阅读说明：本技术 一种多孔陶瓷组合物及其制备方法和应用该陶瓷组合物的电子烟雾化芯 (Porous ceramic composition, preparation method thereof and electronic cigarette atomization core applying same ) 是由 赵波洋 赵贯云 屈雪平 胡勇齐 聂革 宋文正 齐会龙 李俊辉 于 2020-12-26 设计创作，主要内容包括：本发明公开了一种多孔陶瓷组合物及其制备方法和应用该陶瓷组合物的电子烟雾化芯,涉及多孔陶瓷技术领域。该多孔陶瓷组合物,按质量百分比计,包括紫砂土0-40％；硅藻土30-70％；石英砂1-20％；玻璃粉1-20％；造孔剂10-50％；其中,石英砂与玻璃粉的总量之和≤25％。本发明通过在多孔陶瓷组合物中添加紫砂土以提高多孔陶瓷与烟油的亲和性,提升抽烟口感。通过添加石英砂与玻璃粉以提高多孔陶瓷的抗折强度。解决了现有技术方案的多孔陶瓷强度较差,在装配时多孔陶瓷容易破损和掉粉,多孔陶瓷与金属发热线路的结合力差,容易导致金属发热线路与多孔陶瓷脱离而糊味的问题。本发明提供的多孔陶瓷制备方法简单,生产效率高。(The invention discloses a porous ceramic composition, a preparation method thereof and an electronic cigarette atomization core applying the ceramic composition, and relates to the technical field of porous ceramics. The porous ceramic composition comprises, by mass, 0-40% of purple sandy soil; 30-70% of diatomite; 1-20% of quartz sand; 1-20% of glass powder; 10-50% of pore-forming agent; wherein the sum of the total amount of the quartz sand and the glass powder is less than or equal to 25 percent. According to the invention, the purple sandy soil is added into the porous ceramic composition to improve the affinity of the porous ceramic and the tobacco tar and improve the smoking taste. The flexural strength of the porous ceramic is improved by adding quartz sand and glass powder. The problem of prior art scheme's porous ceramic intensity relatively poor, porous ceramic is damaged easily and fall the powder when the assembly, and porous ceramic is poor with the binding force of metal heating line, leads to metal heating line and porous ceramic to break away from easily and paste the flavor is solved. The preparation method of the porous ceramic provided by the invention is simple and has high production efficiency.)

1. The porous ceramic composition is characterized by comprising the following components in percentage by mass:

wherein the sum of the total amount of the quartz sand and the glass powder is less than or equal to 25 percent.

2. The porous ceramic composition of claim 1, wherein the purple sand comprises Na₂O、MgO、Al₂O₃、SiO₂、Fe₂O₃And K₂O; and the mass percentages of the components in the purple sandy soil are as follows:

Na₂O≤1.5％；

MgO≤2.5％；

Al₂O₃≥15％；

SiO₂≥18％；

Fe₂O₃≥5％；

K₂O≤7％。

3. the porous ceramic composition of claim 1, further comprising the following components:

4. the porous ceramic composition of claim 1, wherein the pore former is selected from at least one of polystyrene, polyvinyl chloride, methyl methacrylate, and polyvinyl alcohol.

5. The preparation method of the porous ceramic is characterized by comprising the following steps:

s1, preparing the porous ceramic composition according to any one of claims 1 to 4, and mixing the materials;

s2, putting the solvent into an internal mixer to melt, adding the material in the S1 after the solvent is completely melted, mixing and internally mixing to obtain blank paste; the solid content of the blank mud is 40-70%;

and S3, performing injection molding, degreasing and sintering on the blank mud to obtain the porous ceramic.

6. The method for preparing a porous ceramic according to claim 5, wherein the mass of the slurry after injection molding is defined as m1 and the mass after sintering is defined as m2, which satisfies m2/m1 ≥ 40%.

7. The method for preparing porous ceramic according to claim 5, wherein the solvent comprises paraffin wax, beeswax, stearic acid and a plasticizer, and the mass percentage of the solvent in the paste is as follows:

8. the method of claim 7, wherein the plasticizer is at least one selected from the group consisting of dibutyl phthalate, dioctyl phthalate, and dimethyl phthalate.

9. A porous ceramic produced from the porous ceramic composition according to any one of claims 1 to 4.

10. The porous ceramic of claim 9, wherein the porous ceramic has a porosity of 35 to 80% and a flexural strength of 6 to 45 Mpa.

11. Use of a porous ceramic as claimed in any one of claims 9 to 10 in an electronic aerosolized core.

12. An electronic aerosolization core comprising the porous ceramic of any of claims 9-10.

Technical Field

The invention relates to the technical field of porous ceramics, in particular to a porous ceramic composition, a preparation method thereof and an electronic cigarette atomization core applying the ceramic composition.

Background

The existing porous ceramics are prepared by taking diatomite as a main body and adding a certain amount of binder and pore-forming agent for sintering, and the strength of the existing porous ceramics is poor. During assembly, the porous ceramics are easy to damage and fall off, and the smoke taste is influenced by the falling off; in addition, the porous ceramic has poor binding force with the metal heating circuit, so that the metal heating circuit is easily separated from the ceramic substrate to generate burnt odor, the service life of a product is greatly shortened, the use experience of a user is greatly influenced, and certain harmful aerogel can be generated due to the burnt odor to damage the body health of the user.

Disclosure of Invention

The invention aims to solve the problems of poor strength and poor bonding force with a metal circuit of the existing porous ceramic for the electronic cigarette.

In order to solve the above problems, the present invention proposes the following technical solutions:

in a first aspect, the present invention provides a porous ceramic composition, comprising the following components, by mass:

wherein the sum of the total amount of the quartz sand and the glass powder is less than or equal to 25 percent.

The invention improves the flexural strength of the porous ceramic by adjusting the ratio of the quartz sand to the glass powder. The sum of the total amount of the quartz sand and the glass powder is not more than 25 percent, if the ratio of the quartz sand to the glass powder is too large, the porosity is small, the pore diameter of the porous ceramic is small, the porous ceramic is easy to deform after being sintered, the smoking taste is poor, and simultaneously the burnt taste is easy to occur.

Further, the purple sandy soil comprises Na₂O、MgO、Al₂O₃、SiO₂、Fe₂O₃And K₂O; and the mass percentages of the components in the purple sandy soil are as follows:

Na₂O≤1.5％；

MgO≤2.5％；

Al₂O₃≥15％；

SiO₂≥18％；

Fe₂O₃≥5％；

K₂O≤7％。

the purple sand soil is prepared from special components, and the using amount of each component can improve the affinity of a ceramic matrix and tobacco tar, improve the air permeability and oil leakage performance of the ceramic matrix and improve the smoking taste under the limitation of the invention. The mixed purple sand soil can be put into use after ball milling, pugging and other processes.

Further, the porous ceramic composition further comprises the following components:

further, the pore-forming agent is selected from at least one of polystyrene, polyvinyl chloride, methyl methacrylate and polyvinyl alcohol.

In a second aspect, the present invention provides a method for preparing a porous ceramic, comprising the steps of:

s1, preparing the materials according to the proportion of the porous ceramic composition of the first aspect, and uniformly mixing the materials;

s2, putting the solvent into an internal mixer to melt, adding the material in the S1 after the solvent is completely melted, mixing and internally mixing to obtain blank paste; the solid content of the blank mud is 40-70%;

and S3, performing injection molding, degreasing and sintering on the blank mud to obtain the porous ceramic.

Further, the mass of the blank paste after injection molding is defined as m1, and the mass after sintering is defined as m2, which meets the condition that m2/m1 is more than or equal to 40%.

It should be noted that, when the ratio m2/m1 is less than 40%, the blank slurry is easy to deform after the degreasing and sintering processes, and meanwhile, the strength of the finished product is low, which affects the service life of the product and reduces the yield of the product.

Further, the solvent comprises paraffin, beeswax, stearic acid and a plasticizer, and the mass percentage of the solvent in the blank paste is as follows:

further, the plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate or dimethyl phthalate.

In a third aspect, the present invention also provides a porous ceramic produced from the porous ceramic composition according to the first aspect.

Furthermore, the porosity of the porous ceramic is 35-80%, and the flexural strength is 6-45 MPa.

It should be noted that the porosity of the porous ceramic is preferably 35-80%, when the porosity is less than 35%, the oil absorption speed of the porous ceramic is slow, which is likely to cause burnt odor, and when the porosity is greater than 80%, the ceramic matrix is not strong enough, which is likely to be damaged and cracked during assembly, and at the same time, there is a risk of oil leakage.

The rupture strength of the porous ceramic is preferably 6-45Mpa, when the rupture strength is less than 6Mpa, the strength of the ceramic matrix is insufficient, the porous ceramic is easy to damage and crack during assembly, the surface of the ceramic matrix is easy to fall off, and meanwhile, the bonding strength between the metal heating circuit on the surface of the ceramic matrix and the ceramic matrix is poor, so that the metal heating circuit and the ceramic matrix are easy to fall off, the smell is easy to burn during suction, and the use experience and the service life of a product are influenced; when the breaking strength is more than 45Mpa, the ceramic substrate has poor oil absorption capability, which easily causes untimely oil removal during suction and burning of the smell.

The invention also provides application of the porous ceramic in an electronic cigarette atomization core.

The invention also provides an electronic cigarette atomizing core which comprises the porous ceramic.

Compared with the prior art, the invention can achieve the following technical effects:

according to the porous ceramic provided by the invention, the purple sandy soil is added into the porous ceramic composition to improve the affinity of the porous ceramic and tobacco tar and improve the smoking taste. The flexural strength of the porous ceramic is improved by adding quartz sand and glass powder. The problem of prior art scheme's porous ceramic intensity relatively poor, porous ceramic is damaged easily and fall the powder when the assembly, and porous ceramic is poor with the binding force of metal heating line, leads to metal heating line and porous ceramic to break away from easily and paste the flavor is solved.

The preparation method of the porous ceramic provided by the invention is simple and has high production efficiency.

Detailed Description

The technical solutions in the examples will be clearly and completely described below. It is apparent that the embodiments to be described below are only a part of the embodiments of the present invention, and not all of them. 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.

It will be understood that the terms "comprises" and/or "comprising," when used in this specification and the appended claims, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof.

It is also to be understood that the terminology used in the description of the embodiments of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the embodiments of the invention. As used in the description of embodiments of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

The embodiment of the invention provides a porous ceramic composition which comprises the following components in percentage by mass:

wherein the sum of the total amount of the quartz sand and the glass powder is less than or equal to 25 percent.

Specifically, the purple sandy soil comprises Na₂O、MgO、Al₂O₃、SiO₂、Fe₂O₃And K₂O; and the mass percentages of the components in the purple sandy soil are as follows:

Na₂O≤1.5％；

MgO≤2.5％；

Al₂O₃≥15％；

SiO₂≥18％；

Fe₂O₃≥5％；

K₂O≤7％。

the purple sandy soil is prepared by special components, and the dosage of each component can improve the affinity of a ceramic matrix and tobacco tar under the limitation of the invention, and simultaneously improve the air permeability and oil leakage performance of the ceramic matrix and the smoking taste. The mixed purple sand soil can be put into use after ball milling, pugging and other processes.

The pore-forming agent is selected from at least one of polystyrene, polyvinyl chloride, methyl methacrylate and polyvinyl alcohol.

The preparation method of the porous ceramic provided by the embodiment of the invention can be prepared by various methods known to those skilled in the art.

The preparation process of the porous ceramic of the present invention is well known to those skilled in the art, and the typical preparation process is to obtain the porous ceramic by batching, mixing, banburying, injection molding, degreasing and sintering.

For example, in one embodiment, the method of making a porous ceramic of the present invention comprises the steps of:

s1, mixing the materials according to the proportion of the porous ceramic composition, and uniformly mixing the materials;

s2, putting the solvent into an internal mixer to melt, adding the material in the S1 after the solvent is completely melted, mixing and internally mixing to obtain blank paste; the solid content of the blank mud is 40-70%;

and S3, performing injection molding, degreasing and sintering on the blank mud to obtain the porous ceramic.

The mass of the blank paste after injection molding is defined as m1, and the mass after sintering is defined as m2, which meets the condition that m2/m1 is more than or equal to 40 percent.

It should be noted that, when the ratio m2/m1 is less than 40%, the blank slurry is easy to deform after the degreasing and sintering processes, and meanwhile, the strength of the finished product is low, which affects the service life of the product and reduces the yield of the product.

In the embodiment of the invention, the solvent comprises paraffin, beeswax, stearic acid and a plasticizer, and the mass percentage of the solvent in the blank paste is as follows:

further, the plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate or dimethyl phthalate.

In the embodiment of the invention, the porosity test method of the porous ceramic is a vacuum saturated water method, and the specific test method comprises the following steps:

drying the sample, weighing the sample on an analytical balance to record the weight as the dry weight, putting the sample into purified water under the vacuum condition to absorb water, continuously discharging bubbles on the surface of the sample, weighing the sample full of water when no bubbles are discharged, weighing the mass of the sample full of water in the water on the analytical balance to record as the wet weight of the saturated sample, taking out the sample, sucking the surface water by using a sponge, weighing the weight of the sample again to record as the dry weight of the saturated sample, and calculating the porosity according to the dry weight, the wet weight of the saturated sample and the dry weight of the saturated sample.

In the embodiment of the invention, the flexural strength test method of the porous ceramic comprises the following steps:

the solid powder of the porous ceramic composition is dry-pressed into strips, the length and width of a dry-pressing die are 30 x 3mm, the height of each strip is determined by the weight of the added solid powder, 2g of the solid powder is generally added, the shrinkage rates are inconsistent due to different formulas, the size of each strip is not fixed, the size of each obtained strip is generally 30 x 3 x 4mm, and a three-point bending strength test is carried out after sintering and forming.

In the embodiment of the invention, the lipophilicity testing method of the porous ceramic comprises the following steps:

1. adding test tobacco tar into a culture dish (circular shape, inner diameter of 4cm), wherein the total weight is 12 +/-0.05 g;

2. taking a piece of porous ceramic by using tweezers, putting the porous ceramic into the center of a culture dish, and timing by using a stopwatch;

3. observing the smoke oil to be absorbed into the porous ceramic until the smoke oil is completely absorbed into the porous ceramic, and stopping timing;

4. the stopwatch display data was recorded as oil absorption time.

Lipophilicity evaluation criteria

The lipophilicity of the porous ceramic is judged according to the oil absorption speed of the porous ceramic, and the higher the oil absorption speed of the porous ceramic is, the better the lipophilicity is.

Examples 1-3 and comparative examples 1-3 specific components for preparing porous ceramics and corresponding performance index test results for porosity, flexural strength, and oleophilicity of the porous ceramics are shown in the following table.

TABLE 1 specific compositions of porous ceramics of examples 1-3 and comparative examples 1-3

In table 1, the percentage of each component of the solute is based on the total amount of the porous ceramic composition (solute); the percentage content of each component of the solvent is based on the total amount of the blank mud.

TABLE 2 results of performance test of the porous ceramics of examples 1 to 3 and comparative examples 1 to 3

As can be seen from the above tables 1-2, the porosity of the porous ceramic prepared in comparative example 1 is 48% and the breaking strength is 7MPa, but the oil absorption speed is 78s, which is not ideal compared with the oil absorption speed 31s of example 1, and the porosity of the porous ceramic prepared in example 1 is 67%, the breaking strength is 12MPa and the oil absorption speed is 31s, which are measured by adding 10% of purple sand soil. Therefore, the compatibility of the porous ceramic and the tobacco tar can be improved by adding the purple sand soil into the porous ceramic, and the smoking taste is improved.

In comparative example 2, the total mass percentage of the quartz sand and the glass powder was 30%, the porosity of the prepared porous ceramic was 22%, the flexural strength was 51MPa, and the oil absorption rate was 203s, but the oil absorption rate was sacrificed although the excellent flexural strength was obtained. In the embodiment 2, the total mass percentage of the quartz sand and the glass powder is 20%, the porosity of the prepared porous ceramic is 61%, the breaking strength is 37MPa, the oil absorption speed is 38s, and the three performance indexes can meet the requirements. Therefore, the addition of quartz sand and glass powder in the porous ceramic can improve the breaking strength of the porous ceramic and has good oil absorption performance.

The solid content in the comparative example 3 is 30%, the porosity of the prepared porous ceramic is 81%, the breaking strength is 2.5MPa, the oil absorption speed is 27s, the breaking strength is less than 7, the requirement is not met, and the porous ceramic cannot be used. The solid content in example 3 is 45%, the porosity of the prepared porous ceramic is 67%, the breaking strength is 12MPa, the oil absorption speed is 31s, and all three performance indexes are excellent.

In the above embodiments, the descriptions of the respective embodiments have respective emphasis, and for parts that are not described in detail in a certain embodiment, reference may be made to related descriptions of other embodiments.

While the invention has been described with reference to specific embodiments thereof, it will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.