KR20130140346A - Compositions of additives for plastics and method for the production thereof - Google Patents

Abstract

The present invention relates to an additive for plastic and a production method of the same, more specifically, to the additive for the plastic which is used for producing an agricultural mulching film, a garbage bag, and a tent. The additive contains filler, anhydric maleic acid based binder, polyethylene or polypropylene wax, zinc based thermostabilizer, chlorinated polyethylene, a hot-melt adhesive or an ethylenevinyl acetate copolymer, and linear low density polyethylene. The filler is wood powder or calcium carbonate. The additive for plastic (plastic sheet) is economically produced by the present invention without decreasing the physical properties of a plastic product, and the manufacturing costs of the plastic product is remarkably reduced by adding the large amount of additive to a plastic material.

Description

Additives for plastics and methods for manufacturing the same {COMPOSITIONS OF ADDITIVES FOR PLASTICS AND METHOD FOR THE PRODUCTION THEREOF}

The present invention relates to an additive for plastics and a method for producing the same, and more particularly to an additive for plastics used in the manufacture of agricultural mulching film, a pay-as-you-go garbage bag, a tent and the like.

Synthetic plastics are widely used as packaging materials that are indispensable for life because of their cheap properties and light properties. In particular, in recent years, as its use has been extended to agriculture, it has played an essential role in agricultural development by providing functionality such as crop yield improvement and cultivation / harvesting time diversification. As a result, agricultural plastics use is forming a huge market of tens of thousands of tons.

In addition, various kinds of plastics are also used in various envelopes and tents such as a pay-as-you-go bag.

The above-mentioned agricultural plastic products (hereinafter referred to as 'vinyl products'), that is, mulching film, various bags, tents, etc. are mainly manufactured using raw materials based on polypropylene and polyethylene, and the polypropylene and polyethylene are made of petroleum. It is manufactured using raw materials. Accordingly, the price of polypropylene and polyethylene is fluctuated due to the sensitive reaction of raw material prices according to the fluctuation of international oil prices. Recently, the price competitiveness of vinyl products is deteriorated due to the increase in international oil prices and labor costs.

Therefore, in order to lower the manufacturing cost of the vinyl product, a separate additive, that is, a filler having a lower price than that of polypropylene or polyethylene, is manufactured to produce the product. As the filler, calcium carbonate or the like is used. Since the filler, such as calcium carbonate, causes problems such as deterioration in physical properties (elasticity, etc.) of the vinyl product, the amount of the filler (the total weight of the vinyl) Less than about 5%).

Therefore, there is a need to develop a product capable of increasing the amount of filler, that is, an additive, while lowering the manufacturing cost of the vinyl product.

Accordingly, an object of the present invention is to solve all the problems of the conventional plastic fillers, and to provide an additive for plastics so that the physical properties of the vinyl products are not degraded even when the vinyl product is manufactured by adding to polypropylene or polyethylene. will be.

In addition, by using a low-cost plastic additives to 60% of the total weight of the vinyl product, it is possible to lower the cost of the vinyl product.

In addition, by lowering the extrusion temperature of the plastic additive to increase the productivity of the plastic additive, it is to have a higher price competitiveness.

The additive for plastics of the present invention for achieving the above object is a filler, maleic anhydride binder, polyethylene or polypropylene wax, zinc thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density It comprises polyethylene (LLDPE), the filler is characterized in that the wood powder, calcium carbonate or a mixture thereof.

Here, the mixing ratio of the additive is 1 to 3% by weight maleic anhydride binder, 1 to 3% by weight wax, 0.5 to 1% by weight of zinc-based thermal stabilizer, 1 to 5% by weight chlorinated polyethylene, hot melt 70 to 90% by weight of the filler It is characterized by comprising 1 to 3% by weight of the adhesive or ethylene vinyl acetate copolymer, 5 to 15% by weight of linear low density polyethylene.

In addition, the additive is characterized in that it further comprises one or two or more selected from the group consisting of stearic acid, paraffin wax and poly wax.

And the manufacturing method of the additive for plastics according to the present invention, maleic anhydride binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) To a mixer, a first kneading step of stirring the mixture, wood flour, calcium carbonate or a mixture thereof is added to the first kneaded mixture, and a second kneading step of stirring for 3-7 minutes, and the second And extruding the kneaded kneaded material with an extruder.

Here, the first kneading step is characterized by kneading by stirring for 5 to 15 minutes at a speed of 900 ~ 1100rpm.

Here, the extrusion molding step is characterized in that the extrusion at a temperature of 160 ~ 180 ℃.

Here, the filler, maleic anhydride binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) are all less than 5% by weight of water. It is characterized by having a content.

Here, in the first kneading step, one or more selected from the group consisting of stearic acid, paraffin wax and poly wax may be added and kneaded.

According to the plastic additive of the present invention and a manufacturing method thereof, not only the price is low but also the additives which do not lower the physical properties of the vinyl product can be manufactured, and a large amount of the additive can be mixed with the vinyl raw material, thereby The manufacturing cost can be greatly reduced.

In addition, since the weight per unit volume of the additive is light, when a part of the polypropylene or polyethylene is replaced by the additive, it is possible to produce a vinyl product of a larger area.

Hereinafter, the present invention will be described in detail.

Additives for plastics of the present invention include fillers of wood powder, calcium carbonate or mixtures thereof, maleic anhydride binders, polyethylene or polypropylene waxes, zinc thermal stabilizers, chlorinated polyethylene, hot melt adhesives or ethylene vinyl acetate copolymers (EVA) and Linear low density polyethylene (LLDPE).

Calcium carbonate used as the filler was conventionally used as an additive in plastics, but calcium carbonate was difficult to add a large amount because the calcium carbonate deteriorates the elasticity of vinyl when combined with vinyl. However, in the present invention, the additive is obtained by kneading the maleic anhydride-based binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) together with the calcium carbonate. Because it manufactures a large amount of calcium carbonate will not reduce the elasticity of the vinyl.

The other filler, wood flour, is a material that is easily decomposed when buried in the ground, and is a suitable material for producing degradable plastics, that is, degradable vinyl. Therefore, in order to manufacture a product which is easy to be embedded in the ground such as a mulching film or an additive for eco-friendly plastics, wood powder instead of calcium carbonate is used as a filler alone.

Here, the wood powder is used for the 500 mesh or more, because if the particles of the wood powder is too large, it is difficult to extrude the vinyl, it may lead to a decrease in the physical properties of the vinyl.

The wood flour and calcium carbonate used as the filler are both low in cost and light in weight, so that even when the same weight is used, a large area of vinyl can be produced in comparison with other fillers. That is, the production of vinyl products can be maximized. The filler is used by 70 to 90% by weight.

And the maleic anhydride-based binder is to bind each raw material to each other, it is included within the range of 1 to 3% by weight. The reason is that when the maleic anhydride-based binder is less than 1% by weight, the role as a binder becomes insignificant, and when the maleic anhydride-based binder is less than 3% by weight, the amount becomes excessive, resulting in deterioration of the physical properties of the vinyl.

The wax is determined according to the raw material of the vinyl. If the vinyl is polypropylene (PP), the wax also uses PP wax. If the vinyl is polyethylene (PE), the wax also uses PE wax. do. The wax is used to reduce the burden on the device during extrusion, it is included in the range of 1 to 3% by weight. The reason is that if the wax is less than 1% by weight, the extruder is subjected to a large burden during extrusion, and if it is more than 3% by weight, the activity is increased so that the polymers do not entangle with each other and the vinyl can be easily broken.

The zinc-based thermal stabilizer is to act as a diffusion agent to have the dimensional stability and uniformity of the vinyl product produced. In the present invention, the type of zinc-based thermal stabilizer is not limited. For example, zinc Laurate may be used. The zinc-based thermal stabilizer is used in the range of 0.5 to 1% by weight, the effect of the zinc-based thermal stabilizer is less than 0.5% by weight, the effect is insignificant, and when exceeding 1% by weight, the resins are entangled with each other. This is because vinyl products can be broken easily.

In addition, the chlorinated polyethylene (CPE) is a thermoplastic elastomer having both plastic and rubber properties, and is used as an impact modifier to help prevent the elasticity of vinyl from being degraded even when an additive is added. At this time, the CPE is used in the range of 1 to 5% by weight, the amount is less than 1% by weight because the effect is insignificant, if it exceeds 5% by weight is expensive because the product cost can be increased. .

The hot melt adhesive or ethylene vinyl acetate copolymer (EVA) is to reduce the extrusion temperature of the vinyl product, because the lower the processing temperature of the additive, that is, the extrusion temperature increases the amount of processing per unit time, lowering the final cost of the product Will be effective. In addition, lowering the extrusion temperature reduces product defects, further reducing production costs.

By using the hot melt adhesive or EVA, it is possible to lower the extrusion temperature by more than 20 ℃ than the conventional extrusion temperature (180 ~ 210 ℃), because the hot melt adhesive or EVA has a lower molecular weight than the minerals and polymers used, When extrusion is performed, hot melt adhesive or EVA, which is a low molecular weight raw material, is attracted to the surface of the product, and the bonding strength is excellent when other raw materials are combined even though the extrusion temperature is reduced due to the hot adhesive or EVA having excellent adhesiveness. .

The hot melt adhesive or EVA is used in the range of 1 to 3% by weight, it is difficult to lower the extrusion temperature when the amount is less than 1% by weight, and can not lower the extrusion temperature any more than 3% by weight, It is preferable to use within the range. In addition, the hot melt adhesive does not limit the kind, any type of hot melt adhesive on the market can be used. For example, urea resin adhesive or the like may be used as the hot melt adhesive.

In addition, the linear low density polyethylene (LLDPE) is a subject that serves as an adhesive when mixed with polypropylene or polyethylene, which is a raw material of a vinyl product, the amount of which is preferably 5 to 15% by weight. When the amount is less than 5% by weight, it is difficult to mix with polypropylene or polyethylene, so that the physical properties of the vinyl product may not be good, and when the amount exceeds 15% by weight, the physical properties are good, but the price is high, thus burdening the product cost. Because.

In addition, as described above, fillers, maleic anhydride binders, polyethylene or polypropylene waxes, zinc-based thermal stabilizers, chlorinated polyethylene, hot melt adhesives or ethylene vinyl acetate copolymers (EVA) and linear low density polyethylene (LLDPE) In addition, one or two or more selected from the group consisting of stearic acid, paraffin wax and poly wax may be further included. The stearic acid, paraffin wax, and poly wax are intended to avoid burdening the extruder. Stearic acid, paraffin wax, poly wax, and the like, which are further mixed, are preferably used in a total amount of 0.5 to 1.5% by weight, which is considered in consideration of physical properties of the product.

Fillers, maleic anhydride-based binders, polyethylene or polypropylene waxes, zinc-based thermal stabilizers, chlorinated polyethylene, hot melt adhesives or ethylene vinyl acetate copolymers (EVA), linear low density, which are compositions constituting the additive for plastics of the present invention as described above Polyethylene (LLDPE), stearic acid, paraffin wax, poly wax and the like are all used as powder or granule crystals.

The additive for plastics of the present invention having the above-described structure is about 1/2 of the price of polypropylene or polyethylene, which is a raw material of plastic, and only 2/3 of the weight per unit volume of the raw material. It is possible to produce a large amount (wide area) of vinyl products to produce a vinyl product with a high price competitiveness.

In addition, even if the amount of the plastic additive is added as much as 60% of the total weight of the vinyl product, since the physical properties of the vinyl product are not lowered, it is possible to produce a more affordable vinyl product.

In addition, the present invention can produce environmentally friendly biodegradable plastic additives when using wood powder as a filler, it is possible to prevent the environmental pollution caused by vinyl products.

Hereinafter, the manufacturing method of the present invention will be described.

In describing the preparation method, the composition of the additive according to the present invention and the compounding ratio thereof have been sufficiently described above, and thus description thereof will be omitted.

First, a maleic anhydride binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) are added to a mixer, and the first stirring is performed. Knead. Here, the first kneading is kneading by stirring for 5 to 15 minutes at a speed of 900 ~ 1100rpm using a high speed stirrer, the temperature reaches about 100 ℃ when continuously stirring by friction heating. At this time, the reason for the stirring speed of 900 ~ 1100rpm is for fast and accurate kneading, and if the stirring time is less than 5 minutes, the sufficient kneading is not made, even if the mixing time exceeds 15 minutes, the time is 5 ˜15 minutes are preferred.

During the first kneading, one or two or more selected from the group consisting of stearic acid, paraffin wax, and poly wax may be added and kneaded, and the present invention is not limited thereto.

When the first kneading is completed, wood flour, calcium carbonate or a mixture thereof is added to the first kneaded kneaded material as a filler, and the second kneaded by stirring for 3 to 7 minutes. At this time, the stirring speed is the same as the first kneading, and if the stirring time is less than 3 minutes, sufficient kneading is not performed, and even if it exceeds 7 minutes, no further kneading is performed, so that kneading is carried out as described above.

Next, the second kneaded mixture is extruded and extruded. By making the extrusion method of the said extruder into a roll forming system, the yield can be further increased. In addition, the extrusion temperature of the extruder during extrusion is preferably 160 to 180 ° C. This is a value lowered by about 20 ° C. or more compared to the extrusion temperature (185 to 210 ° C.) of the conventional additive. The present invention is to reduce the extrusion temperature to increase the yield, as well as to reduce the defective rate.

Once the extrusion is complete, it is cooled and cut to complete the production of the additive.

The maleic anhydride binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) used in the present invention are all moisture. When the content of the dried content is less than 5% by weight is used, since a high moisture content can cause bubbles to produce a heterogeneous product.

Through the manufacturing process as described above, it is possible to manufacture an additive for plastics of excellent physical properties with a competitive price.

As described above, the present invention has been described with reference to the above embodiments, but various modifications can be made without departing from the scope and spirit of the present invention.

Claims (8)

Fillers, maleic anhydride binders, polyethylene or polypropylene waxes, zinc-based thermal stabilizers, chlorinated polyethylene, hot melt adhesives or ethylene vinyl acetate copolymers (EVA) and linear low density polyethylene (LLDPE), wherein the fillers are wood flour, An additive for plastics, characterized in that calcium carbonate or a mixture thereof. The method of claim 1,
70-90% by weight of the filler, 1-3% by weight of maleic anhydride binder, 1-3% by weight of wax, 0.5-1% by weight of zinc-based thermal stabilizer, 1-5% by weight of chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer An additive for plastics, comprising 1 to 3% by weight and 5 to 15% by weight of linear low density polyethylene. 3. The method according to claim 1 or 2,
An additive for plastics, characterized in that it further comprises one or two or more selected from the group consisting of stearic acid, paraffin wax and poly wax. Primary kneading step of adding maleic anhydride binder, polyethylene or polypropylene wax, zinc-based thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) to a mixer and stirring them Wow,
A second kneading step of adding wood powder, calcium carbonate or a mixture thereof to the first kneaded mixture and stirring for 3 to 7 minutes,
Method for producing an additive for plastics comprising the step of extruding the second kneaded kneaded material by an extruder. 5. The method of claim 4,
The first kneading step is a method for producing a plastic additive, characterized in that the kneading by stirring for 5 to 15 minutes at a speed of 900 ~ 1100rpm. 5. The method of claim 4,
The extrusion molding step is a method for producing an additive for plastics, characterized in that the extrusion at a temperature of 160 ~ 180 ℃. 5. The method of claim 4,
The filler, maleic anhydride binder, polyethylene or polypropylene wax, zinc thermal stabilizer, chlorinated polyethylene, hot melt adhesive or ethylene vinyl acetate copolymer (EVA) and linear low density polyethylene (LLDPE) all have a water content of less than 5% by weight. Method for producing a plastic additive, characterized in that it has. 5. The method of claim 4,
At the time of the first kneading step, additives for plastics, characterized in that the kneading by additionally added one or two or more selected from the group consisting of stearic acid, paraffin wax and poly wax.