JP2001002838A - Nonstatic or conductive foaming member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To intend effective use of wastes as well as to give an antistatic function by mixing a powder of a plant itself or a modified material thereof as a main component, a polyolefinic resin and/or a biodegradable resin and conductive powder and foaming. SOLUTION: A composition is composed of: a powder (A) of a plant itself such as coffee lees, beer lees, bran, bean-curd refuse, rice bran, old paper and a waste material or its modified material as a main component; a biodegradable resin (B) such as a polyolefinic resin and/or natural polymer, a microorganism- produced polyester or an aliphatic polyester; and conductive powder (C), mixing them in a ratio of 10-40 pts.wt. of the component (C) to 100 pts.wt. of the components (A+B) and not less than 20 pts.wt. of the component (B) to 100 pts.wt. of all compositions. A nonstatic or conductive foaming sheet, a foaming member or the like is molded by kneading the mixture, heat melting followed by water-foaming. The molded member can be utilize as a mounting member, a buffering material, a packing material and the like for semiconductive products.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a non-chargeable or conductive foam member which not only effectively prevents pollution and destruction of the natural environment, but also has good quality as a product.

[0002]

2. Description of the Related Art Conventionally, "okara" produced during the production of tofu, soybean hulls (defatted soybean protein) by-produced during the production of soybean oil, and solids (waste) obtained when refining wheat are used. Certain `` bran '' and coffee residue, beer residue, soy sauce pulp, and food residue such as rice bran discharged when manufacturing canned coffee are partially used for food and fertilizer. However, most were discarded without being used.

[0003] Also, waste paper discarded from homes and offices is usually recycled for paper recycling, but if the supply exceeds the demand in the recycling market, the price of paper drops and the recycling does not function well. . For this reason, there is a demand for a method of recycling various kinds of used paper other than the recycling of paper. Waste materials generated when rebuilding houses were incinerated or discarded as garbage.

[0004] On the other hand, a variety of synthetic resin molded products have been used in the past, but these synthetic resin molded products are not biodegradable, and remain semi-permanently even when buried in soil. It emits black smoke and generates harmful gas.

Therefore, for example, by molding a mixture of the synthetic resin and the above-described food residue, the food residue to be discarded is reused, and at the same time, the amount of the synthetic resin used is reduced to form the resin. 2. Description of the Related Art Molded articles capable of reducing harmful gas generated from articles to below an allowable value and decomposing food residue when discarded, thereby reducing a semi-permanently remaining portion thereof have been developed and used. Conventionally, among the molded products, a molded product obtained by foaming the molded product has been used as a cushioning material for packing various products.

[0006] However, the above-mentioned conventional molded article has no (or little) conductivity due to its material, so that it may be charged, which may cause inconvenience such as generation of static electricity in handling. In particular, it cannot be used as a cushioning material for products (for example, semiconductors) that dislike static electricity, and the use of molded members for preventing pollution of the natural environment is closed, which is inconvenient.

[0007]

SUMMARY OF THE INVENTION The present invention has been made in view of the above points, and has as its object to not only provide an antistatic function to increase the added value thereof, but also to reduce waste. It is an object of the present invention to provide a non-chargeable or conductive foamed member that can contribute to effective use of natural materials and conservation of the natural environment.

[0008]

In order to solve the above-mentioned problems, the non-chargeable or conductive foamed member according to the present invention comprises a powder mainly composed of a plant itself or a processed material thereof, and a polyolefin resin and / or a powder. It is characterized in that a mixture of a biodegradable resin and a conductive powder at a predetermined mixing ratio is foamed. Further, the polyolefin resin is polypropylene or polyethylene. Further, the conductive powder is a graphite or carbon black powder.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a flow chart of a manufacturing process of a non-chargeable or conductive foamed member according to the present invention. FIG. 2 is a schematic configuration diagram showing an apparatus for producing a non-chargeable or conductive foam member according to the present invention.

As shown in FIG. 1, in order to produce a non-charged or conductive foamed member according to the present invention, first, a powder 1 of a plant itself or a processed material thereof, a conductive powder 2, a polyolefin resin and And / or a biodegradable powder 3 is prepared (Step 1), and they are mixed and stirred (Step 2). Then, the mixed mixture is kneaded and heated and melted (Step 3), and water-foamed (Step 4). ) By doing so. Hereinafter, each step will be described.

[Step 1] Here, as the plant itself or its processed material, for example, plant residue such as coffee grounds or beer lees or bran or soybean hull or soybean or soy sauce or rice bran, paper or paper Bamboo or wood or a powder obtained by mixing any of them is used.

[0012] In the case of plant residue, it can be used as it is because it has been pulverized in the form of powder in the food processing step, but it may be further pulverized depending on the case. As the paper, used paper such as newspaper or magazine is used, and as wood, waste wood is used, but other paper or wood may be used.

Next, as the conductive powder 2, carbon,
Particularly in this embodiment, graphite powder is used. This powder 2
Is preferably smaller than the particle size of the powder 1.
This is because the powder 2 is heavier than the powder 1 and cannot be mixed well when the two are mixed unless the particle size is reduced accordingly.

Next, for example, a polypropylene resin is used as the polyolefin resin in the powder 3 of the polyolefin resin and / or the biodegradable resin, but other polyolefin resins (for example, high density polyethylene, low density polyethylene, polybutene, etc.) are used. ) May be used. The biodegradable resin is a polymer that can be decomposed by the metabolic action of microorganisms or other organisms, and includes, for example, a natural polymer, a microorganism-produced polyester, an aliphatic polyester, polylactic acid, and the like, or a mixture thereof.

The mixing ratio of each of the powders 1, 2, 3 is based on 100 parts by weight of the plant 1 or its processed material powder 1 and the polyolefin resin and / or biodegradable resin powder 3 in total. It is preferable that the amount of the conductive powder 2 be 10 to 40 parts by weight. Of course, depending on the materials to be blended, they may be mixed at other ratios.

Here, the polyolefin resin is a petroleum product, and the biodegradable resin is expensive. Therefore, the powder 1 and the powder 2 are better as the powder 3 is larger as compared with the powder 3, but it is difficult to maintain the strength of the molded article unless the powder 3 serving as an adhesive in forming the molded article is about 20 parts by weight or more. . If the amount of the conductive powder 2 is too small, the effect of conductivity is not sufficient, and if it is too large, the physical properties of the foam are deteriorated, and a good-quality foam cannot be obtained.

[Step 2] Next, the above powders 1, 2, 3
Are mixed and stirred, and in that case, a molding material manufacturing apparatus shown in FIG. 2 is used.

That is, first, the powder 1 of the plant itself or its processed material
Then, the conductive powder 2 and the powder 3 of the polyolefin resin and / or the biodegradable resin are put into a stirring mixer 20 and stirred and mixed by a stirring member 21.

[Step 3] Next, the mixture mixed by the stirring mixer 20 is introduced into the heating extruder 30, and the mixture is kneaded by rotating the screw 35 provided with the spiral ridge 33 in the cylinder 31. It is heated and melted by the heater 37 and extruded into the nozzle mechanism 40.

[Step 4] The nozzle mechanism 40 is spiral and has a plurality of melt passage holes 41 whose inner diameter becomes smaller toward the front, and a nozzle 43 having a substantially ring-shaped gap provided at the tip thereof. It is comprised including.

Therefore, the melt passage hole 41 of the nozzle mechanism 40
The melt pressed into the inside is spirally rotated and further pressurized while being kneaded, and is discharged from the nozzle 43 into a cylindrical shape. At that time, since the pressure is reduced, the water-containing plant itself or the powder 1 of the processed material functions as a nucleating agent for the foam, and forms a porous foam sheet A by forming porosity. When it is desired to adjust the expansion ratio, a predetermined amount of water is added to the heating extruder 30 separately. Then, by cutting the substantially cylindrical foam sheet (foam member) A, a flat foam sheet 50 (see FIG. 3) is obtained.

FIG. 3 is a schematic perspective view showing the manufactured foam sheet (foam member) 50. This foam sheet 5
0 has sufficient strength and cushioning property, and furthermore, has air permeability, and is excellent in hygroscopicity, adsorptivity, and breathability. Further, in the case of the present invention, since the conductive powder 2 is mixed, the conductive powder 2 is conductive and does not become charged even if the foamed sheets 50 rub against each other.

By the way, in order to secure the fluidity of the melt when the powder 1 of the plant itself or its processed material and the powder 3 of the polyolefin resin and / or the biodegradable resin are mixed and heated and melted, Calcium powder may be mixed. However, in the case of the present invention, the conductive powder 2 exerts the action of the calcium carbonate. Therefore, calcium carbonate used to secure the fluidity of the melt can be omitted, and the amount of materials to be mixed is reduced accordingly, so that the mixing of each material can be prevented from being complicated, and the cost can be reduced.

The foam sheet 50 may be cut into a rectangular shape, for example, and used as a semiconductor mounting sheet on which various so-called centipede-type semiconductors are mounted. Since the foam sheet 50 is non-chargeable, it can also be used for mounting and packaging semiconductors that are susceptible to static electricity. Of course, it may be used for mounting and buffering other various products, and may be used for other purposes.

In the above-described embodiment, the foamed sheet 50 having the shape as shown in FIG. 3 is manufactured. However, by changing the structure of the nozzle mechanism 40, for example, a granular (rod-shaped) foamed member 55 as shown in FIG. May be molded. The foamed member 55 is suitable for use in packing various products (it can be used for other purposes, of course). It goes without saying that the foamed member may be configured in various shapes and structures other than those described above, and may be used for various other purposes.

In the above embodiment, graphite is used as the conductive powder 2. However, in some cases, carbon black,
Other carbon materials such as carbon fiber may be used. Further, various conductive materials other than carbon may be used.

[0027]

As described in detail above, the present invention has the following excellent effects. The molded member itself can have an antistatic function,
Inconveniences such as generation of static electricity can be prevented, and the added value can be increased. Therefore, it can be used as a mounting member, cushioning material, packing material, etc. for various products that dislike static electricity, such as semiconductors and products using the same, and in the manufacturing process, transport process, and storage process of these semiconductors and products. Thus, the present molded member can be effectively used. Therefore, effective use of waste can be achieved.

When this molded member is discarded, the powder of the plant itself or the processed material thereof is decomposed by microorganisms and the like, and is compatible with the soil. If a biodegradable resin is used as the resin, this is also decomposed by microorganisms. After all, only the polyolefin resin and the conductive powder remain, but the amount of the polyolefin resin is small, and since the conductive powder enters between the polyolefin resins, natural physicochemical effects such as wind and rain, sunlight, etc. As a result, the polyolefin-based resin is eventually dispersed into small particles like soil. Further, even if the incinerator is incinerated, the calorific value is low and the incinerator is hardly damaged due to a low synthetic resin component, and no black soot or harmful gas is generated during incineration, thereby preventing pollution of the natural environment.

[Brief description of the drawings]

FIG. 1 is a flow chart of a manufacturing process of a non-chargeable or conductive foamed member according to the present invention.

FIG. 2 is a schematic configuration diagram showing an apparatus for manufacturing a non-chargeable or conductive foam member according to the present invention.

FIG. 3 is a schematic perspective view showing a manufactured foam sheet (non-chargeable or conductive foam member) 50.

FIG. 4 shows another foam member (non-chargeable or conductive foam member).
55 is a schematic perspective view showing 55. FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Powder which has plant itself or its processed material as a main component 2 Conductive powder 3 Powder of polyolefin resin and / or biodegradable resin 20 Stirring mixer 30 Heating extruder 40 Nozzle mechanism A Foam sheet (non-static or Conductive foam member 50 Foam sheet (non-chargeable or conductive foam member) 55 Foam member (non-chargeable or conductive foam member)

Claims (3)

[Claims] What is claimed is: 1. A mixture obtained by mixing a powder containing a plant itself or a processed material thereof as a main component, a polyolefin resin and / or a biodegradable resin, and a conductive powder in a predetermined mixing ratio, and foaming the mixture. Non-chargeable or conductive foam member. 2. The method according to claim 1, wherein the polyolefin resin is polypropylene or polyethylene.
A non-chargeable or conductive foam member according to the above. 3. The conductive powder according to claim 1, wherein the conductive powder is a graphite or carbon black powder.
A non-chargeable or conductive foam member according to the above.