Environmental protection is a global topic and a common focus of attention in various industries. Taking the packaging industry as an example, China's flexible packaging industry has grown rapidly in recent years, and the impact on health and environmental protection has become increasingly prominent, among which adhesives for flexible packaging have always been one of the core issues discussed. Therefore, the application prospects of environmentally friendly adhesives in this industry are very broad.
In the sense of environmental protection, environmentally friendly adhesives are divided into:
1. Solvent-free adhesive, such adhesive solvent-free volatilization will not cause environmental pollution. At present, this adhesive mainly has hot melt adhesive, which is a kind of solvent-free thermoplastic polymer (resin, rubber) as the base solid adhesive, which has rapid bonding, wide application, non-toxic, non-polluting environmentally friendly adhesive, suitable for continuous production, easy storage and transportation.
2. Water-based adhesives, which are not only adhesives with water as the dispersion medium, but also divided into water-soluble adhesives, water-dispersible adhesives and water emulsion adhesives. The advantages of water-based adhesives are: environmentally friendly, non-toxic, non-flammable, high solid content, easy to clean with existing application equipment and equipment.
3. Inorganic adhesive is a series of adhesives composed of inorganic salts, inorganic acids, inorganic alkalis and metal oxides. Inorganic adhesive is a new type of adhesive, there are many varieties, according to the curing conditions are divided into air-dry, water-set, hot melt and reactive type. Most of the inorganic glue is a paste made of a mixture of solid and liquid, and the raw materials are readily available.
Hot melt adhesive is the abbreviation of hot melt adhesive, which has the characteristics of simple sizing, rapid curing, high initial adhesion, and has the advantages of high adhesion strength and good heat resistance of reactive adhesive. At the same time, hot melt adhesive does not apply to any solvent in production and application, non-toxic, tasteless and does not pollute any environment, known as "green adhesive", especially suitable for use in continuous production lines. Therefore, hot melt adhesives are widely used in including packaging, personal hygiene products, construction, binding, labels, tapes and automotive.
Hot melt adhesive is an environmentally friendly adhesive with excellent performance, high safety and reliability, is gradually replacing traditional solvent adhesives, and the downstream application range is constantly expanding. China's hot melt adhesive industry ushered in a breakthrough after entering the 21st century, and began to enter a stage of rapid growth after early market accumulation and technology precipitation. As the main type of adhesive, hot melt adhesive has developed greatly in China, and China has now become one of the main production bases of hot melt adhesive in the world.
