Preparation method of degradable green and environmentally friendly deodorant

Abstract

The present invention discloses a method for preparing a biodegradable, green and environmentally friendly deodorant. The deodorant is a copolymer containing polyitaconic acid and contains multiple electronegative functional groups such as sulfonic acid groups and carboxyl groups, which can significantly adsorb dust or small-sized particles in the environment. In addition, the functional groups generate repulsive forces with each other, which promotes the stretching of the copolymer structure, thereby improving the uniformity of surface film formation and enhancing the deodorizing effect. The deodorant itself has strong adhesion and water retention, and does not require the addition of additional binders and moisturizers, thus having broad application prospects.

Description

Technical Field

[0001] The invention belongs to the technical field of deodorants, and particularly relates to a preparation method of a degradable green and environmentally friendly deodorant. Background Art

[0002] Odor pollution has a negative impact on the human living environment and human health. It has certain harms on the respiratory, digestive, circulatory, endocrine, and nervous systems. Long-term exposure to low-concentration odors can cause breathing difficulties, nausea, dizziness, vomiting, and severe psychological discomfort.

[0003] Researchers have developed a new type of deodorizing agent based on itaconic acid and its derivatives, supplemented with a small amount of natural substances. It reacts with odor-causing substances such as alcohols, amines, malodorous mercaptans, odorous ammonia, and odorous halogens to produce an odorless compound, thereby eliminating odors. However, itaconic acid and its simple derivatives suffer from low deodorizing efficiency. Based on this, Chinese patent document CN116370681A employs polyitaconic acid, a surfactant, a humectant, and an adhesive, which are then mixed with water and sprayed onto the surface of the object to be treated to form a protective film. However, this process requires the use of multiple functional agents such as surfactants, humectants, and adhesives.

[0004] It is necessary to propose a biodegradable green and environmentally friendly deodorant that can improve the deodorizing effect without complex compounding. Summary of the Invention

[0005] In view of this, the object of the present invention is to provide a degradable green and environmentally friendly deodorant that does not require a complicated compounding process and improves the deodorizing effect.

[0006] To solve the above problems, the present invention provides the following solutions:

[0007] The first aspect of the present invention is to provide a biodegradable green and environmentally friendly deodorant having the structural formula shown in Formula I:

[0008] .

[0009] The second aspect of the present invention is a method for preparing the biodegradable green deodorant of the first aspect, which is obtained by reacting poly(vinyl alcohol-vinyl acetate-itaconic acid) with vinyl sulfonic acid via Wilkinson catalytic hydrogenation. The poly(vinyl alcohol-vinyl acetate-itaconic acid) has the structural formula shown in Formula II:

[0010] .

[0011] The CAS number of the poly(vinyl alcohol-vinyl acetate-itaconic acid) is 94479-84-2.

[0012] Furthermore, the mass ratio of the poly(vinyl alcohol-vinyl acetate-itaconic acid) to vinyl sulfonic acid is 1:(0.001-0.05).

[0013] Furthermore, the catalyst in the preparation process is tris(triphenylphosphine)rhodium chloride; and / or the solvent used in the reaction process is chloroform.

[0014] The third aspect of the present invention is to provide a deodorization method, comprising atomizing and spraying the degradable green and environmentally friendly deodorant aqueous solution described in the first aspect onto the surface of the construction site to form a protective film layer on the surface of the object to be constructed.

[0015] Furthermore, water-soluble plant extracts are added to the aqueous solution, and the amount of the water-soluble extracts accounts for 0.1-1 wt % of the mass of the aqueous solution.

[0016] Furthermore, the water-soluble plant extract is selected from at least one of green tea water extract, mugwort water extract, and licorice water extract.

[0017] Furthermore, a pH adjuster is added to the aqueous solution. Preferably, the alkaline buffer is selected from an organic or inorganic base, and the inorganic base can be selected from common sodium hydroxide or an organic base such as an alkali metal salt of an alcohol. The amount of sodium hydroxide used is 1.5-2% of the mass of the deodorant.

[0018] Furthermore, the concentration of the deodorant solution is 1-10 wt%.

[0019] The fourth aspect of the present invention is to propose the application of the degradable green and environmentally friendly deodorant described in the first aspect in deodorization, for example, as a deodorant or dust suppressant for use in the field of environmental protection and construction, which has excellent deodorization and dust suppression effects.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] The deodorant proposed in the present invention is a copolymer containing polyitaconic acid, and contains many electronegative functional groups such as sulfonic acid groups and carboxyl groups, which can significantly adsorb dust or small-sized particles in the environment; in addition, the above-mentioned functional groups generate repulsion with each other, which promotes the stretching of the copolymer structure, which is beneficial to improving the surface film formation uniformity and adhesion, and enhancing the deodorization effect.

[0022] The deodorant proposed by the present invention has good water solubility, and the deodorant itself has strong adhesion and water retention properties, and does not require the addition of additional binders or moisturizers. It is simple to use when applied to deodorization and has strong applicability.

[0023] The deodorant preparation method proposed in this invention is simple and easy to implement. Through a Wilkinson catalytic reaction, vinyl alcohol units undergo hydrogenation with vinyl sulfonic acid due to steric hindrance, forcing the sulfonic acid groups away from the carboxyl groups of the polyitaconic acid units, ensuring excellent stretch and deodorizing properties. Furthermore, the deodorant structure comprises a block copolymer composed of common polyvinyl alcohol, polyvinyl acetate, and polyitaconic acid, all of which are biodegradable units. This environmentally friendly and promising product has broad application prospects. DETAILED DESCRIPTION

[0024] The following examples are provided to illustrate the present invention but are not intended to limit the scope of the present invention. Without departing from the spirit and substance of the present invention, modifications or substitutions made to the methods, steps or conditions of the present invention are within the scope of the present invention.

[0025] The reagents used in the following examples are commonly used reagents in the field and are commercially available standards unless otherwise specified. Unless otherwise specified, the experimental methods used are methods known in the art. The poly(vinyl alcohol-vinyl acetate-itaconic acid) used was purchased from Taizhou Zhongzhi Biological Co., Ltd. The water extract used was a powder obtained by ultrasonic extraction of plants with water and concentration and drying, purchased from Shandong Yousuo Co., Ltd.

[0026] Preparation Example Preparation of deodorant

[0027] 1) Dissolve 100 g of vinyl sulfonic acid and 10 g of tris(triphenylphosphine)rhodium chloride in chloroform to obtain solution 1;

[0028] 2) Take 3 kg of poly(vinyl alcohol-vinyl acetate-itaconic acid) and dissolve it in chloroform to obtain solution 2;

[0029] 3) Add solution 2 dropwise to solution 1 and continue the reaction at 35-45°C for 15-20 hours;

[0030] 4) extracting and separating the organic phase, and removing the chloroform by rotary evaporation to obtain a deodorant having the structure of Formula I.

[0031] The obtained deodorant was analyzed by Fourier transform infrared spectroscopy. -1 A strong S=O stretching vibration absorption peak is observed near the sulfonic acid group, indicating the presence of sulfonic acid groups; at 3387 cm -1 The strong absorption broad peak at 2975 cm -1 The absorption peak at 1681 cm indicates the presence of OH stretching vibration, indicating the presence of carboxyl groups in the deodorant. -1 The absorption peak indicates the stretching vibration of the carbon-carbon double bond containing trans substituents. Example

[0032] A deodorant solution comprises the following components by weight: 100 parts of a deodorant having a structure of Formula I, 896 parts of water, 2 parts of sodium hydroxide, and 2 parts of a liquorice aqueous extract. Example

[0033] A deodorant solution comprises the following formula by mass: 80 parts of a deodorant having a structure of formula I, 913.5 parts of water, 1.5 parts of sodium hydroxide, and 5 parts of a liquorice aqueous extract. Example

[0034] A deodorant solution comprises the following formula by mass: 50 parts of a deodorant having a structure of formula I, 941 parts of water, 1 part of sodium hydroxide, and 8 parts of an aqueous extract of wormwood. Example

[0035] A deodorant solution comprises the following formula by mass: 25 parts of a deodorant having a structure of formula I, 964.5 parts of water, 0.5 parts of sodium hydroxide, and 10 parts of a green tea water extract.

[0036] Comparative Example 1

[0037] A deodorant solution comprises the following formula by mass: 25 parts of a compound having a structure of formula II, 964.5 parts of water, 0.5 parts of sodium hydroxide, and 10 parts of a green tea water extract.

[0038] Experimental example

[0039] 1. Film forming performance evaluation

[0040] The deodorant solution prepared in Example 1 was injected into a flat and clean plate trough with a dropper and then spread evenly with an applicator. After 60 minutes at 45°C, the changes in the plate trough surface were observed. It was found that a uniform film was clearly formed in the plate trough, and the film did not crack after another 60 minutes. This shows that the deodorant solution prepared from poly(vinyl alcohol-vinyl acetate-itaconic acid) modified with vinyl sulfonic acid has excellent film-forming properties.

[0041] The prepared deodorant solution was spread evenly on a glass dish and dried under natural conditions (25°C). After forming a film, its film-forming properties were analyzed. The mass M of the film of different samples under natural conditions was recorded. The prepared film was placed in a wind speed meter with a wind speed of 15.2 m / s. After 10 minutes, the mass m of the film was recorded and the wind erosion rate was calculated (wind erosion rate = (Mm) / M). The results are shown in Table 1:

[0042] Table 1: Film formation time and wind erosion rate

[0043] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Wind erosion rate% 0.013 0.015 0.016 0.016 0.104

[0044] It is not difficult to see from Table 1 that the wind erosion rates of the deodorants obtained by configuring Examples 1 to 4 are very small, while the wind erosion rate of Comparative Example 1 is significantly increased. The possible reason is that the sulfonic acid groups contained in the homemade deodorant copolymer and other electronegative groups are discharged, which is conducive to the stretching of the structure, thereby improving the uniformity of film formation; in addition, the sulfonic acid groups can improve the adhesion and covering power of the substrate surface, reduce the wind erosion rate, and increase the service life of the film, thereby improving the deodorization effect.

[0045] 2. Deodorization performance evaluation

[0046] At a landfill, a composite intelligent detector detected the presence of the following gas components: 113 ppm ammonia, 25 ppm hydrogen sulfide, and 27 ppm methyl mercaptan. At 25°C and on a sunny day, the same amount of deodorant solution was sprayed in different areas of the landfill. After four hours, the composite intelligent detector was used again to test the deodorizing effects of the deodorant solutions in the examples and comparative examples. The results are shown in Table 2.

[0047] Table 2:

[0048] Gas content ppm Ammonia hydrogen sulfide Methyl mercaptan Example 1 53 9 10 Example 2 52 8 9 Example 3 53 10 12 Example 4 57 12 13 Comparative Example 1 85 20 21

[0049] As shown in Table 2, the deodorant solution prepared by the present invention exhibits excellent deodorizing performance. Comparative Example 1 differs from Example 4 in that it utilizes a compound with the structure of Formula II without modification with vinyl sulfonic acid, resulting in decreased deodorizing performance. This is likely due to the lack of repulsion between the sulfonic acid and carboxyl groups, which affects the stretchability of the copolymer structure and leads to decreased film-forming performance. The deodorant prepared in this example exhibits good water solubility and inherent film-forming properties, eliminating the need for the addition of surfactants or film-forming substances. Furthermore, the copolymer structure contains a large number of hydroxyl groups, eliminating the need for a humectant. This makes it easy to use and highly adaptable for deodorizing applications.

[0050] The present invention is not limited to what is described in the specification and implementation modes, and therefore, additional advantages and improvements can be easily realized by those skilled in the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details, representative schemes and described embodiments.

Claims

1. A degradable green and environmentally friendly deodorant, characterized in that: It has the structural formula shown in Formula I: 。 2. The method for preparing the degradable green deodorant according to claim 1, characterized in that: The degradable green and environmentally friendly deodorant represented by formula I is obtained by Wilkinson catalytic hydrogenation reaction of poly(vinyl alcohol-vinyl acetate-itaconic acid) and vinyl sulfonic acid.

3. The preparation method according to claim 2, characterized in that The mass ratio of the poly(vinyl alcohol-vinyl acetate-itaconic acid) to vinyl sulfonic acid is 1:(0.001-0.05).

4. The preparation method according to claim 2, characterized in that The catalyst in the preparation process is tris(triphenylphosphine)rhodium chloride; and / or the solvent used in the reaction process is chloroform.

5. A deodorization method, characterized in that the steps include: The aqueous solution containing the deodorant is atomized and sprayed onto the surface of the construction site to form a protective film layer on the surface of the object to be constructed; the deodorant is the degradable green and environmentally friendly deodorant according to claim 1.

6. The deodorization method according to claim 5, characterized in that A water-soluble plant extract is further added to the aqueous solution, and the amount of the water-soluble plant extract accounts for 0.1-1 wt % of the mass of the aqueous solution.

7. The deodorization method according to claim 6, characterized in that The water-soluble plant extract is selected from at least one of green tea water extract, mugwort water extract and liquorice water extract.

8. The deodorization method according to claim 5, characterized in that A pH regulator is also added to the aqueous solution.

9. The deodorization method according to claim 5, characterized in that The concentration of the deodorant in the aqueous solution is 1-10 wt %.

10. Use of the degradable green and environmentally friendly deodorant according to claim 1 in deodorization.

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