KR20160115157A

KR20160115157A - plastic resin including Al powder, plastic resin pellet, and producing method

Info

Publication number: KR20160115157A
Application number: KR1020150042283A
Authority: KR
Inventors: 정우석
Original assignee: 주식회사 우성케미칼
Priority date: 2015-03-26
Filing date: 2015-03-26
Publication date: 2016-10-06

Abstract

The present invention relates to a polyacetal resin, a polyacetal resin pellet, and a method for producing the same. The polyacetal resin comprises 96 to 99% by weight of a polyacetal resin, And 4 to 1% by weight of an aluminum metal powder. According to the present invention, since the aluminum metal powder is included in the present invention, it is possible to omit the coating process without any additional coating, And the resin can be recycled.

Description

TECHNICAL FIELD The present invention relates to a polyacetal resin, a polyacetal resin pellet including an aluminum powder,

The present invention relates to a polyacetal resin, a plastic resin material pellet, and a method of manufacturing the same, more particularly, to a polyacetal resin, an aluminum resin powder, A polyacetal resin pellet comprising an aluminum powder which is easy to be reused and a method for producing the same.

Conventional plastic resin is injected into an injection mold in a molten state and injection-molded, and then subjected to a separate coating process to be subjected to an injection process to be used as an automobile interior material, an interior and exterior material for electronic products, In particular, in the case of a housing serving as a reflector of a lamp or the like, aluminum is deposited on the outer surface for surface gloss and then coated.

However, defects may occur in the process of depositing and coating aluminum on the outer surface as described above. Further, since aluminum is deposited and the coated product is difficult to recycle, and since the product performs complicated achievements such as painting, deposition and coating, there is a problem.

In order to solve the above problems, JP-A-1432633 discloses a thermoplastic resin composition excellent in aluminum vapor deposition and adhesion. The resin composition disclosed in this patent document has improved vapor deposition property and adhesion property with aluminum, And that the deposited aluminum is not easily peeled off. However, this is also a fundamental problem in which the coating, deposition and coating operations must be performed after the resin product is manufactured.

Therefore, the inventors of the present invention have been required to develop a resinous product capable of having a proper gloss of a resin product and a manufacturing method thereof without separately depositing and coating aluminum.

KR 10-1432633 B1 KR 10-1414058 B1 KR 10-2014-0105814 A KR 10-1420288 B1 KR 10-2011-0087966 A

Disclosure of Invention Technical Problem [8] The present invention has been made to solve the problems of the prior art and to provide a resin composition which is excellent in productivity since injection molding of a plastic resin is not required after a separate coating process, And an object of the present invention is to provide a polyacetal resin, a plastic resin material pellet, and a method of manufacturing the same, which contain aluminum powder having an excellent appearance of an injection product.

The present invention for achieving the above object is achieved by a resin composition comprising 96 to 99% by weight of a polyacetal resin as a main component and 4 to 1% by weight of an aluminum metal powder as an additive.

In the present invention, the aluminum metal powder preferably has a particle size of 5 to 60 탆.

In the meantime, the present invention relates to a method for producing a polyacetal resin composition, which comprises mixing a mixture of 96 to 99% by weight of a polyacetal resin and 4 to 1% by weight of an aluminum metal powder, A feed hopper feeding step of feeding a mixture of polyacetal resin and aluminum powder produced in the mixing step into a feed hopper; An injection step of injecting the mixture supplied to the feed hopper into an extruder; An extrusion molding step of extruding the mixture into a sponge using an extrusion molding machine; A cooling step of cooling the spindle extruded in the extrusion molding step using a cooling device; A pellet manufacturing step of cutting the cooled sprocket through a cooling step to a predetermined length using a cutter to produce pellets; A storage hopper feeding step of feeding the pellet produced in the pellet production step to a storage hopper positioned at the top by using a spiral conveying device; And a packaging step of packaging the pellets supplied to the storage hopper in a certain amount.

In addition, the extrusion molding step of the present invention comprises an inlet through which the mixture is introduced; A pressurizing portion having a pressurizing screw for pressurizing the mixture injected into the interior through the inlet; And the extruder is located at one end of the pressurizing portion and extrudes the mixture pressed by the press screw into a bar shape.

In this case, it is more preferable that the pressing screw comprises a spiral-shaped transferring part and a plurality of cam-shaped pressing parts.

In the meantime, the cooling step of the present invention includes: a cooling body in which water is stored therein and an upper portion thereof is opened; It is preferable that the spindle is cooled by alternately passing water and air along the upper and lower rollers while being cooled by a cooling device including upper and lower rollers provided at regular intervals along the length of the cooling body.

In addition, the pellet manufacturing method of the present invention includes: a main body having a cutting knife for cutting a spindle to be supplied into the pellet at regular intervals; A sorting unit for sorting the pellets cut in the body by size; It is preferable that the pellet is manufactured by a cutter provided at the lower portion of the sorting portion and including the exciting portion having the sorting portion.

According to the present invention, there is a need to solve the problems of the prior art and to provide a plastic injection molding machine which is excellent in productivity since plastic resin is not required to undergo a separate coating process after injection molding, and recycling of resin is performed without separating or filtering harmful paint materials And a polyacetal resin and a polyacetal resin material pellet including an aluminum powder having an excellent appearance of an injection product are produced.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a flow chart showing a method for producing a polyacetal resin pellet containing aluminum powder according to the present invention,
Fig. 2 is a view showing an example of an apparatus for producing a polyacetal resin including the aluminum powder of the present invention,
3 is a view showing an example of the mixing agitator and the feeding hopper of the present invention,
4 is a view showing an example of the extrusion molding machine of the present invention,
5 is a view showing an example of an extrusion screw included in the extrusion molding machine of the present invention,
6 is a view showing an example in which the spur bar is manufactured in the extrusion molding machine of the present invention,
7 is a view showing an example in which the sunroof is cooled by the cooling device of the present invention,
8 is a view showing an example of a cutting machine of the present invention,
9 is a view showing an example of the sorting unit in the cutting machine of the present invention,
10 is a view showing an example of a transfer unit of the present invention,
11 is a view showing an example of the storage hopper of the present invention.

Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

The present invention provides a plastic injection molding machine which is excellent in productivity since plastic resin is injection-molded after being subjected to a separate coating process and can be recycled without separating or filtering harmful paint materials, The present invention relates to a polyacetal resin, a polyacetal resin pellet, and a process for producing the same, wherein the polyacetal resin and the polyacetal resin pellets each contain an aluminum powder containing 96 to 99% by weight of a polyacetal resin and 4 to 1% And the method for producing the resin composition will be described in more detail below.

a. In the mixing step S10,

In this step, the raw material is placed in a mixing agitator 10 and mixed and stirred. In the present invention, 96 to 99% by weight of the base material of the polyacetal resin and 4 to 1% by weight of the aluminum metal powder are mixed.

The polyacetal resin, which is the main component of the resin composition, is a milky white thermoplastic resin produced by polymerization (polymerization) of formaldehyde (CH 2 O) and trioxane (CH 2 O) 3. In 1958, US chemical company DuPont first commercialized There are two types of homopolymer and high polymer.

Such a polyacetal resin has high crystallinity, excellent mechanical properties such as bending strength, dimensional stability, endurance characteristics and abrasion resistance, so it has properties most similar to those of engineering plastics, And it is widely used in electric and electronic parts such as VTR and audio, mechanical parts such as various gears, bolts and nuts, automobile parts, construction materials, and piping parts. In recent years, automobile parts field, door locks, wipers, And the application range thereof is gradually increasing.

On the other hand, the aluminum metal powder, which is an additive of the resin composition, has a particle size of 5 to 60 탆. When the particle size of the aluminum metal powder is 60 탆 or more, the surface of the product to be molded is not uniform. When the particle size of the aluminum metal powder is 5 μm or less, it is difficult to produce the aluminum metal powder, which increases the manufacturing cost and is not suitable.

b. Feeding hopper supply step (S20)

1 to 3, the mixed mixture is fed to the feed hopper 20, which is then fed to the extruder 30, which will be described later, And an injection amount controller 21 for controlling the injection amount of the mixture so that the mixture can be injected.

c. In the injection step (S30)

In this step, a mixture temporarily stored in the hopper 20 is injected into the extrusion molding machine 30. At this time, a certain amount of the mixture is continuously supplied to the hopper 20 under the control of the injection amount controller 21, The extruder 30 produces a spindle L of a constant thickness.

d. In the extrusion molding step (S40)

In this step, the mixture to be injected from the input hopper 20 is injected through the injection step S30 into the lead rod L by using the extrusion molding machine 30. The extrusion molding machine 30 of the present invention for this purpose, And a pressurizing portion 32 having a pressurizing screw 32A for pressurizing the mixture injected into the hopper 20 through the inlet 31 and an inlet 31 for introducing the mixture from the inlet hopper 20 as shown in FIG. And an extruding part 33 which is located at one end of the pressing part 32 and extrudes the mixture pressed by the pressing screw 32A into a bar shape.

At this time, the pressure screw 32A is composed of a spiral conveying portion 32A 'and a plurality of cam-shaped pressing portions 32A' as shown in FIG. 5, and by the structure of the pressing screw 32A, Is conveyed to one side of the extrusion molding machine 30 along the conveying portion 32A 'and is repetitively pressed by the pressing portion 32A' 'to be structurally densely mixed so that the air contained in the mixture is removed while being extruded Pores and the like are not formed in the forward rod L.

When the mixture is introduced through the inlet 31 of the extrusion molding machine 30 as described above, the mixture is heated by a heater or a burner (not shown) installed therein to a temperature higher than a certain temperature, Is conveyed to the outlet of the extrusion molding machine 30 by the conveying portion 32A 'of the press screw 32A while the molten mixture is conveyed while uniformly mixing the main material and the additive through the plurality of pressing portions 32A " .

The molten mixture to be mixed and conveyed is extruded in the form of a spindle L through an extruding portion 33 on the outlet side and immediately cooled by a cooling device 40 to be described later, Is maintained without being deformed.

e. The cooling step (S50)

6 and 7, the cooling body 41, in which water is stored and the upper part thereof is opened, as shown in FIGS. 6 and 7, is used to cool the lead rod L to be extruded through the extrusion molding step S40. And the upper and lower rollers 42 and 43 provided at regular intervals along the length of the cooling body 41. The cooling device 40 includes a cooling device 40,

The spindle L extruded from the extruded portion 33 is rotated by the upper and lower rollers 42 and 43 of the cooling body 41 by alternately passing the water and the air through the cooling device 40, And is cooled more rapidly by the water cooling and air cooling method.

f. The pellet production step (S60)

In this step, the spindle L that has been cooled through the cooling step S50 is cut to a predetermined length by using the cutter 50 to form the pellet. A main body 51 provided with a cutting knife (not shown) for cutting the spindle L to be fed to the main body 51 at regular intervals, a collecting and feeding unit 52 for collecting and feeding the cut pellets in the main body 51, And an exciting part 53 provided at the lower part of the sorting part 52 for applying vibration to the sorting part 52. [

When the spindle L cooled by the cutter 50 having the above structure is supplied to the inside of the cutter 50 through the upper portion of the cutter 50, it is cut into a predetermined length by a cutting knife and is manufactured into a pellet shape. Is supplied to a collecting and conveying section 52 provided at one side and falls downward through a plurality of through holes 52A formed in the sorting section 52 by vibration generated in the exciting section 53 to be conveyed to a conveying device 60 .

g. In the storage hopper supply step (S70)

In this step, the pellet selected through the sorting unit 52 is supplied to the storage hopper 70 located at a relatively upper position. For this purpose, in the present invention, the spiral conveying apparatus 60 is used The pellet is transported upward along the spiral by the vibration of the conveying device 60, and is cooled to room temperature while being exposed to the air for a long time in this process.

The pellets transferred by the transfer device 60 are distributed and stored in a plurality of storage hoppers 70 as shown in FIG.

h. The packaging step (S80)

In this step, pellets supplied to the storage hopper 70 are packed in a bag or the like. To this end, the storage hopper 70 is provided with a controller (not shown) for automatically opening and closing the inlet so as to supply a predetermined amount of pellets.

The physical properties of the pellets produced through the process for producing the polyacetal resin pellets containing the aluminum powder according to the present invention and the conventional polyacetal resin pellets without the aluminum powder were measured, Table 1 shows the results.

Property Conventional polyacetal resin pellets A polyacetal resin re-pellet comprising 2.5 wt% of aluminum powder Melt flow 52.0 50.0 The tensile strength 615 650 Elongation 40.0 6.5 Flexural strength 917 960 Flexural modulus 26,500 27,000 Izod impact 5.34 5.60 density 1.410 1.530 Ash 3.7

As shown in Table 1, the physical properties of the existing polyacetal resin pellets and the polyacetal resin pellets comprising the aluminum powder according to the present invention show only a large difference in the elongation, Therefore, it can be confirmed that the present invention is applied to various products using existing polyacetal resin pellets.

That is, a polyacetal resin, a polyacetal resin pellet, and a method for producing the same, which comprises the aluminum powder of the present invention, are produced by mixing aluminum acetal resin and aluminum metal powder into a pellet form, The appearance is good without applying a coating for a glossy coating or the like separately on the appearance, and the appearance of the article is not painted, so that it is easier to recycle, and there is no great difference in the properties of the existing polyacetal resin pellets The product can be manufactured by using the product molding apparatus which is installed and used.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, &Lt; RTI ID = 0.0 > and / or < / RTI >

It is to be understood that the appended claims are intended to supplement the understanding of the invention and should not be construed as limiting the scope of the appended claims.

10: Mixing Stirrer 20: Feeding hopper
21: input amount controller 30: extrusion molding machine
31: input port 32:
32A: pressure screw 32A ': conveying part
32A ": pressing portion 33: extrusion portion
40: cooling device 50: cutting device
51: main body 52:
52A: through hole 53:
60: Feeding device 70: Storage hopper
L: Vanguard

Claims

In the plastic resin composition,
In the resin composition,
96 to 99% by weight of a matrix of polyacetal resin;
And 4 to 1% by weight of an aluminum metal powder as an additive.

The method according to claim 1,
Wherein the aluminum metal powder has a particle size of 5 to 60 占 퐉.

In the method for producing a plastic resin pellet,
Mixing step (S10) of mixing 96 to 99% by weight of the polyacetal resin and 4 to 1% by weight of the aluminum metal powder with each other in the mixing agitator 10;
A supplying hopper supplying step (S20) of supplying a mixture of the polyalast resin and aluminum powder prepared in the mixing step (S10) to the charging hopper (20);
An injection step (S30) of injecting the mixture supplied to the injection hopper (20) into the extrusion molding machine (30);
An extrusion molding step (S40) of extruding the mixture into the lead rod (L) using the extrusion molding machine (30);
A cooling step (S50) of cooling the spindle (L) to be extruded in the extrusion molding step (S40) by using a cooling device (40);
A pellet manufacturing step (S60) of cutting the precursor (L) cooled through the cooling step (S50) to a predetermined length by using a cutter (50) to make pellets;
A storage hopper supply step (S70) for supplying the pellet produced in the pellet production step (S60) to a storage hopper (70) located at the upper side by using a spiral transfer device (60);
And a packaging step (S80) of packing the pellets supplied to the storage hopper (70) in a certain amount. The method for producing a polyacetal resin pellet according to claim 1,

The method of claim 3,
Wherein the aluminum metal powder has a particle size of 5 to 60 占 퐉. The method of manufacturing a polyacetal resin pellet comprising aluminum powder.

The method according to claim 3 or 4,
The extrusion molding step (S40)
An inlet 31 into which the mixture is introduced;
A pressing portion 32 provided with a pressing screw 32A for pressing the mixture injected through the inlet 31;
The extruder (30) includes an extruding part (33) located at one end of the pressurizing part (32) and extruding the mixture pressed by the press screw (32A) into a bar shape. L). &Lt; RTI ID = 0.0 > 11. < / RTI >

The method of claim 5,
The pressing screw (32A)
A spiral-shaped transfer part 32A ';
And a pressing portion 32A "constituting a plurality of cam shapes,
The mixture supplied to the inside of the charging port 31 is transferred to the extruding part 33 of the extruder 30 by the transferring part 32A 'of the pressing screw 32A while the mixture is being conveyed Wherein the main material and the additive are pressurized and mixed uniformly while passing through the plurality of pressurizing portions 32A ". The method of manufacturing a polyacetal resin pellet according to claim 1,

The method according to claim 3 or 4,
The cooling step (S50)
A cooling body 41 in which water is stored and an upper portion is opened;
(40) comprising upper and lower rollers (42, 43) provided at regular intervals along the length of the cooling body (41)
The method of manufacturing a polyacetal resin pellet according to claim 1, wherein the sprocket (L) is cooled while alternately passing water and air alternately along the upper and lower rollers (42, 43).

The method according to claim 3 or 4,
The pellet manufacturing step (S60)
A main body 51 having a cutting knife for cutting the spindle L supplied to the inside thereof at regular intervals;
A collecting and feeding section (52) for collecting and transporting the cut pellets in the main body (51);
Wherein the pellet is made of pellets by the cutter (50) which is installed at the lower part of the collecting and conveying part (52) and includes the exciting part (53) having the collecting and conveying part (52) A method for producing a resin pellet.