studies of pre-treatment in varied wood with high ......g=5 3 Δe=1.2 g=75 Δe=13.1 g=53 Δe=2 g=83...

Studies of Pre-treatment in varied Wood

with High Performance Light Stabilizers

Ray SungTechnical Service Asst. Manager,

Specialty Chemicals BU, Everlight Chemical Industrial Corp.

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Outline

• Why There Is A Need for Light Stabilizers

• Challenges in Waterborne System

• The Total Solution of Wood Coatings

Why Use Light Stabilizer for Wood ?

• Wood is composed of lignin, cellulose and hemicelluloses.

• Waterborne clear coating is there to protect the wood substrate from

sunlight and moisture.

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Wood Substrate

WB clear coat

WB wood coating light stabilizers

EV- AQ Series

Enhanced Color & Gloss Retention of PU

Waterborne Clear Wood Coatings

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Resin : Polyurethane(PU) Waterborne Clear Coating

Test Methods : ASTM G154-2 (Q-U-V with UVB-313 light bulb )

Exposure Time : 100 hours

ΔE=13.1G=5

3

ΔE=1.2

G=75ΔE=13.1

G=53

ΔE=2

G=83 After Test

Before Test

Fig.2-1 Delta difference color (ΔE) Fig.2-2 60o Gloss

0 2 4 6 8 10 12 14 16difference color (ΔE)

20 30 40 50 60 70 80 90 100

60o Gloss

Control

3%Eversorb AQ1

Fig.1 Delta difference color (ΔE) Fig.2 60° Gloss

3%Eversorb AQ3

13.1

2

1.2

90

53

83

75

Original

For color retention:

EV-AQ3 is better than EV-AQ1For gloss retention:

EV-AQ1 is better than EV-AQ3

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Eversorb® AQ Seriesfor Waterborne Coatings

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Eversorb® AQ1 is Recommended

for Waterborne System

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(5g UVA /100g Waterborne Resin)

filter

Conventional UVA could NOT be

dispersed in waterborne resin

(5g EV-AQ1 /100g Waterborne Resin)

filter

Liquid EV-AQ1 is easily dispersed in

waterborne resin

Eversorb® AQ1 Keeps it Clear !

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(10g EV-AQ1 /100g –DI Water)

Stirring

(10g UVA /100g –DI Water)

Stirring

Liquid EV-AQ1 specific for

high clarity waterborne formulation

Why Use Light Stabilizer for Wood ?

• Wood is composed of lignin, cellulose and hemicelluloses.

• Lignin, when exposed to the sunlight, can easily be degraded.

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Degradation of ligin

Wood Substrate

WB clear coat

WB wood coating light stabilizers

EV- AQ Series

Degradation of Lignin

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Total solution for Lignin

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Wood Pretreament

Eversorb® SB1Eversorb® AQ1

in Clear Coat

Total Solution of Light Stabilizers

for Wood Products

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Wood Substrate

WB clear coat

WB wood coating light stabilizers

EV- AQ Series

WB wood pretreatment

EV- SB Series

Surface coat

Design of Experiment (DOE)

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Design of Experiment (DOE)

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Eversorb® SB1 for wood treatment

Effect of solvent and wood types

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Cedar

Solvent Butyl Carbitol Isopropyl alcohol

Solubility parameter

((cal/cm^3)^1/2 )9.9 11.5

Southern beech African Teak Douglas fir Southern pine

hardwoods hardwoods softwoods softwoodshardwoods

The effect of Southern pine coated with

acrylic resin after weathering for 300 hrs

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(Prediction Profiler)

Eversorb® SB1 for wood treatment- Effect of solvent and wood types

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Douglas fir

Southern pine

Cedar

Eversorb® SB1 for wood treatment- Effect of solvent and wood types

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Southern beech

African Teak

Conclusions: IPA is a very good solvent;

More effect on treating soft woods.

Eversorb® SB1

Waterborne Wood Pretreatment

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- Enhanced Color Retention for Wood

Resin: Acrylic(AC) Emulsion Clear Coating(VONCOAT SAT-177) Application: SprayFilm Thickness: 30 microns Exposure Unit : Q-U-V with UVB-340 light bulbTest Methods: ASTM G154-1Exposure Time: 300 hours

Blank

2% EV-AQ1 +10% EV-SB1 pretreatment

ΔY=29.2 ΔY=3.6

2% Eversorb-AQ1 in top coat

over 10% Eversorb-SB1 pretreatment (on Southern Pine)

ΔY=16.2

10% EV-SB1 pretreatment 2% EV-AQ1

ΔY=9.5

Conclusions

• AQ1 is easy to disperse in waterborne coatings

and meet the requirements.

• 10% SB1 in IPA is good for the pretreatment to

softwoods.

• Using AQ1 and SB1 together can give you

synergistic performance.

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Everlight Chemical Profile

• Founded in 1972 in Taiwan

• Listed in Taiwan Stock Exchange since 1988(Stock code: 1711)

• Revenue: USD $330M (2018)

• 5 Business Units:

1,900Employees

17Offices

6Production Sites

Charlotte

Rotterdam

Mersin

Tianjin

Qingdao

Shanghai

Suzhou

Guangzhou

Zhuhai

Hong Kong

Taipei (HQ)

Suzhou

Taoyuan (4)

Hsinchu

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Publications

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Eversorb® in Everyday Life!

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https://everlight-uva.com/

Premium UV Absorbers & Light Stabilizers

Italian Distributor

B.A. Special Chem & Color S.r.l.

Contact: Mr. Luca Bonannobonanno@bacolor.it

Thank You!