JP2930231B2 - Injection molding resin material and method of manufacturing the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a resin material for injection molding suitable for molding interior parts for automobiles having a high tactile sensation and a method for producing the same.

[0002]

2. Description of the Related Art Various interior parts are installed in a vehicle interior. Recently, a complicated curved surface shape is required and the weight of a vehicle is promoted.
It has become mainstream to use injection molded articles of synthetic resins such as resin and ABS resin.

Further, in order to impart a good touch to the surface of the above-mentioned synthetic resin injection-molded article, a resin material for injection molding mixed with protein powder has been used.

As shown in FIG. 4, a thermoplastic resin A such as a PP resin or an ABS resin, a reinforcing filler B such as talc or charcoal, and a protein powder C are placed in a Henschel mixer 1 as shown in FIG. Are mixed in a predetermined amount and mixed, and then the mixed materials are supplied into a hopper 2a of the extruder 2, weighed by a fixed-quantity feeder 2b, kneaded in the extruder 2, and then passed through a die 2c. The rod-shaped resin molded product 3 is extruded, and the cooling water tank is
After cooling to a predetermined temperature within the pellets, the pellets are put into a pellet 6 state by a pelletizer 5 and dried by a dryer 7 to
Manufactures high-tactile resin materials for injection molding.

In the drawing, reference numeral 8 denotes a stock box for storing pellets 6 of a resin material for injection molding having a high touch.

[0006]

However, the thermoplastic resin A, the reinforcing filler B,
In the method of mixing, kneading, and pelletizing the protein powder C, the kneading step performed by the extruder 2 is 25%.
Since the heat resistance temperature of the protein powder C is about 220 ° C., the protein powder c is thermally decomposed, and when the final product is formed by injection molding, a high tactile sensation is obtained on the product surface. There was a problem that it could not be obtained.

The present invention has been made in view of such circumstances, and has as its object to provide a resin material for injection molding suitable for an injection-molded article having a good surface feel, and a method for producing the same.

[0008]

In order to achieve the above object, the resin material for injection molding according to the present invention is obtained by mixing 50 to 100 parts by weight of a thermoplastic resin with 50 to 0 parts by weight of a reinforcing filler. Characterized in that protein powder is adhered to the outer surface of the resin pellet produced in the above manner.

Further, the method for producing a resin material for injection molding comprises a mixing step of mixing 50 to 100 parts by weight of a thermoplastic resin with 50 to 0 parts by weight of a reinforcing filler using a Henschel mixer or the like; A kneading step of kneading the mixed material with an extruder, and passing the rod-shaped resin material extruded from the extruder through a protein powder adhering machine, thereby adhering the protein powder to the outer surface of the resin material. It is characterized by comprising a protein powder attaching step, and a pelletizing step of pelletizing with a pelletizer after cooling in a cooling step and drying.

The thermoplastic resin used in the present invention includes:
PP resin, ABS resin and the like are suitable, and if desired, reinforcing fillers such as talc and charcoal may be appropriately mixed in,
The mixing ratio of the reinforcing filler may be in the range of 0 to 50 parts by weight, preferably 10 to 15 parts by weight with respect to the total weight. The mixing ratio of the reinforcing filler is appropriately determined depending on factors such as required rigidity, freedom of molding, and cost.

Further, the amount of protein powder adhering to the outer surface of the resin pellet may be in the range of 10 to 30 parts by weight based on the total weight of the pellet, particularly preferably 20 to 30 parts by weight.
It is around the weight part.

[0012]

As is apparent from the above constitution, according to the method of the present invention, when pelletizing the resin material for injection molding,
After the kneading process by the extruder to which high temperature is added,
Since the protein powder having poor heat resistance is adhered, it is possible to form an injection molded article having a high tactile sensation without thermal decomposition of the protein powder.

[0013]

EXAMPLES Examples of the resin material for injection molding according to the present invention and a method for producing the same will be described below.

The resin material for injection molding according to the present invention is PP
It is characterized in that protein powder is adhered to the outer surface of resin pellets produced by mixing reinforced fillers such as talc and charcoal into thermoplastic resin such as resin and ABS resin, if desired, if necessary. It is.

That is, since the resin material and the protein powder are not kneaded and processed at a high temperature unlike the conventional resin material containing the protein powder, it is possible to suppress the thermal decomposition of the protein powder having relatively low heat resistance. And a high-tactile injection molded article can be formed.

Next, an embodiment of the method for producing the resin material for injection molding will be described in detail with reference to FIGS.

First, as shown in FIG. 1, a thermoplastic resin 11 such as a PP resin or an ABS resin and a reinforcing filler 1 such as talc and charcoal are placed in a Henschel mixer 10.
2 is mixed in an appropriate amount and mixed.

At this time, the mixing ratio of the thermoplastic resin 11 and the reinforcing filler 12 can be freely selected depending on the degree of freedom of molding, rigidity, etc. of the final product. Reinforcing filler 1 per part by weight
2 is preferably in the range of 15 to 10 parts by weight.

Next, the mixed material 13 having undergone the mixing step by the Henschel mixer 10 is supplied to an extruder 20, where the thermoplastic resin 11 and the reinforcing filler 12 are kneaded.

More specifically, the mixed material 13 mixed in the mixing step is supplied to a hopper 21 of an extruder 20, and the supply amount is adjusted by a fixed amount feeder 22.
After being kneaded at a high temperature of 0 to 260 ° C., it is extruded as a rod-shaped resin material 24 through a die 23.

Thereafter, when the rod-shaped resin material 24 extruded from the die 23 of the extruder 20 passes through the protein powder adhering machine 30, the protein powder P adheres to the outer surface of the resin material 24 at a predetermined ratio. Then, it is cooled to a predetermined temperature in the cooling water tank 40, and then the pelletizer 5
After the resin pellets 51 having an appropriate particle size are formed according to 0 and dried in the dryer 60, the resin pellets 51 are supplied to the stock box 70 by air to complete the production of the resin material for injection molding.

Next, the step of adhering protein powder P, which is a characteristic part of the method of the present invention, will be described in detail with reference to FIG. 2. In the powder adhering machine 30, air is supplied from a compressor 31 at a predetermined pressure. The configuration is such that the protein powder P in the powder supply tank 32 is similarly supplied into the powder applying machine 30, and the supply amount of the protein powder P supplied from the powder supply tank 32 to the powder applying machine 30 depends on the amount of the powder applying machine. 30
The concentration of the protein powder P is detected by a concentration measuring device 33, and when the concentration is lower than a set reference concentration, a signal is sent from a control device (not shown) to an opening / closing valve 35 installed in a powder supply pipe 34, and the Is always in a state where a certain amount of the protein powder P is diffused in the powder adhering machine 30.

Then, the rod-shaped resin material 24 extruded from the extruder 20 is placed in the powder adhering machine 30 within 0.05 to
The resin powder 24 is supplied at a transport speed of 0.1 m / s, and a substantially constant amount of the protein powder P adheres to the outer surface of the resin material 24.

In the process of adhering the protein powder P, the concentration measuring device 33 and the opening / closing valve 35 for controlling the supply of the protein powder P may not necessarily be provided in order to simplify the equipment.

As described above, according to the first embodiment of the method of the present invention, in order to avoid the kneading step of the extruder 20 which is in a high temperature state, the protein powder P having poor heat resistance is subjected to thermal decomposition of the protein powder P. This is advantageous in that a high-tactile resin material for injection molding can be efficiently mass-produced.

Next, FIG. 3 shows a second embodiment of the method of the present invention. In this embodiment, as shown in FIG. 3, protein powder P is adhered to the outer surface of the resin pellet 51 at the time of compounding. After mixing the thermoplastic resin material 11 and an appropriate amount of the reinforcing filler 12 into the Henschel mixer 10, and after passing through a mixing step, supplying the extruder 20 to the rod-shaped resin material 24, the rod-shaped resin material 24 is extruded. Pelletize, mix the resin pellet 51 and the protein powder P into a tumbler 80, mix the protein powder P and the resin pellet 51 by a master batch method, and form a pellet-like resin having the protein powder P adhered to the outer surface. It is to produce materials.

Also in this embodiment, since the protein powder P is not thermally decomposed, a high-tactile injection molding material can be obtained, and the tactile feel can be adjusted by using a tumbler 80.
It can be easily performed by adjusting the amount of the protein powder P mixed into the inside.

[0028]

As described above, the resin material for injection molding according to the present invention has a structure in which protein powder is adhered to the outer surface of resin pellets. After the kneading step, the protein powder is adhered to the outer surface of the resin pellets, so that the protein powder does not thermally decompose in the high-temperature kneading step as in the prior art, and has a good feel to the touch. Has the effect that it can be molded.

[Brief description of the drawings]

FIG. 1 shows a first embodiment of the method of the present invention, and is a schematic view showing a first embodiment of a method of manufacturing a resin material for injection molding.

FIG. 2 is an explanatory view showing a step of attaching a protein powder in the method for producing the resin material for injection molding shown in FIG.

FIG. 3 is a schematic view showing a second embodiment of the method for producing a resin material for injection molding in the method of the present invention.

FIG. 4 is a schematic view showing a conventional method for producing a resin material for injection molding.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Henschel mixer 11 Thermoplastic resin 12 Reinforcing filler 20 Extruder 22 Quantitative feeder 23 Die 24 Resin material 30 Powder attaching machine 40 Cooling water tank 50 Pelletizer 60 Dryer 70 Stock box 80 Tumbler P Protein powder

Claims (3)

(57) [Claims] 1. An injection molding method wherein a resin powder prepared by mixing 50 to 0 parts by weight of a reinforcing filler with 50 to 100 parts by weight of a thermoplastic resin is made to adhere to an outer surface of a resin pellet. Resin material. 2. A method for producing a resin material for injection molding in which a protein powder is adhered to an outer surface of a resin pellet, wherein 50 to 100 parts by weight of a reinforcing resin is added to 50 to 100 parts by weight of a thermoplastic resin. A mixing step of mixing by mixing, a kneading step of kneading the material mixed in the mixing step by an extruder, and a rod-shaped resin material extruded from the extruder is passed through a protein powder adhering machine, thereby forming a resin. Manufacturing a resin material for injection molding, comprising: a protein powder adhering step of adhering the protein powder to an outer surface of the material; and a pelletizing step of pelletizing by a pelletizer after cooling in a cooling step, followed by drying. Method. 3. A mixing step of mixing and mixing 50 to 0 parts by weight of a reinforcing filler with 50 to 100 parts by weight of a thermoplastic resin, and a kneading step of kneading the mixed resin material with an extruder. After the extruded rod-shaped resin material is cooled, a pelletizing step of pelletizing with a pelletizer, and mixing and stirring the resin pellet and the protein powder in a tumbler, thereby attaching the protein powder to the outer surface of the resin pellet. A method for producing a resin material for injection molding, comprising: a step of attaching a protein powder to be made.