Preparation and properties of silica sol/melamine glyoxal resin

Figures & data

Table 1. Properties of MG resin modified with Silica sol.

Processing	Appearance	Viscosity/(MPa·s)	Solid content/%	Stability/d
MG	Light yellow transparent liquid	210.0	45.42	> 30
10%Silica sol/MG	Light yellow transparent liquid	58.2	42.40	> 30
20%Silica sol/MG	Light yellow transparent liquid	37.8	41.60	> 30
30%Silica sol/MG	Light yellow transparent liquid	33.6	40.24	> 30
40%Silica sol/MG	Light yellow transparent liquid	25.5	39.87	> 30
50%Silica sol/MG	Cloudy liquid	20.7	37.59	< 1

Figure 1. Particle size distribution of MG resin and modified silica sol/MG resin.

Figure 2. Infrared spectra of silica sol and KH-560 modified silica sol.

Figure 3. Infrared spectra of MG resin and modified Silica sol/MG resin.

Table 2. IR spectral data of silica sol, KH-560 modified silica sol, MG resin and silica sol/MG resin.

Group	Vibration	Silica sol (cm^−1)	Modified silica sol	MG resin	Silica sol/MG resin
O-H	Stretching	3449, 1641		3415
N-H	Stretching			3415, 1651
CH3	Asymmetric stretching		2936
CH2	Symmetric stretching		2850
C = N	Stretching			1565
C-O-C	Stretching			1242
Si-O-Si	Asymmetric stretching	1101	1101		1101
Si-OH	Bending				948
Triazine ring	Skeleton vibration			811
Si-O-Si	Symmetric stretching	796	796		811
Si-O-Si	Bending				473

Figure 4. TG(a) and DTG(b) graphs of MG resin with modified silica sol/MG resin.

Table 3. Thermogravimetric analysis of modified silica sol/MG resin.

Modified silica sol mass fraction/w%	T5%/°C	T10%/°C	Cwt/% (800 °C)
0	169.75	176.43	29.42
10	170.65	177.57	32.21
20	171.22	178.98	34.27
30	170.12	179.59	35.33
40	162.41	176.85	35.79

Figure 5. DSC curves of MG resin and modified silica sol/MG resin.