KR101276101B1 - A manufacturing method of asphalt using waste vinyl for agriculture - Google Patents

Abstract

The present invention relates to a method for producing asphalt mixture using waste vinyl for agriculture, and more particularly, comprising the steps of heating the asphalt, adding a resin to the asphalt, and stirring the resin added to the asphalt. In the state in which the AP-5 asphalt of a certain penetration (penetration) is melted at a constant temperature, by adding a predetermined amount of particulate asphalt substitute material to a predetermined amount of the molten asphalt and stirred for a predetermined time at a constant stirring speed at a certain temperature And a step of adding a photoinitiator Benzophenone (BP to the asphalt which has undergone the stirring process, and then irradiating UV ultraviolet rays for a predetermined time with a predetermined range of wavelengths (nm) and a predetermined range of irradiation doses. Is any one or two selected from waste vinyl such as LDPE, HDPE, EVA and PVC. Asphalt mixture using agricultural waste, characterized in that the plastic composition of a mixture to the preparation method on.

Description

Method for manufacturing asphalt mixture using agricultural waste vinyl {A MANUFACTURING METHOD OF ASPHALT USING WASTE VINYL FOR AGRICULTURE}

The present invention is to produce a pellet by melt-extruding the waste vinyl used for agricultural use, and then reacted with the cyclohexane to powder the pellet prepared as described above, to use it as an alternative to asphalt,

Even if the substitute material according to the present invention is used, it is possible to replace agricultural waste vinyl for a part of asphalt without changing the basic physical properties of the asphalt, thereby having economic and environmental improvement effects.

Rather than before using an alternative, asphalt curing method improves the strength characteristics and by adding a photoinitiator BP (Benzophenone) UV curing to the asphalt mixture manufacturing method having the effect of increasing the viscosity and viscoelastic stress.

Waste vinyl used for agriculture is mainly divided into low density polyethylene (LDPE) and high density polyethylene (HDPE).

The LDPE is one of the most used resins in Korea, along with HDPE, PP (Poly Propylene) and PVC (Poly Vinyl Chloride). It is colorless and transparent, so it has good electrical insulation and chemical resistance, etc. Widely used in film and envelopes, communication cables, agricultural films, bottled containers. In total, about 10% of agricultural film is used.

The HDPE is also one of the most used resins in Korea along with LDPE, PP, PVC. About 4% of the total real demand is used for agriculture, which is less than LDPE, but the overall real demand is more. The appearance overlaps with LDPE but there are some differences. The purity of waste vinyl is 12.2% for resin, 69.5% for xanthoic soil, 4.1% for finished products and 14.2% for others. Waste vinyl requires a lot of seals to be decomposed, and the most preferred method is recycling because waste generates secondary pollution of the atmosphere.

Therefore, there is an urgent need for a technology for treating agricultural waste vinyl, which is difficult to recycle and causes environmental pollution.

Republic of Korea Patent Publication No. 10-2010-0120955 (published November 17, 2010) Republic of Korea Patent Publication 10-2010-0025081 (Published date: March 09, 2010) Republic of Korea Patent Publication 10-2005-0090336 (published September 13, 2005) Republic of Korea Patent Publication 10-2010-0001386 (published Jan. 6, 2010)

In order to solve the above problems, the present invention after the powdering process for using the agricultural waste vinyl as a substitute, by using the powdered agricultural waste vinyl as a substitute that can replace a portion of the asphalt, Provides a method for producing asphalt mixture using waste vinyl for agriculture, which has the economic advantages of recycling waste vinyl and the environmental improvement effect by treatment of environmental pollutants and does not cause any difference between the physical properties of asphalt before using alternative materials. What is intended is for the purpose of the invention.

In order to achieve the above object,

The present invention comprises the steps of heating the asphalt,

Adding a resin to the asphalt,

In the step consisting of stirring the resin added to the asphalt,

In the state of melting AP-5 asphalt having a penetration rate of 60 to 80 at 130 ° C., 10 to 30 wt% of the fine asphalt substitute is added to 70 to 90 wt% of the molten asphalt to 4,000 at a temperature of 150 to 170 ° C. Stirring for 30 minutes to 1 hour and 30 minutes at a speed of ˜4,500 rpm,

Benzophenone (BP, C ₆ H ₅ COC ₆ H ₅ ), a photoinitiator, was added to the asphalt after the stirring process, followed by UV for 30 to 90 seconds at a wavelength (nm) of 300 to 450 and an irradiation dose of 18 mW / m 2. It is made through the step of irradiating ultraviolet rays,

The asphalt substitute material is any one or a mixture of two or more selected from low density polyethylene (LDPE), HDPE (high density polyethylene), EVA (Ethylene vinyl acetate), PVC (Polyvinyl chloride) and agricultural waste vinyl (waste vinyl) After washing the composition to dry and melt extrusion to prepare a pellet, the prepared pellet and cyclohexane (cyclohexane) is mixed in a 1: 1 weight ratio, and put into the reaction tank, the pressure of the reactor 3 to 8 atm pressure And a waste mixture of 30 to 40 minutes by stirring and mixing at 130 to 150 rpm while maintaining the temperature of 150 ~ 300 ℃ filtered to remove the cyclohexane and dried at room temperature to produce a powder using agricultural waste vinyl, characterized in that Asphalt mixture production method is the main technical configuration.

The asphalt substitute is composed of 20-40 wt% of agricultural waste vinyl powder of LDPE, 20-50 wt% of agricultural waste vinyl powder of HDPE, and 30-60 wt% of rubber, wherein the rubber has an average particle size of 100 μm. Characterized in that it is a waste fluorine rubber.

Asphalt mixture manufacturing method using agricultural waste vinyl according to the present invention after the powdering process suitable for utilizing the agricultural waste vinyl as a waste material as an alternative to the asphalt, by replacing a portion of the asphalt with a substitute material to recycle the waste resources It has an economical benefit, and has an environmental improvement effect by disposing of agricultural waste vinyl, which is a cause of environmental pollution.

In addition, the asphalt produced according to the production method of the present invention does not cause a difference in physical properties as compared with the asphalt before using an alternative material, but rather enhances the strength characteristics during asphalt hardening and adds a photoinitiator BP (Benzophenone). UV curing has the effect of increasing the viscosity and viscoelastic stress.

Hereinafter, a detailed description of the above technical configuration will be made.

The present invention relates to a method for producing an asphalt mixture using agricultural waste vinyl as an alternative to asphalt, wherein the molten asphalt 70 to 90wt in a state of melting AP-5 asphalt having a penetration of 60 to 80 at 130 ° C. Adding 10 ~ 30wt% of fine granular substitute material to% and stirring for 30 minutes to 1 hour 30 minutes at a speed of 4,000 to 4,500 rpm at a temperature of 150 to 170 ℃,

Benzophenone (BP, C ₆ H ₅ COC ₆ H ₅ ), a photoinitiator, was added to the asphalt after the stirring process, followed by UV for 30 to 90 seconds at a wavelength (nm) of 300 to 450 and an irradiation dose of 18 mW / m 2. It is made through the step of irradiating ultraviolet rays.

The asphalt substitute material is any one or two or more selected from among low density polyethylene (LDPE), high density polyethylene (HDPE), ethylene vinyl acetate (EVA), and waste vinyl (polyvinyl chloride) After washing and drying the composition prepared by melting and extrusion to prepare pellets, the prepared pellets and cyclohexane (cyclohexane) is mixed in a 1: 1 weight ratio and added to the reaction tank, the conditions of the reaction tank of 3 ~ 8atm It is made of powder by filtering and removing cyclohexane by filtering what was prepared by stirring and mixing for 30 to 40 minutes at 130 to 150 rpm while maintaining pressure and a temperature of 150 to 300 ° C.

20 to 40 wt% of LDPE for agricultural waste vinyl, 20 to 50 wt% for agricultural waste vinyl of HDPE, and 30 to 60 wt% of rubber are powdered, and the rubber is a waste fluorine rubber having an average particle size of 100 μm. .

Hereinafter, a detailed description of the above technical configuration will be made.

asphalt

Normal asphalt is a mixture of several compounds that can be obtained at the bottom of petroleum refining. Generally, a mixture of aromatics, maltene, asphaltene, and aliphatic asphalt is the final residue of light oil removed from constituents of petroleum. Natural asphalt obtained naturally and petroleum asphalt obtained after purification Separated by.

Asphalt is divided into several grades on the basis of its rigidity. The penetration property, which is the standard property of this grade, is an empirical test and is based on the asphalt property at 25 ° C. As a result, asphalt grades have been classified without considering the high and low temperature asphalt behavior experienced by asphalt pavement. Asphalt penetration ratings are specified in KS M 2201, which has five standard penetration rating ranges. 40 ~ 50, 60 ~ 70, 85 ~ 100, 120 ~ 150 and 200 ~ 300 is the reference grade of road paving asphalt, the higher the penetration, the softer the asphalt, the higher the probability of plastic deformation. However, too low penetration may have high resistance to plastic deformation, but there is a risk of cracking asphalt in cold weather. In Korea, only penetration grades 85 to 100 (AP-3) and 60 to 70 (AP-5) are produced and used.

In manufacturing asphalt using agricultural waste vinyl as a substitute for asphalt, when the amount of asphalt used is less than 70wt%, the amount of used asphalt substitute is relatively increased, resulting in a sharp drop in the physical properties of the asphalt, exceeding 90wt%. In this case, it is preferable that the amount of asphalt used is maintained in the range of 70 to 90 wt% because the content of the asphalt substitute material is relatively reduced, so it is difficult to expect the economic benefits and environmental improvement effect to be obtained by using the substitute material.

Asphalt substitute

The LDPE is one of the most used resins in Korea along with HDPE, PP and PVC. LDPE is colorless and transparent, has good cold resistance, good electrical insulation, chemical resistance, etc., so it is widely used in household containers, electrical insulation parts, packaging films and envelopes, communication cables, agricultural films, and containers. In total, about 10% of agricultural film is used.

The HDPE is one of the most used resins in Korea with LDPE, PP, PVC. It takes about 4% of the total real demand for agriculture, less than LDPE, but more overall. The appearance overlaps with LDPE but there are some differences.

PP is less than all but PP is used more than the fields of LDPE and HDPE. PP is similar in appearance to PE, but is hard and has excellent high-frequency electrical insulation. It also has strong tensile strength and repeated bending. However, there are also weak points to shock. It is widely used in the body of electric appliances such as vacuum cleaners, tableware, tool boxes, high-frequency insulation parts, and is used for mainstream crate such as beer.

The EVA is produced by copolymerizing an ethylene monomer and a vinyl acetate monomer. EVA has a variety of VA content from 0.5 to 90wt%, and as the VA content increases, the crystallinity becomes lower and soft. EVA has excellent adhesiveness, fluidity, weather resistance, and compatibility with other components, and is used as a packaging film, coating material, molding material, etc.For electrical insulation, heat shrinkable insulation material, semiconductive insulation jacket, flame retardant insulation material, wire insulation material, etc. It is used.

The PVC has a hard, colorless and transparent property at room temperature and can be colored. Since the resin itself contains chlorine, it may generate chlorine during combustion, and plasticizers and heat stabilizers used to soften hard properties may be harmful. However, its use is very wide, so that hard products are used as pipes, rain gutters, hard films, etc., while soft products are used for agricultural films, packaging films, plastic bottles, composition leather, and wire coating.

When the agricultural waste vinyl used as the asphalt substitute is applied to the asphalt as it is, not only the physical properties of the asphalt fall, but also problems such as agglomeration of the agricultural waste vinyl occur. Therefore, in order to utilize the agricultural waste vinyl as an alternative to asphalt, a certain treatment process is required.

In the present invention, in order to utilize agricultural waste vinyl as an alternative to asphalt, it is subjected to a powdering process of 30 ~ 50㎛.

The powdering process utilizes the atomization reaction of the polymer resin in which the cyclohexane penetrates into the polymer resin which becomes ductile at high temperature.

That is, the powdering process first collects the agricultural waste vinyl, then goes through a washing process to remove foreign matters, and then dry, and melt-extruded the agricultural waste vinyl thus dried to produce pellets.

Thus prepared pellets and cyclohexane (cyclohexane) is mixed in a 1: 1 weight ratio and then put into a reactor. At this time, while maintaining the pressure of the reactor 3 ~ 8 atm and the temperature of 150 ~ 300 ℃ stirring and mixing at 130 ~ 150rpm for 30 to 40 minutes to cause the miniaturization reaction.

After the refining reaction is completed, the asphalt substitute in the form of fine powder is prepared by drying at room temperature.

When the reaction time is less than 30 minutes, the atomization reaction may not be properly made, so that the atomization of agricultural waste vinyl may not be properly performed, and when it exceeds 40 minutes, the reaction time is meaningless because a large change of the atomization does not occur. It is preferable to keep in the range of 30-40 minutes.

In addition, the asphalt substitute may be used in a form in which rubber is added to waste vinyl in addition to agricultural waste vinyl. More specifically, a mixture formed by adding rubber to agricultural waste vinyl powder of LDPE and agricultural waste vinyl powder of HDPE is used.

When the content of the asphalt substitute is less than 10wt%, it is difficult to expect an effect in terms of resource recycling and environmental improvement expected by recycling waste resources, and it is difficult to expect the improvement of strength characteristics expected by using agricultural waste vinyl. When the content of the asphalt substitute is more than 30wt%, there is a problem that the agricultural waste vinyl is present in the aggregate form in the asphalt, the amount of the asphalt substitute is preferably maintained in the range of 10 ~ 30wt%.

As described above, the asphalt substitute material is to use only waste vinyl for agriculture or to use a mixture formed by mixing a certain amount of rubber to waste agricultural vinyl, and more specifically, 20-40 wt% of LDPE for agricultural waste vinyl and HDPE. 20 to 50 wt% of agricultural waste vinyl and 30 to 60 wt% of rubber are used.

The use of the rubber has the effect of reducing the damage due to plastic deformation of the asphalt mixture to improve the life extension effect, when the amount of the rubber used is less than 30wt%, it is difficult to expect the effect of using the rubber, 60wt When the amount is exceeded, the amount of waste vinyl used for agriculture is relatively decreased, which is not suitable for the purpose of the present invention. Therefore, the amount of the rubber used is preferably maintained in the range of 30 to 60 wt%.

More preferably, a mixture composed of 30 wt% of agricultural waste vinyl of LDPE, 20 wt% of agricultural waste vinyl of HDPE, and 50 wt% of rubber is used as an asphalt substitute.

The rubber used for the asphalt substitute is fluorine rubber, and the fluorine rubber generally exhibits excellent physical resistance to heat resistance and chemical resistance, and is mainly used as an automotive part material because of the characteristics of such fluorine rubber. It is widely used in the field that is resistant to heat and needs to be resistant to various chemicals such as solvents, acids, bases, oils, etc., and its usage is increasing as the industry develops.

The waste fluorine rubber is a powder having an average particle size of 100 μm, and has an effect in terms of elasticity increase by torture powder and crack prevention at high and low temperatures utilizing the characteristics of fluorine rubber.

As a stirring condition after the addition of the asphalt substitute material, when the stirring temperature is less than 150 ℃, the stirring speed is less than 4,000rpm, the stirring speed is less than 30 minutes, it is difficult to achieve a uniform mixing, the stirring temperature exceeds 170 ℃ , If the stirring speed exceeds 4,500rpm, and the stirring time exceeds 1 hour 30 minutes, there is no significant change in the stirring effect, it is uneconomical.

Then, BP (Benzophenone, C ₆ H ₅ COC ₆ H ₅ ), which is a photoinitiator, is added to 0.5 ~ 3wt% of the total content in the asphalt after the stirring process and undergoes UV curing.

UV rays, UV rays, visible rays, and ultraviolet rays are simultaneously emitted from the sunlight, which is natural light. Ultraviolet light is a general term for a wide range of electromagnetic waves with wavelengths ranging from about 220 to 450 nm, and extremely short ultraviolet light is hardly distinguished from X-rays. In short, it refers to the invisible light that appears outside of the purple to visible light when the spectrum of the solar tube passes through the prism. UV is classified as UV A, UV B, UV C, and UV V depending on the wavelength, but it is classified as near ultraviolet in the violet, near ultraviolet in the far distance, and middle ultraviolet in the middle.

This can be classified numerically into near ultraviolet (wavelength 290 nm or more), crystal range UV (crystal transmission 290 to 190 nm), Schumann line (190 to 120 nm), Lyman line (120 to 60 nm), and millicon (60 nm or less). Alternatively, UV having a wavelength of 190 nm or less is also referred to as far ultraviolet. Since ultraviolet rays are strong in chemical action, infrared rays are sometimes referred to as chemical rays in response to heat rays.

UV curing means hardening paint or ink in a liquid state using ultraviolet rays, and hardening occurs when the strong energy of ultraviolet rays emitted from an ultraviolet lamp gives energy for initiating a chemical reaction to a photoinitiator. Commonly used in inks and paints, monomers or oligomers are instantaneously polymerized by energized photoinitiators. The ultraviolet light source used industrially is not pure ultraviolet light, among which visible light and infrared light are mixed, and mainly electromagnetic waves of 250-450 nm wavelength are usefully used. In principle, any of the light sources emitting ultraviolet rays is the same, and eventually, a material (mercury) having a structure that easily emits electromagnetic waves in the ultraviolet region is vaporized when electric energy is supplied from the outside. The advantage of UV curing is that it can be cured at low temperatures, and the energy is saved because of the fast curing speed. In particular, the operation management is simple, and in the case of paint has the effect of increasing the surface tension and hardness.

Mercury lamp was used as UV curing agent, and the specifications are lamp capacity (W) 1,000 lamp voltage (V) 130, lamp current (A) 8.3, diameter (mm) 24.5, electric field (mm) 225, emitter (mm) 110 The irradiation dose is 18 mW / cm 2 at a wavelength of 300 nm to 450 nm. The UV curing time is run for 30 to 90 seconds.

UV curing by using the photoinitiator to increase the viscosity and viscoelastic stress of the asphalt, if the amount is less than 0.5wt% UV curing can not be easily achieved, if more than 3wt% UV curing reaction There is no significant change in the meaningless, so it is uneconomical. Therefore, the amount of the photoinitiator is preferably maintained in the range of 0.5 ~ 3wt%.

As described above, the asphalt mixture manufacturing method using the agricultural waste vinyl according to the present invention by presenting a technology that can utilize the agricultural waste vinyl, it can effectively treat the agricultural waste vinyl causing a myriad problems such as environmental pollution. By providing a viable technology, the industrial applicability is high.

Claims (3)

Heating the asphalt,
Adding an asphalt substitute material composed of any one or two or more resins selected from LDPE, HDPE, EVA, and PVC to the asphalt;
The asphalt; Asphalt replacement material made of resin;
An asphalt heating step of melting AP-5 asphalt having a penetration of 60 to 80 by heating to 130 ° C.,
30 to 1 hour at a speed of 4,000 to 4,500 rpm at a temperature of 150 to 170 ° C. by adding 10 to 30 wt% of an asphalt substitute having a powder size of 30 to 50 μm to 70 to 90 wt% of the molten asphalt in the asphalt heating step. Stirring for 30 minutes,
After adding the photoinitiator Benzophenone (BP, C ₆ H ₅ COC ₆ H ₅ ) to the asphalt after the stirring process, 0.5 to 1wt% based on the total weight of the asphalt mixed with the asphalt substitute,
It is made through a step of irradiating UV ultraviolet rays for 30 to 90 seconds at a wavelength (nm) 300 ~ 450, the irradiation dose 18mW / ㎡,
The asphalt substitute material is any one or a mixture of two or more selected from low density polyethylene (LDPE), HDPE (high density polyethylene), EVA (Ethylene vinyl acetate), PVC (Polyvinyl chloride) and agricultural waste vinyl (waste vinyl) After washing and drying the composition to melt pellets to prepare a pellet, the prepared pellet and cyclohexane (cyclohexane) is mixed in a 1: 1 weight ratio and put into the reaction tank, the conditions of the reactor 3 to 8 atm pressure And the mixture prepared by stirring melt mixing at 130 ~ 150rpm for 30 to 40 minutes while maintaining the temperature of 150 ~ 300 ℃ to remove the cyclohexane, and then dried at room temperature to produce a powder,
The asphalt substitute material is an asphalt mixture using agricultural waste vinyl, characterized in that it is composed of 20-40 wt% of agricultural waste vinyl powder of LDPE, 20-50 wt% of agricultural waste vinyl powder of HDPE, and 30-60wt% of waste fluorine rubber. Manufacturing method.
delete The method according to claim 1,
Waste fluorine rubber is a method for producing asphalt mixture using waste vinyl, characterized in that the average particle size of 100㎛.