JP2002018838A - Method for manufacturing thermosetting resin molding material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a thermosetting resin molding material in which occurrence of a fine powder is low. SOLUTION: A method for manufacturing the thermosetting resin molding material comprises the steps of rolling the molding material of a molten state in a predetermined thickness, processing the material in a wheat flour state of a predetermined with or a rugged sheet-like state having cutouts of a predetermined width, and then cutting the material in a predetermined length. A feeding speed of the molding material in a next cutting step is accelerated faster than that of the molding material in the step of processing the material in the wheat flour state or the rugged sheet-like state, and an apparatus used for the method is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for producing a granular molding material by melting and kneading a thermosetting resin molding material such as a phenol resin and then continuously granulating the same. Another object of the present invention is to provide a method and an apparatus for continuously producing a thermosetting resin molding material with less generation of fine powder during transfer between processes and after production.

Conventionally, a thermosetting resin molding material is generally mixed, kneaded, cooled and then taken out into a lump or a sheet after mixing the raw materials, and then pulverized to a certain particle size after cooling. The fine powder generated at the time of pulverization and after the production lowers the yield, and the fine powder generated by vibration during transportation after packaging and shipping is floating as dust at the time of handling, which is not preferable for environmental hygiene. Granulation of a thermosetting resin molding material by an extrusion granulation apparatus is preferable from the viewpoint of environmental hygiene, since generation of fine powder is relatively small, but productivity is low and improvement thereof is desired.

[0003]

SUMMARY OF THE INVENTION In view of the above-mentioned problems, the present invention is to roll a molding material to a constant thickness with a rolling roll, and to maintain a proper temperature at a noodle-like processing or irregularity having a predetermined width. Processing, and then continuous cutting with a cutter blade or grooving roll to a predetermined length, it is possible to obtain a molding material with an arbitrary particle size, and at the same time, it is possible to continuously operate for a long time, and to obtain heat with good productivity. A method and an apparatus for granulating a curable resin molding material are provided.

[0004]

SUMMARY OF THE INVENTION The present invention relates to a method and an apparatus for granulating a thermosetting resin molding material,
The molten molding material is rolled to a predetermined thickness, processed into a noodle shape with a predetermined width or processed into an uneven sheet shape having a cut with a predetermined width, and subsequently cut into a specific length of a thermosetting resin molding material. In the manufacturing method, a method for producing a thermosetting resin molding material, wherein the feeding speed of the molding material in the next cutting step is set to be higher than the feeding speed of the molding material in the step of processing into noodles or an uneven sheet shape, And a rolling roll (A) for rolling the molten molding material to a predetermined thickness, and for processing the rolled molding material into a noodle shape having a predetermined width or an uneven sheet shape having cuts at predetermined intervals. Thermosetting resin molding having a slitter or grooving roll (B) and a cutter blade or grooving roll (C) for cutting a molding material processed into a noodle-like or uneven sheet shape into a predetermined length. A thermosetting resin molding material manufacturing apparatus characterized in that a feed speed of a cutter blade or a grooving roll (C) is made higher than a feeding speed of a slitter or a grooving roll (B). It is.

One of the features of the present invention is that a thermosetting resin molding material melt-kneaded with general equipment such as a kneading roll, a single-screw extruder, a twin-screw kneading extruder, a planetary kneading extruder, a coneder, etc. Rolling with a roll (A) maintained at a temperature that maintains the softness necessary for the processing in the process, stabilizes the noodle-like processing or unevenness processing by the slitter or groove roll in the next step, and at the same time, the molding material And it is possible to obtain a granular molding material that hardly loses its shape due to impact, friction and the like received in a later step, and that generates less fine powder. As for the temperature control of the rolling roll, a roll having a built-in hot water or steam circuit is generally used, and the set temperature varies depending on the formulation of the molding material and the amount of volatile components. ℃ -1
About 30 ° C. is preferable.

[0006] The molding material which is rolled to a predetermined thickness by a rolling roll and has a softness necessary for noodle-like processing or concavo-convex processing is prepared by a slitter or a grooving roll (B). Processing. The shape of the molding material after this treatment is preferably a noodle shape, but may be a concavo-convex sheet shape that is easy to adjust and manage equipment as long as it is easily separated at the time of post-process and transfer between processes.

[0007] Further, a molding material which has been processed in a width direction by a slitter or a grooving roll into a noodle-like or concavo-convex sheet-like shape and which has a softness necessary for cutting is provided.
It is continuously cut to a predetermined length by a cutter blade or a groove cutting roll (C). In this process, as the cutting length becomes smaller, the molding material adheres to the cutter blade or the grooving roll and clogging easily occurs. However, the surface is cooled by cooling the surface of the cutter blade or the grooving roll with air or cold air. Clogging can be prevented. Furthermore, in the case of a cutter blade or grooving roll and a cutting board roll, by heating the cutting board roll provided with a scraper, the molding material cut or cut by the grooving roll once adheres to the cutting board roll, Clogging of the grooving roll can be prevented.

In the granulation method of the present invention, a predetermined particle size is continuously formed by the widthwise processing by the slitter or the grooving roll (B) and the lateral processing by the cutter blade or the grooving roll (C). The resulting molding material has such features that the particle end faces are smooth, are not easily broken by impact, vibration, friction, or the like during a post-process or during transfer, and are less likely to generate fine powder.

In the present invention, the feed speed of the cutter blade or the grooving roll (C) for cutting is made higher than the feed speed of the slitter or the grooving roll (B) for processing into a noodle-like or uneven sheet shape. In addition, the number of blades of the grooving roll can be reduced, the grooving of the roll becomes easy, and clogging of the grooving roll by the molding material is less likely to occur. The ratio of the feed speed of the cutter blade or the grooving roll (C) to the feed speed of the slitter or the grooving roll (B) is not particularly limited, and the particle diameter of the final molding material, the cutter blade or the grooving. The speed is appropriately determined according to the pitch between the grooves of the roll (C) and the like, but is usually 2 to 30 times the speed.

Hereinafter, the present invention will be described with reference to the drawings.
Each drawing shows a specific example of the granulating apparatus used in the present invention. FIG. 1 is a schematic front view, and FIGS. 2 and 3 are schematic perspective views. In the cutting step, FIG. 2 shows a combination of a rotating cutter blade 4a and a cutting board roll 4b, and FIG. 3 shows a combination of a cutter blade 4a and a fixed blade 4c. In practice, the specific equipment used in each step may be appropriately selected according to the desired particle size of the molding material, the compounding recipe, the amount of volatile components, the temperature during each processing, the target processing capacity of the apparatus, and the like.

The thermosetting resin molding material 1a in a molten state is
It is rolled to a predetermined thickness by the rolling roll 2. The rolling roll 2 has a scraper 5a for forcibly removing the rolled molding material from the roll. Subsequently, the sheet is processed into a noodle shape with a predetermined width or an uneven sheet shape having cuts at predetermined intervals by a slitter or a groove cutting roll 3a. Grooving roll 3a
Is a molding material 1b processed into a noodle shape or an uneven sheet shape.
Is provided with a scraper 5b for forcibly peeling off from the grooving roll 3a. The grooving roll 3a is preferably used as a pair of grooving rolls 3a, 3a, as shown in FIG. 2, so that the grooving roll 3a has a maximum processing ability. However, a combination of the grooving roll 3a and the cutting roll 3b is also selected. I can do it. In this case, the adjustment and management of the cutting edge of the grooving roll and the function management of the scraper 5b are easy.

Further, the molding material 1b processed into the noodle-like or uneven sheet-like shape is cut into a cutter blade or a grooving roll 4.
Cut to a predetermined length in a. At this time, a combination of a rotating cutter blade and a cutting board roll or a combination of a rotating cutter blade and a fixed blade can be selected.
By cooling the surface with air or cold air, it is possible to prevent cutting defects due to material adhesion.

The thermosetting resin used in the present invention is typically a phenolic resin, but may be an epoxy resin, a polyimide resin, a polyester resin, or the like. In the case of a novolak phenolic resin, hexamethylenetetramine is generally used as a curing agent, but is not limited thereto. Examples of fillers include glass fibers, calcium carbonate, clay, mica, and silica for inorganic substances, and wood powder, pulp, woven fibers, and cured thermosetting resins for organic substances.

[0014]

EXAMPLES 34 parts by weight of a powdery phenol resin, 6 parts by weight of a powdery curing agent (hexamethylenetetramine), 55 parts by weight of an inorganic base material (glass chop, clay), and other additives (curing aids, 5 parts by weight of a releasing agent and a coloring agent) were mixed by a blender and then melt-kneaded by a heating roll.
This was immediately charged into a rolling roll having a temperature of 80 ° C. and a roll gap of 2 mm and rolled. Subsequently, two grooving rolls (with a roll gap of 0 mm) each having a scraper and having a pitch between grooves of 2 mm are continuously processed into a noodle shape, and the molding material processed into the noodle shape is blown with compressed air. The thus-cooled cutter blade having a groove pitch of 10 mm was rotated at a gap of 0.2 mm between the fixed blade and cut. The feed speed of the cutter blade was about seven times that of the grooving roll. The obtained granular molding material was treated with a rotating small mixer for 15 minutes. Next, the particles were sieved with a vibrating sieve and the particle size distribution was confirmed.
The rate of occurrence of fine powder having a size of μm or less was 1% or less.

[0015]

According to the method and apparatus for producing a thermosetting resin molding material of the present invention, the generation of fine powder, which has been generated by 10% or more in the conventional production system, can be reduced to the utmost. Continuous granulation can be stably performed for a long time. Therefore, the production efficiency can be greatly improved, and this is also preferable in terms of environmental hygiene. Since the equipment is simple and compact, the equipment investment can be reduced.

[Brief description of the drawings]

FIG. 1 is a schematic front view of a granulating apparatus (one example) used in the present invention.

FIG. 2 is a schematic perspective view of a granulating apparatus (one example) used in the present invention.

FIG. 3 is a schematic perspective view of a granulating apparatus (another example) used in the present invention.

DESCRIPTION OF THE SYMBOLS 1a Thermosetting resin molding material in melted and kneaded state 1b Thermosetting resin molding material processed into noodle shape or uneven sheet shape in width direction 1c Thermosetting resin cut in length direction Resin molding material 2 Rolling roll 3a Grooving roll 3b Cutting board roll 4a Cutter blade 4b Cutting board roll 4c Fixed blade 5a Scraper 5b Scraper (grooving) 5c Scraper

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 4F201 AA37 AA39 AA40 AB03 AB12 AB25 AM32 BA02 BC01 BC12 BC38 BL07 BL08 BL25 BL37 BL43 BM07

Claims (3)

[Claims] 1. Thermosetting in which a molding material in a molten state is rolled to a predetermined thickness and processed into a noodle shape having a predetermined width or processed into an uneven sheet shape having cuts having a predetermined width, and then cut into a specific length. Thermosetting resin molding, wherein the feeding speed of the molding material in the next cutting step is higher than the feeding speed of the molding material in the step of processing into noodles or an uneven sheet shape in the method for producing a curable resin molding material. Material manufacturing method. 2. A rolling roll (A) for rolling a molten molding material to a predetermined thickness, processing the rolled molding material into a noodle shape having a predetermined width, or forming an uneven sheet having cuts at predetermined intervals. A thermosetting resin having a slitter or grooving roll (B) for processing, and a cutter blade or grooving roll (C) for cutting a molding material processed into a noodle-like or uneven sheet shape into a predetermined length. An apparatus for manufacturing a thermosetting resin molding material, wherein the feed speed of a cutter blade or a grooving roll (C) is higher than the feed speed of a slitter or a grooving roll (B). 3. The apparatus for producing a thermosetting resin molding material according to claim 2, wherein the cutter blade or the grooving roll (C) has a mechanism for preventing clogging with the molding material.