Printing innovation under environmental protection policies: How can water-based ink wetting agents help green production?

In today's society, environmental protection has become a global focus, and countries have introduced strict environmental protection policies to cope with increasingly severe environmental problems. As an important part of the traditional manufacturing industry, the printing industry is also facing huge environmental pressure. In the traditional solvent-based ink printing process, a large amount of volatile organic compounds (VOCs) will be released, causing serious harm to air quality and human health. In this context, water-based ink printing has gradually become a new trend in the development of the industry with its environmental advantages, and water-based ink wetting agents, as key additives in water-based ink printing, are playing an irreplaceable role in helping the printing industry achieve green production.

Environmental dilemma of traditional printing

Traditional solvent-based ink printing uses organic solvents as diluents, which will quickly evaporate into the air during the drying process of the ink. VOCs not only participate in atmospheric photochemical reactions to form pollutants such as ozone and fine particulate matter (PM2.5), leading to frequent smog weather, but also cause damage to the human nervous system, respiratory system and immune system. Long-term exposure to high-concentration VOCs may cause symptoms such as headaches, dizziness, coughing, and difficulty breathing, and even increase the risk of cancer.

In addition, a large amount of waste liquid and waste residue will be generated during the production and use of solvent-based inks. Improper treatment of these wastes will cause pollution to soil and water sources. Moreover, most organic solvents are flammable and explosive, and there are certain safety hazards during storage, transportation and use.

The green advantages of water-based ink printing

Water-based ink printing uses water as the main solvent, which greatly reduces the use of organic solvents. Compared with solvent-based inks, the VOCs emissions of water-based inks can be reduced by 80% - 90%, and the pollution to the environment is significantly reduced. At the same time, water-based inks are non-toxic and odorless, and the health hazards to operators are also greatly reduced.

Water-based ink printing also has good degradability. The waste after printing is more easily decomposed by the natural environment and will not remain in the environment for a long time like solvent-based inks. Moreover, the raw materials of water-based inks are widely available and the cost is relatively low, which has certain economic advantages.

Water-based ink wetting agent: the "behind-the-scenes hero" of water-based ink printing

Optimize water-based ink performance and improve printing quality

Although water-based ink is environmentally friendly, it has some shortcomings in performance compared with solvent-based ink, such as slow drying speed, poor adhesion, and poor fluidity. Water-based ink wetting agent is like a magical "performance optimizer" that can effectively improve these properties of water-based ink.

It can reduce the surface tension of water-based ink, so that water-based ink can better wet the printing substrate, such as paper, plastic film, etc. When water-based ink contacts the substrate, the wetting agent molecules will form an interfacial film between the water-based ink and the substrate, reducing the interfacial tension between the two and promoting the spreading of water-based ink on the surface of the substrate. In this way, the printed patterns and text will be clearer, fuller, and the colors will be more vivid.

For example, when printing plastic film, it is difficult for water-based ink to spread evenly on its surface because the surface of the plastic film is smooth and hydrophobic. After adding an appropriate amount of water-based ink wetting agent, the water-based ink can better adhere to the surface of the film, avoiding problems such as missing printing and flower plates, and improving the printing quality.

Adjust the drying speed to meet different process requirements

The drying speed of water-based ink has an important impact on printing efficiency and product quality. If the drying speed is too fast, the water-based ink may dry prematurely on the printing plate, resulting in plate blockage; if the drying speed is too slow, the printed product is prone to sticking when rolling or stacking. Water-based ink wetting agents can adjust the drying speed of water-based ink according to different printing processes and substrate characteristics.

It can form hydrogen bonds and other interactions with water molecules to slow down the volatilization of water, thereby controlling the drying speed of water-based ink. In some occasions where high-speed printing is required, by adding an appropriate amount of wetting agent, the open time of water-based ink can be extended, so that the printing press can run at a higher speed while ensuring quality. In some processes that require higher drying speeds, wetting agents that promote drying can be selected to speed up the drying speed of water-based ink and improve production efficiency.

Enhance adhesion and ensure the durability of printed products

Good adhesion is an important guarantee for the quality of printed products. Water-based ink wetting agents can enhance the adhesion between water-based ink and the substrate, making the printed pattern more firm and less likely to fall off. It can form chemical bonds by chemically reacting with the active groups on the surface of the substrate, thereby improving adhesion.

For some substrates with smooth surfaces or special properties, such as glass and metal, the role of ink wetting agent is particularly important. It can help ink better penetrate into the tiny pores on the surface of the substrate, forming a mechanical fit and further enhancing adhesion. In this way, the printed matter can maintain good printing effects even if it is affected by external factors such as friction and washing during long-term use.

Promote resource recycling and reduce production costs

During the printing process, some waste and residual ink are inevitable. The use of ink wetting agent can promote the recycling and reuse of these waste and residual ink. Since ink wetting agent can improve the performance of ink, the recycled ink can still maintain good printing effects after re-adjustment, thereby reducing the waste of raw materials and reducing production costs.

At the same time, the use of ink wetting agent can also reduce waste liquid discharge during printing and reduce pollution to the environment. Some environmentally friendly ink wetting agents themselves have good biodegradability and are more environmentally friendly when dealing with waste.

Development trend of water-based ink wetting agents driven by environmental protection policies

With the continuous strengthening of environmental protection policies and the improvement of consumers' environmental awareness, the requirements for the environmental performance of water-based ink wetting agents are getting higher and higher. In the future, water-based ink wetting agents will develop in a more environmentally friendly, efficient and multifunctional direction.

On the one hand, R&D personnel will focus on developing low-VOCs or VOC-free water-based ink wetting agents to reduce pollution to the environment. On the other hand, the performance of water-based ink wetting agents will be continuously improved so that they can better adapt to the needs of various printing processes and substrates. In addition, multifunctional water-based ink wetting agents will also become a development trend, such as wetting agents with antibacterial, anti-mildew, anti-static and other functions, which will bring more added value to printed products.

Under the background of environmental protection policies, water-based ink printing is gradually becoming the mainstream development direction of the printing industry with its green advantages. As a key auxiliary agent for water-based ink printing, water-based ink wetting agents provide strong support for the green production of water-based ink printing by optimizing water-based ink performance, adjusting drying speed, and enhancing adhesion. With the continuous advancement and innovation of technology, water-based ink wetting agents will play a more important role in promoting the green development of the printing industry and help us achieve a better green future.