JP2002370228A - Method for conveying adhered material formable substance and method for manufacturing using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for conveying an adhered material formable substance for forming an adhered material in the case of conveying by a vibration type conveyor having a trough surface made of a steel material capable of stably conveying the substance without forming the adhered material and to further provide a method for manufacturing a thermoplastic resin to supply a raw material to an extruder by using the conveying method. SOLUTION: The method for conveying the adhered material formable substance comprises a step of conveying the substance (substance A) for forming the adhered material on the surface of the trough by using a vibration type conveyor (conveyor (b)) having the trough surface which has a dynamic frictional coefficient with an S45C steel material of 0.05 to 0.3 at the time of conveying by using the vibration type conveyor having the trough surface made of a steel material. The method for manufacturing the thermoplastic resin composition comprises a step of supplying the substance A to the extruder by using such a conveying method.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for transferring an object using a vibration type transfer device. More specifically, the present invention relates to a method of transporting a substance (hereinafter referred to as a "fixed substance forming substance") in a commonly used steel trough, which forms the adhered substance, and further extrudes a raw material using the transport method. The present invention relates to a method for producing a thermoplastic resin to be supplied to a machine.

[0002]

2. Description of the Related Art In general, thermoplastic resins have good workability, light weight, electrical insulation, water resistance, heat insulation, and corrosion resistance. Therefore, thermoplastic resins are used as an alternative material to metals, glass, ceramics, and wood. Electronic parts, mechanical parts, OA parts, medical parts,
Used in all fields, such as automotive parts. Further, in order to further impart various functions, in many cases, it is produced by blending a flame retardant, an antistatic agent, a lubricant, a slidability imparting agent, a compatibilizer, a release agent, and the like. At the time of such production, a method is generally used in which various raw materials to be blended in the thermoplastic resin are supplied to an extruder by a feeder in a fixed amount and melt-kneaded.

[0003] As such a feeder, a vibratory transfer device is mentioned as one of them. However, in the case of some raw materials, when supplied by such a vibratory transfer device, there is a problem that a fixed substance is formed in a trough portion and the supply flow rate is not stable. That is, there is a demand for a method of transporting such a substance for forming a fixed substance without forming a fixed substance.

Japanese Patent Laid-Open Publication No. Hei 8-239112 discloses that
In particular, a vibrating transfer device suitable for an ashtray in a pachinko game arcade is described. This publication further describes that by forming the trough surface with a non-adhesive substance such as polytetrafluoroethylene, good transport is possible even when an adhesive substance such as gum is introduced. However, the publication does not sufficiently disclose a method of transporting the substance for forming a fixed substance without forming a fixed substance.

[0005]

SUMMARY OF THE INVENTION According to the present invention, it is possible to stably transport a substance forming a fixed substance which forms a fixed substance without forming a fixed substance in the transfer of a vibratory transfer apparatus having a trough surface made of steel. Another object of the present invention is to provide a method for producing a thermoplastic resin which supplies a raw material to an extruder by using the conveying method.

[0006] In order to solve such a problem, the present inventors have thoroughly studied the formation of a fixed substance. As a result, it has been found that such an adhered substance is generated particularly in a substance having a relatively low melting point and containing a fine powder. From this, the present inventors considered the mechanism of generation of the adhered matter as follows. That is, the frictional heat at the contact portion between the vibrating trough surface and the conveyed substance melts the substance, thereby causing the substance to adhere to the trough surface and further depositing the substance on the closely adhered part. This is caused by From such a viewpoint, the present inventors have focused on the friction coefficient of the trough surface of the vibratory feeder, and as a result of intensive studies, they have found that the above problem can be brilliantly solved by setting the trough surface to a constant dynamic friction coefficient or less. Reached.

[0007]

According to the present invention, when a trough surface is conveyed by using a vibratory conveyance device made of steel, a substance (substance A) which forms a fixed substance on the trough surface is converted into S45.
The present invention relates to a method for transporting a substance capable of forming a fixed substance, which is transported by using a vibratory transport device (transport device b) having a trough surface having a dynamic friction coefficient with a C steel material of 0.05 to 0.3.

Further, the present invention relates to the above-mentioned conveying method, wherein the dynamic friction coefficient of the trough surface of the conveying device b is preferably 0.05 to 0.15.

Further, the present invention more preferably relates to the above-mentioned conveying method, wherein the trough surface of the above-mentioned conveying device b is substantially formed of polytetrafluoroethylene.

The present invention further relates to the above-mentioned transport method, wherein the substance A is a fine powder having a melting point of 45 to 120 ° C. or a substance capable of generating the fine powder by vibration.

[0011] The present invention also provides the above-described transport method,
The present invention relates to a method for producing a thermoplastic resin composition by supplying a substance A to an extruder.

Hereinafter, the present invention will be described in detail.

In the transport method of the present invention, the substance A to be transported is a substance that forms a fixed substance on the trough surface when transported by using a vibratory transport apparatus whose trough surface is made of steel. Usually, the trough surface is formed of stainless steel such as SUS304 steel. A substance on which a fixed substance is formed by transport using a vibration type transport apparatus having such a general trough surface corresponds to the substance A of the present invention. The formation of such a fixed substance differs depending on the temperature of the environment and the transport speed, but a more preferable embodiment of the substance A in the present invention includes a substance having a melting point of 45 to 120 ° C. The substance A is more preferably a substance having a melting point of 55 to 115 ° C. A substance having such a melting point is easily melted by frictional heat generated between the trough surface and the surface during transportation, and adhesion to the surface is recognized even after transportation for several hours even at a general atmosphere temperature of 20 to 40 ° C. It is. The melting point is determined according to JIS K71.
21 to 20 ° C./m using a DSC device
It is the value of the melting point peak when the temperature is raised at the rate of temperature increase of "in".

Further, as the substance A, a substance containing a fine powder or a substance capable of generating the fine powder by vibration during transportation is preferable. This is because such a substance tends to stick during transportation. Although the reason for this is not sufficiently clear, it is considered that in the case of a fine powder, the adhesion easily occurs even if the substance is slightly melted. More specifically, the particle size of the fine powder is 1 to 500 μm
And a range of 3 to 300 μm is more preferable. Further, the amount of the fine powder is preferably 3% by weight or more with respect to 100% by weight as a whole, which is a more suitable object for exhibiting the effects of the present invention.

Further, as the form of the substance A, a single compound, a mixture of two or more compounds, a composition in which two or more compounds are integrated, and a composite in which different layers are integrated ( And the like, in which a different material is formed on the surface layer.

From the above, as the substance A of the present invention, a fine powder having a melting point of 45 to 120 ° C. or a substance capable of forming the fine powder by vibration can be mentioned. A range of 500 μm is appropriate.

Here, as a substance capable of producing fine powder by vibration, the product is a lump, a granular material obtained by pulverizing the lump, and the product is a fine powder, and the fine powder is granulated. Granular bodies and the like can be mentioned. Examples of the pulverization method include various types of pulverizers, and examples of the granulation method include a granulation method using an extruder or a briquetting machine.

Next, a description will be given of a vibratory transfer device (transfer device b) comprising a trough surface having a dynamic friction coefficient with S45C steel material of 0.05 to 0.3 used in the present invention. The coefficient of kinetic friction of the trough surface used in the transfer device b is determined by a method based on JIS K7218. That is, the dynamic friction coefficient of the trough surface is determined by a test method in which a test piece on a square plate is fixed on a steel base and an S45C hollow cylinder is used as a counterpart steel material. The conditions for such a test are a load of 50 N and a peripheral speed of 0.5 m / s. The dynamic friction coefficient is obtained from the relationship between the load and the detected torque in such a test.

The coefficient of friction between the trough surface and the S45C steel obtained by the above test method is 0.05 to 0.1.
5 is more preferred. The lower the coefficient of friction, the more the frictional heat can be reduced. For example, even when the ambient temperature of the transfer is high, the sticking is less likely to occur.

As the material forming the trough surface, specifically, polymers such as polytetrafluoroethylene, polyethylene, polyamide, and polyacetal can be suitably mentioned. Further, there may be mentioned a polymer composition obtained by mixing such a polymer with another polymer. Further, a polymer composition obtained by mixing oil, wax, or the like in a polymer can be used. Among the above, polytetrafluoroethylene can be particularly preferably cited as a material forming the trough surface, that is, a transfer device in which the trough surface is substantially formed of polytetrafluoroethylene is a transfer device b of the present invention. It can be mentioned as a preferred embodiment.

If the surface of the trough in the transfer device b of the present invention satisfies the above condition of the dynamic friction coefficient,
It may be in any surface condition. That is, it may be one having irregularities formed on the surface. However, smoothness is preferable because smooth conveyance is possible.

In the transfer device b of the present invention, the trough surface only needs to satisfy the above conditions, and the trough body may be formed of any material. However, also in the trough of the transfer device b, the trough body is preferably made of steel such as stainless steel, like the trough of the normal transfer device.

Therefore, a preferred embodiment of the trough of the present invention is a structure in which polytetrafluoroethylene is laminated on the surface of a steel trough body. As a structure of such a laminate, a structure in which a polytetrafluoroethylene sheet is provided with an adhesive layer on the trough surface and affixed thereto, and a structure in which polytetrafluoroethylene powder is coated on the trough surface and baked, are preferable. It is listed.

In the present invention, when the ambient temperature is high, it is effective to employ various methods for lowering the temperature of the trough surface in order to prevent the substance A from melting on the trough surface. Specifically, a method of passing cold air through the trough to lower the temperature of the trough surface can be used.

The present invention also provides a method using the above-described transport method.
The present invention relates to a method for producing a thermoplastic resin composition by supplying a substance A to an extruder. The sticking of the substance A during transport is particularly problematic when the transport amount needs to be controlled with extremely high precision. As a typical example requiring such accurate conveyance, production of a thermoplastic resin composition can be mentioned.

Examples of the thermoplastic resin used in the thermoplastic resin composition include various thermoplastic resins. Specific examples include polyethylene resins, polypropylene resins, ethylene-propylene copolymers, polystyrene resins, and diene resins. Thermoplastic graft copolymer (ABS resin) obtained by grafting a vinyl cyanide compound and an aromatic vinyl compound to a system rubber component, AES resin, AS resin, A
SA resin, acrylic resin such as polymethyl methacrylate, polymethyl pentene resin, polyamide resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyarylate resin, polyacetal resin, aromatic polycarbonate resin, polyphenylene ether resin, polysulfone resin, polyphenylene sulfide resin , Polyethersulfone resin, polybutadiene, and the like, and various copolymers, mixtures, and modified products of these polymers. Further, there can be mentioned those obtained by combining two or more kinds of these thermoplastic resins.

The resin composition may contain various stabilizers, impact modifiers, flame retardants, antistatic agents, fluidity modifiers, mold release agents, coloring agents, and reinforcing fillers (glass fibers,
Carbon fiber, talc, mica, wollastonite, etc.).

Conventionally, the extruder was stopped every time the metering of the substance A became unstable due to sticking, and the trough had to be cleaned.
Is supplied to the extruder, such a stop can be eliminated, and more efficient extrusion production of the thermoplastic resin composition becomes possible.

[0029]

The present invention will be described in more detail with reference to the following examples.
As the supply device, a vibration-type supply device of a loss-in-weight type (manufactured by Daiwa Seiko Co., Ltd .; model LVF-200B) was used. The dimensions of the trough are 160mm wide x 60mm deep
X Length was 550 mm. Of the inner surface of the trough, a portion of the trough contacting the raw material was coated with the resin material shown in Tables 1 and 2. After feeding the raw materials described in Tables 1 and 2 into the hopper, the feed rate was kept constant and 3
The output change of the vibration supply device after time and after 6 hours was examined. In addition, the state and amount of adhesion of the raw material to the trough surface after 6 hours from the start of supply were examined. Details of the evaluation items are as follows.

(1) Output change of the supply device The output change of the supply device after 3 hours and 6 hours from the start of the supply is measured by the vibration type supply device panel (LEC) manufactured by Daiwa
-100). Such output is a maximum output of 10
It was shown as a percentage of 0%. Here, the output change is caused by an increase in conveyance resistance due to the presence of the adhered matter. A change in the output causes a variation in the supply amount, and eventually reaches 100%, so that a predetermined supply amount cannot be supplied.

(2) Attachment of Raw Material to Trough Surface The state of attachment of the raw material to the trough surface six hours after the start of supply was confirmed, and the amount of the attached material was measured. The amount of the deposit on the trough surface was determined by carefully scraping the deposit from the surface using a spatula and measuring the weight.

Symbols indicating coating materials and raw materials shown in Tables 1 and 2 are as follows. PTFE: 1 mm-thick sheet made of polytetrafluoroethylene PC: 1 mm-thick sheet made of aromatic polycarbonate resin Flame retardant-1: "ADEKA STAB FP" manufactured by Asahi Denka Kogyo KK
−500 ”(a form in which a lump is pulverized to generate fine powder by vibration, the particle diameter of the fine powder: about 150 μm, the melting point: 97 ° C. The particle diameter of the fine powder is a transfer device composed of a SUS304 trough. The sample when conveyed was sieved and the weight average was determined for particles having a particle size of 500 μm or less.) Flame retardant-2: “Fireguard FG-” manufactured by Teijin Chemicals Ltd.
3100 "(the form in which the fine powder is granulated, the particle diameter of the fine powder:
About 200 μm, melting point: 108 ° C. The calculation of the particle diameter is the same as in the case of the flame retardant-1. )

[0033]

[Table 1]

[0034]

[Table 2]

Further, using the method of the present invention, a thermoplastic resin composition containing flame retardant-1 was produced. The thermoplastic resin composition has the following PC: 63.395 parts by weight, Ni-CF: 15 parts by weight, WAX: 0.5 parts by weight,
Flame retardant-1: 9 parts by weight, rubber: 6.5 parts by weight, ADA:
0.5 parts by weight, 0.1 part by weight of ST-1, 5 parts by weight of CB, and 0.005 parts by weight of ST-2. Each of the above-mentioned raw materials was supplied to the extruder by the following supply method.

Ni-CF was independently supplied into the molten resin from the second supply port connected to the side feeder using a vibration type transporter. Flame retardant-1 was independently supplied from the first supply port using a vibratory transfer machine in which a sheet of polytetrafluoroethylene was coated on the trough surface. WAX, ST-
1 and ST-2 were individually mixed with the master blend obtained by premixing with the PC 10 times the amount of the PC in the composition from the first supply port using a screw conveyor. (A supermixer was used for premixing). The ADA supplied the master blend, which was 2.5% by weight based on the weight of the PC, from the first supply port using a screw-type conveyor alone. The rubber was independently supplied from the first supply port. CB was independently supplied from the second supply port.
The remaining PC excluding the amount used in the master agent was independently supplied from the first supply port using a screw-type transporter.

This extrusion is performed by a vent type twin screw extruder (manufactured by
Using Nippon Steel Works; TEX-65α), discharge rate 50
The test was performed at 0 kg / h. Although such extrusion was performed continuously for 48 hours, no deposits were formed on the surface of the trough of the vibration type transporter for the flame retardant-1, and stable production was always possible.

The contents of each symbol of the raw materials in the thermoplastic resin composition are as follows. PC: viscosity average molecular weight 1 produced by phosgene method
9.500 bisphenol A type aromatic polycarbonate resin powder (using p-tert-butylphenol as a terminal stopper) Ni-CF: nickel-coated carbon fiber (Vesfight MCHTA-C6-US manufactured by Toho Rayon Co., Ltd.)
(I), sizing agent composed of epoxy resin and urethane resin, diameter 7.5 μm, length 6 mm) WAX: copolymer of maleic anhydride and α-olefin (Diacarna PA30M manufactured by Mitsubishi Chemical Corporation) Rubber: Composite rubber-based graft copolymer (METABLEN S-2001 manufactured by Mitsubishi Rayon Co., Ltd.) ADA: Polytetrafluoroethylene having fibril-forming ability (Polyflon MPA manufactured by Daikin Industries, Ltd.)
FA-500) ST-1: Trimethyl phosphate (TMP manufactured by Daihachi Chemical Industry Co., Ltd.) ST-2: Phosphonite antioxidant ("Sandstub P-EPQ PLUS" manufactured by Clariant Japan KK) CB: Carbon black Master (carbon black 4
0% by weight, and 60% by weight of an aromatic polycarbonate resin having a viscosity average molecular weight of 15,000)

[0039]

As is apparent from the above description, according to the present invention, a substance capable of forming a fixed substance which forms a fixed substance on the surface of a trough when conveyed by a normal vibratory conveying apparatus is extremely reduced without generating such a fixed substance. A transport method capable of stably transporting is provided. Such a transfer method of the present invention is extremely suitable in a field where high-precision transfer is continuously required for a long time. One of the typical examples is supply of raw materials to an extruder when producing a thermoplastic resin composition. As is clear from the above, the method for producing a thermoplastic resin composition using the transport method of the present invention does not cause any problem even when the supply of the substance for forming a fixed substance is necessary, Is possible. Such a production method further stabilizes the supply amount of the raw materials to the extruder, and as a result, provides a thermoplastic resin composition with less variation in composition ratio than before. Furthermore, the production method of the present invention eliminates the need for temporary suspension of production, which has been conventionally performed for removing adhered substances, and brings about a great improvement in production efficiency. Therefore, the industrial effects achieved by the present invention are outstanding.

 ────────────────────────────────────────────────── ─── Continued on the front page F term (reference) 4F201 AB05 AB06 AB09 AB11 AB12 AB16 AB25 AC01 AC04 AJ03 AJ09 AJ14 AR20 BA06 BC01 BC12 BD05 BQ04 BQ14 BQ57

Claims (5)

[Claims] When a trough surface is transported by using a vibratory transport device made of steel, a substance (substance A) which forms a fixed substance on the trough surface has a dynamic friction coefficient with S45C steel of 0.05 to 0. 3. A method of transporting a substance forming a fixed substance, which is transported by using a vibratory transport device (transport device b) having a trough surface. 2. The transfer method according to claim 1, wherein the dynamic friction coefficient of the trough surface of the transfer device b is 0.05 to 0.15. 3. The transfer method according to claim 1, wherein the trough surface of the transfer device b is substantially formed of polytetrafluoroethylene. 4. The transport method according to claim 1, wherein the substance A is a fine powder having a melting point of 45 to 120 ° C. or a substance capable of generating the fine powder by vibration. 5. A method for producing a thermoplastic resin composition, comprising supplying a substance A to an extruder by using the conveying method according to any one of claims 1 to 4.