JPH04290588A - Method for recycling thermosetting resin waste containing silica filler and regenerated tile - Google Patents

Abstract

PURPOSE:To obtain the regenerated tile having elasticity, water permeability and electrolytic corrosion resistance by crushing thermosetting resin waste contg. silica particles of >=99% purity generated in the production of semiconductors, etc., as fillers to chips, adding liquid rubber thereto and subjecting the chips to pressurized molding under heating. CONSTITUTION:The thermoplastic resin waste contg. the silica particles of >=99% purity is cut and crushed by, for example, a crusher of a cutter type. The liquid rubber is added as a binder thereto preferably at <=10wt.% and is mixed with a mixer. The resulted semifluid mixture is put into metallic molds and is molded for 1 to 30 minutes under 5 to 50kg/cm<2> and at 100 to 400 deg.C, by which the regenerated tile is obtd.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention relates to a method for recycling thermosetting resin waste containing silica particles with a purity of 99% or more as a filler, and tiles made from such waste.
That is, regarding reproduction tiles.

0002

[Prior Art] In the treatment of plastic waste, since thermoplastic resin waste easily melts when heated, a technology has been developed for reusing thermoplastic resin waste by remolding it into various molded products by heating and melting it. However, since thermosetting resin waste does not melt when heated, it is actually difficult to reuse it.

Conventionally, for the purpose of reusing thermosetting resins, the cured resins have been solubilized by acid decomposition reactions to obtain recycled resins. "Solution and reuse as molding materials", Thermosetting Resins, Vol. 4, No. 2. 63rd~
68 pages, 1983.

[0004] However, there is no known technique for processing thermosetting resin waste at low cost and obtaining recycled products of good quality.

In particular, thermosetting resin waste such as epoxy resin containing 99% or higher purity silica as a filler, which is generated in large quantities from semiconductor manufacturing, etc., has silica particles with an average particle size of 5 to 100 microns. Due to its high hardness, it causes severe wear on containers etc. when chipped and mixed, making it extremely difficult to reuse by remolding, and conventionally most of it is disposed of by landfilling, incineration, etc. However, all of the conventional treatment methods are considered to be accompanied by problems in terms of cost, environment, etc., and cannot be said to be preferable methods.

[0006]

SUMMARY OF THE INVENTION The object of the present invention is to reuse thermosetting resin waste that does not melt when heated and contains silica particles with a purity of 99% or more as a filler. The present invention provides a reuse method for processing thermosetting resin waste, which has conventionally been disposed of in landfills, at a low cost and producing high value-added recycled tiles with desired material properties and external shape, and The aim is to provide high-quality recycled tiles made from recycled waste. In the present invention, thermosetting resin waste containing silica filler with high hardness, which is generated in large quantities from semiconductor manufacturing, etc., is recycled, and re-tiled tiles with various material properties and predetermined external shapes are produced by various molding conditions. is obtained. The recycled tiles obtained according to the invention are, for example, tiles such as interlocking blocks for pedestrian roads, earthquake-resistant and galvanic corrosion-resistant access floor blocks, etc.

[0007]

SUMMARY OF THE INVENTION The present invention resides in a method of recycling thermosetting resin waste containing silica particles with a purity of 99% or higher. The method of the present invention involves crushing waste into chips, mixing liquid rubber such as urethane rubber as a binder with the chipped waste, and heating and press-molding the mixture of the chipped waste and liquid rubber. to produce a recycled tile having resilience, water permeability, galvanic corrosion resistance, and a predetermined profile.

[0008] In the present invention, the step of making a chip is as follows:
For example, this is a process of cutting and crushing waste into particles of appropriate size using a cutter type crusher. This cutting and crushing allows the waste to be mixed with a binder or auxiliary raw materials in a short time using a simple mixer.

[0009] By using liquid rubber as a binder, the heating and pressing process can be carried out in a short time using a conventional hot press, thereby increasing the operating efficiency of manufacturing equipment and lowering the manufacturing cost of recycled tiles. be able to. Furthermore, the use of liquid rubber can be expected to impart desirable properties such as elasticity or flexibility, water permeability, and resistance to galvanic corrosion to recycled tiles, thereby increasing the added value of recycled tiles and stimulating demand.

Most of the thermosetting resin waste used as the main raw material for the tiles of the present invention has an average particle size of 5 to 100.
It contains 70% by weight or more of micron silica particles as a filler, that is, it is generated in large quantities during semiconductor manufacturing.

[0011] The mixing ratio of liquid rubber as a binder is:
Preferably it is 10% by weight or less. In the present invention, heating and pressure molding is performed using a hot press at a pressure of 50 kg, for example.
/cm2~5kg/cm2, temperature 400℃~100℃,
This is done for a time of about 30 minutes to 10 seconds, preferably 30 minutes to 1 minute.

The present invention also resides in recycled tiles manufactured by recycling thermoset resin waste. The molded product of the present invention is made by mixing crushed chips of thermosetting resin waste containing silica particles with a purity of 99% or more and liquid rubber and molding the mixture under heat and pressure. It is a tile that has a certain shape and a predetermined external shape.

[0013] In the recycled tile of the present invention, most of the recycled thermosetting resin waste has an average particle size of 5 to 5.
It contains 70% by weight or more of 100 micron silica particles as a filler. Further, preferably, the mixing rate of liquid rubber is 10% by weight or less.

According to the method of the present invention, no harmful smoke is emitted unlike incineration, the operating efficiency of the molding equipment is high, and the manufacturing cost of recycled tiles can be reduced. The recycled tiles of the present invention also have desirable properties such as resilience or flexibility, water permeability, and resistance to galvanic corrosion.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Examples of the present invention will be described with reference to the drawings. Figure 1 shows purity 9, which is generated in large quantities during the semiconductor manufacturing process.
1 is a schematic diagram illustrating a cutter-type crusher 2 used for cutting and crushing thermosetting resin waste containing 9% or more of silica particles as filler into crushed chips; FIG. In the crusher 2 of FIG. 1, a rotary blade 16 is arranged below the hopper 12. The rotary blade 16 is supported by a base plate 20 and driven by a motor 18 about a vertical axis.
Rotationally driven by.

Thermosetting resin waste containing silica particles with a purity of 99% or more as a filler is supplied from the hopper 12 onto the rotary blade 14, and is cut and crushed by the rotary blade 14 which is driven to rotate. Waste that has been cut and crushed into chips of a predetermined size or less, for example, chips with a maximum length of 10 mm or less, passes through the mesh of the screen 16 and exits at the outlet 17.
is discharged from. The waste that does not pass through the screen 16 is retained near the rotary blade 14 and is further cut and crushed by the rotary blade 14.

FIG. 2 is a schematic view schematically showing a mixer 4 for mixing waste chips, liquid rubber such as urethane rubber as a binder, and other auxiliary raw materials. The mixer 4 in FIG. 2 includes a main raw material hopper 22 that can stock the main raw material, an auxiliary raw material hopper 24 that can stock the auxiliary raw material that performs functions such as adjusting the elasticity of the molded product,
A binder hopper 26 capable of stocking liquid rubber as a binder, each rotary valve 23, 25, 27, a main raw material feeder 28, an auxiliary raw material feeder 30, a binder feeder 32, and each material are sent together to the mixing section 36. A mixer base plate 38 is provided to support a guiding funnel 34, a mixing section 36, and the like. The mixing section 36 may be of a simple type.

The cut, crushed, and chipped waste is metered from the main raw material hopper 22 via the rotary valve 23 and supplied to the funnel 34. The auxiliary raw material placed in the auxiliary raw material hopper 24 is measured from the auxiliary raw material hopper 24 via a rotary valve 30 and guided to a funnel 34.

Liquid rubber as a binder stored in the binder hopper 26 is metered from the hopper 26 via a rotary valve 32 and guided to a funnel 34.

The chipped waste, liquid rubber, and other auxiliary raw materials supplied from the funnel 34 to the mixing section 36 are sufficiently mixed in the mixing section 36 to form a semi-fluid mixture.

FIG. 3 is a schematic diagram illustrating a hot press 6 for heating and pressing the above-mentioned mixture. The hot press 6 is capable of pressurizing a mold 44 consisting of an upper mold and a lower mold disposed on a ram 46 between the ram 46 and a bed 48 using hydraulic pressure, and at the same time electrically heating the mold 44 . The mixture consisting of the waste that has been cut and crushed into chips, liquid rubber, auxiliary raw materials, etc. is poured between the upper mold and the lower mold of the mold 44,
Pressure 50kg/cm2 to 5kg/cm2, temperature 400℃
Molding is performed at ~100°C for 30 minutes to 1 minute. By using liquid rubber as the binder, the molding time can be made relatively short, the operating efficiency of the equipment can be increased, and the manufacturing cost can be reduced.

After being molded by the hot press 6, the recycled tile of the molded product is automatically taken out and cooled.

In this way, thermosetting resin waste containing a hard silica particle filler that does not melt when heated can be processed at low cost to produce recycled tiles with high added value and having desired material properties and external shape. can be manufactured.

The method of the present invention involves crushing thermosetting resin waste into chips, mixing liquid rubber as a binder with the chipped waste, and heating the mixture of the chipped waste and liquid rubber. Pressure molding to produce recycled tiles having resilience, water permeability, galvanic corrosion resistance, and a predetermined profile. In the present invention, the chipping step can be performed using a simple type of mixer.

[0025] By using liquid rubber as a binder, the heating and pressing process can be carried out in a short time using a conventional hot press, thereby increasing the operating efficiency of manufacturing equipment and lowering the manufacturing cost of recycled tiles. be able to. The use of liquid rubber also imparts desirable properties to the molded article, such as resiliency or flexibility, water permeability, and resistance to galvanic corrosion.

[0026] Since the recycled tiles obtained by the present invention have elasticity or flexibility, water permeability, and resistance to electrolytic corrosion, they can be laid on roads to form a road surface with elasticity suitable for jogging, etc. Can be done. The recycled tiles of the present invention can also be laid on the floor of a children's play area to give the floor resilience and make the play area safer. Furthermore, the recycled tile of the present invention is
It is suitable for the floor of a computer room because it has galvanic corrosion resistance, is constructed into a floor, has earthquake resistance, and absorbs floor vibrations. As described above, according to the present invention, thermosetting resin waste that does not melt when heated and contains hard silica particles as a filler, which was previously difficult to reuse, can be reused, and it can be added at low cost. We can provide recycled tiles that have high value and are expected to be in demand in the market.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram illustrating a cutter type crusher for cutting and crushing thermosetting resin waste into crushed chips.

FIG. 2 is a schematic diagram illustrating a mixer for mixing waste chips, liquid rubber as a binder, and auxiliary raw materials.

FIG. 3 is a schematic diagram illustrating a hot press 6 that heats and presses a mixture of waste chips, liquid rubber, and auxiliary raw materials.

[Explanation of symbols]

2　Crushing machine 4 Mixer 6 Hot press 14 Rotating blade 16 Screen 18 Motor 22 Main raw material hopper 24 Hopper for auxiliary raw materials 26 Hopper for binder 28 Main raw material feeder 30 Feeder for auxiliary raw materials 32 Binder feeder 34 Funnel 36 Mixing section 44 Mold

Claims (3)

[Claims] Claim 1: A method of recycling thermosetting resin waste containing silica particles with a purity of 99% or more as a filler, the waste is crushed into chips, and the chipped waste is injected with liquid as a binder. A recycled tile having elasticity, water permeability, resistance to galvanic corrosion, and a predetermined external shape is produced by mixing rubber and heating and press-molding a mixture of chipped waste and liquid rubber. Method. 2. In the method according to claim 1, the heating and pressure molding is performed using a hot press at a pressure of 50 to 5 kg/min.
cm2, a temperature of 400 to 100°C, and a time of 30 minutes to 1 minute. 3. The main raw material is chips of thermosetting resin waste containing silica particles with a purity of 99% or more as a filler, and a mixture of the main raw material and 10% by weight or less of liquid rubber as a binder is heated and pressurized. A recycled tile that is formed by molding and is characterized by having elasticity, water permeability, resistance to electrolytic corrosion, and a predetermined external shape.