Enhanced printing and aluminum plating water-based polyester primer and preparation method thereof

Abstract

The invention discloses a water-based polyester primer for enhanced printing and aluminum plating and a preparation method thereof, belonging to the field of chemical primer preparation. The primer is composed of the following components by weight: 25-45 water-soluble polyester polyol resins, 42-70 deionized water and 5-13 cosolvents; The molecular mass is 12000-18000, the acid value is less than 2mgKOH / g, the hydroxyl value is 5-10mgKOH / g, and the glass transition temperature is 60-70°C. The primer has a solid content of 25-45 percent, a rotational viscosity of 50-200 mPa·s at 25° C. and a pH value of 4-7. The water-based primer has excellent bonding strength with the PET film, ink layer, and aluminum-coated layer. The PET printing film and PET aluminum-plated film using the water-based primer have excellent water resistance, high temperature resistance, and internal resistance. Stress shrinkage and other properties.

Description

technical field [0001] The invention relates to the field of chemical primer preparation, in particular to a water-based polyester primer capable of enhancing the adhesion of PET printing ink and aluminum plating and a preparation method thereof. Background technique [0002] Various forms of PET printing films and aluminized films are widely used in flexible packaging, hard packaging, decorative materials and other fields. These PET printing films or aluminized films often need to be bonded to another substrate through adhesives during application. This involves the bonding between three interfaces: PET film-ink layer or aluminized layer-adhesive layer-second substrate, requiring a relatively strong bond between the ink layer or aluminized layer and the PET film. High adhesion. [0003] The methods of enhanced printing and aluminum plating include corona treatment and primer treatment, among which corona treatment is the most commonly used film surface treatment method, bu...

AI Technical Summary

Problems solved by technology

In particular, some PET printing films or aluminized films that need to be laminated at high temperature will have the problem that the strength of the printed layer and the aluminized layer will decrease after lamination; and the two-component adhesive used for lamination will appear to a certain extent during the curing Shrinkage stress causes the composite film to produce the problem of decreased adhesion strength of the printing layer and the aluminized layer after curing; the reason for these problems is that the ink layer or the adhesive layer deforms during the compounding or curing process to generate internal stress, which makes the ink layer , The adhesion of the aluminum plating layer is reduced, and this problem is difficult to solve by corona treatment and ordinary primer

At present, the commonly used primers in this field have not fully met the requirements of ensuring the stable adhesion of the ink layer or the aluminized layer and the PET film in terms of adhesion, toughness, and high temperature resistance.

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