Method for preparing low-free curing agent with solid content of 75% by synthesis of 65/35 toluene diisocynate (TDI)
A technology of toluene diisocyanate and curing agent, which is applied in the field of preparation of low free TDI curing agent, and can solve the problems of too many raw materials and too long process
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[0042] Example 1
[0043] (1) First add 70kg of solvent butyl acetate, then add 400kg of 65 / 35 toluene diisocyanate (T-65) to mix, and heat to 50℃;
[0044] (2) Add 0.3kg of antioxidant 2,6-di-tert-butyl-p-cresol (BHT) and ultraviolet absorber 2-(2'-hydroxy-3'5'-di-tert-butyl)-5-chloro -Benzotriazole 0.2kg, and the above mixture is heated to 60°C;
[0045] (3) Divide 103kg of trimethylolpropane (TMP) into four parts, add 20kg of the first batch of TMP and mix and then heat up to 62℃;
[0046] (4) Add the second batch of 23kg of TMP and mix and heat up to 65°C;
[0047] (5) Add the third batch of 27kg of TMP and mix and raise the temperature to 68℃;
[0048] (6) Add the fourth batch of TMP33kg and mix and raise the temperature to 70℃;
[0049] (7) After the temperature rise is over, keep it warm for half an hour, add 0.24kg of catalyst 2,4,6-tris(dimethylaminomethylphenol) (DMP), keep it for 2-3 hours;
[0050] (8) When the viscosity and NCO% reach the requirements, the reaction should be ...
Example Embodiment
[0052] Example 2
[0053] (1) First add 80kg of solvent ethyl acetate, then add 400kg of 65 / 35 toluene diisocyanate (T-65) to mix, and heat to 50℃;
[0054] (2) Add 0.3kg of antioxidant 2,6-di-tert-butyl-p-cresol (BHT) and ultraviolet absorber 2-(2'-hydroxy-3'5'-di-tert-butyl)-5-chloro -Benzotriazole 0.2kg, and the above mixture is heated to 60°C;
[0055] (3) Divide 103kg of trimethylolpropane (TMP) into four parts, add 20kg of the first batch of TMP and mix and then heat up to 65℃;
[0056] (4) Add 23kg of the second batch of TMP and mix and heat up to 68℃;
[0057] (5) Add the third batch of 27kg of TMP and mix and raise the temperature to 70℃;
[0058] (6) Add the fourth batch of 33kg of TMP and mix and raise the temperature to 75°C;
[0059] (7) Add 50kg of remaining ethyl acetate in the solvent depending on the viscosity change;
[0060] (8) After the temperature rise is over, keep it for half an hour, add 0.24kg of catalyst 2,4,6-tris(dimethylaminomethylphenol) (DMP), keep it for 2...
Example Embodiment
[0062] Example 3
[0063] Differences: 1. The chromaticity of the step-feeding product is lower, which is better than that of the traditional dripping process; 2. The viscosity of the feed from less to more is lower, which is conducive to the stable control of temperature and the controllability of the reaction process. Well, there are few by-products.
[0064] (1) Heat 1200 kg of 65 / 35 toluene diisocyanate (T-65) to 50°C;
[0065] (2) Add the antioxidant 2,6-di-tert-butyl-p-cresol (BHT) 0.9kg and the ultraviolet absorber 2-(2'-hydroxy-3'5'-di-tert-butyl)-5-chloro in sequence -0.6kg of benzotriazole, the above mixture is heated to 60°C;
[0066] (3) Divide 309kg of trimethylolpropane (TMP) into four parts, add the first batch of TMP45kg and mix and then heat up to 65℃;
[0067] (4) Add the second batch of TMP55kg and mix;
[0068] (5) Add the third batch of TMP85kg and mix it and raise the temperature to 68℃;
[0069] (6) Add the fourth batch of TMP124kg and mix and raise the temperatur...
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