KR20010114185A - regenerated rubber and method for producing goods by using the same - Google Patents

Abstract

The present invention relates to a recycled rubber and a method for producing a product using the same, which is obtained by pulverizing waste tires or water products after manufacture of rubber products and collecting the powder of rubber through an analytical process. 0.5 to 3.0 g, 0.1 to 0.6 ml of amine and 1.5 to 8 ml of toluene were mixed, and the pulverized rubber powder was added to an appropriate amount, stirred, and left to stand for 20 to 50 hours to be softened at room temperature, followed by 10 to 45 to 55 ° C. By mixing tire cord with the product obtained by the Soviet Union for a minute, it is possible to produce rubber products with very light and excellent physical properties because they have excellent wear resistance, hardness, and strength while the specific gravity of the molded product is smaller than the average specific gravity of general rubber molded products. In terms of environmental protection, it is possible to recycle waste tires and synthetic rubber waters, as well as waste tires that were simply disposed of. I can get the effect that you can contribute.

Description

Regenerated rubber and method for producing goods by using the same

The present invention relates to a recycled rubber and a method for producing a product using the same, more specifically, by using rubber and tire cords from natural tires and synthetic rubbers, as well as waste tires, which are discarded after manufacturing shoe soles or tires. The present invention relates to a method for reclaiming waste rubber that can be regenerated to have the same or higher properties as new rubber.

In order to effectively utilize resources and to prevent environmental pollution, which has emerged as an important social problem, the problem of regenerating high molecular materials from all over the world has emerged as an important task.

Moreover, the recycling of rubber is an urgent problem in Korea, where raw rubber is entirely dependent on imports.

At present, tires of large buses and trucks mainly made of natural rubber are crushed, mixed with regenerant, heated to about 200 ° C, thermally aged and depolymerized, softened and regenerated, and mixed with new rubber. Although the product is produced, this natural rubber regeneration method is also a method of heating the organic chemicals and oil under a certain pressure to maintain the high temperature for several hours, which is not a desirable method in terms of energy, and must be mixed with the new rubber. Only could meet the physical properties required for ordinary rubber products.

In addition, the method was not limited to natural rubber and did not soften and regenerate synthetic rubber vulcanizates, which are widely used after World War II. Particularly, the waste rubber of small tires mainly composed of styrene-butadiene rubber (SBR), which is a representative rubber of synthetic rubber, hardens without being softened and regenerated because it is easy to cause cross-linking reaction without heat aging and depolymerization when heated. It was not possible to play back.

In order to solve these drawbacks, many researches have been conducted by domestic and foreign companies and research institutes to regenerate synthetic rubber, and one of the known methods is developed in Japan, and the styrene-butadiene rubber is about 200 ° C in the presence of oxygen-free. It has been found that the synthetic rubber becomes soft when heated to temperature, but the recycled rubber of the quality that can be utilized cannot be obtained, and thus it has not been put to practical use.

For example, when treated with a complex of phenylhydradine and iron (II) chloride, natural rubber as well as synthetic rubber were found to be easily softened and recycled at room temperature irrespective of the crosslinked structure of various vulcanized products, but the obtained softened rubber was vulcanized again. When manufactured, the physical properties such as tensile strength, elongation rate, and tensile stress of the resulting elastic body were significantly lowered, which was not satisfactory for practical use.

In addition, the tire cord used as a rubber reinforcing material when manufacturing tires is not useful when disposing of tires, and is not recycled at all, but is simply disposed of, thereby causing environmental pollution along with waste of resources.

The present invention has been made to solve the above problems, the present inventors have been engaged in the rubber field for several decades, so that the vulcanized rubber can be effectively applied to various applications by regenerating the water and waste rubber of the new natural and synthetic rubber remaining after cutting The results of repeated studies and repeated experiments to develop a softening and regeneration reagent for petroleum refining agents have been shown to be impossible until now with natural rubber when combined with a combination of cuprous chloride and amine compounds. The company has developed a way to efficiently recycle all kinds of synthetic rubber.

That is, the present invention can solve the above-mentioned shortcomings in the regeneration of natural and synthetic rubber, can simplify the regeneration work, reduce the loss of energy, and soften the desulfurization process and depolymerization process under atmospheric oxygen, In particular, it is possible to recycle synthetic rubber, and simply by recycling the waste tires in the waste tires to provide a breakthrough method for manufacturing recycled rubber products with superior properties than conventional ones.

The reclaimed rubber according to the present invention is obtained by pulverizing waste tires or manufactured water products after the manufacture of rubber products, and collecting the powder of rubber through an analytical process, and when the rubber powder is 100g, 0.5 to 3.0 g of copper chloride (I) and 0.1 to amine 0.6 ml and toluene were mixed at a ratio of 1.5 to 8 ml, and when the mixture became dark green or brown, the pulverized rubber powder was added to an appropriate amount, stirred, and left to stand for 20 to 50 hours to be softened at room temperature. It is made by mixing tire cord with a product obtained by soaking for 10 minutes.

At this time, the mixing ratio of the product and the tire cord is 1: 7.5 is the best.

In the production of such recycled rubber of the present invention, in addition to the product and the tire cord, a mixture of raw rubber, tire recycled rubber, zinc malt, stearic acid, accelerator and sulfur, and the like may be used together, and the amount of the product is 8.0 to 9.8% by weight. Raw rubber 4.0 to 5.0% by weight, tire regenerated rubber 15.4 to 20% by weight, tire cord 60 to 70% by weight, zinc mal 0.8 to 1.7% by weight, stearic acid 1.0 to 2% by weight, accelerator 0.3 to 0.5% by weight and sulfur 0.5 -1 weight% is the most suitable.

The ratio of the mixture is not limited to a value determined in consideration of the production cost and the optimum effect of several experiments.

In addition, the method for producing a product using the recycled rubber of the present invention is to collect the powder of rubber through the analysis process by grinding waste tires or rubber products after manufacturing rubber products, and when the rubber powder is 100g of copper chloride (I) 0.5 ~ 3.0 g, 0.1 to 0.6 ml of amine and 1.5 to 8 ml of toluene were mixed, and when the mixture became dark green or brown, the crushed rubber powder was added to an appropriate amount, stirred, and left to stand for 20 to 50 hours to soften at room temperature. A mixing step of mixing and grinding tire cords to the product obtained by soaking for 10 minutes at 45 to 55 ° C; And a molding step of pressing and compressing the mixture into a roller to form the sheet into a sheet state, and a molding process of cutting the mixture in the pressed sheet state to a predetermined thickness and length and molding the mixture into a press.

The copper chloride (I) used in the present invention is preferably added in an amount of about 0.5 to 3/100 based on the weight of the rubber powder to be treated.

In addition, the amine as a softening and regenerating agent may be various amines such as triethylamine, tributylamine, tetramethylethylenediamine, pyridine-ethanolamine, and the like. Tributylamine and triethylamine are effective.

In the mixing step, the product 8.0 to 9.8% by weight, the raw rubber 4.0 to 5.0% by weight, the tire reclaimed rubber 15.4 to 20% by weight, tire cord 60 to 70% by weight, zinc zinc 0.8 to 1.7% by weight, stearic acid 1.0 to It is most preferable to mix 2 weight%, 0.3-0.5 weight% of accelerators, and 0.5-1 weight% of sulfur.

Although the reactor of the present invention according to the mixture consisting of the above components is not clearly identified, copper chloride (I) and amine during chemical softening and regeneration process are chemically changed to confuse rubber powder to ion-separate to contain hydroxyl group or carbonyl group. It is assumed that the separated ions are rearranged in the raw rubber state as a basic cause of desulfurization and depolymerization, and toluene is softened smoothly because it melts and decomposes the components of rubber.

In the present invention, natural rubber vulcanized with sulfur, nitrile-butadiene rubber (NBR) vulcanized with sulfur, styrene-butadiene rubber vulcanized with sulfur or organic peroxide, organic peroxide or CZ (N-cyclohexyl-2 Almost all natural and synthetic rubbers such as polychloroprene rubber vulcanized with -benzothiazolylsulfenamide) and various diene rubbers vulcanized with various vulcanizing agents can be recovered.

Tire cords used in the present invention can also be made of polyester, polyamide, or a strong dog, etc. The amount is more than 10 times compared to natural rubber is very light when it exceeds 17 times, but as a rubber product Since it is unsuitable, it is preferable to add in the said range.

Hereinafter, the present invention will be described by way of one preferred embodiment, which is only for facilitating the understanding of the present invention, and the present invention is not limited thereto, but the scope of the appended claims and the scope and spirit of the present invention are not limited thereto. Modifications and variations are possible without departing from those skilled in the art.

In this example,% represents the weight percentage.

<Example>

The small discarded tire was pulverized and passed through a net of 554 μm (30 mesh) except for tire cords and metal pieces, and only rubber components were collected.

0.5 g of copper (I) chloride, 0.4 ml of tributylamine and 2.0 ml of toluene were added to the test vessel, and the mixture was mixed well and allowed to stand for several hours to proceed with the chemical reaction.

When the color of the mixture contained in the test container became dark green to brown, 100 g of the rubber powder prepared and collected therein was added thereto, stirred, and left for 29 hours.

The treated rubber thus obtained was softened at room temperature and then subjected to USSR at 45 ° C. for 10 minutes to obtain the desired softened recycled rubber.

8.8% by weight of the obtained softened recycled rubber, 4.4% by weight of raw rubber, 17.5% by weight of tire regenerated rubber, 65.8% by weight of tire cord, 1.1% by weight of zinc oxide, 1.3% by weight of stearic acid, 0.4% by weight of accelerator and 0.7% by weight of sulfur It was.

The recycled rubber thus produced was measured at 100 ° C. using a Mooney viscometer. The softened reclaimed rubber was then used in a conventional manner, 10 ml of liquid cumaron inden resin, 0.5 ml of stearic acid, 1.5 ml of sulfide, 2.5 ml of zinc oxide, and mercaptobenzothiazole ( mercaptobenzotiazol) 0.25 ml and 0.1 ml diphenyl guanidine vulcanization accelerator was used to press vulcanized at 140 ℃ for 40 minutes and then to measure the physical properties of the regenerated vulcanized rubber.

In other words, the tensile test was carried out with a tensile stress recorder and the aging test was accelerated aging for 8 hours at 120 ° C.

The results were superior to those of commercially available natural regenerated rubber and were low in specific gravity and superior in strength, and were superior to physical properties in the following comparative examples as shown in Table 1 below.

In addition, it was found that the heat aging resistance is much superior to the natural recycled rubber that is commercially available through the hot air aging test.

<Comparative Example>

The rubber powder was taken in the same manner as in the above example, and the mixture of phenylhydrazine and iron (II) chloride was mixed in an appropriate amount and introduced into the reaction vessel, followed by water at a temperature above atmospheric temperature and slightly higher than 120 ° C. The reaction was carried out for a time.

The softened reclaimed rubber thus obtained was press-vulcanized in the same manner as described in the above examples, and the physical properties thereof were observed. As a result, the physical properties were as shown in Table 1, and were significantly lower than those in the above examples. This was clearly contrasted.

Table 1

Example Comparative Example MS _{1 + 4} (100) 88 54 T _B (㎏ / ㎠) 94 50 E _B (%) 280 260 M200 (㎏ / ㎠) 55 40

As described above, according to the recycled rubber of the present invention and a method for producing a product using the same, it is possible to soften and recycle natural rubber as well as synthetic rubber with a simple and low energy requirement. Excellent hardness and strength, but the specific gravity of the molded product is about 0.9, which is less than the average specific gravity of the general rubber molded article 1.4, there is an effect that can produce a rubber product of very light and excellent physical properties.

In other words, it is possible to manufacture rubber products that have excellent physical properties and low unit cost by using cords of recycled rubber and waste tires without adding raw rubber at all, which can significantly reduce the amount of rubber imports in Korea that depend on importing raw rubber. In addition to being effective in terms of aspects, it has also contributed greatly in terms of environmental protection.

Recycled rubber according to the present invention is excellent in physical properties can be preferably used as a rubber product of various uses, such as sidewalk blocks, soles, industrial rubber plates, packing materials, golf course mats.

Claims (2)

After grinding waste tires or rubber products, powders of rubber are collected through analytical process, and when the rubber powder is 100g, 0.5 ~ 3.0g of copper chloride (I), 0.1-0.6ml of amine and 1.5-8ml of toluene When the mixture is dark green or brown, and the mixture is stirred in an appropriate amount of the crushed rubber powder, left for 20 to 50 hours to soften at room temperature and then used for 10 minutes at 45 to 55 ℃ to tires to the product obtained Regenerated rubber, characterized by mixing the cord. After grinding waste tires or rubber products, powders of rubber are collected through analytical process, and when the rubber powder is 100g, 0.5 ~ 3.0g of copper chloride (I), 0.1-0.6ml of amine and 1.5-8ml of toluene When the mixture is dark green or brown, and the mixture is stirred in an appropriate amount of the crushed rubber powder, left for 20 to 50 hours to soften at room temperature and then used for 10 minutes at 45 to 55 ℃ to tires to the product obtained A mixing step of mixing and grinding the cord; A pressing step of pressing and pressing the mixture with a roller to form a sheet; And a molding process of cutting the compressed sheet state into a predetermined thickness and length to form a press.