Polyurethane modified with 3‐aminopropyltriethoxysilane as wool antifelting agent

Abstract

A wool antifelting agent containing polyurethane modified with 3-aminopropyltriethoxysilane (APTES) was synthesized. Firstly an isocyanate (À ÀNCO) group ended prepolymer was gained by a hydrogen shift reaction between isophorone diisocyanate (IPDI) and poly (propylene oxide triol) (PPT), and then NCO-group of the prepolymer was blocked by 3-aminopropyltriethoxysilane to form a precursor PPT-[Si(OEt) 3 ] 3 . After that a sol of the precursor was prepared for an antifelting agent. During heating the sol gelled and formed inorganic-organic hybrid film that was characterized by using FTIR and TGA. And then the wool fabric samples were treated with sol by pad-dry-cure process at different curing temperature (120, 140, and 1608C). The antifelting effects of different curing temperatures were compared. The results indicated that the new agent could endow a better antifelting effect with the low curing temperature at 1208C and 3 min.

Phase behavior, interaction and properties of acetic acid lignin-containing polyurethane films coupled with aminopropyltriethoxy silane

“…As the APTS content is greater than 4%, the intensity of hydrogen-bonded -NH decreases, while the intensity of free -NH increases. The stretching bands at ~1721, ~1709 and 1642 cm -1 are attributed to the absorption of free -C=O in urethane, hydrogen-bonded -C=O in urethane and hydrogen-bonded -C=O in urea, respectively [35][36]. The characteristic absorption of -C=O in urea at 1642 cm -1 becomes more pronounced with APTS addition, confirming the reactions between -NCO and APTS [36].…”

Oligoetherols and polyurethane foams obtained from metasilicic acid

“…There were not many efforts on obtaining silicon-modified PUFs reported, except those with organosilicon compounds [6] or silsesquioxanes [13][14][15][16] as silicon source. Using the silicon-containing oligoetherols described in our work we have obtained PUFs of increased thermal resistance and mechanical properties, as well as less flammable in comparison with classic rigid PUFs.…”

“…Silicon was determined spectrophotometrically in the form of SiO 2 after previous mineralization of oligoetherol. The 1 H-NMR spectra of products were recorded at 500 MHz Bruker UltraShield in DMSOd 6 with hexamethyldisiloxane as internal standard. IR spectra were registered on ALPHA FT-IR BRUKER spectrometer in KBr pellets or ATR technique.…”

“…The oligoetherols with phosphorus and/or silicon elements are not common substrates for polyurethane foams. On the contrary, the addition of compounds with P and/or Si elements at foaming step to get polyurethane compositions were already studied [6]. The polyetherols with Si were synthesized from R(OH) 3 triols obtained from propylene oxide (PO).…”

“…The polyetherols with Si were synthesized from R(OH) 3 triols obtained from propylene oxide (PO). PO was mixed with isophorone isocyanate at 1:3.05 molar ratio in presence of dibutyltin dilaurate and heated at 100°C to get the product terminating with isocyanate groups [6]. The isocyanate groups were then blocked with 3-aminopropyltriethoxysilane and heated to 60°C.…”