阅读说明：本技术 一种能够减少烟草吸水的雾化剂及其制备方法和应用 (Atomizing agent capable of reducing water absorption of tobacco and preparation method and application thereof ) 是由 黄龙 张璟 操吉学 刘磊 庞登红 吴峤 于 2021-09-06 设计创作，主要内容包括：本发明涉及加热不燃烧卷烟技术领域,尤其涉及一种能够减少烟草吸水的雾化剂及其制备方法和应用。这种雾化剂包括尿素、植物油以及甘油。其制备方法包括以下步骤：以植物油包覆甘油,得到包覆体；以尿素包覆所述包覆体,得到雾化剂。本发明中,采用植物油代替丙二醇和一部分甘油作为雾化剂,植物油具有明显的疏水特性,雾化剂中使用植物油包覆甘油后,能有效降低雾化剂的吸水性能,便于烟草原料的储存和包装。同时通过尿素尿包工艺包覆植物油和甘油,帮助植物油和甘油在烟草原料中的渗透和扩散,提高烟草原料对雾化剂的负载量。(The invention relates to the technical field of heating non-combustion cigarettes, in particular to an atomizing agent capable of reducing water absorption of tobacco and a preparation method and application thereof. Such nebulisers include urea, vegetable oils and glycerol. The preparation method comprises the following steps: coating glycerol with vegetable oil to obtain a coating body; and coating the coating body with urea to obtain the atomizing agent. According to the invention, the vegetable oil is adopted to replace propylene glycol and a part of glycerin as the atomizing agent, the vegetable oil has an obvious hydrophobic characteristic, and after the glycerin is coated by the vegetable oil in the atomizing agent, the water absorption performance of the atomizing agent can be effectively reduced, so that the storage and the packaging of the tobacco raw materials are facilitated. Meanwhile, the urea bag process is used for coating the vegetable oil and the glycerin, so that the vegetable oil and the glycerin are helped to permeate and diffuse in the tobacco raw material, and the loading capacity of the tobacco raw material to the atomizing agent is improved.)

1. An atomizing agent capable of reducing water absorption of tobacco, characterized in that: including urea, vegetable oils, and glycerin.

2. A nebulant for reducing the water uptake of tobacco as claimed in claim 1 wherein: also comprises perfume.

3. A nebulant for reducing the water uptake of tobacco as claimed in claim 1 wherein: also comprises oil-soluble nano titanium dioxide.

4. A nebulant for reducing the water uptake of tobacco as claimed in claim 1 wherein: the vegetable oil comprises one or more of olive oil, corn oil, peanut oil, linseed oil, coconut oil, oil palm seed oil, babassu seed oil, soybean oil, castor oil, rapeseed oil, cottonseed oil, rice bran oil, sunflower seed oil and sesame oil.

5. A method of preparing a nebulant according to any one of claims 1 to 4 which is capable of reducing the uptake of water by tobacco, characterised in that: the method comprises the following steps: A. coating glycerol with vegetable oil to obtain a coating body; B. and coating the coating body with urea to obtain the atomizing agent.

6. A method of preparing a nebulant for reducing the water absorption of tobacco as claimed in claim 5, wherein: in the step A, the glycerin is coated by the spice and the vegetable oil together to obtain a coating body.

7. A method of preparing a nebulant for reducing the water absorption of tobacco as claimed in claim 5, wherein: in the step A, a mixed system of oil-soluble nano titanium dioxide and vegetable oil is used for coating glycerol together to obtain a coating body.

8. A method of preparing a nebulant for reducing the water absorption of tobacco as claimed in claim 5, wherein: the step A comprises the following steps: mixing and dispersing the vegetable oil and the silica silylate at the rotating speed of 1000-1500r/min to obtain a mixed system; then adding glycerol into the mixed system at the rotating speed of 300-600 r/min; after the glycerol is added, the rotating speed is increased to 1000-.

9. A method of preparing a nebulant for reducing the water absorption of tobacco as claimed in claim 5, wherein: the step B comprises the following steps: adding the coating into a saturated solution of urea, stirring uniformly, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and under the temperature environment lower than the crystallization temperature of urea, the crystal is crushed to 300-mesh and 500-mesh to obtain the atomizing agent.

10. Use of a nebulant according to any one of claims 1 to 4 for reducing tobacco water uptake in heated cigarettes, wherein: spraying an atomizing agent on the tobacco raw material, wherein the mixing mass ratio of the atomizing agent to the tobacco raw material is (0.1-0.5): 100.

Technical Field

The invention relates to the technical field of heating non-combustion cigarettes, in particular to an atomizing agent capable of reducing water absorption of tobacco and a preparation method and application thereof.

Background

Heating cigarettes (HTPs), also known as non-burning cigarettes or low temperature cigarettes, is a new strategic development direction in the tobacco industry at present. The tobacco substance is heated by an external heat source, and the atomized medium, the flavor components and the additional flavor in the tobacco substance generate smoke similar to the smoke of the traditional cigarette through heating, so that the consumers can obtain physiological satisfaction. The tobacco substances in the heated cigarette are only heated but not combusted, so that the harmful components and the biotoxicity of the smoke are greatly reduced, and the side-stream smoke and the environmental smoke are also greatly reduced, thereby being more beneficial to the health of consumers.

In order to produce a strong smoke similar to that of conventional cigarettes during the heating process of HTPs, the prior art often requires the addition of a large amount of a nebulizing agent such as glycerin and 1, 2-propanediol to the tobacco material of HTPs. Glycerol and 1, 2-propylene glycol are common additives in traditional cigarettes, and are mainly used as solvents and flavor fixatives for flavors and fragrances in traditional cigarettes, and the dosage of glycerol and 1, 2-propylene glycol is generally several thousandth of the mass of tobacco substances (mass fraction). In the heated cigarette, the glycerol and the 1, 2-propylene glycol are used as the atomizing agent, and the dosage of the glycerol and the 1, 2-propylene glycol is as high as 20-30% (mass fraction) or even more than 40% of the mass of the tobacco substances, so that the dosage of the glycerol and the 1, 2-propylene glycol in the heated cigarette is two orders of magnitude higher or even higher than that of the traditional cigarette.

However, glycerin and propylene glycol, when used as a nebulant, have the following problems: 1. glycerin and propylene glycol both have strong water absorption, and moisture has obvious influence on the sensory quality of the heated cigarette. In the process of the invention, the inventor finds that the tobacco material and the cigarette of the heated cigarette can continuously absorb water no matter under the environment conditions of high temperature, low temperature, high humidity and low humidity, only the water absorption rate is different, and the water absorption is slower in the low humidity environment. However, moisture in natural environment is ubiquitous, so on one hand, high requirements are put on the processing and production environment of the heated cigarette, and the processing and production environment needs to be carried out in a low-humidity environment so as to absorb moisture as little as possible; on the other hand, the production and the manufacture are difficult, the tobacco material applied with the atomizing agents such as glycerin, propylene glycol and the like is soft, and tobacco substances are agglomerated and difficult to roll up in the cigarette rolling and connecting process after water absorption; on the other hand, the quality control is difficult, and the tobacco materials and cigarettes continuously absorb moisture, so that the moisture of the heated cigarettes produced and manufactured in different seasons, different climates, different batches, different teams and different machines is difficult to control consistently, and the quality fluctuation is caused; on the other hand, higher requirements are provided for storage and transportation, the tobacco material for heating the cigarettes and the storage and transportation of the cigarettes need to reduce the exposure time in the environment, and a lower humidity environment is needed; on the other hand, the quality guarantee time of the heated cigarette is shortened, and the tobacco material and the cigarette continuously absorb moisture to cause the moisture to continuously rise and easily deteriorate, so that the quality guarantee time of the heated cigarette is shortened; on the last hand, the consumption experience of consumers is influenced, and after the cigarettes are heated and unpacked, the cigarettes which are drawn at the beginning are different from the cigarettes which are drawn at the last, and the sensory quality is different. Therefore, the method has important significance for reducing the water absorption performance of the heated cigarette. The patent document with the publication number of CN102783708A discloses a vegetable oil tobacco humectant and a preparation method thereof, wherein the vegetable oil tobacco humectant comprises the following components in percentage by mass: 10-40% of vegetable oil, 1.2-6% of emulsifier and 54-88% of water; the emulsifier is food-grade nonionic surfactant or natural emulsifier. The vegetable oil forms a closed barrier on the surface of the tobacco raw material to achieve the effects of moisture retention and moisture resistance (namely water absorption resistance), and the vegetable oil only needs to form a film on the surface of the tobacco raw material and does not need to permeate into the tobacco raw material. The atomizing agent used in the cigarette which is not burnt is different from the humectant, and needs to permeate into the interior of the tobacco raw material so as to ensure the uniformity and the durability of subsequent atomization. However, the vegetable oils of this application just cause the problem of difficult penetration of the humectant into the interior of the tobacco material. 2. The glycerin has a certain sweet taste, and when a large amount of glycerin is used as a fogging agent, uncomfortable symptoms such as dry throat, irritation, sweet and greasy feeling and the like are often caused when a consumer sucks and heats cigarettes. 3. The taste of propylene glycol is not suitable for some consumers, and the substitute thereof is hopefully to be found and compounded with glycerol.

Disclosure of Invention

The invention aims to solve the problems and provides an atomizing agent capable of reducing water absorption of tobacco and a preparation method and application thereof.

The technical scheme for solving the problem is to provide an atomizing agent capable of reducing water absorption of tobacco, which comprises urea, vegetable oil and glycerol.

Preferably, the vegetable oil includes one or more of olive oil, corn oil, peanut oil, linseed oil, coconut oil, oil palm seed oil, babassu seed oil, soybean oil, castor oil, rapeseed oil, cottonseed oil, rice bran oil, sunflower seed oil and sesame oil.

The vegetable oil has obvious hydrophobic property, and after the vegetable oil is used in the atomizing agent, the water absorption performance of the atomizing agent can be effectively reduced; meanwhile, after the atomizing agent is added into the tobacco substance and is permeated and balanced for a period of time, the oil film-shaped protection can be formed on the surface of the tobacco substance, and the moisture absorption of the tobacco substance is prevented or reduced to a certain extent.

However, the vegetable oil can also cause difficulty in penetration of the atomizing agent into the tobacco material, and therefore, urea is also added in the tobacco material. The crystals of urea are tetragonal, and when the crystals coexist with the straight-chain fatty acids in the vegetable oil, the crystals become hexahedral crystals, and the straight-chain saturated fatty acids most easily enter the pipelines of the hexahedral crystals to form urea inclusion compounds. And the urea is an important fertilizer in the plant growth process, and the plants have considerable absorptivity to the urea. This application passes through urea parcel vegetable oil, can help the vegetable oil infiltration to enter into tobacco material inside, urea can progressively decompose into ammonia and carbon dioxide and detach through the heating simultaneously, leaves the vegetable oil and realizes the anti effect of absorbing water.

The urea may be partially removed by heating the tobacco material after it is added with the aerosol, or may be removed again during the smoking heating process.

However, since unpleasant ammonia smell is generated in the thermal decomposition process of urea, it is preferable to further include a perfume. As a preferable choice of the invention, the spice is a mixture of dextro-decyl propyl ester and ethyl cinnamate. The dextro-decyl propyl ester with sweet milk fragrance and the ethyl cinnamate with good odor volatilization are compounded, so that the odor of the volatilized ammonia gas can be covered. When the ratio of the dextro-decyl propyl ester to the ethyl cinnamate is 3:2, the synergistic masking effect is obvious.

Or/and as the optimization of the invention, nano titanium dioxide is also included. The nanometer titanium dioxide is the most common photo-catalytic ammonia gas oxidation catalyst, can convert ammonia gas into nitrogen gas, nitrous oxide and the like without taste, and avoids the peculiar smell of tobacco. Meanwhile, the titanium dioxide has good heat-conducting property, is applied to heating of non-combustible cigarettes, can improve the heating smoking speed of the heating of the non-combustible cigarettes, and improves smoking experience.

In order to facilitate the mixing with vegetable oil, the oil-soluble nano titanium dioxide is preferably selected.

Another object of the present invention is to provide a method for preparing a tobacco smoke reducing aerosol, comprising the steps of: A. coating glycerol with vegetable oil to obtain a coating body; B. and coating the coating body with urea to obtain the atomizing agent.

In the application, a urea-vegetable oil-glycerin coating structure is adopted, and glycerin can be prevented from absorbing water by coating the glycerin with vegetable oil; the urea is used for coating the vegetable oil, so that the coating body of the vegetable oil coated with the glycerol can be helped to permeate into the tobacco raw material, and the permeability of the atomizing agent permeating into the tobacco raw material is improved.

Preferably, in step a, glycerin is coated with a perfume and a vegetable oil together to obtain a coated body.

Preferably, in the step a, glycerin is coated by a mixed system of oil-soluble nano titanium dioxide and vegetable oil together to obtain a coating body.

Preferably, step a comprises the steps of: mixing and dispersing the vegetable oil and the silica silylate at the rotating speed of 1000-1500r/min to obtain a mixed system; then adding glycerol into the mixed system at the rotating speed of 300-600 r/min; after the glycerol is added, the rotating speed is increased to 1000-.

Preferably, step B comprises the steps of: adding the coating into a saturated solution of urea, stirring uniformly, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and under the temperature environment lower than the crystallization temperature of urea, the crystal is crushed to 300-mesh and 500-mesh to obtain the atomizing agent.

It is a further object of the present invention to provide a use of an atomizing agent capable of reducing water absorption of tobacco in heating cigarettes, wherein the atomizing agent is sprayed onto tobacco raw material, and the mixing mass ratio of the atomizing agent to the tobacco raw material is (0.1-0.5): 100.

preferably, a venturi ejector is used in the present invention.

Preferably, the tobacco raw material comprises one or more of cut tobacco, thin slice, cut stem, expanded cut tobacco and tobacco particles.

Preferably, the tobacco material is subjected to expansion, or/and baking, or/and steam explosion treatment prior to spraying the atomizing agent.

The invention has the beneficial effects that:

1. according to the invention, the vegetable oil is adopted to replace propylene glycol and a part of glycerin as the atomizing agent, the vegetable oil has an obvious hydrophobic characteristic, and after the glycerin is coated by the vegetable oil in the atomizing agent, the water absorption performance of the atomizing agent can be effectively reduced, so that the storage and the packaging of the tobacco raw materials are facilitated. In addition, because the vegetable oil molecular structure has hydrophobic long-chain alkyl, the boiling point of the long-chain alkyl is lower than that of glycerin, the hydrogen bond interaction between the vegetable oil molecules is greatly reduced compared with that of the glycerin, and the azeotrope formed by the glycerin and the vegetable oil is favorable for reducing the atomization temperature, so that the atomization efficiency can be improved, the temperature of the mainstream smoke of the heated cigarette can be reduced, and the burning sense and the mouth burning accident during smoking can be avoided. Meanwhile, because the vegetable oil without sweetness and sweet greasy feeling replaces a part of glycerin with high sweetness and sweet greasy feeling, the sweetness and greasy feeling of the composite atomizing agent of the vegetable oil and the glycerin is greatly reduced compared with that of a pure glycerin atomizing agent.

2. According to the invention, the vegetable oil and the glycerin are coated by the urea bag process, so that the penetration and diffusion of the vegetable oil and the glycerin in the tobacco raw material are facilitated, and the loading capacity of the tobacco raw material to the atomizing agent is improved.

Drawings

FIG. 1 is a scanning electron micrograph of a tobacco sheet obtained in example 1.

Fig. 2 is a scanning electron micrograph of the tobacco sheet produced in comparative example 1.

Detailed Description

The following are specific embodiments of the present invention and further describe the technical solutions of the present invention, but the present invention is not limited to these examples.

Example 1

An aerosol capable of reducing tobacco water uptake, prepared by the steps of:

according to parts by mass, 5 parts of urea, 50 parts of olive oil, 30 parts of glycerin, and 0.5 part of silica silylate were prepared.

A. Mixing and dispersing olive oil and silica silylate at the rotating speed of 1300r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 450 r/min; after the glycerol is added, the rotating speed is increased to 1300r/min, and the mixture is homogenized for 4min, so that the coating body is obtained.

B. Adding the coating into a saturated solution of urea, stirring uniformly, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and (3) crushing the crystals to 400 meshes at the temperature of 10 ℃ to obtain the atomizing agent.

Spraying 0.015g of atomizing agent onto a tobacco sheet prepared by a 5g papermaking method by adopting a Venturi ejector, wherein the mixing mass ratio of the atomizing agent to the tobacco sheet is 0.3: 100.

scanning the tobacco sheets by an electron microscope: a Philips XL30 scanning electron microscope is adopted, and the main parameters are as follows: acceleration voltage 20.0KV, beam spot diameter 4.0MM, magnification factor 250, working distance 4.6MM, probe type SE. As shown in a scanning electron microscope image of fig. 1, it can be clearly seen that the tobacco sheet added with the atomizing agent of the present application has a smooth surface, shallow wrinkles and a film-forming feeling. The vegetable oil forms a kind of oil film protection on the surface of the sheet, so that the moisture absorption of the tobacco material can be prevented or reduced to a certain extent.

Example 2

This embodiment is substantially the same as embodiment 1, except that:

in this embodiment, the paint further comprises 1.5 parts of dextro-decyl propyl ester and 1 part of ethyl cinnamate.

In the step A, olive oil, dextro-decyl propyl ester, ethyl cinnamate and silica silylate are mixed and dispersed at the rotating speed of 1300r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 450 r/min; after the glycerol is added, the rotating speed is increased to 1300r/min, and the mixture is homogenized for 4min, so that the coating body is obtained.

Example 3

This embodiment is substantially the same as embodiment 1, except that:

in this embodiment, the paint further includes 3 parts of oil-soluble nano titanium dioxide.

The oil-soluble nano titanium dioxide is prepared by the following steps:

sequentially dissolving n-octylamine and tetrabutyl orthotitanate into a cyclohexane solvent to ensure that the concentration of tetrabutyl orthotitanate reaches 0.25mol/L and the concentration of n-octylamine reaches 0.15 mol/L, and magnetically and rapidly stirring to obtain an oil phase system; deionized water is taken, and the pH value is adjusted to 11 by sodium hydroxide and perchloric acid to obtain a water phase system. Placing 20mL of the water phase system in the lower layer of a hydrothermal reaction kettle, placing 20mL of the oil phase system in the upper layer of the hydrothermal reaction kettle, sealing the reaction kettle, placing the reaction kettle in a forced air drying oven, adjusting the temperature to 140 ℃, aging for 48 hours, then closing the drying oven, and naturally cooling the reaction kettle to room temperature. After the reaction is finished, separating the mixture in the reaction kettle by using a separating funnel, taking the upper oil phase, adding a certain amount of ethanol for washing, centrifuging, repeatedly washing for three times, and drying the centrifuged product at 60 ℃ for 24 hours to obtain the oil-soluble nano titanium dioxide.

In the step A, mixing and dispersing olive oil, oil-soluble nano titanium dioxide and silica silylate at the rotating speed of 1300r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 450 r/min; after the glycerol is added, the rotating speed is increased to 1300r/min, and the mixture is homogenized for 4min, so that the coating body is obtained.

Example 4

This embodiment is substantially the same as embodiment 1, except that:

in this example, the paint also includes 1.5 parts of dextro-decyl propyl ester, 1 part of ethyl cinnamate, and 3 parts of the oil-soluble nano titanium dioxide prepared in example 3.

In the step A, under the rotating speed of 1300r/min, olive oil, dextro-decyl propyl ester, ethyl cinnamate, oil-soluble nano titanium dioxide and silica silylate are mixed and dispersed to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 450 r/min; after the glycerol is added, the rotating speed is increased to 1300r/min, and the mixture is homogenized for 4min, so that the coating body is obtained.

Example 5

An aerosol capable of reducing tobacco water uptake, prepared by the steps of:

according to parts by mass, 5 parts of urea, 40 parts of corn oil, 40 parts of glycerin, 0.1 part of silica silylate, 1 part of dextro-decylpropyl ester, 1 part of ethyl cinnamate, and 3.5 parts of the oil-soluble nano titanium dioxide prepared in example 3 were prepared.

A. Mixing and dispersing corn oil, dextro-decyl propyl ester, ethyl cinnamate, oil-soluble nano titanium dioxide and silica silylate at the rotating speed of 1000r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 300 r/min; after the glycerol is added, the rotating speed is increased to 1000r/min, and the mixture is homogenized for 5min, so that the coating body is obtained.

B. Adding the coating into a saturated solution of urea, stirring uniformly, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and (3) crushing the crystals to 500 meshes at the temperature of 5 ℃ to obtain the atomizing agent.

Puffing tobacco shreds: shredding tobaccoPlacing into a pressure vessel, pressurizing the interior of the pressure vessel with gaseous carbon dioxide to a gauge pressure of at least about 4.3kg/cm²Supplying liquid carbon dioxide from above the tobacco shreds while maintaining the impregnation pressure, saturating carbon dioxide gas in the pressure container by evaporation of the liquid carbon dioxide, holding for 10s, and then reducing the pressure in the pressure container to substantially atmospheric pressure, and taking out the tobacco shreds from the pressure container; the removed tobacco shreds are fed to a pneumatic dryer where they are expanded by contacting them with a stream of air at elevated temperature.

Spraying 0.005g of the atomizing agent onto 5g of the puffed tobacco filaments by adopting a Venturi ejector, wherein the mixing mass ratio of the atomizing agent to the tobacco filaments is 0.1: 100.

example 6

An aerosol capable of reducing tobacco water uptake, prepared by the steps of:

according to parts by mass, 5 parts of urea, 60 parts of soybean oil, 20 parts of glycerin, 0.3 part of silica silylate, 2.5 parts of ethyl cinnamate, and 3 parts of the oil-soluble nano titanium dioxide obtained in example 3 were prepared.

A. Mixing and dispersing soybean oil, dextro-decyl propyl ester, ethyl cinnamate, oil-soluble nano titanium dioxide and silica silylate at the rotating speed of 1500r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 600 r/min; after the glycerol is added, the rotating speed is increased to 1500r/min, and the mixture is homogenized for 3min, so that the coating body is obtained.

B. Adding the coating into a saturated solution of urea, stirring uniformly, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and (3) crushing the crystals to 300 meshes at the temperature of 0 ℃ to obtain the atomizing agent.

Spraying 0.025g of atomizing agent onto a tobacco sheet prepared by a paper making method by adopting a Venturi ejector, wherein the mixing mass ratio of the atomizing agent to the tobacco sheet is 0.5: 100. placing the tobacco sheet in a hot air drying oven, and hot air drying at 160 deg.C for 10 min.

Comparative example 1

Heating 0.015g of glycerin to 50 ℃ to reduce the viscosity of the glycerin, and spraying the glycerin onto 5g of tobacco sheets prepared by a papermaking method, wherein the mixing mass ratio of the glycerin to the tobacco raw materials is 0.3: 100.

scanning the tobacco sheets by an electron microscope: a Philips XL30 scanning electron microscope is adopted, and the main parameters are as follows: acceleration voltage 20.0KV, beam spot diameter 4.0MM, magnification factor 250, working distance 4.6MM, probe type SE. As shown in FIG. 2, the surface of the tobacco sheet was much wrinkled and rough as seen by scanning electron microscopy.

Comparative example 2

According to parts by mass, 5 parts of urea, 50 parts of olive oil and 30 parts of glycerin are prepared.

Directly mixing urea, olive oil and glycerol to obtain the atomizing agent.

Then 0.015g of the atomizing agent is sprayed on a tobacco sheet prepared by a 5g papermaking method, and the mixing mass ratio of the atomizing agent to the tobacco raw material is 0.3: 100.

comparative example 3

55 parts by mass of olive oil and 30 parts by mass of glycerin were prepared.

Mixing and dispersing olive oil and silica silylate at the rotating speed of 1300r/min to obtain a mixed system; then slowly adding glycerol into the mixed system at the rotating speed of 450 r/min; after the glycerol is added, the rotating speed is increased to 1300r/min, and the mixture is homogenized for 4min, so that the atomizing agent is obtained.

Then 0.015g of the atomizing agent is sprayed on a tobacco sheet prepared by a 5g papermaking method, and the mixing mass ratio of the atomizing agent to the tobacco raw material is 0.3: 100.

comparative example 4

According to parts by mass, 5 parts of urea, 50 parts of olive oil and 30 parts of glycerin are prepared.

Mixing olive oil and glycerin to obtain a mixture.

Adding the mixture into a saturated solution of urea, uniformly stirring, and naturally cooling to obtain urea crystals; filtering to remove filtrate to obtain crystal; and (3) crushing the crystals to 400 meshes at the temperature of 10 ℃ to obtain the atomizing agent.

Spraying 0.015g of atomizing agent onto a tobacco sheet prepared by a 5g papermaking method by adopting a Venturi ejector, wherein the mixing mass ratio of the atomizing agent to the tobacco sheet is 0.3: 100.

[ anti-Water-absorption assay ]

Taking 10 weighing bottles with diameters of 50mm and heights of 50mm and covers, accurately weighing the weights of the weighing bottles respectively, and recording as M₀. The mass of the sheets or tobacco threads in examples 1 to 6 and comparative examples 1 to 4 was measured and recorded as M₁. Respectively placing 11 parts of tobacco raw materials into weighing bottles, opening weighing bottle caps, and placing the bottles in a constant temperature and humidity box (the temperature is 22 +/-0.5 ℃, and the relative humidity is 60 +/-1 percent) for balancing.

And timing when the sample enters the constant temperature and humidity chamber from the beginning of placement. Covering the bottle cap at regular intervals T, taking out the weighing bottle, weighing, and recording the mass as M₂. The change in sheet moisture after the equilibration time T is: (M)₂ -M₀）/ M₁X 100%. The results of the measurement calculation are shown in table 1 below.

Table 1.

As can be seen from Table 1, the water absorption of the tobacco material is nearly saturated after the equilibrium time is 2000min or more. The tobacco materials of examples 1-6 had lower water absorption at each equilibrium time than comparative example 1, indicating that urea and vegetable oil were used in place of a portion of the glycerin to reduce the water absorption of the tobacco material. Meanwhile, the water absorption rates of examples 1 to 6 were also lower than those of comparative examples 2 and 4, which demonstrates that the water absorption rate of the tobacco raw material can be further reduced by coating glycerin with vegetable oil, compared to a technique of simply mixing vegetable oil and glycerin directly. In comparative example 3, since urea was not added and glycerin was coated with vegetable oil, the water absorption rate was lower than that of the example, but it was found that the aerosol permeability of comparative example 3 was not good in the subsequent aerosol permeability test.

[ detection of the permeability of nebulant ]

The sheets or tobacco threads to which the atomizing agent was just applied in examples 1 to 6 and comparative examples 1 to 4 were respectively left standing in a vacuum atmosphere for 2 hours and then taken out, and the mass thereof was measured. According to the formula: (post-resting mass-mass of tobacco material before no aerosol was applied)/mass of tobacco material before no aerosol was applied, the measured absorption ratio of the aerosol in the tobacco material was calculated. And simultaneously according to the formula: nebulant absorption = measured absorption/theoretical application ratio, calculated to give the nebulant absorption as shown in table 2 below.

Table 2.

As can be seen from table 2, in comparative example 1, only glycerin was used as the atomizing agent, so the tobacco raw material had a higher rate of absorption of the atomizing agent; in comparative example 2, vegetable oil was used instead of part of the glycerin, resulting in lower tobacco raw material absorption rate for the atomizing agent; in comparative example 3, glycerin was coated with vegetable oil, resulting in further reduction of the absorption rate of the atomizing agent; in comparative example 4, urea is used to wrap the vegetable oil, so that the absorption rate of the tobacco raw material to the atomizing agent can be improved to a certain extent.

[ organoleptic evaluation ]

And (3) respectively manufacturing the tobacco raw materials after balancing for 3000min into tobacco sections, and connecting the tobacco sections with the cooling filter tip through tipping paper to form the heating cigarette. The cigarette is provided for the smoke evaluation of smoke evaluation personnel, and the sensory evaluation is shown in the following table 3.

[ evaluation of atomization ]

Atomization effect: and (4) performing smoking evaluation on the heated cigarette obtained in the above way by using a smoking machine. The smoking machine heats and smokes cigarettes according to a suction capacity of 55 milliliters per mouth, a suction duration of 2 seconds, a suction interval of 30 seconds and a bell-shaped suction curve, sucks 8 mouths totally, independently collects smoke of each mouth in a cylindrical needle cylinder with the volume of 100 milliliters, and measures the absorbance of the smoke after the smoke is diffused for 2 seconds; the nebulising effect of a nebulant is expressed as a percentage of its absorbance to the absorbance of 100% glycerol as nebulant and the absorbance of 100% glycerol as nebulant is set to 100%. The atomization effect values when the third port was aspirated are shown in table 3 below.

Temperature at the completion of atomization: after the atomizing agent is liquefied in an environment with the temperature of more than 40 ℃, 1 drop (about 0.05 g) of the atomizing agent is dripped on the fragrant paper by a dropper, and then the fragrant paper is put into an atomizing pipe. The atomizing pipe is arranged in a heating device which is preheated and has set initial temperature, so that the timing is started after the part of the paper smelling the incense on which the atomizing agent is dripped is positioned in the middle of the heating position, and the smog can be continuously generated at the moment. After 20 seconds, if no new smoke is produced on the scented paper, the initial temperature set at this point is the temperature at which atomization of the aerosol is complete. After 20 seconds, if new smoke is still being generated on the scented paper, the heating temperature is increased by 5 ℃, and the above experiment is continued until the temperature at which atomization of the aerosol is complete is determined. The heating temperature was set in the order from low temperature to high temperature, with a temperature gradient of 5 ℃ each time. The preheating time of the heating appliance is generally 15-20 seconds, and the suction is started after the preheating is finished. Therefore, 20 seconds are selected in the experiment, and if new smoke is not generated on the fragrance-smelling paper after 20 seconds, the fact that the atomizing agent is quickly atomized at the temperature and the atomization can be better and completely realized is shown. The results are shown in Table 3 below.

Table 3.

It can be seen from table 3 that the atomization effect of the atomization agent in the embodiment of the present application is substantially similar to the atomization effect of the pure glycerin in comparative example 1, and the temperature at which the atomization agent is completely atomized can be reduced by adding the vegetable oil, and the addition of the nano titanium dioxide can not only eliminate the pungent odor, but also accelerate the atomization rate to further reduce the temperature at which the atomization is completely atomized.

The specific embodiments described herein are merely illustrative of the spirit of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.