JPH0710346B2 - Adsorption material - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention is characterized in that a resin composition containing a zeolite adsorbent in an amount of 1 to 50% by weight is extruded into a film, and then stretched and split. TECHNICAL FIELD The present invention relates to a method for producing an adsorbent material having high efficiency and an adsorbent material.

(Prior art) Typical examples of adsorbents include activated carbon and activated clay, which are used for deodorization and decolorization, etc., and in terms of adsorption effect, improve contact with gas or liquid. Often used in powder, granular, granular, or lump form.

(Problems to be Solved by the Invention) However, these forms still have problems such as scattering and runoff, and they are often inconvenient to handle, and have a drawback that their applications are limited. In particular, activated carbon, which has excellent adsorption ability, is black and causes a problem of contamination.

(Means for Solving the Problem) The present inventors have made diligent efforts to develop a useful adsorbent material that retains the adsorbent without reducing the adsorbability of the adsorbent as much as possible. It was found that the compound was obtained by blending the above with a synthetic resin, extruding this into a film, and then stretching and splitting.

The method for producing an adsorbent material and the adsorbent material of the present invention will be described in detail below.

(Function) Zeolite is an aluminosilicate having a three-dimensional network structure containing an alkali metal and an alkaline earth metal, contains water that can be freely desorbed in the crystal, has the property of adsorbing gas and liquid, and also exhibits ion exchange capacity. Therefore, it is a useful adsorbent after activated carbon. The present invention uses this zeolite as a main component. The zeolite-based adsorbent in the present invention includes natural zeolite and synthetic zeolite as zeolite. Natural zeolite is inexpensive, easy to use, and useful. It is also possible to improve the adsorption capacity of natural zeolite by calcination or sulfuric acid treatment. Further, zeolite having ferric hydroxide and calcium hydroxide added thereto is more effective as one having further improved adsorption capacity of zeolite.

When a study was made on a useful form of retaining the adsorbent without reducing the adsorption capacity of the zeolite-based adsorbent in the present invention as much as possible, 1-50 wt% of the zeolite-based adsorbent
By admixing it with a synthetic resin, extruding this into a film, and then stretching and splitting it, an adsorbent material with a small decrease in adsorptive capacity was obtained. The adsorbent material in the present invention is in a fibrous form and is very useful in handling and application.

The synthetic resin in the present invention is a stretchable crystalline polymer such as polyolefin, polyamide, polyester, etc., and particularly polypropylene or / or polypropylene having excellent stretch splitting property.
And polyethylene polyolefins are most suitable.

Zeolite-based adsorbent compounded in the synthetic resin is 1-50% by weight, preferably 3-30% by weight. Sunahachi 1% by weight
If it is less than 50% by weight, the adsorption ability is small, and if it is 50% by weight or more, film formation, stretching and splitting are difficult.

Film formation, stretching of synthetic resin containing zeolite adsorbent,
Split fibers are made by extruding a synthetic resin film with a film forming device, stretching the film 3 to 10 times, and splitting it with a roll cutter or the like to fibrillate it to obtain an adsorbent material with excellent adsorption ability. obtain.

(Example) An example is shown below.

Example 1 90 parts of polypropylene having an MI value of 1.0 and 10 parts of high-density polyethylene having an MI value of 1.0 were fired at 250 ° C. with a mixture of natural zeolite, ferric hydroxide and calcium hydroxide in a weight ratio of 80: 17: 3. Then, 30% by weight of the pulverized product is mixed, and then kneaded and extruded into pellets at 230 ° C. by an extruder. These pellets were made into a film at 220 ° C with an inflation film forming device, and then slit adjusted to have a width of 50 mm.
After being stretched 10 times at 0 ° C., it was split into fibers through a rotary cutter to obtain a fibrous adsorbent material with a winding of 120,000 denier.

Table 1 shows the results of measuring the adsorption ability of the adsorbent material with respect to ammonia and hydrogen sulfide.

Example 2 A polypropylene having an MI value of 1.0 was mixed with 15 wt% of 325-mesh natural zeolite powder that had been calcined at 250 ° C., and then pelletized, film-formed, drawn and split into fibers in the same manner as in Example 1. The adsorbent material was obtained.

Example 3 Nylon 6 having a relative viscosity of 3.1 and 5% by weight of natural zeolite
After mixing, a film was formed on the film at 270 ° C. by a T-die extruder, stretched 3 times at 200 ° C., and then split by a rotary cutter to obtain a fibrous adsorption material.

Comparative Example 1 Table 2 shows the results of the adsorption capacities measured using the pellets of Example 1 as a comparative example.

Comparative Example 2 The stretched film before splitting in Example 1 was used as a comparative example.

Comparative Example 3 A polypropylene fibrous material which does not use an adsorbent in Example 2 was used as a comparative example.

Reference Example 1 Table 3 shows the results of the adsorption ability measured by using the adsorbent in Example 1 as a reference example.

Reference Example 2 The adsorbent in Example 2 was used as a comparative example.

To measure the adsorption capacity, 600 g of 1 g of sample and ammonia gas adjusted to about 900 ppm or hydrogen sulfide gas adjusted to about 300 ppm was enclosed in a film bag with a good gas barrier property,
Immediately after encapsulation and after 3 hours, the concentration was measured with each gas detector tube.

(Advantages of the Invention) According to the present invention, there is little decrease in adsorption capacity, and since the fibrous form is maintained, there are no problems such as scattering and runoff of adsorbent, convenient handling, and possible development of various applications. Become.

Claims (4)

[Claims] 1. A method for producing an adsorbent material and an adsorbent material, comprising the steps of extruding a synthetic resin containing 1 to 50% by weight of a zeolite adsorbent into a film and then stretching and splitting the resin. 2. The adsorbent material according to claim 1, wherein the zeolite of the zeolite-based adsorbent is a natural zeolite. 3. The adsorbent material according to claim 1, wherein the zeolitic adsorbent comprises natural zeolite, ferric hydroxide and calcium hydroxide. 4. The adsorbent material according to claim 1, wherein the synthetic resin is polypropylene and / or polyethylene polyolefin.