Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/04—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent
  • C08J9/12—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent
  • C08J9/14—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof using blowing gases generated by a previously added blowing agent by a physical blowing agent organic
  • C08J9/143—Halogen containing compounds
  • C08J9/144—Halogen containing compounds containing carbon, halogen and hydrogen only
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C39/00—Shaping by casting, i.e. introducing the moulding material into a mould or between confining surfaces without significant moulding pressure; Apparatus therefor
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
  • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
  • B29C44/00—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles
  • B29C44/20—Shaping by internal pressure generated in the material, e.g. swelling or foaming ; Producing porous or cellular expanded plastics articles for articles of indefinite length
  • B29C44/32—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements
  • B29C44/321—Incorporating or moulding on preformed parts, e.g. linings, inserts or reinforcements the preformed part being a lining, e.g. a film or a support lining
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B15/00—Layered products comprising a layer of metal
  • B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B15/046—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of foam
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B29/00—Layered products comprising a layer of paper or cardboard
  • B32B29/002—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material
  • B32B29/007—Layered products comprising a layer of paper or cardboard as the main or only constituent of a layer, which is next to another layer of the same or of a different material next to a foam layer
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
  • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/022—Non-woven fabric
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/02—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by structural features of a fibrous or filamentary layer
  • B32B5/024—Woven fabric
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B5/00—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts
  • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B32—LAYERED PRODUCTS
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  • B32B5/18—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material
  • B32B5/20—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by features of a layer of foamed material foamed in situ
• • B—PERFORMING OPERATIONS; TRANSPORTING
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  • B32B5/22—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed
  • B32B5/24—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer
  • B32B5/245—Layered products characterised by the non- homogeneity or physical structure, i.e. comprising a fibrous, filamentary, particulate or foam layer; Layered products characterised by having a layer differing constitutionally or physically in different parts characterised by the presence of two or more layers which are next to each other and are fibrous, filamentary, formed of particles or foamed one layer being a fibrous or filamentary layer another layer next to it being a foam layer
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J9/00—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof
  • C08J9/0014—Use of organic additives
  • C08J9/0023—Use of organic additives containing oxygen
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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  • C08J9/0061—Working-up of macromolecular substances to porous or cellular articles or materials; After-treatment thereof characterized by the use of several polymeric components
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
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  • C08J9/141—Hydrocarbons
• • C—CHEMISTRY; METALLURGY
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  • C08J2203/18—Binary blends of expanding agents
  • C08J2203/182—Binary blends of expanding agents of physical blowing agents, e.g. acetone and butane
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2205/00—Foams characterised by their properties
  • C08J2205/04—Foams characterised by their properties characterised by the foam pores
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2205/00—Foams characterised by their properties
  • C08J2205/04—Foams characterised by their properties characterised by the foam pores
  • C08J2205/044—Micropores, i.e. average diameter being between 0,1 micrometer and 0,1 millimeter
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2205/00—Foams characterised by their properties
  • C08J2205/04—Foams characterised by their properties characterised by the foam pores
  • C08J2205/052—Closed cells, i.e. more than 50% of the pores are closed
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
  • C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
  • C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2361/00—Characterised by the use of condensation polymers of aldehydes or ketones; Derivatives of such polymers
  • C08J2361/04—Condensation polymers of aldehydes or ketones with phenols only
  • C08J2361/06—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols
  • C08J2361/08—Condensation polymers of aldehydes or ketones with phenols only of aldehydes with phenols with monohydric phenols
  • C08J2361/10—Phenol-formaldehyde condensates
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08J—WORKING-UP; GENERAL PROCESSES OF COMPOUNDING; AFTER-TREATMENT NOT COVERED BY SUBCLASSES C08B, C08C, C08F, C08G or C08H
  • C08J2471/00—Characterised by the use of polyethers obtained by reactions forming an ether link in the main chain; Derivatives of such polymers
  • C08J2471/02—Polyalkylene oxides

Definitions

• the present invention relates to a phenol resin foam and a method for producing the same.
• heat insulating materials for residential use fiber-based heat insulating materials such as glass wool and rock wool, or foamed plastic heat insulating materials obtained by foaming styrene, urethane and phenol resin are used.
• fiber-based heat insulating materials such as glass wool and rock wool, or foamed plastic heat insulating materials obtained by foaming styrene, urethane and phenol resin are used.
• foamed plastic heat insulating materials obtained by foaming styrene, urethane and phenol resin are used.
• the heat insulation performance of the foamed plastic heat insulating material is greatly influenced by the type and state of the foaming agent contained in the bubbles.
• chlorofluorocarbon which has a low thermal conductivity
• CFC chlorofluorocarbon
• the adopted Montreal Protocol provided for the abolition of use.
• HFC hydrofluorocarbon
• Conversion of foaming agents to foam-based foaming agents has been promoted.
• Hydrocarbon foaming agents are low in ozone depletion potential and global warming potential, and are excellent foaming agents from the viewpoint of environmental conservation.
• the hydrocarbon-based blowing agent is flammable, when it is used, it is necessary to make the production equipment explosion-proof, and the equipment tends to be very expensive.
• the combustible hydrocarbon foaming agent included in the air bubbles of the heat insulating material increases the combustibility of the foamed plastic heat insulating material.
• a heat insulating material having an oxygen index of 26% by volume or less is a designated combustible material, and thus has a problem that its storage place and storage method are limited.
• the heat insulating material increases the flame spread rate.
• Patent Documents 1, 2, 3, 4 and 5 many gas types are used as chlorinated or non-chlorinated hydrofluoroolefins having an ozone depletion coefficient of almost zero, a low global warming coefficient, and flame retardancy. Is disclosed.
• Patent Documents 1 to 5 many chlorinated or non-chlorinated hydrofluoroolefins are disclosed, among which 1-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoro -1-propene, 2,3,3,3-tetrafluoro-1-propene, 1,1,1,4,4,4-hexafluoro-2-butene has low ozone depletion potential and global warming potential, Furthermore, it has the feature of having flame retardancy.
• 1-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoro-1-propene, 2,3,3,3-tetrafluoro-1-propene, 1,1,1, 4,4,4-Hexafluoro-2-butene has a high affinity with phenolic resin, so the closed cell ratio is reduced and the diffusion rate of the foaming agent to the outside of the foam is high. There is a concern that the change in conductivity over time may increase.
• An object of the present invention is to provide a phenolic resin foam excellent in flame retardancy and capable of maintaining excellent heat insulation performance over a long period of time while suppressing environmental load, and a method for producing the same.
• the present inventors have achieved excellent flame retardancy and further superiority while suppressing environmental burden by using chlorinated or non-chlorinated hydrofluoroolefin as a foaming agent.
• the inventors have found that a phenol resin foam capable of maintaining the heat insulation performance over a long period of time and a method for producing the phenol resin foam have been found, and have completed the present invention. That is, the present invention relates to the following.
• the blowing agent is 1-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoro-1-propene, 2,3,3,3-tetrafluoro-1-
• the phenol resin foam according to any one of [1] to [4], comprising at least one olefin selected from the group consisting of propene and 1,1,1,4,4,4-hexafluoro-2-butene body.
• a method for producing a phenol resin foam comprising a step of foaming and curing a foamable phenol resin composition containing a phenol resin, a surfactant, a curing catalyst and a foaming agent on a face material,
• the foaming agent contains at least one of chlorinated hydrofluoroolefin or non-chlorinated hydrofluoroolefin,
• the weight average molecular weight Mw of the phenol resin is 400 or more and 3000 or less
• the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of the phenol resin is 1.5 or more and 6.0 or less
• the weight average molecular weight A method wherein Mw and the number average molecular weight Mn are values determined by gel permeation chromatography.
• the foamable phenol resin composition is a mixture containing a phenol resin raw material containing the phenol resin and water, the surfactant, the curing catalyst, and the foaming agent, and the phenol resin raw material.
• the phenol resin foam which is excellent in a flame retardance and can maintain the outstanding heat insulation performance over a long period of time, using the foaming agent with a very low ozone depletion coefficient and a global warming coefficient, and its manufacture A method can be provided.
• the present embodiment a mode for carrying out the present invention (hereinafter referred to as “the present embodiment”) will be described in detail.
• the present invention is not limited to the following embodiments.
• the phenol resin foam of this embodiment contains a cured phenol resin and a foaming agent containing at least one of chlorinated hydrofluoroolefin (hydrochlorofluoroolefin) or non-chlorinated hydrofluoroolefin (hydrofluoroolefin). To do.
• Chlorinated or non-chlorinated hydrofluoroolefins include 1-chloro-3,3,3-trifluoropropene, 1,3,3,3-tetrafluoro-1-propene, 2,3,3,3-tetra Preference is given to at least one olefin selected from the group consisting of fluoro-1-propene and 1,1,1,4,4,4-hexafluoro-2-butene.
• the foaming agent in the phenol resin foam may contain at least one chlorinated or non-chlorinated hydrofluoroolefin, and may contain two or more chlorinated or non-chlorinated hydrofluoroolefins.
• the density of the phenol resin foam in the present embodiment is 10 kg / m 3 or more and 150 kg / m 3 or less, preferably 15 kg / m 3 or more and 70 kg / m 3 or less, more preferably 15 kg / m 3 or more and 40 kg / m 3 or less. m 3 or less, more preferably 20 kg / m 3 or more and 35 kg / m 3 or less, and most preferably 20 kg / m 3 or more and 28 kg / m 3 or less.
• the density is lower than 10 kg / m 3 , the strength is low, and the foam is easily damaged during transportation or construction. Moreover, when the density is low, the bubble film tends to be thin.
• the foaming agent in the foam will be easily replaced with air, and the cell membrane will be easily broken during foaming, making it difficult to obtain a high closed cell structure. Tends to decrease. On the other hand, if the density is higher than 150 kg / m 3, the heat conduction of solids derived from solid components including a phenol resin increases, so that the heat insulation performance tends to be lowered.
• the thermal conductivity measured in an environment of 10 ° C. of the phenol resin foam in the present embodiment is 0.0175 W / m ⁇ k or less, preferably 0.0170 W / m ⁇ k or less, more preferably 0.0165 W / m ⁇ k or less.
• the lower limit of the thermal conductivity measured in an environment of 10 ° C. of the phenol resin foam is not particularly limited, but is usually about 0.014 W / m ⁇ k.
• the thermal conductivity of the phenol resin foam in the present embodiment is 0.0185 W / m ⁇ k or less, preferably 0.0180 W / m ⁇ k or less, more preferably. Is 0.0175 W / m ⁇ k or less.
• the lower limit of the thermal conductivity measured under the environment of 23 ° C. of the phenol resin foam is not particularly limited, but is usually about 0.015 W / m ⁇ k. The method for measuring the thermal conductivity will be specifically described in the examples described later.
• the oxygen index of the phenol resin foam in the present embodiment is preferably 28% by volume or more, more preferably 29% by volume or more, still more preferably 32% by volume or more, and particularly preferably 34% by volume or more. And most preferably at least 35% by volume. If the oxygen index is lower than 28% by volume, if a fire occurs in a building with a foam-containing heat insulating material, the heat insulating material may increase the flame spread rate.
• the part which can be constructed may be limited.
• the composite plate may become a designated combustible material having an oxygen index of 26% by volume or less, and there are restrictions on its storage location and storage method. There is also a concern that it will be.
• the thermal conductivity of the phenol resin foam in an environment of 10 ° C. after standing for 14 days in an atmosphere of 110 ° C. is preferably 0.0185 W / m ⁇ k or less, more preferably 0.0180 W / m ⁇ k or less. More preferably, it is 0.0175 m ⁇ k or less.
• the lower limit of the thermal conductivity is not particularly limited, but is usually about 0.016 W / m ⁇ k.
• the closed cell ratio of the phenol resin foam in the present embodiment is preferably 90% or more, more preferably 95% or more, and particularly preferably 97% or more and 100% or less. If the closed cell rate is too low, the foaming agent contained in the bubbles will be easily replaced with air, so that the thermal conductivity will increase after a long period of time and the bubble film will be easily broken, so the compression strength will be low. There is a tendency to.
• the average cell diameter of the phenol resin foam in the present embodiment is preferably 50 ⁇ m to 200 ⁇ m, more preferably 50 ⁇ m to 150 ⁇ m, still more preferably 60 ⁇ m to 110 ⁇ m, and particularly preferably 60 ⁇ m to 90 ⁇ m. If the average bubble diameter is too large, the convection of the gas in the bubble and the heat blocking by the bubble film are reduced, so that the initial heat insulation performance tends to deteriorate. If the average cell diameter is too small, the individual bubble membranes become thin, and the compressive strength tends to decrease.
• the phenol resin foam in this embodiment may have large-diameter holes called voids partially.
• the void is considered to be formed by coalescence of bubbles, non-uniform vaporization of the foaming agent, or gel or foreign matter derived from a high molecular weight component in the resin.
• voids are defined as follows. That is, when a phenol resin foam is cut so that the plane is cut out and the area of the gap existing in the cut plane (cross section) is measured, a void having an area of 2 mm 2 or more is defined as a void. .
• the phenolic resin foam is a plate-like body, for example, a cross section parallel to the front and back surfaces (a plane perpendicular to the thickness direction) is cut out from the center of the foaming direction (thickness direction) and the area of the void is measured. Can do.
• the void area ratio of the phenol resin foam is the ratio of the area of the void in the cross section to the area of the cross section of the phenol resin foam.
• the void area ratio of the phenol resin foam is preferably 0.2% or less, more preferably 0.1% or less, further preferably 0.08% or less, and particularly preferably 0.05% or less.
• the phenol resin foam of the present embodiment foams and cures a foamable phenol resin composition containing a phenol resin raw material containing a phenol resin, a surfactant, a phenol resin curing catalyst, and a foaming agent.
• a foamable phenol resin composition containing a phenol resin raw material containing a phenol resin, a surfactant, a phenol resin curing catalyst, and a foaming agent.
• the voids of the foam are mainly formed by the vaporized foaming agent.
• the foaming agent in the phenol resin foam of the present embodiment contains at least one of chlorinated hydrofluoroolefin and non-chlorinated hydrofluoroolefin.
• the total content of chlorinated or non-chlorinated hydrofluoroolefins contained in the foaming agent is preferably 30% by mass or more, more preferably 50% by mass or more, based on the total mass of the foaming agent. More preferably, it is 60 mass% or more, Especially preferably, it is 70 mass% or more, Most preferably, it is 80 mass% or more and 100 mass% or less.
• the content of the chlorinated or non-chlorinated hydrofluoroolefin contained in the foaming agent is less than 30% by mass, the heat insulating performance and flame retardancy tend to be lowered.
• the foaming agent may contain a compound other than the chlorinated or non-chlorinated hydrofluoroolefin.
• a compound other than the chlorinated or non-chlorinated hydrofluoroolefin for example, cyclic or chain alkanes, alkenes, and alkynes having 3 to 7 carbon atoms can be used as the blowing agent.
• compounds such as normal butane, isobutane, cyclobutane, normal pentane, isopentane, cyclopentane, neopentane, normal hexane, isohexane, 2,2-dimethylbutane, 2,3-dimethylbutane, and cyclohexane are included in the blowing agent.
• compounds selected from pentanes such as normal pentane, isopentane, cyclopentane and neopentane, and butanes such as normal butane, isobutane and cyclobutane are preferably used.
• the amount of the foaming agent added to the phenol resin foam of this embodiment is preferably 3.0 to 25.0 parts by mass with respect to 100 parts by mass of the total amount of the phenol resin (or phenol resin raw material) and the surfactant. Parts, more preferably 5.0 parts by weight to 22.5 parts by weight, still more preferably 6.5 parts by weight to 22.5 parts by weight, and particularly preferably 7.5 parts by weight to 21.5 parts by weight.
• the content of the foaming agent is less than 3.0 parts by mass, it is very difficult to obtain a necessary foaming ratio, and a high-density foam tends to be formed.
• the content of the foaming agent exceeds 25.0 parts by mass, the viscosity of the phenol resin composition is lowered due to the plasticizing effect of the foaming agent, and excessive foaming occurs. The rate tends to decrease.
• the closed cell ratio decreases, physical properties such as long-term heat insulation performance and compressive strength tend to decrease.
• the phenol resin foam of the present embodiment includes, for example, a step of foaming and curing a foamable phenol resin composition containing a phenol resin raw material containing a phenol resin, a surfactant, a curing catalyst, and a foaming agent on a face material. It can be manufactured by the method.
• the blowing agent comprises at least one chlorinated or non-chlorinated hydrofluoroolefin.
• the weight average molecular weight Mw of the phenol resin determined by gel permeation chromatography is 400 or more and 3000 or less.
• the ratio Mw / Mn of the weight average molecular weight Mw to the number average molecular weight Mn of the phenol resin is 1.5 or more and 6.0 or less.
• the moisture content of the phenol resin raw material is 1% by mass or more and 20% by mass or less.
• the phenol resin raw material includes a phenol resin as a main component, water, and, in some cases, other components.
• the phenol resin raw material immediately after synthesis of the phenol resin usually contains excess water. Therefore, the phenol resin raw material can be used for the preparation of a foamable phenol resin composition after dehydrating to a predetermined moisture content.
• the moisture content of the phenol resin raw material is preferably 1% by mass or more and 20% by mass or less, more preferably 1% by mass or more and 15% by mass or less, and further preferably 2% by mass or more and 10% by mass based on the mass of the phenol resin raw material.
• the moisture content in the phenolic resin raw material is less than 1% by mass, the phenolic resin raw material becomes too high in viscosity so that the equipment can be enlarged to withstand high pressure, and the phenolic resin composition can be expanded and foamed. Since the latent heat of vaporization due to moisture cannot be fully utilized at the time of curing, the phenol resin composition heats up abnormally, and the closed cell ratio tends to decrease.
• the phenol resin in the present embodiment is typically a condensation polymer of phenol and formaldehyde.
• a phenol resin can be obtained, for example, by using phenol and formaldehyde as raw materials and polymerizing them with an alkali catalyst in a temperature range of 40 to 100 ° C.
• the weight average molecular weight Mw determined by gel permeation chromatography of the phenol resin obtained by polymerization is usually 400 or more and 3000 or less, preferably 500 or more and 2500 or less, more preferably 700 or more and 2500 or less, and still more preferably 1000 or more. 2000 or less, and most preferably 1500 or more and 2000 or less.
• the weight average molecular weight Mw is smaller than 400, many addition reaction sites remain in the phenol nucleus, and thus the calorific value after mixing the curing catalyst with the phenol resin increases. Therefore, the phenol resin composition plasticized with chlorinated or non-chlorinated hydrofluoroolefin becomes high temperature, and the viscosity further decreases.
• the compressive strength can be improved to some extent by a method of increasing the addition amount of the acidic curing catalyst or a method of increasing the temperature and / or the amount of hot air supplied from the outside such as an oven.
• the ratio Mw / Mn (molecular weight distribution) between the weight average molecular weight Mw and the number average molecular weight Mn determined by gel permeation chromatography of the phenol resin in the present embodiment is 1.5 or more and 6.0 or less, and 2.0 or more. It is preferably 5.5 or less, more preferably 2.2 or more and 5.0 or less, further preferably 2.7 or more and 4.5 or less, and most preferably 3.0 or more and 4.0 or less. preferable.
• the molecular weight distribution is less than 1.5, the bubble film is likely to be broken during foaming, so that the closed cell ratio is lowered.
• the compressive strength decreases and the long-term performance of thermal conductivity tends to decrease.
• the viscosity of the phenol resin (or phenol resin raw material) in this embodiment is preferably 5000 mPa ⁇ s or more and 100000 mPa ⁇ s or less at 40 ° C. Further, from the viewpoint of improving the closed cell ratio and decreasing the average cell diameter, the viscosity is more preferably 7000 mPa ⁇ s to 50000 mPa ⁇ s, and particularly preferably 7000 mPa ⁇ s to 30000 mPa ⁇ s. If the viscosity of the phenolic resin (or phenolic resin raw material) is too low, the bubble nuclei in the foamable phenolic resin composition will be united and the bubble diameter tends to be too large.
• the cell membrane is easily broken by the foaming pressure, the closed cell rate tends to decrease. If the viscosity of the phenol resin (or phenol resin raw material) is too high, the foaming speed becomes slow, and it tends to be difficult to obtain the necessary foaming ratio.
• the foamable phenolic resin composition of the present embodiment may contain additives in addition to the components described above.
• urea When urea is added, urea may be added directly to the reaction solution during or near the end point of the reaction of the phenol resin, as is generally known, or urea previously methylolated with an alkali catalyst may be added. You may mix with a phenol resin.
• additives other than urea for example, phthalic esters generally used as plasticizers, and glycols such as ethylene glycol and diethylene glycol can be used.
• content of an additive 0.5 mass part or more and 20 mass parts or less are desirable with respect to 100 mass parts of phenol resin (or phenol resin raw material).
• these additives are added too much, the viscosity of the phenol resin is remarkably lowered, and foam breakage is induced at the time of foam hardening.
• the meaning which contains an additive will fade. For this reason, content of an additive becomes like this. More preferably, they are 1.0 mass part or more and 10 mass parts or less.
• the present embodiment provides a phenolic resin foam that sufficiently utilizes the flame retardancy of the phenolic resin by using at least one chlorinated or non-chlorinated hydrofluoroolefin as a foaming agent for the phenolic resin.
• the following flame retardant may be added to the phenol resin composition.
• the flame retardant examples include bromine compounds such as tetrabromobisphenol A and decabromodiphenyl ether, phosphorus or phosphorus compounds such as aromatic phosphate esters, aromatic condensed phosphate esters, halogenated phosphate esters and red phosphorus, ammonium polyphosphate And antimony compounds such as antimony trioxide and antimony pentoxide, metal hydroxides such as aluminum hydroxide and magnesium hydroxide, and carbonates such as calcium carbonate and sodium carbonate.
• bromine compounds such as tetrabromobisphenol A and decabromodiphenyl ether
• phosphorus or phosphorus compounds such as aromatic phosphate esters, aromatic condensed phosphate esters, halogenated phosphate esters and red phosphorus
• antimony compounds such as antimony trioxide and antimony pentoxide
• metal hydroxides such as aluminum hydroxide and magnesium hydroxide
• carbonates such as calcium carbonate and sodium
• the surfactant As the surfactant, those generally used for the production of a phenol resin foam can be used, and among them, nonionic surfactants are effective.
• the surfactant is a polyoxyalkylene (alkylene oxide) which is a copolymer of ethylene oxide and propylene oxide, a condensate of alkylene oxide and castor oil, a condensate of alkylene oxide and alkylphenol such as nonylphenol or dodecylphenol.
• the amount of the surfactant is not particularly limited, but is preferably 0.3 to 10 parts by mass with respect to 100 parts by mass of the phenol resin (or phenol resin
• the curing catalyst may be an acidic curing catalyst that can cure the phenol resin, but an acid anhydride curing catalyst is preferable.
• an acid anhydride curing catalyst phosphoric anhydride and aryl sulfonic anhydride are preferable.
• aryl sulfonic anhydride examples include toluene sulfonic acid, xylene sulfonic acid, phenol sulfonic acid, substituted phenol sulfonic acid, xylenol sulfonic acid, substituted xylenol sulfonic acid, dodecyl benzene sulfonic acid, benzene sulfonic acid, and naphthalene sulfonic acid. These may be used alone or in combination of two or more. Further, resorcinol, cresol, saligenin (o-methylolphenol), p-methylolphenol and the like may be added as a curing aid.
• these curing catalysts may be diluted with a solvent such as ethylene glycol or diethylene glycol.
• the amount of the curing catalyst is not particularly limited, but is preferably 3 to 30 parts by mass with respect to 100 parts by mass of the total amount of the phenol resin (or phenol resin raw material) and the surfactant.
• a foamable phenol resin composition can be obtained by mixing the phenol resin raw material, the curing catalyst, the foaming agent, and the surfactant in the proportions described above.
• a foamed phenolic resin composition can be obtained by foaming and curing the resulting foamable phenolic resin composition as described below.
• the phenol resin foam is, for example, continuously discharged on the face material that travels the foamable phenol resin composition described above, and the surface of the foamable phenol resin composition that is opposite to the face in contact with the face material. It can be obtained by a continuous production method including covering the surface with another face material and foaming and heat-curing the foamable phenol resin composition.
• the foamable phenolic resin composition described above can be obtained by a batch production system in which the foamed phenolic resin composition is poured into a mold whose inside is coated with a face material or a release agent, and foamed and heat-cured. .
• the phenol resin foam obtained by the batch production method can be sliced and used as necessary.
• the face material sandwiching the phenol resin foam is a sheet-like base material, and preferably has flexibility for the purpose of preventing breakage of the face material during production.
• the face material having flexibility include synthetic fiber nonwoven fabric, synthetic fiber woven fabric, glass fiber paper, glass fiber woven fabric, glass fiber nonwoven fabric, glass fiber mixed paper, paper, metal film, or a combination thereof.
• These face materials may contain a flame retardant in order to impart flame retardancy.
• the flame retardant examples include bromine compounds such as tetrabromobisphenol A and decabromodiphenyl ether, phosphorus or phosphorus compounds such as aromatic phosphate esters, aromatic condensed phosphate esters, halogenated phosphate esters and red phosphorus, ammonium polyphosphate And antimony compounds such as antimony trioxide and antimony pentoxide, metal hydroxides such as aluminum hydroxide and magnesium hydroxide, and carbonates such as calcium carbonate and sodium carbonate. These flame retardants may be kneaded into the fibers of the face material, and may be added to a binder such as acrylic, polyvinyl alcohol, vinyl acetate, epoxy, or unsaturated polyester.
• a binder such as acrylic, polyvinyl alcohol, vinyl acetate, epoxy, or unsaturated polyester.
• the face material can be surface-treated with a water repellent or an asphalt waterproofing agent such as a fluororesin system, a silicone resin system, a wax emulsion system, a paraffin system, and an acrylic resin paraffin wax combined system.
• a water repellent or an asphalt waterproofing agent such as a fluororesin system, a silicone resin system, a wax emulsion system, a paraffin system, and an acrylic resin paraffin wax combined system.
• the gas permeability of the face material is preferably high.
• a synthetic fiber nonwoven fabric, a glass fiber paper, a glass fiber nonwoven fabric, papers, a metal film in which holes are formed in advance, and the like are preferably used.
• a surface material having gas permeability such as the transmittance of oxygen conforms to ASTM D3985-95 measurement is 4.5cm 3 / 24h ⁇ m 2 or more is particularly preferable.
• the weight per unit area is preferable. Is 15 to 200 g / m 2 , more preferably 15 to 150 g / m 2 , still more preferably 15 to 100 g / m 2 , particularly preferably 15 to 80 g / m 2 , and most preferably 15 to 60 g / m 2 .
• the basis weight is preferably 30 to 600 g / m 2 , more preferably 30 to 500 g / m 2 , further preferably 30 to 400 g / m 2 , particularly preferably 30 to 350 g / m 2 , most preferably Preferably, it is 30 to 300 g / m 2 .
• the foam phenolic resin composition sandwiched between two face materials can foam between the two face materials.
• the following first oven and second oven can be used.
• the phenolic resin composition is foamed and cured in an atmosphere of 60 to 110 ° C.
• an endless steel belt type double conveyor or a slat type double conveyor is used.
• an uncured foam can be cured while being formed into a plate shape to obtain a partially cured foam.
• the first oven may not have a uniform temperature over the entire region, and a plurality of temperature zones may be provided.
• the second oven is preferably one that generates hot air of 70 to 120 ° C. to post-cure the foam partially cured in the first oven.
• Partially cured foam boards may be stacked at regular intervals using spacers or trays. If the temperature in the second oven is too high, foaming pressure may be induced because the pressure of the foaming agent inside the foam bubbles becomes too high. If the temperature in the second oven is too low, it may take too much time for the phenol resin reaction to proceed. Therefore, the temperature in the second oven (hot air temperature) is more preferably 80 to 110 ° C.
• the foaming and curing method of the foamable phenol resin composition for obtaining the phenol resin foam of the present embodiment is not limited to the method described above.
• a phenol resin foam that has a low environmental load, is excellent in flame retardancy, and can maintain excellent thermal insulation performance over a long period of time.
• Foam density The foam density of the phenol resin foam was measured according to JIS-K-7222. A 20 cm square board cut out from the obtained phenolic resin foam was used as a sample. Surface materials such as face materials and siding materials were removed from the sample, the mass and apparent volume of the remaining foam sample were measured, and the foam density was determined from these values.
• the average cell diameter of the phenol resin foam was measured by the following method.
• a photograph was obtained by cutting almost the center in the thickness direction of the phenol resin foam in parallel with the front and back surfaces and enlarging the cut cross section by 50 times.
• Four straight lines having a length of 9 cm were drawn at arbitrary positions in the obtained photograph, and the average value of the number of bubbles crossed by each straight line was obtained.
• the average bubble diameter is a value calculated by dividing 1,800 ⁇ m by the average value of the number of crossed bubbles.
• the closed cell ratio of the phenol resin foam was measured by the following method with reference to ASTM-D-2856-94 (1998) A method. From a central part in the thickness direction of the foam, a cube specimen of about 25 mm square was cut out. If a specimen with a uniform thickness of 25 mm cannot be obtained due to the thin foam, slice the approximately 25 mm square cube specimen surface by about 1 mm to produce a specimen with a uniform thickness. did. The length of each side was measured with a vernier caliper, the apparent volume (V1: cm 3 ) was measured, and the mass of the specimen (W: 4 significant digits, g) was measured.
• the closed space volume (V2: cm 3 ) of the specimen was measured using an air pycnometer (Tokyo Science Co., Ltd., trade name “MODEL1000”) according to the method described in Method A of ASTM-D-2856.
• the bubble diameter (t: cm) was measured according to the above-mentioned (2) method of measuring the average bubble diameter.
• Void area ratio A substantially central portion in the thickness direction of the phenol resin foam was cut in parallel to the front and back surfaces, and a photograph or a color copy in which a 100 mm ⁇ 150 mm range of the cut cross section was enlarged to 200% was taken. In a photograph or copy drawing taken, each length and width are twice the actual size, and the area is four times the actual area. A transparent graph paper was overlaid on the photograph or copy drawing, a large diameter bubble was selected, and the cross-sectional area of the bubble was measured using the grid of the graph paper. A hole in which a 1 mm ⁇ 1 mm square continuously exists over 8 squares was determined as a void.
• the area of the void observed in the photograph or copy drawing was integrated, and the area fraction (void area ratio) was calculated from the integrated area of the void. Since the image is enlarged to 200%, 8 squares correspond to an area of 2 mm 2 in the actual foam cross section.
• the void area ratio was measured 12 times for the samples under the same production conditions, and the average value thereof was taken as the representative value of the foam obtained under the production conditions.
• the thermal conductivity was measured using one specimen and a symmetrical configuration type measuring device (Hideki Seiki Co., Ltd., trade name “HC-074 / 600”).
• the thermal conductivity in the environment of 10 ° C is the condition that the low temperature plate is 0 ° C and the high temperature plate is 20 ° C.
• the thermal conductivity in the environment of 23 ° C is the condition that the low temperature plate is 13 ° C and the high temperature plate is 33 ° C. Each was measured.
• HYDRANAL-Composite 5K manufactured by Sigma-Aldrich was used as a Karl Fischer reagent
• HAYASHI-Solvent CE dehydrated solvent (for ketones) manufactured by Hayashi Pure Chemical Industries was used for Karl Fischer titration.
• Aquamicron standard water / methanol (water content 2 mg) manufactured by Mitsubishi Chemical was used for titer measurement of Karl Fischer reagent.
• the water content was measured using Method 1 set in the apparatus, and the Karl Fischer reagent titer was determined using Method 5.
• the ratio of the obtained water content to the mass of the phenol resin raw material was determined, and this was used as the water content of the phenol resin raw material.
• Viscosity of phenol resin or phenol resin raw material After being stabilized at 40 ° C. for 3 minutes using a rotational viscometer (manufactured by Toki Sangyo Co., Ltd., R-100 type, rotor part is 3 ° ⁇ R-14) The viscosity value was taken as the measured value.
• Weight average molecular weight Mw and ratio Mw / Mn (molecular weight distribution) of weight average molecular weight Mw to number average molecular weight Mn Gel permeation chromatography (GPC) was measured under the following conditions.
• the weight average molecular weight Mw and the number average molecular weight Mn were determined from the obtained chromatogram and a calibration curve obtained from the relationship between the elution time and molecular weight of the standard substances (standard polystyrene, 2-hydroxybenzyl alcohol and phenol) described later. . Further, the molecular weight distribution Mw / Mn was calculated from these values.
• Preprocessing About 10 mg of phenol resin was dissolved in 1 ml of N, N dimethylformamide (manufactured by Wako Pure Chemical Industries, Ltd., for high performance liquid chromatograph), and 0.2 ⁇ m membrane filter filtered was used as a measurement solution.
• Measurement condition Measuring device: Shodex System 21 (made by Showa Denko KK) Column: Shodex asahipak GF-310HQ (7.5 mm ID x 30 cm)
• Eluent A solution in which lithium bromide was dissolved in N, N dimethylformamide (manufactured by Wako Pure Chemical Industries, Ltd., for high performance liquid chromatograph) at a concentration of 0.1% by mass was used as the eluent.
• GC / MS measurement conditions GC / MS was measured as follows. Gas chromatography was an Agilent 7890 type manufactured by Agilent Technologies, and InertCap 5 (inner diameter 0.25 mm, film thickness 5 ⁇ m, length 30 m) manufactured by GL Sciences was used as the column.
• the carrier gas was helium and the flow rate was 1.1 ml / min.
• the inlet temperature was 150 ° C.
• the injection method was the split method (1:50), and the sample injection volume was 100 ⁇ l.
• the column temperature was first held at ⁇ 60 ° C. for 5 minutes, then heated to 150 ° C. at 50 ° C./min and held for 2.8 minutes.
• Q1000GC type manufactured by JEOL Ltd. was used.
• the ionization method was an electron ionization method (70 eV)
• voltage ⁇ 1300 V ion source temperature 230 ° C.
• interface temperature 150 ° C. and mass spectrometry was performed.
• the reaction solution was cooled and 400 kg of urea was added. Thereafter, the reaction solution was cooled to 30 ° C., and a 50% by mass aqueous solution of paratoluenesulfonic acid monohydrate was added until the pH reached 6.4.
• the obtained reaction solution was concentrated by a thin film evaporator to obtain a phenol resin raw material A containing a phenol resin.
• the obtained phenol resin raw material A had a moisture content of 7.8% by mass and a viscosity of 21000 mPa ⁇ s.
• reaction solution was cooled to 30 ° C., and a 50% by mass aqueous solution of paratoluenesulfonic acid monohydrate was added until the pH reached 6.4.
• the obtained reaction liquid was concentrated by a thin film evaporator to obtain a phenol resin raw material B containing a phenol resin.
• the obtained phenol resin raw material B had a moisture content of 2.4% and a viscosity of 8800 mPa ⁇ s.
• Example 1 Production of phenol resin foam A composition containing 50% by mass and 50% by mass of an ethylene oxide-propylene oxide block copolymer and polyoxyethylene dodecyl phenyl ether, respectively, with respect to 100 parts by mass of the phenol resin raw material A.
• the surfactant was mixed at a ratio of 3.0 parts by mass.
• the foamable phenol resin composition was introduced into a slat type double conveyor heated to 85 ° C. together with the face material, and was cured in a residence time of 15 minutes. Thereafter, the phenol resin composition was post-cured by heating in an oven at 110 ° C. for 2 hours to obtain a plate-like phenol resin foam.
• a glass fiber non-woven fabric (“Dura Glass Type DH 70” manufactured by Jones Manville Co., Ltd., basis weight 70 g / m 2 ) was used.
• Example 2 Except for changing the foaming agent to 1,3,3,3-tetrafluoro-1-propene and adding 8 parts by mass of the foaming agent to 100 parts by mass of the mixture of the surfactant and the phenol resin raw material. A phenol resin foam was obtained in the same manner as in Example 1.
• Example 3 The foaming agent was changed to 1,1,1,4,4,4-hexafluoro-2-butene, and 14 parts of the foaming agent was added to 100 parts by weight of the mixture with the phenol resin raw material mixed with the surfactant. A phenol resin foam was obtained in the same manner as in Example 1 except that part by mass was added.
• Example 4 The foaming agent was changed to 2,3,3,3-tetrafluoro-1-propene, and 8 parts by mass of the foaming agent was added to 100 parts by mass of the phenol resin raw material mixed with the surfactant. Except for this, a phenol resin foam was obtained in the same manner as in Example 1.
• Example 5 The same as in Example 1 except that the phenol resin raw material was changed to the phenol resin raw material C and that 10 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material C mixed with the surfactant. Thus, a phenol resin foam was obtained.
• Example 6 Other than changing the foaming agent to a gas in which 1-chloro-3,3,3-trifluoropropene and cyclopentane were mixed at a molar ratio of 90% and 10%, and the phenol resin raw material was changed to the phenol resin raw material D Obtained a phenol resin foam in the same manner as in Example 1.
• Example 7 Change of foaming agent to 1,3,3,3-tetrafluoro-1-propene, change of phenol resin raw material to phenol resin raw material E, mixture with phenol resin raw material E mixed with surfactant 100 A phenol resin foam was obtained in the same manner as in Example 1 except that 9 parts by mass of the foaming agent was added to parts by mass.
• Example 8 The same as Example 1 except that the phenol resin raw material was changed to the phenol resin raw material F and that 12 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material F mixed with the surfactant. Thus, a phenol resin foam was obtained.
• Example 9 Change of foaming agent to 1,3,3,3-tetrafluoro-1-propene, change of phenol resin raw material to phenol resin raw material G, mixture with phenol resin raw material G mixed with surfactant 100 A phenol resin foam was obtained in the same manner as in Example 1 except that 8 parts by mass of the foaming agent was added to parts by mass.
• Example 10 A phenol resin foam was obtained in the same manner as in Example 1 except that the phenol resin material was changed to the phenol resin material H.
• Example 11 The foaming agent was changed to a gas in which 1-chloro-3,3,3-trifluoropropene and cyclopentane were mixed at a molar ratio of 50% and 50%, the phenol resin raw material was changed to the phenol resin raw material H, A phenol resin foam was obtained in the same manner as in Example 1 except that 10 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material H mixed with the surfactant.
• Example 12 The foaming agent was changed to a gas in which 1,1,1,4,4,4-hexafluoro-2-butene and cyclopentane were mixed at a molar ratio of 90% and 10%, and the phenol resin raw material was changed to phenol resin raw material I.
• a phenol resin foam was obtained in the same manner as in Example 1 except that 14 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material I mixed with the surfactant. It was.
• Example 13 The same as in Example 1 except that the phenol resin raw material was changed to the phenol resin raw material J and that 10 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material J mixed with the surfactant. Thus, a phenol resin foam was obtained.
• Example 14 The blowing agent was changed to a gas in which 1-chloro-3,3,3-trifluoropropene and cyclopentane were mixed at a molar ratio of 60% and 40%, the phenol resin raw material was changed to a phenol resin raw material K, A phenol resin foam was obtained in the same manner as in Example 1 except that 10 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material K mixed with the surfactant.
• Example 15 The foaming agent was changed to a gas in which 1-chloro-3,3,3-trifluoropropene and isopentane were mixed at a molar ratio of 85% and 15%, the phenol resin raw material was changed to the phenol resin raw material L, the interface A phenol resin foam was obtained in the same manner as in Example 1 except that 10 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material L mixed with the activator.
• Example 16 Except that 13 parts by mass of 1-chloro-3,3,3-trifluoropropene as a foaming agent was added to 100 parts by mass of the mixture of the surfactant and the phenol resin raw material, the same as in Example 1.
• a foamable phenolic resin composition was obtained.
• the foamable phenolic resin composition was poured into an aluminum mold having an inner dimension of 1000 mm, a width of 1000 mm, and a thickness of 1000 mm, the inside of which was covered with a face material, and was sealed. The periphery and upper and lower surfaces of the mold were fixed with clamps so as not to spread due to foaming pressure. It was introduced into an oven heated to 85 ° C. and cured for 60 minutes.
• the phenol resin foam was taken out from the mold and heated in an oven at 110 ° C. for 2 hours to obtain a block-shaped phenol resin foam.
• the used face material is the same as in Example 1.
• the obtained block-shaped phenol resin foam was sliced at a thickness of 50 mm from the center in the thickness direction to obtain a plate-shaped foam.
• Example 17 For 100 parts by mass of a mixture of a surfactant and a phenol resin raw material, a gas obtained by mixing 1-chloro-3,3,3-trifluoropropene and isopentane as foaming agents at a molar ratio of 85% and 15% was 13 A plate-like phenolic resin foam was obtained in the same manner as in Example 16 except for adding part by mass.
• Example 18 With respect to 100 parts by mass of a mixture of a surfactant and a phenol resin raw material, a gas in which 1-chloro-3,3,3-trifluoropropene and cyclopentane as foaming agents are mixed at a molar ratio of 90% and 10% is used. A plate-like phenolic resin foam was obtained in the same manner as in Example 16 except that 14 parts by mass was added.
• Example 2 The foaming agent is changed to isopentane, and the phenol resin foaming is performed in the same manner as in Example 1 except that 9 parts by weight of the foaming agent is added to 100 parts by weight of the mixture with the phenol resin raw material A mixed with the surfactant. Got the body.
• Example 5 The same as in Example 1 except that the phenol resin raw material was changed to the phenol resin raw material O and that 13 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material O mixed with the surfactant. Thus, a phenol resin foam was obtained.
• Example 6 The same as in Example 1 except that the phenol resin raw material was changed to the phenol resin raw material P and that 11 parts by mass of the foaming agent was added to 100 parts by mass of the mixture with the phenol resin raw material P mixed with the surfactant. Thus, a phenol resin foam was obtained.
• Table 2 and Table 3 show the characteristics and thermal conductivity evaluation results of the obtained phenolic resin foam.

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