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Water-based polyurethane adhesive refers to the polyurethane dissolved in water or dispersed in water to form the adhesive, it is also known as waterborne polyurethane water-based polyurethane or water-based polyurethane. Water-based adhesive is a water-based polyurethane adhesive, generally used for film bonding.
Aqueous adhesive effect
In the printing and packaging industry in the post-press process, Fumo for printed materials to improve the brightness, enhanced water resistance. For people's life provides a good visual effect. With a variety of advanced technology, advanced equipment, advanced glues continue to emerge, India Fumo appeared some new trends.
one. With the increasing proportion of water-based laminating, oil-based adhesive close to fade out of the market.
The initial rise of domestic Fumo process, all using solvent-based adhesives. Generally one-component SIS oily and two-component polyurethane oily adhesives. With the development of science and technology, water-based adhesive gradually improve the molding, people are increasingly aware of the hazards posed by the solvent-based adhesive: A, damaging to the operator, because the benzene and esters in the solvent from the people Body surface into the human body fluids, and then into the human blood, prolonged exposure to large doses of the body caused by too much, resulting in a variety of illnesses. B, flammable and explosive, high level of hazard, resulting in heavy losses caused by the domestic frequently found. C, high cost. D to increase VOC emissions, causing environmental pollution. E, long-term residual solvent in the products, endanger the users. The aqueous adhesive successfully overcome the above shortcomings.
two. With the gradual improvement of the production process of water-based adhesive, cost performance and special properties become more prominent.
1. Application and popularity of water-based adhesive is VAE-type adhesive. The plastic brightness, cover powder ability, excellent operating performance. However, its high cost, poor adhesion, low temperature performance is poor.
2. Acrylate polymer emulsion in the plastic film in the successful stereotypes and the gradual improvement of the water-based plastic large-scale adhesive ushered in the spring. Acrylate laminating adhesive strong adhesive force, cost-effective, adaptable and successfully overcome the shortcomings of VAE-type water-based adhesive.
three. Water-based dry compound in the ascendant:
Features
With the maturity of water-based dry compound perfect, people increasingly like to use water-based glue dry compound. Although cold paste plastic machine occupies less land, less power consumption, easy to operate. However, its laminating film stiffness is poor, poor adaptability to gold and silver ink, many products fail to meet the requirements of the dry-type laminating film will certainly have broader prospects.
In addition, the water-based dry adhesive in the successful application of oily laminating machine, so for the entire industry has made an important contribution to water-based.
Using craft
1. Composite way is dry compound, that is, laminating machine to use a drying tunnel, composite roller can be heated dry laminating machine.
2. Bake temperature about 60-95 ℃ or so. Composite pressure roller temperature of about 40-70 ℃, about 8-20 kg of compound pressure.
3. It is recommended that the allowed conditions, the glue is baked to 7-9 into the dry appropriate, under such conditions, high brightness composite products, speed faster. Under such composite conditions, the temperature of the composite pressure roller should be reduced below 50 ° C to prevent bulking of the composite; the pressure should be slightly reduced so that the glue is not extruded.
4. For gold, silver and silver products or easy to change color reaction of ink and gold and silver cardboard, the glue must be completely dried.
5. In the glue is completely drying process, the pressure of the composite pressure roller does not hurt the film in the case of the higher the better, the greater the pressure the better.