JP2001047499A - Blow-molded product made by using multilayer resin molding waste material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simply and inexpensively manufacture a molding having a light weight, high rigidity and long lifetime by recycling a waste material of a multilayer resin blow-molded product containing a highly molecular weight high-density polyethylene and polyamide, and blow molding a thermoplastic resin having a specified ratio of the recycled resin and a specified weight ratio of respective components. SOLUTION: A waste material of a multilayer resin blown molding containing a highly molecular weight high-density polyethylene(HMHDPE) and polyamide(PA) is recycled. A thermoplastic resin containing 70 wt.% of the recycle resin and setting to 3 to 10% of weight ratio of the PA component to the HMHDPE component is blow method, thereby manufacturing a blow-molded product for a fuel tank or the like of an automobile. For example, a float of a culturing raft having a curved surface closed by a groove and a semi-sphere at both ends of a cylindrical part is blow-molded. According to this, the blown molding can be weight-lightened, and lifetime-prolonged. Further, its rigidity and operability can be improved. Its cost can be reduced, and an environmental disruption in association with a damage can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a molded article utilizing a waste material of a multilayer resin blow molded article such as a fuel tank for an automobile. More particularly, the present invention relates to a molded product for float of a culture raft such as oysters and scallops, and a method of using the molded product.

[0002]

2. Description of the Related Art As a method for molding a hollow container made of resin, blow molding (blow molding), that is, a plasticized plastic (referred to as a parison) formed into a hollow tube (pipe shape) formed by extrusion molding is used. There is known a molding method in which a pressurized gas is blown into the parison after forming the mold in a cavity of a mold to perform molding.

[0003] In recent years, resin fuel tanks and the like formed by blow molding have also been proposed and put into practical use as fuel tanks for vehicles. As the material, from the viewpoints of moldability, strength, cost, etc., a high-density polyethylene resin (HM
HDPE) is generally known. However, since polyethylene has an affinity for gasoline and the like, if the gasoline and the like are stored in a container such as a fuel tank made of a high-density polyethylene resin for a long period of time, the gasoline and the like gradually increase. There is a problem that it penetrates and penetrates the peripheral wall of the container.

For this reason, for example, Japanese Patent Publication No. 58-23212
And JP-A-62-138227, a resin layer formed of a high-density polyethylene resin and a resin layer formed of a polyamide resin or the like capable of preventing gasoline and the like from permeating. Are blow-molded using a multilayer parison formed by sandwiching high-density polyethylene resin layers on both sides so as to form a multilayer hollow molded container (fuel tank).

As described above, when blow molding is performed using a multilayer parison in which a plurality of resin layers are laminated, a plurality of waste resin such as burrs formed together with a molded product by the blow molding are also formed. Therefore, if this waste material resin is inadvertently reused as a recycled material resin, the following inconvenience will occur.

That is, since each resin layer constituting the multi-layer parison is provided to obtain predetermined characteristics, when a waste resin is mixed into a specific resin layer, the resin layer has Characteristics to be reduced. For example, in the above-described example, when waste material resin is mixed in the high-density polyethylene resin layer, the polyamide resin or the like in the waste material resin comes out on the outer surface or the inner surface of the fuel tank. It is conceivable that the fuel tank is degraded by (calcium) or alcohol-containing gasoline.

In order to solve such a problem, Japanese Patent Application Laid-Open No. 2-227210 discloses two adhesives which have an adhesive property to each other.
There is disclosed a method of forming a multilayer parison in which two resin layers are formed from different kinds of resins, and a waste resin layer is formed between these resin layers. Also, JP-A-4-3418
No. 05 discloses a method for producing a molded article characterized by limiting the weight ratio of waste resin to 50% or less, more preferably 30% or less, and then subjecting the mixture to high-density polyethylene for molding. Have been.

On the other hand, what is generally called a float is
Many have been known since ancient times. Among them, relatively large floats made of thermoplastic synthetic resins include the following.

The fishing net floats are used to set fishing nets offshore, and are attached to the upper end of the fishing nets in large numbers. These float around the water surface to prevent the fishing nets from sinking. The size is 30-100
In many cases, the shape is approximately spherical, and the shape is substantially spherical, and a hollow body structure is formed by blow molding using HMHDPE as a raw material. This type of float has 2 parts made by injection molding.
Some hemispherical molded articles are welded.

[0010] The float for paddy field agricultural equipment is a float for keeping agricultural equipment used for rice planting or the like so as not to sink in paddy fields or marshes. Although the size is various, the shape is often a sled shape or a substantially cylindrical shape and has a hollow body structure formed by blow molding using HMHDPE as a raw material.

[0011] Shellfish such as oysters and scallops are cultivated by hanging a large number of shells through a raft from the raft or hanging a basket containing scallops in a net basket from the raft into the sea. Done. This float is for keeping such a raft above the sea surface. Although they vary in size, they are mostly cylindrical and made of expanded polystyrene. This float made of expanded polystyrene is not a hollow body structure but a whole lump. Also, the oyster culture raft float is made by injection molding using a polyolefin resin as the raw material, and then welding them together, each having a substantially cylindrical side portion and approximately hemispherical portions at both ends. Some are.

Since the purpose of the float is to partially sink below the surface of the water to generate large buoyancy, the float must be originally hollow or have a very light material (having a specific gravity significantly less than 1). Must. Expanded polystyrene belongs to the latter. However, as can be seen from expanded polystyrene, which is generally used for packing electrical appliances, the higher the expansion ratio, the more brittle,
It breaks easily. Expanded polystyrene, which is the material of the float, is not so brittle, but its basic properties are the same, and when it is assembled on a raft for a long time and rubbed in the waves, it gradually breaks down and breaks from around I will. This reduces the buoyancy of the float and necessitates the addition of a float to the culture raft as needed. Moreover, since the rope for fixing the float to the raft gradually penetrates into the float, it is necessary to retighten the rope at any time, which makes the cultivation work complicated. Furthermore, the fine powder generated when the expanded polystyrene is broken is scattered around, which may cause a problem of environmental pollution. Also, foamed polystyrene floats have the disadvantage that the product life itself is much shorter than others.

[0013] A blown cylindrical float has been tried for oyster culture rafts. As for the float made from high-molecular-weight high-density polyethylene (HMHDPE), this resin has good blow moldability, quite high tensile strength, good weather resistance, is not weak against salt water, and is relatively inexpensive. For some reason, it is often used as a material for such floats. However, the HMHDPE resin has the disadvantage that the surface smoothness of the molded article is poor, and in addition, the abrasion resistance and the self-lubricating property are poor. Due to this drawback, in the case of a fishing net float, while it was rubbed between the waves for a long time, there was a problem that it was rubbed and cut between the waves and the net and thinned and finally collapsed .

In the injection molding method, it is impossible in principle to simultaneously produce a hollow body structure integrally.
Therefore, it must be manufactured in at least two parts as described above, and these must be welded later. This leads to a significant increase in cost. That is, there is a drawback that the production of the hollow body structure by the injection molding method is essentially higher in cost than the production by the blow molding method. In addition, since the strength of the adhesive part is lower than that of the integral molding, it is necessary to have an extra thickness to secure the strength, the whole float becomes heavy, the workability of attaching to the raft is bad, and the buoyancy is also heavy There is a drawback that it becomes smaller by the increase.

In general, the resins constituting each layer of the multilayer parison are often combinations having considerably different physical properties. This is inevitable because there is a demand for a molded article to have multiple layers in order to have a plurality of different physical characteristics. As a result of this disaster, it is technically very difficult to recycle the waste material of such multi-layer parison molded articles. In other words, the physical properties of the regenerated resin become so-called tangy, and eventually become unusable as a substitute for either of the original resins. Therefore, such a recycled resin is usually treated as a two-bundle three-piece as the lowest grade resin. (It is still better if you can distribute even two bundles and three sentences.)

In order to avoid such a problem, it is necessary to separate and recycle waste products of a multi-layer product into respective layers in advance. However, this is almost impossible with the current technology itself. At present it is not very economical.

The technique disclosed in Japanese Patent Application Laid-Open No. Hei 2-227210 shows one of the solutions to such a problem. However, the recycled resin of the multilayer parison waste material is put into the intermediate layer of the multilayer parison only. In order to produce a single product with high added value using recycled resin alone, the product is intended to be used in such a way that it is not exposed to the public as a result and the effect on the final product properties is minimized. It does not do. The technique disclosed in Japanese Patent Application Laid-Open No. 4-341805 also shows one of the methods for recycling waste material resin, which is mainly composed of unused high-density polyethylene, The resin is added and mixed as a so-called extender, and is not intended to be actively used mainly with waste resin itself.
Cylindrical floats made by blow molding are easy and inexpensive to mold and do not have the problem of crumbled during use as floats made of expanded polystyrene.
However, because the shape is only cylindrical, the culture raft shakes greatly, such as when a typhoon approaches, and the float sinks into the sea. However, there is a serious problem that the toner may be lost, and the product cannot be used.

[0018]

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a molded article produced by blow molding a regenerated resin of a multi-layer parison waste material alone and its use. A second object of the present invention is to provide a float made by blow molding that is lightweight, has good workability, has high rigidity, has a long life, is low in cost, and has no environmental damage due to breakage.

[0019]

Means for Solving the Problems The present inventors have made intensive efforts to solve the above-mentioned problems, and as a result, completed the present invention.

That is, the present invention relates to (1) a high-molecular-weight high-density polyethylene (HMHDPE) and a polyamide (P
A) is obtained by blow molding a thermoplastic resin containing 70% by weight or more of a raw material obtained by reclaiming waste material of a multilayer resin blow-molded article containing A) and having a PA component weight ratio of 3 to 10% to HMHDPE component. A blow-molded product characterized by being performed.

(2) The blow-molded article according to claim 1, which is used as a float for a culture raft.

In general, high-density high-molecular-weight polyethylene resin which is relatively inexpensive, has strength and does not have a polar group is often used as a main resin of the multilayer parison waste material. In many cases, a resin having different physical properties is used. Therefore HMH
A resin that is polar and is not a hydrocarbon resin is often blended with DPE. Consider a polyamide resin as a representative of such resins.

Disadvantages of HMHDPE resin are that the molded article has poor surface smoothness and poor abrasion resistance and self-lubricating property. On the other hand, polyamide resin is expensive, but has good surface smoothness, high surface hardness, and is excellent in wear resistance and self-lubricating property, and also has high heat resistance. Therefore HMHD
PE and polyamide resin have a complementary relationship with each other.

The waste material of a multilayer blow molded product produced as a fuel tank for automobiles and containing a polyamide resin as one layer is obtained by adding 3-1 to polyamide resin to this HMHDPE.
The composition contains about 0% by weight.

Polyamide resins are generally known to be hydrolyzable, but not so much when formed into molded articles. Conversely, most of the material of the fishing net itself is made of polyamide resin fibers (commonly known as nylon). As can be seen from the fact that it is a fiber, it is a strong resin against salt water.

Therefore, the waste material of a multilayer blow-molded product of an automobile fuel tank containing a polyamide resin as one layer is H
The disadvantages of MHDPE are poor surface smoothness, abrasion resistance,
This is a molding material in which a polyamide resin has a disadvantage of poor self-lubricating property and is compensated for by a polyamide resin having good surface smoothness and excellent wear resistance and self-lubricating property.

The molded article blow-molded with this molding material may be used as a raft for aquaculture such as oysters and scallops. The float produced with this molded product has poor surface smoothness when using only HMHDPE resin,
The low wear resistance and low self-lubricating property were compensated for, and the problem of the conventional float, which was rubbed, scraped, thinned and crushed, was solved. In addition, there is no problem that the polyamide resin is weakened against salt water due to contamination.

The price of polyamide resin is generally HMHD
More expensive than PE resin. Therefore, no matter how excellent the performance of the resin, it is costly to produce a float using only a polyamide resin, which is not economically suitable. Also H
It is impossible to increase the ratio of the polyamide resin mixed into the MHDPE resin unnecessarily for the same reason. The mixing ratio of the polyamide resin according to the present invention of 3 to 10% satisfies the technical requirement of improving the surface smoothness of the float and improving the wear resistance and the self-lubricating property to eliminate the problems which have conventionally occurred. In addition, it is the optimum ratio range that can simultaneously solve the conflicting problem of satisfying the economical requirement that production can be performed with little increase in product price.

[0029] Multilayer blow molded products produced as fuel tanks for automobiles generally have three types and five layers, and the resin used is an outer layer and an inner layer of high molecular weight high density polyethylene resin (HMHDPE). On the other hand, about 5% by weight of the polyamide resin (PA) is present in the middle layer as a gasoline barrier layer, and the total weight ratio between the outer layer and the middle layer and between the inner layer and the middle layer is about 2-3%. % Of an adhesive resin layer is added.

Therefore, the waste material of the fuel tank for an automobile is exactly the same as the raw material resin for a float aimed at by the present invention. Since the amount of the adhesive resin mixed in a small amount is small, it does not affect the physical properties of the float as a molded product. That is, in the present invention, by using the recycled resin as the waste material of the fuel tank for an automobile as it is, it was possible to produce a float with no inferior physical properties at an extremely low price. However, as long as the recycled resin as waste material is used in an amount of 70% by weight or more, a new resin or an additive which is not a recycled resin may be added. (See FIG. 14 when less than 70% by weight is used and the remainder is talc or talc + polypropylene.)

The shape of the present invention will be described below with reference to FIG. Since both ends of a cylindrical float are greatly deformed by water pressure received when submerged in water, the shape of both ends is a curved surface including a spherical surface in order to minimize this deformation. When the radius of the spherical surface is the same as the radius of the cylinder, the deformation due to water pressure is the smallest, but the radius of the spherical surface is set to be equal to or larger than the radius of the cylinder because of the workability of the float and the design.

When the radius of the spherical surface is larger than the radius of the cylinder by three times or more, the roundness of the spherical surface becomes smaller and becomes extremely weak against the pressure. As shown in FIG. Both ends are greatly deformed by water pressure as in the case of the float composed of only the float. Therefore, by setting the radius R of the spherical surface to r ≦ R ≦ 3r using the radius r of the cylinder, deformation can be suppressed.

When the radius of the spherical surface is larger than the radius of the cylinder, a corner is formed at the joint between the spherical surface and the cylindrical portion of the float, and when formed into such a shape by the blow molding method, the corner portion becomes thin. Because of the possibility, it is desirable that a curved portion (other than the cylindrical portion) including the spherical surfaces at both ends and the cylindrical portion of the body be smoothly connected. Therefore, the spherical surface is a part of the curved surface at both ends, but as shown in FIG. 3, the size of the spherical surface is sufficient to suppress deformation due to water pressure if the area is 50% or more of the area of the curved surface portion (other than the cylindrical portion). It is.

When attaching a float to a culture raft, the float is often fixed by contacting the float in parallel with a pillar constituting the raft. When the float sinks in the water in this state, the float receives a force from a column parallel to the float in contact with the float against the buoyancy generated in the float. At this time, the portion near the both ends of the body of the float undergoes the largest deformation. In the present invention, in order to reduce the deformation,
A groove structure along the circumference is provided in a portion near both ends of the body where deformation is greatest. As shown in FIG. 4 and FIG.
By setting the average thickness of the float to t, t ≦ d ≦ 10t, and the width w of the groove to w ≦ 3d, deformation of the float due to the load from the raft can be minimized.

Further, if the position of the groove is too far from the boundary between the cylinder and the curved surface including the spherical surface, the effect will be reduced. It has been clarified from the experimental results in FIG. 6 that the effective groove reinforcing effect is maintained by setting the range of ≦ L ≦ r / 5.

The number of grooves may be one or more as shown in FIG. 7 if the above condition is satisfied. Note that a rib having the same depth d and a thickness of 2t can be used instead of the groove. Further, grooves or ribs may be provided in addition to the above-mentioned range for the purpose of design or a purpose of hanging a rope.

The reference data in FIGS. 2 to 7 indicate that R of the spherical surface is
1.25r, the area of the spherical surface is 80% of the closed curved surface (other than the cylindrical portion) on both sides, and the thickness t = 5 for the groove.
mm, the groove depth d = 3t, the groove width w = 2.7d, the distance L = 0r from the boundary between the curved surface and the cylinder to the center of the groove, and the respective conditions were changed.

[0038]

[Function] In the existing floats, there are floats that satisfy all the conditions of light weight, high rigidity, long life, and low cost, whether they are foam molded products, injection molded products, or blow molded products. Did not. In the present invention, the recycled resin of the waste material of the fuel tank for an automobile is used as it is, and both ends of the cylindrical shape include a spherical surface having a radius of 1 to 3 times the radius of the cylinder and 50% or more of the area of the portion other than the cylindrical portion. Due to the closed shape of the curved surface, it was prevented from being greatly deformed or broken by water pressure. In addition to this, the circumference of the cylindrical part whose depth is 1 to 10 times the wall thickness and whose width is 3 times or less the depth is within 1/5 of the radius of the cylinder from the joint with the curved surface at both ends. By providing one or more grooves along both ends of the cylindrical portion, rigidity against the load and buoyancy of the raft was improved, so that the raft was not largely deformed or broken. Floats with these structures were made by blow molding.

As a result, the rigidity can be greatly improved, and in addition to the integral molding, the thickness for high rigidity can be reduced due to the above structure, the weight can be reduced, the cost can be reduced, and the workability can be improved. Excellent. In addition, as for the life, since the deformation is reduced, the stress is dispersed and bridged, and the life is extended.
In addition, it is environmentally clean without generating debris like a foam molded product. In addition to this, the adhesion of shells and the like is smaller than that of the foamed molded product having fine irregularities of the fine foamed product, and the shelling work is also reduced.

[0040]

Embodiments of the present invention will be described below. (Embodiment 1) FIG. 8 shows an embodiment of a float formed by blow molding having a groove and a curved surface closed by a hemisphere according to the present invention at both ends of a cylindrical portion. At this time, R of the spherical surface was 1.25r, and the area of the spherical surface was 80% of the closed curved surface (other than the cylindrical portion) on both sides. Note that the three grooves in the center portion are attached as targets for hanging a rope, and may not have rigidity.

The groove has a thickness t = 5 mm and a depth d.
= 3t, the width w of the groove was 2.7d, and the distance L from the boundary between the curved surface and the cylinder to the center of the groove was L = 0r. In this example,
A conventional injection-molded product having the same strength of 27 kg and a blow-molded product of 25 kg can be reduced in weight to 15 kg.
In this embodiment, the life of a conventional foam molded product or blow molded product is about 2 to 3 years, and that of an injection molded product which is about 5 to 6 years is extended to 10 years by 2 to 3 times. Was completed.
Note that there was no generation of debris and the like for the last 10 years.

(Embodiment 2) FIG. 9 shows that the depth d of the groove in FIG.
In this example, the rigidity is increased (displacement is reduced) as shown in FIG. 4.

(Embodiment 3) FIG. 10 omits a groove (target groove for rope) outside the range of distance L from the boundary between the curved surface and the cylinder of the present invention to the center of the groove irrespective of the rigidity of the groove in FIG. 8, the distance L from the boundary between the curved surface and the cylinder to the center of the groove was changed from 0r to 0.17r. As shown in FIG. 6, the rigidity of the product of FIG. However, the performance such as the life was not much different from the product of FIG.

(Embodiment 4) FIG. 11 shows the radius R of the spherical surface of FIG.
Is changed to 2r, and the position of a groove (a target for rope hanging, etc.) outside the range of the distance L from the boundary between the curved surface and the cylinder of the present invention to the center of the groove irrespective of the rigidity of the groove is changed. Although the rigidity of the product of FIG. 11 is lower than that of the product of FIG. 8 (displacement is larger), the performance such as the life is not much different from that of the product of FIG.

(Embodiment 5) FIG. 12 shows the distance from the boundary between the curved surface and the cylinder of the present invention to the center of the groove irrespective of the rigidity of the groove in FIG.
The position of the groove outside the range of L (such as a rope-hanging target) is changed within the scope of the present invention. However, as shown in FIG. 7, if there is at least one groove on one side, it does not affect rigidity. Therefore, in this embodiment, the rigidity did not differ between the product of FIG. 12 and the product of FIG.

(Embodiment 6) FIG. 13 is a perspective view of a float for oyster cultivation raft of the present invention. The raw material is a resin which is 100% recycled from the waste material of the automobile fuel tank. The shape is a hollow cylindrical shape having substantially hemispherical ends. The dimensions are 1250 mm in length, 700 mm in diameter and 5 mm in average wall thickness. Since the specific gravity of the raw material itself is approximately 1 g / cm ³ , the NET weight as a product is about 15 kg, and the maximum buoyancy is about 400 kg. The strength is calculated to withstand the water pressure at a depth of 5 m. The three grooves provided circumferentially on the body of the product are grooves for improving the rigidity at the two ends, and the middle one for binding and fixing the float to the raft. It is for hanging a rope.

(Example 7) FIG. 14 shows the results of using the molded article having the shape of the example shown in FIG. 13 for 5 years while changing the weight ratio of the gasoline tank recycled material. As shown in the figure, when the weight ratio of the recycled material is 70% or less, cracking or tearing occurs, and the ratio at which the float cannot be used, that is, the defective rate sharply increases. For this reason, the weight ratio of the recycled material is desirably 70% or more. In FIG. 14, ● represents the case where only talc was mixed, and □ represents the case where talc and PP were mixed at a weight ratio of 2: 1. In a similar manner, when the weight ratio of the recycled material became 70% or less. The failure rate rises sharply. For example, when the ratio (wt%) of the recycled gasoline tank material is 65%, when the remaining 35 wt% is talc (marked with ●), when the defective rate is 1.5%, 3%, and 5.5% There is
When talc + polypropylene (PP) was used, the defective rate was 0.5% and 2.5% in some cases.

[0048]

According to the present invention, H containing polyamide resin as one layer
The waste material of the multilayer blow-molded product of the automotive fuel tank containing MHDPE as the main component is just 3 to 10% by weight of polyamide resin.
In addition, the low surface smoothness, abrasion resistance and self-lubricating property of the HMHDPE resin were compensated for, and a molded article having excellent surface smoothness, abrasion resistance and self-lubricating property could be produced.
In particular, it is most suitable for use as a float for shellfish cultivation rafts. As a result, the production cost can be remarkably reduced, and the effective use of the waste material of the automobile fuel tank, which has been difficult to reuse until now, has been enabled. This also contributes to the prevention of global environmental pollution by plastic waste, and has the effect of two birds per stone.

A float having high rigidity against water pressure due to the curved surface structure including the cylindrical portion and the spherical surface, and a float having high rigidity against buoyancy and the load of a raft or the like can be made by blow molding due to the groove structure. It is rigid and integrated, so it can be made thinner and lighter, cost can be reduced, and workability is excellent. In addition, as for the life, since the deformation is reduced, the stress is dispersed and bridged, resulting in a longer life.
In addition, it is environmentally clean without generating debris like a foam molded product. In addition to this, the adhesion of shells and the like is smaller than that of a foamed article having fine irregularities of a foamed article, and the shelling operation can be reduced.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view schematically showing a blow molded product float of the present invention.

FIG. 2 is a relation between a maximum displacement amount and a spherical radius R;

FIG. 3 shows the maximum displacement and the ratio of the area of the spherical surface to the curved surfaces at both ends.

FIG. 4 shows the relationship between the maximum displacement and the depth d of the groove.

FIG. 5 is a relationship between a maximum displacement and a groove width w.

FIG. 6 shows the maximum displacement and the distance L from the boundary of the cylinder to the center of the groove.
The relationship is

FIG. 7 shows the relationship between the maximum displacement and the number of grooves from the boundary of the cylinder.

FIG. 8 is a cross-sectional view schematically showing an embodiment of the blow molded product float of the present invention.

FIG. 9 is a cross-sectional view schematically showing an embodiment of the blow molded product float of the present invention.

FIG. 10 is a cross-sectional view schematically showing an embodiment of the blow molded product float of the present invention.

FIG. 11 is a cross-sectional view schematically showing an embodiment of the blow molded product float of the present invention.

FIG. 12 is a cross-sectional view schematically showing an embodiment of the blow molded product float of the present invention.

FIG. 13 is a perspective view of a float used for a raft for oyster culture, showing an example of a molded product utilizing the waste material of the present invention.

FIG. 14 is a graph showing a relationship between a weight ratio of a recycled gasoline tank material in a molding resin and a defective rate in a blow molded product of a float.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) C08L 77:00) B29K 23:00 77:00 105: 26 B29L 22:00 31:00 31:30 (72 Inventor Shinji Imamura 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Corporation Technology Headquarters (72) Inventor Tsutomu Kaneda 20-1 Shintomi, Futtsu City, Chiba Prefecture Nippon Steel Corporation Technology Headquarters

Claims (2)

[Claims] 1. A recycled resin produced as a fuel tank for automobiles and containing 70% by weight of a recycled resin obtained by recycling waste material of a multilayer resin blow-molded article containing high molecular weight high density polyethylene (HMHDPE) and polyamide (PA). Including
The weight ratio of the PA component to the HMHDPE component is 3 to 1
A blow-molded article obtained by blow-molding 0% thermoplastic resin. 2. The blow-molded article according to claim 1, which is used as a float for a culture raft.