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Table 3: Assignment of (1)H NMR and chemical shift of WBPU Assignment Chemical shift (ppm) NH(Ut) 7.
The PTMG-based WBPU exhibited the maximum tensile strength and the Young's modulus among all of the samples.
Figure 5 shows the XPS survey scan of WBPU and WBPSUU.
Table 4: Relative peak area (%) contribution of various carbon functional groups evaluated from XPS Sample C-H/C-C C-N C-0 C=0 C-Si WBPU 62.
Seawater-immersion test of pure WBPU and WBPSUU coatings were carried out to confirm the antifouling property depending on the PDMS contents.
Table 5: Fouled area of coated samples after immersion in sea water using WBPU and WBPSUU dispersions Immersion days Fouled area (%) WBPU WBPSUU1 WBPSUU2 WBPSUU3 WBPSUU4 WBPSUU5 30 78 77 76 73 2 2 60 96 88 85 81 3 4 90 99 97 91 88 5 6
The IR spectrum of SAE with silicone monomer 3%, a hydroxyl value of 100 mg KON/g and the IR spectrum of 2K WBPU film were prepared from the above emulsion the Rhodocoat WT2102 with an-NCO/OH ration = 1.
Table 2: Effect of silicone-monomer level in silicone-modified acrylic emulsion (SAE) on the properties of 2K WBPU coatings Content of silicone-monomer 0 1.
Two SEN photographs of 2K WBPU coatings consisting of SAE and hydrophilic modified polyisoeyanate Rhodocoat WT 2102 with and NCO/OH ratio of 1.
Figure 3 illustrates the TG-DSC curves of SAE (a), the 2K WBPU costing film consisting of SAE and curing agent Rhodocoat WT 2102 (b), the 2K WBPU coating film composed of the commonly used acrylic emulsion and curing agent Rhodocoat WT 2102(c), when NCO/OH = 1.
The silicone modification of the acrylic emulsion improved the properties of the resultant 2K WBPU paint.