JP2000226468A - Fractionation method for fractionating vinyl chloride resin material according to stabilizer in vinyl chloride resin material and method for recycling vinyl chloride resin material - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method for recycling a vinyl chloride resin material which can readily and quickly identify a vinyl chloride resin material containing a lead type compound stabilizer and a vinyl chloride resin material containing a tin type compound stabilizer by the absorption spectrum spectroscopy using near infrared rays to effect material recycling of vinyl chloride resin materials, and a fractionation method for fractionating vinyl chloride resin materials according to the stabilizers in the vinyl chloride resin materials. SOLUTION: The stabilizer in each vinyl chloride resin material is identified by comparing the absorption spectrum pattern of a lead type compound stabilizer present in a vinyl chloride resin material with that of a tin type compound stabilizer present in another vinyl chloride resin material by the absorption spectrum spectroscopy using near infrared rays with a wavelength of about 1.15 to about 1.28 μm. Further, by applying this identification method of stabilizers, material recycling of vinyl chloride resin materials is carried out.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for separating a vinyl chloride resin material by a stabilizer in the vinyl chloride resin material and a method for recycling the vinyl chloride resin material.

[0002]

2. Description of the Related Art At present, the amount of waste plastic generated is increasing year by year at about 8 million tons per year. Considering the total energy consumed from the production of petroleum raw materials to products, it is a preferable form of recycling to use a material cycle, but at present it is largely treated by incineration and landfill, which is a major social problem .

[0003] Since vinyl chloride resin generates very toxic dioxin depending on combustion conditions, at present the treatment mostly depends on landfill treatment. However, the landfill process has a serious problem of shortage of landfill sites.

[0004] Therefore, in order to effectively recycle the vinyl chloride resin, it is necessary to first identify and separate and separate the vinyl chloride resin from the waste plastics. The easiest identification method is a method in which a copper wire is burned and discriminated by a flame reaction. However, this method has the disadvantages that non-destructive measurement cannot be performed because a sample that generates dioxin by combustion is burnt, and the measurement time is long.

Further, in order to carry out the material cycle of the vinyl chloride resin, it is necessary to identify the type of the heavy metal compound stabilizer contained in the vinyl chloride resin. However, the current absorption spectrum spectroscopy using near-infrared rays cannot identify the type of stabilizer contained in vinyl chloride, and the analysis requires a different analysis method. Since a long time and high cost are required, there has been a serious problem that the material cycle of the chlorinated resin separated and recovered cannot be performed.

[0006]

DISCLOSURE OF THE INVENTION The present invention has been made to solve the above problems, and an object of the present invention is to provide an infrared spectroscopy using near infrared rays.
A vinyl chloride resin material containing a lead-based compound stabilizer and a vinyl chloride resin material containing a tin-based compound stabilizer can be easily and quickly distinguished from each other. An object of the present invention is to provide a method of recycling a vinyl chloride resin material capable of performing a material cycle of the resin material, and a separation method for separating the vinyl chloride resin material by a stabilizer in the vinyl chloride resin material.

[0007]

The invention according to claim 1 is
Irradiating the vinyl chloride resin material with near-infrared light having a wavelength of about 1.15 to about 1.28 microns; obtaining an absorption spectrum pattern by reflected light from the irradiated vinyl chloride resin material; Comparison of the spectral pattern with the absorption spectrum pattern data of the lead compound stabilizer contained in the vinyl chloride resin material and the absorption spectrum pattern data of the tin compound stabilizer contained in the vinyl chloride resin material stored in the computer A step of identifying a stabilizer in the vinyl chloride resin material; and a step of separating the vinyl chloride resin material according to the stabilizer in the vinyl chloride resin material based on the identification result. This is another separation method for separating a vinyl chloride resin material.

According to a second aspect of the present invention, in a separation method for separating a vinyl chloride resin material for each stabilizer in the vinyl chloride resin material, an acousto-optic tunable wavelength filter is used in the step of identifying the stabilizer. It becomes.

According to a third aspect of the present invention, there is provided a vinyl chloride resin having an absorption spectrum pattern obtained by irradiating a wide variety of plastic materials with near-infrared light having a wavelength of about 1.3 to about 2.4 microns and storing the absorption spectrum pattern. Comparing the absorption spectrum pattern data of the material with a vinyl chloride resin material; and applying a wavelength of about 1.15 to about 1.
Absorption spectrum pattern obtained by irradiating near-infrared light of 28 microns, absorption spectrum pattern data of a lead compound stabilizer contained in a vinyl chloride resin material stored in a computer and tin contained in the vinyl chloride resin material Comparing the absorption spectrum pattern data of the base compound stabilizer to identify the stabilizer in the vinyl chloride resin material; and separating the vinyl chloride resin material according to the stabilizer in the vinyl chloride resin material based on the identification result. And a step of recycling the vinyl chloride resin material.

According to a fourth aspect of the present invention, in the method for recycling a vinyl chloride resin material, an acousto-optic variable wavelength filter is used in the step of identifying the stabilizer.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail.

Dimensions: diameter 60 mm x thickness 5 mm x length 50
A pipe made of a vinyl chloride resin containing a lead-based compound stabilizer (mm) and a pipe made of a vinyl chloride resin containing a tin-based compound stabilizer having the same dimensions (sample B) were prepared. The wavelength of each of the sample A and the sample B;
Irradiating near infrared rays of about 1.15 to about 1.28 microns,
The rate of absorption was measured.

[0013] The absorption spectrum pattern thus obtained is different between the lead compound stabilizer and the tin compound stabilizer contained in the vinyl chloride resin, and the lead compound stabilizer and the tin compound stabilizer are used. Agent. 1 to 4, the horizontal axis represents wavelength (microns) and the vertical axis represents absorbance. FIG. 1 shows an absorption spectrum of a vinyl chloride resin (sample A) containing a lead compound stabilizer. As shown in the figure, it can be seen that the absorption peak of the vinyl chloride resin containing the lead compound stabilizer has an absorption peak on the low wavelength side. FIG. 2 shows an absorption spectrum of a vinyl chloride resin (sample B) containing a tin compound stabilizer. As shown in the figure, it can be seen that the absorption peak of the vinyl chloride resin containing the tin compound stabilizer is hardly observed. In this experiment, 20 measurements were carried out on the sample, and all showed good reproducibility, and a clear difference was observed in the absorption spectrum pattern between the two samples.

On the other hand, when a near infrared ray (1.3 to 2.4 microns) is irradiated onto a plastic material while changing the wavelength, and the absorption ratio is measured, different absorption spectrum patterns are obtained for each type of plastic material. Thus, the type of plastic material can be identified from the absorption spectrum pattern by utilizing the fact that this absorption spectrum pattern differs for each type of plastic material.

First, the plastic material is irradiated with near-infrared rays while changing the wavelength in the range of 1.3 to 2.4 microns, and the ratio of absorption is measured to identify the vinyl chloride resin from the plastic material. Subsequently, about 1.15 to about 1.28
By irradiating near-infrared rays while changing the wavelength in the range of microns, a lead compound stabilizer and a tin compound stabilizer contained in the vinyl chloride resin are distinguished. Thus, the vinyl chloride resin can be separated for each stabilizer. As a result, a material cycle can be performed.

In this embodiment, first, a vinyl chloride resin material is identified from various plastic materials. In this case, an absorption spectrum pattern obtained by irradiating various plastic materials with near infrared rays having a wavelength of 1.3 to 2.4 microns is compared with absorption spectrum pattern data of a vinyl chloride resin stored in a computer in advance. . Thus, a plastic material having an absorption spectrum pattern that matches the absorption spectrum pattern data of the vinyl chloride resin stored in the computer is identified as the vinyl chloride resin material.

Next, a wavelength of about 1.15 is applied to the vinyl chloride resin material.
Irradiation with near-infrared light of about 1.28 microns gives an absorption spectrum pattern. Then, the obtained absorption spectrum pattern is compared with the absorption spectrum pattern data of the lead compound stabilizer and the tin compound stabilizer in the vinyl chloride resin material already stored in the computer. Thus, the lead compound stabilizer and the tin compound stabilizer contained in the vinyl chloride resin material, respectively, depend on whether or not the absorption spectrum pattern data of the lead compound and the tin compound stored in the computer match. Be identified.

In the above embodiment, various plastic materials are irradiated with near infrared rays having a wavelength of about 1.3 to about 2.4 microns to identify the vinyl chloride resin. Irradiating near-infrared rays of 15 to about 1.28 microns to discriminate between a lead compound stabilizer and a tin compound stabilizer and to include a vinyl chloride resin material containing the lead compound stabilizer and a tin compound stabilizer Although it was classified into a vinyl chloride resin material, the present invention is not limited to this example, and any plastic material is irradiated with near-infrared light having a wavelength of about 1.3 to about 2.4 microns. By comparing the absorption spectrum pattern data of each plastic material stored in the computer with each other, the type of plastic material is identified, and a wave suitable for identifying the heavy metal stabilizer contained in the plastic material. Heavy metal stabilizers can separate separate the plastic material by irradiating a near-infrared wavelength Select.

On the other hand, FIGS. 3 and 4 show that the vinyl chloride resin material containing a lead compound stabilizer and the vinyl chloride resin material containing a tin compound stabilizer have a wavelength of about 1.6 to about 2.4 microns. 4 shows an absorption spectrum when irradiated with infrared light. As can be seen from the figure, there is hardly any difference in the absorption spectrum patterns between the two materials.

Here, a device for measuring the absorption spectrum to discriminate between the lead compound and the tin compound contained in the vinyl chloride resin, or a spectroscopic device for measuring the absorption spectrum to discriminate the type of plastic is A plastic type discriminator (trade name; Plascan), which was previously invented by the applicant, was used. The spectroscopic analyzer has the following configuration.

That is, in FIG. 5, in the spectroscopic analyzer, the high frequency generated by the high frequency generator 3 is applied to the high frequency oscillator 2 to apply acoustic vibration to the birefringent crystal spectroscopic element 1. Birefringent crystal spectroscopy element 1 with acoustic vibration
Ray b2 obtained by entering light b1 from the light source 7 into the
Is irradiated on the object 8 which is an organic compound. Reflected light b
3 is received by the light receiver 9, and the absorption spectrum of the received reflected light is patterned. The patterned data is compared and collated with the absorption spectrum pattern of the organic compound previously stored in the data file. Thus, the material of the organic compound of the device under test 8 can be determined.

FIG. 6 is a diagram for explaining the temperature correction of the spectroscopic analyzer. In the figure, the same reference numerals as those in FIG. 5 indicate the same components. Here, a temperature correction device that avoids a temperature drift of the birefringent crystal spectroscopy element 1 is employed.
The apparatus comprises a temperature measuring element 4 for measuring the temperature of the birefringent crystal spectroscopic element 1, a high-frequency control signal superimposing circuit 5 for correcting a high frequency applied to a high-frequency oscillator based on the measurement result of the temperature measuring element 4. Is provided. a1 is a frequency control signal for switching a spectral wavelength for sampling a spectrum of spectroscopic analysis, a2 is a frequency control correction signal based on the temperature of the birefringent crystal spectroscopic element 1, and a3 is a superposition of signals a1 and a2. This is a frequency control superimposed signal obtained as a result.

[0023]

According to the present invention, a vinyl chloride resin material containing a lead compound stabilizer and a vinyl chloride resin material containing a tin compound stabilizer can be easily and quickly distinguished by absorption spectrum spectroscopy using near infrared rays. Therefore, the material cycle of the vinyl chloride resin material, which could not be performed conventionally, can be performed. Therefore, the lead compound can be prevented from being taken out of the recycling system, and a large environmental burden deterrent effect can be obtained.

[Brief description of the drawings]

FIG. 1 is a diagram showing an absorption spectrum pattern when a near-infrared ray having a wavelength of about 1.15 to about 1.28 microns is irradiated on a vinyl chloride resin containing a lead-based compound stabilizer.

FIG. 2 is a view showing an absorption spectrum pattern when a near-infrared ray having a wavelength of about 1.15 to about 1.28 μm is irradiated on a vinyl chloride resin containing a tin-based compound stabilizer.

FIG. 3 is a diagram showing an absorption spectrum pattern when a near-infrared ray having a wavelength of about 1.6 to about 2.4 microns is irradiated to a vinyl chloride resin containing a lead-based compound stabilizer.

FIG. 4 is a diagram showing an absorption spectrum pattern when a near-infrared ray having a wavelength of about 1.6 to about 2.4 microns is irradiated to a vinyl chloride resin containing a tin-based compound stabilizer.

FIG. 5 is a diagram schematically showing a spectroscopic analyzer according to the present invention.

FIG. 6 is a diagram schematically illustrating a temperature correction device that performs a temperature correction of the spectroscopic analyzer of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Birefringence crystal spectroscopy element 2 High frequency oscillator 3 High frequency generator 4 Temperature measuring element 5 Frequency control signal superimposing circuit a1 Frequency control signal a2 Frequency control correction signal a3 Frequency control superimposing signal

Claims (4)

[Claims] 1. irradiating a near infrared ray having a wavelength of about 1.15 to about 1.28 microns to a vinyl chloride resin material; and obtaining an absorption spectrum pattern by reflected light from the irradiated vinyl chloride resin material; The obtained absorption spectrum pattern and the absorption spectrum pattern data of the lead compound stabilizer contained in the vinyl chloride resin material stored in the computer and the absorption spectrum pattern of the tin compound stabilizer contained in the vinyl chloride resin material Comparing the data to identify the stabilizer in the vinyl chloride resin material; and separating the vinyl chloride resin material according to the stabilizer in the vinyl chloride resin material based on the identification result. Separation method for separating vinyl chloride resin material by stabilizer in the material. 2. The method according to claim 1, wherein the step of identifying the stabilizer comprises using an acousto-optic tunable wavelength filter. For sorting. 3. An absorption spectrum pattern obtained by irradiating a wide variety of plastic materials with near-infrared light having a wavelength of about 1.3 to about 2.4 microns, and stored absorption spectrum pattern data of a vinyl chloride resin material. Identifying the vinyl chloride resin material by comparing the vinyl chloride resin material with near-infrared light having a wavelength of about 1.15 to about 1.28 microns and storing the absorption spectrum pattern in a computer. Comparing the absorption spectrum pattern data of the lead compound stabilizer contained in the vinyl chloride resin material with the absorption spectrum pattern data of the tin compound stabilizer contained in the vinyl chloride resin material. A step of identifying a stabilizer; and a step of separating the vinyl chloride resin material for each stabilizer in the vinyl chloride resin material based on the identification result. How to recycle vinyl chloride resin. 4. The method according to claim 4, wherein the step of identifying the stabilizer comprises using an acousto-optic tunable wavelength filter.