Two-component curing polyurethane resin composition

Abstract

To combine low dielectric properties with hardness while using biomass-derived raw material.SOLUTION: A two-component curable polyurethane resin composition according to one embodiment includes a first component including a polyol and a second component including a polyisocyanate. The polyol includes a cardanol polyol and a farnesene polyol.SELECTED DRAWING: None

Description

[Technical Field]

[0001] The present invention relates to a two-component curable polyurethane resin composition and an electric / electronic part using the same. [Background technology]

[0002] Conventionally, electronic circuit boards and electronic components have been encapsulated with polyurethane resin compositions to protect them from external factors. The raw materials for such polyurethane resin compositions are generally derived from petroleum. From the viewpoint of considering environmental issues such as global warming, it is desirable to use raw materials derived from biomass, such as plants.

[0003] As an example of a method using a biomass-derived raw material, Patent Document 1 discloses the use of a polyfarnesene polyol compound together with a castor oil-based polyol compound as a polyol compound. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 6678903 Summary of the Invention [Problem to be solved by the invention]

[0005] According to the investigations of the present inventors, it has been found that when a farnesene polyol and a castor oil-based polyol are used as the polyol, although the low dielectric properties are excellent, sufficient hardness cannot be obtained.

[0006] In view of the above, an object of an embodiment of the present invention is to provide a two-component curing polyurethane resin composition that uses biomass-derived raw materials and that can achieve both low dielectric properties and hardness. [Means for solving the problem]

[0007] The present invention includes the embodiments shown below. [1] A two-component curable polyurethane resin composition comprising a first component containing a polyol and a second component containing a polyisocyanate, wherein the polyol contains a cardanol polyol and a farnesene polyol. [2] The two-component curing polyurethane resin composition according to [1], wherein the mass ratio of the cardanol polyol to the farnesene polyol is 10:90 to 80:20. [3] The two-component curing polyurethane resin composition according to [1] or [2], wherein the cardanol polyol is a novolac cardanol polyol. [4] The two-component curable polyurethane resin composition according to any one of [1] to [3], wherein the farnesene polyol is a polyfarnesene diol. [5] The two-component curable polyurethane resin composition according to any one of [1] to [4], wherein the polyisocyanate includes 1,5-pentamethylene diisocyanate and / or a derivative thereof. [6] The two-component curing polyurethane resin composition according to any one of [1] to [5], wherein the cured product has a biomass content of 60% or more. [7] The two-component curing polyurethane resin composition according to any one of [1] to [6], which is used for sealing electric and electronic components. [8] An electric / electronic part that is resin-sealed with the two-component curing polyurethane resin composition according to any one of the above [1] to [7]. [Effects of the Invention]

[0008] According to an embodiment of the present invention, it is possible to achieve both low dielectric properties and hardness while using raw materials derived from biomass. DETAILED DESCRIPTION OF THE INVENTION

[0009] The two-component curing polyurethane resin composition according to this embodiment is a polyurethane resin composition having a first component containing a polyol (A) and a second component containing a polyisocyanate (B), wherein the polyol (A) contains a cardanol polyol (A1) and a farnesene polyol (A2).

[0010] <First component> [Cardanol polyol (A1)] Cardanol polyol (A1) is used as the polyol (A) contained in the first component. Cardanol polyol (A1) is a cardanol-derived polyol synthesized from cardanol. Cardanol is the main component of cashew nut shell liquid (hereinafter referred to as CNSL), a compound in which a hydroxyl group and a linear hydrocarbon group with 15 carbon atoms are bonded to a benzene ring. CNSL is an oily component contained in cashew nut shells. Natural CNSL is primarily composed of anacardic acid, but heat treatment after oil extraction decarboxylates the anacardic acid to form cardanol.

[0011] As the cardanol polyol (A1), it is preferable to use a novolac cardanol polyol. A novolac cardanol polyol is a polyol obtained by condensing cardanol with an aldehyde compound such as formaldehyde, and then adding an epoxy compound such as ethylene oxide to the resulting condensate. As the novolac cardanol polyol, one represented by the following formula (1) can be used.

[0012] [ka]

[0013] In formula (1), R 1 represents a linear hydrocarbon group having 15 carbon atoms, which may be a saturated hydrocarbon group or an unsaturated hydrocarbon group. 1 As -(CH2) 14CH3, -(CH2)6CH=CH(CH2)6CH3, -(CH2)6CH=CHCH2CH=CH(CH2)3CH3, -(CH2)6CH=CHCH2CH=CH(CH2)2CH=CH2. Multiple R contained in one molecule 1 may be the same or different from each other.

[0014] In formula (1), R 2 represents a hydrogen atom or an alkyl group having 1 to 8 carbon atoms, preferably a hydrogen atom or an alkyl group having 1 to 2 carbon atoms, and more preferably a hydrogen atom. 2 When they are included, they may be the same or different from each other.

[0015] In formula (1), R 3 R is a hydrogen atom, a halogen atom, or a hydrocarbon group which may have a substituent. Examples of halogen atoms include a fluorine atom, a chlorine atom, and a bromine atom. Examples of hydrocarbon groups include an alkyl group, an alkenyl group, a cycloalkyl group, a cycloalkenyl group, an aryl group, and an aralkyl group. The hydrocarbon group preferably has 1 to 8 carbon atoms. Examples of the substituent include a halogen atom, a hydroxy group, and an alkoxy group. 3 is preferably a hydrogen atom or a methyl group. 3 may be the same or different from each other.

[0016] In formula (1), n ​​represents a number of 0 or more. n is preferably 1 or more, and more preferably 1.5 or more. The upper limit of n is not particularly limited, and may be, for example, 50 or less, 20 or less, or 10 or less.

[0017] The hydroxyl value of the cardanol polyol (A1) is not particularly limited, but is preferably 80 to 250 mgKOH / g, more preferably 100 to 220 mgKOH / g, and may be 130 to 200 mgKOH / g. In this specification, the hydroxyl value (OHV) is measured in accordance with Method A of JIS K1557-1:2007.

[0018] The average number of functional groups (the number of hydroxy groups contained in one molecule) of the cardanol polyol (A1) is 2.0 or more, preferably 2.2 to 8.0, more preferably 2.5 to 5.0, and may be 3.0 to 4.5.

[0019] In this specification, the average functionality is a value calculated from the number average molecular weight (Mn) measured by the GPC method (gel permeation chromatography) in accordance with JIS K7252-1:2016 and the hydroxyl value (mgKOH / g) using the following formula: Average functionality = {(hydroxyl value) × (Mn)} / (56.11 × 1000) Here, Mn is calculated from the elution time of the sample using a calibration curve prepared from the molecular weight and elution time of standard polystyrene in the GPC measurement. The measurement conditions are, for example, a TSKgel Hx1 (Tosoh Corporation) column, THF (tetrahydrofuran) as the mobile phase, a mobile phase flow rate of 1.0 mL / min, a column temperature of 40°C, a sample injection volume of 50 μL, and a sample concentration of 0.2 mass%.

[0020] [Farnesene polyol (A2)] The polyol (A) contained in the first component uses the cardanol polyol (A1) and a farnesene polyol (A2). The farnesene polyol (A2) is a farnesene-derived polyol synthesized from farnesene. Farnesene is a compound classified as a sesquiterpene, and is a raw material derived from biomass obtained from plants. The farnesene may be α-farnesene, β-farnesene, or a combination of both.

[0021] As the farnesene polyol (A2), it is preferable to use a polyfarnesene diol. A polyfarnesene diol is a polymer obtained by polymerizing a farnesene-containing monomer, both ends of which are functionalized with hydroxy groups, and may be hydrogenated. The polymer may be a farnesene homopolymer or a copolymer of farnesene and another monomer. Examples of the other monomer include diene monomers other than farnesene and vinyl monomers. The content of the farnesene-derived structural unit in the polymer is not particularly limited and may be, for example, 10 to 100% by mass, 30 to 100% by mass, 50 to 100% by mass, or 70 to 100% by mass. Preferably, the content of the farnesene-derived structural unit is 100% by mass, i.e., a diol having hydroxy groups at both ends of a farnesene homopolymer.

[0022] In one embodiment, the polyfarnesene diol preferably used is a polymer obtained by anionic polymerization of β-farnesene, both ends of which are functionalized with hydroxy groups, or a hydrogenated product thereof. In a preferred embodiment, a non-hydrogenated polyfarnesene diol made of a homopolymer of β-farnesene may be one represented by the following formula (2):

[0023] [ka]

[0024] In formula (2), R 4 [X] p and OH, and examples thereof include an alkanediyl group having 1 to 8 carbon atoms (preferably 1 to 3 carbon atoms).

[0025] In formula (2), [X] is a structural unit derived from β-farnesene, and specific examples thereof include a 1,4-trans structural unit represented by the following formula (3), a 1,4-cis structural unit represented by formula (4), a 3,4-addition structural unit represented by formula (5), and a 1,2-addition structural unit represented by formula (6). Any one of these may be used alone, or two or more may be used in combination. [ka]

[0026] In one embodiment, [X] p may be composed of 1,4-addition structural units represented by formula (3) or (4) and 3,4-addition structural units represented by formula (5). For example, the microstructure of the polyfarnesene diol may be composed of 40 to 80% by mass (more preferably 50 to 70% by mass) of 1,4-addition structural units and 20 to 60% by mass (more preferably 30 to 50% by mass) of 3,4-addition structural units. Here, the content of these structural units is 1 It can be determined by HNMR.

[0027] The hydroxyl value of the farnesene polyol (A2) is not particularly limited, but is preferably from 10 to 100 mgKOH / g, more preferably from 20 to 70 mgKOH / g, and may be from 30 to 50 mgKOH / g.

[0028] [Polyol (A)] The polyol (A) may be composed only of the cardanol polyol (A1) and the farnesene polyol (A2), or may further contain another polyol (A3) in addition to these. Preferably, from the viewpoint of increasing the biomass content, the polyol (A) is composed only of the cardanol polyol (A1) and the farnesene polyol (A2).

[0029] The other polyol (A3) is not particularly limited, and may be a compound having multiple hydroxyl groups in the molecule, such as various polyols other than the cardanol polyol (A1) and the farnesene polyol (A2). Specific examples include polybutadiene polyols, castor oil-based polyols, polyether polyols, polyester polyols, polycarbonate polyols, dimer acid polyols, polycaprolactone polyols, acrylic polyols, polyisoprene polyols, and hydrogenated polyisoprene polyols. The other polyol (A3) may also be a low-molecular-weight polyol commonly used as a crosslinking agent, such as a polyhydric alcohol having a molecular weight of 300 or less. Specific examples include aromatic alcohols such as N,N-bis(2-hydroxypropyl)aniline, hydroquinone-bis(β-hydroxyethyl)ether, and resorcinol-bis(β-hydroxyethyl)ether, and aliphatic alcohols such as ethylene glycol, 1,4-butanediol, octanediol, trimethylolpropane, and triisopropanolamine.

[0030] In one embodiment, a polybutadiene polyol may be used as the other polyol (A3). The polybutadiene polyol has a polybutadiene structure and at least two hydroxy groups in the molecule. The hydroxyl value of the polybutadiene polyol is not particularly limited and may be, for example, 10 to 200 mg KOH / g, 15 to 150 mg KOH / g, or 20 to 120 mg KOH / g.

[0031] The content of the cardanol polyol (A1) in 100% by mass of the polyol (A) is, for example, preferably 10% by mass or more, more preferably 20% by mass or more, even more preferably 30% by mass or more, and may even be 40% by mass or more. By increasing the content of the cardanol polyol (A1), the hardness of the polyurethane resin after curing can be increased. The content of the cardanol polyol (A1) is, for example, preferably 80% by mass or less, more preferably 70% by mass or less, and even more preferably 60% by mass or less.

[0032] The content of the farnesene polyol (A2) in 100% by mass of the polyol (A) is, for example, preferably 20% by mass or more, more preferably 30% by mass or more, and even more preferably 40% by mass or more. By increasing the content of the farnesene polyol (A2), low dielectric properties can be improved. The content of the farnesene polyol (A2) is, for example, preferably 90% by mass or less, more preferably 80% by mass or less, even more preferably 70% by mass or less, and may be 60% by mass or less.

[0033] The mass ratio (A1):(A2) of the cardanol polyol (A1) to the farnesene polyol (A2) is preferably 10:90 to 80:20. By setting the mass ratio within this range, it becomes easier to achieve both low dielectric properties and hardness. The mass ratio (A1):(A2) is more preferably 20:80 to 70:30, even more preferably 30:70 to 60:40, and may be 40:60 to 60:40.

[0034] When the polyol (A) contains another polyol (A3) such as a polybutadiene polyol, the content of the other polyol (A3) in 100% by mass of the polyol (A) may be, for example, 5 to 50% by mass or 10 to 40% by mass.

[0035] [Other ingredients] In addition to the components described above, various additives such as catalysts, plasticizers, antioxidants, foam stabilizers, diluents, flame retardants, ultraviolet absorbers, colorants, and fillers may be added to the first component as needed, provided that the object of the present embodiment is not impaired.

[0036] As the catalyst, for example, metal catalysts such as organotin catalysts, organolead catalysts, organobismuth catalysts, and various urethane polymerization catalysts such as amine catalysts can be used.

[0037] Examples of plasticizers include phthalic acid diesters such as dioctyl phthalate, diisononyl phthalate, and diundecyl phthalate, adipic acid diesters such as dioctyl adipate and diisononyl adipate, trimellitic acid esters such as trioctyl trimellitate and triisononyl trimellitate, pyromellitic acid esters such as tetraoctyl pyromellitate and tetraisononyl pyromellitate, and phosphate triesters such as tricresyl phosphate, trixylenyl phosphate, and cresyl diphenyl phosphate, and the like. These can be used alone or in combination of two or more. The content of the plasticizer is not particularly limited and may be, for example, 0.5 to 10% by mass relative to 100 parts by mass of the polyol (A).

[0038] <Second component> [Polyisocyanate (B)] The polyisocyanate (B) contained in the second component is not particularly limited, and various polyisocyanate compounds having two or more isocyanate groups in one molecule can be used. Examples of the polyisocyanate (B) include aliphatic polyisocyanates, alicyclic polyisocyanates, and aromatic polyisocyanates, and any one of these may be used alone or in combination of two or more.

[0039] Examples of aliphatic polyisocyanates include tetramethylene diisocyanate, pentamethylene diisocyanate, hexamethylene diisocyanate (HDI), dodecamethylene diisocyanate, 2,2,4-trimethylhexamethylene diisocyanate, 2,4,4-trimethylhexamethylene diisocyanate, lysine diisocyanate, 2-methylpentane-1,5-diisocyanate, 3-methylpentane-1,5-diisocyanate, and derivatives thereof.

[0040] Examples of alicyclic polyisocyanates include isophorone diisocyanate (IPDI), hydrogenated xylylene diisocyanate, 4,4'-dicyclohexylmethane diisocyanate, 1,4-cyclohexane diisocyanate, methylcyclohexylene diisocyanate, 1,3-bis(isocyanatomethyl)cyclohexane, and derivatives thereof.

[0041] Examples of aromatic polyisocyanates include tolylene diisocyanate (TDI, for example, 2,4-TDI and 2,6-TDI), diphenylmethane diisocyanate (MDI, for example, monomeric MDI and polymeric MDI), 4,4'-dibenzyl diisocyanate, 1,5-naphthylene diisocyanate, xylylene diisocyanate (XDI), 1,3-phenylene diisocyanate, 1,4-phenylene diisocyanate, and derivatives thereof.

[0042] Examples of the derivatives include isocyanurate-modified products, allophanate-modified products, biuret-modified products, adduct-modified products, and carbodiimide-modified products.

[0043] In one embodiment, it is preferable to use a biomass-derived polyisocyanate as the polyisocyanate (B). Specifically, it is preferable that the polyisocyanate (B) contains 1,5-pentamethylene diisocyanate and / or a derivative thereof. 1,5-pentamethylene diisocyanate and its derivatives can be synthesized from plant-derived biomass raw materials and can increase the biomass content of the cured product. It is also believed that they can enhance the effect of achieving both low dielectric properties and hardness. Examples of derivatives of 1,5-pentamethylene diisocyanate include isocyanurate-modified products, allophanate-modified products, biuret-modified products, adduct-modified products, and carbodiimide-modified products, with the isocyanurate-modified product being preferred.

[0044] In one embodiment, when 1,5-pentamethylene diisocyanate and / or a derivative thereof is used as the polyisocyanate (B), the amount thereof is not particularly limited, but is preferably 30% by mass or more, more preferably 50% by mass or more, and even more preferably 80% by mass or more, relative to 100% by mass of the polyisocyanate (B), and may be 100% by mass.

[0045] The polyisocyanate (B) may be composed of only difunctional compounds, or may contain trifunctional or higher functional compounds, but preferably contains trifunctional or higher functional polyisocyanates.

[0046] The isocyanate value of the polyisocyanate (B) may be, for example, 100 to 700 mgKOH / g, 200 to 500 mgKOH / g, or 300 to 450 mgKOH / g. In this specification, the isocyanate value (NCOV) is calculated by the formula: Isocyanate value = {(Isocyanate content) × 56110} / (42.02 × 100) using the isocyanate content measured in accordance with Method A of JIS K1603-1:2007.

[0047] [Other ingredients] The second component may be composed of only the polyisocyanate (B), or, in addition to the polyisocyanate (B), various additives such as catalysts, antioxidants, foam stabilizers, diluents, flame retardants, ultraviolet absorbers, colorants, fillers, and plasticizers may be added as needed within the scope that does not impair the object of this embodiment.

[0048] <Two-component curing polyurethane resin composition> The two-component curing polyurethane resin composition according to this embodiment is typically composed of a first component as a first liquid and a second component as a second component, but may also include a third component as the third liquid, which contains the above-mentioned other components as optional components in addition to the first and second components.

[0049] The two-component curable polyurethane resin composition can be produced by separately preparing the first component and the second component; that is, the first component and the second component may be filled in separate containers. The first component and the second component filled in separate containers may be mixed at the time of use, causing the polyol (A) and the polyisocyanate (B) to react to form a polyurethane resin, which may then be cured. At this time, the polyurethane resin may be cured by heating. The two-component curable polyurethane resin composition according to the embodiment may be obtained by mixing the first component and the second component, and may be in a liquid state before curing, or may be cured.

[0050] In the two-component curing polyurethane resin composition, the content of the polyisocyanate (B) is not particularly limited, and may be, for example, 5 to 70 parts by mass or 10 to 50 parts by mass per 100 parts by mass of the polyol (A).

[0051] In the two-component curing polyurethane resin composition, the NCO / OH (index) is not particularly limited and may be, for example, 0.60 to 1.50, 0.80 to 1.40, 1.00 to 1.30, or 1.05 to 1.20. Here, NCO / OH is the molar ratio of isocyanate groups contained in polyisocyanate (B) to hydroxy groups contained in polyol (A). NCO / OH is calculated using the hydroxyl value of polyol (A) and the isocyanate value of polyisocyanate (B).

[0052] The two-component curing polyurethane resin composition preferably has a biomass degree of 60% or more in the cured product. The biomass degree is more preferably 70% or more, and even more preferably 80% or more. Since a higher biomass degree is preferable, there is no particular upper limit, but it may be, for example, 95% or less.

[0053] In this specification, the biomass content of the cured product is a value obtained by adding the biocontent (%) of each biomass-derived raw material constituting the two-component curing polyurethane resin composition according to their mass ratio (i.e., the mass ratio of the biomass-derived raw material to the total mass of the cured product). Here, the biocontent (%) of each biomass-derived raw material is measured in accordance with ASTM D6866-21.

[0054] For example, let C1 be the biocontent (%) of the cardanol polyol (A1), and D1 be the mass ratio (mass%) of the cardanol polyol (A1) to the total mass of the cured product. Let C2 be the biocontent (%) of the farnesene polyol (A2), and D2 be the mass ratio (mass%) of the farnesene polyol (A2) to the total mass of the cured product. Let C3 be the biocontent (%) of the biomass-derived polyisocyanate, and D3 be the mass ratio (mass%) of the biomass-derived polyisocyanate to the total mass of the cured product. The biomass degree of the cured product is then calculated using the following formula: Biomass ratio (%) = C1 x D1 / 100 + C2 x D2 / 100 + C3 x D3 / 100

[0055] <Uses of two-component curing polyurethane resin compositions> The use of the two-component curing polyurethane resin composition according to this embodiment is not particularly limited, but it is preferably used for sealing electrical and electronic components. Examples of electrical and electronic components include transformers such as transformer coils, choke coils, and reactor coils, device control boards, sensors, and wireless communication components. The two-component curing polyurethane resin composition has excellent low dielectric properties (i.e., a low dielectric constant) and is less susceptible to the effects of radio waves. Therefore, the two-component curing polyurethane resin composition is preferably used as a sealant that seals, i.e., coats, wireless communication components that perform wireless communication to protect them from the external environment. For example, it may be used as a sealant for sensors that transmit detected information via wireless communication.

[0056] Electrical and electronic components resin-encapsulated with the two-component curing polyurethane resin composition according to this embodiment can be used in, for example, electric washing machines, toilet seats, water heaters, water purifiers, bathtubs, dishwashers, solar panels, power tools, automobiles, motorcycles, and the like. [Example]

[0057] The two-component curing polyurethane resin composition will be described in detail below based on examples and comparative examples, but the present invention is not limited thereto.

[0058] The raw materials used in the examples and comparative examples are shown below.

[0059] [Polyol (A)] Farnesene polyol 1: Polyfarnesene diol represented by the above formula (2), "KRASOL F3000 (product name)" manufactured by Cray Valley, hydroxyl value 37 mg KOH / g, number average molecular weight (Mn) 3000, microstructure (1,4-addition structural unit 60% by mass, 3,4-addition structural unit 40% by mass), biocontent 97% Cardanol polyol 1: Novolac-type cardanol polyol represented by the above formula (1), Cardolite NX-9001LV (product name) manufactured by Cardolite Co., Ltd., hydroxyl value 175 mg KOH / g, average functionality 3.8, biocontent 91.4% Cardanol polyol 2: Novolac-type cardanol polyol represented by the above formula (1), Cardolite LITE-9001 (product name) manufactured by Cardolite Co., Ltd., hydroxyl value 160 mg KOH / g, average functionality 4.3, biocontent 88%

[0060] Polybutadiene polyol: EVONIK "Polybest HT" (product name), hydroxyl value 47 mg KOH / g, number average molecular weight (Mn) 2800 Castor oil-based polyol: "Castor Oil (product name)" manufactured by Ito Oil Mills, hydroxyl value 161 mg KOH / g, Mn 1500, 100% biocontent Polyether polyol: Polypropylene glycol, AGC Corporation "Exenol 903 (product name)", hydroxyl value 112 mg KOH / g, Mn 941 Isoprene glycol: hydroxyl value 1079 mg KOH / g, molecular weight 104 Octanediol: hydroxyl value 768mgKOH / g, molecular weight 146 Dipropylene glycol: hydroxyl value 836 mg KOH / g, molecular weight 134

[0061] [Polyisocyanate (B)] Polyisocyanate 1: Isocyanurate modified with 1,5-pentamethylene diisocyanate, Mitsui Chemicals, Inc. "Stabio D-376N (product name)", isocyanate value 321 mg KOH / g, biocontent 67% Polyisocyanate 2: Polymeric MDI, BASF INOAC Polyurethanes Ltd. "Lupranate M5S (product name)", isocyanate value 428 mg KOH / g Polyisocyanate 3: HDI isocyanurate modified product, Asahi Kasei Corporation "Duranate TLA-100 (product name)", isocyanate value 311 mg KOH / g

[0062] [Other ingredients] Tin-based catalyst: "Neostan U-810" (product name) manufactured by Nitto Kasei Co., Ltd. Plasticizer: Diundecyl phthalate, Sanso Cizer DUP (product name) manufactured by New Japan Chemical Co., Ltd.

[0063] [Examples 1 to 8 and Comparative Examples 1 to 8] Two-component curable polyurethane resin compositions for each Example and Comparative Example were prepared according to the formulations (parts by mass) shown in Tables 1 and 2 below. For preparation, a predetermined amount of the first component shown in Tables 1 and 2 was weighed out, stirred and mixed while appropriately heated to dissolve, and after mixing, the temperature was adjusted to 25°C. Subsequently, the second component, also adjusted to 25°C, was added to this mixture in the formulation ratio (parts by mass of the second component relative to 100 parts by mass of the first component) and NCO / OH (index) shown in Tables 1 and 2, stirred and mixed, and degassed.

[0064] Tables 1 and 2 show the biomass content of the cured product of each two-component curing polyurethane resin composition.

[0065] The compatibility, dielectric constant, and hardness of each two-component curing polyurethane resin composition were measured and evaluated according to the following methods.

[0066] [compatibility] The appearance of the liquid after mixing with the first component was checked, and the compatibility of the polyol was evaluated according to the following criteria. For samples D and E, in which separation occurred in the first component in this evaluation, the compatibility of the polyol was poor, and measurement and evaluation as a two-component curable polyurethane resin composition were not possible, so evaluation of the dielectric constant and hardness was not performed. A:Transparent B: Slightly cloudy C: Cloudy D: Separation occurs after 30 minutes or more E: Separation occurs in less than 30 minutes

[0067] [Dielectric constant] The dielectric constant at 1 MHz was measured in accordance with JIS C2138:2007. Specifically, the degassed two-component curing polyurethane resin composition was poured into a 3 mm thick mold and cured at 80°C for 16 hours (overnight) to produce a 3 mm thick resin sheet. The resin sheet was cut into 50 mm x 50 mm x 3 mm sheets to serve as measurement samples. Measurements were performed using an Agilent Technologies Inc. device (main body model: E4980A, name: Precision LCR Meter; electrode part model: 16451B, name: Dielectric Test Fixture), and the dielectric constant (relative permittivity) at a frequency of 1 MHz was measured.

[0068] [hardness] Measurements were made using a Type A durometer as specified in JIS K7215:1986. Specifically, the degassed two-component curing polyurethane resin composition was poured into a 200 mL cup and cured at 80°C for 16 hours (overnight) to produce a cured resin. The test specimen was 6 mm or more thick and approximately 25 mm or more wide. The test was performed by placing the test specimen on a flat, solid surface, and pressing the pressure reference surface of the durometer against the sample surface as quickly as possible without impact, while keeping it parallel to the sample surface, to ensure good contact between the pressure reference surface and the sample. The maximum indicated value on the indicator's pointer was then quickly read, and the specimen was evaluated according to the following criteria. A: Hardness 25 or more B: Hardness is 20 or more and less than 25 C: Hardness is 15 or more and less than 20 D: Hardness is 10 or more and less than 15 E: Hardness less than 10

[0069] [Table 1]

[0070] [Table 2]

[0071] The results are shown in Tables 1 and 2. Comparative Examples 1 and 2, in which only farnesene polyol was used as the polyol and no cardanol polyol was used in combination, exhibited excellent low-dielectric properties but did not achieve sufficient hardness. Comparative Example 3, in which farnesene polyol and castor oil-based polyol were used in combination, also did not achieve sufficient hardness. On the other hand, Comparative Example 4, in which farnesene polyol and polyether polyol were used in combination, achieved sufficient hardness but exhibited a significantly increased dielectric constant and poor low-dielectric properties. Comparative Examples 5, 6, and 8, in which farnesene polyol was used in combination with isoprene glycol, octanediol, or dipropylene glycol, exhibited poor compatibility with the first component. Comparative Example 7, in which only cardanol polyol was used as the polyol and no farnesene polyol was used in combination, achieved sufficient hardness but poor low-dielectric properties.

[0072] In contrast, Examples 1 to 8, which used a combination of cardanol polyol and farnesene polyol as the polyol, had a dielectric constant of 3.1 or less, exhibiting excellent low dielectric properties, and were also able to obtain sufficient hardness with hardness ratings of A to C. Furthermore, all of Examples 1 to 8 had a biomass content of 60% or more, and were able to achieve both low dielectric properties and hardness while using biomass-derived raw materials.

[0073] Comparing Example 1 with Examples 4 and 8, when 1,5-pentamethylene diisocyanate and / or its derivatives were used as the polyisocyanate, not only was the biomass content high, but the hardness was also high, and the effect of achieving both low dielectric properties and hardness was excellent.

[0074] The various numerical ranges described in this specification can be arbitrarily combined with their upper and lower limits, and all such combinations are considered to be preferred numerical ranges described in this specification. Furthermore, a numerical range described as "X to Y" means from X to Y.

[0075] Although several embodiments of the present invention have been described above, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, substitutions, and modifications can be made without departing from the spirit of the invention. These embodiments and their omissions, substitutions, modifications, etc. are included within the scope and spirit of the invention, as well as within the scope of the invention described in the claims and their equivalents.

Claims

1. A first component including a polyol and a second component including a polyisocyanate, The polyol comprises a cardanol polyol and a farnesene polyol. A two-component curing polyurethane resin composition.

2. 2. The two-component curing polyurethane resin composition according to claim 1, wherein a mass ratio of the cardanol polyol to the farnesene polyol is 10:90 to 80:

20.

3. 3. The two-component curing polyurethane resin composition according to claim 1, wherein the cardanol polyol is a novolac cardanol polyol.

4. The two-component curable polyurethane resin composition according to any one of claims 1 to 3, wherein the farnesene polyol is a polyfarnesene diol.

5. The two-component curable polyurethane resin composition according to any one of claims 1 to 4, wherein the polyisocyanate comprises 1,5-pentamethylene diisocyanate and / or a derivative thereof.

6. The two-component curing polyurethane resin composition according to any one of claims 1 to 5, wherein the cured product has a biomass content of 60% or more.

7. The two-component curing polyurethane resin composition according to any one of claims 1 to 6, which is used for sealing electric and electronic components.

8. An electric / electronic part resin-sealed with the two-component curing polyurethane resin composition according to any one of claims 1 to 7.

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