Polyamide-imide coating material and insulated wire using the same
A polyamide-imide and polyamide-imide resin technology, which is used in insulated cables, plastic/resin/wax insulators, insulated conductors, etc. Effect of improving coating workability
Inactive Publication Date: 2014-08-06
HITACHI METALS LTD
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- Description
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- Application Information
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Problems solved by technology
However, if the molecular weight is increased, the viscosity will increase, and when the paint absorbs water due to exposure to the atmosphere, whitening (curing, precipitation) of the resin will easily occur, and there is a possibility that the coating property of the paint will be greatly reduced.
[0007] As a countermeasure, it is conceivable to reduce the concentration of non-volatile components, but in this case, the amount of solvent contained in the polyamide-imide paint increases, and therefore costs
In addition, in order to obtain the same thickness of the film, the number of times to apply the polyamide-imide coating will increase, so the manufacturing cost will also increase
Method used
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Embodiment Construction
[0129] Prepare a flask equipped with a stirrer, a nitrogen inflow tube, a thermometer, and a cooling tube. As the first-stage synthesis reaction, 525.7 g of trimellitic anhydride (TMA) and 8.8 g of methanol (MeOH) were dissolved in N-methyl-2-pyrrolidone (NMP ) 1167.4g, polymerized at 60°C for 2 hours. Afterwards, 698.6 g of 4,4'-diphenylmethane diisocyanate (MDI) was put in, reacted at 140°C for 2 hours, reacted at 150°C for 1 hour, and further polymerized at 160°C for 1 hour, thereby producing a compound containing the general formula (1 ) represents the chemical structure of the resin. Thereafter, the reaction solution in the flask was cooled, and 30.0 g of benzyl alcohol for capping the end of the produced resin and 291.9 g of N,N-dimethylformamide (DMF) as a diluting solvent were added to obtain an implementation The polyamideimide coating of Example 1. The molar ratio of trimellitic anhydride (TMA), methanol (MeOH), and 4,4'-diphenylmethane diisocyanate (MDI) in Exampl...
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Abstract
The invention provides a polyamide-imide coating material and an insulated wire using the polyamide-imide coating material. The polyamide-imide coating material allows a coating film having good appearance and mechanical characteristics to be formed, is more highly concentrated while having a low viscosity allowing coating workability to be significantly improved, does not require a refining process and thus allows low-cost production. In the polyamide-imide coating material of the present embodiment, a polyamide-imide resin having a repeating unit of a chemical structure represented by the following general formula (1) in a molecular chain is dissolved in a solvent. The formula (1) is defined in the description.
Description
technical field [0001] The present invention relates to a polyamide-imide coating and an insulated wire using the same. Background technique [0002] Polyamide-imide paint is a heat-resistant polymer resin exhibiting excellent properties such as heat resistance, mechanical properties, and hydrolysis resistance, and it is known to have a film formed by applying and baking this polyamide-imide paint ( insulation film) insulated wire. [0003] As a manufacturing method of a polyamide-imide coating material, the isocyanate method, an acid chloride method, etc. are known, for example. [0004] In the acid chloride method, tricarboxylic acid chloride and diamine are synthesized as main components, and therefore, when the synthesized polyamide-imide coating is applied and baked, chlorine residues remain in the film. Therefore, a purification process for removing chlorine residues is required, which is costly, and chlorine residues remain after purification, so it is not suitable ...
Claims
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IPC IPC(8): C09D179/08C09D5/25C08G73/14H01B3/30H01B7/02
CPCH01B3/303Y10T428/2933
Inventor 牛渡刚真锅岛秀太船山泰弘本田佑树菊池英行
Owner HITACHI METALS LTD