Advantages of Silyl-Terminated Polyacrylate (NTP) Sealant

A silyl-terminated polyacrylate was mixed with fillers, plasticizers, heat stabilizers, light stabilizers, UV absorbers, silane coupling agents, and hardening catalysts. This mixed material, referred to as NTP sealant, was used in all the tests reported in this paper.

FIG. 4—Curing mechanism of NTP.

TABLH 1—Properties of commercial sealants studied.

NTP"

ACRb

PUC

STPEd

SR"

Viscosity

1 ipm

Pas

I960

1440

3010

2060

2820

2 rpm

1100

1060

1960

1130

1690

10 rpm

400

470

760

320

580

Skin formation time

min

85

8

>300

25

6

Tensile strength by

M50

MPa

0.16

0.35

0.48

0.33

dumbbellf

M100

0.32

0.59

0.73

0.48

Tb

0.92

0.16

1.20

1.45

1.85

lib

%

40

300

380

480

Yelechelic polyaerylatc scalaal (xilyl-terminaied polyaerylale sealant). bCommercial water-borne acrylic sealant.

‘Commercial polyurethane sealant.

‘‘Commercial silyl-terminatetl polyether sealant.

‘Commercial silicone sealant.

fM50: Modulus at 50 ‘/< elongation. MIOO: Modulus at MX) ‘/< elongation, Tb: Tensile strength at break, Eh: Elongation at break.