JP-7855387-B2 - Odor-causing substance adsorbent

Inventors

• 岸田 透
• 鳥巣 修一
• 阿部 加奈子
• 塚田 慎一郎
• 大内 祐輝
• 立川 友晴
• 亀井 慎一

Assignees

• 大阪ガスケミカル株式会社

Dates

Publication Date

20260508

Application Date

20220330

Priority Date

20210331

Claims (7)

1. An odor substance adsorbent that adsorbs acetaldehyde , It contains a polycyclic aromatic hydrazine compound , The aforementioned polycyclic aromatic hydrazine compound has the general formula (1): [In the formula, R1a and R2a are the same or different and represent substituents. R3 and R4 are the same or different and represent a divalent hydrocarbon group. m1 and n1 are the same or different and represent an integer from 0 to 4.] A polycyclic aromatic hydrazine compound represented by [formula], which is an odor substance adsorbent.
2. An odor substance adsorbent according to claim 1 , for use in applications where heating is required to 130°C or higher.
3. The odor substance adsorbent according to claim 1 or 2 , wherein the median diameter of the polycyclic aromatic hydrazine compound is 0.1 to 500 μm.
4. A molded article containing an odor substance adsorbent according to any one of claims 1 to 3 .
5. The molded article according to claim 4 , which is heated to 130°C or higher during the manufacturing process, or used after being heated to 130°C or higher.
6. A method for adsorbing odorous substances, comprising the step of bringing an odorous substance containing acetaldehyde into contact with an odorous substance adsorbent according to any one of claims 1 to 3 or a molded article according to claim 4 or 5 .
7. The adsorption method according to claim 6 , wherein the contact step is a step of bringing the odor substance and the odor substance adsorbent into contact at a temperature of 130°C or higher.

Description

This invention relates to an odor substance adsorbent. In recent years, consumer demand for odor elimination has been increasing. In particular, aldehyde compounds with two or more carbon atoms, such as acetaldehyde, are considered causative agents of sick building syndrome. Compared to formaldehyde, they are difficult to adsorb with general-purpose adsorbents (e.g., general-purpose activated carbon), making them especially in high demand for odor elimination. Hydrazine compounds are known adsorbents for such odor-causing substances. Among these, dihydrazide adipic acid, which has relatively high deodorizing performance, is widely used (see, for example, Patent Document 1). However, in applications involving heating processes above 130°C during manufacturing, the deodorizing performance of dihydrazide adipic acid is not fully realized. This is thought to be because the heat history causes some kind of change in dihydrazide adipic acid, reducing its deodorizing performance. In other words, dihydrazide adipic acid has insufficient heat resistance as a deodorizer. For example, in the field of plastic mixing, which is seen in the manufacture of building materials, the molding and drying processes of coatings may involve exposure to environments of around 200°C for about 10 minutes, which reduces the deodorizing performance of dihydrazide adipic acid. As described in Patent Document 2, the present inventors have found that by using hydrazine compounds with high molecular weights, such as dodecane diacide dihydrazide, the adsorption performance of aldehyde compounds can be improved even during high-temperature heating. International Publication No. 2009/122975Japanese Patent Publication No. 2018-187336 The results of odor substance adsorption performance measurements using the odor removal test samples obtained in Example 1 and Comparative Examples 1-3 are shown. For comparison, the results for natural depletion (no additive used) and blank (water used) are also shown.The measurement results of odor substance adsorption performance using the odor elimination test samples obtained in Example 3 and Comparative Examples 4-6 are shown. For comparison, the results for natural depletion (no additives used) and blank (water used) are also shown.The results of odor substance adsorption performance measurements using the odor elimination test samples obtained in Example 4 and Comparative Examples 7-9 are shown. For comparison, the results for natural depletion (no additive used) and blank (water used) are also shown. In this specification, "containing" encompasses the concepts of "including," "consistently essentially of," and "consistently of." Furthermore, in this specification, when a numerical range is indicated as "A to B," it means A or greater and B or less. 1. Odor-causing substance adsorbent The odor-causing substance adsorbent of the present invention is an odor-causing substance adsorbent that adsorbs aldehyde compounds having two or more carbon atoms, and contains a polycyclic aromatic hydrazine compound. (1-1) Polycyclic aromatic hydrazine compounds In the present invention, the hydrazine compound contains a polycyclic aromatic hydrazine compound. This polycyclic aromatic hydrazine compound, while having poor reactivity at room temperature and inferior adsorption performance for aldehyde compounds with two or more carbon atoms, exhibits a dramatic improvement in deodorizing performance and speed when heated to 130°C or higher, unlike conventionally widely used adipic acid dihydrazide. In other words, the odor substance adsorbent of the present invention can be used as a deodorizer suitable for applications requiring heating to 130°C or higher. Furthermore, this polycyclic aromatic hydrazine compound does not decompose even when heated above 130°C, and especially above 180°C, effectively suppressing discoloration. While the polycyclic aromatic hydrazine compound is not particularly limited as long as it has multiple rings (two or more), it is preferable that it has a planar structure in which hydrocarbon rings are condensed together, from the viewpoint of adsorption performance and adsorption rate of aldehyde compounds with two or more carbon atoms at high temperatures of 130°C or higher, and suppression of discoloration. Examples of rings (preferably hydrocarbon rings) that polycyclic aromatic hydrazine compounds may possess include alicyclic hydrocarbon rings such as cyclopropane, cyclobutane, cyclopentane, and cyclohexane rings; and aromatic hydrocarbon rings such as benzene rings. While polycyclic aromatic hydrazine compounds have two or more of these rings, they are aromatic compounds and therefore possess at least one aromatic hydrocarbon ring. The number of rings (preferably hydrocarbon rings) in this polycyclic aromatic hydrazine compound is not particularly limited, but from the viewpoint of adsorption performance and adsorption rate of aldehyde compounds with two or more carbon atoms at high-temperat