Method for manufacturing low-viscosity hardener
AssigneeNan Ya Plastics Corporation
InventorsTe-Chao Liao, Jung-Jen Chuang, Chung-Yu Chen, Jung-Tsu Wu
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Abstract
A method for manufacturing a low-viscosity hardener is provided. The method includes the followings steps: providing a hardener crude product; and subjecting the hardener crude product and an alkaline catalyst to an isomerization reaction, so as to obtain the low-viscosity hardener. The hardener crude product contains 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride, and a weight ratio of the 3-methyltetrahydrophthalic anhydride to the 4-methyltetrahydrophthalic anhydride ranges from 7:3 to 3:7. A viscosity of the low-viscosity hardener ranges from 30 cps to 50 cps.
Claims8
A method for manufacturing a low-viscosity hardener, comprising:
- feeding maleic anhydride into a reactor;
- adding piperylene into the reactor, so that the piperylene and the maleic anhydride undergo a first addition reaction;
- adding isoprene into the reactor, so that the isoprene and the maleic anhydride undergo a second addition reaction to obtain a hardener crude product;
- wherein, when a conversion rate of the maleic anhydride is greater than 25%, the first addition reaction is complete and the isoprene is added into the reactor;
- wherein the hardener crude product contains 3-methyltetrahydrophthalic anhydride and 4-methyltetrahydrophthalic anhydride, and a weight ratio of the 3-methyltetrahydrophthalic anhydride to the 4-methyltetrahydrophthalic anhydride ranges from 7:3 to 3:7;
- and
- subjecting the hardener crude product and an alkaline catalyst to an isomerization reaction, so as to obtain the low-viscosity hardener;
- wherein a viscosity of the low-viscosity hardener ranges from 30 cps to 50 cps.
Dependencies are inferred from the claim text.