There are several apparently damaging methods on the surface of a plastic product, where there are scratches of sharp objects; abrasion caused by abrasive friction; surface damage to surface or glossy surface damage; or a "write effect" caused by a slight scratch of the passivated object.
At present, many parts of the automotive industry involve thermoplastic elastomers, such as dashboards, bumper (cover), wiper, airbag cover, anti-rubbing, etc., in the application of these elastomer materials at the same time, encounter their scratch resistance Not very good to meet the requirements.According to Dr. Ashu Sharma, a senior researcher at Ciba Specialty Chemicals, the material is yielded under the action of a press force and a sliding force or a lateral (lateral) force, resulting in ductile / brittle damage causing scratches. In scratches, the uneven surface produces uneven light scattering and "scratches".
Solutions to improve scratch performance include minimizing the roughness of the polymer's bottom surface and reducing the scratches of the shoulder to produce as little light scattering as possible and as small scratches as possible. Accurate measurement of scratch resistance, to understand the surface damage behind the material scientific knowledge for the formation of improvement programs is important.
There are several test methods for detecting surface damage. One is a five-finger scratch test, which is based on experience comparing scratches visibility after different load scratches, and US auto OEMs often require this approach.
