WO2003089219A1 - Procede de production d'un composite expanse de plastique - Google Patents

Procede de production d'un composite expanse de plastique Download PDF

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Publication number
WO2003089219A1
WO2003089219A1 PCT/JP2003/004989 JP0304989W WO03089219A1 WO 2003089219 A1 WO2003089219 A1 WO 2003089219A1 JP 0304989 W JP0304989 W JP 0304989W WO 03089219 A1 WO03089219 A1 WO 03089219A1
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WO
WIPO (PCT)
Prior art keywords
mold
plastic foam
plastic
foam composite
skin
Prior art date
Application number
PCT/JP2003/004989
Other languages
English (en)
Japanese (ja)
Inventor
Naonori Shiina
Hideo Sekiguchi
Akira Kitaichi
Hiroo Miyairi
Original Assignee
Shiina Kasei Co.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Shiina Kasei Co. filed Critical Shiina Kasei Co.
Priority to AU2003227430A priority Critical patent/AU2003227430A1/en
Publication of WO2003089219A1 publication Critical patent/WO2003089219A1/fr

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/04—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities
    • B29C44/0407—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles consisting of at least two parts of chemically or physically different materials, e.g. having different densities by regulating the temperature of the mould or parts thereof, e.g. cold mould walls inhibiting foaming of an outer layer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
    • B29C44/02—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of definite length, i.e. discrete articles
    • B29C44/10—Applying counter-pressure during expanding

Definitions

  • the present invention relates to a method for efficiently and inexpensively producing a plastic foam composite comprising a plastic skin and a polyolefin foam core. Further, the present invention relates to the use of the plastic foam composite produced by the method as a heat insulating material, a building material, a cushioning material, a shock absorbing material, a flotation material, an anticorrosion member, and the like. Background art
  • Plastic foam is made up of extremely small bubbles and a thin film of plastic surrounding the bubbles.
  • the volume of gas occupying the whole is small and the convection is small, so good heat insulation, cushioning and buoyancy are achieved. It is.
  • Foam is an extremely excellent material with these features, but it is difficult to use by itself due to its low strength.It also absorbs moisture due to the thin cell membrane and reduces heat insulation, and is used because the film is stretched. It has disadvantages such as shrinkage over time and poor weather resistance.
  • As a method of solving such a drawback there is a technique of forming a thick skin on the surface of a plastic foam.
  • a skin is formed by rotational molding, and polyurethane is injected into the skin and foamed.
  • this method improves strength and hygroscopicity to some extent, the skin and core do not adhere, and the bending strength, torsional strength, and impact strength are not sufficient.
  • the foam is made of two different materials, it is difficult to recycle the foam, and there are problems such as high cost due to the two manufacturing processes. Furthermore, it is difficult to foam the skin and to provide a reinforcement for the core.
  • One of the other techniques is to make the skin by blow molding, put the pre-foamed particles into it, and heat it.
  • This method has the disadvantage that heating cannot be performed at a high temperature, so that gaps remain between core particles and become moisture passages to absorb moisture. Poor adhesion between the skin and core results in low flexural, torsional, and impact strength.
  • this method does not allow for the formation of large foamed composites, making it difficult to foam the skin and to provide a reinforcement in the core.
  • a technique in which a plastic powder and a crosslinked foamable granular material are put into a mold, and a foamed composite including a skin and a core is formed by rotational molding.
  • An object of the present invention is to provide a plastic foam composite in which a foam core and a plastic skin are bonded and integrated with sufficient strength, excellent heat insulation properties, and do not absorb moisture even when used for a long time, at a low cost. It is to provide a method of manufacturing with.
  • Another object of the present invention is to provide an excellent building material, cushioning material, shock absorbing material, flotation material, anticorrosion member, and the like using the foamed composite.
  • the material is heated while rotating the mold at a speed at which centrifugal force is not applied, a plastic skin is formed on the inner surface of the mold, and polyolefin particles are adhered to the inner surface of the skin.
  • the granulate of a polyolefin is expanded toward the inner mold from the inner surface of the epidermis, the pressure in the mold 1. 5 to 5. in the 0 kgf / cm 2 expanded
  • the above object of the present invention is to provide a method for producing a plastic produced by the production method. Achieved by the foam composite.
  • FIG. 1 is a photograph showing a cross section of a plastic foam composite comprising a skin 1 and a core 2 as one embodiment of the present invention.
  • FIG. 2 is a photograph showing a cross section of a plastic foam composite including a skin 1, a core 2, and a section 3 as one embodiment of the present invention.
  • FIG. 3 is a photograph showing a cross section of a plastic foam composite comprising a low-expanded foam skin 4 and a low-expanded foam core 2 as one embodiment of the present invention.
  • FIG. 4 is a photograph showing a cross section of a plastic foam composite comprising a non-foamed skin 1, a low-magnification foamed skin 4 and a high-magnification foamed core 2 according to an embodiment of the present invention.
  • FIG. 5 is a photograph showing a cross section of a plastic foam composite having a hollow portion 5 as one embodiment of the present invention.
  • FIG. 6 is a photograph showing a cross section of a plastic foam composite in which rubber and plastic waste material 6 according to one embodiment of the present invention are put in a core.
  • FIG. 7 shows the plastic foaming at the time of 15 minutes, 20.5, 22.5, 23.5, and 25 minutes after the start of heating in the process of molding the plastic foam composite by the production method of the present invention.
  • 4 is a photograph showing a cross section of the composite.
  • FIG. 8 is a photograph showing a cross section of a heat insulating box made of a plastic foam composite as one embodiment of the present invention.
  • FIG. 9 is a graph showing the heat insulation performance of the heat insulation box made of the plastic foam composite according to one embodiment of the present invention.
  • FIG. 10 is a cross-sectional view showing one embodiment of a mold used in the present invention.
  • the mold consists of an inner box 13, an outer box 12 and a bottom plate 11 of the outer box, and is fixed by a flange 14.
  • the inner box 13 and the outer box 12 have small holes 15 for releasing gas.
  • FIG. 11 shows a plastic foam composite A having a convex portion 21 and a concave portion and a plastic foam composite B having a concave portion 22 according to an embodiment of the present invention. It is an exploded perspective view showing a closed box. BEST MODE FOR CARRYING OUT THE INVENTION
  • the plastic foam composite of the present invention is to provide a heat insulating material which has excellent heat insulating properties, can be used for a long period of time without absorbing moisture to lower the heat insulating properties, and has low energy consumption throughout the entire period of use. This contributes to the prevention of global warming.
  • the plastic foam composite of the present invention has a specific gravity of one-third that of wood and is a rigid body that is lightweight and has strength comparable to wood, or a lightweight elastic body that is not broken even when subjected to impact force. Used for building materials, cushioning materials, shock absorbing materials, flotation materials, etc.
  • the present invention contributes to the preservation of the global environment by making use of recycled plastic materials and plastic wastes as raw materials, making alternatives to wood.
  • the foamed composite of the present invention can produce a product having excellent impact resistance by using a low-magnification foam as a skin, and by being partitioned in a core, it does not break even when deformed, and has excellent strength. It is possible to make a product.
  • the production method of the present invention enables such a product to be produced in one step at low cost, and a low-density, void-free, particle-boundless integrated core as shown in FIG. 1 is obtained.
  • the size of the plastic powder or fine particles is smaller than 1/3 of the particle size of the crosslinked and expanded polyolefin granules (hereinafter also referred to as granules). That is, the difference in volume ratio and weight ratio should be more than 27 times. Large particles have a slow temperature rise, are difficult to adhere to the heated mold inner surface, and can be made of high-density polyethylene (HDPE) with a high melting point as the skin, and low-density polyethylene (LDPE) with a low melting point as the core. .
  • HDPE high-density polyethylene
  • LDPE low-density polyethylene
  • the particulate polyolefin used in the present invention contains a crosslinking agent that decomposes when heated and crosslinks the polyolefin, and a foaming agent that generates gas when decomposed. Rubber elasticity is developed in the molten polyolefin by cross-linking, and the elastic modulus at the time of melting becomes several times that of polyolefin. The foaming agent is decomposed there, so the gas is trapped inside the polyolefin and uniform and fine bubbles are formed. A low-density core can be made efficiently.
  • the polyolefin is The expanded and expanded polyolefin adheres to the epidermis and does not shrink, allowing the core to be fifty times higher than otherwise obtainable.
  • the expansion of the granular material is performed from the inner surface of the mold toward the center of the mold, and the air in the mold collects at the center of the mold. For this reason, gas can be vented by attaching a heat-insulating pipe to the mold, and a core without a void can be manufactured.
  • the amount of the foaming agent is determined so that the inside of the mold is in a pressurized state.
  • the core is maintained in a pressurized state from foaming to cooling and solidification, and has excellent strength, good dimensional accuracy, and no shrinkage due to the advantage that the skin is not strained because it is made by rotational molding. It becomes a plastic foam composite (hereinafter, also referred to as a molded product).
  • the skin and the core are integrally formed, and are lightweight and strong, deformed by an impact but are not broken, and have good heat insulating properties. Suitable for body production.
  • the skin can be made of foam, and as shown in FIG. 3, R is formed at the inner corner of the skin to increase the rigidity of the molded body.
  • the molded body has a shape holding a mold, the molded body can be easily removed from the mold, and a mold without a taper can be used.
  • the reason why the skin can be foamed in the present invention is that it is molded in a mold.
  • the present invention when a granule composed of two layers of plastic is used in which the surface of the crosslinked foamed granule used is coated with a non-foamed or slightly foamed plastic, a large number of compartments are formed in the foamed core. Are formed, and these form a foam composite '(Fig. 2) having a structure connected to each other and to the epidermis.
  • plastic sandwich composites have been difficult to use as structural materials due to the low compressive strength of the core.
  • the molded article with compartments of the present invention can improve the compressive strength, bending strength, impact strength, impact absorbency, etc.
  • this section has a shape in which regular 12 dihedrons are entangled, so it has no directionality. When an external stress is applied, the stress is quickly dispersed throughout the compact, and the compact is deformed. Even if it recovers, it does not destroy. Conventionally, a lightweight or strong molded article made of plastic has been produced, but a lightweight and strong molded article has not been produced. According to the present invention, a lightweight and strong plastic foam composite is provided for the first time. And, the foamed composite with compartments in the present invention The coalescence is due to the use of cross-linked polyolefin in the core, which foam expands strongly to a similar shape.
  • the mold is rotated by biaxial rotation, swing rotation, or the like.
  • the rotation speed is usually set to 1 to 20 rpm so that centrifugal force is not applied to the material in the mold. It is preferable that the rotation of the mold is alternately repeated between forward rotation and reverse rotation. As long as the centrifugal force is not applied, the higher the rotation speed, the better the molded body in which the skin and the core are well separated.
  • the amount of powdered plastic and polyolefin granules in the mold should be less than 85% of the volume in the mold so that the material can move in the mold during rotation.
  • the mold is heated by hot air, open flame, oil heating in a mold in which a pipe is welded, or the like.
  • the heating first forms the skin, on which the granules adhere, and when the mold reaches the temperature at which the foaming agent decomposes, usually 180 to 200 ° C, foaming occurs.
  • the decomposition temperature of the foaming agent is set to 170 to 190 ° C. in combination with the foaming aid and the time from the start to the end of decomposition is increased, a molded article without voids can be obtained, which is preferable.
  • the time required for heating is 15 to 30 minutes.
  • the molding is performed at a pressure in the mold of 1.5 kgf / cm 2 or more, preferably 1.5 to 5.0 kgf Zcm 2 .
  • the pressure also depends on the size of the compact, and using a large mold will increase the pressure. If packing is used in the mold contact area, the pressure inside the mold will exceed 5.0 kg iZcm 2 , which may cause voids in the molded product or deformation of the mold. If packing is not used, air escapes from the rubbed portion at the beginning of heating, but when the foaming agent is decomposed, a skin is formed, the mold becomes airtight, and the pressure inside the mold is 1.5 to 5. It rises to O kg fZcm 2 .
  • the pressure in the mold 1. Ri by the fact of molding 5 to 5. 0 kg f Zcm 2, foamed granules becomes the core of the integrated without a boundary, every corner of the mold by adhering the skin or And a foam composite without matter is obtained.
  • the pressure in the mold is determined by forming a small hole in the mold, and applying a pressure sensor (made by Entran, EPX-N03-500-7B-X20M /) to the molten skin material formed in the small hole. It is the value obtained by contacting Z * / L2.5M /).
  • a pressure sensor made by Entran, EPX-N03-500-7B-X20M /
  • the mold is immersed in water or cooled by a shower, and After that, the molded body is taken out.
  • the skin rapidly cools and solidifies, but the molten foam core in the center keeps high temperature and gradually solidifies under pressure, so that a molded product with high strength and low shrinkage as in the mold can get.
  • the time required for cooling is 15 to 30 minutes.
  • the mold is made of a metal having a thermal conductivity of at least 12 kca 1 / (m ⁇ hr ⁇ ) or a metal material such as iron, stainless steel, aluminum, etc. It is common to use a plate-like material or a veneer and to divide it into two parts or side walls and upper and lower lids. Ordinary rotational molding dies are made of sheet metal, and their thickness is generally 2 to 3 mm. However, gas pressure due to foaming is applied to the mold of the present invention, so that it is difficult to use a general mold, and a mold that can withstand an internal pressure of 5.0 kgf / cm 2 is used.
  • R at the corner of the mold is 5 mm or more.
  • the mold may be difficult to separate from the mold due to shrinkage during cooling of the molded body.Therefore, the mold should have a slope of 2Z100 or more, or the bottom should have a protruding structure.
  • the mold should be able to overlap the upper part of the inner box and the outer box, and the outer box should be separated from the bottom plate, making it easier to enter the material. , And facilitate the removal of the molded body.
  • a release plate may be provided between the protrusions of the inner and outer boxes.
  • FIG. One embodiment of the mold is shown in FIG. In this embodiment, when the temperature of the inner box is hard to rise and the skin becomes thinner, the heating of the inner box is increased.
  • a small hole having a diameter of 3 to 1 Omm is provided in the mold, and an air-insulating pipe is attached so that air in the mold can escape to the outside.
  • This pipe has one end outside the mold and the other end near the center of the mold.
  • a Teflon (registered trademark) tube is preferable.
  • a mold usually has only one small hole, but a mold with a large surface area or a complicated shape may have two or more holes. Rotational molding in a mold without small holes may cause voids in the core. If molding is performed using packing at the mating part of the mold, there is a tendency for voids to easily occur. After molding, the gas release pipe is removed, but after the pipe is removed, the material is filled with polyolefin and repaired to prevent moisture from entering.
  • a part of the used material be burrs. If the amount of Paris is too large, the thickness of the skin becomes thin. Therefore, adjustment of the mold is adjusted so that less than 1%, preferably 0.01 to 1% of the skin material becomes burr.
  • the plastic powder or fine particles are powders or fine particles of a thermoplastic resin having a particle diameter of 0.05 to 2 mm, such as polyolefin, polyamide, ABS, and polypinyl chloride.
  • a thermoplastic resin having a particle diameter of 0.05 to 2 mm
  • polyolefin polyamide, ABS, and polypinyl chloride.
  • HDPE is excellent in moldability, easy to form a foamed composite using crosslinked foamed polyolefin as core, has sufficient strength as a skin, and has the same core as polyolefin, so recycling of waste materials is easy.
  • the amount of the powdered plastic used in the present invention is preferably adjusted so that the thickness of the skin is lmm or more and 15mm or less when the plastic foam composite is molded. Softens the body but reduces moisture absorption. If the skin is thicker than 15 mm, heat will be transmitted through the skin and heat will be easily dissipated, reducing the thermal insulation of the foamed composite, and easily breaking due to impact.
  • plastic powder particle diameter: about 0.05 to 0.3 mm
  • particle diameter about 0.05 to 0.3 mm
  • Fine particles with a particle size of about 0.3 to 2 mm
  • the foam of the soft skin is formed by molding the skin using low-density polyethylene, forming a foam, or using high-density polyethylene to a thickness of 0.25 to 2 mm.
  • a composite may be made so that the foam composite can be fastened with paper or cloth.
  • the viscoelasticity at high temperature of the powdered plastic used as the material for the skin has a correlation with the skin having a uniform thickness.
  • the storage modulus used as the 1 X 1 0 5 P a exceeds the pin holes are generated in the skin, the expansion ratio of the core is to or easier lowered.
  • the skin is formed by rotational molding and the molding temperature is high, there is almost no distortion.
  • the skin is also easily made into a foam, it is possible to produce a molded article that is lightweight, resistant to impact, and has excellent heat insulating properties. If the skin is foamed three times, for example, the strength will be close to 1/3 of the non-foamed skin, but by increasing the thickness of the skin a little, the strength will be supplemented, and the amount of material used can be reduced as a whole .
  • the surface of the heat insulating material be spherical cells of 4 times or less.
  • the foamed composite of the present invention is used as a cushioning material, the skin has an elastic polyhedral structure.
  • the skin and the core have an intertwined structure and the joint is no longer planar, so that the skin and the core are well bonded and integrated.
  • the foamed skin in order to foam the skin, it is only necessary to mix a foaming agent with the powdered plastic, and the magnification can be freely adjusted.
  • the foamed skin can be formed inside the non-foamed thin skin by using small particles mixed with a foaming agent together with the powdered plastic, so that the heat insulation and the appearance can be improved at the same time.
  • Cross-linking of the epidermis is also possible, for example, by simply adding a cross-linking agent to the powdered plastic.
  • a foamed composite in which a soft skin is made by using a powdered plastic such as an ethylene monoacetate biel copolymer or an ethylene-ethyl acrylate copolymer is suitably used as a cushion material or the like.
  • an inorganic filler or fiber is blended into the skin material, so that the thickness of the skin can be made uniform and flame retardant.
  • carbon black or stainless steel fiber To prevent the generation of static electricity, and to improve the weather resistance by adding UV absorbers and antioxidants. Fungicides, antibacterial agents, pigments and the like can be mixed.
  • the polyolefin granules containing a cross-linking agent and a blowing agent used in the present invention are granules obtained by mixing a cross-linking agent and a foaming agent with polyolefin, or after mixing a polyolefin with a foaming agent, and then irradiating with ionizing radiation.
  • It is a crosslinked granular material having a particle size larger than that of the skin material, and preferably having a particle size three times or more.
  • polyolefin granules When polyolefin granules are crosslinked and foamed, uniform fine bubbles are formed, and these bubbles are stable even at the temperature at which the foaming agent decomposes (200 ° C), so that a foamed composite of skin and foam can be made.
  • Polyolefin molecules are gelled (ie, infinitely reticulated) by cross-linking, and when the gel fraction is 20% or more and 80% or less, the material is distributed in a well-balanced manner to the film, ridges and vertices of the bubbles.
  • the core polyolefin material is L DPE having a melt characteristic of MFR (melt flow rate) of 0.5 to 20 gZl Origin.
  • MFR melt flow rate
  • the core can be given strength.
  • Crosslinking agents used in the present invention include dicumyl peroxide, di-butyl peroxide, di-t-butylperoxyisopropylbenzene, 2,5-dimethyl-2,5-di (t_butylperoxy) hexane, Organic peroxides such as t-butylpyroxide and di-t-hexyl peroxide.
  • the amount of the crosslinking agent mixed with the polyolefin is 0.1 PHR or more and 1.0 PHR or less, preferably 0.1 PHR or more and 0.8 PHR or less, more preferably 0.3 PHR or more and 0.6 PHR or less. If the amount of the cross-linking agent is too small, gas escapes, bubbles become coarse, and the core does not fill the inside of the skin. On the other hand, if the mixing amount is too large, the expansion of the polyolefin is suppressed, and a void is generated at the corner of the mold. If the mixing amount of the cross-linking agent is appropriate, an integrated core is obtained in which the joined portions of the foamed granular materials are not known.
  • cross-linking agent As a part of the cross-linking agent to be mixed, use a cross-linking aid such as 1,2-polybutadientlyaryl cyanurate or trimethylolpropane trimethacrylate having two or more reactive double bonds in the molecule.
  • a cross-linking aid such as 1,2-polybutadientlyaryl cyanurate or trimethylolpropane trimethacrylate having two or more reactive double bonds in the molecule.
  • a cross-linking aid can be used to reduce the required irradiation dose to 50 OKGy to 2 MGy and to promote cross-linking of polyolefins that are difficult to gel.
  • preferred granules are polyolefin granules such as polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc. in which a crosslinking agent and a foaming agent are mixed, and have a particle size of 2 to 10 mm. Is preferred. Granules having a particle size of about 2 mm adhere to the entire surface of the skin during rotational molding, expand in the thickness direction during foaming, and easily form a void-free core. Large particles with a particle size of 5 mm or more can take in most of the generated gas, help to form uniform bubbles, and increase the radius of the corner of the mold.
  • the shape of the granular material is preferably a sphere, an ellipsoid close to a sphere, a rod having a length approximately equal to the diameter, a cubic body, a rectangular parallelepiped close to a cubic body, or the like, which is easily moved by rotation in a mold.
  • the blowing agent used in the present invention is a decomposing and exothermic blowing agent, and may be azodicarbonylamide, dinitrosontamethylenetetramine or a mixture thereof.
  • the amount of the foaming agent to be mixed with the polyolefin is 5 PHR or more and 40 PHR or less, preferably 10 PHR or more and 30 PHR or less. If the amount of the foaming agent is small, a sufficiently foamed core cannot be obtained, and if the amount is too large, the number of voids in the molded article increases.
  • a foaming aid such as zinc stearate, zinc white, and urea is used together with the foaming agent.
  • a blowing agent having a decomposition temperature of 200 ° C and a foaming aid are mixed with polyolefin mixed with a cross-linking agent, and the decomposition temperature of the blowing agent is lowered to 170 to 190 ° C, and crosslinking is performed. If the decomposition of the blowing agent is started before the reaction is completed, the core becomes a high-magnification foam, and a molded body having a small number ofological and a uniform thickness of the skin is obtained.
  • the amount of the foaming aid mixed with the polyolefin is preferably 1 PHR or more and 8 PHR or less, and more preferably 2 PHR or more and 6 PHR or less.
  • the use of zinc stearate is particularly preferable because stable foaming is performed.
  • the nucleating agent can be used in combination with the foaming agent to make the cells finer.
  • kneading is usually performed using a kneading device such as a kneader or a Banbury mixer at a temperature at which the crosslinking agent does not decompose.
  • polyolefin containing a cross-linking agent and a foaming agent is made into a plate shape by a roll and cut into granules, or extruded into a rod shape with an extruder and cut to form granules.
  • a kneading device capable of giving a high shear force to the material such as a twin-screw extruder, is used, a good dispersion state of the foaming agent can be obtained, and the decomposition gas can be effectively used.
  • a material having a non-foaming property or a slight foaming property by an injection molding method or an extrusion molding method on a surface of a polyolefin granular material used as a material of a foaming core specifically, contains a foaming agent.
  • a material containing 0.1 to 7 PHR of a foaming agent is coated, a section for dividing the foamed core is formed as shown in FIG. "A material having a slight foaming property" refers to a material that foams 1.2 to 7 times.
  • the material to be coated can be two layers of a hard material and a soft material.
  • the interval between the sections to be formed is 5 to 50 mm, and the thickness of the sections is 0.05 to 0.5 mm. Since the thickness of the skin and the thickness of the air bubbles are too different, if the thickness of the compartment is set to an intermediate thickness, the mechanical strength and elasticity of the molded body will be good.
  • a structure having compartments In the case of a foamed composite that requires light weight and strength, it is desirable to have a structure having compartments, and the compartments can be foamed, and the two-layer granular material can be foamed vertically in the thickness direction.
  • a foaming agent of 20 PHR or more is mixed with the polyolefin of the inner layer, little gas escapes, no voids are generated, and bubbles are not coarsened and low. It can be a core of high density.
  • a composite having a highly foamed core such as 50-fold foam and a thick skin of 2 mm or more can be produced.
  • a foamed composite has high heat insulation properties and does not easily absorb moisture. Because it has advantages, it can be used in humid places and underwater.
  • the outer skin can be foamed two to three times to further improve the heat insulation. The decrease in the strength of the skin due to foaming can be compensated for by increasing the thickness of the skin, and a thicker skin results in a molded article that is more resistant to bending.
  • the core has a density of 0.1 lg / cm 3 or less having uniform fine bubbles.
  • a foam When a foam is used and the cross-sectional area of voids generated in the formed body is set to 100 mm 2 or less, a foam composite having particularly good heat insulating properties can be obtained.
  • carbon black, an ultraviolet absorber, and an antioxidant are added to the skin and molded, the service life outdoors can be reduced to 50 years, and in combination with excellent heat insulation properties, The energy saving effect during use will be extremely large.
  • Insulation tank for thermal storage air conditioning that uses surplus electricity at midnight ⁇ ⁇
  • the insulation material of the insulation plate is always in contact with water and exposed to humid environment, so the insulation material of the present invention exerts its maximum effect This is an application example.
  • the heat insulating tank of the present invention can be used by increasing the bottom thickness by 10 to 30% to improve the heat insulating property. Furthermore, the heat insulation can be further improved by reducing the thickness of the skin by 20 to 40%.
  • a hole with a skin can be made in the heat insulation tank, and a cock can be attached to it for use in putting in and out of water.
  • the skin preferably has a thickness of 2 mm or more to prevent the core from absorbing water.
  • foam sheet or aluminum foil that is attached to part or all of the surface of the foam composite to improve heat insulation and prevent moisture intrusion. It can be processed or covered with inorganic particles such as aluminum sheets and pebbles to make it flame-retardant, for example, roofing.
  • the foamed composite which is covered with aluminum foil to block moisture, is a good heat insulating material, and can be bonded to a foamed plastic sheet for better heat insulation.
  • Foam composite of the present invention there is relatively strong because the skin and foam core are well bonded, the apparent density of the compact 0. 0 7 g Z cm 3 or more, 0. 4 g / cm 3 below
  • the desk and the bed which are made to be lightweight are lightweight and suitable for the elderly and the physically handicapped.
  • the thickness of the foamed core is not particularly limited, but is usually 10 to 20 Omm. If it is less than 10 mm, it becomes difficult to produce the skin by rotational molding and adhere the granular material thereon smoothly. On the other hand, if the thickness exceeds 200 mm However, if such a large molded body is required, a hollow portion approximately similar to the molded body is provided in the center of the core as described later.
  • the thickness of the foam composite is not particularly limited, but if it is 25 mm or more, preferably 40 mm or more, the advantage of the sandwich structure is exhibited, and the side surface has a skin, so it has excellent bending strength and lightweight structure. Wood.
  • the foamed composite of the present invention is used for a cushion material, as described above, the skin also foams, and the cushioning property is further improved by using a two-layer foam.
  • the foaming ratio of the foamed core is 10 times or more and the foaming ratio of the skin is 5 times, it is suitable for cushioning materials, shock absorbing materials, and floating materials.
  • a foam composite bed with a 7x foam skin on a 30x foamed core layer can be laid down simply by laying sheets on it, making it easy to wash and disinfect. Yes, it becomes a hospital bed for infection control.
  • a composite having a foam layer below the skin and a hollow portion substantially similar to the molded body in the center can be produced.
  • Such a molded article is a lightweight and inexpensive product. Wear.
  • the granular material containing the cross-linking agent and the foaming agent is not reduced, irregularities can be formed on the inner surface. Therefore, it is desirable that the particle size is about lmm. If two layers of material are used, which do not foam on the surface of the larger foam particles or are covered with a slightly foaming material, as shown in Fig. 5, the strength is improved and the same effect as a double wall is obtained.
  • the compressive strength of this molded product is not much different from that of a molded product filled with foam with compartments up to the core, and the volume of the hollow part can be made 50% or more of the whole. It is also possible to make large compacts such as tanks.
  • the reason why the hollow foamed composite is formed in the present invention is that the crosslinked polyolefin with partitioning material foams well and has heat resistance.
  • the foamed composite containing compartments obtained by the present invention has good impact resistance and shock absorption, and has high compressive strength and bending strength, so it can be used as a cushioning material, flooring material, roofing material, levitation material, and shock absorbing material. It is suitable. With this foamed composite, it becomes possible to insert a metal fitting and firmly fix the metal fitting. For example, when a port having an apparent density of about 0.3 g Z cm 3 is formed in the present invention and a motor and a screw are mounted on the port, a durable motor port which does not sink even when capsized is obtained.
  • a floating plate may be used instead of the hull, and may be used as a motor-equipped floating plate for rescue of human life when the boat sinks.
  • this foam composite The body can be made to have the same compressive strength as the paper honeycomb structure, and it has the properties of elasticity, impact resistance, and water resistance that are not available in the paper honeycomb structure. It is expected to be used for airplane wings and stuffing of mega floats.
  • the characteristic of the foamed composite containing compartments, which deforms but does not break, is suitable for gasoline tanks of automobiles and contributes to prevention of fire.
  • the present invention even if plastic waste material, for example, the waste material of the foamed composite of the present invention is crushed into granules and placed in the center of the foam core, a molded product with high added value is produced. be able to.
  • the present invention can be used with waste materials such as rubber, FRP, and crosslinked polyolefin which are difficult to use in other methods. These waste materials are crushed to a size equivalent to or larger than the cross-linked expanded polyolefin granules, and the waste material is filled with 30% to 70% of the total amount. It is preferable to use it for thick plate materials and pillar materials.
  • the material used in the present invention is in a small amount, even if mud or sand is mixed, the influence on the molding is small.
  • the amount of the particles to be cross-linked and foamed is small, even if the particles having poor foaming property are mixed, it does not significantly affect the molding of the core.
  • it can be molded using recycled products, and the surface can be covered with a thin new material skin.
  • the foamed composite of the present invention can not only be recycled itself, but also can utilize other waste as a material.
  • the foamed composite with compartments of the present invention is made of plastic waste and used as a substitute for wood, it will contribute to effective use of resources.
  • recycled plastics and waste can be used because the cross-linked polyolefin foam foams well and stably.
  • a two-layer granular material in which a compound containing a crosslinking agent and a foaming agent is covered with a non-foaming or slightly foaming material can be formed into a foamed composite with a skin simply by heating it in a mold.
  • this foam composite has an uneven skin thickness, it can be made at low cost and is used as a cushioning material and a floating material.
  • a flame-retardant can be obtained by blending a flame retardant into the material of the skin, the foamed core and the compartment.
  • magnesium hydroxide must be used for the plastic and resin materials, which themselves have flame retardance, such as vinyl chloride resin, vinyl chloride copolymer and chlorinated polyethylene.
  • Hydroxylated Use plastic materials with flame retardancy by blending inorganic flame retardants such as Lumidium and antimony oxide, bromine flame retardants, phosphorus flame retardants, and silicon flame retardants I do.
  • a cross-linking agent and a foaming agent for the core, a cross-linking agent and a foaming agent
  • a polyolefin resin further containing the above-mentioned flame retardant can be used for the core.
  • a plastic film, a metal foil, a thin metal sheet, a composite film, or the like can be adhered to the surface of the molded body by forming and attaching a plastic film, a metal foil, a thin metal sheet, a composite film, or the like.
  • a foamed composite in which metal fittings such as bolts, nuts, and pipes are embedded can be formed, and a skin is formed on the surface of the metal fittings.
  • metal fittings such as bolts, nuts, and pipes
  • a skin is formed on the surface of the metal fittings.
  • a core having compartments because the core is firmly held. More specifically, for example, it is possible to attach a metal fitting for taking in and out of water to a large insulated container for storing surplus electric power at midnight, hot water used for solar heat, and cold water, making it difficult for the foamed composite to absorb water and moisture. It becomes an excellent container in combination with the features.
  • a convex portion may be provided on one molded body of the present invention, and a concave portion may be provided on another molded body, and these may be connected.
  • a concave part is provided in two molded bodies, and the two molded bodies can be connected to each other by a joining component having a volume obtained by combining the two concave parts. Since the molded article of the present invention can be molded with high dimensional accuracy and has a durable, durable and smooth skin, it can be firmly bonded and is hard to come off. The skin can be made of low-magnification foam to further increase the airtightness and prevent water leakage.
  • a taper is attached to the convex and concave parts to make it easier to fit, and can be connected without any gap.
  • An outer frame or the like can be provided by attaching a bracket to the corners and ridges of the connected foamed composite so that the connected foamed composite does not come off.
  • a columnar molded body of 100 ⁇ 100 ⁇ 2000 mm having a recess of 25 ⁇ 25 ⁇ 25 mm at a total of 10 places on both end faces and four side faces close to the end face was prepared.
  • Assemble the cube by connecting 12 columnar shaped bodies using wooden joints of X25X50mm.
  • the assembled cube has eight 25 x 25 x 25 mm recesses on each of the six sides.
  • a 200 x 2000 x 50 mm plate-shaped compact with a 25 x 25 x 25 mm recess is created and combined with the cube recess using a 25 x 25 x 50 mm wood fitting.
  • a strong room of 0 X 2000 X 200 mm is created.
  • This room can be connected to a two-story or three-story house.
  • the columnar or plate-like foam composites can also be used for play props, kindergarten playground equipment, and the like. Assuming that the columnar and plate-like molded bodies are a foam having a skin of 3 mm and a core of a foaming ratio of 30 times, the weights are 3.5 kg and 40 kg, respectively, and the apparent densities are 0.1 and 0.1, respectively. 0. a 2 g / cm 3.
  • a long cylindrical body (including a semicircular cylindrical body) having the shape of a male screw at one end and the shape of a female screw at the other end can also be produced.
  • the long cylinder has excellent strength, heat insulation, weather resistance, and water tightness, and can be easily connected, so that it can be used as a hot spring pipe or the like.
  • the skin at the part to be joined can be made thinner to increase heat insulation.
  • the long cylindrical body can be used as a duct by providing flame retardancy or providing a metal coating.
  • a connectable long semi-cylindrical sectioned foamed composite having concave and convex portions at both ends can be prepared, and a weight is added thereto so that the sea surface becomes the center of the semi-cylindrical concave surface.
  • the plates made of the foam composite of the present invention are arranged in a box shape, a frame made of a metal angle or the like is placed on the outside, and pressure is applied to a portion where the plates are in contact with each other by using a port attached to the frame, whereby the plates are put together.
  • the surface of the board can be made of low-magnification foam, water-swellable packing, or rubber rods or pipes can be used to eliminate water leakage and be used as a heat insulation room, a tank and a heat insulation pool. it can.
  • the boards are so tightly closed that no water leaks from that area.
  • an iron box can be placed in a foam composite box to increase its compressive strength, and buried in the soil to be used as a cable joint box or as a floating pier.
  • a metal drum containing vitrified high-level radioactive waste is put into this drum. If a thick layer of rubber, oil or a mixture of these, grease, polybutene, etc. is formed between two drums that does not flow at room temperature but flows when heated, water will not enter at all, so it will not flow in the water or in the soil. Storage is also possible.
  • Such a container is suitable for storing a substance requiring protection. If a molded body is formed by embedding metal fittings such as a port and a nut in the center with the elastic body of the foam composite of the present invention, it can be easily fixed to other objects.
  • Chairs with seats, armrests, and backrests can be molded by an integral molding method and used by attaching them to aircraft, Shinkansen vehicles, etc. In the event of a collision, etc., it is possible to reduce the risk of developing into a personal injury. Also, a table board made of a foam composite with embedded metal fittings is molded, and when the metal fittings are attached, the furniture becomes light furniture for the elderly and the physically handicapped.
  • a composite comprising an epidermis and a foamed core can be produced at a low cost in a single step, and the core is a high-magnification foam of 50 times, and the epidermis is a foam of spherical cells which does not absorb moisture. It is an excellent heat insulating material that does not decrease its thermal insulation even when used for many months. It can withstand 50 years of use and saves energy, and contributes greatly to preventing global warming.
  • the molded body composed of the skin and the core and the molded body with a section in the core have rigidity.
  • rigidity For example, with an apparent specific gravity of 1/3 of wood, the same strength and rigidity as wood can be realized. It can be applied to materials, pallets, building forms, suspension bridges and floating piers.
  • An elastic body made of a foamed skin is lightweight and durable. It can be deformed when impacted but does not break, does not hurt people, and can be used as a cushioning material, a shock absorbing material, and a floating material.
  • the present invention is a new technology that can make use of recycled plastics and wastes to produce wood substitutes.
  • Fig. 7 shows a photograph of a cross section of the molded body divided into two.
  • the mold temperature was 200 ° C
  • the core foam had a density of 0.05 gZcm 3 , had uniform voids without fine pores, and had completely adhered and integrated foam particles.
  • the plastic powder and the granules larger than this powder and crosslinked and foamed are placed in a mold, heated and molded while rotating, and there is a skin of uniform thickness on the foam.
  • the foamed composite as described above is obtained.
  • Example 1 when the amount of the foamed granular material to be put in the mold was reduced to 6 g, 5 g, and 4 g, and the molding was performed, the densities of the cores were 0.033, 0.025, and 0.020 g, respectively. / became cm 3. This is equivalent to the expansion ratio of 30 times, 40 times, and 50 times, and it is usually difficult to make a 50 times high-density foam of LDPE because the foam adheres to the epidermis and does not shrink. .
  • a foamed composite was produced in the same manner as in Example 1 using HDPE powder (main peak of particle size distribution: 0.1 mm) having different melting characteristics represented by the storage elastic modulus and the granular material used in Example 1.
  • the storage elastic modulus is 1 ⁇ 10 3 Pa or more, a good foamed composite having no voids and little unevenness of the skin is obtained.
  • a foamed composite was produced by the method of Example 1 using a piece having a side of 4 mm obtained by kneading 20 PHR of dicarbonamide.
  • V A mole fraction: vinyl acetate mole fraction
  • Example 3 The HDPE powder used in Example 1 and the MFR 1.5 gZl Omin LDPE produced by the autoclave method were mixed with 0.1, 0.3, 0.5, and 0.5. 7, 0.9 PHR and azodicarbonamide 2 respectively 0PHR, trimethylolpropane triacrylate 0.5 PHR was kneaded into a 4 mm-sided granular material, and a foamed composite was produced by the method of Example 1. As a result, as shown in Table 3, dicumyl peroxide does not foam well at 0.1 PHR, and at 0.9 PHR, a lot of voids are generated, and irregularities on the epidermis become severe. Thus, when the polyolefin is appropriately crosslinked, a good foamed composite is obtained. Table 3
  • Example 4 Using the obtained granules and the HDPE powder used in Example 1, a foamed composite was produced in the same manner as in Example 1, using a mold having an internal method of 100 ⁇ 100 ⁇ 25 mm. As shown in Table 4, the results showed that there was relatively little difference due to the cross-linking agent, and that the foam composites had a uniform thickness of the skin and uniform fine bubbles, and had few voids. . Table 4
  • Example 1 Compounding the HDPE powder used in Example 1 and the LDPE used in Example 1 with dicumylperoxide-0.5 PHR, azodicarbonamide 20 PHR, and zinc stearate as 1, 3, and 6 PHR Then, the granulated material having a side length of 4 mm was kneaded into a mold having an internal method of 200 ⁇ 200 ⁇ 50 mm, and a foamed composite was produced at the same rotation speed and temperature as in Example 1. The results show that, as shown in Table 5, when zinc stearate was high, the unevenness of the epidermis was small, and the occurrence of causal was reduced.
  • the decomposition temperature of a mixture obtained by adding 1 part, 3 parts, and 6 parts of zinc stearate to 20 parts of azodicarboxylic acid was measured.
  • zinc stearate as a foaming aid, a preferable foamed composite can be obtained by lowering the decomposition temperature of azodicarbonamide as a foaming agent.
  • the resulting foamed composite was cut, and the adhesion between the skin and the foamed core was measured. As a result, it was found that the strength was higher than the core strength. Then, the pressure in the mold 2. 5 to 2. 9 kg f Zcm 2, the core was a core piece that does not know the boundary of the particle.
  • Zinc stearate Skin irregularities Bubble Foam air force-Honamite, In-mold pressure Compounding amount (minimum thickness / ha, decomposition temperature (kg / cm 2 )
  • Example 7 In the same manner as in Example 7, by changing the blending amount of zinc stearate to 6 PHR and changing the amount of HDPE powder used to 122 g, 241 g, and 467 g, the foam composite having a skin thickness of lmm 2 mm 4 mm was obtained. made. In addition, the mold internal pressure and the surface temperature during molding were measured. As shown in Table 6, when the formed skin is lmm, the pressure in the mold is low and the foamed granules are exposed on the skin, and the skin is not uniform. As a result of further study by changing the amount of the HDPE powder used, it was found that the preferable in-mold pressure for forming a uniform skin was 1.5 to 5.0 kg fZcm 2 .
  • a foam composite was produced in the same manner as in Example 8 except that the furnace temperature of the rotary molding machine was set to 200 ° C, 230 ° C, and 260 ° C, respectively.
  • the results are shown in Table 7.
  • Table 20 the irregularities of the skin are large, many voids are generated, the bubbles in the core are coarse, and some voids have a cross-sectional area of more than 100 mm 2 .
  • 230 T and 260 ° C. a good molded product was obtained.
  • the amount of zinc stearate was set to 6 PHR, a small hole was made in the center of the bottom of the mold, and a Teflon tube having a diameter of 5 mm was inserted into the small hole.
  • the Teflon tape with a small hole was wrapped around the tip inside the mold, and degassing was performed during molding to produce a foam composite.
  • a composite foam was produced using a mold with no small holes and without degassing, and compared. As a result, as shown in Table 8, the occurrence of voids can be reduced by degassing.
  • the blending amount of zinc stearate was set to 6 PHR, and granules to be cross-linked and foamed were formed so that each side thereof was 1357 mm.
  • a foam composite was molded using a 0 ⁇ 50 mm mold.
  • Table 9 when the granular material size is l mm, the skin has many irregularities, many voids are generated, the separation between the skin and the core is poor, and a part of the skin material is mixed into the core. .
  • the size of the granular material is 5 mm or more, both unevenness of the skin and generation ofchro are small. Table 9
  • the foam composite A composed of the skin and the foam core exhibits an excellent low thermal conductivity, and the thermal conductivity further decreases as the foam composite B by foaming the skin.
  • foamed composite C with a partition has excellent mechanical strength but high thermal conductivity, and has a problem as a heat insulating material.
  • the material of the compartment is made thinner such as foam composite D, it is possible to lower the thermal conductivity.
  • a foam composite comprising a 1, 2, or 3 mm-thick skin made of HDPE and a 30-fold LDPE foam core was produced.
  • a sample of the same size of a commercially available polystyrene foam expanded about 50-fold and a commercial crosslinked polyethylene foam expanded about 30-fold were placed in water at room temperature, and the P and 7_R amounts were measured.
  • the foamed composite having an average skin thickness of 1 mm absorbed water, but those of 2 mm and 3 mm did not absorb water at all.
  • skinless polystyrene foam and cross-linked polyester All the Renfoms absorbed water significantly.
  • a foam composite A was prepared in which one concave portion was provided, and a total of three convex portions 21 were provided on the surface of 270 ⁇ 3 Omm and on both surfaces of 300 ⁇ 3 Omm so as to be able to be combined with the concave portion.
  • Example 16 In the same manner as in Example 14, four foam composites of 30 ⁇ 300 ⁇ 30 mm for the side wall and one foam composite of 300 ⁇ 300 ⁇ 3 Omm for the bottom plate were formed into a box shape. Then, the box of the foam composite was put in a frame made of an iron angle, and the port was used to apply pressure to the contact portion of the board using the angle. The box was sealed by applying pressure, and did not leak even if it was used for a long time with water. When the skin of the foamed composite has the same foamed structure as in Example 12, watertightness is further improved. [Example 16]
  • the inner method is a mold of 2000X1000X200mm.
  • the particle size is 0.11] 1 ⁇ 0? £ (liner low density polyethylene) powder of 1111, and the fine particles and particle size of L DPE which foams 7 times with lmm particle size are 5
  • a foamed composite was formed using a crosslinked LDPE granule that foamed 20 times in mm.
  • a molded product having a hollow portion of about 1900 ⁇ 900 ⁇ 100 mm as shown in FIG. 4 was obtained.
  • this is used as a mat, it is durable, has good cushioning and heat insulation properties, can sleep only by laying sheets on it, can be washed and disinfected, and is good as a mattress for infection control used in hospitals.
  • the HDPE powder used in Example 1, the crosslinked foamed LDPE granules used in Example 1, and two old golf poles as a model of plastic waste were placed in a mold with an internal method of 100 ⁇ 100 ⁇ 100 mm.
  • the mixture was heated at 230 ° C. for 30 minutes to obtain a molded body.
  • a molded body with an apparent density of 0.26 gZcm 3 and no matter was obtained, and this molded body was integrated with a 2 mm skin and a golf pole inserted into the center of the foam as shown in Fig. 6 and welded.
  • the compressive strength (yield point JIS K7208) was 7.5 kg f / cm 2 .
  • Fig. 8 shows a photograph of the cross section of the heat insulation box as an example. .
  • HDPE double wall box consisting of 2 mm thick skin only.
  • the apparent density is 0.094 g / cm 3 0
  • Insulated box with 2mm thick HDP E skin and 20x core foam of LDPE foam composite insulation box.
  • the apparent density is 0.139 g / cm 3 .
  • the insulated box was filled with hot water at 80 ° C, and the change in water temperature at room temperature of 25 ° C was measured. The results shown in Fig. 9 were obtained.
  • the temperature drop of the double wall box is the fastest.
  • the foamed composite insulation box has good heat retention.
  • a foamed composite having a 20-fold foam as the core has the highest heat insulation.
  • the foamed composite with compartment has a slight decrease in heat retention, it is possible to increase the heat insulation while maintaining the excellent strength by making the compartment low foaming.
  • the dimensional change of the insulated box was measured for 6 months after molding.
  • the foam composite insulated box, including the shrinkage due to temperature change showed slight shrinkage (3%) during the first three days, but then shrank. It was found that there was no deformation such as strain, etc., and there was no practical problem.
  • Example 12 The following four types of samples were molded in the same manner as in Example 12 using a 100 ⁇ 100 ⁇ 100 mm inner mold, and the compressive strength was measured according to the method of JIS K7208.
  • the compressive strength is defined as the yield point because no compressive failure occurs.
  • HDPE with a skin thickness of 2mm, a core with a structure of 20x foam of LDP E with compartments, and a hollow compartmented foam composite with a hollow part of about 70 x 70 x 70mm in the center Body sample
  • Table 12 shows the measurement results.
  • the strength of the foam composite sample is almost twice as high as that of the HDPE sample with only the skin, and the effect of filling the foam inside is significant.
  • the strength of the foamed composite sample with compartment is about 4 times, which is very large, and the decrease in strength is small even if there is a hollow inside. No. 2
  • the following three types of plate-like molded bodies were prepared in the same manner as in Example 12, the distance between the fulcrums was set to 20 Omm, and a bending test was performed (according to the method of JIS K7203). ).
  • the yield strength was used as the bending strength because no fracture occurred.
  • HDPE hollow plate with a thickness of 2 mm
  • the measurement results are shown in Table 13. Compared to the HDPE hollow plate, the foam composite plate shows almost the same value, and the effect of filling the inside with the foam is small. On the other hand, the strength of the foamed composite board with compartments is very high, which indicates that it can be used as a good sandwich structure.
  • Example 12 Using a 100X100X25mm mold, the following four types of plate-like molded bodies were made in the same manner as in Example 12, and the impact test was performed using a falling ball instrumented impact tester (Instrumented Impact Test Machine).
  • HDPE with a skin thickness of 2mm and a 20x foam core of LDP E Table 14 shows the measurement results for the foamed composite with compartments consisting of a core with a compartment having a thickness of 1/2 that of the case.
  • the foamed composite with compartments has a large impact force and high shock absorption.
  • a composite having a thin compartment has a small impact force but a large impact absorption. .
  • a plastic powder or fine granules and a polyolefin granule larger than the powder or fine granules and crosslinked and foamed are placed in a mold, heated while rotating, and the pressure in the mold is reduced to 1.5 to 5.0 If kg f ZCM to 2, the skin and the foam core has good rather adhesion, no foam composite of integral void as no boundary of the expanded beads in the core can be produced in one step.
  • This molded article is lightweight, strong, has excellent heat insulation properties, and hardly loses its insulation due to moisture absorption. For example, it is used as a heat insulating material for a long term of 50 years and contributes to the prevention of global warming.
  • composites with foamed skin, composites with compartments in the core, and composites with hollow cores can be made.
  • this compact is made from recycled plastic, and other waste is put in the center of the compact to create a wood substitute, which is also expected from the viewpoint of effective use of resources.

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  • Manufacture Of Porous Articles, And Recovery And Treatment Of Waste Products (AREA)
  • Laminated Bodies (AREA)

Abstract

L'invention concerne un procédé destiné à produire un composite expansé de plastique et consistant à placer une poudre de fines particules d'un plastique et des granules de polyoléfine contenant un agent de réticulation et un agent gonflant présentant une taille supérieure à celle de la poudre de fines particules dans un moule épais de sorte qu'ils puissent se déplacer dans ce moule, à chauffer le moule en cours de rotation de manière à former une couche superficielle de plastique et à permettre aux granules de polyoléfine d'adhérer à l'intérieur de cette couche superficielle, à chauffer à nouveau le moule jusqu'à la température de décomposition de l'agent gonflant de façon à produire un gonflement et à expanser les granules de polyoléfine à partir de la surface intérieure vers l'intérieur du moule, d'où l'obtention d'une pièce ne présentant pas de frontières entre les granules expansés, tout en maintenant la pression à l'intérieur du moule à un niveau compris entre 1,5 et 5,0 kgf/cm2, puis à refroidir et durcir la couche superficielle et le noyau expansé résultant. Ce procédé peut être utilisé pour produire un composite expansé de plastique constitué d'une couche superficielle en plastique et d'un noyau en mousse de polyoléfine avec une efficacité élevée et à moindres frais.
PCT/JP2003/004989 2002-04-19 2003-04-18 Procede de production d'un composite expanse de plastique WO2003089219A1 (fr)

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WO2006112394A1 (fr) * 2005-04-15 2006-10-26 Shiina Kasei Co. Mousse plastique composite et procede pour la produire
WO2008078818A1 (fr) * 2006-12-27 2008-07-03 Shiina Kasei Co. Procédé de production de structures plastiques en sandwich
JP2016078292A (ja) * 2014-10-15 2016-05-16 株式会社ジェイエスピー 表皮材被覆発泡粒子成形体

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WO2006112394A1 (fr) * 2005-04-15 2006-10-26 Shiina Kasei Co. Mousse plastique composite et procede pour la produire
WO2008078818A1 (fr) * 2006-12-27 2008-07-03 Shiina Kasei Co. Procédé de production de structures plastiques en sandwich
JP2016078292A (ja) * 2014-10-15 2016-05-16 株式会社ジェイエスピー 表皮材被覆発泡粒子成形体

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