Initial adhesion & adhesion of the coating film adhesive layer
In addition to the substrate and coating, the invisible car clothing also has a very important layer of structure - the adhesive layer. Although the adhesive layer does not provide protective properties, the quality of the adhesive layer is directly related to the service life of the car coating film. Inferior glue is not only more difficult in construction, easy to warp, and even in the process of use, there will be a phenomenon of peeling, falling off the glue, and damaging the car paint. How to judge the quality of the invisible car coat adhesive layer? Is the stickier the better? This involves the balance of initial tackle and adhesion.
As the lowest layer, the adhesive layer is in direct contact with the car paint and plays the role of connecting the car paint and the substrate. At present, the mainstream car clothing in the market is acrylic glue, which is a pressure-sensitive adhesive with low initial tack and high stickiness.
In the use of pressure-sensitive adhesives, the main performance of the performance includes adhesion and detack, initial adhesion and adhesion are important evaluation indicators of pressure-sensitive adhesives, and the two are inversely proportional.
Initial tack refers to the adhesion generated by pressure-sensitive adhesive in a very short period of time after being pressurized. A very strong bond is indicated when a very strong bond can be produced with very little pressure and a short period of contact.
The initial adhesion determines whether the construction personnel can repeatedly construct and present a perfect construction effect. The car has a lot of arcs and corners, so the invisible car coat is easy for the construction personnel to deviate when it is installed, which requires the car coating film to be moved on the car paint and can be repeatedly constructed, and the greater the initial adhesion, the worse the workability of the car coating film.
In the process of installing and pasting invisible car clothing, construction personnel often spray the installation fluid first and then paste the film, and the installation fluid plays a lubricating role at this time, which is convenient for moving after the alignment is not accurate.
Does low tack affect the firmness after mounting? The answer is no. This brings us to stickiness.
Adhesion refers to the ability of pressure-sensitive adhesive to continue to resist persistent shear creep damage after sticking to an object. The stronger the stickiness, the better the adhesion of the car coating film and the less easy it will fall off. Once the invisible car is attached to the car, the fit will strengthen over time as moisture evaporates and air is lost. Adhesion often represents whether there will be problems such as warping after the invisible car is mounted.
Just after pasting the invisible car coat, the adhesion between the car coating film and the car paint is not high, so it will generally be placed for about half a day after the paste and then notify the owner, and the staff will also remind the owner not to pull the car coat a few days ago, do not use a high-pressure water gun to wash the car, do not go on the highway, etc., to a certain extent, because of the low initial adhesion, the car coating film needs enough time to improve the viscosity.
Therefore, a high-quality adhesive line needs to achieve a balance between initial tack and stickiness. Invisible car clothing manufacturers need different adhesive formulas to match different substrate materials, which requires repeated trials and tests to be easy to construct and not easy to rise.
