JP2001240732A - Composite resin, manufacturing method thereof and composite resin pipe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sufficiently practical composite resin material having high impact resistance and moldability utilizing a PET resin which is contained in a PET bottle, etc., recovered from wastes. SOLUTION: A composite resin material comprises a PET resin as a material which is contained in a PET bottle, etc., recovered from wastes, including a polyolefin resin recovered from wastes, chopped strands of glass fibers and incinerated scattering ash discharged from an incinerating facility, and preferably it comprises 20-79 wt.% of the PET resin, 10-30 wt.% of the polyolefin resin, 5-30 wt.% of the chopped strands of glass fibers and 1-20 wt.% of the incinerated scattering ash.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a composite resin material and a method for producing the same, and more particularly, to PET recovered from waste.
The present invention relates to a composite resin material using a bottle or the like and a method for producing the same. The present invention also relates to a composite resin pipe formed from such a composite resin material, particularly to a drainage pipe and a structural member having a predetermined cross section.

[0002]

2. Description of the Related Art Reinforced concrete, vinyl chloride, and porcelain pipes are mainly used as drainage pipes for sewage and the like, and pipes made of these materials account for about 85% or more of the whole. Among these pipes, reinforced concrete pipes are subject to cracks, abrasion, and corrosion due to aging, resulting in an increase in pipe flow resistance,
Water leakage, intrusion of water, deterioration of earthquake resistance, breakage, etc. will occur. For this reason, replacement of pipes and large-scale repair work are required.

[0003] Further, in the case of a pipe made of vinyl chloride, chlorine gas is generated due to decomposition of a molten resin material during molding, and this chlorine gas corrodes a molding machine and a mold, and is discarded. There is a problem that highly toxic dioxin is generated when incinerating vinyl chloride pipes. Furthermore, a pipe made of vinyl chloride has low cold resistance, and when a vinyl chloride pipe is used in a cold region, there is a problem that the pipe is cracked.

[0004] Incidentally, so-called PET bottles made of polyethylene terephthalate (PET) are currently widely used mainly for beverage containers and the like. This PE
The production volume of T bottles has now reached about 320,000 tons / year, of which more than 60,000 tons / year are recovered to utilize resources. Various researches and developments have been made on recycled plastics made from recycled PET bottles in various fields. For example, they are processed into fibers for clothing, or molded into sheets for use. Has been put to practical use. However, there is a problem that a small amount of foreign matter may impair fiber processing, and there has not yet been developed a product which can be recycled in large quantities.

Here, it is conceivable to form a drainage pipe using the PET resin contained in the recovered PET bottle as a raw material. Generally, when a pipe (in the case of a straight pipe) is molded, extrusion is performed from the viewpoint of cost and production efficiency. However, even when the pipe is molded from a PET resin as a raw material, the PET resin is kept at a predetermined temperature. (About 270 ° C)
To melt and extrude. However, PET resins have not been put to practical use yet because they have a problem that the viscosity at the time of heating and melting is extremely small and they are not suitable for extrusion molding.

In addition, when a thick wall such as a pipe is formed by extrusion molding, if a PET resin is used, a difference occurs between the cooling speed of the pipe surface and the cooling rate of the inside of the pipe in the process of solidifying the molten resin. In other words, the surface of the PET resin becomes a transparent amorphous layer because the cooling rate is high and passes through the crystallization temperature zone in a short time, while the inside of the PET resin stays in the crystallization temperature zone and thus has a milky white crystalline layer. And the shrinkage ratio becomes larger than that of the amorphous layer. For this reason, when the molded article is used for a long period of time, there is a problem that an internal crack is generated near the boundary between the surface and the interior, and the impact resistance is reduced.

On the other hand, incineration facilities for incineration of garbage and sewage sludge generate a large amount of fly ash, and this fly ash is used as a cement raw material, asphalt filler for roads and as a filler for concrete products. Although some of them are implemented, most of them are landfilled. But,
When incinerated fly ash is landfilled, there is a risk that harmful components contained in the incinerated fly ash may elute. In addition, problems such as a shortage of landfills for incinerated fly ash have also arisen.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems of the prior art, and has high impact resistance and moldability by using PET resin recovered from waste. Another object of the present invention is to provide a sufficiently practical composite resin material. Another object of the present invention is to provide a method for producing such a composite resin material. Still another object of the present invention is to provide a composite resin pipe formed from such a composite resin material.

[0009]

SUMMARY OF THE INVENTION In order to solve the problems in the prior art, the present invention relates to a composite resin material made from PET resin contained in PET bottles and the like recovered from waste. And polyolefin-based resin recovered from waste, chopped strands of glass fiber, and incineration fly ash discharged from an incineration facility. Preferably, the composition contains 20 to 79% by weight of PET resin, 10 to 30% by weight of polyolefin resin, 5 to 30% by weight of glass fiber chopped strand, and 1 to 20% by weight of incinerated fly ash.

[0010] As described above, a molded article using only PET resin as a raw material has a small Labo Plastomill test value (shear torque), which is a measure of viscosity during extrusion molding by heating and melting, and has low moldability. In addition, the impact resistance tends to decrease due to the non-uniform crystallization. However, by mixing a polyolefin resin, such as a PET bottle cap or a handle resin, into a PET resin to form a composite resin pipe, the polyolefin resin component enters the molecules of the PET resin. As the viscosity at the time increases, the bonding performance also improves. Thereby, the extrudability is improved.

A molded article made of only PET resin has very low Izod impact value, and thus has almost no application. However, a molded resin pipe is formed by mixing a chopped strand of glass fiber into PET resin. ,
The impact resistance is significantly improved. At the same time, the viscosity at the time of extrusion can be increased, so that the extrudability is improved. Furthermore, since the shrinkage rate during molding is significantly suppressed, it is possible to prevent the male mold (mandrel) from being entangled during extrusion molding, and to significantly improve the dimensional stability of the molded product. Can be.

Furthermore, by mixing incineration fly ash with the PET resin to form a composite resin pipe, fine incineration fly ash particles function as a nucleating agent, and crystallization of the PET resin is promoted. In addition, it is possible to obtain a uniform molded product, and it is possible to remarkably improve physical properties and appearance. At the same time, the viscosity at the time of extrusion molding by heating and melting also increases, so that the extrudability can be improved. Here, the harmful components of the incineration fly ash are safe because they are not sealed and eluted by the resin, and the treatment of the incineration fly ash and the reuse of the PET bottles and the like can be performed at the same time. In general, incinerated fly ash of sewage sludge contains less harmful substances and is more stable in quality than incinerated fly ash of garbage. Therefore, it is preferable to use incinerated fly ash of sewage sludge.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, one embodiment of a composite resin material (particularly, a composite resin pipe) and a method for producing the same according to the present invention will be described in detail. In the production of the composite resin material according to the present invention, as the main raw materials, the PET resin contained in the recovered PET bottle, the polyolefin-based resin contained in the cap or handle of the PET bottle, and the chopped strand of glass fiber Use incineration fly ash discharged from incineration facilities. The incineration fly ash used has a water content of 0.01% or less after drying. These raw materials are preferably 20 to 79% by weight of PET resin, preferably 10 to 30% by weight of polyolefin resin, preferably 5 to 30% by weight of chopped strand of glass fiber, and preferably 1 to 30% by weight of incinerated fly ash. Contains 20% by weight.

As a first embodiment, 64% by weight of a PET resin, 16% by weight of a polyolefin resin, 15% by weight of glass fiber, and 5% by weight of incinerated fly ash are mixed and heated and melted. Was molded. Further, as a second embodiment, after mixing and heating and melting 64% by weight of PET resin, 16% by weight of polyolefin-based resin, 10% by weight of glass fiber, and 10% by weight of incinerated fly ash, a composite resin pipe was formed. Molded. The molded composite resin material was cut into a predetermined shape and size to prepare test pieces, and each test piece was subjected to various physical property tests (tensile strength test, flexural strength test, Izod impact strength test) and lab plast mill test. Table 1 shows the test results.

[0015]

[Table 1]

Table 1 shows, as comparative values, the test results of a sample using only PET resin as a raw material, that is, a sample containing 100% by weight of PET resin. The test results of those containing 100% by weight of a commercially available high-density polyethylene (HDPE) resin and those containing 100% by weight of a vinyl chloride (PVC) resin are shown as reference values. As can be seen from Table 1, those containing 100% by weight of PET resin (comparative value)
Has an impact resistance (Izod impact strength) of 28.4 J /
m, and the shearing torque is as low as 6.7 N, which indicates that it is not suitable for extrusion molding as described above. This PET resin is originally a kind of engineering plastic, and is generally known to have higher physical properties than general-purpose resins. On the other hand, it can be seen that the physical properties of the composite resin in Examples 1 and 2 are well-balanced, and in Example 2, although the shear torque is slightly low, practically sufficient physical properties are obtained. The general-purpose resin HD
100% by weight of PE resin and 10% of PVC resin
Those containing 0% by weight (reference values) have good properties in tensile strength and bending strength, and are widely used as drainage pipes for extrusion molding.

[0017]

As described above, according to the present invention,
Polyolefin resin using waste as PET resin,
By mixing chopped strands and incinerated fly ash of glass fiber, the viscosity at the time of extrusion molding can be increased and the bonding performance can be improved, and the extrudability can be greatly improved. Further, a composite resin having a uniform crystallinity can be obtained, and the impact resistance can be improved. Therefore, a sufficiently practical drain pipe, for example, a drain pipe used for sewage or the like can be formed using such a composite resin. Also, because the impact resistance is improved,
For example, when the pipe is buried underground, it can withstand an earthquake, a road surface load when driving a car, vibration, and the like.

Furthermore, the main components are PET resin and polyolefin resin using waste, and the material cost can be reduced compared to other molded products, so that the pipe can be manufactured at low cost. In addition, since the main component of the composite resin is PET resin, it can be lighter in weight than reinforced concrete pipes and the like, thereby making it possible to reduce costs required for pipe transportation and burial work. .

A pipe formed of such a composite resin has high chemical resistance, so that, for example, even when used in a sewer pipe, corrosive components, gases, etc.
Strong against fungi. In addition, since it is resistant to corrosion and abrasion, the smoothness of the flowing water surface is not easily changed over time, and it is difficult for dirt to adhere thereto, so that the initial flow characteristics can be maintained for many years. Also,
Since complete joining with an adhesive is possible, efficiency of on-site work, perfect watertightness can be maintained, and repair is easy. Furthermore, since it is excellent in cold resistance and hardly generates a crack like a vinyl chloride pipe, it can withstand long-term use in a cold region.

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Claims (5)

[Claims] 1. A composite resin material made of polyethylene terephthalate resin (PET resin) contained in a polyethylene terephthalate container (PET bottle or the like) recovered from waste, wherein the polyolefin resin recovered from waste is A composite resin material comprising: glass fiber chopped strands; and incinerated fly ash discharged from an incineration facility. 2. The composition contains 20 to 79% by weight of the PET resin, 10 to 30% by weight of the polyolefin resin, 5 to 30% by weight of the glass fiber chopped strand, and 1 to 20% by weight of the incinerated fly ash. The composite resin material according to claim 1, wherein: 3. The composite resin material according to claim 1, wherein the moisture content of the incinerated fly ash after drying is 0.01% or less. 4. A method for producing a composite resin material using a PET resin contained in a PET bottle or the like recovered from waste as a raw material, wherein the PET resin includes a polyolefin resin recovered from waste and glass. A composite resin material is formed by mixing chopped strands of fiber and incinerated fly ash discharged from an incineration facility and having a moisture content of 0.01% or less after drying, and heating and melting the mixture to form a composite resin material. Manufacturing method of composite resin material. 5. A composite resin pipe formed from the composite resin material according to any one of claims 1 to 3.