Page 40 - Plastics News October 2016
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FEATURES
Yellowness index 1000 hrs. Delta color difference ( E) 1000 hrs. physical
(Yi ) physical properties properties
0 24 500 1000 Tensile strength Elongation 0 24 500 1000 Tensile Elongation
hr hrs hrs hrs retention (%) (%) hr hrs hrs hrs strength (%)
Blank 2.25 31.41 Decomposed Decomposed retention (%)
2% Ev. HP1 2.48 2.57 8.72 28.24 72.09 75.68 1 phr Ev. Hp1 0 1.06 1.43 1.8 70.45 62.62
4% Ev. HP1 2.58 2.61 7.67 24.27 99.91 99.48 2 phr Ev.Hp1 0 0.71 0.66 1.3 71.67 63.94
(table 3) (table 4
STPE transparent sealant without UV stabilization in QUV )
test will turn yellow and decompose very quickly less than
100 hours (Figure 3). But adding Eversorb HP1 2,4% can
well protect STPE selant not to be decomposed and keep
color retentention.(Figure 4).
(Figure 3) Blank STPE sealant decomposed by times (Figure 5) Performance of grey STPE sealant with Ev. HP1
(Figure 4) Performance of STPE sealant with Eversorb HP1 Adding 1phr,2phr Ev.HP1 in STPE grey sealant is slightly
2. QUV exposure test result for grey STPE sealant different in color difference . Besides, adding TiO2
1 Test Sample : 2mm grey STPE sealant plate , carbon black and other filler can also decrease the
2 Measure unit: Delta color difference ( E) /Tensile impact of yellowness issue and adding Ev.HP1 can help to
maintain tensile strength and elongation retention after
strength and Elongation retention (%) QUV exposure test.
3. Criteria: ASTM G154-1(340nm UVA lamp) ;
4. Test period: 1000 hrs. ; Temperature: 50 °C Conclusions:
1. Why hybrid polymer sealant need Eversorb for
stabilization ?
Using UV light stabilization to improve the hybrid
polymer sealant further in UV stability and adhesion
after a long time outdoors exposure is necessary.
Everlight chemical provide solutions of Eversorb®
HP1 to reduce polymer degradation such as yellowing,
cracking, losing mechanical and elastic properties.
2. What is the advantages of Eversorb® HP1
Eversorb® HP1 is a high performance UV stabilizers
providing a long-term UV protection for STPE
polymers, especially those high performance sealants
for construction ,automotive and other outdoor
applications .Unlike other powder additives, its liquid
form can homogeniously incoperate in resin system
which mean you won’t need any heat up process for
incoperation and hardly concern the migration issue.
3. Our recommendation
Recommandation dosage of Eversorb HP1 is 0.5~3%
based on resin solid .Incoporating Eversorb HP1 in
resin prior to catalyst is recommended as other
catalyst might interact or interfere the system.
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