Page 31 - Plastcs News August 2017

FEATurES

The Pre-treatment Study of Varied Woods with High Performance
Light Stabilizers

By

Yung-Chi Yang, Yu-Shu Sung , Miles Hsieh, Yin-Ting Lai, Chung-Han Lu, Hsiao-Fang Chiu,
Chih-Hsien Chein, and Dr.Yao-Hsing Huang
ABSTRACT

ignin, when exposed to the sunlight, can easily be wood with and without SB-1 pre-treatment in different
Ldegraded. To preserve the beauty of wood grain, UV co-solvents. Design of Experiment (DoE) was used in this
absorber and light stabilizer containing waterborne clear study. Our data confirmed that pre-treatment is better
coats are commonly applied to the surface for protection. than not pre-treatment from UV light degradation. Lignin
However, the effectiveness of such application is limited. is a complex organic polymers. The functional group
According to our studies, pre-treatment of varied wood contains hydroxyl groups (-oH). Two types of co-solvents
surface prior to the application of clear top coat can are tested in this system, the solubility parameter of
effectively extend the protection of lignin from UV light isopropyl alcohol is 11.5 and butyl carbitol is 9.9. After
degradation. weathering Test, SB-1 mixed with isopropyl alcohol is
better than butyl carbitol. The softwoods contain 25–35%
Eversorb AQ-1, a blend of UV absorber and HALS, is lignin and hardwoods contain 18–25% lignin. Theory, SB-1
developed by Everlight Chemical Industrial Corporation pre-treatment is significant to protect softwoods. Data
(ECIC) specifically for waterborne clear coats.
indicates that pre-treatment with SB-1 in softwoods
Eversorb SB1, designed for wood pretreatments, can (Southern Pine and Douglas fir) are significant effect than
protect lignin from UV light degradation. This paper is hardwoods (Cedar, Southern beech and African Teak).
a comparison study in accelerated weathering of varied

31 Aug ust 2017 | Plastics News