JP2007119787A - Aqueous polyurethane resin composition - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an aqueous polyurethane resin composition easy in handling, giving insulating cured products excellent in heat resistance, moist heat resistance and antirust property. <P>SOLUTION: The aqueous polyurethane resin composition comprises an aqueous dispersion obtained by dispersing a one-pack type insulating polyurethane resin in water and a triazol compound, which urethane resin is obtained by further reacting a chain-extender with an insulating urethane polymer obtained by reacting a polyol having ≤20 wt.% oxygen content and ≤155 iodine number with a polyisocianate (wherein, the one-pack type insulating polyurethane resin is compounded so that the isocyanate group of the polyisocyanate is 1.4-2.2 times equivalent based on the total of active hydrogen of the polyol and the chain extender). <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an aqueous polyurethane resin composition containing a one-component insulating polyurethane resin.

A water-based polyurethane resin composition containing a one-part insulating polyurethane resin can be selected from a rubber-like elastic body having a low hardness to a hard resin having a high crosslinking density by appropriately selecting a polyol and a polyisocyanate that are raw materials of the polyurethane resin. Insulating cured products having a wide range of hardness can be provided. Further, it is harmful to the human body and easily scatters, so it easily contaminates the work environment, and it is easy to handle because it contains almost no organic solvent that may cause a fire or explosion. Therefore, it is widely used as an insulating material for various electric / electronic parts. For example, a printed circuit board is a board in which an electric circuit is formed by a conductor such as copper on a substrate such as a plastic plate. In order to protect the electric circuit from shocks and moisture or dust present in the vicinity. It is sealed with a water-based polyurethane resin composition containing a one-component insulating polyurethane resin. (For example, see Patent Document 1)
JP-A-62-230865 (Claim 1, page 5, lower left, lines 5 to 12)

  However, in the printed circuit board having such a structure, since the electric circuit is confined in the insulating hardened material, the heat generated from the electric circuit cannot be released to the outside, and the electric circuit is protected by the heat. There is a problem that physical properties such as hardness of the insulating cured product change. In addition, even when used under high temperature and high humidity, there is also a problem that physical properties such as hardness of the insulating cured product are further changed by hydrolysis of the insulating cured product with heat and moisture. . Since the hardness of the insulating cured product is adjusted so as to effectively protect the electric circuit from impact, if the hardness changes, the electric circuit cannot be effectively protected from impact. Furthermore, although the electric circuit is confined in the insulating hardened material, the metal such as copper constituting the circuit may rust while being used under high temperature and high humidity. Accordingly, the water-based polyurethane resin composition has excellent heat resistance (physical properties such as hardness hardly change even when exposed to high temperatures) and moisture and heat resistance (physical properties such as hardness change even when exposed to high temperatures and high humidity). It is required to provide an insulating hardened product that is difficult), and at the same time, it is required to be excellent in rust prevention (preventing the occurrence of metal rust). It is desired that the composition has such properties not only in the field of printed circuit boards but also in various fields where insulating polyurethane resins are used.

  In view of the above-mentioned demands, an object of the present invention is to provide an aqueous polyurethane resin composition that provides an insulating cured product that is easy to handle, excellent in rust prevention, and excellent in heat resistance and moist heat resistance.

  As a result of intensive studies in view of the above problems, the present inventors have found that, in an aqueous polyurethane resin composition, the oxygen content of a polyol for producing a one-component insulating polyurethane resin is 20% by weight or less, and the iodine value is 155 or less. If the triazole compound is used as a rust inhibitor added to the one-component insulating polyurethane resin, an insulating cured product excellent in heat resistance and heat and moisture resistance can be obtained. The present invention was completed by finding out that it has excellent rust resistance without impairing excellent heat resistance and moist heat resistance.

  That is, the aqueous polyurethane resin composition of the present invention further comprises a chain extender added to an insulating urethane prepolymer obtained by reacting a polyol having an oxygen content of 20% by weight or less and an iodine value of 155 or less with a polyisocyanate. One-component insulating polyurethane resin obtained by the reaction (however, the one-component insulating polyurethane resin has an isocyanate group of polyisocyanate of 1.4 to 1.4 with respect to the total active hydrogen of the polyol and the chain extender. It is characterized in that it contains an aqueous dispersion in which water is dispersed in water and a triazole compound.

  An aqueous dispersion in which the one-component insulating polyurethane resin contained in the aqueous polyurethane resin composition of the present invention is dispersed in water is a polyol and polyisocyanate having an oxygen content of 20% by weight or less and an iodine value of 155 or less. Therefore, it is possible to provide an insulating cured product having excellent heat resistance and heat-and-moisture resistance. Moreover, since the water-based polyurethane resin composition of this invention contains a triazole compound, it becomes the thing excellent also in rust prevention property, without impairing the heat resistance and wet heat resistance of the insulating hardened | cured material obtained. Furthermore, since the water-based polyurethane resin composition of the present invention is water-based, it contains an organic solvent that is harmful to the human body, easily contaminates the work environment, and has a risk of fire and explosion. Because it is not easy to handle.

According to the present invention, the triazole compound is preferably contained in an amount of 0.005 to 2% by weight based on the one-pack type insulating polyurethane resin.
When the content of the triazole compound is within this range, an aqueous polyurethane resin composition having particularly excellent rust prevention properties is obtained.

  The present invention also provides the water-based polyurethane resin composition used for insulating electrical or electronic components, particularly printed circuit boards and temperature sensors, and as an undercoat for film capacitors.

  The water-based polyurethane resin composition of the present invention provides an insulating cured product excellent in heat resistance and heat-and-moisture resistance, and is easy to handle and excellent in rust prevention.

The polyol for producing the one-component insulating polyurethane resin used in the present invention has an oxygen content of 20% by weight or less and an iodine value of 155 or less. If the oxygen content of the polyol exceeds 20% by weight, the resulting insulating cured product is inferior in heat-and-moisture resistance, and the hardness is greatly reduced in a high-temperature and high-humidity state. On the other hand, when the iodine value exceeds 155, the heat resistance of the insulating cured product is inferior and becomes hard and brittle at high temperatures.
The oxygen content of the polyol is preferably 1 to 15% by weight. When the oxygen content is within this range, the heat-and-moisture resistance of the insulating cured product is particularly improved.
The iodine value is preferably 1 to 120. When the iodine value is within this range, the heat resistance of the insulating cured product is particularly improved.
Where the oxygen content (% by weight) is

Calculated by
Further, iodine value is measured in accordance with JIS K 3331 ^-1995.

The one-component insulating polyurethane resin used in the present invention is produced from a polyol and a polyisocyanate. In the present invention, the insulating polyurethane resin is one that can obtain a cured product having a volume resistivity value (Ω · cm) of 10 ¹⁰ Ω · cm or more measured at 25 ± 5 ° C. and 65 ± 5% RH. To tell.
Furthermore, the dielectric constant is preferably 6 or less (1 MHz) and the dielectric breakdown voltage is preferably 15 KV / mm or more.
The insulating polyurethane resin has a volume resistivity value of 10 ¹⁰ Ω · cm or more, preferably ¹⁰ or more, preferably by adjusting the oxygen content of the polyol, the concentration of eluted ions, or the number of types of eluted ions. Can be obtained by adjusting to 10 ¹¹ Ω · cm or more. In particular, when the volume resistivity value is 10 ¹¹ Ω · cm or more, the insulation of the cured product is satisfactorily maintained, and can be suitably used as, for example, an insulating material for film capacitors, a sealing agent for electronic components, and the like.
The volume resistivity value is measured according to JIS C 2105. Specifically, using SE-10E manufactured by Toa Denpa Kogyo Co., Ltd., a measurement voltage of 500 V was applied to the sample (thickness: 3 mm) at 25 ± 5 ° C. and 65 ± 5% RH, and the numerical value after 60 seconds was obtained. taking measurement.

  In the present invention, as the one-component insulating polyurethane resin, as long as the obtained cured product exhibits insulating properties, as the polyol, a polyester resin using a polyester polyol, a polyether resin using a polyether polyol, and other Either a resin using a polyol or a resin using a mixture of these can be used.

Polyester polyol is a reaction product of a fatty acid and a polyol, and examples of the fatty acid include ricinoleic acid, oxycaproic acid, oxycapric acid, oxyundecanoic acid, oxylinoleic acid, oxystearic acid, and oxyhexanedecenoic acid hydroxy. Examples include long-chain fatty acids.
Examples of polyols that react with fatty acids include glycols such as ethylene glycol, propylene glycol, butylene glycol, hexamethylene glycol and diethylene glycol, trifunctional polyols such as glycerin, trimethylolpropane and triethanolamine, and tetrafunctionals such as diglycerin and pentaerythritol. Polyols, hexafunctional polyols such as sorbitol, octafunctional polyols such as sugar, addition polymerization products of alkylene oxides corresponding to these polyols with aliphatic, alicyclic and aromatic amines, and the alkylene oxides and polyamide polyamines. Examples include addition polymerization products.

  Of these, glyceride ricinoleate, polyester polyol of ricinoleic acid and 1,1,1-trimethylolpropane, and the like are preferable.

  Examples of the polyether polyol include ethylene glycol, diethylene glycol, propylene glycol, dipropylene glycol, 1,3-butanediol, 1,4-butanediol, 4,4′-dihydroxyphenylpropane, 4,4′-dihydroxyphenylmethane, etc. Dihydric alcohol or glycerin, 1,1,1-trimethylolpropane, 1,2,5-hexanetriol, trihydric or higher polyhydric alcohol such as pentaerythritol, ethylene oxide, propylene oxide, butylene oxide, α- Examples thereof include addition polymerization products with alkylene oxides such as olefin oxides.

  Examples of other polyols include carbon-carbon polyols such as acrylic polyol, polybutadiene polyol, polyisoprene polyol, hydrogenated polybutadiene polyol, AN (acrylonitrile) and SM (styrene monomer). Examples include graft-polymerized polyol, polycarbonate polyol, and PTMG (polytetramethylene glycol).

As the polyisocyanate, aromatic polyisocyanate, aliphatic polyisocyanate, alicyclic polyisocyanate and the like can be used.
Examples of the aromatic polyisocyanate include diphenylmethane diisocyanate (MDI), polymethylene polyphenylene polyisocyanate (crude MDI), tolylene diisocyanate (TDI), polytolylene polyisocyanate (crude TDI), xylene diisocyanate (XDI), and naphthalene diisocyanate. (NDI) and the like. Examples of the aliphatic polyisocyanate include hexamethylene diisocyanate (HDI). Examples of the alicyclic polyisocyanate include isophorone diisocyanate (IPDI). In addition, polyisocyanate obtained by modifying the above polyisocyanate with carbodiimide (carbodiimide-modified polyisocyanate), isocyanurate-modified polyisocyanate, urethane prepolymer (for example, a reaction product of polyol and excess polyisocyanate, and isocyanate group A material having a terminal) can also be used. These may be used alone or as a mixture.
Among these, diphenylmethane diisocyanate, polymethylene polyphenylene polyisocyanate, and carbodiimide-modified polyisocyanate are preferable.

  As a method for producing the aqueous polyurethane resin composition of the present invention, an insulating urethane prepolymer obtained from a polyol and a polyisocyanate is dispersed in water, and a chain extender is added to the obtained aqueous dispersion to obtain an aqueous polyurethane. A method for obtaining a resin composition (hereinafter referred to as method (a)), an organic solvent solution containing a one-component insulating polyurethane resin by adding a chain extender to an organic solvent solution of an insulating urethane prepolymer, and the organic solvent solution There is a method in which water is added to and dispersed in water, and an organic solvent is separated from the obtained aqueous composition (hereinafter referred to as method (b)).

Specific examples of the method (a) include the following methods.
(1) Insulating property containing a salt-forming group from a polyol, a polyisocyanate, an NCO group-reactive active hydrogen, and a compound containing a group (salt-forming group) that reacts with a salt-forming agent described below to form a salt. A urethane prepolymer is obtained, the insulating salt-forming group-containing urethane prepolymer is dispersed in water using a salt-forming agent that reacts with the salt-forming group to form a salt, and the resulting aqueous composition is chain-extended. An aqueous agent is added to react with the insulating urethane prepolymer to obtain an aqueous polyurethane resin composition containing a one-component insulating polyurethane resin.
As a compound containing a salt-forming group, (i) a compound having a salt-forming carboxylic acid or sulfonic acid group such as glycolic acid, aminocarboxylic acid, hydroxy acid, hydroxylsulfonic acid, etc. (ii) amino alcohols and amines A compound having a quaternary or tertiary group capable of being neutralized by an acid such as (iii) a halogen atom which causes a quaternization reaction such as 2-chloroethanol or 2-bromomethanol or the like Examples include compounds containing strong acid esters.
Examples of the salt-forming agent that reacts with the salt-forming group to form a salt include, for example, metal hydroxides such as sodium hydroxide and calcium hydroxide, ammonia, Examples of the salt-forming agent corresponding to the secondary amine compound and compound (ii) include, for example, inorganic and organic acids such as hydrochloric acid, nitric acid, acetic acid and methyl chloride, and compounds corresponding to the compound (iii) such as compounds having a reactive halogen atom. Examples of the forming agent include tertiary amines, sulfides, phosphine and the like.

(2) An insulating urethane prepolymer containing a hydrophilic group is obtained from polyol, polyisocyanate, monoalcohol such as methanol or ethanol or ethylene oxide of polyhydric alcohol, an adduct of the ethylene oxide and propylene oxide, and the like. An aqueous polyurethane resin composition containing a one-component insulating polyurethane resin by dispersing an insulating urethane prepolymer in water and adding a chain extender to the obtained aqueous composition to react with the insulating urethane prepolymer. obtain.

(3) An insulating urethane prepolymer is obtained from a polyol and a polyisocyanate, and the insulating urethane prepolymer is forcibly dispersed in water using an anionic, nonionic, cationic or amphoteric surfactant, A chain extender is added to the obtained aqueous dispersion and reacted with the insulating urethane prepolymer to obtain an aqueous polyurethane resin composition containing a one-component insulating polyurethane resin.
Examples of surfactants include nonionic surfactants such as polyoxyethylene polyoxypropylene glycol, polyoxyethylene alkylphenyl ether, polyoxyethylene fatty acid ester, sorbitan fatty acid ester, sodium alkylbenzene sulfonate, polyoxyethylene alkyl ether sulfate Anionic surfactants such as ammonium or sodium, higher alcohol sulfate sodium salt and the like.

(4) The salt-forming group-containing insulating urethane prepolymer obtained in step (1) is submerged in water using the salt-forming agent used in step (1) and the surfactant used in step (3). A chain extender is added to the aqueous composition obtained by dispersion and reacted with the insulating urethane prepolymer to obtain an aqueous polyurethane resin composition containing a one-component insulating polyurethane resin.

As chain extenders, dimethylolpropionic acid, trimethylolmelamine and derivatives thereof, dimethylolurea and derivatives thereof, dimethylolethylamine, diethanolmethylamine, dipropanolethylamine, dibutanolmethylamine, ethylenediamine, propylenediamine, diethylenetriamine, hexylene Examples thereof include polyamine compounds such as diamine, triethylenetetramine, tetraethylenepentamine, isophoronediamine, xylylenediamine, diphenylmethanediamine, hydrogenated diphenylmethanediamine, and hydrazine, polyamide polyamine, and polyethylene polyimine.

  The blending amount of the polyisocyanate, polyol, and chain extender is appropriately determined according to the physical properties such as hardness of the target insulating cured product. Usually, the polyisocyanate is added to the total active hydrogen of the polyol and chain extender. The isocyanate group is 1.4 to 2.2 times equivalent, preferably 1.6 to 2.0 times equivalent.

  The content of the one-component insulating polyurethane resin in the aqueous polyurethane resin composition of the present invention is not particularly limited, but is usually preferably 5 to 65% by weight, more preferably 20 to 55% by weight. When the content of the insulating polyurethane resin is 5 to 65% by weight, the one-component insulating polyurethane resin is solubilized or stably dispersed in water.

Specific examples of the triazole compound contained in the aqueous polyurethane resin composition of the present invention include 1,2,4-triazole, 3-amino-1,2,4-triazole, 3-mercapto-1,2,4- Examples include triazole, 5-amino-3-mercapto-1,2,4-triazole, 1,2,3-triazole, 1H-benzotriazole and the like.
The content of the triazole compound in the aqueous polyurethane resin composition is not particularly limited, but is preferably 0.005 to 2% by weight, more preferably 0.01 to 1% by weight, based on the one-pack type insulating polyurethane resin.

  In the water-based polyurethane resin composition of the present invention, the filler, flame retardant, antifoaming agent, antibacterial agent, stabilizer, plasticizer, thickener, antifungal agent, etc. An additive such as an aqueous dispersion resin can be included.

The water-based polyurethane resin composition of the present invention is an electronic used in switch parts and electric tools for electric washing machines, toilet seats, water heaters, water purifiers, baths, dishwashers, etc. Sealant for sealing the circuit to protect it from moisture and moisture, sealing agent and coating agent for electric and electronic devices, and capacitors, converters, transformers, electric wires, coils, electrical components (electronic components for automobiles) It is suitably used as an insulating material.
In particular, when used as an insulating material for printed circuit boards and temperature sensors, and when used as an undercoat for film capacitors, it is excellent in rust prevention, and the obtained insulating cured product is excellent in heat resistance and moisture and heat resistance. Even if the printed circuit board or temperature sensor electrical circuit or film capacitor becomes hot, or if the board, temperature sensor or film capacitor is used for a long time under hot and humid conditions such as a water product, the print Insulating hardened materials that seal circuit boards and temperature sensors can maintain appropriate electrical properties such as hardness and insulation, and there is almost no rust on metals such as electrical circuits. .

  Hereinafter, the present invention will be described in more detail based on examples. However, the present invention is not limited to these examples.

Example 1
As a polyol, 1,2-polybutadiene polyol (polyol A, hydroxyl value: 45 mgKOH / g) and polyester polyol (polyol B, hydroxyl value: 37 mgKOH / g) obtained by reacting ricinoleic acid and trimethylolpropane. A mixture (polyol A: polyol B = 80: 20 (weight ratio)) was reacted with naphthylene diisocyanate as polyisocyanate at 1: 2 (polyol: polyisocyanate equivalent ratio) at 90 ° C. for 1 hour, An insulating urethane prepolymer containing an NCO group at the end was obtained. This was dissolved in a mixed solvent of methyl ethyl ketone (MEK) and toluene (1: 1 weight ratio) to obtain a solution containing 50% by weight of an insulating urethane prepolymer. 1 equivalent of 2 equivalents of the insulating urethane prepolymer containing the terminal NCO group from which dimethylol urea was obtained as a chain extender was added to the obtained insulating urethane prepolymer solution, and the mixture was reacted at 60 ° C. for 1 hour. To obtain a solution containing a one-component insulating polyurethane resin. Ion exchange water was added in an amount of 1 time to the obtained insulating polyurethane resin-containing solution, and the solution was dispersed in water. Next, the MEK / toluene of the aqueous dispersion was removed at 80 ° C. and 3 Torr for 2 hours with a vacuum solvent remover with a cooling separator, and then 1,2,3-benzotriazole was applied to the one-pack type insulating polyurethane resin. An aqueous polyurethane resin composition containing 0.001% by weight and 53% by weight of a one-component insulating polyurethane resin was obtained.

A rust prevention test was performed using the obtained water-based polyurethane resin composition.
Rust prevention test The obtained water-based polyurethane resin composition was applied to a brass plate (50 mm x 50 mm, thickness: 1 mm) so as to have a thickness of 0.1 mm and cured to obtain a test piece. The obtained test piece was left in ion exchange water at 5 ° C., 25 ° C. and 60 ° C. in 100 ml for 10 days, and then the test piece was taken out of water and left at room temperature for 42 days. The ratio of the rust adhesion area to the surface area (250 mm ² ) of the test piece was calculated.
(Evaluation)
◎: Less than 10% ○: 10% or more and less than 20% Δ: 20% or more and less than 50% ×: 50% or more

The obtained water-based polyurethane resin composition was poured into a Teflon (registered trademark) container, left at 25 ° C. and 65% RH for 24 hours, and then dried at 80 ° C. for 24 hours to obtain a sample.
The obtained samples were subjected to the following heat treatment and wet heat treatment, and the volume resistivity, hardness and weight before and after these treatments were measured.

Heat treatment The sample obtained in a DN-62 thermostatic bath manufactured by Yamato Scientific Co., Ltd. is left at 150 ° C. for 24 hours.
Wet heat treatment Pressure cooker manufactured by Hirayama Seisakusho Co., Ltd. The sample obtained in PC-242HS-A is left under conditions of 121 ° C., 100% RH, 2 atm for 24 hours.

Measurement of volume resistivity (Ω · cm) Using SE-10E manufactured by Toa Denpa Kogyo Co., Ltd., 25 ± 5 ° C, 65 ± 5% RH, sample (50mm × 50mm, thickness: 3mm), 500V measurement voltage Is applied, and the value after 60 seconds is measured.

Measurement of Hardness Two samples (50 mm × 50 mm, thickness: 3 mm) are stacked (thickness: 6 mm), and the hardness is measured according to JIS K 6253. As a hardness meter, Polymer Instruments Co., Ltd. Asker A type is used.

  The results are shown in Table 1. About hardness and weight, it shows as a decreasing rate with respect to the value (initial value) before processing. In Table 1, VR represents the volume resistivity value, WT represents the weight reduction rate relative to the initial value, and HA represents the hardness reduction rate relative to the initial value.

Examples 2-5
A water-based polyurethane resin composition was obtained in the same manner as in Example 1 except that the amount of 1,2,3-benzotriazole was changed to the amount shown in Table 1.
Using the obtained aqueous polyurethane resin composition, a rust prevention test was conducted in the same manner as in Example 1. Moreover, according to Example 1, the sample was obtained from the obtained water-based polyurethane resin composition. In the same manner as in Example 1, the volume resistivity, hardness and weight of the obtained sample before and after heat treatment and wet heat treatment were measured. The results are shown in Table 1.

Comparative Example 1
In the same manner as in Example 1, after obtaining a one-component insulating polyurethane resin as an aqueous dispersion, no rust inhibitor was added.
Using the obtained aqueous dispersion, a rust prevention test was conducted in the same manner as in Example 1. Further, a sample was obtained from the obtained aqueous dispersion according to Example 1. In the same manner as in Example 1, the volume resistivity, hardness and weight of the obtained sample before and after heat treatment and wet heat treatment were measured. The results are shown in Table 1.

Comparative Example 2
As a rust preventive, instead of 1,2,3-benzotriazole, a 1: 1 (molar ratio) mixture of benzoic acid and triethylamine was added in an amount of 2.0% by weight based on the one-component insulating polyurethane resin. In the same manner as in Example 1, an aqueous polyurethane resin composition was obtained.
Using the obtained water-based polyurethane resin composition, a rust prevention test was conducted in the same manner as in Example 1. A sample was obtained from the obtained aqueous polyurethane resin composition according to Example 1. In the same manner as in Example 1, the volume resistivity value, hardness and weight of the obtained sample before and after heat treatment and wet heat treatment were measured, and a rust prevention test was conducted. The results are shown in Table 1.

As is apparent from Table 1, the sample obtained from the aqueous dispersion of the one-component insulating polyurethane resin of Comparative Example 1 that does not contain a rust inhibitor is inferior in rust resistance and contains a rust inhibitor other than the triazole compound. The sample obtained from the aqueous polyurethane resin composition of Comparative Example 2 was inferior in rust resistance as compared with the sample obtained in Comparative Example 1 containing no rust inhibitor.
On the other hand, the one-component insulating polyurethane resin obtained by using a polyol having an oxygen content of 20% by weight or less and an iodine value of 155 or less, and Examples 1 to 5 containing 1,2,3-benzotriazole All the samples obtained from the aqueous polyurethane resin composition were excellent in heat resistance and moist heat resistance, and all the results of the rust prevention test were excellent.

Claims (6)

  One-component insulating property obtained by further reacting an insulating urethane prepolymer obtained by reacting a polyol having an oxygen content of 20% by weight or less and an iodine value of 155 or less with a polyisocyanate. Polyurethane resin (However, the one-pack type insulating polyurethane resin is blended so that the isocyanate group of polyisocyanate is 1.4 to 2.2 times equivalent to the total of active hydrogen of polyol and chain extender. A water-based polyurethane resin composition comprising a water dispersion obtained by dispersing water) in water and a triazole compound.   The water-based polyurethane resin composition according to claim 1, wherein the triazole compound is contained in an amount of 0.005 to 2% by weight based on the one-pack type insulating polyurethane resin.   The water-based polyurethane resin composition according to claim 1 or 2, which is used for insulation of electric or electronic parts.   The water-based polyurethane resin composition according to claim 3, wherein the electrical or electronic component is a printed circuit board.   The water-based polyurethane resin composition according to claim 3, wherein the electrical or electronic component is a temperature sensor.   The water-based polyurethane resin composition according to any one of claims 1 to 3, which is used for an undercoat paint of a film capacitor.