Method for preparing novel F level high speed polyurethane enamelled wire paint
A polyurethane varnish and wire varnish technology, applied in polyurea/polyurethane coatings, cable/conductor manufacturing, electrical components, etc., can solve problems such as low pass rate, unstable batch quality of enameled wire varnish, and salt water pinholes, etc., to achieve Effects of improving heat resistance and mechanical properties, promoting smooth reaction, and reducing raw material costs
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Embodiment 1
[0071] Step 1, the preparation of disubstituted aromatic dihydric alcohols:
[0072] 17 kg of terephthalic acid, 34 kg of neopentyl glycol, and 0.08 kg of organic titanium-antimony composite catalyst are reacted at 130°C-150°C for about 3 hours to produce 46-47 kg of disubstituted aromatic diols. Aromatic dihydric alcohol is a colorless transparent solution above the melting point, its melting point is 45°C-50°C, its hydroxyl value is 540, and its acid value is 2.8.
[0073] Step 2, the synthesis of hydroxyl component:
[0074] 47 kg of disubstituted aromatic dihydric alcohols, 95 kg of phthalic anhydride, 24 kg of adipic acid, 24 kg of tris (α-hydroxyethyl) isocyanurate, 24 kg of glycerin, and 95 kg of neopentyl glycol 1 kg of organotitanium-antimony composite catalyst and 10 kg of xylene were added to the reaction kettle in sequence. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C and maintain it for 2 hours; then react at...
Embodiment 2
[0080] Step 1. Preparation of double-substituted aromatic diols
[0081] 20 kg of terephthalic acid, 90 kg of neopentyl glycol, 0.22 kg of organic titanium-antimony composite catalyst, and 104 to 105 kg of di-substituted aromatic diols can be generated by reacting at 130℃-150℃ for about 3 hours. The aromatic diol is a colorless and transparent solution above the melting point, its melting point is 41°C-45°C, the hydroxyl value is 759, and the acid value is 1.8.
[0082] Step 2. Synthesis of hydroxyl components
[0083] 50 kg of di-substituted aromatic diols, 250 kg of phthalic anhydride, 70 kg of adipic acid, 100 kg of tris(α-hydroxyethyl) isocyanurate, 50 kg of glycerin, and 270 kg of neopentyl glycol , 5 kg of organic titanium-antimony composite catalyst and 40 kg of xylene were successively added to the reaction kettle. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C for 2 hours; then react at 195°C to 200°C for 1 hour; s...
Embodiment 3
[0089] Step 1. Preparation of double-substituted aromatic diols
[0090] 10 kg of terephthalic acid, 45 kg of 2-methyl-1, 3-propanediol, 0.15 kg of organic titanium-antimony composite catalyst, and reacted at 130℃-150℃ for about 3 hours to generate double-substituted aromatic diol 47 ~48kg, the disubstituted aromatic diol is a colorless and transparent solution above the melting point, its melting point is 40°C-45°C, the hydroxyl value is 760, and the acid value is 1.7.
[0091] Step 2. Synthesis of hydroxyl components
[0092] 40 kg of di-substituted aromatic diols, 230 kg of phthalic anhydride, 50 kg of adipic acid, 80 kg of tris(α-hydroxyethyl) isocyanurate, 1,1,1-trimethylol 45 kilograms of propane, 240 kilograms of 2-methyl-1,3-propanediol, 3 kilograms of organic titanium-antimony composite catalyst and 35 kilograms of xylene were successively added to the reaction kettle. Start the heating device, react at 140°C to 180°C for 3 hours; then raise the temperature to 190°C...
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