Preparation method of degradable green environment-friendly deodorant

Abstract

The invention discloses a preparation method of a degradable green environment-friendly deodorant, the deodorant is a copolymer containing polyitaconic acid, contains a plurality of electronegative functional groups such as sulfonic acid groups and carboxyl groups, and can significantly adsorb dust or small-particle-size particles in the environment; in addition, the functional groups generate repulsive force to promote the copolymer structure to stretch, so that the surface film forming uniformity is improved, and the deodorization effect is improved; and the deodorant has relatively strong adhesiveness and water-retaining property, does not need additional addition of a binder and a humectant, and has a wide application prospect.

Description

Technical Field

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

[0002] Odor pollution has adverse effects on the living environment and human health. It has certain harm to the respiratory, digestive, circulatory, endocrine and nervous systems of the human body. Long-term exposure to low-concentration odor will cause breathing difficulties, nausea, dizziness and vomiting, and produce strong psychological discomfort.

[0003] Japanese researchers have developed a new type of deodorant, which is made of itaconic acid and its derivatives as the main ingredients, and a small amount of natural substances as raw materials. It can react with odor-producing alcohols, amines, malodorous mercaptans, odorous ammonia and odorous halogens to generate an odorless compound, thereby eliminating the odor. However, itaconic acid and its simple derivatives have the defect of low deodorization efficiency. On this basis, Chinese patent document CN116370681A adopts polyitaconic acid, surfactants, moisturizers, adhesives, and water to stir evenly, and then sprays it on the surface of the object to be constructed to form a protective film layer. However, this process requires the use of multiple functional reagents such as surfactants, moisturizers, 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 scheme of the present invention is as follows:

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

[0008]

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

[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, a water-soluble plant extract is added to the aqueous solution, and the amount of the water-soluble extract 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, wormwood water extract and licorice water extract.

[0017] Furthermore, a pH regulator is added to the aqueous solution; preferably, the alkaline buffer is selected from organic or inorganic bases, and the inorganic base can be selected from common sodium hydroxide, organic alkali metal salts such as alcohols, etc. 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 to 10 wt %.

[0019] The fourth aspect of the present invention is to propose the application of the degradable green 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 group and carboxyl group, which can significantly adsorb dust or small-size particles in the environment; in addition, the above-mentioned functional groups generate repulsion with each other to promote the stretching of the copolymer structure, which is beneficial to improve the surface film formation uniformity and adhesion, and enhance the deodorization effect.

[0022] The deodorant provided by the present invention has good water solubility, and the deodorant itself has strong adhesion and water retention performance, and does not need to add additional binders or moisturizers. It is easy to use and has strong applicability when applied to deodorization.

[0023] The deodorant preparation method proposed by the present invention is simple and easy. Through the Wilkinson catalytic reaction, due to the steric hindrance, the vinyl alcohol unit and the vinyl sulfonic acid undergo a hydrogenation reaction, forcing the sulfonic acid group to stay away from the carboxyl group of the polyitaconic acid unit, thereby ensuring excellent stretching performance and deodorizing performance. The block copolymer contained in the deodorant structure is common polyvinyl alcohol, polyvinyl acetate and polyitaconic acid, all of which are degradable units, are green and environmentally friendly, and have broad application prospects. DETAILED DESCRIPTION

[0024] The following examples are used to illustrate the present invention, but do not limit the scope of the present invention. Without departing from the spirit and essence 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 art, and are commercially available standard products 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 Company. The water extract used was a powder obtained by ultrasonic extraction of plants with water and concentrated drying, purchased from Shandong Yousuo Company.

[0026] Preparation Example Preparation of deodorant

[0027] 1) 100 g of vinyl sulfonic acid and 10 g of tris(triphenylphosphine)rhodium chloride were dissolved 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 a 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; -1 The strong absorption broad peak indicates the presence of OH stretching vibration; 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.

[0032] Example 1

[0033] 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 liquorice water extract.

[0034] Example 2

[0035] A deodorant solution comprises the following components by weight: 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 liquorice water extract.

[0036] Example 3

[0037] A deodorant solution comprises the following components by weight: 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.

[0038] Example 4

[0039] A deodorant solution comprises the following formula by weight: 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.

[0040] Comparative Example 1

[0041] A deodorant solution comprises the following formula by weight: 25 parts of a compound of formula II, 964.5 parts of water, 0.5 parts of sodium hydroxide and 10 parts of green tea water extract.

[0042] Experimental example

[0043] 1. Film forming performance evaluation

[0044] The deodorant solution prepared in Example 1 was injected into a flat and clean plate groove with a dropper, and then spread evenly with an applicator. After 60 minutes at 45°C, the changes on the plate groove surface were observed, and it was found that a uniform film was obviously formed in the plate groove, and the film did not crack after another 60 minutes, indicating that the deodorant solution prepared from poly (vinyl alcohol-vinyl acetate-itaconic acid) modified with vinyl sulfonic acid has excellent film-forming properties.

[0045] The prepared deodorant solution was spread on a glass dish and dried under natural conditions (25°C). After forming a film, its film-forming properties were analyzed. At the same time, the mass M of the film of different samples under natural conditions was recorded. The prepared film was placed in a wind speed machine and the wind speed was adjusted to 15.2m / 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:

[0046] Table 1: Film formation time and wind erosion rate

[0047] Example 1 Example 2 Example 3 Example 4 Comparative Example 1 Wind erosion rate% 0.013 0.015 0.016 0.016 0.104

[0048] 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 and other electronegative groups contained in the homemade deodorant copolymer are discharged, which is beneficial 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-forming material, thereby improving the deodorization effect.

[0049] 2. Deodorization performance evaluation

[0050] In a certain landfill, the composite intelligent detector tested the presence of the following gas components: 113ppm ammonia, 25ppm hydrogen sulfide, and 27ppm methyl mercaptan. Under a sunny environment at 25°C, the same amount of deodorant solution was sprayed to different areas of the landfill. After 4 hours, the composite intelligent detector was used again to test the deodorizing effect of the deodorant solution of the above embodiment and comparative example. The results are shown in Table 2.

[0051] Table 2:

[0052] 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

[0053] As shown in Table 2, the deodorant solution prepared by the present invention has excellent deodorizing performance. The difference between Comparative Example 1 and Example 4 is that the compound of formula II structure is used, and the deodorizing performance is reduced without modification of vinyl sulfonic acid. The possible reason is that the lack of repulsion between the sulfonic acid group and the carboxyl group affects the stretching of the copolymer structure, resulting in reduced film-forming performance. The deodorant prepared by the example has good water solubility and film-forming performance by itself, without the need to add additional surfactants or film-forming substances, and the copolymer structure has a large number of hydroxyl groups, without the need to add moisturizers, and is simple to use when applied to deodorization, and has strong applicability.

[0054] 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 familiar with the art. Therefore, without departing from the spirit and scope of the general concept defined by the claims and the equivalent scope, the present invention is not limited to specific details, representative schemes and described embodiments.

Claims

1. A degradable green 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: It 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 method comprises atomizing and spraying the degradable green and environmentally friendly deodorant aqueous solution as claimed in claim 1 onto the surface of the construction site to form a protective film layer on the surface of the object to be constructed.

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

7. The deodorizing method according to claim 5, characterized in that: The water-soluble plant extract is selected from at least one of green tea water extract, wormwood water extract and liquorice water extract.

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

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

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

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