Production method of 180-level polyurethane wire enamel

A production method and technology of polyurethane paint, applied in the direction of polyurea/polyurethane coatings, coatings, etc., can solve problems such as risks for downstream users, and achieve the effects of reducing energy consumption, controlling production costs, and protecting the environment

Active Publication Date: 2014-09-03
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The invention discloses a production method of 180-level polyurethane wire enamel; hydroxyl-surplus primary polyurethane and a polyurethane closure are used for preparing a paint, during synthesis of the hydroxyl-surplus primary polyurethane, m-cresol/p-cresol is used for dissolving 1, 4-cyclohexanedimethanol, neopentyl glycol and trimethylolpropane, then pure MDI (methylene diphenyl diisocyanate) melted and liquefied in advance is used for reaction, and then the m-cresol/p-cresol and xylene are used for dilution; when in synthesis of the polyurethane closure, first the trimethylolpropane is added, then xylenol is used to dissolve the trimethylolpropane, then under the protection of nitrogen, the liquefied MDI is added, the MDI and the trimethylolpropane first react for chain extension reaction, then the cresol and the xylene are used for dilution; the hydroxyl-surplus primary polyurethane and the polyurethane closure are used for preparing the paint in a set ratio. The 180-level polyurethane wire enamel has excellent performances of heat shock resistance and softening breakdown resistance, is energy-saving in production process, may not produce by-products which are harmful to the environment, and is conducive to environment protection.

Application Domain

Polyurea/polyurethane coatings

Technology Topic

ChemistryMethylene diphenyl diisocyanate +11


  • Experimental program(1)

Example Embodiment

[0044] Example 1
[0045] A kind of production method of 180 grade polyurethane wire enamel, the step comprises:
[0046] (1) Preparation of primary polyurethane with excess hydroxyl groups:
[0047] (1a) Raw material preparation:
[0048] 1,4-cyclohexanedimethanol: 50kg,
[0049] Neopentyl glycol: 140kg,
[0050] Trimethylolpropane: 120kg,
[0051] m/p cresol for dissolving: 400kg,
[0052] Pure MDI: 375kg,
[0053] m/p cresol: 200kg,
[0054] Xylene: 300kg;
[0055] (1b) Put 1,4-cyclohexanedimethanol, neopentyl glycol, trimethylolpropane and m-/p-cresol for dissolving into reactor A equipped with steam heating according to the set mass, and start stirring , keep the rotating speed of 50rpm, open and adjust the valve opening of the steam into the reactor A jacket, so that the material in the reactor A slowly rises to 49±2°C;
[0056] (1c) Put the steel drum packed with pure MDI in a water bath at 49±2°C, keep the temperature constant for 4 hours, then pour the molten pure MDI into reaction kettle A while it is hot, and maintain the stirring speed. During the reaction, even if the valve opening of the steam remains unchanged, the temperature of the material in the kettle will gradually rise to 135°C, and the timing will start when the temperature of the material reaches 135°C. The temperature of the material is maintained at 140±2°C and kept for 3 hours;
[0057] (1d) Add the m/p-cresol and xylene of the set mass, keep stirring for 1 hour after the addition, and wait for the material to cool down;
[0058] (2) Pump the obtained 1585kg hydroxyl-rich primary polyurethane into the dilution tank, and wait for compounding and mixing with the polyurethane sealant;
[0059] (3) Preparation of polyurethane closure:
[0060] (3a) Raw material quality preparation:
[0061] Trimethylolpropane: 100kg,
[0062] Xylenol: 1250kg,
[0063] Liquefied MDI: 650kg,
[0064] m/p cresol: 155kg,
[0065] Xylene: 460kg;
[0066] (3b) Put the trimethylolpropane and xylenol into the reaction kettle B equipped with steam heating according to the set mass, stir to dissolve the trimethylolpropane, and pass nitrogen at a flow rate of 1L/min, and put The liquefied MDI with a set quality is put into the reaction kettle B, and the valve opening of the jacket of the steam entering the reaction kettle B is increased, and the supply of steam is gradually increased, so that the temperature of the kettle is raised to 60-65°C, and the valve opening of the steam is maintained. , it will be observed that with the progress of the exothermic reaction, the temperature of the kettle continues to rise, maintain the stirring speed at 50rpm, let the temperature of the reactor B rise to 135±2℃, and then adjust the opening of the steam valve to make the material in the kettle Keep in this temperature range for 2.5h;
[0067] (3c) After the heat preservation is over, stop the nitrogen flow, add a set mass of m/p-cresol and xylene into the reaction kettle B, and maintain it at a stirring speed of 50rpm for 1h, and obtain a polyurethane sealant with a mass of 2615kg;
[0068] (4) Pump the prepared polyurethane sealer into the dilution tank filled with primary polyurethane with excess hydroxyl groups;
[0069] (5) Based on the total mass of 4200kg of primary polyurethane and polyurethane sealant with excess hydroxyl groups, add 420kg of S-100 solvent oil for dilution, 126kg of benzyl alcohol and 21kg of triethanolamine catalyst into the dilution tank, and prepare another 210kg of S-100 solvent Oil as a regulator to adjust viscosity and solid content;
[0070] (6) Divide 210kg of S-100 solvent oil for adjusting viscosity and solid content into 5 parts, and add them to the dilution kettle one by one. After each part is added, stir for 30 minutes, then take a sample to test the viscosity of the wire enamel. After adding the 4th part of S-100 type solvent oil, the viscosity of 4 cups of paint reaches 35.3s, stop adding the remaining S-100 type solvent oil, and then detect the solid content of this batch of paint, which is 30.38%, which means that The batch of products has reached the standard, and the barrel can be filled.
[0071] After coating this batch of enameled wire varnish on 0.315mm copper wire, conduct a thermal shock test at 200°C, wind the enameled wire on a round rod with a diameter of 2×0.315mm, and find that the paint film does not crack, indicating that it has passed the 200°C test. The thermal shock test has reached the requirements of the 180-level enameled wire thermal shock test. The enameled wire was wound on a round rod with a diameter of 0.315mm (that is, 1d), and when the thermal shock test was performed at a temperature of 220°C, there was no cracking of the paint film, and the test passed. This shows that the thermal shock resistance test has even surpassed the requirements of the 200-level enameled wire thermal shock resistance test. In addition, after coating the wires with this batch of enameled wire enamel, conduct a constant temperature softening breakdown resistance test at 260 ° C, the result is: no breakdown within 2 minutes, and pass. It shows that the 180-grade polyurethane wire enamel produced by this method is also excellent in softening and breakdown resistance.


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