阅读说明：本技术 一种六铝酸盐基红外加热薄膜及其制备方法和应用 (Hexaaluminate-based infrared heating film and preparation method and application thereof ) 是由 刘华臣 唐良颖 黄婷 谭健 吴聪 于 2021-09-06 设计创作，主要内容包括：本发明属于烟草红外加热领域,具体涉及一种六铝酸盐基红外加热薄膜及其制备方法和应用。该红外加热薄膜由包含六铝酸盐、胶凝材料的涂覆液固化而成；其中,所述六铝酸盐的分子式为ABAl-(11)O-(19),其中A为碱土金属或稀土金属中的一种或多种,B为Cr,Mn,Fe,Co,Ni,Cu,Zn中的一种或多种。该红外加热薄膜采用六铝酸盐与胶凝材料和水混合后在室温下涂敷于加热体表面直接成膜,成型温度低,制备工艺简单；且制备得到的六铝酸盐基红外加热薄膜在1-25μm波段的红外发射率在0.926-0.972之间,发射率高、加热速度快；将该红外加热薄膜应用于加热不燃烧烟草加热器具,从而对烟草进行加热。(The invention belongs to the field of infrared heating of tobacco, and particularly relates to a hexaaluminate-based infrared heating film and a preparation method and application thereof. The infrared heating film is formed by curing coating liquid containing hexaaluminate and a cementing material; wherein the molecular formula of the hexaaluminate is ABAl 11 O 19 Wherein A is one or more of alkaline earth metal or rare earth metal, and B is one or more of Cr, Mn, Fe, Co, Ni, Cu and Zn. The infrared heating film is prepared by mixing hexaaluminate, a cementing material and water and then coating the mixture on the surface of a heating body at room temperature to directly form a film, the forming temperature is low, and the preparation process is simple; the infrared emissivity of the prepared hexaaluminate-based infrared heating film in a wave band of 1-25 mu m is 0.926-0.972, the emissivity is high, and the heating speed is high; applying the infrared heating film toThe tobacco heating device is not burned when heated, thereby heating the tobacco.)

1. The hexaaluminate-based infrared heating film is characterized by being formed by curing coating liquid containing hexaaluminate and a cementing material;

wherein the molecular formula of the hexaaluminate is ABAl₁₁O₁₉Wherein A is one or more of alkaline earth metal or rare earth metal, and B is one or more of Cr, Mn, Fe, Co, Ni, Cu and Zn.

2. The hexaaluminate-based infrared heating film as set forth in claim 1, wherein the gelling material is one or more of portland cement, aluminate cement, magnesium-based gelling material and water glass.

3. The method of claim 1, comprising the steps of:

s1: weighing oxide corresponding to alkaline earth metal or rare earth metal and one or more corresponding oxides of Cr, Mn, Fe, Co, Ni, Cu and Zn, and calcining;

s2: grinding and screening the calcined powder obtained in the step S1 to obtain hexaaluminate;

s3: mixing the hexaaluminate obtained in the step S2, a cementing material and water to form a colloidal substance;

s4: the colloidal substance obtained in step S3 was applied to the surface of the heating element to obtain a hexaaluminate-based infrared heating film.

4. The method of claim 3, wherein the purity of the oxide obtained in step S1 is 99-100%.

5. The method as claimed in claim 3, wherein the calcination temperature in step S1 is 700-1000 ℃ and the calcination time is 1-5 h.

6. The method as claimed in claim 3, wherein the particle size of the hexaaluminate in step S3 is 500-1000 mesh.

7. The method for preparing hexaaluminate-based infrared heating film according to claim 3, wherein the mass ratio of hexaaluminate, the gelling material and water is (7-8): 1: (1-2).

8. Use of a hexaaluminate-based infrared heating film according to claim 1 in heating a non-combustible tobacco heating appliance.

Technical Field

The invention belongs to the field of infrared heating of tobacco, and particularly relates to a hexaaluminate-based infrared heating film and a preparation method and application thereof.

Background

Heating non-combustible tobacco products is one of the trends in the development of new types of tobacco. Traditional heating does not burn cigarette adopts heating element to insert the inside cigarette that does not burn of heating to heat the cigarette of not burning usually, and heating element is the resistance heating body usually, but the thermal conductivity of conventional heating body is low, and during the heating tobacco, there is great temperature gradient in tobacco and heating body contact part and other positions, leads to heating inhomogeneous, heating efficiency low.

Infrared radiation heating does not need a transfer medium, has high heat transfer efficiency, and can penetrate the surface of a heated body to a certain extent to realize simultaneous heating inside and outside the substance. However, the conventional infrared heating coating has high forming temperature, complex preparation process and low emissivity of the infrared response wave band of the tobacco, and limits the application of the infrared heating film.

Disclosure of Invention

In order to overcome the defects of the prior art, the invention aims to provide a hexaaluminate-based infrared heating film and a preparation method and application thereof. The infrared heating film has low forming temperature and high emissivity in the infrared response wave band range, and can be applied to heating appliances for heating incombustible tobacco so as to heat tobacco.

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

a hexaaluminate-based infrared heating film is formed by curing a coating liquid containing hexaaluminate and a cementing material;

wherein the molecular formula of the hexaaluminate is ABAl₁₁O₁₉Wherein A is one or more of alkaline earth metal or rare earth metal, and B is one or more of Cr, Mn, Fe, Co, Ni, Cu and Zn.

The invention has the following excellent technical scheme: the cementing material is one or more of portland cement, aluminate cement, magnesium cementing material and water glass.

The invention also provides a preparation method of the hexaaluminate-based infrared heating film, which comprises the following steps:

s1: weighing and calcining the alkaline earth metal or the rare earth metal and the oxide corresponding to the metal element;

s2: grinding and screening the calcined powder obtained in the step S1 to obtain hexaaluminate;

s3: mixing the hexaaluminate obtained in the step S2, a cementing material and water to form a colloidal substance;

s4: the colloidal substance obtained in step S3 was applied to the surface of the heating element to obtain a hexaaluminate-based infrared heating film.

The invention has the following excellent technical scheme: the purity of the oxide obtained in the step S1 is 99% -100%.

The invention has the following excellent technical scheme: the calcination temperature in the step S1 is 700-1000 ℃, and the calcination time is 1-5 h.

The invention has the following excellent technical scheme: the granularity of the hexaaluminate in the step S3 is 500-1000 meshes.

The invention has the following excellent technical scheme: the mass ratio of the hexaaluminate to the cementing material to the water is (7-8): 1: (1-2).

It is still another object of the present invention to provide a use of a hexaaluminate-based infrared heating film in a heating appliance for heating incombustible tobacco.

Compared with the prior art, the invention has the following beneficial effects:

the hexaaluminate is mixed with the gelled material and water and then coated on the surface of the heating body at room temperature to directly form a film, the forming temperature is low, and the preparation process is simple; the infrared emissivity of the prepared hexaaluminate-based infrared heating film in a wave band of 1-25 mu m is 0.926-0.972, the emissivity is high, and the heating speed is high; the infrared heating film is applied to a heating appliance for heating non-combustion tobacco, thereby heating the tobacco.

Detailed Description

The present invention will be described in further detail with reference to preferred embodiments, which are not intended to limit the scope of the present invention.

In the present application, the hexaaluminate contains alkaline earth metals or rare earth metals, and metal elements such as Cr, Mn, Fe, Co, Ni, Cu, Zn, etc., that is, any one or any combination of alkaline earth metals or rare earth metals, and any one or any combination of metal elements such as Cr, Mn, Fe, Co, Ni, Cu, Zn, etc., but is not limited thereto. In a preferred embodiment, the metals used to prepare the hexaaluminates all have an oxide purity greater than 99%. The particle size of hexaaluminate should be larger than 500 meshes, and the preferred particle size of the hexaaluminate is 500 meshes and 1000 meshes.

In a further aspect, the present application also provides the use of the hexaaluminate-based infrared heating film described above in the manufacture of a heater for heating a non-combustible smoking article.

In the implementation of the above use, the hexaaluminate-based infrared heating film can be applied to the surface of an electric heater, and the heater for heating a non-combustible tobacco product manufactured by the method can rapidly and uniformly heat tobacco, thereby improving the satisfaction of users.

Example 1

Preparation of a hexaaluminate-based infrared heating film:

(1) weighing La according to proportion₂O₃，CaO，Fe₂O₃，Al₂O₃The molar ratio is 1: 4: 2: 22. the weighed La is added₂O₃，CaO，Fe₂O₃，Al₂O₃The mixture was uniformly mixed in a ball mill and then calcined at 800 ℃ for 2 hours.

(2) Ball-milling the calcined powder and then screening to obtain hexaaluminate powder with the molecular formula of La_0.5CaFeA_l1O₁₉。

(3) Taking hexaaluminate powder with the granularity of 500 meshes, and mixing the hexaaluminate powder with a cementing material and water according to the mass ratio of 8: 1: 1.5 to form a gelatinous material.

(4) And (3) coating the colloidal substance on the surface of the electric heating element at room temperature, and standing for 2 hours to obtain the hexaaluminate infrared heating film.

Through tests, the infrared emissivity of the infrared heating film obtained in the embodiment in a wave band of 1-25 μm is 0.933.

Example 2

Preparation of a hexaaluminate-based infrared heating film:

(1) weighing La according to proportion₂O₃、Y₂O₃、NiO、Fe₂O₃And Al₂O₃The molar ratio is 1: 1: 1: 1.5: 44. the weighed La is added₂O₃、Y₂O₃、NiO、Fe₂O₃And Al₂O₃After mixing uniformly in a ball mill, the mixture is calcined at 900 ℃ for 1.5 hours.

(2) And ball-milling the calcined powder and then screening to obtain hexaaluminate powder.

(3) Taking hexaaluminate powder with the granularity of 1000 meshes, and mixing the hexaaluminate powder with a cementing material and water according to the mass ratio of 7.5: 1: 1.5 to form a gelatinous material.

(4) And (3) coating the colloidal substance on the surface of the electric heating element at room temperature, and standing for 2 hours to obtain the hexaaluminate infrared heating film.

According to tests, the infrared emissivity of the infrared heating film obtained in the embodiment in a wave band of 1-25 μm is 0.965.

Example 3

Preparation of a hexaaluminate-based infrared heating film:

the procedure was carried out in the same manner as in example 1, except that the mass ratio of hexaaluminate powder, cement and water was 7: 1: 1.

the infrared heating film obtained in the embodiment has an infrared emissivity of 0.926 in a wave band of 1-25 μm.

Example 4

The same procedure as in example 1 was conducted, except that the hexaaluminate material was La₂O₃，Fe₂O₃，Al₂O₃The molar ratio is 1: 1: 11.

the infrared emissivity of the hexaaluminate-based infrared heating film obtained in the embodiment in the 1-25 μm wave band is 0.946 through tests.

Example 5

The same procedure as in example 1 was conducted, except that the hexaaluminate material was La₂O₃，Y₂O₃，NiO，Fe₂O₃And Al₂O₃The molar ratio is 1: 1: 1: 1.5: 44.

the infrared emissivity of the hexaaluminate-based infrared heating film obtained in the embodiment in the wavelength range of 1-25 μm is 0.972 through tests.

From the results of examples 1 to 5, it was confirmed that the infrared heating film of the present invention has high infrared emissivity in the band of 1 to 25 μm, has the advantages of fast heating speed and uniform heating, can effectively meet the heating requirement for heating non-combustible tobacco products, and can realize uniform heating of tobacco by coating the infrared heating film on the surface of a heating body.

The preferred embodiments of the present invention have been described in detail, however, the present invention is not limited to the specific details of the above embodiments, and various simple modifications may be made to the technical solution of the present invention within the technical idea of the present invention, and these simple modifications are within the protective scope of the present invention.

It should be noted that the various technical features described in the above embodiments can be combined in any suitable manner without contradiction, and the invention is not described in any way for the possible combinations in order to avoid unnecessary repetition.

In addition, any combination of the various embodiments of the present invention is also possible, and the same should be considered as the disclosure of the present invention as long as it does not depart from the spirit of the present invention.