JP4518779B2 - Method for deodorizing rubber and method for producing purified air - Google Patents

Description

  The present invention relates to a method for deodorizing rubber, and in particular, the present invention relates to a method for producing purified air with reduced rubber odor.

Rubber odor is generated in the process of masticating natural rubber. The rubber odor pollutes the indoor environment and the outdoor environment through the exhaust duct. In order to eliminate such a rubber odor, various means are known (see, for example, Patent Documents 1 to 4).
Japanese Patent Publication No. 6-78436 Japanese Patent Laid-Open No. 9-76324 JP-A-11-140222 JP-A-8-302069

A deodorant (trade name: Epolion) containing a betaine-related compound as a main component is known (for example, see Non-Patent Document 1). Further, a deodorant (trade name: Calmore Spray) mainly composed of amphoteric ultra high molecular weight polyacrylamide is known (for example, see Non-Patent Document 2).
Ryosan Co., Ltd., “Eporion”, [online], [Search August 12, 2003], Internet <URL: http://www.hissan.co.jp/business/06.html#> Calmore Co., Ltd., “Calmore Spray”, [online], [Search August 12, 2003], Internet <URL: http://www.karumoa.co.jp/splay/index.htm>

The present inventor has found that conventional deodorizing means is insufficient for reducing rubber odor.
The subject of this invention is obtaining the deodorizing method of the rubber | gum which can fully reduce a rubber odor, and obtaining the manufacturing method of the purified air in which the rubber odor was fully reduced.

  The present invention relates to a method for deodorizing rubber, which comprises reacting an odor component of rubber with a betaine-related compound and an amphoteric ultra-high molecular weight polyacrylamide, and uses such a deodorizing method. The present invention relates to a method for producing purified air characterized by reducing rubber odor.

  The present invention also relates to a method for deodorizing rubber, characterized by reacting a rubber odor component with a betaine-related compound and then reacting with a polymer coagulant, and such a deodorizing method. The present invention relates to a method for producing purified air characterized by reducing a rubber odor by using an odor method.

  The present invention is based on the finding that rubber odor is significantly reduced by reacting with betaine related compounds and polymeric coagulants.

  In order to establish an efficient deodorization technique, the present inventor has examined various means such as a deodorant, a deodorization apparatus, and the like, including examination of odor components. As a result, the present inventor can use both betaine-related compounds and amphoteric ultra-high molecular weight polyacrylamide to obtain a synergistic effect that is remarkably superior to the case where each is used alone, and the rubber odor does not cause discomfort. As a result, the present invention was reached.

  Further, the present inventor has found that the rubber odor is remarkably reduced by reacting the odor component of rubber with a betaine-related compound and then reacting with a polymer coagulant, and has reached the present invention.

  According to the present invention, the odor component of rubber can be deodorized by reacting with a betaine-related compound and an amphoteric ultra-high molecular weight polyacrylamide, so that the rubber odor in the air is remarkably reduced to such an extent that it does not cause discomfort.

(1) Rubber odor Odor generated from rubber or when rubber is processed. It consists of odorous components released into the environment, especially into the air. Volatile components generated by the influence of temperature and the like are also included. For example, the odor component of rubber is a lower fatty acid, aldehydes, methyl isobutyl ketone, trimethylamine, alkylbenzenes, derivatives thereof, reaction products with these or other substances, and the like.

(2) Betaine-related compounds These are compounds including betaine compounds and derivatives thereof. The betaine compound is also referred to as trimethylglycine or glycine betaine. Acts as a chemical neutralizer for odor components.

  The deodorization mechanism of betaine-related compounds is chemical neutralization in which an odor component is made odorless by a chemical reaction, so that the deodorizing action is rapid and lasts for a long time. For example, lower fatty acids, aldehydes, ketones and the like are to be deodorized.

  It can be used in the form of a mixture (aqueous solution) with water. In addition, an organic acid compound, a polyamine compound, and the like can be blended. For example, epolione (AL-96 or 633) (trade name, manufactured by Ryozo Co., Ltd.) containing a betaine-related compound as a main component can be used.

  Preferably, the odor component or the air containing it is sufficiently reacted (neutralized) by spraying the betaine related compound. Spraying can be performed by various means without particular limitation.

  Particularly preferably, a two-fluid nozzle including a gas discharge nozzle such as air is used. By spraying betaine-related compounds only by applying pressure (one fluid nozzle), the mist diameter can only be reduced to about 60 μm, but the mist diameter can be reduced to about 10 μm by the gas discharge nozzle. When the mist diameter is changed from φ60 μm to φ10 μm, the contact area with the odor component becomes six times, and more effective gas-liquid contact is possible.

(3) Polymer coagulant Known as a deodorant component. Amphoteric ultra high molecular weight polyacrylamide polymer or amphoteric ultra high molecular weight polyacrylamide copolymer is included. For example, a calmore spray (nose pal EX-11, trade name, manufactured by Calmore Co., Ltd.) whose main component is an amphoteric ultrapolymer polyacrylamide polymer or an amphoteric ultrapolymer polyacrylamide copolymer can be used.

(3-1) Amphoteric ultra high molecular weight polyacrylamide polymer or amphoteric ultra high molecular weight polyacrylamide copolymer It is an amphoteric high molecular compound and functions as a polymer adsorbing coagulant. Typically, it is a linear substance having a molecular weight of about 20 million and a water-soluble polymer compound having an amphoteric charge.

The deodorizing mechanism of amphoteric ultra-high molecular weight polyacrylamide polymer or amphoteric ultra-high molecular weight polyacrylamide copolymer is that this substance exists in a solid state in which the molecular beam is intricately entangled and very entangled with odor components. It is based on the fact that it has an easy structure and has an overwhelmingly large size with respect to the odor component, attracts the odor component by intermolecular attractive force, and remarkably excellent adsorption performance due to its porous structure. After the odor component is adsorbed, amphoteric reactive groups such as an anion group and a cation group cause a chemical reaction in accordance with the odor component and bind to each other, and the odor is not released later.

  In particular, lower fatty acids, aldehydes, ketones, amines, alkylbenzenes (toluene, xylene, etc.) and the like are to be deodorized.

For example, the amphoteric ultra high molecular weight polyacrylamide polymer or the amphoteric ultra high molecular weight polyacrylamide copolymer is composed of (meth) acrylic acid- (meth) acrylamide-dimethylaminomethyl (meth) acrylamide-terpolymer. This is a ternary (co) polymer composed of (meth) acrylic acid, (meth) acrylamide, and dimethylaminomethyl (meth) acrylamide.

  It can be used in the form of a mixture (aqueous solution) with water. In addition, an organic compound such as an alcohol such as ethanol can be blended as a diluent. Alcohol and the like also exhibit antibacterial action. As the propellant (or propellant), an organic compound such as ether such as dimethyl ether can be blended. For example, Calmore spray (described above, trade name) mainly composed of amphoteric ultra high molecular weight polyacrylamide can be used.

  Preferably, the odor component or air containing the same reacts (neutralizes) the betaine-related compound and then reacts (neutralizes) the amphoteric ultra-high molecular weight polyacrylamide. When the amphoteric ultra high molecular weight polyacrylamide is reacted prior to the reaction with the betaine-related compound, the deodorization of the odor component may not be sufficient, and an unpleasant odor may be generated.

  Preferably, the odor component or air containing the odor component is sufficiently reacted (neutralized) by spraying the amphoteric ultra high molecular weight polyacrylamide. Spraying can be performed by various means without particular limitation.

  Particularly preferably, a two-fluid nozzle including a gas discharge nozzle such as air is used. In a one-fluid nozzle that sprays amphoteric ultra-high molecular weight polyacrylamide under pressure, the mist diameter can only be reduced to about φ60 μm, but the mist diameter can be reduced to about 10 μm by the gas discharge nozzle. The most refined structure enables more effective gas-liquid contact.

  Amphoteric ultra-high molecular weight polyacrylamide, when dried, becomes a water-insoluble gel-like substance, but even when it is dry, it continuously absorbs moisture from the environment, and water molecules circulate in the cocoon-shaped component and move inward from the surface. And always take in odor components.

(4) Deodorization reaction The odor component of rubber is deodorized by reacting with a betaine related compound and a polymer coagulant. Both the betaine-related compound and the polymer coagulant inactivate (neutralize) the odor component of rubber through a chemical reaction, thereby reducing the rubber odor. In particular, the polymer coagulant adsorbs the odor component inactivated (neutralized) by the betaine-related compound and causes a chemical reaction, so that a synergistic effect that is remarkably superior to the case of using each alone is obtained. .

  To the extent that rubber odor does not feel uncomfortable by reacting both the odor component of rubber with both betaine-related compounds and polymer coagulants, especially reacting betaine-related compounds and then reacting with polymer coagulants. Reduced to

  The interval between the reaction with the betaine-related compound and the reaction with the polymer coagulant can be a time interval of about 0.5 to 1.0 seconds so that the preceding reaction occurs sufficiently. When processing an odor component at a predetermined flow rate, the betaine-related compound and the polymer coagulant can be sprayed at a predetermined position so that the time interval can be maintained.

  The odor content of rubber can be caused to react with other deodorants in addition to the reaction with betaine-related compounds and with the polymer coagulant. It can be reduced to such an extent that it is not felt.

(5) Method for deodorizing rubber A method for reducing rubber odor generated from rubber and a method for reducing rubber odor generated from rubber are included. In order to reduce the rubber odor generated from the rubber, it is effective to suppress the generation of the rubber odor in the rubber or from the rubber surface.

  Add the betaine-related compound and the polymer coagulant to the rubber simultaneously or separately, or spray or apply the betaine-related compound and the polymer coagulant to the rubber surface simultaneously or separately, etc. , The generation of odor components from the rubber itself is suppressed, and the rubber odor can be significantly reduced.

  Odor components generated from rubber and released into the environment are sufficiently deodorized when both betaine-related compounds and polymer coagulants are reacted simultaneously or separately, to significantly reduce rubber odor in the air. Can do.

(6) Deodorizing apparatus Hereinafter, the deodorizing apparatus for carrying out the deodorizing method of the present invention will be described in more detail with reference to the drawings.
FIG. 1 is a cross-sectional view of a deodorizing apparatus for carrying out an example deodorizing method of the present invention. FIG. 2 is a sectional view of an example of a two-fluid nozzle according to the present invention.

  A deodorizing apparatus 1 as shown in FIG. 1 can be used. The deodorizing apparatus 1 includes a pipe 2 and sprayers 3 and 4. The sprayers 3 and 4 are provided with a siphon tank 5 for storing a deodorant and a detector 6 for detecting the flow rate of the deodorant, and air 7 is supplied by a compressor.

  The gas containing the odor component of rubber flows in the A direction with the inside of the pipe line 2 as a passage. The gas containing the rubber odor component is first sprayed with the betaine-related compound as the first deodorant by the sprayer 3 and sufficiently reacts while flowing in the A direction in the pipe 2. The spraying direction of the deodorant should be the same as the gas flow. Thereafter, the gas after the reaction is sprayed with the polymer coagulant of the second deodorant by the sprayer 4, and the odor is removed by the reaction.

  In the sprayers 3 and 4, a two-fluid nozzle 11 as shown in FIG. 2 is used. The two-fluid nozzle 11 includes a deodorant passage 12 and an air 7 passage 13. The deodorant released from the passage 12 can reduce the mist diameter by the air from the passage 13.

  In the deodorization apparatus as shown in FIG. 1, the odor component reacts with the betaine-related compound released by the sprayer 3 in the upstream, for example, depending on the flow rate of the odor component in the downstream. It is made to react with the polymer coagulant discharged | emitted by the downstream sprayer 4 2-5 m or more away from 3. FIG. Such a deodorizing apparatus can be arrange | positioned in a duct, for example, and can perform a deodorizing reaction in a duct.

  Such a deodorizing apparatus is for implementing the deodorizing method of rubber. In particular, the deodorizing apparatus described above can be used as an apparatus for carrying out a method for producing purified air with reduced rubber odor. When producing purified air, the raw material air contaminated with the rubber odor may be indoor air, exhaust, or outdoor air. Also, the produced purified air can be recirculated indoors or released as exhaust to the outdoors. Since the rubber odor of the purified air is remarkably reduced, discomfort caused by the rubber odor is reduced regardless of whether it is used indoors or released outdoors, and complaints based on such discomfort do not occur.

  As another deodorizing apparatus, a cleaning bottle such as a cleaning bottle for reacting an odor component through a solution of a deodorant can be used. Further, a device that reacts the odor component with both the betaine-related compound and the polymer coagulant simultaneously or separately in the rubber or on the surface of the rubber, such as a kneader or a coating machine, can be used.

Example 1
The present invention will be described in more detail based on examples and comparative examples with reference to the drawings.
FIG. 3 is a graph showing the performance of the deodorizing method of one example of the present invention.
Odor sample containing odor components generated from rubber, betaine compound [trade name: Epolion (AL-96, for carboxylic acid), manufactured by Ryosan Co., Ltd.] and (meth) acrylic acid- (meth) acryloside-dimethyl Aminomethyl (meth) acryloside-ternary polymer [trade name: Calmore Spray (Nosepal EX-11), manufactured by Calmore Inc.] is reacted in this order to deodorize the odor sample.

  The rubber is TSR type 1, which is lab-kneaded.

  The odor sample is prepared as follows. Cut the rubber to a size within 1 cm. This rubber (50 g) is placed in a trap apparatus warmed by an oil bath (150 ° C.). Warm the rubber for 15 minutes. Air is sent into the trap device, and the air around the rubber is taken out and collected in a tedlar bag (50 L). At this time, a flex pump is used so that the air has a constant flow rate. The odor sample is subdivided from the Tedlar bag into odor bags (3 L).

  Dilute Epolion (AL-96) and Calmore Spray (Nose Pal EX-11) at each manufacturer's specified magnification. 3 mL of each is injected into the odor bag in this order using a micropipette or the like. After the injection of each treatment agent, the odor bag is shaken by hand for 30 seconds and left at room temperature for 30 minutes. The experimental conditions are a temperature of 20.2 ° C. and a humidity of 34%.

(Example 2)
In Example 1, the treatment with Epolion (633, for amine) was added between the treatments of Epolion (AL-96) and Calmore Spray (Nosepal EX-11), and the same treatment as in Example 1 was performed.
(Example 3)
In Example 1, during the treatment of Epolion (AL-96) and Calmore Spray (Nose Pal EX-11), a plant extract-based deodorant (Fine 2 trade name, F118A # 10, Fine 2 Co., Ltd., plant) The same treatment as in Example 1 is carried out, with the addition of a deodorant comprising an extract as a main component.

(Examples 4 to 6)
In each of Examples 1 to 3, the rubber is processed in the same manner as in Examples 1 to 3 except that the rubber is changed from the lab mastication TSR type 1 to the lab mastication RSS type.
The experimental conditions are a temperature of 20.8 ° C. and a humidity of 34%.
(Examples 7 to 9)
In each of Examples 1 to 3, the rubber is processed in the same manner as in Examples 1 to 3 except that the rubber kneaded TSR type 1 is changed to the laboratory kneaded TSR type 2.
The experimental conditions are a temperature of 18.7 ° C. and a humidity of 26%.

(Example 10)
A pre-treatment odor sample from lab mastication TSR type 1 similar to Example 1 is treated by bubbling in a deodorant solution.
Dilute Epolion (633) at the manufacturer's specified magnification. Place 100 mL of diluted deodorant solution in the cleaning bottle. Set the flex pump in the cleaning bottle. Set the tedlar bag containing the odor sample (50 L) in the cleaning bottle. By bubbling the odor sample in the deodorant solution, the air in the cleaning bottle is replaced with the treated odor sample. Set a sampling odor bag in the cleaning bottle. The treated odor sample is sampled in the odor bag using a flex pump. For the treated odor sample, this operation is repeated in the order of Epolion (AL-96) and Calmore Spray (Nose Pal EX-11) as shown in combination A of Table 1. The experimental conditions are a temperature of 19.8 ° C. and a humidity of 33%.

(Example 11)
In Example 10, the same treatment as in Example 10 is performed except that the rubber is changed from the lab mastication TSR type 1 to the lab mastication RSS type. The experimental conditions are a temperature of 20.9 ° C. and a humidity of 31%.
(Example 12)
In Example 10, the same process as in Example 10 is performed except that the rubber is changed from the lab kneaded TSR type 1 to the lab kneaded TSR type 2. The experimental conditions are a temperature of 20.3 ° C. and a humidity of 40%.

(Comparative Example 1)
In Example 1, as a deodorant, a surfactant-based deodorant / masking agent (odorless source, trade name, 4D-03-NS, manufactured by Odorless Source Co., Ltd., plant extract / surfactant / fragrance as a main component. The odor sample is treated in the same manner as in Example 1 except that only the deodorant is reacted.
(Comparative Example 2)
In Example 1, treatment is performed by injecting water (distilled water) into the odor bag without using any deodorant.
(Comparative Example 3)
In Example 1, an odor sample is treated in the same manner as in Example 1 except that only Calmore Spray is reacted as a deodorant.
(Comparative Example 4)
In Example 1, an odor sample is treated in the same manner as in Example 1 except that only Fine 2 is reacted as a deodorant.
(Comparative Example 5)
In Example 1, an odor sample is treated in the same manner as in Example 1 except that only epolione (AL-96) is reacted as a deodorant.
(Comparative Example 6)
In Comparative Example 5, the odor sample is treated in the same manner as Comparative Example 5 except that Fine 2 is reacted after epolione (AL-96) is reacted.
(Comparative Example 7)
In Comparative Example 4, the odor sample is treated in the same manner as in Comparative Example 4 except that the fine 2 is reacted and then the calmore spray is reacted.
(Comparative Example 8)
In Comparative Example 5, the odor sample is treated in the same manner as in Comparative Example 5, except that Epolion (633) is reacted after Epolion (AL-96) is reacted.
(Comparative Example 9)
In the comparative example 5, it processes like the comparative example 5 except using an epolione (633) instead of an epolione (AL-96). The experimental conditions are a temperature of 19.4 ° C. and a humidity of 33.4%.
(Comparative Example 10)
In Comparative Example 1, the same process as in Comparative Example 1 is performed except that the dilution ratio of the odorless source is changed from 200 times to 50 times. The experimental conditions are a temperature of 19.4 ° C. and a humidity of 33.4%.

(Comparative Examples 11-20)
In each of Comparative Examples 1 to 10, the same process as in Comparative Examples 1 to 10 is performed except that the rubber is changed from the lab kneaded TSR type 1 to the lab kneaded RSS type. The experimental conditions are the same as in Example 4 except that Comparative Examples 19 and 20 have a temperature of 18.6 ° C. and a humidity of 33%.
(Comparative Examples 21-28)
In each of Comparative Examples 1 to 8, the rubber is processed in the same manner as Comparative Examples 1 to 8 except that the rubber is changed from the lab kneaded TSR type 1 to the lab kneaded TSR type 2. The experimental conditions are the same as in Example 7.

(Comparative Example 29)
In Example 10, as shown in the combination B of Table 1, the process is performed in the same manner as in Example 10 except that the process by the calmore spray is not performed.
(Comparative Example 30)
In Example 10, as shown in the combination C of Table 1, it is the same as Example 10 except that the treatment of fine 2 is performed after the treatment of eporion (AL-96) without treatment of eporion (633) and calmore spray. To process.
(Comparative Example 31)
In Example 10, as shown in the combination D of Table 1, the treatment with eparion and calmore spray is not performed, but the treatment with alkali (0.5N NaOH) and acid (0.5N sulfuric acid) is performed in this order. Are processed in the same manner as in Example 10.

(Comparative Examples 32-34)
In each of Comparative Examples 29 to 31, the rubber is processed in the same manner as Comparative Examples 29 to 31 except that the rubber is changed from the lab-kneaded TSR type 1 to the lab-kneaded RSS type. The experimental conditions are the same as in Example 11.
(Comparative Examples 35-38)
In each of Comparative Examples 29 to 31, the rubber is treated in the same manner as Comparative Examples 29 to 31 except that the rubber mastication TSR type 1 is changed to the lab mastication TSR type 2 (Comparative Examples 35 to 37). In addition, the comparative example 38 shows the process of only an odorless origin. The experimental conditions are the same as in Example 12.

(Comparative Example 39)
In Comparative Example 6, the same process as in Comparative Example 6 is performed except that Epolion (AL-96) and Fine 2 are injected and mixed in the odor bag almost simultaneously.
(Comparative Example 40)
In Comparative Example 8, treatment is performed in the same manner as Comparative Example 8 except that Eparion (AL-96) and Epolion (633) are injected and mixed in the odor bag almost simultaneously.
(Comparative Example 41)
In Comparative Example 16, the same process as in Comparative Example 16 is performed except that Epolion (AL-96) and Fine 2 are injected and mixed in the odor bag almost simultaneously.

(Evaluation)
Each process in Examples 1-12 and Comparative Examples 1-41 is evaluated by the degree of the odor of the post-process odor. The evaluation is performed by analyzing the odor sample after treatment with an odometer and measuring the degree of discomfort. The degree of discomfort is expressed by a standard as shown in Table 2 below. The discomfort degree of the original odor (rubber odor) is set to “5”, and the discomfort degree of the processed odor is compared with the nose. The discomfort level is determined in units of 0.5, and the target value is 1.5 or less. The results are shown in Tables 3-7. FIG. 3 shows a graph of a part of the results in Table 3.

  As shown in Tables 3 to 10 and FIG. 3, the betaine compounds of Examples 1 to 12 and (meth) acrylic acid- (meth) acryloside-dimethylaminomethyl (meth) acrylic compared to the treatments of Comparative Examples 1-41 The treatment of the combination of the acid and the ternary polymer has a low odometer strength and a discomfort degree of about 0.5, sufficiently satisfies the target value of the discomfort degree of 1.5 or less, and can significantly reduce the rubber odor.

  In addition, as shown in the results of Comparative Examples 39 to 41, when using Epolion (AL-96) simply in combination with Fine 2 or the like, an unpleasant odor that may make you feel uncomfortable (something, Other odorous substances may be generated.), Stable due to combination of betaine compound and (meth) acrylic acid- (meth) acryloside-dimethylaminomethyl (meth) acryloside-terpolymer The deodorant treatment cannot be expected.

  The rubber deodorization method of the present invention can be used using a betaine-related compound and an amphoteric ultra high molecular weight polyacrylamide, and is extremely useful for obtaining purified air with a reduced rubber odor.

It is sectional drawing of the deodorizing apparatus which enforces the deodorizing method of one example of this invention. It is sectional drawing of the 2 fluid nozzle of an example concerning this invention. It is a graph which shows the performance of the deodorizing method of one example of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Deodorizing device 2 Pipe line 3, 4 Sprayer 5 Siphon tank 6 Detector 7 Air 11 2 Fluid nozzle 12, 13 Passage

Claims (2)

In producing purified air with reduced rubber odor, after reacting air containing the odor component of rubber with betaine-related compounds upstream, it is amphoteric charge with a linear substance 2-5 m or more downstream. A process for producing purified air, characterized by reacting with an amphoteric ultrapolymer polyacrylamide polymer or an amphoteric ultrapolymer polyacrylamide copolymer, which is a water-soluble polymer having water.   The method for producing purified air according to claim 1, wherein the reaction is performed in a duct.

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