JP2001107569A - Corner cover made from polyolefinic resin foam of high combustibility at low temperature - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide at low cost a corner cover made from polyolefinic resin foam of high combustibility at low temperatures, having performance such that it is excellent in cushioning property and resiliency and is easy to fit yet hard to remove, showing a high combustion efficiency at low temperatures in low oxygen concentrations such that when incinerated with other garbage, it generates little residual ash, and capable of reducing production of harmful matter. SOLUTION: The composition of a polyolefinic resin foam molding having a wrapping piece capable of wrapping the corners of a subject by means of its restoring resiliency contains ferric hydroxide particles or iron oxide particles.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention relates particularly to building materials, fittings,
Improvement of corner covers used to protect corners of furniture, etc.More specifically, when incinerated, they do not generate excessive heat even under low oxygen conditions, and do not generate harmful substances such as dioxin The present invention relates to a low-temperature and high-combustibility foamed polyolefin resin corner cover capable of gently and efficiently burning in a state close to complete combustion.

[0002]

2. Description of the Related Art As is well known, in a building under construction, inadvertent damage may be caused to pillars, beams, fittings, or corners that are not dried. In steel-framed buildings,
It is very dangerous for an operator to hit his head on a beam or the like. Conventionally, in order to solve such a problem, a thick paper or a thick cloth is attached to a pillar or a beam to prevent an obstacle. However, the attachment of the thick paper or a thick cloth requires a lot of trouble. Therefore,
Recently, a foamed resin corner cover (for example, Japanese Patent Application No. 11-116409 of the present applicant) has come to be provided, and is popular because of its good cushioning property. I'm starting to do it.

[0003] On the other hand, since the construction waste generated during the construction work is large in form and quantity, the waste disposal of such construction waste has become a major social problem. The flammable garbage was incinerated in an incinerator, and the ash and unburned residue after the incineration were usually disposed of by landfill.

For this reason, the following problems have been pointed out with respect to the incineration of combustible waste. Nitrogen oxide generated during combustion (hereinafter referred to as NO _x) air pollution, lack of landfill or the like for disposal of residual ash and burning remaining after incineration. Leakage of hazardous components in residual ash at landfill sites. The problem of producing and releasing harmful dioxins. If the incineration waste contains a large amount of high-calorie plastic waste, the temperature inside the furnace rises excessively when incinerated, exceeding the heat resistance limit of the furnace and causing damage to the incinerator itself. .

Conventionally, as a countermeasure for solving such a problem, for example, by burning under a low oxygen concentration and a method of suppressing _the amount of NO _x, the furnace temperature was like burning while sprinkling into the furnace A method has been adopted to control the temperature below a certain level to prevent damage to the incinerator due to temperature rise.There is also a method of insolubilizing residual ash containing harmful substances, solidifying cement, and then landfilling. It was being done.

Further, regarding plastic garbage bags which are incinerated together with combustible garbage, the use of translucent garbage bags containing a large amount of calcium carbonate in place of conventional garbage bags is obliged to reduce the amount of garbage. Some municipalities have been trying to reduce the amount of calories burned.

As for the separation of refuse, a method has been proposed in which a ferromagnetic fine powder is dispersed in a synthetic resin body to separate plastic waste by the action of magnetism (Japanese Patent Laid-Open No. 52-68247). As for the prevention of offensive odor, a method of suppressing odor in bags by adding titanium oxide, aluminum oxide, nickel oxide and iron oxide to polyethylene resin and polypropylene resin (Japanese Patent Application Laid-Open No. 3-212353) has been proposed. I have.

[0008] On the other hand, corner covers as construction waste generated during construction work must be soft and resilient in nature to prevent damage to columns, beams, fittings, furniture, and the like. There is no risk of damaging the pillars and the like, and it is necessary to be easy to fit when detached, not to come off, and to be inexpensive. For this reason, corner covers made of foamed polyolefin resin (especially made of foamed polyethylene resin) have become widespread. However, this kind of foamed polyolefin resin is mixed with the above-mentioned calcium carbonate, ferromagnetic fine powder, titanium oxide, aluminum oxide, nickel oxide, iron oxide, etc.
It has been extremely difficult to provide a function that takes into account the problem of garbage disposal.

For example, when a filler such as calcium carbonate is contained in polyethylene and foamed, there is no problem if the filler such as calcium carbonate is a small amount because it acts as a cell regulator. However, if they contain such an amount to exert their functions, there are problems that the cells become too fine and foam molding becomes difficult and that the mechanical strength decreases.

[0010]

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in incinerating conventional foam polyolefin resin corner covers which are produced in large quantities as construction wastes generated during construction work. It has high cushioning and elasticity and is easy to fit and hard to remove, but it is high under low temperature and low oxygen concentration conditions when incinerated with other garbage. It is an object of the present invention to provide a low-temperature and high-combustibility foamed polyolefin resin corner cover which exhibits combustion efficiency and can extremely reduce harmful substances such as residual ash after incineration or dioxin.

[0011]

Means adopted by the present inventor to solve the above-mentioned problem is a foamed polyolefin-based resin molded article having a embedment piece capable of embracing a corner of an object by a restoring elastic force. It is characterized by the fact that it contains hydrous ferric oxide particles or iron oxide particles in the composition of, and by retaining such iron oxides, the necessary buffering property and elasticity are maintained. A corner cover made of a polyolefin resin foam with low temperature and high flammability that exhibits efficient flammability under conditions of low temperature and low oxygen concentration, and that can extremely reduce the generation of residual ash and harmful substances. It was.

First, the molded article of the foamed polyolefin resin referred to in the present invention refers to a molded article of polyethylene, polypropylene or the like which has been kneaded with a gas, a low-boiling solvent or a decomposable foaming agent and extruded. Are preferred.

The hydrous ferric oxide particles in the present invention include goethite (α-FeOOH) particles, lipid closite (γ-FeOOH) particles, and δ-FeO
Any of the OH particles can be adopted, and the particle shape may be any of a spindle shape (bamboo leaf shape), a needle shape, a plate shape, and the like, but a spindle-shaped hydrous ferric oxide particle is particularly preferable in terms of combustion efficiency. .

The spindle-shaped hydrous ferric oxide particles used in the present invention are particles having an appearance in which a number of ultrafine fibers converge according to observation with an electron microscope, and have a major axis diameter of 0.05 to 1.5 μm.
Axial ratio (major axis diameter / minor axis diameter-below, same) 1 to 18, BET
The specific surface area is 30 to 250 m ² / g. In the present invention, from the viewpoint of combustion efficiency, the major axis diameter is preferably 0.1 to 0.5 μm, the axial ratio is 3 to 15, and the BET specific surface area is preferably 15 to 100 m ² / g.

The needle-shaped hydrous ferric oxide particles include not only particles in the form of needles, but also particles having a branch-like appearance in which dendrites have emerged from some parts of the needle-like particles, and have a major axis diameter of 0.05 to 2.0 μm.
m, the axial ratio is 2 to 20, and the BET specific surface area is 10 to 200.
m ² / g. Considering combustion efficiency, the long shaft diameter is 0.1
0.8 μm, the axial ratio is 5 to 15, and the BET specific surface area is
15~100 m ² / g is preferable.

According to observation with an electron microscope, the plate-like hydrous ferric oxide particles have a hexagonal plate-like or disk-like appearance, and have a plate surface diameter of 0.02 to 1.5 μm and a plate-like ratio (plate-like ratio). Surface diameter / thickness-the same applies hereinafter) of about 3 to 15. In consideration of combustion efficiency, the plate surface diameter is preferably 0.03 to 0.5 μm, and the plate ratio is preferably 5 to 10.

The hydrous ferric hydroxide particles of these various shapes can be added to a suspension containing a neutralization precipitate of an aqueous ferrous salt solution and an aqueous alkali hydroxide solution in the presence of an additive or in the presence of an additive. It can be produced from an aqueous solution by passing an oxygen-containing gas such as air in the presence.

The iron oxide particles used in the present invention include hematite (α-Fe ₂ O ₃ ) particles and magnetite (FeO
_{x · Fe 2 O 3, 0} <x ≦ 1) particles, also can use one of maghemite (γ-Fe ₂ O ₃₎ particles, particle shape fusiform, acicular, other plate, It may be any of so-called granular shapes having a substantially isotropic shape such as a sphere, an octahedron, a polyhedron, and an irregular shape, but granular magnetite particles are most preferable in terms of combustion efficiency.

Generally, the major axis diameter of the spindle-shaped iron oxide particles and the needle-shaped iron oxide particles is 0.03 to 1.0 μm, and the axial ratio is 2 to 12,
The BET specific surface area is 5 to ²⁰⁰ m2 / g. In consideration of combustion efficiency, the major axis diameter is preferably 0.05 to 0.3 μm, the axial ratio is 3 to 10, and the BET specific surface area is preferably ²⁰ to 100 m ² / g.

The average particle size of the ordinary granular iron oxide particles is 0.3.
03 ~ 1.0μm, but 0.05 ~ 0.5μ in consideration of combustion efficiency
μm is preferred.

In the present invention, the ferric hydroxide particles or the iron oxide particles to be contained in the polyethylene, or a mixture thereof, and the content thereof is 0.1 to 20.0 wt%. If it is less than 0.1 wt%, the effect of improving the combustion efficiency is insufficient, and if it exceeds 20.0 wt%, the strength is significantly reduced, which is not preferable. Therefore, in consideration of improving the combustion efficiency of the entire combustible waste in the incinerator while maintaining the mechanical strength, the content is preferably 0.5 to 10.0 wt%, more preferably 0.5 to 5.0 wt%.

The foamed polyethylene corner cover according to the present invention may contain, if necessary, other than the ferric hydroxide particles or the iron oxide particles or a mixture of these particles.
Conventionally known lubricants, anti-blocking agents, antioxidants, weathering agents, and various additives such as a coloring agent may be appropriately compounded,
Various inorganic fillers can be used in combination.

[0023]

First, the most important point in the present invention is that the ferric oxide particles or the iron oxide particles, or the mixture of these particles, also has a property as a pigment capable of imparting various colors. On the other hand, according to the findings of the present inventor, in the case of a foamed polyethylene corner cover containing these, excellent combustion efficiency is exhibited even under low temperature and low oxygen conditions, and residual ash after incineration is reduced. That is, it has decreased.

The inventor of the present invention considers the cause of the above-mentioned combustion phenomenon of the foamed polyolefin resin corner cover of the present invention as follows. First, the iron atoms on the surfaces of the ferric oxide particles and the iron oxide particles are stabilized by surface hydroxyl groups formed by dissociation and adsorption of water, but dehydration occurs between the surface hydroxyl groups due to heating in the combustion process, and coordination occurs. Unsaturated iron and oxygen ions are formed. Next, the coordinatively unsaturated active sites generated in this manner exhibit catalytic activity in a series of processes such as activation of oxygen by oxygen adsorption generated in the combustion process and dehydrogenation reaction from organic matter, and promote combustion. It is effective.

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a specific configuration of the present invention will be described in detail with reference to embodiments.

The corner cover made of foamed polyolefin resin (polyethylene resin) of the present embodiment, which is a specific application example of the present invention, is formed into a shape as shown in FIGS. The foamed polyethylene corner cover is prepared by mixing a polyethylene resin and 0.9 wt% of iron oxide (fused iron oxide hydroxide particles) for promoting combustion, supplying the mixture to an extruder, and melting and kneading the mixture. Butane as foaming gas is extruded from an injection die and cut into a predetermined length. The foamed polyethylene corner cover 1 shown in FIGS. 1 and 2 obtained by cutting is in a closed cell state having an expansion ratio of 20 times, and both edges are brought into contact with the inner surface of the central portion by restoring elasticity. The holding pieces 10.10 are provided with cylindrical (FIG. 1) or chevron (FIG. 2) ribs 10a and 10
a is formed. And the corner cover 1 of FIG.
At the substantially central portion of the outer surface, a cylindrical groove is formed along the longitudinal direction, and the groove is hardened to a semi-rigid state by pressing of a heating iron immediately after extrusion and forms an outer bending margin 11. Function is provided.

The present inventor conducted a test with the evaluation items of combustion efficiency, complete combustion rate, and low-temperature combustibility in order to verify the combustion performance of the foamed polyethylene corner cover of the above embodiment.

The burning rate was determined by weighing 10 mg from the above foamed polyethylene corner cover 1 and raising the temperature at a rate of 10 ° C./min in the air or under a low oxygen concentration (air / nitrogen = 1: 1) at 400 ml / min. Was measured by a thermogravimetric analyzer (manufactured by Seiko Denshi Kogyo Co., Ltd.) and the time required from the time when the rapid weight loss started to the time when the rapid weight loss ended was measured. Time (presumed that combustion is occurring during this time). Indicated by The preferred value of the burning rate in the present invention is 3.5 minutes or less in air, 4.0 minutes or less under low oxygen concentration, particularly preferably 3.0 minutes or less in air,
It is less than 3.5 minutes under low oxygen concentration.

The complete combustion rate (the larger the value, the smaller the amount of unburned residue and residual ash after incineration) is,
The weight loss rate (%) was calculated per flammable component at the end of the rapid weight loss. The preferred value of the complete combustion rate in the present invention is at least 90.0 wt% in air, at least 88.0 wt% under low oxygen concentration, and particularly preferably in air.
It is 93.0 wt% or more and 90.0 wt% or more under low oxygen concentration.

The low temperature flammability (the temperature at which the organic matter is required to be completely burned out) is indicated by the temperature at which the weight loss no longer occurs in the above measurement. Preferred values of the low-temperature flammability in the present invention are 520 ° C or less in air, 535 ° C or less under low oxygen concentration, and particularly preferably 490 ° C in air.
Below, it is 520 ° C or lower under low oxygen concentration.

[0031]

[Table 1]

For comparison, Table 2 also shows the properties of a corner cover made of polyethylene containing no combustion promoting iron oxide and having an expansion ratio of 20. In these comparisons, the center of the column was shaved, and the balance was arranged such that both ends of the scale had a gap of 50 mm and protruded 5 to 10 mm from the column surface.
A corner cover made of a foamed resin was attached so as to cover the scale, and the weight (load) indicated by the scale was measured together with the elapsed time.

[Table 2]

Further, a foamed resin corner cover according to the present embodiment was attached to a column that was vertically erected, and the distance of sliding down and the distance of coming off were measured over time. Table 3 below shows the measurement results. In addition, the code | symbol a in Table 3 shows sliding in the column cross direction, and code | symbol b shows sliding down in the column length direction.

[Table 3]

Although the product examples and specific test data of combustion efficiency, complete combustion rate, and low-temperature combustibility listed as the embodiments in this specification are as described above, the present invention is limited to the above-described embodiments. But not "claims"
Various component changes and form changes are possible within the description.

In the above-described embodiment, only an example in which 0.9 wt% of spindle-shaped hydrous ferric oxide particles is added as a combustion accelerator to the corner cover has been described. The required action can be achieved by adding the mixture of the above in a range of 0.1 to 20.0 wt%.
It goes without saying that these modifications fall within the technical scope of the present invention.

Also, in this embodiment, the corner cover is only an example of a substantially channel shape in FIG.
The shape is not necessarily limited to the channel shape as long as the corners of the object can be embraced by restoring elasticity, and the embraces 10 and 10 are folded into a flat state when not in use during storage and transportation. Such a shape change also belongs to the technical scope of the present invention.

[0037]

As described above, as verified by the embodiment product actually produced by applying the present invention and the test results on the performance of the product, the corner cover of the present invention has:
Since the content of combustion-promoting iron oxide is not mixed in so much, resin foaming is not hindered, and there is almost no decrease in mechanical strength as a foamed polyolefin resin molded product, and moderate rigidity , The grip force at the time of attachment to a corner portion of a pillar or the like is increased, and an effect of not being easily detached is obtained.

Furthermore, the corner cover made of a foamed polyolefin-based resin of the present invention can be used for its intended purpose, and even if it is incinerated with waste such as construction waste in an incinerator, it can act as a combustion-promoting agent. Since it contains diiron particles or iron oxide particles or a mixture thereof, NO _x
Low temperature, which is considered to be effective in controlling
Even when the incinerator is operated under a low oxygen concentration condition, there is an effect that the combustible waste is efficiently burned to reduce the generation of unburned ash and residual ash.

[0039] Further, the combustion catalysis combustion promoting iron oxide has originally reduced for _the amount of NO _x, with effects such as suppressing the formation of dioxin due to complete combustion of the combustible waste (organic matter) can be expected, the hydrous oxide Conventional insolubilization treatment by reducing the solubility of heavy iron in the residual ash in water by reacting ferrous particles or iron oxide particles or a mixture of these with metal oxides during incineration It can be expected that the effect can be reduced.

[Brief description of the drawings]

FIG. 1 is an explanatory perspective view of a corner cover made of a foamed polyethylene resin according to an embodiment of the present invention.

FIG. 2 is a perspective explanatory view showing another example of the shape of a foamed polyethylene resin corner cover manufactured by applying the present invention.

[Explanation of symbols]

 1 Corner cover 10 Embedding piece 10a Rib 11 Outside bending margin

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Tomokazu Yamazaki 2-1 32 characters, Kawasari-cho, Sabae-shi, Fukui F-term in Sakai Chemical Industry Co., Ltd. Sabae Factory 4F074 AA16 AC17 DA24 DA33 DA37 4J002 BB001 BB041 DE116 FA086 GC00 GL00

Claims (5)

[Claims] 1. A molded article of a foamed polyolefin-based resin having an embedding piece capable of embedding a corner portion of an object by a restoring elastic force, wherein the molded article is a ferric oxide-containing iron oxide particle or an iron oxide particle. A corner cover made of a foamed polyolefin-based resin having a low temperature and a high flammability, comprising a mixture. 2. A corner made of a foamed polyolefin-based resin having a low temperature and a high flammability according to claim 1, which contains 0.1 to 20.0 wt% of hydrous ferric oxide particles or iron oxide particles or a mixture thereof. cover. 3. The corner cover made of a foamed polyolefin-based resin of low temperature and high flammability according to claim 1, wherein the ferric oxide particles are spindle-shaped ferric oxide particles. 4. The low-temperature high-combustibility according to claim 1, wherein an outer bending margin is formed along a longitudinal direction at a substantially central portion of an outer surface of the foamed polyolefin resin molded article. Corner cover made of foamed polyolefin resin. 5. The method according to claim 1, wherein thick ribs are formed along the longitudinal direction at both ends of the holding piece of the foamed polyethylene molded article. ,
Corner cover made of foamed polyolefin resin with low temperature and high flammability.