阅读说明：本技术 一种蒸汽式医用雾化器用多孔碳化硅陶瓷及其制备方法 (Porous silicon carbide ceramic for steam type medical atomizer and preparation method thereof ) 是由 邬国平 焦永峰 谢方民 于明亮 熊礼俊 戚明杰 于 2019-11-11 设计创作，主要内容包括：本发明公开了一种蒸汽式医用雾化器用多孔碳化硅陶瓷及其制备方法,包括以下步骤：(1)原料配比：按以下比例称取原料：碳化硅40～70wt％,粘接剂10-30wt％,烧结助剂10-30wt％,造孔剂10-30wt％；以上各组分之和为100％；(2)混料制浆,(3)喷雾造粒,(4)压制成型,(5)烧结,(6)超亲处理：采用10～90％的醋酸溶液,在室温环境下,将多孔碳化硅陶瓷放入醋酸溶液浸泡2～10小时；(7)将多孔碳化硅陶瓷取出,清洗表面的醋酸溶液,最后烘干。该方法制备的雾化器具有高强度、安全卫生、不掉渣、导热快、耐热震、雾化快等特点。(The invention discloses a porous silicon carbide ceramic for a steam type medical atomizer and a preparation method thereof, wherein the preparation method comprises the following steps: (1) the raw material ratio is as follows: weighing the following raw materials in proportion: 40-70 wt% of silicon carbide, 10-30 wt% of adhesive, 10-30 wt% of sintering aid and 10-30 wt% of pore-forming agent; the sum of the above components is 100%; (2) mixing materials and pulping, (3) spraying and granulating, (4) pressing and forming, (5) sintering, (6) super-hydrophilic treatment: soaking the porous silicon carbide ceramic in an acetic acid solution for 2-10 hours at room temperature by adopting a 10-90% acetic acid solution; (7) and taking out the porous silicon carbide ceramic, cleaning the acetic acid solution on the surface, and finally drying. The atomizer prepared by the method has the characteristics of high strength, safety, sanitation, no slag falling, quick heat conduction, thermal shock resistance, quick atomization and the like.)

1. The utility model provides a medical atomizer of steam type is with porous carborundum pottery which characterized in that: the formula comprises the following components in parts by weight:

40-70 wt% of silicon carbide with the particle size range of 1-200 μm,

1-30 wt% of adhesive with the particle size range of 0.1-40 μm,

5-20 wt% of sintering aid with particle size of 0.1-100 μm,

10-40 wt% of pore-forming agent with the particle size range of 0.1-100 mu m;

the sum of the above components is 100%.

2. A preparation method of the porous silicon carbide ceramic for the steam type medical atomizer based on the claim 1 is characterized in that: the method comprises the following steps:

(1) the raw material ratio is as follows: weighing the following raw materials in proportion: 40-70 wt% of silicon carbide, 1-30 wt% of adhesive, 5-20 wt% of sintering aid and 10-40 wt% of pore-forming agent, wherein the sum of the components is 100%;

(2) mixing materials and pulping: putting the raw materials into mixing equipment, adding deionized water, and mixing, ball-milling or stirring to obtain ceramic slurry;

(3) spray granulation: spray drying and granulating the ceramic slurry;

(4) and (3) pressing and forming: putting the ceramic granulated material into a mould, and carrying out dry pressing to obtain a ceramic blank;

(5) and (3) sintering: placing the ceramic blank into a sintering furnace for sintering, and cooling to obtain porous silicon carbide ceramic, so that a silicon dioxide film is formed on the surface of the porous silicon carbide ceramic;

(6) super-hydrophilic treatment: soaking the porous silicon carbide ceramic in an acetic acid solution for 2-10 hours at room temperature by adopting a 10-90% acetic acid solution; hydrogen ions in the acetic acid solution are adsorbed to the surface of the silicon dioxide film of the porous ceramic;

(7) and taking out the porous silicon carbide ceramic, cleaning the acetic acid solution on the surface, and finally drying.

3. The preparation method of the porous silicon carbide ceramic for the steam type medical atomizer according to claim 2, wherein the preparation method comprises the following steps: the adhesive comprises an inorganic adhesive and an organic adhesive;

the inorganic adhesive comprises one or a combination of more of montmorillonite, illite, sepiolite, kaolin and palygorskite;

the organic adhesive comprises one or a combination of more of PVA, water-soluble cellulose, glucose and water-soluble phenolic resin.

4. The preparation method of the porous silicon carbide ceramic for the steam type medical atomizer according to claim 2, wherein the preparation method comprises the following steps: the sintering aid is one or a combination of more of magnesium oxide, silicon dioxide, aluminum oxide, calcium carbonate, titanium dioxide, glass powder and sodium silicate.

5. The preparation method of the porous silicon carbide ceramic for the steam type medical atomizer according to claim 2, wherein the preparation method comprises the following steps: the pore-forming agent comprises inorganic pore-forming agent and organic pore-forming agent,

the inorganic pore-forming agent comprises one or more of petroleum coke, activated carbon, graphite, charcoal, coke, coal powder, ammonium carbonate, ammonium bicarbonate and ammonium chloride;

the organic pore-forming agent comprises one or more of PVA, PMMA, PVB, starch, dextrin and cellulose.

6. The preparation method of the porous silicon carbide ceramic for the steam type medical atomizer according to claim 2, wherein the preparation method comprises the following steps: and (4) adding the ceramic granulation powder into a steel die by adopting a dry pressing forming process, and pressing and forming.

7. The preparation method of the porous silicon carbide ceramic for the steam type medical atomizer according to claim 2, wherein the preparation method comprises the following steps: the sintering furnace adopts a high-temperature sintering furnace with an air atmosphere, one of a muffle furnace, a tunnel kiln and a bell jar furnace is selected, the sintering temperature is 1300-1500 ℃, and the heat is preserved for 1-4 hours.

Technical Field

The invention relates to the field of medical instruments, in particular to a porous silicon carbide ceramic for a steam type medical atomizer and a preparation method thereof.

Background

The atomized inhalation therapy is an important and effective therapy method in the respiratory system disease therapy method, the medical atomized inhaler is adopted to atomize the liquid medicine into tiny particles, and the medicine enters the respiratory tract and the lung for deposition in a respiratory inhalation mode, thereby achieving the aim of painless, rapid and effective therapy. The medical atomizer belongs to two types of medical apparatus and instruments, and is mainly used for treating various upper and lower respiratory system diseases, such as diseases of trachea, bronchus, alveolus and chest cavity, such as cold, fever, cough, asthma, sore throat, pharyngitis, rhinitis, bronchitis, pneumoconiosis and the like.

The existing atomizer principle has three main types: ultrasonic atomizers, compression atomizers, and mesh atomizers. The three atomizers respectively adopt the vibration of ultrasonic waves, compressed air and a vibrator as power, all are mechanical force, and quickly form liquid medicine into fog drops, and the size of the fog drops is large, so most of generated medicine particles can only be deposited on upper respiratory tracts such as oral cavities, throats and the like. After the liquid medicine is inhaled into the respiratory tract of a patient, the liquid medicine is formed into water drops and hung on the wall of the inner cavity, the effect on the lower respiratory tract diseases is poor, the medicine demand is large, and the waste phenomenon is caused.

There have also been attempts to make an atomizer from ceramics, and to make an electric heating wire circuit on the surface of porous ceramics, and to heat the ceramic by energization to evaporate a chemical solution into droplets having an extremely small size. The steam type atomizer can reduce the size of liquid medicine fog drops, improve the atomization effect, improve the use efficiency of the liquid medicine, and can also be applied to the fields of medical atomizers, air humidifiers, electronic aromatherapy, liquid mosquito-repellent incense and the like. However, the prior art lacks a porous silicon carbide ceramic with the characteristics of high strength, no slag falling, thermal shock resistance, safety, sanitation and the like and a preparation method thereof.

Disclosure of Invention

The invention provides a porous silicon carbide ceramic for a steam type medical atomizer, which has the characteristics of high strength, no slag falling, thermal shock resistance, safety, sanitation and the like.

The invention has the technical scheme that the porous silicon carbide ceramic for the steam type medical atomizer is provided with the following mixture ratio: the formula comprises the following components in parts by weight:

40-70 wt% of silicon carbide with the particle size range of 1-200 μm,

1-30 wt% of adhesive with the particle size range of 0.1-40 μm,

5-20 wt% of sintering aid with particle size of 0.1-100 μm,

10-40 wt% of pore-forming agent with the particle size range of 0.1-100 mu m;

the sum of the above components is 100%

The invention also provides a preparation method of the porous silicon carbide ceramic for the steam type medical atomizer, which comprises the following steps:

(1) the raw material ratio is as follows: weighing the following raw materials in proportion: 40-70 wt% of silicon carbide, 1-30 wt% of adhesive, 5-20 wt% of sintering aid and 10-40 wt% of pore-forming agent, wherein the sum of the components is 100%;

(2) mixing materials and pulping: putting the raw materials into mixing equipment, adding deionized water, and mixing, ball-milling or stirring to obtain ceramic slurry;

(3) spray granulation: spray drying and granulating the ceramic slurry;

(4) and (3) pressing and forming: putting the ceramic granulated material into a mould, and carrying out dry pressing to obtain a ceramic blank;

(5) and (3) sintering: placing the ceramic blank into a sintering furnace for sintering, and cooling to obtain porous silicon carbide ceramic, so that a silicon dioxide film is formed on the surface of the porous silicon carbide ceramic;

(6) super-hydrophilic treatment: soaking the porous silicon carbide ceramic in an acetic acid solution for 2-10 hours at room temperature by adopting a 10-90% acetic acid solution; hydrogen ions in the acetic acid solution are adsorbed to the surface of the silicon dioxide film of the porous ceramic;

(7) and taking out the porous silicon carbide ceramic, cleaning the acetic acid solution on the surface, and finally drying.

The adhesive comprises an inorganic adhesive and an organic adhesive; the inorganic adhesive comprises one or a combination of more of montmorillonite, illite, sepiolite, kaolin and palygorskite; the organic adhesive comprises one or a combination of more of PVA, water-soluble cellulose, glucose and water-soluble phenolic resin.

The sintering aid is one or a combination of more of magnesium oxide, silicon dioxide, aluminum oxide, calcium carbonate, titanium dioxide, glass powder and sodium silicate.

The pore-forming agent comprises an inorganic pore-forming agent and an organic pore-forming agent, wherein the inorganic pore-forming agent comprises one or more of petroleum coke, activated carbon, graphite, charcoal, coke, coal powder, ammonium carbonate, ammonium bicarbonate and ammonium chloride; the organic pore-forming agent comprises one or more of PVA, PMMA, PVB, starch, dextrin and cellulose.

And (4) adding the ceramic granulation powder into a steel die by adopting a dry pressing forming process, and pressing and forming.

The sintering furnace adopts a high-temperature sintering furnace with an air atmosphere, one of a muffle furnace, a tunnel kiln and a bell jar furnace is selected, the sintering temperature is 1300-1500 ℃, and the heat is preserved for 1-4 hours.

After the formula and the steps are adopted, compared with the prior art, the invention has the following advantages:

(1) and (3) small fog drops: the atomized liquid drop size of the traditional medical atomizer is about 5 mu m on average, and the atomized liquid drop is difficult to reach alveoli. The atomizer has the average droplet size of 0.4-1 μm, can directly reach pulmonary alveoli, has remarkable effect on lower respiratory tract diseases, can improve the use efficiency of liquid medicine, and saves the liquid medicine.

(2) The working temperature is low: the silicon carbide has high intrinsic thermal conductivity and thermal shock resistance, and the prepared atomizer has high thermal conductivity and can quickly transfer heat generated by the heating wire to the whole atomizer, so that the temperature of the atomizer is uniform during working, the local overhigh temperature is effectively avoided, and the activity of liquid medicine is not influenced;

(3) super-hydrophilic surface imbibition is fast: the silicon carbide and the sintering aid in the ceramic are subjected to super-hydrophilic treatment, and the surface of the ceramic is fully covered with hydrogen bonds, so that the ceramic has super-hydrophilic capability on water-based or alcohol-based liquid medicine, the adsorption speed is accelerated, the atomization effect is guaranteed, and dry burning is avoided.

(4) The efficiency is high: the existing porous ceramics adopt gel injection molding, hot-pressing injection and other processes, and have the disadvantages of complicated process and low efficiency. The invention adopts the dry pressing forming process, automatically presses and greatly improves the production efficiency.

(5) High strength: the porous ceramic provided by the invention takes silicon carbide as a main body, and the silicon carbide main body is fully sintered by adopting the sintering aid, so that no slag is peeled off, and the bending strength of a sample can reach more than 20 MPa.

Description of the drawings:

FIG. 1 is a SEM microstructure of porous silicon carbide ceramic.

The specific embodiment is as follows:

in order to facilitate an understanding of the invention, specific examples are set forth below. All technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. These examples are provided so that this disclosure will be thorough and complete, and are not intended to limit the invention.