阅读说明：本技术 一种添加香料的空气清新剂 (Air freshener added with spice ) 是由 王天义 梁立冬 张政 王毅 仝丹丹 于 2021-09-24 设计创作，主要内容包括：本发明公开了一种添加香料的空气清新剂,属于香薰产品技术领域。且所述空气清新剂包括以下组分：缓释前驱体溶液、植物精油、复合香料、乙醇、凝胶剂溶液。所述缓释前驱体溶液是以海藻酸钠和果胶为凝胶囊壁材料的溶胶-凝胶溶液,其中,针对海藻酸钠进行了化学改性和混合改性,化学改性为海藻酸钠的酰胺化,以降低其亲水性,增加其疏水结构,提高其与香料、植物精油的分子的吸附能力；其次,利用稻壳炭对海藻酸钠进行填充改性,增强海藻酸钠的机械强度,提高缓释能力；最后,加入的稻壳炭的多孔结构对空气中的臭味、污染颗粒具有吸附作用,增加空气清新剂的清洁空气的性能。(The invention discloses an air freshener added with spice, and belongs to the technical field of aromatherapy products. And the air freshener comprises the following components: sustained-release precursor solution, plant essential oil, compound perfume, ethanol, and gel solution. The slow-release precursor solution is a sol-gel solution taking sodium alginate and pectin as gel capsule wall materials, wherein the sodium alginate is subjected to chemical modification and mixed modification, and the chemical modification is amidation of the sodium alginate so as to reduce the hydrophilicity of the sodium alginate, increase the hydrophobic structure of the sodium alginate and improve the adsorption capacity of the sodium alginate with molecules of spice and plant essential oil; secondly, the rice husk carbon is used for filling and modifying the sodium alginate, so that the mechanical strength of the sodium alginate is enhanced, and the slow release capacity is improved; finally, the added rice husk carbon has an adsorption effect on odor and pollution particles in the air, and the air cleaning performance of the air freshener is improved.)

1. An air freshener added with spice, which is characterized in that: the paint comprises the following components in parts by weight: 15-30 parts of slow-release precursor solution, 0.1-1 part of plant essential oil, 0.1-1.5 parts of compound spice, 0.1-2 parts of ethanol and 50-100 parts of gel solution;

the slow-release precursor solution is prepared by the following steps:

adding amphiphilic sodium alginate into deionized water, heating to dissolve completely, adding emulsifier and pectin at 50-100r/min, stirring for 20-30min, dropwise adding rice hull carbon dispersion, and ultrasonically dispersing for 20-40min to obtain sustained-release precursor solution.

2. A fragrance-added air freshener in accordance with claim 1, wherein: the slow-release precursor solution comprises the following raw materials in parts by weight: 0.5-2.5 parts of pectin, 1-3.5 parts of emulsifier, 35-55 parts of amphiphilic sodium alginate, 85-115 parts of deionized water and 6-15 parts of rice hull carbon dispersion liquid.

3. A fragrance-added air freshener in accordance with claim 1, wherein: the amphiphilic sodium alginate is prepared by the following steps:

stirring sodium alginate and deionized water until the sodium alginate is completely dissolved, then dropwise adding a mixture of NHS and EDC & HCl, uniformly mixing, adjusting the pH of the solution to 3.5-4, continuously stirring and activating for 40-80min to obtain a mixed solution, heating to 45 ℃, adding hexylamine into the mixed solution, stirring and reacting for 2h, and performing post-treatment to obtain the amphiphilic sodium alginate.

4. A fragrance-added air freshener according to claim 3 wherein: the mass ratio of the sodium alginate to the deionized water to the mixture of NHS and EDC & HCl to the hexylamine is 2-6: 50-100: 0.3-0.8: 1-3, the molar ratio of NHS to EDC & HCl in the mixture of NHS and EDC & HCl is 1: 1.

5. a fragrance-added air freshener in accordance with claim 1, wherein: the rice husk carbon dispersion liquid is prepared by the following steps:

s1, uniformly mixing the rice hulls with the zinc chloride solution, putting the mixture into a constant-temperature drying box at 113 ℃, drying and primarily carbonizing the mixture for 30min, then putting the mixture into a muffle furnace, heating the mixture to 510 ℃, keeping the temperature for 60min, cooling the mixture to room temperature by using nitrogen, finally washing the mixture by using deionized water, drying, grinding and sieving the mixture to obtain rice hull carbon;

s2, adding the rice husk charcoal into a NaOH solution with the mass fraction of 5-10%, and stirring for 20-40min to obtain a rice husk charcoal suspension.

6. A fragrance-added air freshener in accordance with claim 5, wherein: in the step S1, the mass ratio of the rice hull to the zinc chloride solution is 1: 1-2.

7. A fragrance-added air freshener in accordance with claim 5, wherein: the mass fraction of the rice husk charcoal in the rice husk charcoal suspension in step S2 is 15-35%.

8. A fragrance-added air freshener in accordance with claim 1, wherein: the gel solution is a divalent metal cation chloride aqueous solution, the mass concentration of the divalent metal cation chloride aqueous solution is 1-5%, and the divalent metal cation is one of calcium ions and zinc ions.

Technical Field

The invention belongs to the technical field of aromatherapy products, and particularly relates to an air freshener added with spice.

Background

With the development of economy and the improvement of the living standard of people's materials, people have higher and higher requirements on the surrounding environment. Has fresh air, can eliminate fatigue, relax tense body and mind, and is beneficial to body and mind health. Thus, air fresheners are becoming increasingly popular with consumers as "environmental perfumes" to improve air. The following air fresheners are currently available: solid air fresheners, volatile liquid air fresheners, spray type air fresheners, aerosol type air fresheners, and the like.

Among them, the solid air fresheners appeared in the early 70 s abroad at the earliest, and are mainly used in cars, household bedrooms or living rooms, hotels and restaurants and other public entertainment places. The preparation principle of the product is that the perfume, the deodorant and the disinfectant are mixed with the components of water, the thickening agent, the preservative, the emulsifier and the like, the water and the thickening agent form solid jelly, the jelly contains the perfume, the deodorant and the disinfectant, and then the perfume, the deodorant and the disinfectant are slowly diffused into the air, so that the purposes of making the air fragrant and fresh are achieved.

However, the solid aromatic agents on the market at present have poor controlled release capacity on the perfume, and the performance of releasing the perfume is unstable, so that the solid aromatic agents have strong fragrance in the early stage of use, light fragrance in the middle stage and difficult fragrance in the later stage of use.

Therefore, the present invention provides an air freshener to which a perfume is added to provide an air freshener whose release-sustaining ability is stable.

Disclosure of Invention

The invention aims to provide an air freshener added with a spice.

The technical problems to be solved by the invention are as follows: the problem that the existing air freshener has poor capability of controlling the release of the perfume.

The purpose of the invention can be realized by the following technical scheme:

an air freshener added with perfume comprises the following components in parts by weight: 15-30 parts of slow-release precursor solution, 0.1-1 part of plant essential oil, 0.1-1.5 parts of compound spice, 0.1-2 parts of ethanol and 50-100 parts of gel solution.

Further, the plant essential oil is rosemary essential oil, lemon essential oil and mint essential oil according to a mass ratio of 1-3: 1.2-2.6: 0.1-1.

Further, the composite spice is coconut aldehyde, propyl decalactone and butyl dodecalactone according to the mass ratio of 0.1-1: 0.2-1: 0.4-1.

Further, the slow-release precursor solution comprises the following raw materials in parts by weight: 0.5-2.5 parts of pectin, 1-3.5 parts of emulsifier, 35-55 parts of amphiphilic sodium alginate, 85-115 parts of deionized water and 6-15 parts of rice hull carbon dispersion liquid.

Further, the emulsifier is one of polyoxyethylene sorbitan fatty acid ester and alkyl glycoside.

Further, the amphiphilic sodium alginate is prepared by the following steps:

adding sodium alginate and deionized water into a three-neck flask, heating to 35 ℃, stirring until the sodium alginate is completely dissolved, then dropwise adding a mixture of NHS and EDC & HCl, uniformly mixing, adjusting the pH of the solution to 3.5-4 by using a hydrochloric acid solution, continuously stirring and activating for 40-80min to obtain a mixed solution, heating to 45 ℃, adding hexylamine into the mixed solution, stirring and reacting for 2h, then precipitating by using absolute ethyl alcohol, centrifuging, washing for 2-3 times, drying the precipitate at 50-60 ℃ to constant weight to obtain the amphiphilic sodium alginate, wherein the adding mass ratio of the mixture of the sodium alginate, the deionized water, the NHS and EDC & HCl to the hexylamine is 2-6: 50-100: 0.3-0.8: 1-3, the molar ratio of NHS to EDC & HCl in the mixture of NHS and EDC & HCl is 1: 1.

in the reaction, the reaction of carboxyl in sodium alginate and amino in hexylamine is utilized to perform amidation modification on sodium alginate, reduce the hydrophilicity of sodium alginate, increase the hydrophobic structure of sodium alginate, and improve the adsorption capacity of sodium alginate with molecules of perfume and plant essential oil.

Further, the rice husk carbon dispersion liquid is prepared by the following steps:

s1, uniformly mixing the rice hulls with a zinc chloride solution with the mass fraction of 40-60%, putting the mixture into a constant-temperature drying box with the temperature of 113 ℃ for drying and primary carbonization for 30min, then putting the mixture into a muffle furnace, heating the mixture to 510 ℃ at the speed of 10 ℃/min, keeping the temperature for 60min, introducing nitrogen at the flow rate of 240mL/min to cool a reaction system to the room temperature, finally washing the reaction system with deionized water, drying, grinding, and sieving with a 100-mesh sieve to obtain rice hull carbon, wherein the mass ratio of the rice hulls to the zinc chloride solution with the mass fraction of 40-60% is 1: 1-2;

s2, adding the rice husk charcoal into a NaOH solution with the mass fraction of 5-10%, and stirring for 20-40min to obtain a rice husk charcoal suspension, wherein the mass fraction of the rice husk charcoal in the rice husk charcoal suspension is 15-35%.

Further, the slow-release precursor solution is prepared by the following steps:

adding amphiphilic sodium alginate into deionized water, slowly heating until the amphiphilic sodium alginate is completely dissolved, adding an emulsifier and pectin at 50-100r/min, stirring for 20-30min, dropwise adding a rice hull carbon dispersion liquid, and ultrasonically dispersing for 20-40min after complete dropwise adding to obtain a slow-release precursor solution.

In the reaction, the rice husk carbon is used as a reinforcing filler of the sodium alginate, the surface of the pyrolyzed rice husk carbon is utilized to have a gap structure, and a molecular chain of the sodium alginate can be embedded in the gaps, so that the movement and expansion of the molecular chain of the sodium alginate are hindered, the reinforcing effect is achieved, the mechanical strength of the sodium alginate is improved, and the slow release performance of hydrogel formed by the sodium alginate is enhanced; meanwhile, the porous structure of the rice husk carbon has an adsorption effect on odor and pollution particles in the air, and the air cleaning performance of the air freshener is improved.

Further, the gel solution is a divalent metal cation chloride salt aqueous solution, the mass concentration of the divalent metal cation chloride salt aqueous solution is 1-5%, and the divalent metal cation is one of calcium ions and zinc ions.

An air freshener added with perfume is prepared by the following steps:

adding plant essential oil, ethanol and compound perfume into the slow-release precursor solution, and uniformly stirring to obtain a mixed solution;

and step two, dropwise adding the mixed solution into the gel solution under the stirring state, wherein the dropwise adding speed is 2-5 drops/second, continuously stirring for 30-50min after complete dropwise addition, filtering, washing with distilled water for 2-3 times, and performing vacuum freeze drying to obtain the air freshener added with the perfume.

The invention has the beneficial effects that:

aiming at the problem that the existing air freshener has poor controlled release capacity on perfume, a slow release precursor solution is introduced, plant essential oil and the perfume are mixed, the slow release precursor solution is gelatinized by using a gel solution, and hydrogel loaded with the plant essential oil and the perfume is obtained, namely the air freshener disclosed by the invention, in addition, the hydrogel takes sodium alginate and pectin as gel capsule wall materials, wherein the sodium alginate is subjected to chemical modification and mixed modification, the chemical modification is amidation of the sodium alginate, so that the hydrophilicity of the sodium alginate is reduced, the hydrophobic structure of the sodium alginate is increased, the adsorption capacity of the sodium alginate, the perfume and the molecules of the plant essential oil is improved (the hydrophobic structure can be stably adsorbed on the surfaces of the perfume and the particles of the plant essential oil), and the principle is explained that the hydrophobic structure is formed by winding an alkyl molecular chain and organic molecular chains of the perfume and the plant essential oil; secondly, the rice husk carbon is used for filling and modifying the sodium alginate, so that the mechanical strength of the sodium alginate is enhanced, and the slow release capacity of the obtained hydrogel is improved; finally, the added rice husk carbon has an adsorption effect on odor and pollution particles in the air, and the air cleaning performance of the air freshener is improved.

In conclusion, the air freshener provided by the invention has a good slow release effect on the perfume.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

Example 1:

the amphiphilic sodium alginate is prepared by the following steps:

adding 2g of sodium alginate and 50g of deionized water into a three-neck flask, heating to 35 ℃, stirring until the sodium alginate is completely dissolved, then dropwise adding 0.3g of a mixture of NHS and EDC & HCl (the molar ratio of NHS to EDC & HCl is 1: 1), uniformly mixing, adjusting the pH of the solution to 3.5-4 with a hydrochloric acid solution, continuously stirring and activating for 40min to obtain a mixed solution, heating to 45 ℃, adding 1g of hexylamine into the mixed solution, stirring and reacting for 2h, then precipitating with 70mL of anhydrous ethanol, centrifuging, washing with 70mL of anhydrous ethanol for 2 times, drying the precipitate at 50 ℃ to constant weight, and obtaining the amphiphilic sodium alginate.

Example 2:

adding 6g of sodium alginate and 100g of deionized water into a three-neck flask, heating to 35 ℃, stirring until the sodium alginate is completely dissolved, then dropwise adding 0.8g of a mixture of NHS and EDC & HCl (the molar ratio of NHS to EDC & HCl is 1: 1), uniformly mixing, adjusting the pH of the solution to 3.5-4 with a hydrochloric acid solution, continuously stirring and activating for 80min to obtain a mixed solution, heating to 45 ℃, adding 3g of hexylamine into the mixed solution, stirring and reacting for 2h, then precipitating with 100mL of absolute ethyl alcohol, centrifuging, washing with 100mL of absolute ethyl alcohol for 2 times, drying the precipitate at 50 ℃ to constant weight, and obtaining the amphiphilic sodium alginate.

Example 3:

the rice husk carbon dispersion liquid is prepared by the following steps:

s1, uniformly mixing 10g of rice hulls with 15g of zinc chloride solution with the mass fraction of 40%, putting the mixture into a constant-temperature drying oven with the temperature of 113 ℃ for drying and primary carbonization for 30min, then putting the mixture into a muffle furnace, heating the mixture to 510 ℃ at the speed of 10 ℃/min, keeping the temperature for 60min, introducing nitrogen at the flow rate of 240mL/min to cool a reaction system to the room temperature, finally flushing the reaction system with 50mL of deionized water, drying, grinding, and sieving with a 100-mesh sieve to obtain rice hull carbon;

s2, adding the rice husk charcoal into a NaOH solution with the mass fraction of 5%, and stirring for 40min to obtain a rice husk charcoal suspension, wherein the mass fraction of the rice husk charcoal in the rice husk charcoal suspension is 15%.

Example 4:

the rice husk carbon dispersion liquid is prepared by the following steps:

s1, uniformly mixing 10g of rice hulls with 20g of zinc chloride solution with the mass fraction of 60%, putting the mixture into a constant-temperature drying oven with the temperature of 113 ℃ for drying and primary carbonization for 30min, then putting the mixture into a muffle furnace, heating the mixture to 510 ℃ at the speed of 10 ℃/min, keeping the temperature for 60min, introducing nitrogen at the flow rate of 240mL/min to cool a reaction system to the room temperature, finally washing the reaction system with 80mL of deionized water, drying, grinding, and sieving with a 100-mesh sieve to obtain rice hull carbon;

s2, adding the rice husk charcoal into a NaOH solution with the mass fraction of 10%, and stirring for 20min to obtain a rice husk charcoal suspension, wherein the mass fraction of the rice husk charcoal in the rice husk charcoal suspension is 35%.

Example 5:

the slow-release precursor solution is prepared by the following steps:

a1, weighing the following raw materials by weight: 0.5g of pectin, 1g of emulsifier, 35g of amphiphilic sodium alginate prepared in example 1, 85g of deionized water and 6g of rice hull carbon dispersion liquid prepared in example 3, wherein the emulsifier is polyoxyethylene sorbitan fatty acid ester;

a2, adding amphiphilic sodium alginate into deionized water, slowly heating until the amphiphilic sodium alginate is completely dissolved, adding an emulsifier and pectin at the speed of 50r/min, stirring for 30min, dropwise adding a rice hull carbon dispersion liquid, and ultrasonically dispersing for 20min after complete dropwise adding to obtain a slow-release precursor solution.

Example 6:

the slow-release precursor solution is prepared by the following steps:

a1, weighing the following raw materials by weight: 2.5g of pectin, 3.5g of an emulsifier, 55g of amphiphilic sodium alginate prepared in example 2, 115g of deionized water and 15g of rice hull carbon dispersion liquid prepared in example 4, wherein the emulsifier is alkyl glycoside;

a2, adding amphiphilic sodium alginate into deionized water, slowly heating until the amphiphilic sodium alginate is completely dissolved, adding an emulsifier and pectin at 100r/min, stirring for 20min, dropwise adding a rice hull carbon dispersion liquid, and ultrasonically dispersing for 40min after complete dropwise adding to obtain a slow-release precursor solution.

Example 7:

an air freshener added with perfume is prepared by the following steps:

step one, weighing the following components in parts by weight: 150g of the slow-release precursor solution prepared in example 5, 1.5g of plant essential oil, 1g of compound perfume, 1g of ethanol and 500g of gel solution, wherein the plant essential oil is rosemary oil, lemon essential oil and mint essential oil according to a mass ratio of 1: 1.2: 1.5, wherein the composite spice is prepared by mixing coconut aldehyde, propyl decalactone and butyl dodecalactone according to the mass ratio of 0.1: 0.2: 0.4 mixing;

adding the plant essential oil, the ethanol and the compound perfume into the slow-release precursor solution, and uniformly stirring to obtain a mixed solution;

and step three, dropwise adding the mixed solution into the gel solution under the stirring state, wherein the dropwise adding speed is 2 drops/second, continuously stirring for 30min after the dropwise adding is completed, filtering, washing with distilled water for 2 times, and carrying out vacuum freeze drying to obtain the air freshener added with the perfume.

Example 8:

an air freshener added with perfume is prepared by the following steps:

step one, weighing the following components in parts by weight: 200g of the slow-release precursor solution prepared in the embodiment 5, 5g of plant essential oil, 10g of compound spice, 10g of ethanol and 700g of gel solution, wherein the plant essential oil is rosemary oil, lemon essential oil and mint essential oil according to a mass ratio of 2: 1.2: 0.3, and the composite spice is prepared by mixing coconut aldehyde, propyl decalactone and butyl dodecalactone according to a mass ratio of 4: 5: 6, mixing;

adding the plant essential oil, the ethanol and the compound perfume into the slow-release precursor solution, and uniformly stirring to obtain a mixed solution;

and step three, dropwise adding the mixed solution into the gel solution under the stirring state, wherein the dropwise adding speed is 3 drops/second, continuously stirring for 40min after the dropwise adding is completed, filtering, washing with distilled water for 3 times, and carrying out vacuum freeze drying to obtain the air freshener added with the perfume.

Example 9:

an air freshener added with perfume is prepared by the following steps:

step one, weighing the following components in parts by weight: 300g of the slow-release precursor solution prepared in the embodiment 5, 10g of plant essential oil, 15g of compound spice, 20g of ethanol and 1000g of gel solution, wherein the plant essential oil is rosemary oil, lemon essential oil and mint essential oil according to a mass ratio of 3: 2.6: 1, and the composite spice is prepared by mixing coconut aldehyde, propyl decalactone and butyl dodecalactone according to a mass ratio of 1: 1: 1, mixing;

adding the plant essential oil, the ethanol and the compound perfume into the slow-release precursor solution, and uniformly stirring to obtain a mixed solution;

and step three, dropwise adding the mixed solution into the gel solution under the stirring state, wherein the dropwise adding speed is 5 drops/second, continuously stirring for 50min after the dropwise adding is completed, filtering, washing with distilled water for 3 times, and carrying out vacuum freeze drying to obtain the air freshener added with the perfume.

Comparative example 1:

the slow-release precursor solution is prepared by the following steps:

a1, weighing the following raw materials by weight: 0.5g of pectin, 1g of emulsifier, 35g of sodium alginate, 85g of deionized water and 6g of the rice hull carbon dispersion liquid prepared in the embodiment 3, wherein the emulsifier is polyoxyethylene sorbitan fatty acid ester;

a2, adding sodium alginate into deionized water, slowly heating until the sodium alginate is completely dissolved, adding an emulsifier and pectin at a speed of 50r/min, stirring for 30min, dropwise adding a rice hull carbon dispersion liquid, and ultrasonically dispersing for 20min after complete dropwise adding to obtain a sustained-release precursor solution.

Comparative example 2:

the slow-release precursor solution is prepared by the following steps:

a1, weighing the following raw materials by weight: 2.5g of pectin, 3.5g of emulsifier, 55g of amphiphilic sodium alginate prepared in example 2 and 115g of deionized water, wherein the emulsifier is alkyl glycoside;

a2, adding amphiphilic sodium alginate into deionized water, slowly heating until the amphiphilic sodium alginate is completely dissolved, adding an emulsifier and pectin at 100r/min, stirring for 20min, dropwise adding a rice hull carbon dispersion liquid, and ultrasonically dispersing for 40min after complete dropwise adding to obtain a slow-release precursor solution.

Comparative example 3:

an air freshener added with perfume is prepared by the following steps:

step one, weighing the following components in parts by weight: 150g of slow-release precursor solution prepared in comparative example 1, 1.5g of plant essential oil, 1g of compound spice, 1g of ethanol and 500g of gel solution, wherein the plant essential oil is rosemary oil, lemon essential oil and mint essential oil according to the mass ratio of 1: 1.2: 1.5, wherein the composite spice is prepared by mixing coconut aldehyde, propyl decalactone and butyl dodecalactone according to the mass ratio of 0.1: 0.2: 0.4 mixing;

step two, the same as step two in example 7;

and step three, the same as the step three in the embodiment 7, and the air freshener added with the spice is obtained.

Comparative example 4:

an air freshener added with perfume is prepared by the following steps:

step one, weighing the following components in parts by weight: 200g of slow-release precursor solution prepared in comparative example 2, 5g of plant essential oil, 10g of compound spice, 10g of ethanol and 700g of gel solution, wherein the plant essential oil is rosemary oil, lemon essential oil and mint essential oil according to a mass ratio of 2: 1.2: 0.3, and the composite spice is prepared by mixing coconut aldehyde, propyl decalactone and butyl dodecalactone according to a mass ratio of 4: 5: 6, mixing;

step two, the same as step two in example 8;

and step three, the same as the step three in the embodiment 8, and the air freshener added with the spice is obtained.

Example 10:

the air fresheners obtained in examples 7 to 9 and comparative examples 3 to 4 were weighed for weight loss after 7 days in a hot air environment at 40 ℃, and the aroma substance retention rate (a) after 7 days was calculated as shown in table 1;

the air fresheners obtained in examples 7 to 9 and comparative examples 3 to 4 were heated at 65 ℃ every 1min from 1min up to 10min, the weight of the air freshener was recorded, and the results of calculating the change with time of the fragrance substance retention rate (a) are shown in tables 2 to 6;

the retention rate of the fragrant substance was calculated according to the following formula: the retention rate (a) of the aroma substances is (initial mass of the air freshener-mass of the air freshener after weight loss)/theoretical input mass of the aroma substances is multiplied by 100 percent;

table 2 shows the aroma retention (a) versus time for example 7 heated at 65 ℃ for 10 min;

table 3 shows the aroma retention (a) versus time for example 8 heated at 65 ℃ for 10 min;

table 4 shows the aroma retention (a) versus time for example 9 heated at 65 ℃ for 10 min;

table 5 shows the relationship between the retention rate (a) of the fragrant substance and the time in comparative example 3 heated at 65 ℃ for 10 min;

table 6 shows the aroma retention (a) versus time for comparative example 4 heated at 65 ℃ for 10 min.

TABLE 1

	Example 7	Example 8	Example 9	Comparative example 3	Comparative example 4
						a	96.1％	97.4％	98.3％	83.5％	77.9％

TABLE 2

	1min	2min	3min	4min	5min
						a	99.3％	98.4％	97.3％	86.1％	94.9％
	6min	7min	8min	9min	10min
						a	93.6％	92.0％	90.6％	89.1％	87.7％

TABLE 3

	1min	2min	3min	4min	5min
						a	98.8％	97.5％	96.1％	95.0％	93.8％
	6min	7min	8min	9min	10min
						a	92.4％	91.1％	89.3％	87.9％	86.2％

TABLE 4

TABLE 5

	1min	2min	3min	4min	5min
						a	97.1％	94.3％	91.7％	88.6％	85.2％
	6min	7min	8min	9min	10min
						a	82.6％	79.5％	74.7％	70.6％	65.2％

TABLE 6

	1min	2min	3min	4min	5min
						a	96.4％	92.5％	88.7％	84.9％	81.2％
	6min	7min	8min	9min	10min
						a	77.1％	73.5％	69.7％	65.6％	61.2％

It can be seen from the data in table 1 that the aroma substance retention rate (a) of the air fresheners obtained in examples 7 to 9 is significantly higher than that (a) of the air fresheners obtained in comparative examples 3 to 4, which indicates that the sustained-release precursor solution added in the invention has wrapped plant essential oil and aroma under the action of the gel solution, and the obtained wrapped matter (air fresheners) has good controlled-release capability;

from the comparison of the data of tables 2 to 4 with the data of tables 5 to 6, it can be shown that the good controlled-release ability of the air freshener of the present invention is due to the interaction of the amphiphilic sodium alginate and the rice husk charcoal.

In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The foregoing is illustrative and explanatory only and is not intended to be exhaustive or to limit the invention to the precise embodiments described, and various modifications, additions, and substitutions may be made by those skilled in the art without departing from the scope of the invention or exceeding the scope of the claims.