Design novel polyhydroxyl fatty amide based on Balanites roxburgii oil and its application for coating

Figures & data

Table 1. Physico-chemical analysis of BRO, EBRO, PBRO, and FAP and poly(urethanamide).

Physico-chemical properties	BRO	EBRO	PBRO	FAP	0.75 IPDI	1.00 IPDI	0.75 BUHDI	1.00 BUHDI	0.75 HDI	1.00 HDI
Iodine value (g of I2/100 g of sample)	108.6	2.71	–	–	–	–	–	–	–	–
Saponification value (mg of KOH/g of sample)	195	–	–	–	–	–	–	–	–	–
Oxirane content (% oxirane)	–	4.5	–	–	–	–	–	–	–	–
Hydroxyl value (mg of KOH/gm of sample)	–	–	267.9	480.2	122.4	2.69	125.8	3.14	126.7	3.76
Viscosity (stokes)	0.65	3.4	17.6	46.3	–	–	–	–	–	–

Figure 1. Synthesis of PBRO.

Figure 2. Synthesis of FAP.

Figure 3. Structures of (a)BUHDI, (b) IPDI, and (c)HDI.

Figure 4. FT-IR spectra of (a) EBRO, (b) PBRO, and (c) FAP.

Figure 5. ¹H NMR spectra of FAP.

Figure 6. Gel content of poly(urethanamide) films.

Figure 7. Gloss of poly(urethanamide) coatings.

Table 2. Percent water absorption by poly(urethanamide) films of different isocyanate at 0.75 and 1 NCO to OH mole ratio.

Isocyanate	NCO to OH mole ratio	Percent water absorption
IPDI	1.00	1.677
	0.75	4.267
BUHDI	1.00	1.415
	0.75	4.103
HDI	1.00	2.965
	0.75	5.263

Figure 8. Thermogravimetric analysis of poly(urethanamide) films.

Figure 9. In vitro degradation of poly(urethanamide) films a) poly(urethanamide) of NCO to OH mole ratio 1 and b) Poly(urethanamide) of NCO to OH mole ratio 0.75.

Table 3. Mechanical properties and chemical resistance of poly(urethanamide) coatings.

Properties		NCO to OH mole ratio
		BUHDI		HDI		IPDI
		0.75	1.00	0.75	1.00	0.75	1.00
Solvent resistance (MEK rub)		500	500	500	500	500	500
Impact resistance (45 cm)	F	Pass	Pass	Pass	Pass	Fail	Fail
	R	Pass	Pass	Pass	Pass	Fail	Fail
Pencil hardness		4H	4H	4H	4H	4H	4H
Scratch hardness (kg)		3.4	3.8	3.1	3.7	3.7	4.1
Flexibility		Pass	Pass	Pass	Pass	Fail	Fail
Adhesion		4B	5B	4B	4B	5B	5B
Chemical resistance	Acid	Pass	Pass	Pass	Pass	Pass	Pass
	Alkali	Pass	Pass	Pass	Pass	Pass	Pass
	Water	Pass	Pass	Pass	Pass	Pass	Pass