TWI490232B - Formaldehyde scavenger and method for preparing the same - Google Patents

Description

Formaldehyde trapping agent and preparation method thereof

The disclosure relates to a formaldehyde trapping agent and a preparation method thereof, in particular to a formaldehyde trapping agent with high formaldehyde absorption rate and fast absorption speed and a preparation method thereof.

Formaldehyde has been recognized by the World Health Organization as a carcinogenic and teratogenic substance. However, since formaldehyde-based adhesives are inexpensive and easy to manufacture, they are still widely used in various construction, decoration and decorative materials, such as in artificial panels, plastic flooring, chemical fiber materials, coatings, adhesives, and foaming. Glue, insulation, adhesive, fiber, carpet, floor slab, etc. The free formaldehyde from these materials has become a common source of indoor air pollution, which is very harmful to human health. In addition to the high concentration, it will cause extreme discomfort to the eyes and respiratory tract. Formaldehyde can also cause many diseases, such as respiratory diseases and women's menstrual irregularities. Neonatal malformations, acute depression, and even cancers of the respiratory tract, skin, and digestive tract. Therefore, how to effectively reduce the formaldehyde content in the air is a very important issue.

The present disclosure relates to a formaldehyde trapping agent and a method for preparing the same, which have high formaldehyde absorption rate and fast absorption speed.

According to the disclosure, a formaldehyde trapping agent is proposed, which comprises cyclodextrins in a proportion of 5-40 wt%, and the content ratio is 5-50 wt%. The amine compound and water in a proportion of 25 to 90% by weight.

According to the disclosure, a method for preparing a formaldehyde trapping agent comprises: providing a cyclodextrin, an amine compound and water; uniformly mixing a cyclodextrin and an amine compound in water to form an aqueous solution of a formaldehyde trapping agent, wherein the content of the cyclodextrin The ratio is 5-40 wt%, the content ratio of the amine compound is 5-50 wt%, and the water content ratio is 25-90 wt%.

In order to make the above content of the disclosure more obvious, the following detailed description is given as follows:

The following examples provide a formaldehyde trapping agent and a preparation method thereof for rapidly capturing and reacting with formaldehyde molecules or ammonia molecules, so that formaldehyde molecules or ammonia molecules are not easily dispersed in the space, thereby reducing pollution.

In one embodiment, the formaldehyde scavenger comprises cyclodextrins in a proportion of 5-40 wt%, amino compounds in a proportion of 5-50 wt%, and a ratio of 25-90 wt. % water. Cyclodextrin can adsorb formaldehyde molecules or ammonia molecules in air or in aqueous solution, actively capture the formaldehyde molecules in the environment, and amine compounds can quickly react with formaldehyde molecules or ammonia molecules.

The cyclodextrin refers to a cyclic oligosaccharide formed of six or more glucopyranoside molecules, for example, α-cyclodextrin represented by the following chemical formula [I].

However, the practical application is not limited to the cyclodextrin structure as described in the chemical formula [I], and in other embodiments, the β-cyclodextrin and the γ- represented by the following chemical formulas [II] and [III] may also be used. Cyclodextrin.

In addition, the functional group on the surface of the cyclodextrin can be appropriately modified. For example, by adding a molecular group having a deodorizing function, deodorization can be performed while capturing formaldehyde molecules or ammonia molecules.

As can be seen from the above structural formula, the molecular structure of the cyclodextrin has a plurality of hydroxyl polar groups and has a hydrogen bonding force with the formaldehyde molecule or the ammonia molecule. And the molecular structure of the cyclodextrin is a ring-shaped hollow structure, and the central pore can actively adsorb formaldehyde molecules or ammonia molecules in a nearby environment (such as air or an aqueous solution) like a molecular capsule. However, due to the solubility of cyclodextrin in water Not high (about 1%), the effect of formaldehyde adsorption by cyclodextrin alone is rather limited. In the examples, the amine molecule or the ammonia molecule is rapidly reacted by using an amine compound, so that the formaldehyde molecule or the ammonia molecule cannot escape into the environment.

In one embodiment, the amine compound is, for example, a urea or ammonium salt compound, the amine group (-NH ₂ ) being capable of chemically adsorbing with the formaldehyde molecule to produce a chemical reaction such as H ₂ CO (formaldehyde) + R-NH ₂ (amino compound) → H ₂ C=N-R+H ₂ O

The adsorption of the amine group and formaldehyde is not limited thereto. In addition, the combination of the amine compound and the cyclodextrin can greatly increase the solubility of the cyclodextrin in water (>10%) and significantly increase the formaldehyde absorption rate.

The pH range of the formaldehyde scavenger of the present embodiment will vary depending on the kind of the amine compound and the content ratio. Preferably, but not limited to, the pH can be between 4 and 11. In one embodiment, an additional acidic compound such as hydrochloric acid, acetic acid, phosphoric acid, sulfuric acid, polyacrylic acid or citric acid may be added to adjust the pH range between 4-6 to increase the cyclodextrin and the amine compound. Solubility, increasing the rate of formaldehyde absorption.

<sample preparation>

Table 1 lists the component content ratios of the plurality of samples of the formaldehyde trapping agent of the present embodiment, wherein the samples 1 and 2 are respectively a control group containing only cyclodextrin and urea.

The method for preparing the sample of No. 1-7 formaldehyde scavenger described above is prepared by preparing a cyclodextrin, an amine compound, and water in a content ratio of Table 1, and then uniformly mixing the cyclodextrin and the amine compound in water.

<Formaldehyde absorption rate test>

Here, the formaldehyde absorption rate test was carried out in a control group 1 (containing only cyclodextrin), a control group 2 (containing only urea), and a formaldehyde trapping agent of the examples. Take the formaldehyde trapping agent sample shown in Table 1 according to the proportion of adding appropriate formaldehyde (such as high concentration and low concentration of formaldehyde), derivatization and coloring according to ISO 14184-1:2011 specification by UV-visible spectrophotometric agent The residual amount of free formaldehyde in the solution was measured to calculate the formaldehyde absorption rate. Table 2 shows the results of the formaldehyde absorption rate test of the formaldehyde trap samples of Nos. 1-7 in Table 1.

From the formaldehyde absorption rate test results in Table 2, it can be seen that the control group 1 containing only cyclodextrin can absorb formaldehyde, but the absorption rate is not high (only 5%), and when the formaldehyde concentration is increased (3000 ppm), absorption The rate has plummeted (<1%).

In addition, the change in the absorption rate of the control group 2 containing only urea at a different formaldehyde concentration was stable, but the effect was not good, and the absorption rate was only about 10%.

The formaldehyde trapping agent of this embodiment mixes cyclodextrin with an amine compound, and the absorption rate is significantly increased at a formaldehyde concentration of 200 ppm, up to 99.6% (sample 3), and at a high formaldehyde concentration of 3000 ppm, absorption. The rate remained roughly stable and even better (sample 4 increased from 16.6% to 24.8%, and sample 7 increased from 51.8% to 69.6%). Therefore, unlike the control group of the single component, the formaldehyde trapping agent of the present embodiment mixes the cyclodextrin with the amine compound, and the absorption rate (16.6%-99%) obtained is a simple addition (15%) of the two. It can be up to 6 times or more, and even has a better absorption rate when the formaldehyde concentration is increased.

In addition, as described above, an appropriate amount of an acidic compound may be added to adjust the pH of the formaldehyde scavenger. The type of the acidic compound is not particularly limited and may be hydrochloric acid, acetic acid, phosphoric acid, sulfuric acid, polyacrylic acid or citric acid, as long as it does not It can be reacted with a formaldehyde trapping agent. Table 3 is the results of the absorbance test of the formaldehyde trapping agent of one example at different pH values.

It can be seen from the test results in Table 3 that the pH value affects the absorption rate of the formaldehyde trapping agent. For the same sample, the absorption rate of formaldehyde is higher when the pH is lower (about 5), that is, when the solution is acidic; and when the pH is high (about 9), the solution is alkaline. The absorption rate is relatively low. Therefore, the formaldehyde absorption rate can be further improved by adjusting the pH of the formaldehyde trapping agent.

Although the present disclosure has been described above with reference to the preferred embodiments, it is not intended to limit the disclosure. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the disclosure. Therefore, the scope of protection of this disclosure is subject to the definition of the scope of the appended claims.

Claims (11)

A formaldehyde trapping agent comprising a cyclodextrin in an amount of from 5 to 10% by weight, a monoamine compound in an amount of from 40 to 50% by weight, and water in an amount of from 45 to 50% by weight. The formaldehyde scavenger according to claim 1, wherein the amine compound is urea. The formaldehyde scavenger according to item 2 of the patent application includes a cyclodextrin having a content ratio of 10% by weight, urea in a content ratio of 40% by weight, and water in an amount of 50% by weight. A formaldehyde scavenger according to claim 1 which has a pH between 4 and 11. The formaldehyde scavenger according to claim 4 of the patent application further comprises an acidic compound such that the pH is between 4 and 6. The formaldehyde scavenger according to claim 5, wherein the acidic compound is selected from the group consisting of polyacrylic acid, citric acid, hydrochloric acid, sulfuric acid, acetic acid, and phosphoric acid. A method for producing a formaldehyde scavenger, comprising: providing a cyclodextrin, an amine compound and water; uniformly mixing the cyclodextrin and an amine compound in water to form an aqueous solution of a formaldehyde scavenger, wherein the content of the cyclodextrin The ratio is 5-10% by weight, the content ratio of the amine compound is 40-50% by weight, and the content ratio of water is 45-50% by weight. The method for producing a formaldehyde scavenger according to claim 7, wherein the amine compound is urea. The manufacturer of the formaldehyde trapping agent as described in claim 8 The method wherein the cyclodextrin content ratio is 10% by weight, the urea content ratio is 40% by weight, and the water content ratio is 50% by weight. The method for producing a formaldehyde scavenger according to claim 7, further comprising: adding an acidic compound to adjust a pH of the formaldehyde scavenger so that the pH is between 4 and 6. The method for producing a formaldehyde scavenger according to claim 10, wherein the acidic compound is selected from the group consisting of polyacrylic acid, citric acid, hydrochloric acid, sulfuric acid, acetic acid, and phosphoric acid.