Method for preparing line-type o-cresol novolac resin
A technology of phenolic resin and o-cresol, applied in the field of preparation of online o-cresol novolac resin, can solve the problem of wide molecular weight distribution of o-cresol novolak resin
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Embodiment 1
[0011] Embodiment 1: add o-cresol 280g and 37% formaldehyde solution 120g in the reactor, heat up and dissolve, add acidic catalyst (phosphoric acid 8g, formic acid 20g), add water to adjust the pH value of the reaction system to 3. At a reaction temperature of 90°C, react for 6 hours, add 140 g of cyclohexanone as a solvent to dissolve, wash with water to pH 6-7, and recover the solvent under reduced pressure to obtain a linear o-cresol novolac resin. The reaction conditions and product results are shown in Table 1 and Table 2, respectively.
Embodiment 2~6
[0012] Embodiments 2 to 6: The operation steps are the same as in Embodiment 1, and the reaction conditions and product results are shown in Table 1 and Table 2 respectively.
[0013] Table 1: Reaction Conditions
[0014] serial number
1#
2#
3#
4#
5#
6#
formaldehyde
37% formaldehyde
Solution 120g
Paraformaldehyde
50g
Paraformaldehyde
100g
Paraformaldehyde
50g
37% formaldehyde
Solution 120g
Paraformaldehyde
100g
o-cresol
280g
540g
180g
450g
320g
360g
catalyst
Phosphoric acid 8g
Formic acid 20g
Acetic acid
18g
Oxalic acid 0.8g
Sulfuric acid 1g
Oxalic acid
21.6g
Phosphoric acid 4g
salicylic acid
12g
p-toluene sulfonate
Acid 7.2g
catalyst plus
entry me...
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