KRM 8713B

UV Resin as anti-fog

coating for Energy Curable

Coatings

v102

Content

� Introduction KRM 8713B

� Performance Highlights

� Suggested Applications

� Typical Values

� Formulation Guidelines

� Recommended formulation materials

� Coated thickness

� Drying condition

� UV curing energy

� Performance Results

� Typical properties

� Anti-fog performances

� Precautions for Use

� Recommended UV dosage for cure

� Reference formulation & results

� Improvement for the hot water resistance

Introduction KRM 8713B

Performance Highlights

Light color & Low viscosity

Excellent anti-fog property

Clear appearance

Good adhesion on plastics & glass

Vapor

Light

PC panel Anti-fog UV coating

Cloudy Clear !

Thin water layer

Introduction KRM 8713B

Suggested Applications

Plastic coatings requiring anti-fog property

For safety goggles, gauge panels,

auto motive lumps, etc.

Typical Values

Acrylated resin diluted with methoxypropanol

Color (APHA) : max. 100

Viscosity : 2500 mPa.s @ 25 ﾟC

Solids : 46%

Formulation Guidelines

For KRM 8713B 100 wt%, the suitable ratio of materials are

following;

Recommended formulation materialsMonomer : HDDA, TMPTA ~ max. 10 wt%

Oligomer : EBECRYL 8602, KRM8904 (9f-UA) ~ max. 10 wt%

Photo initiator : CPK, HMPP ~ 5 wt%

Solvent : Ethanol, IPA, Methoxypropanol, MEK as needed

Flow & leveling : BYK 361N as needed

Coated thickness10 to 20 micron after drying

Drying condition3 to 5 minutes at 80 ﾟC with convection oven or hot air dryer

UV curing energy1000 to 2000 mJ/cm2 or twice 10m/min with 120W Hg/cm lamp

Typical properties

Formulation ; KRM8713B / Irgacure184 / = 100 / 3

Coating ; 15μm thickness, bar coating on polycarbonate panel

Drying ; at 80ﾟC oven for 5 minutes

UV curing ; 1000mJ/cm2 with 120W Hg lamp

KRM 8713B Remarks

Contact angle 52ﾟ゚゚゚ with water

Adhesion on PC

on PMMA

on glass

100 / 100

100 / 100

100 / 100

1mm2 X 100 cross-

cut

Pencil hardness 2B on PC

Abrasion resistance Δhaze 30Tabor test, CS-10F,

500g, 50 cycles on PC

Solvent resistance OK MEK double rubbing

Performance Results

No coatNo coat KRM 8713BKRM 8713B

Evaluation ; PC panel against on 40ﾟC steam

Performance Results

Anti-fog performances

Performance Results

Anti-fog performances

Initial KRM 8713B Remarks

Breathing OK For 5 sec.

40ﾟC steam OK For 60 sec.

70ﾟC steam OK For 10 sec.

After 3 hrs soaking

in 60ﾟ゚゚゚C hot waterKRM 8713B Remarks

Appearance Clear

Breathing OK For 5 sec.

40ﾟC steam OK For 60 sec.

70ﾟC steam OK For 10 sec.

Performance Results

Anti-fog performances

After 10days

at 50ﾟ゚゚゚C x 95%RHKRM 8713B Remarks

Δhaze OK

Breathing OK For 5 sec.

40ﾟC steam OK For 60 sec.

70ﾟC steam OK For 10 sec.

After 10 days

at 120ﾟ゚゚゚C ovenKRM 8713B Remarks

Δb 0.2

Breathing OK For 5 sec.

40ﾟC steam OK For 60 sec.

70ﾟC steam OK For 10 sec.

UV 400 mJ/cm2 UV 1200 mJ/cm2

Precautions for Use

We recommended UV curing energy of 1000 to 2000 mJ/cm2

or twice 10 m/min with 120W Hg/cm lamp.

If UV curing was NOT enough, the film durability went down

like below photo.

Appearance after steam test

Reference formulation & results

Coating ; wet 30g/m2 by bar coating on PMMA panel

(film thickness 12-15μm)

Drying ; 80ﾟC for 5 minutes

UV curing ; Illuminance 500mW/cm2 , Intensity 1000mJ/cm2

Formulation BL ex1 ex2 ex3 ex4 ref1 ref2

KRM 8713B 100 100 100 100 100 100 100

HDDA 3 6

TMPTA 3 6

PETRA 3 6

IRGACURE 184 2.3 2.4 2.6 2.4 2.6 2.4 2.6

MMPG 11 16 21 16 21 16 21

Solids 40% 40% 40% 40% 40% 40% 40%

Improvement for the hot water resistance

Reference formulation & results

Properties BL ex1 ex2 Ex3 ex4 ref1 ref2

A-F breathing OK OK OK OK OK OK OK

A-F 40C steam

until cloud over>60sec >60sec 60sec >60sec 60sec >60sec 52sec

Soaking 90C hot

water 2hrNG NG OK NG OK NG NG

Improvement for the hot water resistance

� It was quite effective for hot water resistance to add

HDDA of TMPTA to KRM 8713B.

� We recommend to use HDDA because it has better

adhesion to the plastic substrate than TMPTA.

� To add them more, to increase water resistance but

to decrease anti-fog property. Because those

properties go against each other.

� The ideal additional ratio is around 5wt% for

KRM8713B 100wt%. For example, “ex2” formulation.

Reference formulation & results

Conclusion & Recommendation