Cao Dongning: Causes and Solutions for Leather Peeling
Release Time:
2018-09-27 19:53
Source:
China Laundry Information Center
According to the experience of Teacher Cao Dongning, there may be several reasons for the accident:
Improper leather surface treatment
First: The surface layer of the leather bag is sprayed with a waterproof and stain-resistant layer or uses oily materials, causing the adhesion between the coating material and the leather surface to decrease; Second: Oil stains and dust still exist on the leather surface, preventing the resin from penetrating the leather surface, resulting in poor adhesion and forming a second skin.
Solution: Effectively clean the leather surface, then further wipe with alcohol. Alcohol is a very economical and practical material in leather care; it cleans well without damaging the leather or color, and effectively improves the penetration and adhesion of the color paste.
Insufficient adhesive strength of the selected resin
The adhesive strength of the resin depends on its chemical properties and the size of the emulsion particles. When the chemical structure of the resin is fixed, finer emulsion particles result in stronger adhesion.
For leather bags, shoes, sofas, and even car seats, the requirements are more for excellent adhesion, high-quality wear resistance, wet rub resistance, high temperature resistance, and bending resistance rather than softness and smoothness. Especially for car steering wheels and seats, if cared for to be as smooth as leather clothing, it can be dangerous.
Solution: Use a primer with very good adhesion, preferably Zhihua Chemical's sofa primer or strong adhesive resin, which plays a bridging role. For the intermediate coating, use Zhihua Chemical's automotive sofa or furniture resin with good wear resistance. (Having worked in the leather care industry for decades and used many chemical materials, in comparison, Zhihua Chemical's film-forming agents and fixatives have advantages in color fastness and environmental protection, worth trying).
Inaccurate color mixing
From the accident pictures, there is already a color difference between the original color and the recolored area. Because the colors differ, more spraying and thicker layers are needed to cover, which is one of the causes of peeling.
Just like painting a wall, two coats are just right, but three or four coats will definitely cause peeling. Coloring and decorative painting share similarities.
Solution: The color must be accurately mixed to achieve no color difference, only requiring slight color adjustment, then apply a large area of gloss. This method is the best. Remember: heavy cleaning, light coloring.
Incorrect technique
Spraying while simultaneously using a heat gun to dry is also one of the causes of peeling. Sufficient time must be allowed for penetration and bonding.
Solution: After spraying, let it dry naturally in the shade to allow the resin and leather to organically bond.
Author: Cao Dongning
Deputy Director of the Leather Care Office, China Chamber of Commerce Laundry and Dyeing Committee
Vice President of Ningxia Laundry and Dyeing Association
General Manager of Pilaoda Company
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