Two-component polyurethane adhesive will still dominate the market (below)

Other adhesives cannot become alternatives

Alcohol-soluble polyurethane adhesives: Prospects are not optimistic Alcohol-soluble polyurethane adhesives have been developed in recent years as ethanol-based polyurethane adhesives. Alcohol-soluble polyurethane adhesives have the following advantages.

(1) Free isocyanate free monomer improves the operating environment.
(2) It is insensitive to moisture and improves the stability and adaptability of the adhesive.
(3) Industrial alcohol as a solvent reduces production costs.
(4) Excellent compatibility with alcohol-soluble polyurethane printing inks.
(5) Composite membrane products have low residual solvents.

However, the development of alcohol-soluble polyurethane adhesives is not optimistic because although alcohol-soluble polyurethane adhesives have taken a step forward in environmental protection, it is not strictly speaking an entirely environmentally friendly adhesive because Ethanol is also an organic solvent.

In addition, at present, alcohol-soluble polyurethane adhesives are only used in the compound packaging of common dry foods. With regard to the current technology and the properties of alcohol-soluble polyurethane adhesives, it is still unable to achieve the peeling of ester-soluble polyurethane adhesives. Strength and cooking performance. Therefore, the development prospect of alcohol-soluble polyurethane adhesives is not optimistic.

Waterborne polyurethane adhesives: high cost and energy consumption

Waterborne polyurethane adhesives are prepared by dispersing a polyurethane resin in water to form an emulsion or by splicing a polyurethane resin in a hydrophilic solution in an aqueous solution. Water-based polyurethane adhesives are non-flammable, non-toxic, non-toxic to the environment, and have wide applicability to the product. However, they are still inferior to ester-soluble polyurethane adhesives in terms of composite strength and weather resistance. Cooking technology is also a problem at present. Because of its long drying time, high energy consumption and cost, it cannot be further developed under the current situation of increasing energy resources.

Therefore, although water-based polyurethane adhesives have a certain space for development, due to cost and energy consumption, they cannot replace ester-soluble polyurethane adhesives in the next 10 years.

Solvent-Free Polyurethane Adhesives: Achieve Significant Growth After 10 Years In fact, solvent-free polyurethane adhesives are truly environmentally-friendly adhesives, and solvent-free adhesives have been widely used abroad. It has the following advantages.

(1) No pollution.
(2) Solvent evaporation drying process is not required, reducing energy consumption.
(3) Composite products are free of residual solvents and reduce the risk of fire during production.

Solvent-free polyurethane adhesives are suitable for all types of plastic composite packaging. They also have a good adhesive effect for aluminum foils. The resistance to high content and high temperature cooking performance can be similar to that of ester-soluble polyurethane adhesives, with high peel strength.

In summary, in the next 10 years, alcohol-soluble polyurethane adhesives will not be developed, and water-based polyurethane adhesives will still fail to compete with ester-soluble polyurethane adhesives; after 10 years, ester-soluble polyurethanes Adhesives will be gradually reduced, water-based adhesives have a certain space for development, and solvent-free polyurethane adhesives will gradually be widely promoted in China.

Source: Print World