Classifications

• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L83/00—Compositions of macromolecular compounds obtained by reactions forming in the main chain of the macromolecule a linkage containing silicon with or without sulfur, nitrogen, oxygen or carbon only; Compositions of derivatives of such polymers
  • C08L83/04—Polysiloxanes
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
  • C08K9/00—Use of pretreated ingredients
  • C08K9/10—Encapsulated ingredients
• • 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
  • C08G77/06—Preparatory processes
• • 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
  • C08G77/12—Polysiloxanes containing silicon bound to hydrogen
• • 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
  • C08G77/20—Polysiloxanes containing silicon bound to unsaturated aliphatic groups
• • C—CHEMISTRY; METALLURGY
  • C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
  • C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
  • C08L2312/00—Crosslinking

Definitions

• the present invention relates to a silicone rubber composition and a crosslinked silicone rubber, and more particularly to a silicone rubber composition excellent in storage stability and crosslinking reactivity and a crosslinked silicone rubber obtained using the same.
• Patent Documents 1 and 2 use a thermoplastic resin fine particle catalyst composed of fine particles of a thermoplastic resin containing a crosslinking catalyst in a heat-curable organic polymer composition to ensure storage stability before curing. It is described.
• JP 2000-159896 A Japanese Patent Application Laid-Open No. 09-67440
• the problem to be solved by the present invention is to provide a silicone rubber composition excellent in storage stability in a mixed state and crosslinking reactivity during heating, and a crosslinked silicone rubber obtained using the same.
• a silicone rubber composition according to the present invention contains (a) an organopolysiloxane, (b) a crosslinking agent, and (c) a microcapsule-type catalyst comprising resin fine particles enclosing a crosslinking catalyst,
• the gist of the resin (c) is a solubility parameter of 7.9 or more, a thermal conductivity of 0.16 W / m ⁇ K or more, and a glass transition temperature of 40 to 145 ° C.
• the resin (c) is preferably at least one of an epoxy resin, an acrylic resin, a polyvinyl butyral resin, and a styrene polymer.
• the resin (c) preferably has a glass transition temperature of 40 to 85 ° C.
• the resin (c) preferably has a solubility parameter of 8.3 or more.
• the resin (c) preferably contains an acrylic resin, and the acrylic resin is preferably a copolymer of ethyl methacrylate and methyl methacrylate.
• the resin (c) preferably contains a styrene polymer, and the styrene polymer is preferably a styrene / butadiene copolymer or a styrene / maleic anhydride copolymer.
• the gist of the crosslinked silicone rubber according to the present invention consists of the crosslinked silicone rubber composition.
• the resin of the resin fine particles enclosing the crosslinking catalyst has a solubility parameter of 7.9 or more, a thermal conductivity of 0.16 W / m ⁇ K or more, and a glass transition temperature of 40 to 145 ° C. By being, it is excellent in the storage stability in a mixed state, and the crosslinking reactivity at the time of a heating.
• the glass transition temperature of the resin (c) is 40 to 85 ° C.
• the crosslinking reactivity at low temperature is excellent.
• the solubility parameter of the resin (c) is 8.3 or more, the storage stability in the mixed state is improved.
• the resin (c) contains an acrylic resin and the acrylic resin is a copolymer of ethyl methacrylate and methyl methacrylate, the glass transition temperature is low and the cross-linking reactivity during low-temperature heating is excellent.
• the thermal conductivity is high and crosslinking during heating Excellent reactivity.
• the silicone rubber composition according to the present invention contains (a) an organopolysiloxane, (b) a cross-linking agent, and (c) a microcapsule type catalyst composed of resin fine particles enclosing a cross-linking catalyst.
• Organopolysiloxane is (b) an organopolysiloxane having at least two functional groups crosslinked in one molecule by a crosslinking agent.
• organopolysiloxane alkenyl group-containing organopolysiloxane, hydroxyl group-containing organopolysiloxane, (meth) acryl group-containing organopolysiloxane, isocyanate-containing organopolysiloxane, amino group-containing organopolysiloxane, epoxy group-containing organopoly Examples thereof include siloxane.
• the alkenyl group-containing organopolysiloxane is used as a main raw material for addition-curable silicone rubber compositions.
• the alkenyl group-containing organopolysiloxane is crosslinked by a hydrosilyl crosslinking agent by an addition reaction with the hydrosilyl crosslinking agent. This addition reaction proceeds even at room temperature, but is accelerated under heating conditions.
• the temperature for carrying out the thermosetting by this addition reaction is usually more than 100 ° C., preferably in the range of 100 to 170 ° C.
• a platinum catalyst as a hydrosilylation catalyst is preferably used.
• the alkenyl group-containing organopolysiloxane preferably has at least two alkenyl groups in one molecule.
• Organopolysiloxane has an organic group.
• the organic group is a monovalent substituted or unsubstituted hydrocarbon group.
• unsubstituted hydrocarbon groups include methyl groups, ethyl groups, propyl groups, butyl groups, hexyl groups, alkyl groups such as dodecyl groups, aryl groups such as phenyl groups, ⁇ -phenylethyl groups, ⁇ -phenylpropyl groups, etc.
• an aralkyl group examples include a chloromethyl group and a 3,3,3-trifluoropropyl group.
• organopolysiloxanes having a methyl group as an organic group are frequently used for ease of synthesis.
• the organopolysiloxane is preferably linear, but may be branched or cyclic.
• alkenyl group include a vinyl group, an allyl group, a butenyl group, a pentenyl group, and a hexenyl group.
• the cross-linking agent is a cross-linking agent that cross-links (a) organopolysiloxane.
• the crosslinking agent include a hydrosilyl crosslinking agent, a sulfur crosslinking agent, and a peroxide crosslinking agent.
• the hydrosilyl crosslinking agent is used as a crosslinking agent for addition-curable silicone rubber compositions.
• the hydrosilyl crosslinking agent has a hydrosilyl group (SiH group) in its molecular structure.
• the hydrosilyl crosslinking agent is a hydrosilyl group-containing organopolysiloxane (organohydrogenpolysiloxane).
• the number of hydrosilyl groups in the molecular structure is not particularly limited, but is preferably in the range of 2 to 50 from the viewpoints of excellent curing speed and excellent stability.
• the hydrosilyl groups are preferably present in different Si.
• the polysiloxane may be a chain or a cyclic one.
• the hydrosilyl group-containing organopolysiloxane preferably has at least two hydrosilyl groups in one molecule.
• the hydrosilyl crosslinking agent preferably has a number average molecular weight in the range of 200 to 30000 from the viewpoint of excellent handleability.
• hydrosilyl group-containing organopolysiloxanes include trimethylsiloxy group-blocked methylhydrogenpolysiloxanes at both ends, trimethylsiloxy group-blocked dimethylsiloxane / methylhydrogensiloxane copolymers at both ends, Terminal dimethylhydrogensiloxy-blocked dimethylpolysiloxane, both ends dimethylhydrogensiloxy-blocked dimethylsiloxane / methylhydrogensiloxane copolymer, both ends trimethylsiloxy-blocked methylhydrogensiloxane / diphenylsiloxane copolymer, both ends trimethyl Siloxy group-blocked methylhydrogensiloxane / diphenylsiloxane / dimethylsiloxane copolymer, (CH 3 ) 2 HSiO1 / 2 unit and Si Examples thereof include a copolymer composed of
• the blending amount of the crosslinking agent is not particularly limited, but is usually in the range of 0.1 to 40 parts by mass with respect to 100 parts by mass of (a) organopolysiloxane.
• the crosslinking catalyst is a catalyst that promotes the crosslinking reaction of (a) organopolysiloxane by (b) a crosslinking agent.
• the crosslinking catalyst (c) include a platinum catalyst, a ruthenium catalyst, and a rhodium catalyst as hydrosilylation catalysts.
• the platinum catalyst include fine-particle platinum, platinum black, platinum-supported activated carbon, platinum-supported silica, chloroplatinic acid, an alcohol solution of chloroplatinic acid, an olefin complex of platinum, an alkenylsiloxane complex of platinum, and the like. These may be used alone or in combination of two or more.
• the resin (c) is for microencapsulating the crosslinking catalyst (c), and the crosslinking catalyst (c) is encapsulated in the resin (c).
• the resin containing the crosslinking catalyst is in the form of fine particles.
• the fine particles are solid at least at room temperature and have an average particle size of 30 ⁇ m or less.
• the average particle diameter is measured with a laser microscope.
• the average particle size of the resin fine particles (c) is preferably 10 ⁇ m or less from the viewpoint of enhancing the dispersibility of the crosslinking catalyst. More preferably, it is 5 ⁇ m or less. Moreover, it is preferable that it is 0.1 micrometer or more from a viewpoint of raising the fine particle collection rate at the time of preparation. More preferably, it is 2 ⁇ m or more.
• the resin (c) has a solubility parameter (SP value) of 7.9 or more, a thermal conductivity of 0.16 W / m ⁇ K or more, and a glass transition temperature (Tg) of 40 to 145 ° C. Thereby, it can be excellent in the storage stability in a mixed state, and the crosslinking reactivity at the time of a heating.
• the solubility parameter can be calculated from the molecular structure by the small calculation method.
• the thermal conductivity can be measured according to ASTM C177.
• the glass transition temperature can be measured by DSC (differential scanning calorimetry).
• the resin of (c) has a solubility parameter of 7.9 or more, and the solubility parameter of the silicone rubber that is the base polymer of the silicone rubber composition is a solubility parameter that greatly deviates, thereby reducing the compatibility with the silicone rubber and being stored. Can suppress dissolution or swelling of resin fine particles, suppress sustained release of the encapsulated crosslinking catalyst, and improve storage stability. By setting the solubility parameter to 8.3 or more, the compatibility with the silicone rubber can be further reduced, and the storage stability can be significantly improved.
• the resin (c) has a thermal conductivity of 0.16 W / m ⁇ K or higher, and is higher than the thermal conductivity of the silicone rubber that is the base polymer of the silicone rubber composition, so that it can be heated (during reaction).
• the melting rate of the resin can be increased to improve the crosslinking reactivity by improving the diffusibility of the crosslinking catalyst.
• the resin (c) has a glass transition temperature of 145 ° C. or less, and provides a difference between the heating temperature and the melting temperature of the resin, thereby speeding up the melting start time of the resin during heating (during reaction), and diffusion of the crosslinking catalyst.
• the crosslinking reactivity can be improved by increasing the amount. In this case, if the glass transition temperature is 100 ° C. or lower, or 85 ° C. or lower, for example, in the low-temperature crosslinking reaction at 120 ° C., the melting start time of the resin is shortened to improve the crosslinking reactivity by increasing the diffusion amount of the crosslinking catalyst. Therefore, it has excellent cross-linking reactivity at low temperatures.
• the glass transition temperature is set to 40 ° C. or higher so that the resin softens and melts at room temperature and does not impair the storage stability. More preferably, the glass transition temperature is 45 ° C. or higher, or 50 ° C. or higher.
• the resin (c) may be a thermoplastic resin or a thermosetting resin as long as it satisfies the above physical property values.
• a thermosetting resin is relatively preferable from the viewpoint of not deteriorating the compression set of the composition.
• epoxy resin epoxy resin, acrylic resin, polyvinyl butyral resin, styrene polymer, silicone resin, polycarbonate resin, polyester resin, unsaturated polyester resin, alkyd resin, urea resin, melamine resin, vinyl chloride resin
• examples include polyurethane resins, polyether sulfone resins, polysulfone resins, polyphenylene sulfide resins, phenol resins, diallyl phthalate resins, and polyvinyl alcohol resins. These may be used individually by 1 type as resin of (c), and may be used in combination of 2 or more type.
• the resin composition does not contain a nitrogen compound such as amine or amide, or a compound such as phosphorus or sulfur. Since each resin includes those having different solubility parameters and different glass transition temperatures within the same kind of material, even when any one of the resins is used alone as the resin of (c), materials having different physical property values are used. It can be adjusted to a predetermined physical property value in combination. Even when two or more of the above resins are used in combination as the resin (c), materials having different physical property values can be combined and adjusted to a predetermined physical property value.
• the acrylic resin includes both a polymer containing acrylate as a monomer and a polymer containing methacrylate as a monomer. Also included are polymers containing acrylate and methacrylate as monomers. Among these, from the viewpoint of maintaining a solid state at room temperature, a polymer containing acrylate and methacrylate as monomers, and a polymer containing only methacrylate as monomers are more preferable.
• the acrylic resin may be a homopolymer synthesized from a single monomer or a copolymer synthesized from two or more monomers as long as the above physical property values are satisfied. .
• the acrylic resin is preferably a copolymer from the viewpoint of easily adjusting the glass transition temperature to a low temperature of 100 ° C. or lower or 85 ° C. or lower.
• a copolymer of ethyl methacrylate and methyl methacrylate is particularly preferable from the viewpoint that the glass transition temperature can be lowered to 85 ° C. or lower.
• alkyl (meth) acrylate As acrylic monomers and methacrylic monomers, alkyl (meth) acrylate, cycloalkyl (meth) acrylate, halogenated alkyl (meth) acrylate, hydroxyl-containing (meth) acrylate, alkoxyalkyl (meth) acrylate, phenoxyalkyl (meth) acrylate And alkoxyalkylene glycol (meth) acrylate.
• alkyldiol di (meth) acrylate such as 1,9-nonanediol di (meth) acrylate
• polyethylene glycol di (meth) acrylate such as diethylene glycol di (meth) acrylate
• polypropylene such as dipropylene glycol di (meth) acrylate Glycol di (meth) acrylate
• trimethylolpropane tri (meth) acrylate pentaerythritol tri (meth) acrylate, pentaerythritol tetra (meth) acrylate
• glycerol tri (meth) acrylate ethylene glycol diglycidyl ether and unsaturated carboxylic acid Multivalent (meth) acrylates and glycidyl (meth) acrylates obtained by addition reaction of compounds with ethylenically unsaturated bonds such as unsaturated alcohols and active hydrogen
• Polyvalent (meth) acrylamides such as polyvalent (
• the styrenic polymer may be a single polymer synthesized from a single monomer, or may be synthesized from two or more monomers as long as the physical property values are satisfied. It may be a copolymer.
• the styrenic polymer is preferably a copolymer from the viewpoint of easily adjusting the thermal conductivity to 0.16 W / m ⁇ K or more.
• Styrene polymers include styrene-maleic anhydride copolymer (SMA), styrene-butadiene copolymer (SBS), styrene-isoprene copolymer (SIS), hydrogenated styrene-butadiene copolymer (SEBS). And hydrogenated styrene-isoprene copolymer (SEPS), styrene-acrylonitrile copolymer (SAN), acrylonitrile-butadiene-styrene copolymer (ABS), and the like.
• SMA styrene-maleic anhydride copolymer
• SBS styrene-butadiene copolymer
• SIS styrene-isoprene copolymer
• SEBS hydrogenated styrene-butadiene copolymer
• SEPS hydrogenated styrene-isoprene cop
• the microcapsule type catalyst can be produced by a conventionally known method. From the viewpoints of productivity, sphericity, and the like, suspension polymerization, emulsion polymerization, and submerged drying are preferred.
• the cross-linking catalyst is used as a solid core material, which is dispersed in an organic solvent that does not dissolve, and the monomer is suspended in this dispersion liquid, such as suspension polymerization method or emulsion polymerization method.
• the polymer covers the surface of the core material.
• a microcapsule catalyst in which the crosslinking catalyst is encapsulated in the resin fine particles is obtained.
• a crosslinking catalyst and a resin to be encapsulated are dissolved in an organic solvent insoluble in water, and this solution is dropped into an aqueous solution of a surfactant to produce an emulsion. Then, after reducing the pressure and removing the organic solvent, an encapsulated catalyst is obtained by filtration.
• the metal atom content of the cross-linking catalyst in the microcapsule type catalyst is preferably 5% by mass or less from the viewpoint of being sufficiently covered with a resin to ensure excellent storage stability. More preferably, it is 0.8 mass% or less. Moreover, it is preferable that it is 0.01 mass% or more from a viewpoint of ensuring the outstanding catalyst activity. More preferably, it is 0.3 mass% or more.
• the content of the (c) microcapsule catalyst in the composition depends on the content of the crosslinking catalyst in the (c) microcapsule catalyst, but the content of the crosslinking catalyst in the (c) microcapsule catalyst is the above-mentioned predetermined amount. When it is within the range, it can be within the range of 0.01 to 5.0 parts by mass with respect to 100 parts by mass of (a) organopolysiloxane.
• the cross-linking catalyst is a metal catalyst, the amount is usually in the range of 1 ppm to 1.0 part by mass in terms of metal amount with respect to 100 parts by mass of (a) organopolysiloxane.
• the silicone rubber composition according to the present invention includes a filler, a crosslinking accelerator, and a crosslinking retarder as long as the physical properties of the present invention and the silicone rubber are not impaired.
• General additives such as crosslinking aids, scorch inhibitors, anti-aging agents, softeners, heat stabilizers, flame retardants, flame retardant aids, UV absorbers, rust inhibitors, conductive agents, antistatic agents, etc. It may be added.
• the filler include reinforcing fillers such as fumed silica, crystalline silica, wet silica, and fumed titanium oxide.
• the silicone rubber composition according to the present invention can be prepared by mixing the components including the above (a) to (c).
• the silicone rubber composition according to the present invention is preferably liquid at room temperature from the viewpoint of moldability and the like. For this reason, it is preferable that at least (a) the organopolysiloxane is liquid at room temperature. Moreover, it is preferable that both (a) the organopolysiloxane and (b) the crosslinking agent are liquid at room temperature.
• the resin of the resin fine particles enclosing the crosslinking catalyst has a solubility parameter of 7.9 or more, a thermal conductivity of 0.16 W / m ⁇ K or more, and a glass transition temperature of 40. Since it is ⁇ 145 ° C., the storage stability in a mixed state and the cross-linking reactivity during heating are excellent. Further, when the glass transition temperature of the resin is 40 to 85 ° C., the cross-linking reactivity during low-temperature heating is excellent. Moreover, the storage stability in a mixed state improves that the solubility parameter of the said resin is 8.3 or more.
• the silicone rubber composition according to the present invention forms a crosslinked silicone rubber by thermosetting.
• the crosslinked silicone rubber according to the present invention comprises a crosslinked rubber of the silicone rubber composition according to the present invention.
• Examples 1 to 10, Comparative Examples 1 to 4 [Production of microcapsule type catalyst]
• a toluene solution of platinum catalyst (containing 3% by mass as platinum metal atoms), each coating resin used for atomization, and toluene are mixed at a ratio (mass ratio) of 0.6: 5: 95, and this solution is mixed with the surfactant. It was dripped at aqueous solution and the emulsion was produced. Thereafter, toluene was distilled off under reduced pressure, followed by filtration to obtain fine particles containing a coating resin and a platinum catalyst.
• Platinum catalyst Platinum (IV) acid, manufactured by Furuya Metal Co., Ltd. (coating resin) ⁇ Epoxy resin (dicyclopentadiene type epoxy resin): “HP7200H” manufactured by DIC ⁇ Acrylic resin 1 (PMMA): “Acrypet VH” manufactured by Mitsubishi Rayon ⁇ Acrylic resin 2 (PMMA): “Acrypet MF” manufactured by Mitsubishi Rayon Acrylic resin 3 (ethyl methacrylate-methyl methacrylate copolymer, EMA): “Hyperl M-4501” manufactured by Negami Kogyo -Polyvinyl butyral (PVB): Kuraray "Mowital B30HH” Styrene polymer 1 (styrene-butadiene copolymer, SBS): DAELIM K-RESIN (KR03) ⁇ Styrene polymer 2 (styrene-maleic anhydride copolymer, SMA): “SMA1000 resin” manufactured by Kawa Crude
• the resulting silicone rubber composition was evaluated for crosslinking reactivity and storage stability. The results are shown in Table 1.
• the solubility parameter (SP value), glass transition temperature (Tg), and thermal conductivity of the coating resin of the microcapsule catalyst were measured by the following methods.
• SP value Solubility parameter
• Glass transition temperature (Tg) Glass transition temperature (Tg)
• DSC measurement inspection scanning calorimetry
• Thermal conductivity was measured with a probe type thermal conductivity meter “QTM-3” manufactured by Kyoto Electronics Industry Co., Ltd. by a method based on ASTM C177.
• Crosslinking reactivity It measured at 170 degreeC and 120 degreeC with the curast meter. Here, the time until the torque reached 90% was measured as the crosslinking time. A cross-linking time of 40 seconds or less at a high temperature (170 ° C.) was evaluated as “good”, and a low temperature (120 ° C.) of 40 seconds or less was rated as “good”. A high temperature (170 ° C.) over 40 seconds was defined as a defective “x”.
• the viscosity (viscosity meter: TVB-10 type viscometer manufactured by Toki Sangyo Co., Ltd.) was measured after standing at room temperature and normal humidity for 1 week. Those with a viscosity increase rate of 50% or less were evaluated as “Good”, those with a viscosity increase rate of 30% or less as “Good”, and those cured with a viscosity increase rate exceeding 50% as “Poor”. .
• the SP value of the resin of the microcapsule type catalyst is less than 7.9, and the storage stability is poor.
• the microcapsule catalyst was blended into the mixture of organopolysiloxane and crosslinking agent, the curing of the mixture proceeded immediately, so that the crosslinking reactivity was not evaluated.
• the Tg of the resin of the microcapsule catalyst is too high and the crosslinking reactivity is poor.
• the thermal conductivity of the resin of the microcapsule type catalyst is poor and the crosslinking reactivity is poor.
• the SP value of the resin of the microcapsule type catalyst is 7.9 or more, Tg is 145 ° C.
• Example 9 it can be seen that when the SP value of the resin of the microcapsule type catalyst is 8.3 or more, the storage stability is further improved. Further, from comparison between Examples 2, 3, 7, and 8 and the other examples, it can be seen that when the Tg of the resin of the microcapsule catalyst is 85 ° C. or less, the crosslinking reactivity is further improved. From Examples 2 to 4, it can be seen that when the acrylic resin is a copolymer, Tg is lowered and crosslinking reactivity is improved. Moreover, from Example 6 and Comparative Example 4, it can be seen that when the styrene polymer is a copolymer, the thermal conductivity is improved and the crosslinking reactivity is improved.

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