Production process for alpha-cyanoethyl acrylate adhesive
A production process technology of ethyl cyanoacrylate, which is applied in the field of production process of α-ethyl cyanoacrylate adhesive, can solve the problem of low stability of α-ethyl cyanoacrylate adhesive, and achieve easy trace moisture, Thoroughly dehydrated and easy to remove
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Embodiment 1
[0049] 1. Synthesis: After converting 110g of 93% solid formaldehyde imported from Spain into water, add 320g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.4mL of pyridine at 30°C, and control the temperature At about 50°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.
[0050] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 40g of dioctyl ester, 8g of disulfur pentoxide, and 4g of hydroquinone, and finally add 10 drops of strong acid to the bo...
Embodiment 2
[0055] 1. Synthesis: After converting 112g of 93% solid formaldehyde imported from Spain into water, add 320g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.6mL of pyridine at 30°C, and control the temperature At about 60°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.
[0056] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 40g of dioctyl ester, 8g of disulfur pentoxide, and 4g of hydroquinone, and finally add 10 drops of strong acid to the bo...
Embodiment 3
[0061] 1. Synthesis: After converting 110g of 93% solid formaldehyde imported from Spain into water, add 400g of solvent 1,2-dichloroethane, and start to drop a mixture of 400g of ethyl cyanoacetate and 1.4mL of pyridine at 30°C, and control the temperature At about 50°C, after 1.5 hours of dropwise addition, use an electric heating pot to raise the temperature to 70°C and start to keep warm for 2 hours. After the heat preservation is completed, add 6g of phosphoric acid, stir for 15 minutes, and stand still for stratification.
[0062] 2. Dehydration: After adding the solvent 1,2-dichloroethane from the bottom of the reactor again, start to heat up, and start to produce monomer at 68°C, and then heat up to 120°C after the solvent in the condenser tube and the bottle is removed. Turn on the vacuum drawing, and after the drawing is completed, add a mixture of 50g of dioctyl ester, 10g of disulfur pentoxide, and 5g of hydroquinone, and finally add 10 drops of strong acid to the b...
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