composed of the cone type milling apparatus 5, the discharge port 6 and the material filling space 7, And the disk 32 is formed with a plurality of holes 33 at a predetermined distance and spacing from the cylindrical column 31. [ At this time, water passes through the inside of the cylindrical column 31, and the aramid resin solution passes through the hole 33.

The raw material solution injected through the polymer solution injection port 2 is filled in the raw material filling space 7 and discharged through the plurality of holes 33 formed in the disk 32. At this time, To solidify the discharged solution through the hole (33).

The polymer solution inlet (2) is located at the side of the raw material injector where a mixture of an aramid polymer and a dimethyl acetamide (DMAc) solvent is injected. The introduction of the aramid solution is carried out at a constant rate so that a shearing force acts on the same amount of raw material, preferably at a rate of 6.5 Kg / hr to 7.5 Kg / hr. The injected solution can be temporarily stored in the raw material filling space 7 of the raw material feeder.

A rotating sawtooth disc 4 is provided at the bottom of the disc 32 and is discharged through the hole 33 while rotating around the shaft to cut the pulp solidified by the water into a predetermined length. 2 (b) is a schematic view of the rotary saw tooth disk 4, which is positioned at the lower portion of the disk assembly 3 and rotates at a constant speed, while pulp discharged through the plurality of holes 33 of the disk assembly 3, Cut to length. The rotary saw blade 4 is preferably rotated at a speed of 9,000 to 15,000 rpm in order to cut uniformly the aramid pulp discharged into the plurality of holes 33 while uniformly applying a shearing stress. The rotary saw disk 4 is also used in a conventional apparatus and can be easily practiced by those skilled in the art.

The water is formed so as to pass through the cylindrical column 31 in the vertical direction so that the introduced coagulating liquid can pass through the rotary saw disk 4 without being mixed with the coagulating liquid (water) in the raw material filling space 7. It is preferable that the coagulating liquid is injected at a constant rate per hour. It is particularly preferable that the mixing ratio of the aramid solution and the coagulating liquid is 1:10 to 30, preferably 1:15. The water injection port 1 is connected to the rotary saw disk 4 through the raw material filling space 7 so that the aramid solution and the coagulating solution are mixed in advance before crushing to be solidified in the dome space of the polymer solution inlet 2 It can be prevented that it is settled. The coagulating liquid which has passed through the water inlet 1 and passed through the rotary saw disk 4 is circulated through the cone type milling device 5 and is subjected to the shearing force.

The cone type milling device 5 is a device for applying a shearing force to the solidified material while interlocking with the rotary saw tooth disk 4, and the rotation speed is set to be the same as that of the rotary saw tooth disk.

It is preferable that the plurality of holes 33 have a diameter of 0.1 to 1.0 mm, more preferably, the plurality of holes are located on the same circumference and have the same diameter.

Aramid  Method of manufacturing pulp

(A) Production and insertion of dope

A meta-aramid composition prepared from m-phenylene diamine (MPD) and isophthaloyl chloride (IPC) is dissolved in amide-based solvent dimethyl acetamide (DMAc) ).

The prepared meta-aramid dope is put into a pulp apparatus of a first degree by using a mono pump for high viscosity, and the ratio of the dope and the coagulating liquid is adjusted by controlling the ratio of the dope 1: coagulating liquid to 10 to 30, 1:15 ratio is recommended to put constantly. It is preferable to use a coagulating solution containing 100 parts by weight of water and 30 parts by weight or less of dimethylacetamide, more preferably 10 to 30 parts by weight of dimethylacetamide good.

(B) loading of the flux slurry and primary grinding by the rotating tooth disc

The flux slurry is introduced through a flask slurry inlet located between the rotary sawtooth disc and the cone type milling apparatus of the apparatus for producing an aramid pulp of the present invention. The introduced slurry is an aramid fiber dispersed evenly in water. Although the type and the characteristic are not particularly limited, it is preferable to use an aramid fiber having a length of 3 to 6 mm and a denier of 1.5 to 2.0. The amount of the flask slurry is preferably such that the amount of the aramid polymer is 40 to 60% by weight and the amount of the flask slurry is 60 to 40% by weight in the total weight of the pulverized product pulverized by the rotary saw disk, It is preferred that the flux slurry is introduced so as to have an equivalent mass of 50 wt% each.

The injected flux slurry is homogeneously mixed with the aramid polymer while being subjected to the shearing force by the rotating sawtooth disc and the cone type milling apparatus, and uniformly dispersed to each other to increase the binding force of the aramid pulp. Further, the self-fibrillating of the flux slurry can increase the surface area of the pulp and increase the contact density between the fibers, thereby making it possible to produce a paper having excellent physical properties.

(C) Secondary grinding by cone type milling apparatus

Thereafter, the mixture of the aramid polymerized by the rotating saw disk and the flux slurry is subjected to a second milling process by a cone type milling apparatus. The cone type milling apparatus preferably rotates at a speed of 9000 to 15000 rpm to cut the aramid pulp at a uniform size while applying a uniform shear stress.

The subsequent pulp making process can be carried out according to the prior art by the apparatus of the present invention.

Aramid  pulp

Since the aramid pulp obtained by the apparatus and method for manufacturing an aramid pulp has a constant fiber length and fiber width, aramid pulp of uniform quality can be provided. Since the aramid pulp is manufactured by fibrillating more easily than the conventional pulp, Excellent strength and productivity of bar pulp excellent in bonding strength and dewaterability. In particular, the aramid pulp produced by the present invention may have a fiber length of 0.8 mm to 1.2 mm and a fiber width of 25 um to 35 um. When the fiber length of the pulp is more than 1.2 mm, the dispersibility is lowered and the non-impregnated portion is generated. However, if the fiber length is too small, there is a danger of deteriorating the function of the bond. In addition, the fiber length of aramid pulp has a great influence on the CSF. If the freeness is less than 200, there is a problem that the dehydration effect becomes ineffective and the paper production becomes ineffective or the productivity lowers. If the freeness is too high, There is a problem that physical characteristics and other electrical insulation are poor.

Hereinafter, the present invention will be described by way of examples. The following examples are intended to further illustrate the present invention more precisely and do not limit the scope of protection of the present invention. In the following Examples and Comparative Examples, various physical properties were measured by the following methods.

Example

Example  One

A meta-aramid composition prepared from m-phenylene diamine (MPD) and isophthaloyl chloride (IPC) is dissolved in dimethylacetamide (DMAc) .

The prepared meta-aramid dope was put into the pulp apparatus of FIG. 1 by using a mono pump for high viscosity, and was regulated constantly at a ratio of 15: 1. As the coagulating solution, a coagulating solution containing 30 parts by weight of dimethylacetamide relative to 100 parts by weight of water was used.

The loaded meta-aramid dope was cut with solidification in a rotary sawtooth disc and a cone type milling apparatus, and the speed range of the rotary sawtooth disc was maintained at 9000 to 15000 rpm in order to cut the aramid pulp to a uniform size.

Also, in addition to the above procedure, a floc slurry in which aramid staple fibers were dispersed in water in a gaseous state was introduced through a slurry inlet of a first drawing apparatus. The injected flux slurry had an equivalent mass of 50% by weight each with the aramid polymer.

Comparative Example  One

The aramid polymer prepared by mixing the dope and the coagulating liquid in the same manner as in Example 1 except that the dope and the coagulating liquid were passed through only the rotating saw tooth disc as in the prior art and the flux slurry had an equivalent weight of 50 wt% .

Comparative Example  2

The aramid pulp produced from the dope and the coagulating solution of Example 1 was mixed with the flux slurry so as to have an equivalent weight of 50 wt%, respectively, and then passed through a separate disc type milling apparatus.

The fiber length / fiber width and freeness of the meta-aramid pulp produced according to the above Examples were measured by the following methods and are shown in Table 1.

How to measure

Fiber length and fiber width

Fiber length and fiber width are measured by using optical fiber microscope to determine the shape of the pulp and fiber and the fiber length of the fiber sheet , The fiber length was measured, and the average length and distribution were measured.

Yeosu Island (CSF)

After the water content of the pulp was measured, 1 L of an aqueous solution having a solid content of 3 g was made, and the water was dropped freely into a water level meter (TAPPI T227). At this time, the higher the water content, the better the dehydration.

division Example Comparative Example 1 Comparative Example 2 Fiber length (mm) 0.926 1.23 0.86 Fiber width (um) 33.4 40.4 32.5 Yeosu Island CSF 220 412 159

In Table 1, the aramid pulp of Example 1 according to the present invention had a shorter fiber length and a narrower fiber width than the Comparative Example 1, and had a longer fiber length and a wider fiber width than Comparative Example 2. Such fiber length and fiber width have an influence on the freeness and the excellent dewatering property of the paper due to the excellent fineness of 220 will have a favorable influence on the formation of the paper and the strength of the paper.

In the case of Example 1 of the present invention, unlike the prior art, fibrillation of the added flux slurry is performed, and the aramid polymer and the flux slurry are simultaneously dispersed while being subjected to the shearing force, It will be effective.

4, it can be seen that the pulp of Example 1 of the present invention has a uniform fiber length and fiber width distribution. Thus, it can be seen that the present invention can increase the yield of pulp by producing aramid pulp having uniform physical properties.

Further, the pulp of the present invention increases the surface area of the pulp through self-fibrillation of the flux slurry and makes it possible to produce paper of excellent physical properties because the contact density between the fibers is increased.

1: Water inlet 2: Polymer solution inlet
3: disk assembly 4: rotating sawtooth disk
5: Cone type milling device 6: Outlet
7: Material filling space 8: Flux slurry inlet
31: cylindrical column 32: disk
33: a plurality of holes

Claims (11)

An apparatus for producing an aramid pulp comprising a rotating sawtooth disc (4) and a cone type milling apparatus (5), comprising a slurry inlet (8) located between the rotating sawtooth disc (4) and the cone type milling apparatus , And a slurry is injected into the slurry inlet (8).
The pulp making apparatus according to claim 1, wherein the pulp making apparatus comprises a water inlet (1), a polymer solution inlet (2), a disc assembly (3), a rotary sawtooth disc (4), a cone type milling device (5) And a raw material filling space (7)
The disk assembly 3 includes a cylindrical column 31 and a disk 32. The disk 32 has a plurality of holes 33 formed at a predetermined distance and spacing from the cylindrical column, Wherein water is passed through the inside of the cylindrical column, and an aramid resin solution passes through the hole.
The apparatus for producing an aramid pulp according to claim 1, wherein the flux slurry is uniformly dispersed with aramid fibers in water.
3. A method according to claim 1 or 2, characterized in that the rotary saw blade (4) rotates at a speed of 9,000 to 15,000 rpm in order to cut the pulp to a uniform size while applying a uniform shear stress to the pulp. Device.
An aramid pulp produced according to the apparatus of claim 4, wherein the fiber length is from 0.8 mm to 1.2 mm and the fiber width is from 25 μm to 35 μm.
A method for producing an aramid pulp by applying a shear force to a mixed composition of aramid dope and coagulating liquid, the method comprising the further step of adding a flux slurry when the mixed composition is pulverized by a shear force, Wherein the flux slurry is uniformly mixed and dispersed by a shear force.
7. The method of claim 6, wherein the flux slurry is uniformly dispersed with aramid fibers in water.
The method according to claim 6, wherein the ratio of the aramid dope to the coagulating liquid is a ratio of 10: 30 to 1: coagulated liquid.
9. The method of claim 8, wherein the aramid dopant is a meta-aramid composition prepared from m-phenylene diamine (MPD) and isophthaloyl chloride (IPC) in an amide solvent such as dimethyl acetamide : DMAc). ≪ / RTI >
The method according to claim 8, wherein the coagulating solution comprises 30 parts by weight or less of dimethylacetamide as an amide solvent, relative to 100 parts by weight of water.
An aramid pulp produced by the process according to any one of claims 6 to 10, wherein the fiber length is from 0.8 to 1.2 mm and the fiber width is from 25 to 35 μm.

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