CN114176414A

CN114176414A - Composite material for non-stick cookware, method for manufacturing same and non-stick cookware

Info

Publication number: CN114176414A
Application number: CN202111549673.9A
Authority: CN
Inventors: 张明; 李超; 瞿义生; 袁华庭
Original assignee: Wuhan Supor Cookware Co Ltd
Current assignee: Wuhan Supor Cookware Co Ltd
Priority date: 2021-12-17
Filing date: 2021-12-17
Publication date: 2022-03-15

Abstract

The invention provides a composite material for non-stick cookers, a manufacturing method thereof and the non-stick cookers. The composite material comprises, based on the total weight of the composite material: 68 wt% to 99 wt% of a ceramic material, 0 wt% to 30 wt% of a metallic material, and 1 wt% to 2 wt% of a binder, wherein the ceramic material comprises one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide. Therefore, the non-stick cookware including the non-stick coating comprising the composite material has improved initial non-stick property, and achieves the effects of stable material quality, high hardness, high temperature resistance, long non-stick life, and the like.

Description

Composite material for non-stick cookware, method for manufacturing same and non-stick cookware

Technical Field

The present invention relates to a composite material for non-stick cookware and a method of manufacturing the same, and non-stick cookware, and more particularly, to a composite material for non-stick cookware comprising an optional metallic material and a ceramic material, a method of manufacturing the same, and non-stick cookware.

Background

Since the frying pan, the soup pan or the pan is the most important appliance for conditioning food and is closely related to the health of people and daily life, the pan with good quality is required to be heated evenly, dishes are not stuck to the pan when being fried, and simultaneously, the pan can be rust-proof, corrosion-resistant and can meet the requirements of users.

Most of non-stick cookware used for cooking food at present adopts fluororesin as non-stick coating. However, the non-stick cookware made of the fluororesin has the problems of short service life and the like, and mainly comprises the following aspects:

1. is easy to be scratched: because the fluororesin is a high polymer material and has lower hardness, when hard food (such as shells and the like) is stir-fried, the surface of the non-stick coating of the non-stick pan is easy to scratch, so that the service life of the non-stick pan is shorter;

2. no high temperature resistance: the fluororesin is a high-molecular resin, the common cooking environment of Chinese dishes is a high-temperature environment, and the fluororesin serving as a non-stick coating material is easy to denature under a long-time high-temperature condition, so that the non-stick property of the non-stick cookware is lost;

3. the use experience is poor: when the non-stick coating using the fluorine resin is used for a frying pan or a soup pan, the use experience is good, but when the non-stick coating is used for the frying pan, a non-stick pan adapting shovel with soft material (for example, silica gel and the like) is required to be used for cooking, which is not suitable for common cooking conditions (for example, quick frying, stir frying and the like) of Chinese dishes, and the use experience of a user is poor.

Therefore, it is necessary to develop a new non-stick coating material to improve the properties of non-stick property, hardness, durability, etc. of the non-stick cookware.

Disclosure of Invention

The present invention is directed to solving the above-mentioned technical problems in the related art. Therefore, the present invention is directed to provide a composite material for a non-stick cookware, a method of manufacturing the same, and a non-stick cookware, thereby realizing a non-stick cookware having improved initial non-stick property, high hardness, high wear resistance, high corrosion resistance, and the like.

According to one aspect of the present invention there is provided a composite material for non-stick cookware, the composite material comprising, based on the total weight of the composite material: 68 wt% to 99 wt% of a ceramic material, 0 wt% to 30 wt% of a metallic material, and 1 wt% to 2 wt% of a binder, wherein the ceramic material comprises one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide. By including a predetermined weight of optional metallic and ceramic materials, the composite material can have high hardness and high stability, thereby achieving good non-stick properties.

In an embodiment of the invention, the metallic material comprises one or more of titanium, titanium alloy, iron, stainless steel, low carbon steel, high carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy; the binder includes one or more of a cellulose-based binder and an alcohol-based binder. By including a predetermined metal material and a binder, the composite material may have high hardness, high stability, and good high temperature resistance, among other properties.

In embodiments of the invention, the cellulosic binder comprises one or more of hydroxymethyl cellulose, hydroxyethyl cellulose and hydroxypropyl methyl cellulose; the alcohol binder includes one or more of polyvinyl alcohol and polypropylene alcohol. By using a predetermined binder, the porosity of the non-stick coating can be increased and the non-stick properties improved.

In an embodiment of the present invention, the content of the metal material is 1 wt% to 30 wt% based on the total weight of the composite material, and the particle size of the ceramic material is smaller than the particle size of the metal material. By controlling the content of the metal material and the particle size of the ceramic material and the metal material, the composite material can have the properties of high hardness, high stability, good initial non-adhesiveness and the like.

According to another aspect of the present invention there is provided a method of manufacturing a composite material for non-stick cookware, the method comprising the steps of: dissolving a binder and an auxiliary agent in water to obtain a mixed solution; adding a ceramic material and an optional metal material into the mixed solution to obtain mixed slurry; and carrying out spray drying and sintering on the mixed slurry to obtain a composite material, wherein the composite material comprises the following components in percentage by weight based on the total weight of the composite material: 68 wt% to 99 wt% of a ceramic material, 0 wt% to 30 wt% of a metallic material, and 1 wt% to 2 wt% of a binder, the ceramic material including one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide. The non-stick cookware obtained by this method with the use of the above composite material has high stability, high hardness and improved initial non-stick properties.

In embodiments of the invention, the adjuvant comprises one or more of a dispersant and a defoamer; the dispersant comprises one or more of citric acid and triethylhexylphosphoric acid; the defoaming agent includes one or more of polyether-modified silicone oil and silicone oil. By including the predetermined auxiliary agent, the optional metallic material and the ceramic material can be uniformly dispersed in the mixed solution, facilitating the subsequent process treatment.

In an embodiment of the present invention, the auxiliary agent includes a combination of a dispersant and an antifoaming agent, and the content of the dispersant is 0.5 wt% to 1 wt% and the content of the antifoaming agent is 1 wt% to 2 wt%, based on the total weight of the mixed slurry. By controlling the contents of the dispersant and the defoamer included in the adjuvant within a predetermined range, the optional metallic material and ceramic material can be uniformly dispersed in the mixed solution, reducing the process cost and avoiding the problem of unsmooth production of the subsequent process.

In an embodiment of the present invention, the step of spray-drying is performed at a rotation speed of 6000 to 15000 revolutions per minute and at a temperature of 100 to 400 ℃; and a step of heating to a predetermined temperature at a heating rate of 5 to 10 ℃/min and then holding for 3 to 10 hours to remove water in the mixed slurry to perform sintering. By controlling the rotating speed and temperature in the spray drying process and the heating rate and the heat preservation time in the sintering process, the process efficiency can be improved, and the process cost can be reduced.

In an embodiment of the invention, the method further comprises: grinding the ceramic material and the metal material prior to the step of adding the ceramic material and the optional metal material to the mixed solution, wherein the grain size of the ground ceramic material is smaller than the grain size of the ground metal material. By controlling the particle size of the ceramic material to be smaller than that of the metal material through the grinding process, the initial non-tackiness of the composite material can be improved, thereby achieving non-tackiness properties.

According to another aspect of the present invention, there is provided a non-stick cookware comprising: a substrate including an inner surface for carrying an article and an outer surface facing away from the inner surface; and a non-stick coating disposed on an inner surface of the substrate and comprising the composite material described above. The non-stick cooker has high hardness, high wear resistance, high heat resistance and improved initial non-stick property, and can achieve the durable non-stick use effect.

According to embodiments of the present invention, a composite material for non-stick cookware, a method of manufacturing the same, and non-stick cookware are provided. The non-stick cookware comprises a composite material comprising an optional metal material and a ceramic material, thereby having the properties of high hardness, high wear resistance, high temperature resistance, improved initial non-stick property and the like, and realizing the non-stick effect.

Drawings

The above and/or other features and aspects of the present invention will become apparent and appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings.

FIG. 1 is a schematic view of a non-stick cookware according to an embodiment of the present invention.

FIG. 2 is a flow diagram of a method of manufacturing a composite material according to an embodiment of the invention.

Fig. 3 is an SEM picture of the composite material according to example 1 of the present invention.

Detailed Description

Exemplary embodiments of the present invention will be described in more detail below. While exemplary embodiments of the present invention are described below, it should be understood that the present invention may be embodied in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

As previously mentioned, the non-stick coatings included in non-stick cookware in the prior art have more or less certain functional drawbacks, and the present invention proposes a composite material for non-stick coatings with more optimal properties.

In the process of manufacturing the non-stick coating, in order to improve the non-stick property of the non-stick coating, the porosity of the non-stick coating must be increased. When the formed non-stick coating has a certain porosity, the pores can provide a certain oil storage effect, and the non-stick property of the oil storage is achieved. Meanwhile, when the surface of the finally formed non-stick coating also has a certain micro-rough structure, the micro-rough structure of the surface can provide a structure similar to a lotus leaf. In the interior of these surface micro-rough structures, the oil storage effect can be achieved, and the non-stick property of the non-stick coating is further improved.

Generally, a non-stick coating can have some non-stick properties when it has one or more of the following characteristics: the non-stick coating has certain porosity; the granulated powder forming the non-stick coating has a certain porosity by itself; at least a part of the surface of the granulated powder is bonded by powder having a small particle diameter; the proportion of metal material in the granulated powder is small or even none.

In the embodiment of the invention, in order to ensure that the finally formed non-stick coating has better non-stick property, the composite material for the non-stick coating is preferably manufactured by granulating the metal material and the non-metal material or granulating the non-metal material by itself. The main reason for this is that if the ratio of the metal material in the granulated powder is high, good non-sticking effect is not exerted due to the relatively low ratio of the binder even if the binder for granulation is present because the surface energy of the metal material itself is high. Therefore, in the embodiments of the present invention, granulation between the metal material and the metal material is not a technical choice.

In an embodiment of the invention, a composite material for a non-stick cookware includes a ceramic material, an optional metallic material, and a binder. Specifically, the composite material for non-stick cookware comprises 68 wt% to 99 wt% of a ceramic material, 0 wt% to 30 wt% of a metallic material, and 1 wt% to 2 wt% of a binder, based on the total weight of the composite material.

In an embodiment of the present invention, the ceramic material included in the composite material may include one or more of titanium oxide, titanium nitride, titanium carbide, triiron tetroxide, ferric oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide.

In embodiments of the invention, the weight of the ceramic material may be 68 wt% to 99 wt%, based on the total weight of the composite material. For example, the weight of the ceramic material can be 68 wt% to 98 wt%, 68 wt% to 97 wt%, 69 wt% to 97 wt%, 70 wt% to 96 wt%, 71 wt% to 96 wt%, 72 wt% to 91 wt%, 73 wt% to 92 wt%, 74 wt% to 93 wt%, 74 wt% to 95 wt%, 76 wt% to 95 wt%, 80 wt% to 90 wt%, 85 wt% to 90 wt%, and so forth, based on the total weight of the composite material. Specifically, the weight of the ceramic material may be 68 wt%, 69 wt%, 70 wt%, 71 wt%, 72 wt%, 73 wt%, 74 wt%, 75 wt%, 76 wt%, 77 wt%, 78 wt%, 79 wt%, 80 wt%, 81 wt%, 82 wt%, 83 wt%, 84 wt%, 85 wt%, 86 wt%, 87 wt%, 88 wt%, 89 wt%, 90 wt%, 91 wt%, 92 wt%, 93 wt%, 94 wt%, 95 wt%, 96 wt%, 97 wt%, 98 wt%, 99 wt%, etc., based on the total weight of the composite material.

In an embodiment of the present invention, in the granulation process of the composite material, the particle size of the ceramic material may be smaller than that of the metal material, so that more ceramic materials having a small particle size can be attached to the metal material having a large particle size. For example, the ceramic material may have a particle size of 1 μm to 10 μm, and here, it is mainly considered that, when the particle size of the ceramic material is less than 1 μm, although the non-tackiness of the non-stick coating can be improved by relatively fine powder, the process cost for manufacturing such powder having a smaller particle size is high, and at the same time, the proportion of powder having a particle size of less than 20 μm in the final granulated powder manufactured using such powder having a smaller particle size is increased, thereby reducing the yield of the granulated powder. When the grain size of the ceramic material is larger than 10 μm, it is necessary to ensure that more ceramic powder adheres to the surface of the metal material if a non-stick coating with sufficient porosity is desired. However, since the grain size of the granulated material is large, higher process costs must be consumed to ensure the above-mentioned demand. On the other hand, the ceramic powder with larger particle size can cause no obvious lotus leaf structure on the surface of the finally formed non-stick coating and can reduce the non-stick property of the non-stick coating.

In an embodiment of the present invention, the ceramic material may have a particle size of 1 μm to 10 μm. For example, the particle size of the ceramic material may be 1 μm to 9 μm, 1 μm to 8 μm, 2 μm to 9 μm, 2 μm to 8 μm, 2 μm to 7 μm, 2 μm to 6 μm, 3 μm to 7 μm, 3 μm to 6 μm, 4 μm to 5 μm, 5 μm to 6 μm, and the like. For example, the particle size of the ceramic material may be 1 μm, 2 μm, 3 μm, 4 μm, 5 μm, 6 μm, 7 μm, 8 μm, 9 μm, 10 μm, or the like.

In an embodiment of the present invention, the metal material included in the composite material may include one or more of titanium, titanium alloy, iron, stainless steel, low-carbon steel, high-carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy.

In an embodiment of the invention, when the composite material comprises a metallic material, the weight of the metallic material is 0 wt% to 30 wt%, based on the total weight of the composite material. Here, it is mainly considered that, when the composite material includes a metal material, when the weight of the metal material is more than 30 wt% based on the total weight of the composite material, since the surface energy of the metal material itself is high, when the proportion of the metal material is high, problems such as poor non-tackiness of the non-stick coating layer finally formed may be caused; when the weight of the metallic material is equal to 0 wt%, the composite material for the non-stick coating comprises only the ceramic material and the binder, and does not comprise the metallic material.

For example, when the composite material includes a metallic material, the weight of the metallic material is 1 wt% to 30 wt%, 1 wt% to 29 wt%, 2 wt% to 28 wt%, 3 wt% to 27 wt%, 4 wt% to 26 wt%, 5 wt% to 25 wt%, 6 wt% to 24 wt%, 7 wt% to 23 wt%, 8 wt% to 22 wt%, 9 wt% to 21 wt%, 10 wt% to 20 wt%, 11 wt% to 19 wt%, 12 wt% to 18 wt%, 13 wt% to 17 wt%, 14 wt% to 16 wt%, and the like, based on the total weight of the composite material. Specifically, when the composite material includes a metal material, the weight of the metal material is 1 wt%, 2 wt%, 3 wt%, 4 wt%, 5 wt%, 6 wt%, 7 wt%, 8 wt%, 9 wt%, 10 wt%, 11 wt%, 12 wt%, 13 wt%, 14 wt%, 15 wt%, 16 wt%, 17 wt%, 18 wt%, 19 wt%, 20 wt%, 21 wt%, 22 wt%, 23 wt%, 24 wt%, 25 wt%, 26 wt%, 27 wt%, 28 wt%, 29 wt%, 30 wt%, etc., based on the total weight of the composite material.

In an embodiment of the present invention, in the granulation process of the composite material, when the composite material includes a metal material, the particle diameter of the metal material may be 10 μm to 80 μm. Here, it is mainly considered that, when the particle size of the metal material is larger than 80 μm, the surface roughness of the finally formed non-stick coating is too large due to the relatively large particle size, which affects the appearance of the final product. When the particle diameter of the metal material is less than 10 μm, since the particle diameter is relatively small, the cost during the grinding process is high, which is not favorable for the process cost control.

In an embodiment of the present invention, when the composite material includes a metal material, the particle size of the metal material may be 10 μm to 80 μm. For example, the particle size of the metal material may be 10 μm to 70 μm, 15 μm to 65 μm, 15 μm to 60 μm, 20 μm to 55 μm, 25 μm to 50 μm, 30 μm to 45 μm, 35 μm to 45 μm, or the like. For example, the particle size of the metal material may be 10 μm, 15 μm, 20 μm, 25 μm, 30 μm, 35 μm, 40 μm, 45 μm, 50 μm, 55 μm, 60 μm, 65 μm, 70 μm, 75 μm, 80 μm, or the like.

In embodiments of the present invention, the binder included in the composite material may include one or more of a cellulose-based binder and an alcohol-based binder. For example, the cellulosic binder may include one or more of hydroxymethyl cellulose, hydroxyethyl cellulose, hydroxypropyl methyl cellulose, and other cellulosic binders. For example, the alcohol binder may include one or more of polyvinyl alcohol, polyacrylic alcohol, and other higher (e.g., greater than 6 carbon atoms) alcohols.

In embodiments of the invention, the binder may be present in an amount of 1 to 2 wt%, based on the total weight of the composite. For example, the weight of the binder may be 1 wt%, 1.5 wt%, or 2 wt%, based on the total weight of the composite. Here, it is mainly considered that, when the weight of the binder is less than 1 wt% based on the total weight of the composite material, since the proportion of the binder is small, granulation cannot be efficiently performed, the effect of increasing the porosity by the binder is insignificant and the initial non-tackiness to the finally formed non-stick material is not significantly increased in the finally formed non-stick coating layer; when the weight of the binder is more than 2 wt%, the binder is in a high proportion, which easily causes the caking phenomenon after the subsequent spray sintering and other processes, thereby causing the problems of the overall production efficiency reduction and the like.

In the embodiment of the present invention, when granulation is performed using a cellulose-based binder, the cellulose-based binder remains in the non-stick coating because it does not volatilize after undergoing cold/thermal spraying or other processes to finally form the non-stick coating, and the porosity of the non-stick coating can be appropriately improved, thereby improving the non-stick property of the non-stick coating.

When the alcohol binder is used for granulation, after the non-stick coating is finally formed through a cold/thermal spraying process (particularly a thermal spraying process) or other processes, the alcohol binder can be volatilized, so that the finally formed non-stick coating has certain porosity, the oil storage effect of the non-stick coating can be improved, and the non-stick property of the non-stick coating is improved.

In an embodiment of the present invention, in the granulation process of the composite material, the particle size of the composite material may be 20 μm to 100 μm. Here, it is mainly considered that when the particle size of the composite material is smaller than 20 μm, the problems of blockage of a powder feeding pipe and the like in a spraying matching device used in a subsequent spraying process are easily caused, and the production is not smooth; when the particle size of the composite material is larger than 100 micrometers, on one hand, the granulation cost is low, the cost is high, and the production control is not facilitated, and on the other hand, larger particles can form a sharp rough structure, so that the finally formed non-stick coating cannot form a lotus leaf structure, and the initial non-stick property is poor.

In an embodiment of the present invention, in the granulation process of the composite material, the particle size of the composite material may be 20 to 100 μm, 20 to 90 μm, 30 to 90 μm, 20 to 80 μm, 30 to 70 μm, 30 to 60 μm, 40 to 50 μm, or the like. Specifically, in the granulation process of the composite material, the particle size of the composite material may be 20 μm, 30 μm, 40 μm, 50 μm, 60 μm, 70 μm, 80 μm, 90 μm, 100 μm, or the like.

Non-stick cookware comprising the above-described composite will be described in detail below with reference to FIG. 1.

FIG. 1 shows a schematic structural view of a non-stick cookware 100 according to one embodiment of the present invention.

As shown in FIG. 1, the non-stick cookware 100 includes a base 120 and a non-stick coating 140 on a surface of the base.

The base 120 may be the body of a non-stick cookware, for example, when the non-stick cookware is a pan, the base may be a pan body. The substrate 120 may be made of any suitable material commonly used in the art. . The substrate 120 may include an inner surface for carrying the article and an outer surface facing away from the inner surface.

The non-stick coating 140 may be located on the inner surface of the substrate 120. The non-stick coating 140 may comprise a composite material as described above, such that the non-stick coating 140 may have improved initial non-stick properties.

It should be understood that the non-stick cookware 100 according to the present invention may also have a common cookware structure such as a cookware handle (e.g., pan handle), with only the body portion of the non-stick cookware illustratively shown in FIG. 1, and the other portions not shown.

The non-stick cookware according to the present invention includes a non-stick coating formed by a composite material, so that the non-stick cookware has improved initial non-stick properties, high hardness and high stability.

In the embodiment of the invention, the composite material can be manufactured by adopting a pulping-spray drying-sintering mode.

A method of manufacturing a composite material according to an embodiment of the present invention will be described below in detail with reference to fig. 2.

Referring to fig. 2, a method of manufacturing a composite material according to an embodiment of the present invention includes forming a composite material by grinding (step S310), pulping (step S320), spray drying (step S330), sintering (step S340), and sieving (step S350).

In step S310, a step of grinding an optional metallic material and a ceramic material is performed. The optional metallic material and ceramic material are subjected to a milling process to obtain a metallic powder having a particle size of 10 to 80 μm and a ceramic powder having a particle size of 1 to 10 μm. The method of the grinding process may adopt any existing techniques, and the present invention is not limited thereto.

In step S320, a pulping step is performed. Specifically, the pulping step includes preparing a mixed liquid (step S321) and mixing (step S322).

In step S321, the binder and the auxiliary agent are dissolved in water to obtain a mixed solution. Specifically, 1 to 4% by weight of a binder, 0.5 to 1% by weight of a dispersant, and 1 to 2% by weight of a defoaming agent are mixed in deionized water to prepare a mixed solution. Here, the dispersant functions to better disperse the solid powder added to the mixed solution and to make it more uniform in the spray granulation process. The defoaming agent has the effects of reducing the generation of binder foam, avoiding the waste of the binder and ensuring that the final granulation is more accurate.

In the mixing liquid step, the weight of the dispersant and the defoamer is proportional to the weight of the binder, based on the total weight of the mixed solution. That is, the higher the weight of the binder, the higher the weight of the dispersant and the defoaming agent, based on the total weight of the mixed solution. When the binder is less than 1% by weight based on the total weight of the mixed solution, the ceramic material cannot be effectively coated due to the small weight of the binder; and when the binder is more than 4% by weight, agglomeration is easily caused in a spraying and sintering process to be described later due to a relatively high weight ratio of the binder, thereby causing a problem of lowering production efficiency.

In step 322, the optional metal powder and ceramic powder milled in step 310 are mixed with the mixed liquid prepared in step 321 as described above. A slurry with a solids content of 20 to 70 wt% based on the total weight of the slurry is finally obtained. Here, it is mainly considered that, when the solid content of the slurry is less than 20 wt% based on the total weight of the slurry, the process cost is too high due to the long granulation time; when the solid content of the slurry is more than 70 wt%, the solid content is high, and the liquid content in the slurry is low, so that the subsequent spraying process cannot be stably carried out, and the production stability is influenced.

In step S330, a spray drying step is performed. The slurry produced in step 320 is transferred to a high speed slinger disc at 6000 to 15000 rpm (preferably 6000 to 12000 rpm) to form droplets. Subsequently, the droplets are blown into a drying tower of 100 ℃ to 400 ℃ by hot air of 60 ℃ to 100 ℃. During the descending of the liquid drop, after 5 to 15 seconds of stay, spherical and solid powder is formed. Here, the lower temperature hot air can reduce the loss of the binder, so that more binder remains in the granulated powder. Meanwhile, the initial particle size of the granulated powder is small, and the whole particle size of the granulated powder formed after the binder is adhered is also relatively small, so that the granulated powder can be thrown out only at a relatively low rotating speed, and the process cost is saved.

In step 340, a sintering step is performed. The granulated powder manufactured in step 330 is sintered to a predetermined temperature to remove moisture in the granulated powder. In performing the sintering step, a sintering curve may be formulated to sinter to a predetermined temperature according to physical properties of the granulated powder raw material. For example, the predetermined temperature may be 95 ℃, 100 ℃, 120 ℃, 150 ℃, or the like. The heating rate of the sintering may be 5 to 10 ℃/min, and the holding time of the sintering process may be 3 to 10 hours. Since the initial particle size of the granulated powder is small and the overall particle size of the granulated powder formed after the binder is adhered is also relatively small, the sintering process can be completed with only a relatively low temperature rise rate and a relatively short holding time, so that the process cost can be saved.

In step 350, a screening step is performed. The granulated powder produced in step 340 is sieved and sieved into powders of different particle size intervals according to the process production requirements. In the finally produced granulated powder, a particle + binder structure may be formed. In the particle + binder configuration, the particles may be one or more particles, and thus, the resulting granulated powder has a larger particle size than the original powder.

According to an embodiment of the present invention, in the final granulated powder particle (i.e., composite material), the surface thereof has more pores. Thus, the granulated powder used to form the non-stick coating has a certain porosity by itself, and the final non-stick coating formed by the granulated powder also has a certain porosity. The porosity can provide good oil storage effect for the non-stick coating, achieve the non-stick characteristic of oil storage, and further improve the initial non-stick property of the non-stick coating.

By coating the composite material on the surface of the non-stick pan, the finally formed non-stick pan can have improved initial non-stick property, and the effects of stable material, high hardness, high temperature resistance, long non-stick service life and the like are achieved.

The composite material of the present invention and the method for manufacturing the composite material will be described in detail below with reference to examples and comparative examples.

Example 1

Putting titanium oxide as ceramic material into a ball mill, grinding at 1000r/min and 2:1 under the protection of nitrogen for 22 hr, and vacuum degree of 5 × 10^-3Pa and a temperature of 150 ℃ for 2 hours to obtain a powder having a particle size of 5 μm.

A mixed solution was prepared by dissolving 2 wt% of hydroxymethyl cellulose, 0.7 wt% of citric acid, and 1.5 wt% of polyether-modified silicone oil in water. The ground titanium oxide powder was mixed with the above mixed solution to obtain a composite slurry having a solid content of about 50 wt%.

Then, the composite slurry was conveyed to a high-speed liquid-throwing disk at 8000 rpm to form liquid droplets, and the liquid droplets were blown into a drying tower at 250 ℃ with hot air at 60 ℃. During the descent of the droplets, a 5 second dwell was passed to form a spherical and solid powder.

Sintering the prepared spherical and solid powder. And (3) establishing a sintering curve according to the physical properties of the titanium oxide, wherein the temperature of the powder is raised to 150 ℃ at a temperature raising speed of 5 ℃/minute, and then the powder is kept for 7 hours to remove water in the composite material slurry.

And finally, carrying out a screening process to obtain the composite material. In the composite material, the binder accounts for 1.8 percent, and the balance is titanium oxide;

the composite material is sprayed on the surface of the pan body through a thermal spraying process to form a non-stick coating with the thickness of 70 mu m.

Furthermore, as can be seen from the SEM picture of fig. 3, in the final granulated powder particle (i.e., composite material), the surface thereof has more pores and binders, and thus, the composite material itself has a certain porosity.

Example 2

The difference from the embodiment 1 is that,the particle size of the titanium oxide was 9 μm.

Example 3

The difference from the embodiment 1 is that,titanium oxide as a ceramic material and optionally a metallic material The aluminum alloy was ball-milled to obtain titanium oxide powder having a particle size of 5 μm and aluminum alloy powder having a particle size of 40 μm. And (2) mixing the components in a mass ratio of 4: the titanium oxide powder and the aluminum alloy powder of 1 are mixed with the mixed liquid to perform the subsequent process.

Example 4

The difference from the embodiment 3 is that,titanium oxide powder and aluminum alloyThe mass ratio of the gold powder was 9: 1.

Example 5

The difference from the embodiment 3 is that,the mass ratio of the titanium oxide powder to the aluminum alloy powder was 7: 3.

Example 6

The difference from the embodiment 3 is that,the grain size of the aluminum alloy was 75 μm.

Example 7

The difference from the embodiment 3 is that,the grain size of the aluminum alloy is 25 μm.

Comparative example 1

The difference from the embodiment 1 is that,the particle size of the titanium oxide was 12 μm.

Comparative example 2

The difference from the embodiment 3 is that,the mass ratio of the titanium oxide powder to the aluminum alloy powder was 2: 1.

Comparative example 3

The difference from the embodiment 5 is that,the grain size of the aluminum alloy is 100 μm.

Comparative example 4

The non-stick cookware is manufactured by directly using the conventional fluororesin as the non-stick coating.

Measurement of initial tack-free and tack-free durability

Specifically, the test method is as follows:

(1) test method for initial tack free: the non-stickiness test method of the fried egg in GB/T32095.2-2015 is an initial non-stickiness test, and the test result is divided into I, II and III grades, wherein the non-stickiness of the I grade is the best, and the non-stickiness of the III grade is the worst.

(2) Non-stick durability test method: the test unit of the durable non-stick property test method in GB/T32388-2015 is times, and the higher the times, the better the non-stick durability, namely the longer the service life of the non-stick cookware.

Where the tack-free durability was tested, the number of times until the tack-free reached grade III was recorded.

Examples of the invention	Initial non-tackiness	Non-stick durability (second)
			Example 1	Ⅰ	45000
Example 2	Ⅰ	35000
			Example 3	Ⅰ	37000
Example 4	Ⅰ	42000
			Example 5	Ⅱ	27000
Example 6	Ⅱ	31000
			Example 7	Ⅰ	40000
Comparative example 1	Ⅱ	6000
			Comparative example 2	Ⅲ	0
Comparative example 3	Ⅲ	0
			Comparative example 4	Ⅰ	8000

Generally, a non-stick cookware is considered to have improved non-stick properties when the non-stick coating has an initial non-stick property of class II or above and a non-stick durability of the non-stick coating of 10000 times or above.

As can be seen from the data in table 1, the non-stick coatings of examples 1 to 7 according to the invention have improved non-stick properties compared to comparative examples 1 to 4.

In summary, according to the embodiments of the present invention, since the composite material for the non-stick coating may include the optional metal material, the ceramic material and the binder, the initial non-stick property and the non-stick durability of the non-stick coating are improved, and the effects of stable material, long non-stick life and the like are achieved.

The invention produces a non-stick coating with optimized properties by a rational optimization of the composition of the composite material for the non-stick coating. The non-stick cooker manufactured by using the composite material realizes multiple performances such as shovel resistance, lasting non-stick performance and the like, so that the user experience is greatly improved.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it will be understood by those of ordinary skill in the art that various changes in form and details may be made therein without departing from the spirit and scope of the present invention as defined by the following claims and their equivalents. The embodiments should be considered in descriptive sense only and not for purposes of limitation. Therefore, the scope of the invention is defined not by the detailed description of the invention but by the appended claims, and all differences within the scope will be construed as being included in the present invention.

Claims

1. A composite material for non-stick cookware, the composite material comprising, based on the total weight of the composite material: 68 to 99 wt% of a ceramic material, 0 to 30 wt% of a metallic material and 1 to 2 wt% of a binder,

wherein the ceramic material comprises one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, ferric oxide, ferrous oxide, aluminum oxide, chromium oxide and nickel oxide.

2. The composite of claim 1, wherein the metallic material comprises one or more of titanium, titanium alloy, iron, stainless steel, low carbon steel, high carbon steel, cast iron, copper alloy, aluminum alloy, nickel, and nickel alloy;

the binder includes one or more of a cellulose-based binder and an alcohol-based binder.

3. The composite of claim 2, wherein the cellulosic binder comprises one or more of hydroxymethyl cellulose, hydroxyethyl cellulose, and hydroxypropyl methyl cellulose;

the alcohol binder includes one or more of polyvinyl alcohol and polyallyl alcohol.

4. The composite material according to claim 1, wherein the content of the metal material is 1 to 30 wt% based on the total weight of the composite material, and

the particle size of the ceramic material is smaller than that of the metal material.

5. A method of making a composite material for non-stick cookware, the method comprising the steps of:

dissolving a binder and an auxiliary agent in water to obtain a mixed solution;

adding a ceramic material and an optional metal material into the mixed solution to obtain mixed slurry;

spray-drying and sintering the mixed slurry to obtain the composite material,

wherein the composite material comprises, based on the total weight of the composite material: 68 wt% to 99 wt% of a ceramic material comprising one or more of titanium oxide, titanium nitride, titanium carbide, ferroferric oxide, iron oxide, ferrous oxide, aluminum oxide, chromium oxide, and nickel oxide, 0 wt% to 30 wt% of a metallic material, and 1 wt% to 2 wt% of a binder.

6. The method of claim 5, wherein the adjuvant comprises one or more of a dispersant and a defoamer;

the dispersant comprises one or more of citric acid and triethylhexylphosphoric acid;

the defoaming agent includes one or more of polyether-modified silicone oil and silicone oil.

7. The method of claim 6, wherein the adjuvant comprises a combination of a dispersant and an antifoaming agent, and

the content of the dispersant is 0.5 to 1 wt% and the content of the antifoaming agent is 1 to 2 wt%, based on the total weight of the mixed slurry.

8. The method according to claim 5, wherein the step of spray drying is performed at a rotational speed of 6000 to 15000 revolutions per minute and at a temperature of 100 to 400 ℃;

and a step of heating to a predetermined temperature at a heating rate of 5 to 10 ℃/min and then holding for 3 to 10 hours to remove water in the mixed slurry to perform sintering.

9. The method of claim 5, further comprising: grinding the ceramic material and the metal material prior to the step of adding the ceramic material and the optional metal material to the mixed solution, wherein the grain size of the ground ceramic material is smaller than the grain size of the ground metal material.

10. A non-stick cookware, comprising:

a substrate comprising an inner surface for carrying an article and an outer surface facing away from the inner surface; and

a non-stick coating disposed on said inner surface of said substrate and comprising a composite material according to any one of claims 1 to 4.