COOKING UTENSIL AND METHOD FOR MANUFACTURING THEREOF

Abstract

The present disclosure provides a cooking utensil, comprising a blank of the cooking utensil, and a non-stick layer coated on the surface of the blank; the non-stick layer comprises a primer layer in contact with one side of the blank, and a sheet-like graphene, a sheet-like graphene derivative or a combination thereof uniformly distributed in the primer layer. The present disclosure also provides a method for manufacturing of the cooking utensil. The present disclosure fully realizes the heat conduction between the blank and the food through the sheet-like graphene, the sheet-like graphene derivative or the combination thereof, and effectively improves the heating speed and the heating uniformity.

Claims

1. A cooking utensil comprising: a blank of the cooking utensil, and a non-stick layer coated on a surface of the blank; wherein the non-stick layer comprises a primer layer in contact with one side of the blank, and a sheet-like graphene, a sheet-like graphene derivative or a combination thereof uniformly distributed in the primer layer.

2. The cooking utensil as claimed in claim 1, wherein the mass fraction of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in a water-based paint used to form the primer layer is 28% to 32%.

3. The cooking utensil as claimed in claim 1, wherein a side of the blank facing the non-stick layer has a uniformly rough structure having a roughness ranging from 3 μm to 5 μm.

4. The cooking utensil as claimed in claim 1, wherein a radial width of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof is ranging from 5 μm to 20 μm.

5. The cooking utensil as claimed in claim 1, wherein a thickness of the non-stick layer is ranging from 50 μm to 60 μm.

6. A method for manufacturing of the cooking utensil as claimed in the claim 1, comprising steps of: S10: roughening the surface of the blank of the cooking utensil, then proceeding to step S20; S20: spraying a water-based paint containing the sheet-like graphene, the sheet-like graphene derivative or the combination thereof that forms the primer layer on the surface of the blank, then spraying a sealing layer on the undried surface of the primer layer, and baking, and then proceeding to step S30; and S30: spraying a medium oil layer and a surface oil layer on a surface of the sealing layer in sequence, and then performing firing to obtain a cooking utensil with the non-stick layer.

7. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the step S10 further comprises a cleaning step and a drying step that after finishing the step of roughening the surface of the blank of the cooking utensil, firstly performing alkaline cleaning at 35° C. to 45° C., then carry out two rounds of washing with water at room temperature, then carrying out acid cleaning at room temperature, then carrying out washing with water at room temperature, and then carrying out washing with pure water at room temperature, and finally drying at 150° C.

8. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the baking described in the step S20 is baking at a temperature ranging from 150° C. to 180° C. for 3 minutes to 5 minutes.

9. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the firing described in the step S30 is firing at a temperature of 430° C. for 3 minutes to 5 minutes.

10. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the step S10 is roughening the surface of the blank of the cooking utensil by sandblasting, and the surface roughness of the blank is 3 μm to 5 μm.

11. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the sealing layer is formed by 10% polyethersulfone resin and 5% polyamide-imide resin, which are closely combined with polytetrafluoroethylene resin at 150° C. to 180° C., and the mass fraction is 20% to 22%.

12. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the medium oil layer is formed by filling a material containing 3% to 5% of silicon carbide uniformly into 30% to 55% of fluoropolymer resin at a temperature of 430° C.

13. The method for manufacturing of a cooking utensil as claimed in claim 6, wherein the surface oil layer is using 30% to 55% of fluoropolymer resin co-formed with a polytetrafluoroethylene derived copolymer at a temperature of 430° C., and the mass fraction is 20%.

Description

BRIEF DESCRIPTION OF DRAWINGS

[0026] FIG. 1 is a cross-sectional view of a cooking utensil according to the present disclosure.

[0027] FIG. 2 is an enlarged view of part A in FIG. 1.

[0028] FIG. 3 is a step diagram of a method for manufacturing of a cooking utensil according to the present disclosure.

DETAILED DESCRIPTIONS OF EMBODIMENTS

[0029] In order to further explain the technical content of the present disclosure, the present disclosure will be described in detail below through specific embodiments.

[0030] As shown in FIG. 1, the present disclosure provides a cooking utensil, including a blank 1 of the cooking utensil, and a non-stick layer 2 coated on the surface of the blank 1; wherein the non-stick layer 2 comprises a primer layer 21 in contact with one side of the blank 1, and a sheet-like graphene, a sheet-like graphene derivative or a combination thereof uniformly distributed in the primer layer 21; wherein the mass fraction of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in a water-based paint used to form the primer layer 21 is 28% to 32%; wherein a side of the blank 1 facing the non-stick layer 2 has a uniformly rough structure having a roughness ranging from 3 μm to 5 μm; wherein a radial width of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof is ranging from 5 μm to 20 μm; wherein a thickness of the non-stick layer 2 is ranging from 50 μm to 60 μm. Further as shown in FIG. 2, the non-stick layer 2 includes a sealing layer 22, a middle oil layer 23 and a surface oil layer 24 in order on the top of the primer layer 21. Among the thickness percentages of each layer, the thickness of the primer layer 21 is 35% to 45%, and the thickness of the sealing layer 22 is 15% to 25%, wherein the thickness of the middle oil layer 23 is 20%, and the thickness of the surface oil layer 24 is 20%.

[0031] The present disclosure also provides method for manufacturing of a cooking utensil, as shown in FIG. 3, including the following steps:

[0032] S10: roughening a surface of a blank 1 of a cooking utensil, then proceeding to step S20; wherein “roughening the surface of the blank 1” described in the step S10 is roughening the surface of the blank 1 of the cooking utensil by sandblasting, and the surface roughness of the blank 1 is 3 μm to 5 μm; wherein the step S10 further includes a cleaning step and a drying step that after finishing the step of roughening the surface of the blank of the cooking utensil, firstly performing alkaline cleaning at 35° C. to 45° C., then carry out two rounds of washing with water at room temperature, then carrying out acid cleaning at room temperature, then carrying out washing with water at room temperature, and then carrying out washing with pure water at room temperature, and finally drying at 150° C.

[0033] S20: spraying a water-based paint containing a sheet-like graphene, a sheet-like graphene derivative or a combination thereof that forms a primer layer 21 on the surface of the blank 1, then spraying a sealing layer 22 on the undried surface of the primer layer 21, and baking, and then proceeding to step S30; wherein the mass fraction of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in a water-based paint used to form the primer layer 21 is 28% to 32%; wherein the sealing layer 22 is formed by 10% polyethersulfone resin and 5% polyamide-imide resin, which are closely combined with polytetrafluoroethylene resin at 150° C. to 180° C., and the mass fraction is 20% to 22%; wherein the baking described in the step S20 is baking at a temperature ranging from 150° C. to 180° C. for 3 minutes to 5 minutes. If the mass fraction of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in the water-based paint is lower than 28% or higher than 32%, the thermal conductivity uniformity and thermal conductivity rate will be significantly reduced. In addition, if the primer layer 21 is dried before spraying the sealing layer 22 on the surface, the hardness, wear durability and salt water corrosion resistance will be reduced.

[0034] S30: spraying a medium oil layer 23 and a surface oil layer 24 on a surface of the sealing layer 22 in sequence, and then performing firing to obtain a cooking utensil with a non-stick layer 2; wherein the firing described in the step S30 is firing at a temperature of 430° C. for 3 minutes to 5 minutes; wherein the medium oil layer is formed by filling a material containing 3% to 5% of silicon carbide uniformly into 30% to 55% of fluoropolymer resin at a temperature of 430° C., to improve non-stickiness and wear resistance; wherein the surface oil layer is using 30% to 55% of fluoropolymer resin co-formed with a polytetrafluoroethylene derived copolymer at a temperature of 430° C., and the mass fraction is 20%, to further strengthen the non-stickiness.

[0035] According to the description above, by controlling the amount of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in the primer layer 21, sufficient contact between the primer layer 21 and the blank 1 is fully ensured. The primer layer 21 and the blank 1 are fully combined and have reliable connection, thereby improving wear resistance of the non-stick layer 2. At the same time, the excellent thermal conductivity of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof is used to shorten the heating time and improve the uniformity of heating. The roughness of the surface of the blank 1 ensures that the primer layer 21, especially the sheet-like graphene, the sheet-like graphene derivative or the combination thereof, has more contact area with the blank 1 than a planar surface, and the two are combined more firmly with each other. At the same time, the sheet-like graphene, the sheet-like graphene derivative or the combination thereof are evenly spread in the primer layer 21 to form a certain orderly arrangement, which fully improves the heat transfer effect. The sheet-like graphene, the sheet-like graphene derivative, or the combination thereof with a radial width of 5 μm to 20 μm is selected to cooperate with the primer layer 21 and the sealing layer 22, the sheet-like graphene, the sheet-like graphene derivative, or the combination thereof in the primer layer 21 are limited by the blank with the rough surface and the sealing layer 22 to form an orderly tile, giving full play to the thermal conductivity of the sheet-like graphene, the sheet-like graphene derivative, or the combination thereof to ensure the heat transfer rate and the uniformity of thermal conductivity. The thickness of the non-stick layer 2 is ranging from 50 μm to 60 μm. The non-stick layer 2 of the present disclosure sufficiently guarantees the wear resistance. The sheet-like graphene, the sheet-like graphene derivative or the combination thereof cooperates with the rough structure of the blank 1 of the cooking utensil to effectively improve the thermal conductivity and wear resistance of the obtained cooking utensil with the target non-stick layer 2.

[0036] Example 1, Example 2, Example 3, and Example 4 are presented below. The difference between Examples 1 to 4 is that the thickness ratio of each layer in the non-stick layer 2 is different, as shown in Table 1. The cooking utensils used are all pans of the same style. Examples 1 to 4 are all cooking utensils with the target non-stick layer 2 obtained according to the method for manufacturing the aforementioned cooking utensil. The primer layers 21 are all prepared with a water-based paint containing sheet-like graphene, and the mass fraction of sheet-like graphene in the water-based paint is 28% to 32%.

TABLE-US-00001 TABLE 1 The thickness ratio of each layer in the non-stick layers obtained in Examples 1 to 4 item Example 1 Example 2 Example 3 Example 4 primer layer 35% 38% 40% 45% sealing 25% 22% 20% 15% layer medium oil 20% 20% 20% 20% layer surface oil 20% 20% 20% 20% layer

[0037] The performance test of Examples 1 to 4 and the reference example is carried out, and the specific test method is shown in the following T1-T6, and the specific performance test data is shown in Table 2; wherein the comparative example is using the pan with the same style, and the non-stick coating used is the conventional PTFE coating.

[0038] T1: wear resistance (2.5 kg dry grinding):

[0039] The sample is fixed on the abrasion tester, then 3M7447B scouring pad (length 70 mm, width 30 mm) is put into the sample, the scouring pad is pressed down with a force of 2.5 kg, and the surface of the sample is wiped back and forth across at a rate of 33 times/min. The scouring pad is changed every 500 times, and the number of wipes back and forth are recorded until the metal substrate is exposed. The higher the number of wipes recorded, the higher the abrasion durability.

[0040] T2: non-stickiness test (frying an egg without oil) The sample is placed on a flat-panel electric furnace for dry heating. When the surface temperature of the inner coating reaches 140° C. to 170° C., a fresh egg is broken and added into the sample. When the egg whites are basically solidified (the temperature of the inner surface of the sample should not exceed 210° C.), the eggs are poured out directly without external force. The preceding steps are repeated continuously, and the number of eggs tested are recorded until the sample sticks. The more eggs tested, the better the non-stickiness.

[0041] T3: Coating hardness test

[0042] The STAEDTLER pencils are used on 46 grit corundum sandpaper to smooth the tip of the lead to make the edge of the lead sharp. The pencil is placed correctly on the pencil hardness tester and the pencil hardness tester is pushed forward with horizontal force. After a scratch about 10 mm to 20 mm long is drawn on the coated surface of the sample, check whether the coated surface is scratched. If it is scratched, replace it with a pencil with lower hardness in turn and continue the test according to the above steps; if it is not scratched, record the hardness of the pencil in this test. The hardness of the pencil decreases from 9H to 8H, 7H, 6H, 5H, 4H, 3H, 2H, H in turn.

[0043] T4: thermal conductivity uniformity

[0044] A flat-panel electric furnace is used to heat the sample, and the thermal conductivity is observed with an infrared thermal imager. The more types of color images, the greater the temperature difference. The more irregular the color image pattern, the more uneven the temperature.

[0045] T5: heat conduction speed test

[0046] The sample is put on the induction cooker for dry heating. The time to ramp to 50° C. to 55° C. is recorded, and the time to ramp to 150° C. to 155° C. is recorded. The temperature increase time from 50° C. to 150° C. is calculated. The shorter the heating time, the faster the heat conduction.

[0047] T6: corrosion resistance test

[0048] 10 wt % salt water with more than half of the height of the pot wall to the sample. The salt water is firstly boiled on high heat, and then kept boiled on low heat. During this period, pure water is kept adding to keep the salt water concentration unchanged, until the 24th hour clean water is used to wash the sample. Observe whether the surface of the sample is corroded. If the surface of the sample is not corroded, repeat the above steps until the sample is corroded, and record the time it takes for the sample to corrode. The longer it takes, the better the corrosion resistance. The “salt water” mentioned therein is an aqueous sodium chloride solution.

TABLE-US-00002 TABLE 2 Performance index of the same style of frying pans obtained in Examples 1 to 4 and Comparative Example Corrosion resistance Wear non- Coating Thermal Thermal (10 wt % item durability stickiness hardness uniformity conductivity salt water) Example 1 80,000 870 or so 5H white-yellow- 90 seconds 72 hours times orange-purple-blue Example 2 100,000 More than 6H white-yellow- 70 seconds 240 hours  times 1000 orange-blue Example 3 110,000 More than 7H white-yellow- 70 seconds 240 hours  times 1000 orange-blue Example 4 100,000 More than 5H white-yellow- 120 seconds  96 hours times 1000 orange-purple-blue Comparative 10,000 127 or so 2H white-yellow- 150 seconds  24 hours example times light yellow-orange- purple-blue

[0049] The disclosure provides a cooking utensil with a non-stick layer 2. First, a primer layer 21 is attached to a surface of a blank 1 of the cooking utensil, and the primer layer 21 is orderly spread with a sheet-like graphene, a sheet-like graphene derivative or a combination thereof. The orderly arrangement of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof effectively ensure the great performance of the thermal conductivity of the sheet-like graphene, the sheet-like graphene derivative or the combination thereof. Not only the heat conduction is uniform and fast, but also the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in the primer layer 21 have excellent mechanical properties. When the sheet-like graphene, the sheet-like graphene derivative or the combination thereof in the primer layer 21 in cooperation with the uniformly rough structure of the blank 1, an effective support for the entire non-stick layer 2 is performed. The sealing layer 22 forms an effective protection for o the sheet-like graphene, the sheet-like graphene derivative or the combination thereof. Compared with the traditional fluorocarbon coating, the non-stick layer 2 of the present disclosure has the advantages of high surface hardness, good corrosion resistance, long-lasting wear resistance, good non-stickiness and long service life, and is a non-stick layer 2 with environmentally-friendliness, efficiency and comprehensive performance. The disclosure effectively guarantees the firmness and wear resistance of the product, thereby achieving the above-mentioned purpose of the present disclosure.

[0050] The above-mentioned embodiments and drawings do not limit the product form and style of the present disclosure, and any appropriate changes or modifications made by those of ordinary skill in the art should be regarded as not departing from the scope of the present disclosure.