WO2019014976A1

WO2019014976A1 - Use of polysilazane as coating on cooking utensil

Info

Publication number: WO2019014976A1
Application number: PCT/CN2017/095993
Authority: WO
Inventors: 伍尚华; 刘炳耀; 欧剑华
Original assignee: 广东工业大学; 广东万事泰集团有限公司
Priority date: 2017-07-20
Filing date: 2017-08-04
Publication date: 2019-01-24
Also published as: CN107307745A

Abstract

Provided is the use of a polysilazane as a coating on a cooking utensil, wherein the polysilazane is applied on the internal and/or external surfaces of the cooking utensil as one or more of non-stick coatings, water and oil repellency coatings, scratch resistant coatings, high temperature resistant coatings and stain resistant coatings. The formed polysilazane coating is transparent, thus the coated cooking utensil not only has good aesthetics and safety, but also has excellent performance, and also extremely strong heat resistance wherein the maximum heat-resistance temperature can be up to 1800ºC, which is safe during use. The polysilazane coating has an ultra-high hardness which can reach 9H+, and has strong scratch resistant and stain repellent abilities, is easily cleaned and has excellent corrosion resistance properties; a coated pot cover has hydrophobicity and lipophobicity, such that the cooking of food in a pot can be better observed. The method for applying a polysilazane to a cooking utensil is simple and easy to operate, and can omit a sandblasting procedure of conventional coating methods, which improves the production efficiency and also reduces the environmental pollution and sound problems resulting from the sandblasting procedure.

Description

Application of polysilazane as coating on cookware

Technical field

The invention belongs to the field of application of polysilazane on cookware, and particularly relates to the application of polysilazane on the inner and/or outer surface of the cookware as a non-stick coating, a hydrophobic oleophobic coating, and a scratch-resistant coating. One or more of a layer, a high temperature resistant coating, and a stain resistant coating.

Background technique

Pots made of metal materials such as cast iron and stainless steel are common cooking tools in life, but they are prone to sticking and scorching during use, which not only affects the taste of the food being cooked, but also produces some health benefits. Unfavorable substances, the food sticking to the pot also brings great inconvenience to the cleaning of the pot.

In the market, the common non-stick coating material is PTFE, but the strength of PTFE is not enough, it is easy to peel off and damage, so it is not recommended to use shovel for cooking during cooking, but even if you do not use shovel Cooking, after a period of use, the Teflon coating is also easy to peel off and damage, which greatly affects the life of the pan. In addition, the heat resistance of polytetrafluoroethylene is poor, and the general use temperature cannot exceed 250 ° C. After a period of use, the polytetrafluoroethylene coating is easily damaged by high temperature. In addition, PTFE contains fluorine, and there is some controversy about whether there is a hidden danger to human health during the use of non-stick pan.

There are also some non-stick coatings that are not fluorine-containing, but these non-fluorinated non-stick coatings do not really solve the problem of non-stickiness. Therefore, no matter whether the fluorine-containing non-stick coating or the fluorine-free non-stick coating, the problem of non-stickiness and safety can be truly solved. However, the applicant unexpectedly discovered that the new material of polysilazane can solve these problems. Applying polysilazane to the pot can make the pot have non-stick properties, and the polysilazane also has high temperature resistance. It is resistant to scratches and will not fall off, and truly solves the problem of non-stick and safety of the pan.

In addition, some fumes will be produced in the kitchen, and the cookware placed in the kitchen will easily fall into the soot, and these soot cleaning is more difficult, resulting in a relatively heavy cleaning work. Applicants have unexpectedly discovered that the application of a new material such as polysilazane to the surface of the cookware can improve the stain resistance of the cookware and greatly reduce the cleaning of the kitchen.

Although there are various reports on the use of polysilazane as a coating, generally, polysilazane is used as a ceramic coating, a heat-resistant coating, etc., and no reports have been found about polysilazane as a non-stick material, nor A report on the application of polysilazane as a non-stick material to a non-stick pan was found.

Therefore, the applicant accidentally discovered this property of polysilazane, and first proposed the application of polysilazane in cookware, especially the application of polysilazane in non-stick pan, giving the cookware a non-stick, hydrophobic Sparse, scratch resistance and stain resistance greatly improve the life and self-cleaning ability of the cookware, providing a new material for non-stick coating of non-stick pan.

Summary of the invention

The invention provides the application of polysilazane, in particular the application of polysilazane in a non-stick pan, coating polysilazane on As a non-stick coating on the non-stick pan, it can make the non-stick pan truly achieve non-stick performance, and also ensure the safety of the use process; the polysilazane is applied as a coating on other cookware, and can also be used as Hydrophobic oleophobic coatings, scratch-resistant coatings, high-temperature coatings and stain-resistant coatings give the cookware the ability to be hydrophobic, scratch-resistant and stain-resistant.

The technical solution adopted by the invention is: a polysilazane application, the polysilazane is applied as a coating on a cookware, in particular, the polysilazane is applied as a non-stick coating in a pot The polysilazane is applied to the lid as a hydrophobic oleophobic coating.

Preferably, the cookware comprises a pot body, a lid, a spatula, a spoon, a gas cooker, a cutter, a knife holder, and the like. The cookware may include various cookware used in the kitchen, such as various pots and lids, such as pots and lids of rice cookers, pots and lids of pressure cookers, frying pans, woks, etc., various shovels and Spoons, such as colanders, soup spoons, rice spoons, etc.; knives and tool holders, such as fruit knives, kitchen knives and other commonly used tools.

The polysilazane is applied to the pot body to form a non-stick coating on the pot body, which can make the pot body have non-stick property, improve the safety and convenience of the pot body, and can also make the pot The body has the characteristics of high heat resistance temperature, high strength, scratch resistance and high adhesion, which greatly improves the quality and service life of the pot body.

The polysilazane is applied to the lid of the pot to form a hydrophobic oleophobic coating on the lid, which can disperse the water vapor formed during the cooking process, thereby better observing the cooking condition of the food in the pot.

The polysilazane is coated on other cookware to form a polysilazane coating on the surface of the cookware, thereby imparting hydrophobic oleophobic, scratch and stain resistance to the cookware, improving the scratch resistance and self-cleaning of the cookware. ability.

Preferably, the cookware is made of glass, stainless steel, aluminum alloy or cast iron. The polysilazane can be applied to various common cookware, and the cookware material is preferably glass, stainless steel, aluminum alloy and cast iron, but those skilled in the art can apply polysilazane to cookware of various materials according to the actual situation. The surface gives the cookware a new level of performance.

Preferably, the polysilazane is applied to the cookware as one or more of a non-stick coating, a hydrophobic oleophobic coating, a scratch resistant coating, a high temperature resistant coating, and a stain resistant coating.

Polysilazane can be applied to cookware as a variety of coatings, giving the cookware various excellent properties and improving the quality of the cookware.

Preferably, the polysilazane coating has a thickness of from 20 to 60 um. The polysilazane coating can be adjusted according to actual needs. For example, the polysilazane coating can have a thickness of 20-50 um, and the polysilazane coating can have a thickness of 20-40 um, polysilazane coated. The thickness may be 30-50 um, and the thickness of the polysilazane coating may be 20-40 um.

The invention also provides a method for applying polysilazane to a cookware, comprising the following steps:

1) Cleaning: Wash the cookware and then dry it;

2) coating: coating polysilazane on the surface of the cleaned cookware;

3) Curing: The coated cookware is cured and then a coating is formed on the surface of the cookware.

Preferably, a polishing step is further included before the washing step for polishing the surface of the cookware to smooth the surface of the cookware.

Since the polysilazane has a strong adhesion and does not require a certain roughness of the inner surface of the cooker to be coated, the sanding process in the conventional coating method can be omitted, and the labor can be reduced to further improve. Production efficiency can also reduce environmental pollution problems caused by the sanding process.

The polishing step may also be included before the cleaning step, and a person skilled in the art may add a polishing step before the cleaning step for polishing the surface of the cookware to make the surface of the cookware smooth and flat, so that the cookware is more beautiful.

Preferably, in step 3), when the polysilazane is coated, the coating means employed includes spraying, wiping, vibrating, and roller coating.

Preferably, in step 4), the means of curing comprises natural curing and sintering curing. Those skilled in the art can select a suitable curing method according to actual needs, such as the time of curing and the material of the cookware. For example, when the lid is a glass lid, the curing step in the coating method used may be a natural curing method, and the coating method is briefly described as follows: the glass lid is cleaned and dried, and the polysilazane is used. It is applied to a glass lid and cured at room temperature to form a lid with a coated polysilazane coating.

Preferably, in step 4), the natural curing temperature is 20-35 ° C, the time is 36-60 h; the sintering curing temperature is 100-450 ° C, and the sintering curing time is 10-120 min.

Preferably, the natural curing is carried out at a normal temperature, the natural curing time is 48 h; the sintering curing temperature is 100-150 ° C, the time is 1-2 h; the sintering curing temperature is 150-200 ° C, the time is 40-60 min; sintering The curing temperature is 250-300 ° C, the time is 20-30 min; the sintering curing temperature is 300-400 ° C, the time is 15-20 min; the sintering curing temperature is 400-450 ° C, and the time is 10-15 min.

Coating is an important process, so the coating shop must be a clean room, and the coating applied to the pan must be uniform to give the pan a good performance. In the present application, the sprayed coating is a polysilazane liquid resin, which is a polymer which alternates between silicon and nitrogen atoms to form a basic skeleton for ceramics, metals, glass and most organic materials. It has excellent adhesion, high hardness and excellent heat resistance. Therefore, the pot coated with the polysilazane coating has the advantages of high heat resistance temperature, high strength, scratch resistance, high adhesion, etc., and also has non-stick properties, improving the convenience and safety of the use process. .

In addition, the coating of the pot after the application of the polysilazane is transparent and flat, and is not only aesthetically pleasing but also excellent in performance. Since the conventional non-stick non-stick coating is black, in the present application, the coated polysilazane coating is transparent, not only has non-stick properties, but also has a smooth appearance and can be clearly seen. The metallic luster of the pot provides an aesthetic and safety.

In particular, the present invention proposes to apply polysilazane to a non-stick pan. Since polysilazane has the advantages of non-stickiness, high heat resistance temperature, high strength, scratch resistance, high adhesion, etc., it is coated on In the pot body, the pot body can be imparted with non-sticking and scratch resistance. The polysilazane is applied to the inner surface of the lid, and since the polysilazane is hydrophobic and oleophobic, it can be shaped during cooking. The water vapor is dispersed around, which can better observe the cooking of the food in the pot. Therefore, in actual production, polysilazane can be applied to the pot body and/or the lid as needed.

The invention applies polysilazane to a cookware, and the polysilazane has the following structural formula:

[R1R2Si-NR3] _n ,

Wherein R1, R2 and R3 may be the same or different and may be hydrogen, alkyl, aryl or vinyl; the alkyl group may be methyl, ethyl, propyl, isopropyl, n-butyl or isopropyl Base, n-butyl or sec-butyl; the aryl group is phenyl or o-tolyl. n is a value such that the average molecular weight of the polysilazane is from 300 to 80,000 g/mol, and more preferably, n is a value such that the polysilazane has an average molecular weight of from 1,000 to 30,000 g/mol.

Preferably, the polysilazane is a perhydropolysilazane.

Polysilazane is an inorganic polymer in which a main chain has a Si-N bond as a repeating unit. Polysilazane has ultra-high hardness, hardness up to 9H+, and has excellent heat resistance. The highest heat-resistant temperature can reach 1800 °C. When polysilazane is heated to a minimum of 450 °C, the polymer will eventually be converted into inorganic. Ceramic (SiOx), inorganic ceramics have extremely high hardness (9H) and high heat resistance (up to 1800 °C). Polysilazane has excellent adhesion to ceramics, metals, glass and most organic materials. When polysilazane is used as a coating, it can be made into a low surface energy, which can be used as antifouling, easy to clean and easy to take off. Mold coating. In addition, polysilazane also has excellent corrosion resistance. According to ISO7253, the aluminum coated with organopolysilazane coating is still non-corrosive after 2400 hours of salt spray test. According to ISO 6270, the organopolysilazane coating is applied. The steel still has no corrosion after 2400 hours of condensate testing.

When the organopolysilazane is heated to a minimum of 450 ° C, the polymer will eventually be converted to inorganic ceramic SiOx. Inorganic ceramics have extremely high hardness (9H+) and ultra high heat resistance (1800 °C). Therefore, polysilazane is widely used in varnish formulations to provide excellent weather resistance, UV resistance, corrosion resistance, stain resistance, scratch resistance and heat resistance.

Organic polysilazane materials are comparable to traditional filming used in the coatings industry in a wide range of applications and offer significant performance advantages in certain areas. The coating system for organic polysilazane applications exhibits excellent performance, long life and excellent adhesion to the substrate.

The application of polysilazane has excellent properties and can be applied in various fields, such as: 1) industrial coatings; 2) binders, used as binders for ceramics, metals, glass, organic materials; 3) used as Ceramic prepolymers, such as ceramic binders, ceramic matrix composites, metal matrix composites and ceramic fibers; 4) composites and coatings such as polyurethane, silicone, epoxy and acrylic.

Polysilazane can be divided into organopolysilazane (OPSZ) and inorganic polysilazane (PHPS). When a silicon atom is bonded to a hydrocarbon substituent, it is called an organopolysilazane; when all the substituents are As a hydrogen atom, the polymer is called inorganic polysilazane (PHPS). The invention can be used either organic polysilazane (OPSZ) or inorganic polysilazane (PHPS). Different types of polysilazane are selected depending on the specific choice of coating required. Among them, the main performance comparison between organopolysilazane and inorganic polysilazane is shown in the following table:

The invention has the beneficial effects that the invention proposes to apply polysilazane as a coating on a cookware, and since the coated polysilazane has excellent properties, the coated pot body has strong heat resistance. Sex, the highest heat-resistant temperature up to 1800 ° C, safe to use; with ultra-high hardness, hardness up to 9H +, scratch resistance, so avoid the use of shovel to leave scratches when cooking; has excellent adhesion, pot body After long-term use, it will not cause peeling and peeling of the coating, which greatly prolongs the service life of the pot; the coated pot has strong anti-fouling ability, excellent self-cleaning ability, easy cleaning, and excellent Anti-corrosion performance, no corrosion after 2400 hours salt spray test, no corrosion after 2400 hours of condensed water test; coated polysilazane coating is transparent, so the coated pot It not only has aesthetics, safety and excellent performance; the coated lid has hydrophobicity and oleophobicity, which can make the water vapor formed during cooking disperse around, which can better observe the cooking of the food in the pot. Situation; coating polysilazane on other cookware can impart hydrophobicity, scratch resistance and stain resistance to the cookware, improve the scratch resistance and self-cleaning ability of the cookware; apply polysilazane to the cookware The method is simple and easy to operate, and the sanding process of the conventional coating method can be omitted, the labor can be reduced to further improve the production efficiency, and the environmental pollution problem and the noise problem caused by the sanding process can be reduced.

Detailed ways

The polysilazane used in the present invention may be a polysilazane supplied by Merck or Anzhi.

Example 1

This embodiment is to apply polysilazane to a stainless steel pot.

The polysilazane is applied as a non-stick coating on a stainless steel pot, and the method of applying the polysilazane to the pot includes the following steps:

1) Polishing: polishing the inner surface of the stainless steel pot to make the inner surface smooth and flat;

2) Cleaning: clean the stainless steel pot with pure water or deionized water, and then dry;

2) coating: spraying polysilazane on the inner surface of the cleaned stainless steel pot body, the thickness of the sprayed coating is 20 um;

3) Curing: The sprayed stainless steel pot was sintered in a high temperature furnace at a temperature of 100 ° C for 2 h to form a non-stick coating on the inner surface of the stainless steel pot.

Example 2

This embodiment is to apply polysilazane to an aluminum alloy pot.

The polysilazane is applied as a non-stick coating on an aluminum alloy pot, and the method of applying polysilazane to the pot includes the following steps:

1) Polishing: polishing the inner surface of the aluminum alloy pot to make the inner surface smooth and flat;

2) Cleaning: clean the aluminum alloy pot with pure water or deionized water, and then dry;

3) coating: the polysilazane is rubbed on the surface of the cleaned aluminum alloy pot body, the coating thickness is 25um;

4) Curing: The aluminum alloy pot body after rubbing the polysilazane is placed at a normal temperature of 25 ° C for 48 hours to form a non-stick coating on the surface of the aluminum alloy pot body.

Example 3

This embodiment is to apply polysilazane to a cast iron pot.

The polysilazane is applied as a non-stick coating on a cast iron pot, and the method of applying the polysilazane to the pot includes the following steps:

1) Polishing: polishing the inner surface of the cast iron pot to make the inner surface smooth and flat;

2) Cleaning: clean the cast iron pot with pure water or deionized water, and then dry;

3) coating: the polysilazane is sprayed on the surface of the cleaned cast iron pot, the coating thickness is 30um;

4) Curing: The cast iron pot body after wiping the polysilazane was sintered in a high temperature furnace at a temperature of 180 ° C for 40 min to form a non-stick coating on the inner surface of the cast iron pot.

Example 4

This embodiment is to apply polysilazane to a stainless steel pot.

3) coating: the polysilazane is sprayed on the surface of the cleaned stainless steel pot body, the coating thickness is 40um;

4) Curing: The stainless steel pot after rolling the polysilazane is sintered in a high temperature furnace at a temperature of 250 ° C for 25 min, from A non-stick coating is formed on the inner surface of the stainless steel pot.

Example 5

This embodiment is to apply polysilazane to an aluminum alloy pot.

3) coating: the polysilazane is sprayed on the surface of the cleaned aluminum alloy pot body, the coating thickness is 50um;

4) Curing: The aluminum alloy pot body after rolling the polysilazane was sintered in a high temperature furnace at a temperature of 350 ° C for 15 minutes to form a non-stick coating on the inner surface of the aluminum alloy pot.

Example 6

This embodiment is to apply polysilazane to a glass lid.

The polysilazane is applied as a hydrophobic oleophobic coating on a glass lid, and the method of applying polysilazane to a glass lid comprises the following steps:

1) Polishing: polishing the inner surface of the glass lid to make the inner surface smooth and flat;

2) Cleaning: clean the glass lid with pure water or deionized water, and then dry;

3) coating: spraying polysilazane on the surface of the cleaned glass lid, the thickness of the sprayed coating is 20um;

4) Curing: The lid of the sprayed polysilazane was naturally cured at room temperature for 60 hours to form a hydrophobic oleophobic coating on the inner surface of the glass lid.

Example 7

This embodiment is to apply polysilazane to a spatula.

The method of applying polysilazane to a spatula includes the following steps:

1) Polishing: polishing the surface of the spatula to make the surface smooth and flat;

2) Cleaning: Wash the spatula with pure water or deionized water, and then dry;

3) coating: spraying polysilazane on the surface of the cleaned spatula, the thickness of the sprayed coating is 30um;

4) Curing: The spatula after spraying the polysilazane was naturally cured at room temperature for 60 hours or placed in a high temperature furnace at a temperature of 350 ° C for 15 minutes to form a polysilazane coating on the inner surface of the spatula.

The polysilazane coating has the properties of hydrophobic oleophobic coating, scratch resistance, non-sticking and the like.

Example 8

This example is the application of polysilazane to a spoon.

The method of applying polysilazane to the spoon was the same as that of Example 7.

The polysilazane coating has the properties of hydrophobic oleophobic coating, scratch resistance, self-cleaning and the like.

Example 9

This embodiment is to apply polysilazane to a gas stove.

The method of applying polysilazane to a gas cooker is the same as that of the method of Example 7.

Example 10

This embodiment is a use effect of a non-stick pan coated with polysilazane.

The non-stick pan coated with polysilazane produced by the present invention was distributed to 150 households as an experience, and 150 households respectively used the non-stick pan for various cooking. After use, it was found that the cooking process was not sticky. The phenomenon occurs, and the good flavor of the cooked food can be maintained, and after one year of use, the polysilazane coating does not fall off and scratches.

The pot body coated by the method of Examples 1-5 not only has non-stick properties, but also has a high heat resistance temperature.

The characteristics of high strength, scratch resistance, self-cleaning ability and high adhesion greatly extend the performance and service life of the pot body. The lid prepared in the example has hydrophobicity and oleophobicity, and is convenient for observing the cooking condition of the food in the pot. The various cookwares prepared in Examples 7-9 have excellent properties such as hydrophobic oleophobic coating, scratch resistance, self-cleaning and the like. All kinds of pots produced can meet the requirements of LGA test, EN_12938 dry burn test, LFGB test, FDA test and salt spray test.

The polysilazane-coated pots prepared in Examples 1-5 were tested for performance, and the results are shown in the following table.

Claims

A use of polysilazane, characterized in that the polysilazane is applied as a coating on a cookware.
The use of polysilazane according to claim 1, wherein the cookware comprises a pot body, a lid, a spatula, a spoon, a gas cooker, a cutter and a tool holder.
The use of polysilazane according to claim 1, characterized in that the material of the cookware is glass, stainless steel, aluminum alloy or cast iron.
The use of polysilazane according to claim 1, wherein the polysilazane is applied to a cookware as a non-stick coating, a hydrophobic oleophobic coating, a scratch resistant coating, a high temperature resistant coating, and One or more of the stain resistant coatings.
The use of polysilazane according to claim 1 wherein the polysilazane coating has a thickness of from 20 to 60 um.
A method for applying polysilazane to a cookware, comprising the steps of:

1) Cleaning: Wash the cookware and then dry it;

2) coating: coating polysilazane on the surface of the cleaned cookware;

3) Curing: The coated cookware is cured and then a coating is formed on the surface of the cookware.
The application method according to claim 6, further comprising a polishing step for polishing the surface of the cookware to smooth and smooth the surface of the cookware.
The application method according to claim 6, wherein in the step 3), when the polysilazane is coated, the coating method used includes spraying, wiping, vibrating and rolling.
The application method according to claim 6, wherein in the step 4), the curing means comprises natural curing and sintering curing.
The application method according to claim 9, wherein in the step 4), the natural curing temperature is 20-35 ° C, the time is 36-60 h; the sintering curing temperature is 100-450 ° C, and the sintering curing time is 10-120min.