Electric insulation polyurethane resin composition and electric or electronic parts

A technology of polyurethane resin and electrical insulation, which is applied in the field of electrical or electronic components and electrical insulating polyurethane resin composition, which can solve the problems of polyurethane resin water resistance and low heat and humidity resistance, and achieve excellent electrical insulation and transparency Good results

Inactive Publication Date: 2003-04-09
DAI ICHI KOGYO SEIYAKU CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, phosphorus-based flame retardants are more easily hydrolyzed than halogen-based flame retardants, and after decomposition, strong acid phosphoric acid is produced.
Phosphoric acid produced causes certain problems and hydrolyzes the urethane resin, resulting in a decrease in the water resistance

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Example Embodiment

[0048] Example 1

[0049] 30 g of diphenylmethane diisocyanate (NCO=33.6 mol%), 0.05 g of calcium hydroxide and tris(cresyl phosphate) were mixed with 100 g of polyester polyol (hydroxyl value of about 160 mg KOH / g) of glyceryl ricinoleate ) 20 g were mixed, degassed, and the resulting mixture was placed in a 60°C thermostat for 1 hour to solidify.

[0050] The volume intrinsic resistance value, moist heat resistance and flame retardancy of the obtained cured product were measured. The results are shown in Table 1. Comparative Example 1

Example

[0053] Examples 2 to 9

[0054] A cured product was obtained in the same manner as in Example 1 except that the amounts of calcium hydroxide and tris(cresyl phosphate) were changed as shown in Table 1.

[0055]

[0056] As clearly shown in Table 1, the cured products obtained in Examples 1 to 9 did not impair their electrical insulating properties and flame retardancy, and had improved heat and humidity resistance. Examples 10 to 12

Example

12

[0057] Example number

[0058] Example number

[0059] As described above, the present invention provides an electrically insulating urethane resin composition which is excellent in flame retardancy and hydrolysis resistance and is less likely to cause environmental problems. In addition, since the electrical and electronic parts of the present invention are encapsulated with the electrically insulating polyurethane resin composition having the above advantages, they are excellent in moisture resistance, especially moisture and heat resistance, and are suitable for use as washing machines, toilet seats, water heaters, and water purifiers and other electrical and electronic components.

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PUM

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Abstract

To obtain an electrically insulating polyurethane resin composition having excellent flame retardance and resistance against hydrolysis, and having little possibility to cause environmental problems. The electrically insulating polyurethane resin composition comprises an electrically insulating polyurethane resin, a halogen-free phosphorus type flame retarder, and at least one type agent for preventing hydrolysis selected from the group consisting of a metal hydroxide, a metal oxide and a metal carbonate.

Description

field of invention [0001] The present invention relates to an electrically insulating polyurethane resin composition and electric or electronic parts using the same. Specifically, it relates to an electrically insulating polyurethane resin composition having excellent electrical insulating properties, flame retardancy, and hydrolysis resistance, and electric or electronic parts using the electrically insulating polyurethane resin composition. Background technique [0002] Polyurethane resins can be used in various applications, ranging from low-hardness rubber-like elastics to high-crosslinking-density hard resins, by selecting their raw material polyols and polyisocyanates. In particular, it is widely used as a material for electrical insulation because of its excellent heating cycle and operability, low dielectric constant and other properties. [0003] However, in recent years, flame-retardant materials are required from the perspective of fire prevention, especially ele...

Claims

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Application Information

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IPC IPC(8): C08L75/04C08K3/18C08K3/32C08K5/521H01B1/12H01B3/00H01B3/30
Inventor 尾村隆夫末永茂繁中望
Owner DAI ICHI KOGYO SEIYAKU CO LTD
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