Performance and application of waterborne metallic paint inside and outside metal packaging containers

Performance and application of waterborne metallic paint inside and outside metal packaging containers

Tianjin Ruibao Green Nano Coating Co., Ltd. Yan Guochen

First, the company profile

Tianjin Ruibao Green Nano Coating Co., Ltd. was established in 2000. The company is located in the National Science and Technology Industrial Park of Beichen District, Tianjin, with the registered trademark “Qinuo”. The company's self-developed water-based industrial coating series products are dedicated to the harmony between corporate development and social development by changing the harm and impact of traditional paints on people and nature. After more than ten years of market revitalization, the company has grown into an industrialized, multi-class water-based industrial coatings research and development, production, sales and service of a professional enterprise. The company's professional water-based industrial coating product research and development advantages and excellent process supporting service capabilities have won the leading position in the domestic water-based coatings industry market for Ruibao, among which the water-based metal paint series products have been widely used in the metal products industry:

2. Introduction of water-based metallic paint products inside and outside metal packaging containers

The products are mainly divided into the following categories: inner coating ordinary color lacquer, inner coating food hygiene grade monochromatic lacquer, outer coating monochromatic lacquer, outer coating color separation lacquer.

1. Water-based paint in metal packaging containers:

This product belongs to water-based epoxy products. It is a water-based industrial paint specially designed for the internal coating of food metal packaging containers according to the requirements of domestic and international industry standards. Its environmental protection index is in full compliance with the GB11677-1989 water-based modified ring. Hygienic standard for interior coatings of oxygen cans, its quality standards fully meet the requirements of industry standards.

2. Water-based metallic paint outside the metal packaging container:

This product is a water-based product. It is a high-performance product derived from our water-based color steel coating. It is divided into two application categories: monochrome and color separation. Its environmental indicators fully implement the EU Environmental Protection Standards (RoHs), and its quality standards fully meet the industry standards.

3. Main quality indicators of water-based metallic paint inside and outside metal packaging containers
Viscosity: >60 seconds (25 °C coated -4 cups)
Density: 1.1-1.3g/cm3
PH value: 8-9
Performance:
Hardness: ≥2H
Adhesion: 100% cross-cut
Water resistance: >240h
Artificial aging resistance: >300h
Chemical resistance: >48h
Xylene resistant: >2h
Butanone-resistant wipe: >120 times
Recoil: 50kg.cm
Bend: 1mm
Cup protrusion: >6.5mm
Light (60°): >80°
Salt spray resistance: >168h (dry film thickness >25μm)

4, the characteristics of water-based metal paint:

Since the water-based metal paint product uses water-based resin and water-based auxiliary solvent, it has the characteristics of non-combustible, non-explosive, environmentally safe and safe; its film-forming material is also a conventional epoxy, acrylic, polyester film-forming material, so the film is coated. Anti-corrosion and anti-rust performance is no different than the familiar paint in the industry.

However, in terms of safety and environmental protection of product applications, the superior advantages of water-based paints have been well demonstrated:

1 Low dilution cost: In the application process, the water is diluted to adjust the viscosity, completely eliminating the hidden dangers of organic solvents being toxic and flammable, and saving a lot of dilution costs.

2 Product application has no potential risks: in the two aspects of coating coating and drying, whether it is self-drying or drying, it is basically done indoors. This process is also a process of highly diffusing harmful substances. There are two major paints. Hidden dangers: Paint construction workers can't avoid the high volatile environment of toxic solvents and easily lead to additive poisoning; the mixed gas of flammable volatiles and air reaches a certain concentration, and it is easy to detonate when exposed to open flames or sparks. Application enterprises bring great risks, and the main volatilization of water-based paints is water. The above two hidden dangers naturally do not exist.

3 Energy-saving and emission-reducing benefits: Due to the use of water-based materials, the discharged substances are harmless substances, and the water-based paints have no irritating odor as paint, thus effectively improving the application environment. From the stable employment of enterprises to emission reduction indicators and other aspects, it provides very valuable conditions for application companies.

5. Fully recycling and reuse of water-based paint:

The coating method of the metal packaging container is mainly sprayed, and its utilization rate is low, and a large proportion is discharged with the exhaust air, resulting in waste and pollution. Some companies have tried to recycle paint, but they have given up because of the troublesome process and high recycling cost. The water-based paint can be fully reused by adding a simple recovery device, and the recycling cost is extremely low. See the schematic diagram of the full recovery and reuse device below:

Full recovery and reuse schematic

Third, the use of water-based metallic paint inside and outside metal packaging containers

Practice makes perfect, each product application enterprise is quite skilled in the application of conventional paints. You are experts and teachers in application. The reason why you need to exchange application content here is because some enterprises do not apply paint to water-based paints. So proficient.

For users who are not familiar with water-based paints, there is no need to be the first person to eat crabs. Water-based paint has a history of application for more than ten years even in China. It is similar to the application of traditional paints. The overall construction is the same as the paint. It can be put into production without changing the existing coating equipment. The small difference means that the organic solvent is different from the water as the solvent. The oil (paint) water is incompatible, so it is necessary to apply the water-based paint. The appropriate notes for the application:

1. Differences in substrate processing requirements:

For the degreasing, phosphating, washing and drying of metal packaging drums, the water-based paints are much wider than the paint. The water-soluble paints are not harsh and must be absolutely dried. Dry (but should also try to keep as little residue as possible).

For non-standard coating lines without degreasing, phosphating and washing, it is also because of the incompatibility of oil and water. The requirements for degreasing and decontamination of water-based paints are relatively strict, and the dirt should be minimized before painting. Residues to ensure adhesion and appearance of the paint film.

2, painting equipment cleaning is more convenient:

The water-based paint is applied cross-over, color-changing or construction. It can be cleaned with clean natural water. The cleaning process and sequence are the same as the paint.

Washing with water is more expensive than cleaning with organic solvents, saving a lot of real money.

3. Construction viscosity and dilution:

Because the solubility of water is not as strong as the solubility of organic solvents, the application viscosity of water-based paints is generally higher than that of paints. In combination with the application practice and spraying equipment and other specific working conditions, in the conventional construction of metal packaging container spray coating, the viscosity value is suitable in the interval of 30 seconds - 40 seconds, the specific viscosity value can be adjusted according to the construction conditions.

Use deionized water or clean natural water with conductivity less than 500Ω.cm, dilute the original paint according to the ratio of original paint to water 100: 20-30, monitor the viscosity while stirring, add 20%-30% water is not absolute The quantitative ratio is because the temperature of the construction environment varies with the region. Because the ambient temperature directly affects the viscosity of the original paint (as well as the paint), the dilution ratio changes. Some coating processes require liquid paint during construction. The temperature is relatively constant (generally heating up to 35-45 ° C), then the determined constant temperature and dilution ratio must also change.

4, spraying, drying and finished product acceptance:

1The air-spraying and high-pressure airless spraying equipment widely used in the metal packaging container coating industry. The effect of spraying water-based paint is basically the same as that of spraying paint. Therefore, the spraying of water-based paint can completely utilize the original spraying equipment of the production line and the city. Soldering equipment for sale. The spray parameters are also essentially the same as the paint.

2 industry used to use the baking room, drying tunnel drying method, low, high and low three sections baking process, also suitable for water-based paint. For high-temperature and high-efficiency production lines, the temperature of the water-based paint can be much higher than that of the paint without the danger of explosion. The appearance of the paint film ensures the level of the film.

The baking temperature and market parameters of the conventional coating line water-based paint are as follows:

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