塑料老化试验方法.pdf

Date: 2012-09-17 GUIDE Version no: 1 Outdoor - UV protection Issued by: Magnus Ask thermoplastics Issued by Signature Authorised by Signature Replaces: Magnus Ask Senior Engineer Polymerics Guide outdoor - UV protection thermoplastics About this guide This guide gives clarity of the effect of UV radiation on thermoplastic materials for injection moulding and how to protect to a certain degree. It includes information on standardized ways to test. It also describes recommended additive recipes for our most commonly used materials and the way to document. Table of content 1. Sun light 1.1. UV light 2. Radiation 3. Effect of UV radiation 4. Additives 4.1. UV Absorbers 4.2. Light Stabilizers 4.3. UV Screeners 5. Test 6. Pigment and color stability 7. Matrix 8. Documentation 9. Reference Date: 2012-09-17 GUIDE Version no: 1 Outdoor - UV protection Issued by: Magnus Ask thermoplastics 1 Sun light Light is equal to small energy packages called photon. The composition of sunlight is: Visible light ~ 55% IR ~ 38% UV ~ 7% 1.1 UV light There are 3 different UV light, UV-A, UV-B and UV-C, distinguished by wave length. UV-A 320-400 nm, penetrates glass and can cause polymer degradation. UV-B 280-320 nm, 95% absorbed by the ozone layer, but this radiation is responsible for the majority of the polymer degradation. T