Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
  • C08G59/22—Di-epoxy compounds
  • C08G59/30—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen
  • C08G59/306—Di-epoxy compounds containing atoms other than carbon, hydrogen, oxygen and nitrogen containing silicon
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/20—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the epoxy compounds used
  • C08G59/22—Di-epoxy compounds
  • C08G59/226—Mixtures of di-epoxy compounds
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G59/00—Polycondensates containing more than one epoxy group per molecule; Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups
  • C08G59/18—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing
  • C08G59/40—Macromolecules obtained by polymerising compounds containing more than one epoxy group per molecule using curing agents or catalysts which react with the epoxy groups ; e.g. general methods of curing characterised by the curing agents used
  • C08G59/50—Amines
  • C08G59/5033—Amines aromatic
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/14—Polysiloxanes containing silicon bound to oxygen-containing groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/22—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen
  • C08G77/26—Polysiloxanes containing silicon bound to organic groups containing atoms other than carbon, hydrogen and oxygen nitrogen-containing groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08G—MACROMOLECULAR COMPOUNDS OBTAINED OTHERWISE THAN BY REACTIONS ONLY INVOLVING UNSATURATED CARBON-TO-CARBON BONDS
  • C08G77/00—Macromolecular compounds obtained by reactions forming a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon in the main chain of the macromolecule
  • C08G77/04—Polysiloxanes
  • C08G77/38—Polysiloxanes modified by chemical after-treatment
  • C08G77/382—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon
  • C08G77/388—Polysiloxanes modified by chemical after-treatment containing atoms other than carbon, hydrogen, oxygen or silicon containing nitrogen

Definitions

• the present invention relates to an epoxy resin composition.
• Epoxy resins are used in a variety of fields due to their excellent mechanical strength, electrical insulation, heat resistance, chemical resistance, water resistance, low shrinkage, and adhesive properties. In recent years, performance requirements for epoxy resins have increased, and development is underway to address the issue of epoxy resins' low toughness (Patent Documents 1 to 4).
• Epoxy-modified silicone is a polyorganosiloxane containing epoxy groups, and is used in applications such as resin modifiers, fiber treatment agents, and paint additives, taking advantage of the reactivity of the epoxy groups. It is also expected to have the effect of imparting flexibility to epoxy resins, but has the problem of poor compatibility with other polar compounds such as hardeners, leading to separation.
• Patent Document 5 describes a silicone with urethane bonds with epoxy groups introduced at both ends.
• a transparent solution is obtained when mixed with a bisphenol A type epoxy resin, and a hardened product is obtained by reaction with a hardener.
• the addition of this silicone lowers the glass transition point (Tg) of the epoxy resin itself, which causes a problem of reduced heat resistance.
• Patent Document 6 discloses an epoxy resin having a mesogenic group, and reports that it has excellent workability and excellent mechanical, thermal, and chemical properties. However, it was not clear how the physical properties would change when the epoxy resin was mixed with a general epoxy resin such as a bisphenol-type epoxy resin.
• the present invention was made in consideration of these circumstances, and aims to provide an epoxy resin composition containing polyorganosiloxane.
• the present invention provides an epoxy resin composition
• an epoxy resin composition comprising: (A) an epoxy resin containing two or more epoxy groups in one molecule; (B) a urethane bond-containing polyorganosiloxane represented by the following formula (1):
• R 1 's are each independently a group selected from an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, or a hydroxyl group
• X's are each independently a divalent alkylene group having 1 to 10 carbon atoms
• Y's are each independently a group selected from an alkylene group having 5 to 30 carbon atoms which may have an ether bond, an arylene group having 6 to 30 carbon atoms, and an aralkylene group having 7 to 30 carbon atoms
• Z's are each independently an alkylene group having 1 to 20 carbon atoms which may have an ether bond
• n is an
• Such an epoxy resin composition is an epoxy resin composition containing polyorganosiloxane that has excellent properties.
• the composition contains 1 to 20 parts by mass of the (B) component and 1 to 20 parts by mass of the (C) component per 100 parts by mass of the (A) component.
• Such an epoxy resin composition provides sufficient strength and adhesive power as a cured epoxy resin.
• the decrease in Tg is suppressed, so high heat resistance can be maintained.
• the number average molecular weight of the (B) component, calculated based on polystyrene standard is 500 to 100,000.
• the size of the structures that make up the island structure of the sea-island structure does not become too large, and microphase separation can be formed.
• the number average molecular weight within this range the size of the island structures can be controlled.
• the epoxy equivalent (g/mol) of the (B) component is 300 to 5,000 g/mol.
• the size of the structures that make up the island structure of the sea-island structure does not become too large, and microphase separation can be formed.
• the size of the island structures can be controlled.
• the (B) component contains hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of 3,000 ppm or less.
• the number average molecular weight of the (C) component, calculated based on polystyrene standard is 500 to 100,000.
• the epoxy groups at both ends will react with the curing agent, resulting in a molecular weight sufficient to produce a cured product.
• the epoxy equivalent (g/mol) of the (C) component is 300 to 5,000 g/mol.
• the (C) component contains hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of 3,000 ppm or less.
• the (A) epoxy resin is a bisphenol type epoxy resin.
• Such an epoxy resin composition can enhance the properties of the various selected bisphenol-type epoxy resins used, resulting in an epoxy resin composition that can increase both the elongation properties and tensile shear strength compared to when the bisphenol-type epoxy resin is used alone.
• the (D) epoxy resin curing agent is an amine-based curing agent.
• Such an epoxy resin composition provides good curing properties.
• the composition further contains (E) a filler.
• Such an epoxy resin composition can reinforce the mechanical strength.
• the present invention relates to an epoxy resin composition containing a polyorganosiloxane. More specifically, the present invention relates to an epoxy resin composition containing a polyorganosiloxane having epoxy groups at both ends and a urethane bond in the main chain, and a polyorganosiloxane having epoxy groups at both ends and a mesogen group in the main chain.
• the epoxy resin composition of the present invention due to its specified structure and formulation, disperses without phase separation when a cured product is produced, improves toughness without reducing the heat resistance of the cured product, and exhibits good adhesive strength when a cured product is produced between substrates, making it highly useful.
• by reducing the amount of low molecular weight cyclic siloxanes it is possible to prevent deposition on equipment and malfunction of the device due to their volatilization and diffusion during the production of the cured product.
• an epoxy resin composition containing (A) an epoxy resin, (B) a urethane bond-containing polyorganosiloxane, (C) a mesogen group-containing polyorganosiloxane, and (D) an epoxy resin curing agent, and thus completed the present invention.
• the present invention provides an epoxy resin composition, (A) an epoxy resin containing two or more epoxy groups in one molecule; (B) a urethane bond-containing polyorganosiloxane represented by the following formula (1):
• R 1 's are each independently a group selected from an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, or a hydroxyl group
• X's are each independently a divalent alkylene group having 1 to 10 carbon atoms
• Y's are each independently a group selected from an alkylene group having 5 to 30 carbon atoms which may have an ether bond, an arylene group having 6 to 30 carbon atoms, and an aralkylene group having 7 to 30 carbon atoms
• Z's are each independently an alkylene group having 1 to 20 carbon atoms which may have an ether bond
• n is an integer of 0 to 100;
• the epoxy resin composition of the present invention is an epoxy resin composition comprising (A) an epoxy resin, (B) a urethane bond-containing polyorganosiloxane, (C) a mesogen group-containing polyorganosiloxane, and (D) an epoxy resin curing agent.
• A an epoxy resin
• B a urethane bond-containing polyorganosiloxane
• C a mesogen group-containing polyorganosiloxane
• D an epoxy resin curing agent
• the epoxy resin (A) in the present invention contains two or more epoxy groups in one molecule.
• This epoxy resin can be a known epoxy resin, and is not particularly limited.
• the epoxy resin include bisphenol type epoxy resins such as bisphenol A type epoxy resin, bisphenol F type epoxy resin, and bisphenol S type epoxy resin; alicyclic epoxy resins such as dicyclopentadiene type epoxy resin and 3,4-epoxycyclohexenylmethyl-3',4'-epoxycyclohexenecarboxylate; polyfunctional phenol type epoxy resins such as resorcinol type epoxy resin; stilbene type epoxy resin, triazine skeleton-containing epoxy resin, fluorene skeleton-containing epoxy resin, triphenol alkane type epoxy resin, biphenyl type epoxy resin, xylylene type epoxy resin, biphenyl aralkyl type epoxy resin, naphthalene type epoxy resin, and diglycidyl ether compounds of polycyclic aromatics such as anthrac
• the epoxy equivalent of the epoxy resin (A) is not particularly limited, but from the viewpoint of the pot life after mixing and the strength of the cured product, it is preferably 50 to 5,000 g/eq, calculated per solid content, and more preferably 75 to 2,500 g/eq.
• the viscosity of the epoxy resin (A) is not particularly limited, but it is preferable that it is liquid at 25°C and has a viscosity of 10 to 100,000 mPa ⁇ s, preferably 20 to 50,000 mPa ⁇ s. The viscosity is measured using a B-type viscometer.
• R 1 's are each independently a group selected from an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, or a hydroxyl group;
• X's are each independently a divalent alkylene group having 1 to 10 carbon atoms;
• Y's are each independently a group selected from an alkylene group having 5 to 30 carbon atoms which may have an ether bond, an arylene group having 6 to 30 carbon atoms, and an aralkylene group having 7 to 30 carbon atoms;
• Z's are each independently an alkylene group having 1 to 20 carbon atoms which may have an ether bond;
• n is an integer of 0 to 100; and
• m is 1 to
• R 1 is, independently of one another, a group selected from an alkyl group having 1 to 12 carbon atoms, preferably 1 to 8 carbon atoms, an aryl group having 6 to 12 carbon atoms, preferably 6 to 9 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, preferably 7 to 10 carbon atoms, or a hydroxyl group.
• linear or branched alkyl groups such as methyl, ethyl, n-propyl, isopropyl, n-butyl, isobutyl, s-butyl, t-butyl, n-pentyl, n-hexyl, n-heptyl, n-octyl, 2-ethylhexyl, n-nonyl, and n-decyl; cycloalkyl groups such as cyclohexyl; aryl groups such as phenyl and naphthyl; and aralkyl groups such as benzyl. Of these, a methyl group or a phenyl group is preferred.
• X's are each independently an alkylene group having 1 to 10 carbon atoms, preferably 1 to 8 carbon atoms.
• alkylene groups having 1 to 10 carbon atoms include methylene groups, ethylene groups, propylene groups, n-hexylene groups, and n-octylene groups. Methylene groups are preferred.
• each Y is independently a group selected from an alkylene group having 5 to 30 carbon atoms, an arylene group having 6 to 30 carbon atoms, and an aralkylene group having 7 to 30 carbon atoms.
• the alkylene group having 5 to 30 carbon atoms may be linear, branched, or cyclic, and specific examples include linear or branched alkylene groups such as n-pentylene, n-hexylene, n-heptylene, n-octylene, 2-ethylhexylene, n-decylene, n-undecylene, n-dodecylene, n-tridecylene, n-tetradecylene, n-pentadecylene, n-hexadecylene, n-heptadecylene, n-octadecylene, n-nonadecylene, and n-eicosanylene.
• linear or branched alkylene groups such as n-pentylene, n-hexylene, n-heptylene, n-octylene, 2-ethylhexylene, n
• the alkylene group may have one or more ether bonds in the middle of the molecular chain. Specifically, it is a group containing an ether bond, such as an ethyleneoxy group, a propyleneoxy group, or a butyleneoxy group, and may have multiple ether bonds.
• arylene groups having 6 to 30 carbon atoms include o-phenylene groups, m-phenylene groups, p-phenylene groups, 3,5-tolylene groups, 2,4-tolylene groups, 2,6-tolylene groups, 1,2-naphthylene groups, 1,8-naphthylene groups, 2,3-naphthylene groups, 4,4'-biphenylene groups, and 4,4'-methylenebisphenyl groups.
• Examples of aralkylene groups having 7 to 30 carbon atoms include o-xylylene groups, m-xylylene groups, p-xylylene groups, and 1,3-phenylenebis(2-propyl) groups.
• Y is preferably any of the following groups:
• the dotted line indicates the bonding site with the nitrogen atom of the urethane bond in formula (1), and hydrogen atoms are conventionally omitted.
• Z's are each independently an alkylene group having 1 to 20 carbon atoms, preferably 3 to 10 carbon atoms.
• One or more ether bonds may be present in the alkylene chain having 1 to 20 carbon atoms.
• Preferred are a propylene group (-CH 2 CH 2 CH 2 -) and an ethyleneoxypropylene group (*-CH 2 CH 2 OCH 2 CH 2 CH 2 -).
• * indicates a bond with the oxygen atom of the urethane bond in formula (1).
• n is an integer from 0 to 100.
• n is an integer from 0 to 60.
• m represents the average degree of polymerization, and m is 1 to 10, preferably 1 or 2.
• the number average molecular weight of the urethane bond-containing polyorganosiloxane (B) in the present invention is preferably 500 to 100,000, more preferably 500 to 50,000, and even more preferably 500 to 20,000. Within this range, the epoxy groups at both ends react with the curing agent, resulting in a molecular weight sufficient to obtain a cured product.
• the number average molecular weight refers to the number average molecular weight converted into a polystyrene standard substance in gel permeation chromatography (GPC) measurements under the following measurement conditions.
• the epoxy equivalent (g/mol) of the urethane bond-containing polyorganosiloxane (B) in the present invention is preferably 300 to 5,000 g/mol, more preferably 400 to 2,500 g/mol. Within this range, the epoxy groups at both ends will react with the curing agent, and the amount will be sufficient to obtain a cured product with good physical properties.
• the epoxy equivalent (g/mol) can be calculated by adding hydrochloric acid to a specified mass of sample dissolved in 1,4-dioxane and back titrating with an aqueous sodium hydroxide solution.
• urethane bond-containing polyorganosiloxane represented by formula (1) it is preferable to use one that contains hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of 3,000 ppm or less, more preferably 2,000 ppm or less, and even more preferably 1,000 ppm or less.
• D3 hexamethylcyclotrisiloxane
• D4 octamethylcyclotetrasiloxane
• D5 decamethylcyclopentasiloxane
• D6 dodecamethylcyclohexasiloxane
• the amount of the low molecular weight cyclic siloxanes (D3 to D6) can be quantified by gas chromatography (GC) using a sample obtained by extracting and diluting the urethane bond-containing polyorganosiloxane (B) represented by formula (1) with an organic solvent.
• GC gas chromatography
• the mesogen group-containing polyorganosiloxane of the present invention is represented by the following formula (2).
• R1 's each independently represent a group selected from an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, or a hydroxyl group
• p represents a repeating unit of a siloxane structure and is an integer from 0 to 100
• R2 's each independently represent the following formula (3) or formula (4).
• R 1 is, independently of each other, the same as those exemplified in the formula (1).
• R 2 is, independently of each other, the following formula (3) or (4).
• R3 and R4 each independently represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms
• L is a linking group to the formula (2) and is a divalent hydrocarbon group having 1 to 12 carbon atoms
• a and b each represent the number of substituents of the phenyl group in the formula (3) and the formula (4) and are integers of 0 to 4
• G is a glycidyl ether group.
• R 3 and R 4 each independently represent a hydrogen atom or a monovalent hydrocarbon group having 1 to 10 carbon atoms.
• the monovalent hydrocarbon group having 1 to 10 carbon atoms is preferably a group selected from an alkyl group having 1 to 10 carbon atoms, an aryl group having 6 to 10 carbon atoms, or an aralkyl group having 7 to 10 carbon atoms, and specific examples thereof include the same as those exemplified in formula (1) above.
• a and b represent the number of substituents on the phenyl group in formulas (3) and (4) and are integers from 0 to 4.
• G in formulas (3) and (4) is a glycidyl group.
• L in formulas (3) and (4) is a linking group to formula (2) and is a divalent hydrocarbon group having 1 to 12 carbon atoms.
• Divalent hydrocarbon groups include alkylene groups with 1 to 12 carbon atoms, arylene groups with 6 to 12 carbon atoms, and aralkylene groups with 7 to 12 carbon atoms.
• the alkylene group having 1 to 12 carbon atoms may be linear, branched, or cyclic, and specific examples include linear or branched alkylene groups such as n-pentylene, n-hexylene, n-heptylene, n-octylene, 2-ethylhexylene, n-decylene, n-undecylene, and n-dodecylene.
• the alkylene group may have one or more ether bonds in the middle of the molecular chain. Specifically, it is a group containing an ether bond, such as an ethyleneoxy group, a propyleneoxy group, or a butyleneoxy group, and may have multiple ether bonds.
• arylene groups having 6 to 12 carbon atoms include o-phenylene groups, m-phenylene groups, p-phenylene groups, 3,5-tolylene groups, 2,4-tolylene groups, 2,6-tolylene groups, 1,2-naphthylene groups, 1,8-naphthylene groups, 2,3-naphthylene groups, and 4,4'-biphenylene groups.
• Examples of aralkylene groups having 7 to 12 carbon atoms include o-xylylene groups, m-xylylene groups, and p-xylylene groups.
• R2 in formula (2) is more preferably formula (5).
• the mesogen group-containing polyorganosiloxane (C) in the present invention preferably has a number average molecular weight of 500 to 100,000, more preferably 500 to 50,000, and even more preferably 500 to 20,000. Within this range, the epoxy groups at both ends react with the curing agent, resulting in a molecular weight sufficient to obtain a cured product.
• the number average molecular weight is the same as above.
• the mesogenic group-containing polyorganosiloxane (C) in the present invention preferably has an epoxy equivalent (g/mol) of 300 to 5,000 g/mol, more preferably 400 to 2,500 g/mol. Within this range, the epoxy groups at both ends will react with the epoxy resin curing agent (D) described below, and the amount will be sufficient to obtain a cured product with good physical properties.
• the epoxy equivalent (g/mol) can be calculated by adding hydrochloric acid to a specified mass of sample dissolved in 1,4-dioxane and back titrating with an aqueous sodium hydroxide solution.
• component (C) it is preferable to use hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of more than 0 ppm and 3,000 ppm or less, more preferably 0.1 to 2,000 ppm, and even more preferably 0.1 to 1,000 ppm.
• D3 hexamethylcyclotrisiloxane
• D4 octamethylcyclotetrasiloxane
• D5 decamethylcyclopentasiloxane
• D6 dodecamethylcyclohexasiloxane
• the amount of the low molecular weight cyclic siloxanes (D3 to D6) is a value quantified by gas chromatography (GC) using a sample in which component (C) is extracted and diluted with an organic solvent.
• GC gas chromatography
• the above-mentioned "greater than 0 ppm” is considered to be “greater than 0 ppm” if even a slight peak is detected when quantified using the above-mentioned method.
• component (A) when component (A) is taken as 100 parts by mass, component (B) is preferably 1 to 20 parts by mass, more preferably 10 to 20 parts by mass. Similarly, component (C) is preferably 1 to 20 parts by mass, more preferably 1 to 10 parts by mass. If the parts by mass of components (B) and (C) are within this range, the strength and adhesive power of the cured epoxy resin can be sufficiently obtained. In addition, since a decrease in Tg is suppressed, high heat resistance can be maintained.
• the epoxy resin curing agent (D) in the present invention may be any known curing agent capable of reacting with and curing an epoxy resin. This curing agent is added to react reactive functional groups (amino groups, phenolic hydroxyl groups, acid anhydride groups, mercapto groups, etc.) in the curing agent molecule with epoxy groups in components (A), (B) and (C) to form a cured product with a three-dimensional crosslinked structure.
• reactive functional groups amino groups, phenolic hydroxyl groups, acid anhydride groups, mercapto groups, etc.
• component (D) examples include amine-based curing agents, phenol-based curing agents, acid anhydride-based curing agents, and thiol-based curing agents.
• amine-based curing agents are preferred, and examples of amine-based curing agents include aromatic polyamines, aliphatic polyamines, polyamidoamines, and polyether polyamines. Aromatic polyamines are even more preferred.
• the aromatic polyamines include compounds represented by the following formulas (I) to (IV).
• R is, independently of each other, a hydrogen atom or a monovalent alkyl group having 1 to 6 carbon atoms
• R' is, independently of each other, a hydrogen atom, a monovalent alkyl group having 1 to 12 carbon atoms, a phenyl group, or an aminophenyl group, and two R' may be bonded to form a ring structure together with the carbon atoms to which they are bonded.
• aromatic polyamines include aromatic diaminodiphenylmethane compounds such as 4,4'-diaminodiphenylmethane, 3,3'-diethyl-4,4'-diaminodiphenylmethane, 3,3',5,5'-tetramethyl-4,4'-diaminodiphenylmethane, 3,3',5,5'-tetraethyl-4,4'-diaminodiphenylmethane, 2,4-diaminotoluene, 1,4-diaminobenzene, 1,3-diaminobenzene, etc. These can be used alone or in combination of two or more.
• the amount of component (D) when the amount of component (A) is 100 parts by mass, the amount of component (D) is preferably 1 to 20 parts by mass, and more preferably 1 to 10 parts by mass. If the amount of component (D) is 20 parts by mass or less, the strength and adhesive power of the cured epoxy resin can be sufficiently obtained. In addition, since the decrease in Tg is suppressed, high heat resistance can be maintained. If the amount of component (D) is 1 part by mass or more, the desired effect of adding component (D) is sufficient.
• the epoxy resin composition of the present invention may further contain a filler (E).
• a filler examples include silicas such as fused silica, crystalline silica, and cristobalite, and metal oxides such as aluminum oxide, titanium oxide, and magnesium oxide, and may be used alone or in combination of two or more. Among them, silicas are preferred from the viewpoint of availability and quality stability.
• the average particle size is preferably 0.1 to 50 ⁇ m and can be selected depending on the application. The average particle size may be, for example, the volume average particle size measured by laser diffraction.
• the filler is preferably surface-treated in advance with a coupling agent such as a silane coupling agent.
• a coupling agent such as a silane coupling agent.
• additives may be added to the epoxy resin composition of the present invention as necessary in accordance with the object of the present invention.
• additives include reactive diluents, curing accelerators, flame retardants, ion trapping agents, antioxidants, adhesion aids, colorants, and coupling agents.
• the composition can be obtained by simultaneously mixing, stirring, dissolving and dispersing the (A), (B), (C) and (D) components while subjecting them to a heat treatment.
• the composition can be obtained by mixing, stirring, dissolving and dispersing the (A), (B), (C) or (D) components while separately subjecting them to a heat treatment.
• the (B), (C) and (D) components are mixed, stirred, dissolved and dispersed while being heat treated, and then the (A) component is added to obtain a composition in which the (B) component is well dispersed.
• component (E) and/or other additives may be added. It may be added to components (A), (B), (C) and (D) and mixed, stirred, dissolved and dispersed while being heated simultaneously or separately. Alternatively, components (B), (C) and (D) may be mixed, stirred, dissolved and dispersed while being heated, and then component (E) and/or other additives may be added simultaneously with component (A).
• the curing conditions for the epoxy resin composition of the present invention are not particularly limited, but may be, for example, heating at a temperature of 60 to 200°C, preferably 80 to 180°C, for 30 minutes to 10 hours, preferably 1 to 5 hours. In order to efficiently carry out the reaction, heating may be carried out for the above-mentioned time periods, for example, in 1 to 5 stages from low to high temperatures.
• Bisphenol A type epoxy resin jER828EL manufactured by Mitsubishi Chemical Corporation (Epoxy equivalent: 186 g/mol, viscosity: 13,000 mPa ⁇ s) (Hereinafter referred to as DGEBA.)
• Amine-based curing agent 4,4'-diaminodiphenylmethane (N-H equivalent: 49.6 g/mol) manufactured by Tokyo Chemical Industry Co., Ltd. (Hereinafter referred to as DDM.)
• Synthesis Example 2 Method for synthesizing SM epoxy resin 360 mL of ethanol, 17.9 g (0.164 mol) of p-aminophenol, 20 g (0.164 mol) of 4-allyloxybenzaldehyde, and a small amount of zinc chloride were added to a glass reactor, and the mixture was reacted in an oil bath at 60°C for 4 hours. The mixture was then allowed to stand in a refrigerator for 2 hours, and the precipitated crystals were separated by filtration to obtain 27 g of 4-((4-allyloxy)benzylideneamino)phenol.
• Example 1 The degassed DGEBA, Synthesis Example 1, and Synthesis Example 2 were placed in an aluminum cup and heated on a hot plate at 130° C. to reduce the viscosity. Then, a chemically equivalent amount of DDM was placed in the other aluminum cup and stirred on a hot plate at the same temperature until it was completely melted. The melted DDM was then added to the previously prepared aluminum cup and stirred for 5 minutes to prepare a composition. Thereafter, the aluminum cup containing the composition was heated and cured in three stages: at 120° C. for 2 hours, at 150° C. for 2 hours, and then at 180° C. for 2 hours. The temperature rise rate was 5° C./min. The blend amounts and physical properties of the cured product are shown in Table 1.
• Example 2 Synthesis Example 1, Synthesis Example 2, and DDM in a chemical equivalent amount to the total molten epoxy were added to an aluminum cup and stirred on a hot plate at 140° C. for 15 minutes. Next, the degassed DGEBA was placed in the other aluminum cup and heated on a hot plate at the same temperature to reduce the viscosity. The DGEBA with reduced viscosity was then added to the previously prepared aluminum cup and heated and stirred for 2 minutes to prepare a composition. The aluminum cup containing the composition was then heated and cured in a thermostatic chamber in three stages: 2 hours at 120° C., 2 hours at 150° C., and 2 hours at 180° C. The temperature rise rate was 5° C./min. The blend amounts and physical properties of the cured product are shown in Table 1.
• the composition prepared in each example was applied to 12.5 mm from the end of the mild steel plate, and another mild steel plate was placed on top of it and heated at 120°C for 2 hours at 5 MPa using a hot press. Then, a weight (weight: 1,700 g, pressure: 960 Pa) was placed on the test piece in a thermostatic bath, and the test piece was heated at 150°C for 2 hours, then heated to 180°C at a heating rate of 5°C/min, and heated and cured at 180°C for 2 hours to prepare a test piece. After gradual cooling, the test piece was taken out and the resin protruding from the joint was removed with a cutter knife.
• test pieces were subjected to a tensile shear adhesion test using an AGS-X manufactured by Shimadzu Corporation at a head speed of 50 mm/min.
• the fracture mode was confirmed by visual inspection.
• the compositions used for the evaluation and the results of the tensile shear adhesion test are shown in Table 2.
• the fracture mode was confirmed by visual inspection.
• the compositions used for the evaluation and the results of the T-peel test are shown in Table 2.
• the examples showed increased breaking strength and peel strength in the tensile shear adhesion test and T-peel test. This shows that the epoxy resin of the present invention is effective in improving the adhesive strength with the substrate, demonstrating the usefulness of the epoxy resin composition of the present invention.
• An epoxy resin composition comprising: (A) an epoxy resin containing two or more epoxy groups in one molecule; (B) a urethane bond-containing polyorganosiloxane represented by the following formula (1):
• R 1 's are each independently a group selected from an alkyl group having 1 to 12 carbon atoms, an aryl group having 6 to 12 carbon atoms, and an aralkyl group having 7 to 12 carbon atoms, or a hydroxyl group
• X's are each independently a divalent alkylene group having 1 to 10 carbon atoms
• Y's are each independently a group selected from an alkylene group having 5 to 30 carbon atoms which may have an ether bond, an arylene group having 6 to 30 carbon atoms, and an aralkylene group having 7 to 30 carbon atoms
• Z's are each independently an alkylene group having 1 to 20 carbon atoms which may have an ether bond
• n is an epoxy resin composition
• [2] The epoxy resin composition according to the above item [1], which contains 1 to 20 parts by mass of the (B) component and 1 to 20 parts by mass of the (C) component relative to 100 parts by mass of the (A) component.
• [3] The epoxy resin composition according to the above [1] or [2], characterized in that the number average molecular weight of the component (B) in terms of polystyrene standard is 500 to 100,000.
• [4] The epoxy resin composition according to any one of the above [1] to [3], characterized in that the epoxy equivalent (g/mol) of the (B) component is 300 to 5,000 g/mol.
• [5] The epoxy resin composition according to any one of [1] to [4] above, characterized in that the component (B) contains hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of 3,000 ppm or less.
• [6] The epoxy resin composition according to any one of [1] to [5] above, characterized in that the number average molecular weight of the component (C) in terms of polystyrene standard is 500 to 100,000.
• [7] The epoxy resin composition according to any one of [1] to [6] above, characterized in that the epoxy equivalent (g/mol) of the component (C) is 300 to 5,000 g/mol.
• [8] The epoxy resin composition according to any one of [1] to [7] above, characterized in that the component (C) contains hexamethylcyclotrisiloxane (D3), octamethylcyclotetrasiloxane (D4), decamethylcyclopentasiloxane (D5), and dodecamethylcyclohexasiloxane (D6) in a total amount of 3,000 ppm or less.
• D3 hexamethylcyclotrisiloxane
• D4 octamethylcyclotetrasiloxane
• D5 decamethylcyclopentasiloxane
• D6 dodecamethylcyclohexasiloxane
• the present invention is not limited to the above-described embodiments.
• the above-described embodiments are merely examples, and anything that has substantially the same configuration as the technical idea described in the claims of the present invention and provides similar effects is included within the technical scope of the present invention.

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• 2022
  • 2022-11-22 JP JP2022186143A patent/JP2024075032A/ja active Pending
• 2023
  • 2023-11-13 EP EP23894456.5A patent/EP4624508A1/en active Pending
  • 2023-11-13 CN CN202380079102.4A patent/CN120187776A/zh active Pending
  • 2023-11-13 WO PCT/JP2023/040675 patent/WO2024111447A1/ja not_active Ceased

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