Water-based adhesives apply those things

The main emissions of VOCs in the printing industry include printing, drying, laminating and cleaning. The emissions of VOCs are closely related to printing consumables such as inks, adhesives, fountain solutions, car wash water, and thinners. Based on this, printing companies must make corresponding improvements in printing, drying, compounding and cleaning, and gradually achieve environmental protection. Green raw materials and Green printing process replacement method and organic solvent recovery technology are several methods for reducing VOCs that are currently advocated by the printing industry . Among them, the water-based adhesive is an environmentally friendly adhesive prepared by using natural polymer or synthetic polymer as a binder and water as a solvent or dispersant instead of toxic organic solvent which is polluting the environment. It has the advantages of non-toxic, non-polluting, non-combustible, safe to use, and easy to achieve clean production. Below, the author will talk about those related to water-based adhesives!

How to choose water-based adhesive

1. Fully understand the characteristics of water-based adhesives

Before choosing a water-based adhesive, you must fully understand its characteristics.

First of all, any kind of adhesive is not omnipotent. An adhesive can only be used to bond certain materials or certain types of materials. At present, water-based adhesives are mainly used for bonding between polishing paper/paper, PET/paper, BOPP/paper, PVC/paper and other substrates.

Secondly, the preparation methods and production processes of different types of water-based adhesives are different, so their chemical and physical properties are also different. Printing companies should choose according to their actual conditions. The author believes that the important application indicators of water-based adhesives mainly include four aspects: bonding strength, high/low temperature resistance, moisture resistance and holding. In practice, the sticking, the degumming, and the brittleness of the film are often caused by the above four indicators.

Again, it is necessary to understand the shortcomings of water-based adhesives, including slow drying speed, poor water resistance, poor freeze resistance, etc., for reasonable use.

2. Choose a cost-effective product

When selecting a water-based adhesive, the principle of “quality first, price second” should be adopted, and the price is expensive, which is not necessarily suitable. The author believes that when choosing a water-based adhesive, it is necessary to comprehensively consider the characteristics of the processed product and the state of the company, and choose a cost-effective product.

How to use water-based adhesive

1. Storage matters

Water-based adhesives must be stored in an indoor ventilated environment at 5 to 40 °C in the dark, protected from direct sunlight, moisture, frost, and dirt and solvents. It is recommended that the warehouse be managed by personnel who have received professional training, and a temperature and humidity meter is provided to record the temperature and humidity of the warehouse every day. If the temperature is beyond the recommended range, improvement measures should be taken in time to ensure the quality of the water-based adhesive. When used, it should be based on the principle of first in, first out to ensure the freshness of water-based adhesives.

2. Use matters

Water-based adhesives should pay attention to the following matters during the specific use.

(1) Water-based adhesive is suitable for the production of light-weight composite packaging with no irritating, volatile and destructive contents. For new product structure, special packaging and packaging conditions, it is necessary to carry out small-scale trial production before use. Mass production is required after the request.

(2) The water-based adhesive currently needs to be post-cured to promote the curing reaction of the aqueous adhesive to achieve the desired composite strength.