Aerosol products, because of their ease of use and wide range of applications, are increasingly entering various industries and people's daily lives. Aerosol products are divided into tinplate cans, aluminum cans and plastic cans according to their packaging, among which tinplate cans are the most widely used and the phenomenon of corrosion inside the cans is also the most common. 

Every year due to corrosion caused by the leakage of aerosol products through the cans of the phenomenon occurred from time to time, the loss is huge, because of the complexity of the cause, the empty can manufacturers, filling manufacturers, businesses, users can not clearly define the responsibility, often can not be concluded, each assessed part of the loss of the matter, in fact, the corrosion of the aerosol can be prevented through the standardization of formulations, processes, and do a good job of stability testing.

1. Types of corrosion

(1) Even corrosion

Such as alkaline detergent and no internal coating of tinplate cans inside the tin-plated layer in contact with the complete de-tinning terminated.

(2) Pit corrosion and perforation

Localized dissolution of the metal leads to perforation.

(3) Fracture corrosion

Top, bottom cover and can body connection, easy to form a stagnant area, the contents of the existence of electrolyte concentration effect, easy to cause crevice corrosion. 

(4) Electro-coupling corrosion 

Can body of copper welding weld, due to the destruction of the tin layer, copper and iron electrode potential difference, in the presence of electrolyte, contact and produce galvanic coupling corrosion, although the weld has a complementary protective layer, but the electrolyte can arrive at the surface of the metal layer through the protective layer, the formation of corrosion batteries, resulting in corrosion.

(5) Stress corrosion

Forming deformation of the stress exacerbates the distortion, causing corrosion at the cracks, such as aluminum cans.

(6) Sub-membrane corrosion

Under the organic film or in the surface treatment film under the metal surface of the horizontal direction of the expansion of corrosion.

Formulator in doing product stability testing, less concerned about the above classification, generally according to the gas-phase corrosion, liquid-phase corrosion, gas-liquid interface corrosion to describe, and according to these three phenomena to select the appropriate corrosion inhibitor, adjust the formula.

2. from the formulation design to prevent corrosion of aerosol products

(1) tinplate cans for oil-based (solvent-based) aerosol products

General pure solvent-based formulations, no need to add corrosion inhibitors, corrosion will rarely occur, but there are exceptions, if the oil-based LPG pesticide batch leakage may be the cause of kerosene or LPG raw materials mixed with a trace amount of water, filling into the product, moisture to make some insecticidal active ingredient hydrolysis or kerosene impurity reaction, the precipitation of acid substances leading to corrosion of the can.

Solution:

① Measure the moisture content of the raw material, ensure that the moisture content is less than 100ppm.

② Add some water-soluble solvents, such as isopropyl alcohol, ethanol, etc. to disperse the trace water in the oily solvents and LPG, to prevent gathering and settling at the bottom.

 (2) Alcohol-based aerosol products in tinplate cans

Early air freshener formulations consisted mainly of flavors, anhydrous ethanol or isopropanol, LPG or DME. General. There is no need to add corrosion inhibitors to these products, and if 95% ethanol is used, 0.1% sodium benzoate can be added.

(3) Water-based aerosol products for tinplate cans

For tinplate cans without internal coating, general water-based products, the best PH control in 7.0 ~ 9.0, according to the functional requirements of the product, choose to add 0.1-0.2% of the gas-phase and liquid-phase corrosion inhibitors, such as sodium benzoate, sodium nitrite, triethanolamine, ammonia, phosphoric acid dihydrogen amine, morpholine and so on. The use and dosage of sodium nitrite should be carefully selected, as it may be counterproductive if there are ingredients in the formulation that oxidize sodium nitrite to sodium nitrate.

For tinplate cans with internal coating, the product PH should be controlled above 5.5, but not to use DME as the ejection agent, because DME will dissolve the internal coating, causing it to flake off and not play a protective role, and the flaking of the internal coating may clog the suction tube, resulting in the product can not be sprayed.

When the PH of water-based products>10 or even PH 12 or above, strong alkali will make its tinplate cans without internal coating of the internal tin layer dissolved, the cans show a grayish-black, we call it “passivation layer”, this phenomenon is called “de-tinning”, is when the tin is dissolved, exposing a dark gray film. This phenomenon is called “de-tinning”, is when the tin dissolution, exposing a dark gray film of tin-iron alloy FeSn2, and strong alkali further reaction iron passivation into black, to prevent further corrosion. When a passivation layer exists, the product rarely corrodes through the can.

 

Selection of high-quality qualified aerosol cans, aerosol valves is an important factor in preventing product corrosion, because the regular manufacturers of tinplate cans selected by the raw materials are more compliant, the process of making cans will be more stringent control of stamping, slicing, internal coating, can body welding, two volume sealing and other process quality, the production of tinplate cans in terms of pressure resistance, airtightness and corrosion resistance will be more secure.In mgaerosolcan, we offer high quality aerosol tin cans. Tell us what you need and we are at your service!

 

Aerosol cans, as a convenient form of packaging, are widely used in a variety of fields such as personal care, household cleaning, food and so on. With consumers increasingly concerned about environmental protection and convenience, the aerosol can industry is facing unprecedented opportunities for growth. This article explores future trends in the aerosol can industry, particularly in terms of sustainability, intelligence, and technological innovation.

-Sustainability: environmentally friendly materials and design

As the world becomes more aware of environmental protection, the aerosol can industry is progressively adopting more environmentally friendly materials and designs. Aluminum aerosol cans are preferred for environmentally friendly packaging due to their 100% recyclability. Manufacturers are working to increase the use of recycled aluminum and reduce the need for raw material extraction, thereby reducing energy use and greenhouse gas emissions. In addition, the application of lightweighting technology is also playing an important role in reducing material use and carbon emissions.

-Intelligent: integrating sensor and IoT technologies

Another notable trend in the aerosol can industry is intelligence. By integrating sensors and wireless communication technologies, smart aerosol tin cans are able to monitor the remaining amount, remind replacement, and integrate with smart home systems to provide a more convenient user experience. This intelligence not only enhances the user experience, but also helps in the effective management of resources.

-Market expansion: growth in emerging markets

Adoption of aerosol cans is on the rise as consumers in emerging markets continue to demand convenience and sustainability. Countries in Asia, Latin America and Africa are experiencing increased urbanization and the rise of the middle class, leading to increased consumption of personal care, household and pharmaceutical products. Aluminum aerosol cans are seen as a premium packaging option with durability, portability and environmental benefits that appeal to consumers in these regions.

-Environmental regulations: promoting green development of the industry

Increasingly stringent environmental regulations are placing higher demands on the aerosol can industry. Enterprises need to continue to develop environmentally friendly materials and processes to reduce the impact of products on the environment. At the same time, the government also through the development of relevant policies and standards to promote the green and sustainable development of the aerosol can industry.

-Conclusion

Future trends in the aerosol can industry suggest that sustainability, intelligence and technological innovation will be key drivers of industry growth. As consumer demand for environmentally friendly and convenient products continues to grow, the aerosol can industry must adapt to these changes to remain competitive in the market. By adopting environmentally friendly materials, smart technologies and continuous technological innovation, the aerosol can industry is expected to achieve sustainable growth while meeting consumer needs and expectations.

 

 

 

There are currently over 200 types of aerosol products used in personal, household, industrial, agricultural, construction, fire protection, safety, medical and other fields.

The aerosol valve may not seem eye-catching, but it is of utmost importance compared to the entire aerosol product. It not only affects the sealing performance of the product, but also the spraying effect, and of course, the stability of the entire aerosol product. Therefore, how to choose the appropriate valve is worth everyone's attention in the development process of aerosol products.

If we look at the types of valves, aerosols are mainly divided into two categories: one-component packaging and two-component packaging (BOV system). The main structure of one yuan aerosol includes: aerosol can body, aerosol valve, outer cover, actuator, propellant, and raw materials. The main results of binary aerosols include: aerosol can body, aerosol spray valve, extra layer of aluminum bag, outer cover, actuator, raw materials, and compressed gas.

Valves usually consist of seven parts: sealing cup, outer gasket, inner gasket, valve stem, spring, valve chamber, suction tube, etc. Considering different materials, sizes, and structures, theoretically, valves can exhibit billions of different variations.

Therefore, how to choose the appropriate spray valve requires comprehensive consideration of the following factors:

Firstly, is it a one-component valve or a BOV valve?

The compatibility issue needs to be considered when mixing the material and propellant in a one-component aerosol formulation. When both the propellant and the contents are sprayed out simultaneously, it is easy to produce a situation where the propellant has already been sprayed out while the material remains, which affects the consumer experience. Cannot be used 360 degrees, can only be used upright or upside down. Volatile propellants (such as butane or dimethyl ether) have a geometric fold increase in pressure with temperature, and are classified as hazardous materials with strict requirements for transportation and storage conditions.

Without considering cost factors, BOV valves have many advantages, such as:

The contents do not directly come into contact with the aerosol can, providing protection for the raw materials;

Spray out in all directions to adapt to diverse consumption scenarios;

Before filling, the valve bag can be vacuumed or disinfected by cobalt 60 irradiation. The formula can reduce preservatives and allergens;

The pressure inside the tank is constant, the spraying is stable, and the residual material is low;

Using compressed air or nitrogen, the pressure remains almost constant with increasing temperature, and the requirements for transportation and storage are relatively low.

Secondly, the choice of material for the sealing cup?

The thickness of tinplate cups is usually 0.27mm, and the thickness of aluminum cups is usually 0.42mm. The application in the field of personal care products usually uses aluminum cups, which are more stable and less prone to rusting. The size stability of the tinplate cup is better, and it is not easily affected by the aerosol can body or sealing process;

Thirdly, the material of the gasket

Gaskets are usually divided into inner gaskets and outer gaskets, with various materials including butyl, chloroprene, butyl, chlorobutyl, nitrile, chloroprene, polyurethane, and so on. Shrinkage of the gasket will affect the fit between the valve stem and gasket, sometimes leading to leakage. If the gasket expands excessively, the valve stem hole of the gasket cannot be exposed when pressing the nozzle, which will affect the spraying efficiency. After repeated experiments, a mixture of 75% ethanol and 25% isopentane was used for gold testing, and the best choices were chloroprene rubber (NEOPRENE) and butadiene sodium rubber (BUNA), which were relatively stable.

Fourth: Valve stem orifice

Common sizes include 0.35, 0.4, 0.46, 0.51, and 0.61mm, and the number of valve stem holes is one of the determining factors for the ejection rate. There are also different series of valve stem air holes, including 1, 2, 4, 6, and even 8 holes.

Fifth: Valve side hole

The gas phase side hole is located on the valve housing and is located inside after the valve is sealed. It is mainly used to increase atomization effect, increase the stability of content spraying for some powder products, and increase the spraying of high viscosity products. There are both single hole and double hole designs.

Sixth: Dip tube length

At the initial setting, the valve length can be calculated as the total height of the aerosol can minus the set value. Then, through compatibility testing, confirm the degree of shrinkage of the dip tube in the product, and the final valve length should be such that the bottom of the dip tube is at the lower one-third of the half circle at the bottom of the can after soaking and stabilizing.

Considering that dip tube have a 3-6% expansion rate, it is crucial to confirm the length after compatibility testing. Of course, a straw design with oblique cuts can also be slightly helpful.

Paired with appropriate buttons, the selected aerosol valve can convey the characteristics of the aerosol to consumers. As a packaging solution for complex products, compatibility and stability testing are required to design stunning products!

 

Definition

2K aerosol cans are specialized containers that typically have two separate openings, each of which can be used to release or fill contents. This design distinguishes them from traditional single-opening aerosol cans.

--2k aerosol tin cans--	--1k aerosol tin cans--
	This can have a partition structure inside to prevent premature mixing of two different contents. They are only allowed to come into contact through specific operations when needed.

How to install and use?

The short valve is installed on the side filled with curing agent. Before use, press the black button to mix curing agent with spray paint, and then press the white nozzle to use spray paint.

 

The working principle of a 2k (two-component) paint can is to pack two different components (usually paint and curing agent) in two different tanks or chambers, mix them together through a specific device or operation when used, and then spray. Before mixing, the two components are independent of each other and do not undergo chemical reactions. When spray painting is required, the channel connecting the two components is opened by pressing the nozzle, rotating the pull ring, or other operation, so that they are mixed at the nozzle. The mixed paint will cure quickly in the air to form a hard, durable paint film.

New Design of 2K Aerosol Can

Over the recent years, 2K aerosol tin cans have been increasingly well-received in the market and have established themselves as one of our top-selling products. Taking into account the feedback provided by our customers concerning their usage, we have implemented a range of improvements and upgrades to this product. Presented here are some comparative reference images for your examination.

--Aerosol valve--	--Inron spacer--
--Can body--	--A complete set--
--Iron spacer testing data comparison--

More Details

Here are more details about the new design of 2k aerosol tin cans

The packaging materials commonly used for cosmetic tubes include plastics and aluminum. Here are some commonly used materials for cosmetic tube packaging:

Plastic Materials: Common plastic materials used for cosmetic tubes include polyethylene (PE), polypropylene (PP), ethylene vinyl acetate (EVA), polyvinyl chloride (PVC), and more. They offer characteristics such as lightweight, durability, transparency or translucency, and are often used to package various types of cosmetic products.

Aluminum Materials: Aluminum tubes are commonly used for high-end cosmetic products. Aluminum provides excellent barrier properties, effectively protecting the contents from oxygen, moisture, and external contaminants. Aluminum tubes often have a metallic appearance and can be printed and decorated to display brand logos and information.