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Bp( ℃)
Relative volatilization rate
N-butanol
118
0.
36
N-butyl acetate
125
1.
0
Bp( ℃)
Relative volatilization rate
Bp( ℃)
Bp( ℃)
Relative volatilization rate
Relative volatilization rate
N-butanol
118
0.
36
N-butanol
N-butanol
118
118
0.
36
0.
36
36
N-butyl acetate
125
1.
0
N-butyl acetate
N-butyl acetate
125
125
1.
0
1.
0
0
(2) Relative evaporation rate
That is, select a certain solvent as the standard (usually choose n-butyl acetate, but also use ether), and set its evaporation rate as 1.
The relative evaporation rate of the solvent is defined as: t90 refers to the time required to evaporate 90% of the solvent under the specified conditions.
The reason why the time required to evaporate 90% of the total solvent is used is to avoid errors caused by the interaction between the solvent and the substrate during the evaporation process.
For example: the solvent of epoxy resin is generally 70% xylene + 30% n-butanol
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bp( ℃)
Relative volatilization rate
Toluene
111
1.
95
Xylene
135
0.
68
N-butanol
117.
1
0.
45
Isopropanol
82.
5
2.
05
bp( ℃)
Relative volatilization rate
bp( ℃)
bp( ℃)
Relative volatilization rate
Relative volatilization rate
Toluene
111
1.
95
Toluene
Toluene
111
111
1.
95
1.
95
95
Xylene
135
0.
68
Xylene
Xylene
135
135
0.
68
0.
68
68
N-butanol
117.
1
0.
45
N-butanol
N-butanol
117.
1
117.
1
1
0.
45
0.
45
45
Isopropanol
82.
5
2.
05
Isopropanol
Isopropanol
82.
5
82.
5
5
2.
05
2.
05
05
When preparing a mixed solvent, it is hoped that the relative volatilization rate of each component should be kept corresponding to the solvent composition.
If the solvent component with strong dissolving ability volatilizes faster than other components, the resin may be precipitated in the later stage of drying and particles will be generated on the surface of the coating film.
(Source: Global Coatings Network) (For more information, please log in: Global Coatings Network http:// class="info_page">