KR100455803B1 - Products manufacturing process for recycling waste plastics - Google Patents

Abstract

The present invention relates to a method for producing waste plastic molding for recycling waste plastic, which allows extrusion plastic molding of waste plastic molding having a smooth surface and excellent mechanical hardness and strength by mixing various waste plastics having different properties without selection. In the manufacture of waste plastic moldings by mixing various kinds of waste plastics having different properties and inorganic particles, and putting them in an extruder and melting them, the waste plastics composed of thermoplastic resins and thermosetting resins are 80 to 85% by weight. 5-10 wt% of inorganic fillers selected from the inorganic group consisting of serpentine, feldspar, perennial stone, fluorite, mica (mica), graphite, and dolomite, with 3 to 5 weight of binder microwax Consisting of aerosil, galvanized, titanium oxide, benton as% and remaining balance Each composition including the other binder was stirred at a high speed rotation at 900 to 1000 rpm for 10 minutes while mixing the composition to 100% (weight), and then the stirred mixture was introduced into an extruder at a temperature range of 180 to 280 ° C. The invention is characterized by producing an object by extruding while melting.

Description

Manufacture method of waste plastic molding for waste plastic recycling

The present invention relates to a method for producing waste plastic molding for waste plastic recycling, which allows extrusion of a waste plastic molding having a smooth surface and excellent mechanical hardness and strength by mixing various waste plastics having different properties without selection. .

As industrial technology develops day by day, many products using plastics are increasing. Accordingly, various methods for recycling waste plastics generated by plastic products having reached the end of their service life have been proposed.

By the way, plastic has the property that the components and properties of the same fusion is well done, but if the components are different, the fusion is not.

In addition, in order to recycle the waste plastics, the waste plastics can be recycled only after they have been collected and sorted according to the type and color of the same raw material.

Therefore, as a technology that can be recycled without separating the various waste synthetic resins by type, it is published as a patent No. 227305 in the domestic registered patent.

Although the above patent proposes a method of mixing various component waste synthetic resins by type and irrespective of the mixing ratio of the respective components, it is proposed that the wastes having different components as shown in the contents of the invention described in the claims of the above patent. It can be seen that the synthetic resin liquids are bonded by talc pulverized into 100-200 mesh.

However, the above patent only plays the role of a medium that binds the melted resin solution to inorganic talc particles from all directions and binds the resin solution with different properties, so that the surface of the extruded molding is rough and has insufficient strength. It is pointed out.

The present invention has been proposed in view of the above-mentioned general matters. The surface of the thermoplastic resin and thermosetting waste plastics having different melting points and properties is extruded by mixing and melting without sorting or washing. The invention was invented for the purpose of producing a smooth, high strength waste plastic recycled molding.

Technical means of the present invention for this purpose,

In the manufacture of waste plastic moldings by mixing various waste plastics having different properties and inorganic particles and injecting them into an extruder and melting them,

The waste plastics composed of thermoplastic resins and thermosetting resins are 80 to 85% by weight, and serpentine, pyrophylite, olivines, aluminium, mica and mica are graphite. 5-10% by weight of an inorganic filler selected from the inorganic group consisting of bauxite, dolomite and montmorllonite, and the binder microwax is 3%. After stirring for about 10 minutes at a high speed rotation at 900 ~ 1000rpm in a mixed state containing ~ 5% by weight, the mixture is put into an extruder and extruded while melting at a temperature range of 180 ~ 280 ℃ to prepare a molding It is characterized by.

In addition, the binder is 3 to 5% by weight of the microwax (microwax) and aerosil (azero), zinc (zno), titanium oxide (TiO ₂ ), Benton (bentonite) each of the components in a range of 10% by weight in total It is characterized by

In addition, when added to the extruder in a state in which the waste plastic, binder and filler are mixed, an antistatic agent is added 0.2 to 0.3% by weight based on the total weight of the mixture, characterized in that the injection molding machine to produce a to-be-molded product.

Preferred embodiments of the present invention will be described below.

The present invention is characterized in that the waste plastic to be disposed of is used as a main raw material, and a filler made of inorganic matter is used as an auxiliary raw material, and a small amount of microwax, which is a superposition agent, is added thereto and mixed. 3 to 5% by weight of microwax plus 10% by weight of components such as aerosil, zinc (ZnO), titanium oxide (TiO ₂ ) and bentonite, or a very small amount of antistatic agent By mixing to extrude the waste plastic recycled molding.

Waste plastics used in the present invention are polyvinyl chloride (PVC), polystyrene (PS), ABS resin, polyacetal (POM), polyethylene (PE), polyamide (PA), nylon (NAL), nylon fibers, polypropylene Thermoplastic waste plastics such as (PP), acrylic, polycarbonate (PC), polyethylene terephthalate (PETP), cellulose acetate (CA), ethyl cellulose (EC), and polyvinyl acetate (PVAC); ; Thermosetting waste plastics such as melamine resin (MF), phenol resin (PF), urea resin (PUR), epoxy resin (EP), polydiaryl phthalate (PVAE), etc. are used. Pure plastic products, as well as all waste plastics obtained from all products manufactured by mixing with non-plastic materials such as metals, feeders, wood, etc.

In addition, the waste plastics are taken as they are obtained during the disposal of each product, and used to be crushed to a predetermined size, that is, 5 to 15 mm in size and 1 to 3 mm in thickness.

The used amount of the waste plastic is mixed in the range of 80 to 85% by weight with respect to the total weight of the molding, and when the waste plastic is more than 85% by weight, deformation of the molded product may occur, such as distortion, which may cause stability problems. When the waste plastic is 80 wt% or less, a problem may occur such that mechanical properties such as hardness and strength of the molding are lowered.

In addition, microwax and graphite were added together with the waste plastic to maintain the surface gloss of the molding and complement the acid resistance, corrosion resistance and mechanical strength.

The filler used in the present invention is a mixture of two or more selected from an inorganic group consisting of serpentine, feldspar, olivine, fluorite, mica, mica, graphite, bauxite, dolomite, and montmorllonite. Inorganic fillers are excellent in mechanical properties, that is, hardness and strength, etc., as the moldings are extruded in a uniformly distributed state in the process of melting and mixing various kinds of waste plastics having different properties. In this role, the amount of the inorganic filler is in the range of 5 to 10% based on the total weight of the molding, and the inorganic filler is preferably pulverized to 300 to 350 mesh. This means that the more finely ground the inorganic filler is, the more uniformly it can be mixed in the waste plastic melt. Because.

The present invention is characterized by mixing 80 to 85% by weight of waste plastics and 5 to 10% by weight of a filler, including 3 to 5% by weight of a microwax as a binder, and further comprising the waste wax and microwax as a filler and a binder. After rotating at high speed at 900 to 1000 rpm and stirring, heating and heating to a temperature of 180 to 280 ° C. to melt the object to be extruded.

The waste plastic is mixed in a state where the particle size is as small as 5 to 15 mm and thin as 1 to 3 mm as described above, and the inorganic filler is finely ground to 325 mesh as described above, and the binder is micro The wax is used powdered.

The binder microwax is very strong adhesive when melted in the liquid phase has a property that once adhered to any material does not fall off, so when melted in the liquid phase by applying heat with various waste plastics two or more wastes of different properties It is responsible for the role of the crosslinking agent to bond the plastic solution and the solution.

In addition, the microwax also plays a role of enhancing the binding force between the waste plastic solution and the finely divided filler particles.

And the mixing of waste plastic, filler and microwax is used a blender (Banbury mixer), the mixing is agitated mixing at a high speed of 900 ~ 1000rpm. As they are cut or pulverized smaller, they become well mixed with finely divided fillers and powdered microwaxes.

In the above, the time required for mixing the waste plastic particles with the fine powder filler and the microwax of the binder at a high speed of 900 to 1000 rpm is about 10 minutes.

The mixture mixed by the mixer as described above is injected into a single screw or twin screw extruder and melted under high temperature conditions of 180 to 280 ° C. while extruding the molding through an extrusion mold. When the melting temperature is 180 ° C. or lower, Waste plastics having a higher melting point remain in the granular state, which adversely affects the physical properties of the moldings, and when melted at 280 ° C. or higher, electrical energy is unnecessarily consumed and economic efficiency is low.

Therefore, the mixture is preferably dissolved by heating to a temperature range of 180 ~ 280 ℃. The reason for this is that plastics have different melting points depending on their components. Generally, waste plastics with low melting point are melted at 180 ° C and waste plastics with high melting point are completely dissolved at a temperature of 280 ° C. In the temperature range of 280 ° C, all waste plastics are melted by heating to a temperature at which they can be completely dissolved. In addition, the single- and twin-screw extruders are extruded while mixing the dissolving mixture. As it is mixed, it is extruded into an object through an extrusion mold.

On the other hand, the microwax of the binder is a small amount of 3 to 5% by weight compared to the total weight of the molding, but evenly dispersed and mixed with finely divided particles of various waste plastic solutions and inorganic fillers, the waste plastic solution and solution of different properties In addition, the extruded molded article is in a state of excellent mechanical hardness and strength as it plays a role of a crosslinking agent that strongly binds fine particles of the filler, and the surface of the molded article is smoothed by the crosslinkability of microwax. .

When the inorganic filler is mixed at less than 5% by weight, it is impossible to control the shrinkage coefficient of each of the waste plastics having different properties, so that deformation, such as distortion, may occur during extrusion of the molded product. In the case of mixing, the hardness and strength, which are mechanical properties, may be lowered after extrusion of the molding. Therefore, the inorganic filler is preferably mixed in the range of 5 to 10% by weight.

Next, as a binder, components such as aerosil, zinc oxide (Zno), titanium oxide (TiO ₂ ), bentonite, etc., which are binders other than microwax, are used together with the microwax to the total weight of the mixture. It is mixed in the range of 10% by weight in total, and the binders of each component serve to increase the binding strength of the molding together with the microwax.

Among the binder components, aerosil is used as a micronized powder on the order of 1 micron. As the aerosil particles are very fine, the specific surface area is very large. In addition, the aerosil particles have a structure in which silicon (Si) and oxygen (O) atoms are combined and have a refractive index in the range of 1.45 to 1.55, which promotes their dispersing effect when the waste plastic and microwax are dissolved. It is responsible for promoting uniform dispersion by dispersing the microwax solution. Therefore, the crosslinking force of the binder microwax is increased.

Among the binder components, zinc, titanium oxide, and benton each have a caking property, and thus act to increase the crosslinking force with the waste plastic solution together with the microwax. In addition, zinc oxide and titanium oxide among the above binder components have the effect of blocking ultraviolet rays.

On the other hand, by adding a very small amount of the antistatic agent as the filler component, the molding can be extruded, wherein the timing of the antistatic agent is added together when the mixture is mixed in the mixer into the extruder, and the amount of antistatic agent Is added to 0.2 to 0.3% by weight based on the total weight (100%) of the mixture introduced into the extruder.

As described above, the antistatic agent added to the mixture introduced into the extruder is mixed in the process of being transported and melted together with the mixture in the extruder. Thus, the antistatic agent introduced into the extruder together with the mixture may cause the waste plastic to melt in the extruder. It has the effect of dissipating explosive gas generated at the time, and prevents bubbles from forming on the surface of the object by the gas, thereby smoothing the surface of the extruded object and preventing static electricity from being produced. Indicates.

Embodiments for producing a waste plastic plate (plate) in the present invention as described above are as follows.

Examples 1 to 6 are examples of selectively mixing among a total of 19 waste plastics listed in Table 1 below, wherein the waste plastic mixing ratio is in the range of 80 to 85% by weight and is in Kg units. As a binder, microwax is in the range of 3 to 5% by weight, and other binders, aerosil, zincated, titanium oxide, and benton, are each mixed with microwax in the range of 10% by weight in Kg units. In addition, as a filler, components such as serpentine, feldspar, fluorite, olivine, mica, graphite, voxite, dolomite, and mondhalonite are contained in Kg units within 5 to 10% by weight of at least two components. The antistatic agent is added to the extruder by adding YT-AS 2000 (trade name) manufactured by Eugene Tech Co., Ltd. (trade name) in the range of 0.2 to 0.3% by weight in Kg units, bracket Extrusion molding temperature according to the embodiment is carried out in the range of 180 ~ 280 ℃.

As shown in [Table 1], when the various types of waste plastics, the binder and the filler are mixed, the surface of the molded object is cooled by cooling water of about 15 ° C. while extruded a plate having a width of 10 cm and a thickness of 15 mm as an extruder. This homogeneous and smooth extrusion was visually confirmed that the physical properties of the extruded molded product measured by the hardness and various strength tests of the mechanical properties are shown in Table 2 below.

Item 예 Example Number Example 1 Example 2 Example 3 Example 4 Example 5 Example 6 SHOREA 96A 98A 90 A 97A 95A 88A Compressive Strength Kgf / cm ² 245 265 197 250 240 192 Tensile Strength Kgf / cm ² 108 102 120 104 112 132 Impact Strength Kgf / cm ² 5.6 4.2 6.6 6.9 5.8 7.2

As shown in the above [Table 2], the waste plastic molded product produced by the present invention has excellent mechanical properties in terms of hardness and strength, and also has excellent heat resistance, weather resistance, durability, acid resistance, corrosion resistance, and extrusion molding method like conventional plastics. It can be used if it can be manufactured, but considering the fact that the raw material is waste plastic, it is not related to hygiene and requires strength, and it is a product that requires construction materials such as building floor materials, wall finishing materials, partitions, formwork, earth plate, and pressure pipe. Various pipe products, such as houses, houses, agricultural supports, sewage pipes, and transport pipes for transporting industrial water, can be extruded.

According to the present invention as described above it is possible to contribute to the recycling of various waste plastics by collecting the various waste plastics to be disposed of as industrial waste, and by using a small pulverization as a raw material without performing sorting and washing operations, and also mechanical hardness And useful inventions that provide methods for making products of high strength.

Claims (3)

In the manufacture of waste plastic moldings by mixing various waste plastics having different properties and inorganic particles and injecting them into an extruder and melting them, Various waste plastics composed of thermoplastic resins and thermosetting resins are 80 to 85% by weight, and inorganic fillers of two or more kinds selected from inorganic groups consisting of serpentine, feldspar, peridotite, fluorite, mica (mica), graphite and dolomite. Is 5 to 10% by weight, and each of the above compositions is 100% by weight, including 3 to 5% by weight of the microwax binder and other binders consisting of aerosil, galvanized, titanium oxide, and benton as the remainder. After mixing for about 10 minutes at a high speed rotation at 900 ~ 1000rpm in a mixed state, and put the stirred mixture into the extruder while extruding while melting in the temperature range of 180 ~ 280 ℃ to produce a molded object, characterized in that Waste plastic molding for the production method. delete The method of claim 1, When the waste plastic, binder and filler are mixed into the extruder, the waste plastic is recycled by adding 0.2 to 0.3% by weight of an antistatic agent to the extruder to prepare the molding. Waste plastic molding for the production method.