JP2001114931A - Preparation of dechlorinated resin - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a method of preparing a dechlorinated resin from a chlorine-containing resin which comparatively simply enables treatment compared to the conventional techniques by utilizing an inorganic substance and can fully effect dechlorination. SOLUTION: A method of preparing a dechlorinated resin comprises allowing a mechanical energy to act on a mixture of a chlorine-containing resin with an inorganic powder substance having not less than 20 wt.% calcium or iron compound, preferably at a molar ratio of the inorganic powder substance to the powder substance plus the chlorine-containing resin of 0.1-0.9 to remove the chlorines in said chlorine-containing resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for producing a desalted resin, with particular attention to recycling of the resin.

[0002]

2. Description of the Related Art At present, methods for treating chlorine-containing resins are:
Methods such as (1) landfill, (2) incineration, and (3) recycling have been adopted. Landfill methods are different from those in Europe and the United States, and the depletion of disposal sites has become a problem in Japan.
Increasing the proportion of means of volume reduction by incineration,
This has various problems such as environmental pollution due to generation of chlorine gas, equipment corrosion, and dioxin generation.

On the other hand, in recent years, methods such as material recycling, thermal recycling, and chemical recycling have been developed as the recycling methods (3).
There are various problems such as complicated processing equipment. The root cause of the above problems is the chlorine component contained in the chlorine-containing resin. In the chlorination, in JP-A-11-61147, a chlorine-containing resin
A method is disclosed in which after pyrolysis treatment is performed at about 00 ° C. to 450 ° C., chlorine and hydrogen chloride gas generated are removed, and the residue is converted into a fuel as an oil. However, these methods have problems such as the necessity of high energy and the inevitable complication of processing equipment.

[0004]

SUMMARY OF THE INVENTION In view of the above-mentioned problems in the processing of the conventional chlorine-containing resin, the present invention makes it possible to perform the processing relatively easily by using an inorganic powder material as compared with the prior art. It is an object of the present invention to provide a method for producing a desalinated resin from a chlorine-containing resin which is capable of sufficiently dechlorinating.

[0005]

In order to achieve the above object, according to the present invention, there is provided a method for producing a mixture of a chlorine-containing resin and an inorganic powder material having a calcium or iron compound in an amount of 20% by weight or more. The present invention provides a method for producing a desalted resin that removes chlorine in the chlorine-containing resin by applying a mechanical energy. The present invention according to claim 2 provides:
2. The inorganic powder material / (inorganic powder material + chlorine-containing resin) has a molar ratio of 0.1 to 0.9.
And a method for producing the desalted resin described above. Claim 3
The present invention as described above provides the method for producing a desalted resin according to claim 1 or 2, wherein the chlorine-containing resin is polyvinyl chloride.
The present invention according to claim 4 provides a method for producing a desalted resin according to claim 3, wherein polyvinyl chloride is waste. Hereinafter, the present invention will be described in more detail.

[0006] The chlorine-containing resin in the present invention refers to a resin having a chlorine element in a resin skeleton, and specifically, a polychlorinated resin which may be chlorinated or a copolymer of vinyl chloride. Refers to vinyl. The polyvinyl chloride may be a resin immediately after production, a molded product immediately after molding, or a molded product immediately after molding.
As described, it may be used resin or resin waste, or waste containing unnecessary substances such as burrs and runners generated at the time of molding.In this case, the method for producing a desalted resin of the present invention may be a chlorine-containing waste. It is highly useful as a recycling method for the contained resin.

The inorganic powder substance in the present invention is not particularly limited as long as the powder contains a calcium or iron compound in a component ratio of 20% by weight or more. The content is preferably at least 30% by weight. Naturally, substances consisting solely of calcium or iron compounds and single compositions thereof are also included.

An inorganic powder substance containing less than 20% by weight of a calcium or iron compound is not preferred because the efficiency of dechlorination of a chlorine-containing resin by treatment is poor. The compounds referred to herein include oxides, hydroxides, and ionic compounds, and iron includes metallic iron. Examples of the content form include a case where the compound is contained as a mixture or via a chemical bond. As a specific example, Ca
O, Ca (OH) 2, CaCO3, CaSO4, Fe2 O
3, Fe3 O4, Fe (OH) 3 and the like.

The particle diameter of the chlorine-containing resin and the inorganic powdery substance is not particularly limited, but from the viewpoint of utilization of mechanical energy, the average particle diameter is preferably 0.0001 to 10 mm, more preferably 0.0001 to 10 mm. 1 mm.
The mixing ratio between the chlorine-containing resin and the inorganic powder material is not particularly limited, but as described in claim 2, the molar ratio is inorganic powder material / (inorganic powder material + chlorine-containing resin).
Is preferably 0.1 to 0.9. If it is less than 0.1, the dechlorination efficiency is poor, which is not preferable. On the other hand, if it is more than 0.9, the amount of the chlorine-containing resin in one treatment decreases, and the treatment efficiency decreases, which is not preferable. A more preferred mixing ratio is 0.2 in the above molar ratio.
~ 0.8.

The mechanical energy acting on the mixture of the chlorine-containing resin and the inorganic powdery substance is not particularly limited, and includes, for example, energy due to compressive force, shear force, impact force, frictional force and the like. The method of applying the mechanical energy is not particularly limited, and for example, the method can be performed using a pulverizer generally used for the purpose of pulverization.

[0011] Examples of such a pulverizing device include a ball media mill in which impact, friction, compression, shearing, and the like are combined, such as a ball mill, a vibration mill, a planetary mill, and a media stirring type mill; a roller mill; . In addition, it is also possible to use a jet pulverizing apparatus mainly for impact and attrition. Among them, a ball-medium type mill is preferable because mechanical energy can be effectively applied to the mixture mechanically.

The amount of the mechanical energy is not particularly limited. However, if the amount is too small, the chlorine in the chlorine-containing resin cannot be sufficiently removed. Such as severe wear of containers and containers, and disadvantages in production such as cost. In particular,
For example, using a planetary mill having two stainless steel pots, applying mechanical energy for 15 minutes to 3000 minutes.

As described above, in the present invention, chlorine is chemically transferred to the inorganic powder material side by applying mechanical energy to the mixture of the chlorine-containing resin and the inorganic powder material. It is presumed that by doing so, a mixture of the desalted resin and the chlorine-containing inorganic powder material is produced.

[0014]

EXAMPLES The present invention will be described in more detail with reference to the following examples, but the present invention is not limited to these examples. (Examples 1 to 5 and Comparative Examples 1 to 5) As a chlorine-containing resin, an average pipe diameter of 1 obtained from polyvinyl chloride was used.
mm (ground polyvinyl chloride content: about 95% by weight, the remaining 5% by weight is a lubricant such as metal soap, a filler such as calcium carbonate, a stabilizer such as organic tin and organic lead, and other coloring agents, etc. Consists of).

A mixture of the chlorine-containing resin and the various inorganic powder substances shown in Table 1 at a predetermined ratio was subjected to mechanical energy for 6 hours, and then the dechlorination rate was measured.
The results are shown in Table 1. To apply mechanical energy to the mixture of the chlorine-containing resin and the inorganic powder material, two stainless steel pots (capacity: 50 cm3) are placed on a desk that rotates horizontally (clockwise) and each individual pot is rotated. The pot used was a planetary mill capable of rotating counterclockwise at the same rotational speed as the desk.

The revolution radius of the pot was 70 mm, and the rotation speed was 600 rpm. The pot was charged with 7 stainless steel balls having a diameter of 15 mm and 3 g of the mixture, and treated at room temperature. In the processing time, the operation was stopped for 30 minutes after the operation for 15 minutes to prevent an excessive rise in the temperature in the mill.

The dechlorination ratio was determined as follows by measuring the amount of chloride ions in the filtrate obtained by washing and filtering the powder after treatment with excess water by ion chromatography. Dechlorination rate (%) = amount of chloride ion contained in filtrate after treatment × 100 / theoretical amount of chloride ion in chlorine-containing resin to be treated

[0018]

[Table 1]

[0019]

The method for producing a desalted resin according to the present invention is constituted as described above, in which mechanical energy is applied to a mixture of a chlorine-containing resin and an inorganic powder material without applying heat or the like. As a result, a mixture of the desalted resin and the chlorine-containing inorganic powdery substance is generated with relatively low energy and without requiring complicated processing equipment. Here, if the chlorine-containing inorganic powdery substance is soluble in water, the desalted resin can be separated by washing and filtration, and if not soluble in water,
The treated desalted resin can be dissolved in an organic solvent and separated by extraction. Since the desalted resin separated in this way is basically a hydrocarbon, it can be recycled as a fuel. Therefore, the present invention is expected as an environmentally friendly recycling method for chlorine-containing resins. In particular, when the chlorine-containing resin is polyvinyl chloride, which is produced and consumed in large quantities in Japan, the usefulness of the recycling method by the method for producing a desalted resin of the present invention, including the case of waste. Is expected to be large.

Claims (4)

[Claims] 1. A method of removing chlorine in a chlorine-containing resin by applying mechanical energy to a mixture of a chlorine-containing resin and an inorganic powder material having a calcium or iron compound in an amount of 20% by weight or more. A method for producing a desalted resin. 2. The method for producing a desalted resin according to claim 1, wherein the molar ratio of inorganic powder substance / (inorganic powder substance + chlorine-containing resin) is 0.1 to 0.9. . 3. The method for producing a desalted resin according to claim 1, wherein the chlorine-containing resin is polyvinyl chloride. 4. The method for producing a desalted resin according to claim 3, wherein the polyvinyl chloride is a waste.