Page 34 - Plastcs News August 2017

FEATurES

Table 1 Compositions of waterborne model formulation Table 3 Solubility parameter of different co-solvents
Ingredients Characteristic Co-solvents Butyl Carbitol Isopropyl
Acrylate Waterborne Resin Alcohol (IPA)
Eversorb®AQ1 Blend UVA and HALS ((cal/cm^3)^1/2 9.9 11.5

Table 2 Compositions of wood pretreatments model
formulation

Ingredients Characteristic
Eversorb®SB1 Blend UVA and HALS
Aqueous
hardwoods hardwoods hardwoods softwoods softwoods
Butyl Carbitol or Isopropyl Aqueous
Alcohol (IPA) Fig.2 Different type of woods

Screening Design

creening design (Table 4) was used to identify factors that get the minimal color change after weathering test.
SMathematical model derived from data indicates all factors –X1: 5 different type of woods (Cedar, Douglas fir,
Southern beech, African Teak and Southern pine). X2: 3 type of treatments (X2-1:

Top Coat: Waterborne Acrylic Resin, X2-2: Wood Pretreatment: Butyl Carbitol mixed with EV-SB1, Top Coat: EV-AQ1
mixed with Acrylic Resin and X2-3: Wood Pretreatment: IPA mixed with EV-SB1, Top Coat: EV-AQ1 mixed with Acrylic
Resin). The Analysis of variance, parameter estimates and effect tests (as shown in table

5, table 6 and table 7).

Table 4 Details of Screening Design and Test Results

X1: 5 different X2:3 type of treatments ΔE:
type of woods X2-1:Waterborne Acrylic Resin Delta difference color

X2-2:Wood Pretreatment: Butyl Carbitol mixed with EV-SB1:Top (300h)
Coat: 2% EV-AQ1 mixed with Acrylic Resin
X2-3:Wood Pretreatment: IPA mixed with 10% EV-SB1:Top Coat: 2%
EV-AQ1 mixed with Acrylic Resin
A-1-1 Cedar X2-1 15.1
A-2-1 Cedar X2-2 11.5
A-3-1 Cedar X2-3 8.1
B-1-1 Douglas fir X2-1 23.9
B-2-1 Douglas fir X2-2 14.5
B-3-1 Douglas fir X2-3 11.3
C-1-1 Southern beech X2-1 8.5
C-2-1 Southern beech X2-2 4.1
C-3-1 Southern beech X2-3 2.5

Plastics News | August 2017 34