JPH08302207A - Resin composition and synthetic resin molded part - Google Patents

Abstract

PURPOSE: To enable to recognize the recycle number of a resin composition at a glance. CONSTITUTION: In a process for recycling a molded product produced from a raw material comprising a resin composition synthesizing through a resin production process not containing a grinding process and containing microcapsules encapsuling a coloring agent, the molded product is first ground to decompose the microcapsules existing on the broken surfaces of the ground products to deposit the inner coloring agent. The coloring agent-deposited resin pellets are kneaded in the next kneading process to give the recycled resin homogeneously containing the coloring agent and having the color on appearance. Thus, the color degree of the resin depends on the number of the grinding processes, and the existence and number of the recycling processes can be recognized with the color.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a synthetic resin component which is frequently used in various equipment such as an image forming apparatus such as an electrophotographic copying machine, and in particular, a resin composition which is a raw material from the viewpoint of recycling thereof. It relates to synthetic resin molded parts that have taken the life management measures necessary for recycling molding.

[0002]

2. Description of the Related Art In recent years, from the viewpoint of environmental ecology and resource saving, in particular, synthetic resin moldings constituting internal parts of the image forming apparatus and the like have been actively used for recycling. Seed synthetic resin molded parts are being recycled from the market after they have been used for a while, after being recovered from the market, and then cleaned, crushed, kneaded, and molded.

By the way, even if resins having the same composition are used, the degree of change in resin characteristics such as deterioration of the material due to the number of times of recycling is different. Therefore, although it is possible to manufacture recycled molded products by using resins having different numbers of recycling times as mixed raw materials, in that case, there is a problem that remarkable variations in quality occur.

In order to solve such a problem, a method of clarifying the degree of material deterioration by recording the number of times a synthetic resin molded part has been used has been conventionally tried. For example, in Japanese Unexamined Patent Publication No. 6-143279, the number of times of recycling is displayed for each target synthetic resin molded component, and the same display component is selected and subjected to a recycling process. Since the reuse synthetic resin molded part obtained by this is a part whose number of recycles has been confirmed, a new number of recycles is displayed on this part.

In the above-mentioned prior art example having such a structure, it is possible to easily estimate the deterioration of the resin material used by recycling for effective use of resources, and improve the recyclability. There is an advantage.

[0006]

However, in the case of the above-mentioned prior art example, since the number of times of use must be displayed for each synthetic resin molded part, there is a problem that a great deal of labor and labor is required. In addition, since the display surface is limited to one or two surfaces of the parts and the display area is naturally limited, not only does it take a lot of time to select the same display parts from a large number of used parts. , It is difficult to avoid selection mistakes.

The present invention has been made in order to solve such a problem, and takes a means of separately displaying the number of times of recycling by adding a relatively simple device to the resin composition itself as a raw material. It is another object of the present invention to provide a resin composition which enables the degree of recycling to be recognized at a glance and a synthetic resin molded component without the problems of the above-mentioned prior art examples.

[0008]

In order to achieve the above object, the resin composition of the present invention is a resin composition synthesized through a resin manufacturing process which does not include a crushing process, and contains microcapsules containing a colorant. It is supposed to do.

Further, a synthetic resin molded part molded by using the resin composition having the above-mentioned constitution as a raw material is re-molded through a resin manufacturing process including a crushing process and a kneading process, and applied to a recyclable product, which is excellent selection. It will be effective.

[0010]

When a synthetic resin molded part using the resin composition having the above-mentioned composition as a raw material is crushed for recycling, the microcapsules present on the fracture surface are destroyed during the crushing, and the colorant inside is deposited. The resin pellet on which the colorant is deposited becomes a recycled resin that uniformly contains the colorant in the next kneading step, and has a tint in appearance. Therefore, since the degree of coloring gradually changes depending on the number of times the parts are crushed, that is, the number of times of recycling, it is possible to visually distinguish the presence or absence of recycling and the number of times of recycling.

[0011]

Embodiments of the present invention will be described below. The resin composition according to this example is used for a component that constitutes an internal mechanism of an electrophotographic copying machine, which is one of image forming apparatuses, for example, and a colorant is used in a general-purpose thermoplastic resin manufacturing process. It is characterized in that it contains an appropriate amount of the contained microcapsules.

That is, this resin composition can be produced by a resin production method which does not include a crushing step such as a suspension polymerization method. In the resin production process, an appropriate amount of microcapsules is contained in the resin, Alternatively, it is produced by kneading an appropriate amount of microcapsules in a resin in the process of molding a resin molded product. In any of the above production methods, the content of the microcapsules in the resin is determined by the hiding power of the colorant, but is usually about 1 to 10% by weight.

The microcapsules may be manufactured by any of well-known wet method, dry method, and other methods. Further, various kinds of colorants such as color dyes and pigments can be used.

As the basic resin of the resin composition of this embodiment, acrylic type, styrene type, polyester type and the like can be used, and among them, styrene-acrylic resin is particularly preferably used. When this styrene-acrylic resin is used as the basic resin, divinylbenzene is suitable as the crosslinking agent, and relative to 100 parts by weight of styrene-acrylic resin, divinylbenzene is about 0.5 parts by weight, and
About 5 to 10 parts by weight of the colorant is blended.

The microcapsules are composed of a core which is a coloring liquid and a shell which encloses the core, and those having a size of about 10 to 100 μm are preferably used. The shell is a single shell made of an organic polymer or a plurality of shells made of a combination of different types of organic polymers, and in the case of a shell made of a single shell, those formed by interfacial polycondensation are mentioned. In the case of a shell composed of a plurality of shells, a film composed of an interfacial polycondensation film and an organic polymer, in particular, a multilayer film composed of a combination of a radical polymerization film can be mentioned. . The organic polymer may be crosslinked with a crosslinking agent such as divinylbenzene to improve the thermal stability of the shell.

Further, the content of the coloring agent in the coloring liquid constituting the core is not particularly limited, and it is used in an appropriate amount depending on the hiding rate of the coloring agent and the like. Suitable examples of colorants are: Black pigments ... Carbon black, acetylene black, lamp black, aniline black. Yellow pigments: yellow lead, zinc yellow, cadmium yellow, yellow iron oxide, mineral fast yellow, nickel titanium yellow, navels yellow, naphthol yellow S, Hansa yellow G, benzidine yellow GR, quinoline yellow lake, permanent yellow NCC, tartrazine. rake. Orange pigments: reddish yellow lead, molybdenum orange, permanent orange GTR, pyrazolo orange,
Vulcan Orange, Indus Remble Luant Orange RK, Benzidine Orange G, Indus Remble Luant Orange GK. Red pigment: red iron oxide, cadmium red, red lead, mercury cadmium sulfide, permanent red 4R, resole red, pyrazolone red, watching red calcium salt, lake red D, brilliant carmine 6B, eosin lake, rhodamine lake B, alizarin lake, brilliant carmine. 3B.
Purple pigment: Manganese purple, fast violet B, methyl violet lake. Blue pigments: navy blue, cobalt blue, alkali blue lake, Victoria blue lake, phthalocyanine blue, metal-free phthalocyanine blue, phthalocyanine blue partially chlorinated, fast sky blue, indanthrene blue BC. Green pigments: chrome green, chrome oxide, pigment green B, malachite green lake, fanal yellow green G. White pigment: zinc white, titanium oxide, antimony white, zinc sulfide. Extender pigments: barite powder, barium carbonate, clay, silica, white carbon, talc, alumina white.

These colorants may be added in an amount contained in the resin, and are generally used in an amount of 1 to 30% by weight, particularly 3 to 20% by weight, based on the monomers.

Next, a recycling system for synthetic resin molded parts made of the resin composition having the above construction will be described with reference to FIGS.
Will be described with reference to. In the case where the synthetic resin molded part 1 made of the resin composition of this example synthesized without undergoing the crushing process is a virgin product, as shown in FIG. 1 (A), the microcapsules 3 are entirely contained in the resin 2. , Is dispersed and mixed without being crushed. Therefore, in this state, the appearance of the component 1 is unified with the tint of the colorant contained in the resin 2.

Next, after the virgin product is used and collected, it is recycled and reused. In this case, first, as shown in FIG.
In the crushing process, it is crushed by a known shredder or the like and processed into pellets. At the time of this crushing, among the microcapsules 3 contained in the resin 2, the microcapsules 3 existing so as to cross the resin surface broken by the crushing have the shell broken as shown in FIG. , The colorant inside is deposited.

As shown in FIG. 1C, in the pelletized resin, a certain amount of the microcapsules 3 have already been destroyed and the colorant has been deposited.
It is kneaded in the next kneading step shown in (D) to form a recycled resin that uniformly contains the colorant.

FIG. 3 shows an example of a continuous kneading extruder used in the kneading step. The continuous kneading extruder 5 has a feed hopper 6 at one end, an extrusion port 7 at the other end, and a kneading screw 8 inside. The supply hopper 6 is provided with a metering and feeder 9 for the crushed resin pellets 4. In this kneading step, when the resin pellets 4 are put into the supply hopper 6, the amount of the resin pellets 4 controlled by the metering feeder 9 is sent to the kneading screw 8.
The resin pellets 4 kneaded by the kneading screw 8 become recycled resin 10 and are discharged from the extrusion port 7.

The recycled resin 10 kneaded by the continuous kneading extruder 5 has the appearance of the coloring agent contained in the microcapsules 3, as shown in FIG. 1 (E). As the crushing process for recycling is repeated, the color of the colorant contained in the microcapsules 3 gradually becomes stronger as shown in FIG. Also, it is possible to color-code the number of times. Figure 4 (A) shows the virgin product, (B) shows 1
The second recycled product is shown in (C), and the second recycled product is shown in (C).

In order to facilitate the determination of the number of times of recycling, a color card in which the shade corresponding to the number of times of recycling is shown stepwise is prepared, and the color card and the resin pellet 4 are compared. The number of times of crushing, that is, the number of times of recycling may be determined.

[0024]

Industrial Applicability As described above, the resin composition of the present invention is one synthesized through a resin manufacturing process that does not include a crushing step, and since it contains microcapsules containing a colorant, At the time of the crushing, the microcapsules existing on the fracture surface are destroyed and the colorant inside is deposited. The resin pellets on which this colorant is deposited are
In the next kneading step, the recycled resin uniformly contains the colorant, and it becomes tinted in appearance. Therefore, since the degree of coloring gradually changes depending on the number of times the parts are crushed, that is, the number of times of recycling, it is possible to visually distinguish the presence or absence of recycling and the number of times of recycling.

Further, the synthetic resin molded part of the present invention is molded by using the resin composition having the above-mentioned constitution as a raw material and can be re-molded through a resin manufacturing process including a crushing process and a kneading process. It is possible to judge a recycled product by an extremely simple method of distinguishing the appearance color, and it is also possible to judge the number of times the product is recycled by the appearance color.

As described above, according to the present invention, it is possible to produce a molded product having the same strength and characteristics with stable quality by performing the recycling molding using the resin of the same color. It has no excellent effect.

[Brief description of drawings]

FIG. 1 is a diagram schematically showing a recycling system for synthetic resin molded parts according to an embodiment of the present invention.

FIG. 2 is a view schematically showing a state in which the microcapsules are broken in the crushing process.

FIG. 3 is a diagram showing an example of a continuous kneading extruder used in a kneading step.

FIG. 4 is a diagram schematically showing a difference in color tone between a virgin product and a recycled product.

[Explanation of symbols]

 1 Synthetic Resin Molded Parts 2 Resin 3 Micro Capsule 4 Resin Pellet 5 Continuous Kneading Extruder 10 Recycled Resin

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Mamoru Fujimoto 1-2-2 Tamatsukuri, Chuo-ku, Osaka Mita Engineering Co., Ltd. (72) Inori Masanori Doi 1-2-2 Tamatsukuri, Chuo-ku, Osaka Within Mita Engineering Co., Ltd.

Claims (2)

[Claims] 1. A resin composition synthesized through a resin production process which does not include a crushing process, which contains microcapsules containing a colorant. 2. A synthetic resin molded component which is molded using the resin composition according to claim 1 as a raw material and is remoldable through a resin manufacturing process including a crushing process and a kneading process.