JP4625190B2 - Recyclable rigid foam resin body - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention makes it easy to recycle or reuse hard foamed resin bodies mainly used as building materials.
[0002]
[Prior art]
Hard foamed resin waste generated by cutting, etc. in construction work, or generated by dismantling, etc., has been recycled as a very small amount of fuel, but almost all of it is finally disposed of as buried. Yes.
[0003]
[Problems to be solved by the invention]
However, from the viewpoint of increasing environmental problems, waste is required to be recycled and reused as much as possible. Rigid foamed resin is lightweight, easy to handle, and has excellent heat insulation properties, so it is widely used for building materials. However, the waste is only disposed of as landfills and is effectively recycled. There is almost no reuse.
[0004]
[Means for Solving the Invention]
In the present invention, thermoplastic resin pellets are mixed in advance in a hard foamed resin so that it can be easily recycled and reused when it becomes building waste.
[0005]
Embodiment
The hard foamed resin used in the present invention is mainly used as a building material such as hard phenol foam, hard urethane foam, and hard isocyanurate foam, but is not limited to building materials.
[0006]
The thermoplastic resin used in the present invention is, for example, polyethylene, polypropylene, polystyrene, polyvinyl chloride or the like, and the pellet is particularly preferably one having a side length or diameter of about 1 to 10 mm. The pellet may be subjected to a surface treatment as necessary. Moreover, the thermoplastic resin pellet mixed in the hard foamed resin may be a single type or a combination of a plurality of types, and the mixing ratio is preferably about 20 to 70% by weight.
[0007]
In order to mix the thermoplastic resin pellets into the hard foamed resin, before the resin body is formed, for example, mix with the undiluted solution before the reaction, spread the undiluted solution on the substrate, spread the undiluted solution from the top, etc. There is a way.
[0008]
When thermoplastic resin pellets are mixed in a hard foamed resin with a low expansion ratio, the thermoplastic resin pellets function as aggregates and fillers, and the physical properties of the hard foamed resin body can be enhanced to expand the range of use as building materials. . Conversely, when thermoplastic resin pellets are mixed in a hard foamed resin having a high expansion ratio, the specific gravity slightly increases, but does not hinder other functions of the hard foamed resin.
[0009]
When used as a building material, there are methods such as using a rigid foamed resin body mixed with thermoplastic resin pellets alone, integrating with a substrate, and combining with a packing material or the like. Examples of the substrate include a steel plate, an aluminum plate, a stainless plate, a plywood, a paper, a film, and the like, and adhesion to the hard foamed resin body is due to self-adhesion of the hard foamed resin, or an adhesive or an adhesive tape.
[0010]
Next, recycling and reuse of the hard foamed resin body that has become building waste will be described.
[0011]
First, the hard foamed resin body is separated, cut or crushed. The size by crushing or cutting does not need to be particularly small, and may be any size as long as it can enter the inlet of a kneader or an extruder to be used later.
[0012]
Next, the hard foamed resin body is put into an extruder or a kneader. If the mixing ratio of the thermoplastic resin pellets is 50% by weight or more, it is put into the extruder, and if it is 50% by weight or less, the pressure-type kneading is performed. The efficiency is better when it is put into the machine. In the process of extrusion or kneading, the hard foam resin that has been added functions as an aggregate or filler, and the thermoplastic resin pellets function as a binder. Will be. The recycled product is in the form of a preformed product or final molded product such as a pellet, ribbon, or sheet. In the above step, a recycled product can be obtained without adding a compounding agent or the like, but it may be added as necessary.
[0013]
Furthermore, when adding a rigid foamed resin body to an extruder or kneader, the mixing ratio can be changed by adding the same or different type of thermoplastic resin pellets. It is also possible to change the properties of recycled products.
[0014]
Of course, when the rigid foamed resin body is introduced, pigments, talc, flame retardants, other additives, and the like can be added as necessary. In addition, by crushing and adding waste such as tiles and pottery, effects such as increasing the hardness of the recycled product can be obtained.
[0015]
(Example)
FIG. 1 shows a panel A composed of a rigid foamed resin body mixed with thermoplastic resin pellets and a steel plate obtained in this example. 1 is a hard phenol foam, 2 is a polyethylene pellet, and 3 is a steel plate. A manufacturing method will be described below.
[0016]
After adding a foaming agent, a curing agent, etc. to the phenol stock solution and premixing, add a pellet of polyethylene of about 3 mm in diameter x about 5 mm in length, mix and spray on the steel plate to be the substrate, and then place the steel plate, Panel A having a thickness of 25 mm was obtained by heating and pressurizing using a mold. The mixing ratio was 90 parts by weight of pellets with respect to 100 parts by weight of hard phenol foam.
The mixing volume ratio in the obtained panel A is about 5 parts by volume of pellets with respect to 100 parts by volume of the phenol foam body.
For comparison, Panel B of the same size was obtained using the same amount of the phenol stock solution and the front and back surfaces of which were steel plates. The expansion ratio of the phenol foam of panel B is about 20 times, and it is a panel excellent in fireproof performance and heat insulation performance.
[0017]
In order to compare the thermal insulation performance of panel A and panel B, when measuring the thermal conductivity, board A is 1.01 kcal / m ² h ° C and board B is 0.96 kcal / m ² h ° C. Excellent heat insulation performance.
[0018]
Next, the hard foamed resin body was taken out from the panel A, cut into a size that could be put into the inlet of the extruder, put into a screw type extruder, and a substantially L-shaped angle was obtained through a die. This angle has a configuration in which phenol powder is bound with polyethylene, is light and strong, and is easy to nail.
[0019]
【The invention's effect】
According to the present invention, (1) when pellets are mixed with a hard foamed resin having a low expansion ratio, various physical properties are improved, and the range of use of conventional hard foamed resin bodies can be expanded. (2) When pellets are mixed in a hard foam resin having a high expansion ratio, the function of the hard foam resin is not impaired. (3) Since resin pellets are used, the surface is smooth and does not interfere with the reaction of the hard foamed resin. (4) Since the pellets are made of thermoplastic resin, pre-molded products and molded products can be obtained even if they are put into an extruder or kneader without adding a binder to the hard foamed resin body that has become waste. And reuse is easy. (5) Since the pellets are dispersed in the hard foamed resin body, kneading is easy and efficient. (6) When a rigid foamed resin is put into an extruder or kneader, the same or different types of thermoplastic resin pellets can be added. It is also possible to change (design) the properties of. The characteristic effects such as are obtained.
[Brief description of the drawings]
FIG. 1 is a perspective view showing an embodiment of a panel using a hard resin foam according to the present invention.
[Explanation of symbols]
1 Hard phenol foam 2 Polyethylene pellet 3 Steel A Panel

Claims (1)

A rigid foamed resin body characterized by mixing thermoplastic resin pellets in a rigid foamed resin, which can be easily recycled or reused when it becomes waste.

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