Quantitative characterization method of adhesive force of organic silicon resin transparent coating

Abstract

The invention relates to a testing method of an adhesive force, in particular to a quantitative characterization method of the adhesive force of an organic silicon resin transparent coating. The quantitative characterization method is suitable for detecting the adhesive force of a plastic surface organic silicon resin coating system and comprises the following operation steps: firstly, uniformly coating a plastic substrate with paint, and curing the coating system; secondly, carrying out sand papering and pretreatment on the surface of the coating, and then directly adhering a test column on the surface of the coating by using a proper adhesive; thirdly, after the adhesive is cured, increasing tensile force at uniform velocity by using a tensile machine, and measuring tensile force required by damaging the adhesion of a coating / substrate interface. According to the quantitative characterization method disclosed by the invention, a damaging surface during a pull-off test is only a contacting surface of the coating / substrate by using an AB type epoxy resin adhesive and surface pretreatment of the coating, complete falling of the coating in the test column area is realized, and checking of the falling area of the coating is avoided; data dispersity is small, the adhesive effect of the coating can be evaluated comprehensively and accurately, and the accuracy and the reproducibility of data testing are improved.

Description

technical field [0001] The invention relates to an adhesion test method, in particular to a quantitative characterization method for the adhesion of a silicone resin transparent coating. Background technique [0002] Compared with optical glass, optical plastic has the characteristics of impact resistance, small specific gravity, easy processing and low price, but plastic has the characteristics of wear resistance and poor solvent resistance. At present, coating transparent protective coatings on the surface of polycarbonate, plexiglass and other optical plastics is an important direction for the application of optical plastics, and the adhesion between the coating and the substrate is directly related to the service life and safety of the material. [0003] At present, the cross-cut method and the circle method are generally used to test the adhesion of optical plastic surface coatings. The national standard GB9286-1998 stipulates the method of measuring the adhesion of the...

AI Technical Summary

Problems solved by technology

However, there are many factors affecting the operation of this method at present. The surface failure form after pulling apart is likely to occur at the interface of the adhesive / coating or adhesive / test column, and the test data cannot accurately reflect the relationship between the coating / substrate. For different coating systems, it is necessary to optimize the operation process to achieve adhesion failure between the coating / substrate during the pull-off process

The transparent protective coating on optical surfaces such as polycarbonate and plexiglass is relatively thin (generally less than 20 μm), and silicone resin is mainly used as the protective coating. The coating is transparent, the surface is very smooth and the surface energy is very low, resulting in a Adhesive properties between commonly used adhesives such as polystyrene or polyurethane are poor, and adhesion damage between the adhesive and the coating is prone to occur when the adhesive is pulled apart, and the coating adhesion cannot be accurately characterized.

Images