JPS6020406B2 - resin composition - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a composition comprising a pulverized product of a molded article of a polyolefin resin.

Methods for recycling plastic molded product waste include heat-melting recycling, which involves heating and melting the waste and pouring it into a mold, recovery of oil through thermal decomposition, which is mainly applied to polyolefin resins, and recycling by dissolving in a solvent. A dissolution method using this as an asphalt modifier is known.

All of these methods target plastic waste made of thermoplastic resins, and the current situation is that there is no effective recycling method for thermosetting resin molded products, especially fiber-reinforced plastics. Also, in the heat melt regeneration method of thermoplastic resin molded products, the molded products shrink and deform significantly.
The disadvantage is that the rigidity of the material decreases.

In view of the above points, as a result of various studies, this invention was made by adding a crushed product of a fiber-reinforced plastic molded product made of a thermosetting resin to a crushed product of a polyolefin resin molded product. This invention was made based on the discovery that the shrinkage, deformation, and deterioration of physical properties of molded products caused by the hot melt regeneration method can be significantly improved, and that various molding methods can be employed.

The gist of the invention resides in a composition characterized in that 100 parts by weight of a pulverized polyolefin resin molded product contains 20 to 40 parts by weight of a fiber-reinforced plastic molded product made of a thermosetting resin.

Therefore, the composition of the present invention can be supplied to various molding machines such as an extrusion molding machine or an injection molding machine in a mixed state of the two pulverized products, or it can be melted and pelletized and then supplied to form a predetermined shape. The degree of pulverization at this time is determined appropriately depending on the molding method employed, but for example, when extrusion molding or injection molding is used,
It is preferable to crush the powder to 5 ml or less.

In addition, if the crushed product of a fiber-reinforced plastic molded product made of a thermosetting resin exceeds 40 parts by weight per 100 parts by weight of the crushed product of a polyolefin resin molded product, the fiber-reinforced plastic molded product made of a thermosetting resin There is not enough polyolefin resin to bond the pulverized products together, making it impossible to obtain a molded product with sufficient strength. The reinforcing effect of the crushed product is not sufficient, and the resulting product is easy to manipulate, making it difficult to obtain a sufficient product.

Therefore, in the present invention, 100 parts by weight of a pulverized polyolefin resin molded product contains 20 to 40 parts by weight of a pulverized fiber-reinforced plastic molded product made of a thermosetting resin. Incidentally, when a thermoplastic resin other than a polyolefin resin is mixed, if the mixing rate is small, the physical properties will not deteriorate much, so a small amount may be mixed.

The composition of the present invention can be formed into plate-shaped bodies, tubular bodies, and various other shapes by applying molding methods such as press molding, extrusion molding, and injection molding. Because of its excellent properties, the molded products can be used for a variety of purposes, and can be used not only for waste of polyolefin resin molded products, but also for waste of fiber-reinforced plastic molded products made of thermosetting resin, which has traditionally been relatively difficult to recycle. can also be used effectively. Examples of the molding composition of the present invention will be described below. Example 1 6 parts by weight of a pulverized product of a fiber-reinforced plastic molded product made of a thermosetting resin was added to 4 parts by weight of a pulverized product of a polyethylene molded product and a polypropylene molded product, respectively, and heated to form a plate-shaped molded product by a press molding method. As a result of measuring the physical properties of the obtained product, it was found that it had excellent compressive strength and bending strength as shown in Table 1, and could be used for various purposes.

On the other hand, plate-shaped molded products obtained by mixing other wastes such as foundry waste sand, sludge, crushed products of phenolic resin molded products, lightweight bone shoulders, etc. into the crushed products of polyolefin resin molded products are As shown in Table 1, the physical properties (compressive strength, bending strength) are inferior to molded articles made of the composition of the present invention.

Table 1 Example 2 Parts by weight of a polyethylene molded product 5 crushed to a size of 2 to 5 ribs and 50 parts by weight of a fiber-reinforced plastic molded product made of a thermosetting resin crushed to a size of 3 ribs or less. When mixing and using a 65 side single screw pent type extruder with a pipe mold attached to the tip, the inner diameter side was 57,
It was possible to continuously manufacture pipes with an outer diameter of 62 legs, and extrusion molding was possible.

The obtained pipe had a good appearance, and the fan strength of the pipe cut to a length of 5 mm was 350 k9/m, and it could be used as a buried pipe for drainage and water supply.

Example 3 A mixture similar to Example 2 was heated to 160 qo, mixed in a kneader for 10 minutes, then formed into a flat plate with a press, and a pellet with 3 elevation angles was produced using a beletizer.

Using this pellet, a socket-type pipe joint for connecting a 10-board pipe was manufactured using a 60-ounce injection molding machine, and it was found that it was injection moldable and had a good appearance, similar to the pipe in Example 2. It showed excellent strength.

Example 4 A mixture of 60 parts by weight of a pulverized molded product made of low-density polyethylene and 4 parts by weight of a pulverized fiber-reinforced plastic molded product made of a thermosetting resin was preheated and a plate-shaped body was formed by a press molding method. A test piece with a width of 7 feet, a length of 10 feet, and a thickness of 3 feet was prepared.

Two pieces of this test piece were wrapped in a 20-skin length range from the end, and that part was glued with a modified epoxy adhesive, and the test piece was pulled parallel to measure the scale adhesion strength, which was 11.4.
It was 9k9/. The adhesive surface of the test piece was sanded in advance, and the tensile test was performed using an Instron type tensile tester at a speed of 1 side/min, and the average of the six test values was taken as the forced adhesive strength. The same machine made of 40 parts by weight of a pulverized polyethylene molded product and 60 parts by weight of a pulverized fiber-reinforced plastic molded product made of thermosetting resin weighed 14.43k9.For comparison, a low-density polyethylene molded product Similarly, the deep adhesion strength of molded products molded from a mixture of pulverized low-density polyethylene molded product 6 parts by weight and cinnabar sand 4 parts by weight was 5, respectively.
．． It was 85k9/en, 6.31kg/.

Claims (1)

[Claims] 1. A resin composition characterized in that 100 parts by weight of a pulverized polyolefin resin molded product contains 20 to 400 parts by weight of a pulverized fiber-reinforced plastic molded product made of a thermosetting resin.