WO2022134770A1

WO2022134770A1 - Porous ceramic composition and method for preparation thereof and electronic cigarette vaporization core using ceramic composition

Info

Publication number: WO2022134770A1
Application number: PCT/CN2021/124397
Authority: WO
Inventors: 赵波洋; 赵贯云; 屈雪平; 胡勇齐; 聂革; 宋文正; 齐会龙; 李俊辉
Original assignee: 深圳市吉迩科技有限公司
Priority date: 2020-12-26
Filing date: 2021-10-18
Publication date: 2022-06-30
Also published as: CN112679202A

Abstract

Provided are a porous ceramic composition and method for preparation thereof and an electronic cigarette vaporization core using said ceramic composition. The porous ceramic composition comprises, by mass percentage, purple sand clay 0-40%, diatomaceous earth 30-70%, quartz sand 1-20%, glass powder 1-20%, and pore forming agent 10-50%; the sum of the total amount of quartz sand and glass powder is ≤ 25%. The affinity of the porous ceramic with e-cigarette liquid is improved by means of adding purple sand clay to the porous ceramic composition, improving the taste of smoking; the flexural strength of the porous ceramic is improved by means of adding quartz sand and glass powder. The invention solves the existing problems of porous ceramic having poor strength and being prone to break and lose powder during assembly, and having poor adhesion with a metal heating circuit, thus causing the metal heating circuit to detach from the porous ceramic and produce a burnt smell.

Description

Porous ceramic composition and preparation method thereof, and electronic cigarette atomizing core using the same

This application is required to be submitted to the China Patent Office on December 26, 2020, the application number is 202011570309.6, and the Chinese patent application titled "a porous ceramic composition and its preparation method and electronic cigarette core using the same" , the entire contents of which are incorporated herein by reference.

technical field

The present application relates to the technical field of porous ceramics, and in particular, to a porous ceramic composition, a preparation method thereof, and an electronic cigarette wick using the ceramic composition.

Background technique

Existing porous ceramics are mainly made of diatomite, and are made by adding certain binders and pore-forming agents to form sintering. Their strength is poor, and such porous ceramics are easily damaged and powdered during assembly. It affects the taste of smoke; in addition, the poor bonding force between such porous ceramics and metal heating circuits can easily lead to the separation of metal heating circuits and ceramic substrates and cause a sticky smell, which greatly shortens the service life of the product and greatly affects the user experience. The odor can produce certain harmful aerogels, which can cause damage to the user's health.

Application content

The present application aims to solve the problems of poor strength and poor bonding force with metal circuits of the existing porous ceramics for electronic cigarettes.

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

In a first aspect, the present application provides a porous ceramic composition, which in mass percentage, comprises the following components:

Among them, the sum of the total amount of quartz sand and glass powder is less than or equal to 25%.

It should be noted that the present application improves the flexural strength of porous ceramics by adjusting the ratio of quartz sand to glass powder. The sum of the total amount of quartz sand and glass powder is not more than 25%. If the proportion of the two is too large, the porosity will be small, resulting in a small pore size of the porous ceramic, which is easy to deform after sintering, and the smoking taste is poor, and it is easy to have a paste smell. .

Further, the purple sand soil includes: Na ₂ O, MgO, Al ₂ O ₃ , SiO ₂ , Fe ₂ O ₃ and K ₂ O; and the mass percentage of each component in the purple sand soil is as follows:

Na ₂ O≤1.5%

MgO≤2.5%

Al ₂ O ₃ ≥15%

SiO ₂ ≥18%

Fe ₂ O ₃ ≥5%

K ₂ O≤7%.

It should be noted that the purple sand soil described in this application is formulated with special components, and the amount of each component can improve the affinity of the ceramic matrix and the e-liquid under the limitation of this application, and at the same time improve the permeability of the ceramic matrix. Oil leakage performance, improve smoking taste. The prepared purple sand soil can be put into use after ball milling, mud refining and other processes.

Further, the porous ceramic composition also includes 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 application provides a method for preparing porous ceramics, comprising the following steps:

S1, proportioning by the ratio of the porous ceramic composition described in the first aspect, and mixing the material;

S2, put the solvent into an internal mixer to melt, and after the solvent is completely melted, add the materials in S1 to mix and mix to obtain a green mud; the solid content of the green mud is 40-70%;

S3, performing injection molding, degreasing and sintering on the green mud to obtain porous ceramics.

Further, define the mass of the green mud after injection molding as m1 and the mass after sintering as m2, which satisfy m2/m1≥40%.

It should be noted that when the m2/m1 ratio is less than 40%, the sludge is easily deformed after the degreasing and sintering processes, and the strength of the finished product is low, which affects the service life of the product and reduces the product qualification rate.

Further, the solvent includes paraffin, beeswax, stearic acid and plasticizer; and the mass percentage of each component in the mud 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 application also provides a porous ceramic, which is prepared according to the porous ceramic composition, and the porous ceramic composition, in terms of mass percentage, comprises the following components:

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

It should be noted that the porosity of the porous ceramics is preferably 35-80%. When the porosity is less than 35%, the oil absorption speed of the porous ceramics is slow, which is likely to cause a sticky smell. When the porosity is greater than 80%, the ceramic The strength of the matrix is not enough, it is easy to break and crack during assembly, and there is a risk of oil leakage.

The flexural strength of the porous ceramic is preferably 6-45Mpa. When the flexural strength is less than 6Mpa, the strength of the ceramic matrix is not enough, and it is easy to be damaged and cracked during assembly. The bonding strength between the metal heating circuit and the ceramic substrate is poor, which is easy to cause the metal heating circuit and the ceramic substrate to fall off. Poor, it is easy to cause the oil not to be released in time during the suction, and the smell is sticky.

Na ₂ O≤1.5%

MgO≤2.5%

Al ₂ O ₃ ≥15%

SiO ₂ ≥18%

Fe ₂ O ₃ ≥5%

K ₂ O≤7%.

Further, the porous ceramic composition also includes the following components:

The application also provides the application of the porous ceramic in the electronic cigarette wick.

The present application also provides an electronic cigarette wick, comprising the porous ceramic described in the third aspect.

Compared with the prior art, the technical effects that the application can achieve include:

In the porous ceramic provided by the present application, purple clay is added to the porous ceramic composition to improve the affinity between the porous ceramic and e-liquid, and improve the taste of smoking. The flexural strength of porous ceramics can be improved by adding quartz sand and glass powder. It solves the problems that the strength of the porous ceramics in the prior art solution is poor, the porous ceramics are easily damaged and fall off during assembly, the bonding force between the porous ceramics and the metal heating circuit is poor, and the metal heating circuit and the porous ceramics are easily separated and smelly.

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

Detailed ways

The technical solutions in the embodiments will be described clearly and completely below. Obviously, the embodiments to be described below are only a part of the embodiments of the present application, but not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

It is to be understood that, when used in this specification and the appended claims, the terms "comprising" and "comprising" indicate the presence of the described features, integers, steps, operations, elements and/or components, but do not exclude one or The presence or addition of a number of other features, integers, steps, operations, elements, components, and/or sets thereof.

It should also be understood that the terms used in the description of the embodiments of the present application are only for the purpose of describing specific embodiments and are not intended to limit the embodiments of the present application. As used in the present description of the examples and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural unless the context clearly dictates otherwise.

The embodiments of the present application provide a porous ceramic composition, which, in mass percent, includes the following components:

Specifically, the purple sand soil includes: Na ₂ O, MgO, Al ₂ O ₃ , SiO ₂ , Fe ₂ O ₃ and K ₂ O; and the mass percentage of each component in the purple sand soil is as follows:

Na ₂ O≤1.5%

MgO≤2.5%

Al ₂ O ₃ ≥15%

SiO ₂ ≥18%

Fe ₂ O ₃ ≥5%

K ₂ O≤7%.

It should be noted that the purple clay soil described in the examples of this application is formulated with special components, and the dosage of each component can improve the affinity between the ceramic matrix and the e-liquid, and at the same time improve the Breathable and oil-proof performance, improve smoking taste. The prepared purple sand soil can be put into use after ball milling, mud refining and other processes.

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

The preparation methods of the porous ceramics provided in the examples of the present application can be prepared by various methods well known to those skilled in the art.

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

For example, in one embodiment, the porous ceramic preparation method of the present application includes the following steps:

S1, proportioning according to the proportion of the porous ceramic composition, and mixing the material;

The mass of the blank after injection molding is defined as m1, and the mass after sintering is defined as m2, which satisfies m2/m1≥40%.

In the embodiment of the present application, the solvent includes paraffin, beeswax, stearic acid and plasticizer, and its mass percentage in the mud is as follows:

In the embodiment of the present application, the porosity test method of porous ceramics is the vacuum saturated water method, and the specific test method is as follows:

Dry the sample, weigh the sample on an analytical balance and record it as the dry weight. Put the sample into pure water under vacuum to absorb water, and bubbles continue to emerge from the surface of the sample. When no bubbles emerge, the sample is full of water. Weigh the mass of the water-filled sample in water on the analytical balance, and record it as the wet weight of the saturated sample. Take out the sample and use a sponge to absorb the surface water, re-weigh the sample, and record it as the dry weight of the saturated sample. The porosity was calculated from the dry weight of the heavy and saturated samples.

In the embodiment of the present application, the flexural strength test method of porous ceramics is as follows:

Dry-press the solid powder of the porous ceramic composition into strips. The length and width of the dry-pressing die is 30*3mm. The height of the strip is determined by the weight of the solid powder added. Generally, 2g is added. Due to the inconsistent shrinkage rate of different formulas, the size of the strip is not fixed. , the size of the strip is generally 30*3*4mm, and the three-point flexural strength test is carried out after sintering.

In the examples of the present application, the lipophilicity test method of porous ceramics is as follows:

1. Add the test e-liquid into the petri dish (round, inner diameter 4cm), the total weight is 12±0.05g;

2. Take a porous ceramic with tweezers, put it in the center of the petri dish, and time it with a stopwatch;

3. Observe the e-liquid inhaling the porous ceramic until the e-liquid is completely absorbed into the porous ceramic, and stop the timing at the same time;

4. Record the stopwatch and display the data as the oil absorption time.

Lipophilicity Evaluation Criteria

According to the oil absorption speed of porous ceramics, its lipophilicity is judged. The faster the oil absorption speed of porous ceramics, the better its lipophilicity.

The specific components of the porous ceramics prepared in Examples 1-3 and Comparative Examples 1-3 and the corresponding test results of the performance indexes of the porous ceramics in terms of porosity, flexural strength and lipophilicity are shown in the following table.

Table 1 Specific components of the porous ceramics of Examples 1-3 and Comparative Examples 1-3

It should be noted that, in Table 1, the percentage content 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 mud. benchmark.

Table 2 Performance test results of porous ceramics of Example 1-3 and Comparative Example 1-3

It can be seen from the above table 1-2 that no purple clay is added in the comparative example 1, and the prepared porous ceramic has a porosity of 48% and a flexural strength of 7MPa after testing, but the oil absorption speed is 78s, compared with the oil absorption of Example 1. For the speed of 31s, the effect is very unsatisfactory. In Example 1, 10% of purple clay is added, and the porous ceramic prepared has a porosity of 67%, a flexural strength of 12MPa, and an oil absorption speed of 31s. It can be seen that adding purple clay to porous ceramics can improve the affinity between porous ceramics and e-liquid, and improve the taste of smoking.

In Comparative Example 2, the total mass percentage of quartz sand and glass powder is 30%, the porosity of the prepared porous ceramic is 22%, the flexural strength is 51MPa, and the oil absorption speed is 203s. But at the expense of oil absorption speed. In Example 2, the total mass percentage of quartz sand and glass powder is 20%, the porosity of the prepared porous ceramic is 61%, the flexural strength is 37MPa, and the oil absorption speed is 38s, all three performance indicators can meet the requirements. It can be seen that adding quartz sand and glass powder to porous ceramics can improve the flexural strength of porous ceramics and has good oil absorption performance.

The solid content in Comparative Example 3 is 30%, the porosity of the prepared porous ceramic is 81%, the flexural strength is 2.5MPa, the oil absorption speed is 27s, and the flexural strength is less than 7, which does not meet the requirements and cannot be used. In Example 3, the solid content is 45%, the porosity of the prepared porous ceramic is 67%, the flexural strength is 12MPa, the oil absorption speed is 31s, and the three performance indicators are excellent.

In the above-mentioned embodiments, the description of each embodiment has its own emphasis. For parts that are not described in detail in a certain embodiment, reference may be made to the relevant descriptions of other embodiments.

The above are the specific embodiments of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art can easily think of various equivalent modifications within the technical scope disclosed in the present application. or replacement, these modifications or replacements should be covered within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

A porous ceramic composition, by mass percentage, comprising the following components:

Among them, the sum of the total amount of quartz sand and glass powder is less than or equal to 25%.
The porous ceramic composition of claim 1, wherein the purple clay comprises: Na 2 O, MgO, Al 2 O 3 , SiO 2 , Fe 2 O 3 and K 2 O; The mass percentage in purple sand soil is as follows:

Na 2 O≤1.5%

MgO≤2.5%

Al 2 O 3 ≥15%

SiO 2 ≥18%

Fe 2 O 3 ≥5%

K 2 O≤7%.
The porous ceramic composition of claim 1, wherein the porous ceramic composition further comprises the following components:
The porous ceramic composition of claim 1, wherein the pore-forming agent is selected from at least one of polystyrene, polyvinyl chloride, methyl methacrylate and polyvinyl alcohol.
A preparation method of porous ceramics, comprising the following steps:

S1, batching according to the proportion of the porous ceramic composition described in any one of claims 1-4, and mixing material;

S2, put the solvent into an internal mixer to melt, and after the solvent is completely melted, add the materials in S1 to mix and mix to obtain a green mud; the solid content of the green mud is 40-70%;

S3, performing injection molding, degreasing and sintering on the green mud to obtain porous ceramics.
The method for preparing porous ceramics according to claim 5, wherein the mass of the slime after injection molding is defined as m1, and the mass after sintering is defined as m2, which satisfies m2/m1≥40%.
The preparation method of porous ceramics as claimed in claim 5, wherein, the solvent comprises paraffin, beeswax, stearic acid and plasticizer, and its mass percentage in the mud is as follows:
The method for preparing porous ceramics according to claim 7, wherein the plasticizer is selected from at least one of dibutyl phthalate, dioctyl phthalate or dimethyl phthalate .
A porous ceramic, prepared according to a porous ceramic composition, the porous ceramic composition, in terms of mass percentage, comprises the following components:

Among them, the sum of the total amount of quartz sand and glass powder is less than or equal to 25%.
The porous ceramic of claim 9, wherein the porous ceramic has a porosity of 35-80% and a flexural strength of 6-45 Mpa.
The porous ceramic according to claim 9, wherein the purple sand soil comprises: Na 2 O, MgO, Al 2 O 3 , SiO 2 , Fe 2 O 3 and K 2 O; The mass percentages in are as follows:

Na 2 O≤1.5%

MgO≤2.5%

Al 2 O 3 ≥15%

SiO 2 ≥18%

Fe 2 O 3 ≥5%

K 2 O≤7%.
The porous ceramic of claim 9, wherein the porous ceramic composition further comprises the following components:
The porous ceramic of claim 9, wherein the pore-forming agent is at least one selected from the group consisting of polystyrene, polyvinyl chloride, methyl methacrylate and polyvinyl alcohol.
Application of the porous ceramic according to any one of claims 9 to 13 in an electronic cigarette wick.
An electronic cigarette wick, comprising the porous ceramic according to any one of claims 9-13.