CN101402798A - Heat conduction flame-proof liquid silicon rubber for electron and method of producing the same - Google Patents
Heat conduction flame-proof liquid silicon rubber for electron and method of producing the same Download PDFInfo
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- CN101402798A CN101402798A CNA2008102191012A CN200810219101A CN101402798A CN 101402798 A CN101402798 A CN 101402798A CN A2008102191012 A CNA2008102191012 A CN A2008102191012A CN 200810219101 A CN200810219101 A CN 200810219101A CN 101402798 A CN101402798 A CN 101402798A
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Abstract
The invention discloses a heat-conductive anti-flaming liquid silicone rubber used for electrons, which comprises the components with the following parts by weight: ethylene group dead-end organic polysiloxane which has polymer viscosity of 500 to 5000mPa.s and 10000 to 50000mPa.s when reaching 25 DEG C and has a general formula R2SiO(SiRR'O)nSiR2; hydric polysiloxane which has a general formula R'R2SiO(SiR HO)nSiR2R'; alkyldisilazane which has a general formula R3SiNHSiR3; a mixed-powder of Al2O3 and MgO with the surface hydrophobic particle size being respectively 5 Mum and 2 Mum and with the ratio of 4:1between Al2O3 and MgO; an Al(OH)3 powder which has an average particle size of 2 to 10 Mum; an additive solidified catalyst; an alkynol solidified inhibitor; and distilled water. The silicone rubber generates no toxic substance or irritative gas and has no side product and high efficiency; the product obtained is characterized by high thermal conductivity, good storage stability, moderate viscosity and good operability, and can integrate heat conduction, insulation and anti-flaming properties together, thereby meeting higher requirements of electrical appliances industry and having high cost performance.
Description
Technical field
The present invention relates to a kind of new type rubber material, especially be involved in the heat-conducting silicon rubber material of the heating components and parts heat transmission of CPU, mainboard, printer etc. in electronics, the electric equipment products.
Background technology
For solving the timely heat dissipation problem of thermoelectric device element occurred frequently when working, by material heat is passed to metal fin and reach the heat radiation purpose attached to the Heating element surface to guarantee its steady running. will have good heat conduction and insulating performance by the differentiate hot material like this.
Electronics is a kind of typical polymer composite with the heat conductive flame-retarding silastic material, accounts for critical role in thermally conductive material.Its heat conductivility mainly is that the distribution situation in the silicon rubber matrix determines by the kind of heat conductive filler and heat conductive filler.Metallic stuffing (as Al, Ag etc.) has higher thermal conductivity, but great majority are can heat conduction also conductive; Ceramic (as AlN, SiC etc.) thermal conductivity is also higher, but prices are rather stiff; Main at present use metal oxide is (as Al
2O
3, MgO, ZnO etc.) as heat conductive filler.The thermal conduction mechanism of various packing materials is all different, and metallic substance mainly is to carry out heat conduction by electron motion, and the metal heat-conducting rate reduces with the rising of temperature; Nonmetallic Speed of diffusion depends primarily on the vibrations and the conjugated group of contiguous atom, and in the material that strong covalent bond closes, heat conduction is more efficient in orderly crystal lattices.So when adopting non-metallic material as heat conductive filler, the heat conduction " degree of piling up " in the raising system is the main means that improve thermal conductivity.
Common heat-conducting silicon rubber is to add heat conductive filler to make in the silicon rubber of the high temperature vulcanized type of superoxide now.Common preparation process is to be divided into two stages to carry out, and the fs carries out silicon raw rubber, heat conductive filler, additive, vulcanizing agent and constitution controller mixing, and with mixing materials pressurized, heated moulding and sulfuration in metal die, its pressure is 50Kg/cm then
2About, 120～130 ℃ of service temperatures, the time is 20～30 minutes, perhaps service temperature is 160～170 ℃, 10～15 minutes time; Subordinate phase is put in people's baking oven after silicon rubber is taken out from mould, dries by the fire 24 hours down in 200～250 ℃, and rubber is further vulcanized, and makes organo-peroxide decompose volatilization simultaneously.
Adopt the method for preparing heat-conducting silicon rubber,, be unfavorable for reducing cost, and the filler in the rubber components, oil, oxidation inhibitor, resin may consume free radical under certain condition, need strict apolegamy because the rubber price is higher; The rubber item stretching and the tear strength that adopt the peroxide cure method to make are low, and curing time is difficult for adjusting, superoxide can discharge the irritating smell body during sulfuration, influences production environment, the curing temperature height, the mass consumption electric energy, the viscosity of product is very much not easy to operate, and because be polymer materials, inflammable, the amount of being fuming is big, is the direct safety fuse of fire sometimes.Said products can not satisfy electric elements to the high heat conduction of heat sink material, insulation, fire-retardant over-all properties requirement.
Summary of the invention
The purpose of this invention is to provide a kind of heat conduction flame-proof liquid silicon rubber for electron that the good advantage such as easy to operate of high thermal conductivity coefficient, viscosity is used for substituting traditional heat-conducting silicone grease, thermal conductive silicon cream and firm silicone rubber that has.
Another object of the present invention provides that a kind of vulcanization rate is fast, the preparation method of the heat conduction flame-proof liquid silicon rubber for electron of the Environmental Safety that economizes on resources.
Technical solution of the present invention is: a kind of heat conduction flame-proof liquid silicon rubber for electron, and it comprises the component of following weight part:
A), 10～40 parts of general formulas are R
2SiO (SiRR ' O)
nSiR
2The organopolysiloxane of ethenyl blocking, alkyl R that is connected with silicon in the chain link and R ' are methyl, ethyl, propyl group or butyl, polymerization viscosity is 500～5000mPa.s in the time of 25 ℃;
B), 10～40 parts of general formulas are R
2SiO (SiRR ' O)
nSiR
2The organopolysiloxane of ethenyl blocking, alkyl R that is connected with silicon in the chain link and R ' are methyl, ethyl, propyl group or butyl, polymerization viscosity is 10000～50000mPa.s in the time of 25 ℃;
C), 1～5 part general formula is R ' R
2SiO (SiR HO)
nSiR
2The hydrogen containing siloxane of R ', wherein R is methyl, ethyl, propyl group or butyl, and R ' is a hydrogen or alkyl, and polymerization viscosity is 20～150mPa.s in the time of 25 ℃;
D), 2～8 parts general formula is R
3SiNHSiR
3The alkyl disilazane, R is methyl, vinyl or phenyl;
E), the Al of 20～50 parts of surface hydrophobicities
2O
3With the MgO mixed powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, the ratio of the former with the latter is 4: 1;
F), 10～50 parts Al (OH)
3Powder, median size 2～10 μ m;
G), 0.3～2 part addition curing catalyzer;
H), 0.01～0.06 part alkynol class curing inhibitors;
I), 0.5～2 part distilled water.
As a kind of prioritization scheme, a kind of heat conduction flame-proof liquid silicon rubber for electron comprises the component of following weight part:
A), the polydimethylsiloxane of 10～40 parts of ethenyl blockings, polymerization viscosity is 500～5000mPa.s in the time of 25 ℃;
B), the polydimethylsiloxane of 10～40 parts of ethenyl blockings, polymerization viscosity is 10000～50000mPa.s in the time of 25 ℃;
C), 1～5 part of hydrogen containing siloxane, polymerization viscosity is 20～150mPa.s in the time of 25 ℃;
D), 2～8 parts of hexamethyldisilazanes;
E), the Al of 20～50 parts of surface hydrophobicities
2O
3With the MgO mixed powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter;
F), the Al (OH) of 10～50 parts of median size 2 μ m
3Powder;
G), 0.3～2 part platinum or platinic compound;
H), 0.01～0.06 part alkynol class curing inhibitors;
I), 0.5～2 part distilled water.
Al
2O
3, MgO mixed powder and Al (OH)
3The powder additional proportion is 3: 1～4: 1, Al
2O
3, the MgO powder is as heat conductive filler, Al (OH)
3Powder can reach isostatic heat conductive flame-retarding effect as fire-retardant filler according to such ratio adding.
Described platinum or platinic compound are alcoholic solution, Platinic chloride-paraffin complex compound or the platinum-vinylsiloxane complex compound of platinum black, Platinic chloride, Platinic chloride.Platinum or platinum complex have the good flame effect, cooperate Al (OH)
3Powder can further improve the flame retardant effect of sulfuration heat-conducting silicon rubber sheet.
The additional proportion of addition curing catalyzer and alkynol class curing inhibitors is 40: 1, can improve vulcanization rate, need not pressurization and post vulcanization process.
Described alkynol class curing inhibitors is 3-methyl-hexin base-3-alcohol, 3,5-dimethyl-1-hexin base-3-alcohol, 2-methyl-3-butynyl-2-alcohol or 2-phenyl-3-butynyl-2-alcohol.
Preparation method's method of heat-conducting anti-flaming liquid silicon rubber of the present invention may further comprise the steps:
A), polymerization viscosity is the organopolysiloxane of the ethenyl blocking of 500～5000mPa.s when adding 25 ℃ in kneader, polymerization viscosity is organopolysiloxane, alkyl disilazane and the distilled water of the ethenyl blocking of 10000～50000mPa.s 25 ℃ the time, mediate evenly;
B), add Al
2O
3With MgO mixed powder and Al (OH)
3Powder is mediated agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), under 150 ℃ of vacuum conditions, mediated 2 hours, stop vacuum, cooling makes basic glue after mediating evenly;
E), in basic glue, add hydrogen containing siloxane, addition curing catalyzer and alcohols curing inhibitors, obtain heat-conducting anti-flaming liquid silicon rubber after stirring, be warming up to 80～150 ℃ vulcanize goods.
Al among the step b
2O
3With MgO mixed powder and Al (OH)
3Add after powder mixes is even in batches, add at interval and be no less than 5 minutes.Can guarantee that uniform filling is distributed in the sizing material, improve the quality of rubber.
Vacuum condition is gauge pressure 0.08Mpa in the steps d, prevents that the alkyl disilazane from remaining in the sizing material, causes sizing material to show alkalescence, improves product stock stability.
The addition curing catalyzer that adds among the step e and the ratio of alcohols curing inhibitors are 40: 1, can improve vulcanization rate, need not pressurization and post vulcanization process.
The present invention has following advantage: do not produce toxic substance or irritant gas in production and the sulfidation, do not have by product, the efficient height; Vulcanization rate is fast, and energy consumption is few, saves manpower; Meet energy-saving and cost-reducing and environmental requirement.The product thermal conductivity height that makes, stability in storage is good, and the modest viscosity good operability the most important thing is and can well roll into one heat conduction, insulation, flame retardant properties to satisfy the higher demand of electrical apparatus industry, cost performance height.
Embodiment
Embodiment 1: a kind of heat conduction flame-proof liquid silicon rubber for electron, and its preparation process is as follows:
A), in kneader, add the polydimethylsiloxane that 10Kg polymerization viscosity is the ethenyl blocking of 500～5000mPa.s, polydimethylsiloxane, 2Kg hexamethyldisilazane, 0.5Kg distilled water and the 0.01Kg white powder that 10Kg polymerization viscosity is the ethenyl blocking of 10000～50000mPa.s under 25 ℃, mediate evenly;
B), the Al that mixes the 20Kg surface hydrophobicity
2O
3With MgO mixed powder and 10Kg particle diameter be the Al (OH) of 2 μ m
3Powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, add kneader in batches, each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, cooling makes basic glue after mediating evenly at 150 ℃;
E), 3-methyl-hexin base-3-alcohol of adding 1Kg hydrogen containing siloxane, 0.3Kg Platinic chloride-paraffin complex compound and 0.01Kg is curing inhibitors in basic glue, obtain white heat-conducting anti-flaming liquid silicon rubber after stirring, be warming up to 80～150 ℃ of sulfurations and got goods in 8 minutes.
Embodiment 2: a kind of heat conduction flame-proof liquid silicon rubber for electron, and its preparation process is as follows:
A), in kneader, add the yellow cream of poly-dipropyl siloxanes, 5Kg hexamethyldisilazane, 2Kg distilled water and 0.02Kg of poly-di-ethyl siloxane that 40Kg polymerization viscosity is the ethenyl blocking of 500～5000mPa.s, ethenyl blocking that 40Kg polymerization viscosity is 10000～50000mPa.s under 25 ℃, mediate evenly;
B), mix 50KgAl
2O
3With MgO mixed powder and 50Kg particle diameter be the Al (OH) of 10 μ m
3Powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, add kneader in batches, each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, be cooled to 120 ℃ and make basic glue after mediating evenly at 150 ℃;
E), in basic glue, add 3 of 1Kg hydrogen containing siloxane, 2Kg Platinic chloride and 0.06Kg, 5-dimethyl-1-hexin base-3-alcohol be curing inhibitors, obtains yellow heat-conducting anti-flaming liquid silicon rubber after stirring, be warming up to 80～150 ℃ vulcanize 5 minutes must goods.
Embodiment 3: a kind of heat conduction flame-proof liquid silicon rubber for electron, and its preparation process is as follows:
A), in kneader, add the polydimethylsiloxane that 25Kg polymerization viscosity is the ethenyl blocking of 500～5000mPa.s, the yellow cream of polydimethylsiloxane, 3.5Kg hexamethyldisilazane, 1Kg distilled water and 0.01Kg that 25Kg polymerization viscosity is the ethenyl blocking of 10000～50000mPa.s under 25 ℃, mediate evenly;
B), mix 30KgAl
2O
3With MgO mixed powder and 25Kg particle diameter be the Al (OH) of 5 μ m
3Powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, add kneader in batches, each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, be cooled to 120 ℃ and make basic glue after mediating evenly at 150 ℃;
E), 2-methyl-3-butynyl-2-alcohol of adding 3Kg hydrogen containing siloxane, 1Kg platinum-vinylsiloxane complex compound and 0.25Kg is curing inhibitors in basic glue, obtain heat-conducting anti-flaming liquid silicon rubber after stirring, be warming up to 80～150 ℃ of sulfurations and got goods in 5 minutes.
Embodiment 4: a kind of heat conduction flame-proof liquid silicon rubber for electron, and its preparation process is as follows:
A), to add 10Kg polymerization viscosity under 25 ℃ in kneader be the polydimethylsiloxane of the ethenyl blocking of 500～5000mPa.s, polydimethylsiloxane, 2Kg hexamethyldisilazane, 1Kg distilled water and the 0.01Kg diatomite that 10Kg polymerization viscosity is the ethenyl blocking of 10000～50000mPas, mediate evenly;
B), mix 40Kg Al
2O
3With MgO mixed powder and 10Kg particle diameter be the Al (OH) of 2 μ m
3Powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, add kneader in batches, each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, be cooled to 120 ℃ and make basic glue after mediating evenly at 150 ℃;
E), 2-phenyl-3-butynyl-2-alcohol of adding 1Kg hydrogen containing siloxane, 0.4Kg platinum-vinylsiloxane complex compound and 0.01Kg is curing inhibitors in basic glue, obtain heat-conducting anti-flaming liquid silicon rubber after stirring, be warming up to 80～150 ℃ of sulfurations and got goods in 5 minutes.
The product index that makes is:
Testing performance index value testing method
Density (g/cm3) 2.0-2.4 ASTM D792
Volume specific resistance (Ω .cm) 8.8 * 10
14ASTM D257
Mix viscosity (mPa.s) 20000-100000
Tensile strength (kgf/cm2) 3-6 ASTM D412
Temperature resistant range (℃)-45-200
Heat conductance 1.5-2.5W/ (m.k) ASTM E 1464-01
Hardness (spherical sclerometer) 10-55 ASTM D2240
Fire-retardant rank V-0 level UL 94
Below further specify beneficial effect of the present invention by experiment:
Contrast experiment's example 1:
1), in kneader, adds 100 parts of rubbers (viscosity 40～800,000 mPa.s), Al
2O
3With 400 parts of MgO mixed powders, 20 parts of basic glue of mixing one-tenth of magnesiumcarbonate powder;
2), in basic glue, add the superoxide that is commonly called as " two 25 ", mix homogeneous and be made into sizing material;
3), with mixing materials pressurized, heated moulding and sulfuration in metal die, its pressure is 50Kg/cm
2, 160～170 ℃ of temperature, obtain silicon rubber at 10～15 minutes time;
4), post vulcanization: silicon rubber is put into baking oven after taking out from mould, in 200～250 ℃ of baking sulfurations in 24 hours down, make contrast product 1.
Contrast experiment's example 2:
1), to add 10Kg polymerization viscosity under 25 ℃ in kneader be the polydimethylsiloxane of the ethenyl blocking of 500～5000mPa.s, polydimethylsiloxane, 2Kg hexamethyldisilazane, 1Kg distilled water and the 0.01Kg diatomite that 10Kg polymerization viscosity is the ethenyl blocking of 10000～50000mPa.s, mediate evenly;
2), mixing the 40Kg particle diameter is the Al of 5 μ m
2O
3Powder and 10Kg particle diameter are the Al (OH) of 5 μ m
3Powder adds kneader in batches, and each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
3, being warming up to 150 ℃ of constant temperature mediated 1 hour;
4), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, be cooled to 120 ℃ and make basic glue after mediating evenly at 150 ℃;
5), 2-phenyl-3-butynyl-2-alcohol of adding 1Kg hydrogen containing siloxane, 0.4Kg platinum-vinylsiloxane complex compound and 0.01Kg is curing inhibitors in basic glue, is warming up to 80～150 ℃ of sulfurations 5 minutes after stirring, and obtains contrast product 2.
Contrast experiment's example 3:
1), to add 10Kg polymerization viscosity under 25 ℃ in kneader be the polydimethylsiloxane of the ethenyl blocking of 500～5000mPa.s, polydimethylsiloxane, 2Kg hexamethyldisilazane, 1Kg distilled water and the 0.01Kg diatomite that 10Kg polymerization viscosity is the ethenyl blocking of 10000～50000mPa.s, mediate evenly;
2), mixing the 40Kg particle diameter is the Al of 5 μ m and 2 μ m
2O
3Mixed powder and 10Kg particle diameter are 2 microns Al (OH)
3Powder adds kneader in batches, and each interval is no less than 5 minutes, mediates agglomerating follow-up continuous at room temperature the kneading 1 hour;
3), being warming up to 150 ℃ of constant temperature mediated 1 hour;
4), vacuumize, mediated 2 hours under the gauge pressure 0.08Mpa condition, stop vacuum, be cooled to 120 ℃ and make basic glue after mediating evenly at 150 ℃;
5), 2-phenyl-3-butynyl-2-alcohol of adding 1Kg hydrogen containing siloxane, 0.4Kg platinum-vinylsiloxane complex compound and 0.01Kg is curing inhibitors in basic glue, is warming up to 80～150 ℃ of sulfurations 5 minutes after stirring, and obtains contrast product 3.
Extract the product of embodiment 2 and embodiment 4, carry out performance measurement respectively, result such as following table with contrast product:
As can be seen from the above table, preparation method of the present invention and the product that makes are compared contrast product 1, do not produce toxic substance or irritant gas in production and the sulfidation, do not have by product; Vulcanization rate is fast, the efficient height, and energy consumption is few; Meet energy-saving and cost-reducing and environmental requirement.The moderate good operability of the product viscosity that makes.Bulking property price ratio height; Compare contrast product 2, introduced the magnesium oxide heat conductive filler, its thermal conductivity will be got well than aluminum oxide, and the particle diameter difference, helps to improve degree of piling up, and the product thermal conductivity is significantly improved.At present domesticly do not find that also useful magnesium oxide does the report and the product of heat conductive filler, also do not have enterprise and produce the magnesium oxide that suitable heat conductive filler is used, this project both can improve the heat conductivility of product greatly to the introducing of magnesium hydroxide filler, can spur the market requirement of magnesium oxide heat conductive filler again; Compare contrast product 3, mainly embodied under the identical conditions, the heat conductivility difference of magnesium oxide heat conductive filler and aluminum oxide heat conductive filler has also been studied different-grain diameter and has just been arranged in pairs or groups to the influence of heat conductivility.
The Al that adds of embodiment 2 products in addition
2O
3With MgO mixed powder and Al (OH)
3Ratio be 1: 1, particle diameter is also bigger, compares in embodiment 4 products to add Al
2O
3With MgO mixed powder and Al (OH)
3Ratio 4: 1, particle diameter is also less, the former is not as the latter on heat conductivility, but the former over-all properties still is better than contrast product.
Claims (10)
1, a kind of heat conduction flame-proof liquid silicon rubber for electron is characterized in that: it comprises the component of following weight part:
A), 10～40 parts of general formulas are R
2SiO (SiRR ' O)
nSiR
2The organopolysiloxane of ethenyl blocking, alkyl R that is connected with silicon in the chain link and R ' are methyl, ethyl, propyl group or butyl, polymerization viscosity is 500～5000mPa.s in the time of 25 ℃;
B), 10～40 parts of general formulas are R
2SiO (SiRR ' O)
nSiR
2The organopolysiloxane of ethenyl blocking, alkyl R that is connected with silicon in the chain link and R ' are methyl, ethyl, propyl group or butyl, polymerization viscosity is 10000～50000mPa.s in the time of 25 ℃;
C), 1～5 part general formula is R ' R
2SiO (SiR HO)
nSiR
2The hydrogen containing siloxane of R ', wherein R is methyl, ethyl, propyl group or butyl, and R ' is a hydrogen or alkyl, and polymerization viscosity is 20～150mPa.s in the time of 25 ℃;
D), 2～8 parts general formula is R
3SiNHSiR
3The alkyl disilazane, R is methyl, vinyl or phenyl;
E), the Al of 20～50 parts of surface hydrophobicities
2O
3With the MgO mixed powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, the ratio of the former with the latter is 4: 1;
F), 10～50 parts Al (OH)
3Powder, median size 2～10 μ m;
G), 0.3～2 part addition curing catalyzer;
H), 0.01～0.06 part alkynol class curing inhibitors;
I), 0.5～2 part distilled water.
2, heat-conducting anti-flaming liquid silicon rubber according to claim 1 is characterized in that: it comprises the component of following weight part:
A), the polydimethylsiloxane of 10～40 parts of ethenyl blockings, polymerization viscosity is 500～5000mPa.s in the time of 25 ℃;
B), the polydimethylsiloxane of 10～40 parts of ethenyl blockings, polymerization viscosity is 10000～50000mPa.s in the time of 25 ℃;
C), 1～5 part of hydrogen containing siloxane, polymerization viscosity is 20～150mPa.s in the time of 25 ℃;
D), 2～8 parts of hexamethyldisilazanes;
E), the Al of 20～50 parts of surface hydrophobicities
2O
3With the MgO mixed powder, Al in the mixed powder
2O
3Be respectively 5 μ m and 2 μ m with the MgO particle diameter, the ratio of the former with the latter is 4: 1;
F), the Al (OH) of 10～50 parts of median size 2～10 μ m
3Powder;
G), 0.3～2 part platinum or platinic compound (pt content is 1000-8000PPM);
H), 0.01～0.06 part alkynol class curing inhibitors;
I), 0.5～2 part distilled water.
3, heat-conducting anti-flaming liquid silicon rubber according to claim 2 is characterized in that: Al
2O
3With MgO mixed powder and Al (OH)
3The powder additional proportion is 3: 1～4: 1.
4, heat conduction flame-proof liquid silicon rubber for electron according to claim 2 is characterized in that: described platinum or platinic compound are alcoholic solution, Platinic chloride-paraffin complex compound or the platinum-vinylsiloxane complex compound of platinum black, Platinic chloride, Platinic chloride.
5, heat conduction flame-proof liquid silicon rubber for electron according to claim 1 is characterized in that: the ratio of addition curing catalyzer and alkynol class curing inhibitors is 40: 1.
6, heat conduction flame-proof liquid silicon rubber for electron according to claim 1 and 2, it is characterized in that: described alkynol class curing inhibitors is 3-methyl-hexin base-3-alcohol, 3,5-dimethyl-1-hexin base-3-alcohol, 2-methyl-3-butynyl-2-alcohol or 2-phenyl-3-butynyl-2-alcohol.
7, a kind of method for preparing the described heat conduction flame-proof liquid silicon rubber for electron of claim 1, it is characterized in that: it may further comprise the steps:
A), polymerization viscosity is the organopolysiloxane of the ethenyl blocking of 500～5000mPa.s when adding 25 ℃ in kneader, polymerization viscosity is organopolysiloxane, alkyl disilazane and the distilled water of the ethenyl blocking of 10000～50000mPa.s 25 ℃ the time, mediate evenly;
B), add Al
2O
3With MgO mixed powder and Al (OH)
3Powder is mediated agglomerating follow-up continuous at room temperature the kneading 1 hour;
C), being warming up to 150 ℃ of constant temperature mediated 1 hour;
D), under 150 ℃ of vacuum conditions, mediated 2 hours, stop vacuum, cooling makes basic glue after mediating evenly;
E), in basic glue, add hydrogen containing siloxane, addition curing catalyzer and alcohols curing inhibitors, obtain heat conduction flame-proof liquid silicon rubber for electron after stirring, be warming up to 80～150 ℃ of sulfurations.
8, the preparation method of heat conduction flame-proof liquid silicon rubber for electron according to claim 7 is characterized in that: the Al among the step b
2O
3With MgO mixed powder and Al (OH)
3Add after powder mixes is even in batches, add at interval and be no less than 5 minutes.
9, the preparation method of heat conduction flame-proof liquid silicon rubber for electron according to claim 7 is characterized in that: vacuum condition is gauge pressure 0.08Mpa in the steps d.
10, the preparation method of heat conduction flame-proof liquid silicon rubber for electron according to claim 7 is characterized in that: the addition curing catalyzer that adds among the step e and the ratio of alcohols curing inhibitors are 40: 1.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102372925A (en) * | 2010-08-05 | 2012-03-14 | 天津莱尔德电子材料有限公司 | Heat conduction insulating material, heat conduction insulating strip and preparation method thereof |
| CN103146202A (en) * | 2013-03-18 | 2013-06-12 | 盐城菁华新材料科技有限公司 | Preparation method of liquid silicone rubber for packaging light-emitting diode |
| CN103834176A (en) * | 2014-01-29 | 2014-06-04 | 迈高精细高新材料（深圳）有限公司 | Method of preparing liquid silicone rubber |
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