Cosmetic bottle coating and spraying process thereof

Abstract

The invention provides a cosmetic bottle coating and a spraying process thereof, and the spraying process comprises the following steps: S1, coating preparation; mixing silicon oxide, boron oxide, zinc oxide, aluminum oxide and yttrium oxide in proportion, and adding a dispersing agent and deionized water; s2, conducting layer spraying; after the glass bottle is subjected to plasma activation, a conductive layer is sprayed, and S3, paint is subjected to electrostatic spraying; spraying is performed twice according to different film thicknesses; s4, sintering is carried out; and multi-stage temperature sintering is adopted. According to the invention, silicon oxide is used as a glass network skeleton, the chemical stability of the glass network skeleton is determined, boron oxide is used as a fluxing agent, the melting point of the glass is reduced to below 600 DEG C, the glass is not easy to crack in a high-temperature sintering state, and yttrium oxide is added to further improve the thermal shock resistance of the glaze layer, so that the glass can better adapt to a glass substrate, and the service life of the glass is prolonged. And the nano ITO / ZnO conductive layer and a low-temperature step sintering process are combined, so that the problems of poor adhesive force and sintering cracking of the electrostatic spraying glaze layer of the non-conductive glass bottle body are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of spraying processes for cosmetic bottles, and particularly to a coating for cosmetic bottles and its spraying process. Background Art

[0002] In the field of packaging materials, especially in the field of cosmetic packaging materials, glass substrates are widely used for containing essence water, emulsion, cream, etc. In order to achieve good protection effects, while enhancing the aesthetic and artistic quality of the packaging and improving the recognition of cosmetic brands, the industry usually performs painting treatment on the surface of glass bottles. For glass substrates, glass baking varnishes cured by high-temperature baking are generally selected. After spraying and baking curing, a dense coating can be formed on the surface of the glass bottle. The coating can have different colors, gloss levels, etc. Subsequently, operations such as ink printing and decal application can be carried out on this coating as needed to further enhance the decorative and recognition effects.

[0003] Since cosmetic bottles are usually made of glass substrates, their spraying processes mainly adopt electrostatic spraying methods. However, because glass substrates are insulators, direct electrostatic spraying requires pretreatment of the bottle surface, and a conductive primer needs to be applied to the bottle surface to form a conductive coating on the outer surface of the cosmetic bottle, and then the electrostatic spraying method is used to spray its surface.

[0004] However, the existing conductive primers are prone to failure after high-temperature sintering, resulting in the peeling off of the glaze layer. Moreover, traditional glass glazes are mainly composed of silicates, which require the addition of a high proportion of cosolvents, leading to heavy metal risks and difficult matching of the thermal expansion coefficient with the glass substrate, making it prone to cracking after sintering. Summary of the Invention

[0005] In view of the above-mentioned disadvantages of the prior art, the purpose of the present invention is to provide a coating for cosmetic bottles and its spraying process, which are used to solve the problem that traditional glass glazes are prone to peeling off and cracking after high-temperature sintering in the prior art.

[0006] To achieve the above purpose and other related purposes, the present invention provides a coating for cosmetic bottles. By weight percentage, the coating for cosmetic bottles includes the following components in the following percentage contents: silicon oxide 50 - 65%, boron oxide 12 - 20%, zinc oxide 10 - 18%, aluminum oxide 3 - 6%, yttrium oxide 0.5 - 2%, and a dispersant; the molar ratio of yttrium oxide to zinc oxide is 1:1.2 - 1.5.

[0007] By adopting the above technical solution, silica is used as the glass network framework to determine its chemical stability. Then, boric oxide is used as a flux to reduce the melting point to below 600 °C. Next, zinc oxide is used to adjust its thermal expansion coefficient so that it is not prone to cracking under high-temperature sintering conditions. Furthermore, by adding yttrium oxide, the thermal shock resistance of its glaze layer can be further improved, and there is no need to add high-proportion fluxes such as silicate, making the sprayed coating more firm and reliable.

[0008] In an embodiment of the present invention, the dispersant is ammonium polyacrylate, and the percentage content of the dispersant is 0.3 - 1%.

[0009] By adopting the above technical solution, using ammonium polyacrylate as the dispersant can prevent the agglomeration of nanoparticles in the coating.

[0010] A cosmetic bottle body coating spraying process as described above includes the following steps: S1, coating preparation; mixing silica, boric oxide, zinc oxide, alumina, and yttrium oxide in proportion, and adding a dispersant and deionized water; S2, spraying the conductive layer; after activating the glass bottle by plasma, spraying the conductive layer; S3, electrostatic spraying the coating; spraying in two times with different film thicknesses; S4, sintering; using multi-stage temperature sintering.

[0011] In an embodiment of the present invention, in step S1, the mixed solution is ball-milled for 48 hours until D50 = 1.2 μm.

[0012] In an embodiment of the present invention, in step S2, the conductive layer includes indium tin oxide and zinc oxide, and the ratio of indium tin oxide to zinc oxide is 8:2, with a particle size ≤ 30 nm.

[0013] In an embodiment of the present invention, in step S3, the single-pass spraying thickness is 10 - 15 μm, and the total film thickness is 25 - 30 μm.

[0014] In an embodiment of the present invention, in step S4, it includes:

[0015] S41, pre-sintering, the sintering temperature is 150 °C, and the sintering time is 25 - 35 minutes;

[0016] S42, transitional crystallization stage, the sintering temperature is 450 °C, and the sintering time is 15 - 25 minutes;

[0017] S43, melting and heat preservation stage, the sintering temperature is 600 °C, and the sintering time is 25 - 35 minutes;

[0018] S44, slow cooling, the sintering temperature is slowly reduced from 600 °C to 200 °C.

[0019] In an embodiment of the present invention, in step S44, the temperature reduction rate during slow cooling is 2 °C / min.

[0020] As described above, the cosmetic bottle body coating and its spraying process of the present invention have the following beneficial effects: Silicon oxide is used as the glass network skeleton to determine its chemical stability. Then, boron oxide is used as a flux to reduce its melting point to below 600°C, making it not easily cracked under high-temperature sintering. Adding yttrium oxide can further improve the thermal shock resistance of its glaze layer, making it more adaptable to the glass substrate. Combining with the nano-ITO / ZnO conductive layer and the low-temperature step sintering process, the problems of poor adhesion and sintering cracking of the electrostatic spraying glaze layer on the non-conductive glass bottle body are solved. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It shows a schematic diagram of the steps disclosed in the second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0022] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0023] Please refer to Figure 1 . It should be noted that the structures, ratios, sizes, etc. shown in the drawings of this specification are only used to cooperate with the content disclosed in the specification for those skilled in the art to understand and read, and are not used to limit the limited conditions under which the present invention can be implemented. Therefore, they do not have technical essence. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope that can be covered by the technical content disclosed in the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle", and "one" cited in this specification are only for the convenience of description and are not used to limit the scope under which the present invention can be implemented. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope under which the present invention can be implemented.

[0024] Example 1:

[0025] This example provides a cosmetic bottle body coating. By weight percentage, the cosmetic bottle body coating includes the following components in percentage content:

[0026] 50-65% of silicon oxide, 12-20% of boron oxide, 10-18% of zinc oxide, 3-6% of aluminum oxide, 0.5-2% of yttrium oxide, and a dispersant; the molar ratio of yttrium oxide to zinc oxide is 1:1.2-1.5, and the dispersant is ammonium polyacrylate.

[0027] In this example, the mass percentage content of silicon oxide is 58%, the content of boron oxide is 16%, the content of zinc oxide is 14%, the content of aluminum oxide is 5%, the content of yttrium oxide is 1%, the content of ammonium polyacrylate is 0.5%, and the balance is deionized water.

[0028] Silica serves as the glass network skeleton, and boron oxide serves as a flux to lower its melting point below 600 °C in combination with silica. Then, zinc oxide is used to adjust its thermal expansion coefficient and enhance its alkali resistance. Next, alumina is used to inhibit crystallization and increase the hardness of the glaze layer. Subsequently, yttrium oxide is used to enhance the thermal shock resistance of the glaze layer so that ΔT ≥ 300 °C. A dispersant is used to prevent nanoparticle aggregation, and deionized water is used to adjust it into a solvent.

[0029] Example Two:

[0030] This example provides a spraying process for the cosmetic bottle body coating as described in Example One, including the following steps:

[0031] S1. Coating preparation: Mix silica, boron oxide, zinc oxide, alumina, and yttrium oxide in proportion, add a dispersant and deionized water, and ball mill the mixed solution for 48 hours to make D50 = 1.2 μm;

[0032] S2. Conductive layer spraying: After activating the glass bottle by plasma, spray the conductive layer.

[0033] The conductive layer includes indium tin oxide and zinc oxide, and the ratio of indium tin oxide to zinc oxide is 8:2, with a particle size ≤ 30 nm. After the glass bottle is activated by plasma, an ITO / ZnO suspension (solid content 15%) is electrostatically sprayed to form a 2 - 3 μm conductive layer with a resistance ≤ 5 × 10 3 Ω / sq, and it is chemically bonded to the glaze layer after high-temperature sintering.

[0034] S3. Electrostatic spraying of the coating: Spray in two times with different film thicknesses;

[0035] A two-component rotary cup spray gun can be used, with the spraying distance controlled at 200 ± 10 mm, the atomizing air pressure at 0.3 - 0.5 MPa. Then, a two-step spraying is carried out, with a single spraying of 10 - 15 μm and a double spraying to make the total film thickness 20 - 30 μm.

[0036] S4. Sintering: Adopt stepped multi-stage temperature sintering;

[0037] S41. Pre-sintering, the sintering temperature is 150 °C, and the sintering time is 25 - 35 minutes, which can remove the moisture and dispersant in the mixed solution;

[0038] S42. Transition crystallization stage, the sintering temperature is 450 °C, and the sintering time is 15 - 25 minutes, to crystallize the yttrium oxide and zinc oxide conductive layer and initially bond it with the glaze;

[0039] S43. Melting and holding stage, the sintering temperature is 600 °C, and the sintering time is 25 - 35 minutes, to fuse the boron oxide, silica, and zinc oxide system to form a dense glaze layer;

[0040] S44. Slow cooling: The sintering temperature is slowly decreased from 600 °C to 200 °C at a rate of 2 °C / min. Slow cooling can release thermal stress and prevent cracking.

[0041] In summary, in the present invention, silicon oxide is used as the glass network framework to determine its chemical stability. Then, boron oxide is used as a flux to reduce the melting point to below 600 °C, making it not easy to crack in the high-temperature sintering state. Adding yttrium oxide can further improve the thermal shock resistance of its glaze layer, making it more suitable for glass substrates. Combining with the nano-ITO / ZnO conductive layer and the low-temperature step sintering process, the problems of poor adhesion and sintering cracking of the electrostatic spraying glaze layer on non-conductive glass bottles are solved.

[0042] Therefore, the present invention effectively overcomes various disadvantages in the prior art and has high industrial utilization value.

[0043] The above embodiments are only illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Any person familiar with this technology can modify or change the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes completed by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed by the present invention should still be covered by the claims of the present invention.

Claims

1. A cosmetic bottle coating, characterized in that, By weight percentage, the coating for the cosmetic bottle body comprises the following components in the following percentage contents: Silicon oxide 50 - 65%, boron oxide 12 - 20%, zinc oxide 10 - 18%, aluminum oxide 3 - 6%, yttrium oxide 0.5 - 2%, dispersant; the molar ratio of yttrium oxide to zinc oxide is 1:1.2 - 1.

5.

2. The coating for a cosmetic bottle body according to claim 1, characterized in that: The dispersant is ammonium polyacrylate, and the percentage content of the dispersant is 0.3 - 1%.

3. A spraying process for the coating of a cosmetic bottle body as described in any one of claims 1-2, characterized in that: It includes the following steps: S1, coating preparation; mix silicon oxide, boron oxide, zinc oxide, aluminum oxide, and yttrium oxide in proportion, and add a dispersant and deionized water. S2, spraying the conductive layer; after plasma-activating the glass bottle, spray the conductive layer. S3, electrostatic spraying the coating; spray twice with different film thicknesses. S4, sintering; use stepwise multi-stage temperature sintering.

4. The cosmetic bottle body coating spraying process according to claim 3, wherein: In the step S1, ball-mill the mixed solution for 48 hours until D50 = 1.2 μm.

5. The spraying process of the cosmetic bottle body coating according to claim 3, characterized in that: In the step S2, the conductive layer comprises indium tin oxide and zinc oxide, and the ratio of indium tin oxide to zinc oxide is 8:2, with a particle size ≤ 30 nm.

6. The spraying process of the cosmetic bottle body coating according to claim 3, characterized in that: In the step S3, the single-pass spraying thickness is 10 - 15 μm, and the total film thickness is 25 - 30 μm.

7. The spraying process of the cosmetic bottle body coating according to claim 3, characterized in that: In the step S4, it includes: S41, pre-sintering, the sintering temperature is 150 °C, and the sintering time is 25 - 35 minutes; S42, transitional crystallization stage, the sintering temperature is 450 °C, and the sintering time is 15 - 25 minutes; S43, melting and heat preservation stage, the sintering temperature is 600 °C, and the sintering time is 25 - 35 minutes; S44, slow cooling, the sintering temperature is slowly reduced from 600 °C to 200 °C.

8. The spraying process of the cosmetic bottle body coating according to claim 7, characterized in that: In the step S44, the rate of temperature reduction during slow cooling is 2 °C / min.

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