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Site: Home > Related Articles > Skill of Automotive Interior Scratches Test

Skill of Automotive Interior Scratches Test

Author: Released in:2017-06-16 Click:107

Polymer materials in the field of automotive applications is very extensive, but the polymer material produced by the body prone to more serious scratching phenomenon, which makes the scratch problem has become the main object of study, this paper for the scratch of polymer materials Experimental analysis, research and analysis to improve the scratch resistance method. Here's a brief introduction:

1. Use appropriate toughening resin
    In mixed TPO, POE, EPDM, TPV (EPDM / PP) are usually used to toughen PP, and the addition of elastomer leads to a decrease in scratch resistance. Therefore, it is very important to select the appropriate elastomer, usually between them scratch resistance performance is this: TPV> EPDM> POE.

2. Use the appropriate packing
1) talc is a more conventional filler, to choose the appropriate coupling agent, the appropriate mesh.
2) The application of wollastonite has been extended from the engineering plastics to the thermoplastic elastomer, adding wollastonite, can improve the temperature resistance of thermoplastic elastomers, improve compression deformation, improve scratch resistance.
3) nano-materials, such as silica, can improve the elasticity of elastomer materials, wear resistance, scratch resistance, but choose a suitable mixing process is critical.

3. Choose the right adjuvant
1) Silicone-based additives
    Can be used Dow Corning and WACKER company's ultra-high molecular weight siloxane polymer or its masterbatch, the current domestic Sichuan dawn of silicon-based additives have also been widely used. Siloxanes do not migrate to the surface due to their high molecular weight, resulting in very good, long-term scratch resistance.
2) fluorine additive (PPA)
     At present, DuPont and 3M have mature fluoride additives to the market, these additives colorless, odorless, inert, can improve the polymer melt flow and stripping performance, speed up the extrusion rate, the most important it can Improve scratch resistance and abrasion resistance.
3) slip agent
    Such as the oleic acid amide ER, erucic acid amide VRX, when they are added to the thermoplastic, will migrate to the surface of the polymer product or frost, resulting in a wax layer, reducing the coefficient of friction while also Reduces the visibility of scratches. The disadvantage is not a real "dry", can not completely improve the surface sticky phenomenon.

4) New non-migratory surface agents
   Ciba in 2005 developed a unique anti-scratch additive Ciba IRGASURF SR 100, only need to add a small amount can greatly improve the material scratch resistance. This excellent performance additive can be used for bumper, dashboard, door panel and so on.
Skill of Automotive Interior Scratches Test
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.

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