阅读说明：本技术 一种多孔精油缓释载体及其制备方法和应用 (Porous essential oil slow-release carrier and preparation method and application thereof ) 是由 王丽 于 2021-11-08 设计创作，主要内容包括：本发明公开了一种多孔精油缓释载体,所述缓释载体为可用于加湿器释放精油的聚烯烃发泡材料；所述聚烯烃发泡材料的泡孔尺寸为1-10μm,孔隙率为30％～70％；形成所述聚烯烃发泡材料的聚烯烃树脂的熔融指数为0.1～3g/10min。该多孔精油缓释载体具有在水中不溶,且能够缓释精油的特点,在保护雾化器的同时,延长精油的释放时间,同时减少过量精油对使用者健康的影响,可解决加湿器中添加芳香性精油时有效时间短,且需要时常清理或更换的缺陷。本发明还公开了该多孔精油缓释载体的制备方法和应用。(The invention discloses a porous essential oil slow-release carrier, which is a polyolefin foaming material capable of being used for releasing essential oil by a humidifier; the size of the foam pores of the polyolefin foam material is 1-10 mu m, and the porosity is 30% -70%; the melt index of the polyolefin resin forming the polyolefin foam material is 0.1-3 g/10 min. The porous essential oil slow release carrier has the characteristics of insolubility in water and capability of slowly releasing essential oil, the atomizer is protected, the release time of the essential oil is prolonged, the influence of excessive essential oil on the health of a user is reduced, and the defects that the effective time is short and the humidifier needs to be cleaned or replaced frequently when aromatic essential oil is added can be overcome. The invention also discloses a preparation method and application of the porous essential oil slow-release carrier.)

1. The porous essential oil slow-release carrier is characterized in that the slow-release carrier is a polyolefin foam material;

the size of the foam pores of the polyolefin foam material is 1-10 mu m, and the porosity is 30% -70%;

the melt index of the polyolefin resin forming the polyolefin foam material is 0.1-3 g/10 min.

2. The porous essential oil slow release carrier according to claim 1, wherein the polyolefin foam material is a polyethylene foam material or a polypropylene foam material.

3. The porous essential oil slow-release carrier according to claim 1, wherein the polyolefin foaming material is prepared from raw materials comprising polyolefin resin, a foaming agent, a cross-linking agent and a nucleating agent through a foaming process;

wherein, the polyolefin resin comprises 5 to 20 percent of foaming agent, 1 to 5 percent of cross-linking agent and 1 to 5 percent of nucleating agent by the total mass percentage of the polyolefin resin in the raw materials.

4. The porous essential oil slow release carrier according to claim 3, wherein the foaming agent is selected from one or more of water, ethanol, carbon dioxide, propane, isopropane and cyclopentane;

the cross-linking agent is selected from one or more of hydrogen peroxide di-tert-butyl, dicumyl peroxide, 2, 5-dimethyl-2, 5-di-tert-butyl hexane peroxide;

the nucleating agent is selected from one or more of talcum powder, calcium carbonate, silicon dioxide, titanium dioxide and magnesium oxide.

5. The porous essential oil slow-release carrier according to claim 3, characterized in that the raw materials further comprise 1-3% of an antioxidant in percentage by total mass of polyolefin;

preferably, the antioxidant is selected from one or more of antioxidant 168, antioxidant 264 or antioxidant 1010.

6. The method for preparing the porous carrier for the slow release of essential oil according to any one of claims 1 to 5, comprising the steps of:

uniformly mixing the raw materials, heating for foaming, and cooling to obtain the porous essential oil slow-release carrier for the humidifier;

preferably, the foaming is obtained by heat preservation for 1-3 min at the temperature of 180-230 ℃.

7. Use of a porous essential oil slow release carrier as claimed in any one of claims 1 to 5 for the release of essential oils for humidifiers.

8. Use according to claim 7, wherein the porous essential oil slow release carrier is used in the release of essential oils for nebulization humidifiers.

9. The application according to claim 7, characterized in that it comprises the following steps:

applying an essential oil to the porous essential oil slow release carrier;

and placing the porous essential oil slow-release carrier loaded with the essential oil in a humidifier.

10. The use according to claim 9, wherein the essential oil is added in an amount of 10-60% by mass of the porous essential oil slow-release carrier.

Technical Field

The present invention relates to the field of porous polymeric materials. More particularly, relates to a porous essential oil slow-release carrier, a preparation method and application thereof.

Background

The humidifier is a household appliance which can enable air to have a humidifying effect, and enables indoor relative humidity to be kept between 40% and 60% by releasing a certain amount of water mist into the air, so that comfort and health of people in living and working environments can be greatly guaranteed. Generally classified into three categories according to the principle of humidification: a thermal humidification type, a fan humidification type, and an ultrasonic humidification type. Meanwhile, with the increasingly improved living standard of people, the requirements of people on living environment are continuously improved, and aromatic essential oil with multiple functions of refreshing air, relieving pressure, expelling insects, helping sleep and the like is added into a humidifier and gradually becomes a living habit.

The humidifier can be designed into various types according to different places, different forms and different requirements. A common humidifier consists of a container containing a liquid, an atomizer to atomize the liquid therein, and a liquid delivery system. Especially, the atomizer can make the aromatic essential oil disperse along with the water mist when adding the aromatic essential oil into the water. However, the surface tension and viscosity of the aromatic essential oil can affect the atomization effect, so that when the aromatic essential oil is used as an additive in a humidifier, the atomizer or the water absorption fiber component needs to be cleaned frequently, the use is inconvenient, and the use cost is increased.

Disclosure of Invention

The first purpose of the invention is to provide a porous essential oil slow release carrier, which has the characteristics of insolubility in water and slow release of essential oil, prolongs the release time of essential oil while protecting an atomizer in a humidifier, reduces the influence of excessive essential oil on the health of a user, and can overcome the defects of short effective time and frequent cleaning or replacement when aromatic essential oil is added into the humidifier.

The second purpose of the invention is to provide a preparation method of the porous essential oil slow-release carrier.

The third purpose of the invention is to provide the application of the porous essential oil slow-release carrier in the humidifier.

In order to achieve the first purpose, the invention adopts the following technical scheme:

a porous essential oil slow release carrier, which is a polyolefin foaming material;

the size of the foam pores of the polyolefin foam material is 1-10 mu m, and the porosity is 30% -70%;

the melt index of the polyolefin resin forming the polyolefin foam material is 0.1-3 g/10 min.

Further, the polyolefin foam material is a polyethylene foam material or a polypropylene foam material.

Further, the polyolefin foam material is prepared from raw materials comprising polyolefin resin, a foaming agent, a cross-linking agent and a nucleating agent through a foaming process;

wherein, the polyolefin resin comprises 5 to 20 percent of foaming agent, 1 to 5 percent of cross-linking agent and 1 to 5 percent of nucleating agent by the total mass percentage of the polyolefin resin in the raw materials.

Further, the polyolefin resin is selected from PE (e.g. HDPE), PP resin.

Further, the foaming agent is selected from one or more of water, ethanol, carbon dioxide, propane, isopropane and cyclopentane.

Further, the cross-linking agent is selected from one or more of di-tert-butyl hydroperoxide, dicumyl peroxide, 2, 5-dimethyl-2, 5-di (tert-butylperoxy) hexane.

Further, the nucleating agent is selected from one or more of talcum powder, calcium carbonate, silicon dioxide, titanium dioxide and magnesium oxide.

Further, the raw materials further comprise 1-3% of an antioxidant in percentage by total mass of the polyolefin.

Further, the antioxidant is selected from one or more of antioxidant 168, antioxidant 264 or antioxidant 1010.

In order to achieve the second purpose, the invention adopts the following technical scheme:

a preparation method of a porous essential oil slow-release carrier comprises the following steps:

and uniformly mixing the raw materials, heating for foaming, and cooling to obtain the porous essential oil slow-release carrier.

Further, the foaming is carried out for 1-3 min at the temperature of 180-230 ℃.

To achieve the third object, the present invention also provides the use of the porous essential oil sustained release carrier according to the first object for the release of essential oil.

Further, the porous essential oil slow release carrier is used for releasing essential oil for the atomizing humidifier.

Further, the application comprises the steps of:

applying an essential oil to the porous essential oil slow release carrier;

and placing the porous essential oil slow-release carrier loaded with the essential oil in a humidifier.

Further, the essential oil is aromatic essential oil.

Further, the addition amount of the essential oil is 10-60% of the mass of the porous essential oil slow-release carrier.

Further, the addition amount of the essential oil is 10-40% of the mass of the porous essential oil slow-release carrier.

The invention has the following beneficial effects:

the porous essential oil slow release carrier provided by the invention adopts a specific resin matrix and composition, has good hydrophobicity and lipophilicity, can be used as the porous essential oil slow release carrier for the humidifier, solves the problem that an atomizing sheet is easy to block or essential oil is stuck to the inner wall of a humidifier container when the existing humidifier atomizes essential oil, ensures the strength of a base material due to low aperture ratio, and solves the problem of essential oil precipitation in the transportation process. Meanwhile, the carrier can be repeatedly used for many times.

Drawings

The following describes embodiments of the present invention in further detail with reference to the accompanying drawings.

Fig. 1 shows an SEM image of HDPE-based foamed essential oil adsorption carrier prepared in example 1.

FIG. 2 shows a comparison between the time when the porous adsorption sustained release carrier is soaked in the essential oil and the time when the porous adsorption sustained release carrier is soaked in the essential oil in example 1; b shows the comparison in water before and after the direct addition of essential oil and adsorption of the carrier; c shows the adsorption state of the water-absorbing fiber in different solutions; d shows the pictures of the water-absorbing fibers before and after soaking.

Fig. 3 shows the time course of the concentration of essential oil in the carrier after the carrier is used in the humidifier in example 1.

Figure 4 shows an SEM image of HDPE-based foamed essential oil adsorbent carrier prepared in example 2.

Fig. 5 shows the time course of the concentration of essential oil in the carrier after the carrier was used in the humidifier in example 2.

Fig. 6 shows an SEM image of HDPE-based foamed essential oil adsorbent carrier prepared in example 3.

Fig. 7 shows the time course of the concentration of essential oil in the carrier after the carrier was used in the humidifier in example 3.

Fig. 8 shows an SEM image of the PS-based foaming essential oil adsorption carrier prepared in comparative example 1.

Fig. 9 shows the time course of the concentration of the essential oil in the carrier after the carrier in comparative example 1 was used in the humidifier.

Detailed Description

In order to more clearly illustrate the invention, the invention is further described below with reference to preferred embodiments and the accompanying drawings. Similar parts in the figures are denoted by the same reference numerals. It is to be understood by persons skilled in the art that the following detailed description is illustrative and not restrictive, and is not to be taken as limiting the scope of the invention.

Example 1

A preparation method of a porous essential oil slow-release carrier comprises the following steps:

based on the total mass percentage of the HDPE resin, firstly, mixing HDPE resin (with a melt index of 0.9g/10min) powder with 5% of water, then putting 3% of silicon dioxide particles, 1% of dicumyl peroxide and 1% of antioxidant 168 into the resin matrix, and placing the mixture into a high-speed mixer for blending. And adding the uniformly mixed materials into a mold cavity, heating to 190 ℃, and keeping the temperature for 2 min. The temperature rise can cause the vaporization of the foaming agent, so as to cause thermodynamic instability, induce the formation and the growth of bubbles, and the merging and the collapse of foam holes, and after shaping, the essential oil slow release carrier for the humidifier is prepared. The porosity measured by a porosity, water absorption and density tester of the porous product is 38.5 percent

The SEM image of the obtained essential oil slow-release carrier is shown in figure 1, and as can be seen from figure 1, the treated HDPE material forms a uniform cell structure, the cell size is 2-5 mu m, the higher opening rate can ensure the mechanical strength of the base material, so that the adsorbed essential oil is not extruded in the transportation process, and the HDPE material can effectively adsorb the essential oil material and achieve the slow-release effect in water due to the hydrophobic and oleophylic characteristics of the HDPE material.

Soaking the slow release carrier in gardenia essential oil, wherein the result is shown in fig. 2(a), the carrier which does not adsorb the porous essential oil is white (left), and the carrier which adsorbs the porous essential oil is changed into yellow (right) with uniform color, namely the slow release carrier of the porous essential oil can uniformly adsorb the essential oil;

the essential oil and the carrier after adsorbing the essential oil are respectively soaked in water (the application amount of the essential oil is the same), and the result is shown in fig. 2(b), after the essential oil is directly added into the water, the essential oil is dispersed and floats on the water surface (left), so that the atomization effect of the water in the humidifier is influenced; after the carrier adsorbing the essential oil is added into water, the whole body floats on the water surface, and the essential oil is concentrated on the carrier (right).

Further, as shown in fig. 2(c), water-absorbing fibers of the same size and the same material are placed in the water in which the essential oil is dispersed (left) and the water in which the carrier of the essential oil is adsorbed (right), respectively, and after a certain period of adsorption, the water-absorbing fibers are taken out, and as shown in fig. 2(d), it is known that, when the essential oil is directly dispersed in the water, part of the essential oil is adsorbed into the water-absorbing fibers and the essential oil cannot be completely adsorbed, and when the essential oil is used in a humidifier, the water-absorbing fibers cannot normally function (left); while in the water with the essential oil adsorbed carrier, the water-absorbing fiber does not adsorb the essential oil (right). Therefore, the carrier has good hydrophobicity and lipophilicity, and can well improve the problem that the essential oil is stained on the inner wall of a humidifier container.

The porous essential oil slow-release carrier prepared by the method is used in an atomization humidifier, and the specific method comprises the following steps:

soaking the required carrier into the gardenia essential oil, and removing the redundant essential oil adhered to the surface after the essential oil is completely adsorbed; the carrier absorbed with the essential oil is placed in a water tank of an ultrasonic humidifier, so that the essential oil can be slowly released, and the carrier can be repeatedly used after the essential oil is released. The essential oil adsorption carrier is simple and easy to operate in a using method, and damage of the essential oil to the water absorption fibers or the atomizer can be effectively reduced.

As can be seen from FIG. 3, after the above-mentioned carrier is added to the humidifier, the essential oil content in the carrier begins to decrease after the humidifier is operated for 42 hours, and after 72 hours, the essential oil content in the carrier can still be maintained at 89.3% of the initial content.

And after the carrier does not smell the fragrance of the essential oil, adsorbing the essential oil fully and using the essential oil in a humidifier for recycling the carrier. After the humidifier is used repeatedly for 12 times, the concentration change of the essential oil is basically unchanged from the original concentration change after the humidifier works for 42 hours and 72 hours. Meanwhile, the problem of essential oil adsorption does not occur on the inner wall of the humidifier container, the atomizing sheet and the outlet.

Example 2

A preparation method of a porous essential oil slow-release carrier comprises the following steps:

based on the total mass percentage of the HDPE resin, firstly, the HDPE resin (the melt index is 2.4g/10min) is mixed with 7 percent of ethanol, and then 2 percent of titanium dioxide particles, 2 percent of hydrogen peroxide di-tert-butyl and 1.5 percent of antioxidant 264 are put into the resin matrix and are placed into a high-speed mixer for blending. Adding the uniformly mixed materials into a mold cavity, heating to 200 ℃, and keeping the temperature for 1 min. Shaping, and making into essential oil sustained release carrier for humidifier, wherein SEM figure is shown in figure 4.

The porosity measured by a porosity, water absorption and density tester of the porous product is 45.7 percent. The HDPE material after treatment forms a uniform cell structure, the cell size is uniform between 1-10 mu m, the lower opening rate can ensure the mechanical strength of the base material, so that the adsorbed essential oil is not extruded in the transportation process, and the HDPE material can effectively adsorb the essential oil material and achieve the slow release effect in water due to the hydrophobic oleophylic property of the HDPE material.

The carrier was applied to an aerosolizing humidifier as described in example 1, and the results are shown in fig. 5. As can be seen from the figure, after the carrier with the adsorbed essential oil is added into the humidifier, the content of the essential oil in the carrier begins to be reduced after the humidifier works for 36 hours, and the content of the essential oil in the carrier can still be maintained at 81.8% of the initial content after 72 hours.

And after the carrier does not smell the fragrance of the essential oil, adsorbing the essential oil fully and using the essential oil in a humidifier for recycling the carrier. After the humidifier is used repeatedly for 12 times, the concentration change of the essential oil is basically unchanged from the original concentration change after the humidifier works for 36 hours and 72 hours. Meanwhile, the problem of essential oil adsorption does not occur on the inner wall of the humidifier container, the atomizing sheet and the outlet.

Example 3

A preparation method of a porous essential oil slow-release carrier comprises the following steps:

according to the total mass percentage content of the PP resin, the PP resin (with the melt index of 1.8g/10min) is firstly mixed with 5 percent of water, then 3 percent of silicon dioxide particles, 1 percent of dicumyl peroxide and 1 percent of antioxidant 1010 are put into the resin matrix and are blended in a high-speed mixer. Adding the uniformly mixed materials into a mold cavity, heating to 200 ℃, and keeping the temperature for 1 min. The temperature rise can cause the foaming agent to be vaporized, so that thermodynamic instability is caused, the formation and the growth of bubbles are induced, the combination and the collapse of cells are induced, and the essential oil slow release carrier for the humidifier is prepared after shaping, wherein the SEM attached figure is shown as figure 6.

The HDPE material after treatment forms a uniform cell structure, and the size of the cells is uniform and is between 1 and 5 mu m. The porosity measured by a porosity, water absorption and density tester of the porous product is 30.8 percent

The carrier was applied to an aerosolizing humidifier as described in example 1, and the results are shown in fig. 7. As can be seen from the figure, after the carrier with the adsorbed essential oil is added into the humidifier, the content of the essential oil in the carrier begins to be reduced after the humidifier works for 47 hours, and the content of the essential oil in the carrier can still be kept at 93% of the initial content after 72 hours.

And after the carrier does not smell the fragrance of the essential oil, adsorbing the essential oil fully and using the essential oil in a humidifier for recycling the carrier. After the humidifier is used repeatedly for 12 times and 15 times, the concentration change of the essential oil is basically unchanged from the original concentration change after the humidifier is operated for 47 hours and 72 hours. Meanwhile, the problem of essential oil adsorption does not occur on the inner wall of the humidifier container, the atomizing sheet and the outlet.

Comparative example 1

A preparation method of a porous essential oil slow-release carrier comprises the following steps:

based on the total mass percentage content of the PS resin, the PS resin (the melt index is 2.6g/10min) and 10 percent of propane are mixed, and then 1 percent of magnesium oxide particles, 2 percent of dicumyl peroxide and 1.5 percent of antioxidant 264 are put into the resin matrix and are blended in a high-speed mixer. And adding the uniformly mixed materials into a mold cavity, heating to 230 ℃, and keeping the temperature for 2 min. Shaping, and making into essential oil sustained release carrier for humidifier, wherein SEM figure is shown in FIG. 8. The processed PS material forms a cellular structure, the size of the cellular is 10-30 mu m, and the porosity measured by a porosity, water absorption and density tester of the porous product is 21.5%.

The carrier was applied to an aerosolizing humidifier as described in example 1, and the results are shown in fig. 9. As can be seen from the figure, after the carrier with the adsorbed essential oil is added into the humidifier, the content of the essential oil in the carrier is reduced after the humidifier works for 22 hours, and the content of the essential oil in the carrier reaches about 59% of the initial content after 72 hours.

And after the carrier does not smell the fragrance of the essential oil, adsorbing the essential oil fully and using the essential oil in a humidifier for recycling the carrier. After repeating the above steps for 4 times, the atomizer is affected and is difficult to use normally.

Comparative example 2

A preparation method of a porous essential oil slow-release carrier comprises the following steps:

based on the total mass percentage content of the PET resin, firstly mixing the PET resin (the melt index is 1.2g/10min) with 10% of water, then putting 1% of silicon dioxide particles, 2% of dicumyl peroxide and 1.5% of antioxidant 1010 into the resin matrix, and placing the mixture into a high-speed mixer for blending. And adding the uniformly mixed materials into a mold cavity, heating to 230 ℃, and keeping the temperature for 2 min. Water is vaporized at high temperature to form water vapor which is concentrated on the surface of the die, and a uniform cell structure is not formed, so that the water vapor is difficult to be used as an adsorption carrier.

It should be understood that the above-mentioned embodiments of the present invention are only examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention, and it will be obvious to those skilled in the art that other variations or modifications may be made on the basis of the above description, and all embodiments may not be exhaustive, and all obvious variations or modifications may be included within the scope of the present invention.