CN102559047B - Organosilicon coating and preparation method thereof - Google Patents
Organosilicon coating and preparation method thereof Download PDFInfo
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- CN102559047B CN102559047B CN201110440529.1A CN201110440529A CN102559047B CN 102559047 B CN102559047 B CN 102559047B CN 201110440529 A CN201110440529 A CN 201110440529A CN 102559047 B CN102559047 B CN 102559047B
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Abstract
The invention belongs to the field of organosilicon, and particularly relates to an organosilicon coating and a preparation method thereof. The organosilicon coating is characterized in that the organosilicon coating comprises 90 to 120 parts of Alpha, Omega-dihydroxy polydimethylpolysiloxane, 10 to 30 parts of MQ resin, 10 to 30 parts of white carbon black, 0.3 to 1 part of vulcanization accelerators, 2 to 3 parts of methyl-tri-(butanone-oxime) silane, 2 to 3 parts of vinyl tributanoximo silane, 1 to 3 parts of propylamino triethoxy silane, 1 to 2 parts of 3-glycidyl ether oxypropyl trimethoxysilane and 70 to 90 parts of solvent. The preparation method comprises the steps of raw material selection, raw material weighing, rubber compound drying, rubber compound preparation, and the like. The organosilicon elastic coating disclosed by the invention has low viscosity and high fluidity, can be rapidly self-leveled and filled after being coated, has a high curing speed at room temperature, needs short surface drying time and curing time, has excellent electric insulation performance, high strength, low hardness, high elasticity and good toughness after being cured, has self-repairing performance and an elongation percentage reaching 200 to 500 percent, has good bonding performance, has shear strength of 2 to 5MPa over aluminum, has little odor, cannot corrode a matrix, adopts solvent oil as the solvent, can effectively insulate and protect the surfaces of printed circuit boards (PCB) and electronic devices, and can also used as other elastic coatings needing insulation performance and anticorrosion performance.
Description
Technical field
The invention belongs to field of organic silicon, relate in particular to a kind of organosilicon coating and preparation method thereof.
Background technology
In electronic product, printed circuit board (being pcb board) is the interconnective main carriers of realizing between various electronic devices and components.On pcb board, be densely covered with conducting wire; surface-coated solder mask (be generally green or brown) and screen printing brush finish (being icon face); in the processing and use procedure of pcb board; to its surface carry out " three anti-" and insulation protection particularly important; and general crylic acid resin and polyurethanes insulation compound to solder mask bonding poor, hardness is high, poor flexibility; easily broken; and during great majority need, hot setting or UV solidify; in a lot of occasions, especially should not operate when large-area construction.
Along with the develop rapidly of electronic information industry; printed circuit board (being PCB or PWB plate) and various electronic devices and components are tending towards precise treatment, high performance and production and application automatization; insulation protection processing is carried out in its surface more and more important, the material requirements that it is processed to use is also more and more higher.With respect to other rubber or resin material, a kind of self cure, easy to use, low viscosity, there is good electrical insulating property, snappiness, self-repairability, high-intensity organosilicone elastic coating after solidifying and more can meet the service requirements of electronic devices and components and pcb board.
Abroad; be used for research and the comparatively maturation of application of the organosilicone elastic coating of electronic product industry; 1C49LV, 1C51,1C49,1C55, the 1C53 producing as: Humiseal company of the U.S. is the three anti-glue for electronic circuit and components and parts waterproof, protection against the tide, mildew-resistant, antirust, insulation, protection use; the DC1-2577 that the manufacturing giant's Dow corning of world's silicon rubber company produces; but its also defect to some extent aspect soft, high tenacity, and imported product price is high.At home, there are some research and application for the weather-proof waterproof type organosilicon coating of building materials aspect, but research and application for the surface-treated single-component room temperature vulcanized organosilicon elastic coating of electronic product industry, particularly pcb board and electronic devices and components are still few.Along with further developing of electronic product industry, organosilicone elastic coating needs further to be developed in the application in electronic product field.
Ketoxime removing type organosilicone elastic coating, because the aromatic hydrocarbon such as replacement benzene,toluene,xylene such as adopting solvent oil or sherwood oil make solvent, it is solvent oil volatilization in sulfidation, emit ketoxime, be neutral, low smell, except copper being had slight corrosion, to other base material non-corrosiveness, bonding wide, be specially adapted to electron trade, automobile industry, household electric appliances.
In the time applying pcb board and electronic devices and components, can adopt brushing, spraying, dip-coating, four kinds of operating procedures of equipment Selective coating, all need a kind of product with low viscosity, low smell, fast levelling, the characteristic such as fast curing, corrosion-free, and the domestic and international exploitation that also there is no this product.
The anti-paint of pcb board three using both at home and abroad mainly contains crylic acid resin, polyurethanes and silicone based insulation compound.Acrylic acid or the like insullac is the three anti-paints that generally use in the market, has advantages of surface drying quick solidifying, but higher, the poor toughness of hardness of paint film after solidifying, and weather resisteant and resistant of high or low temperature can not show a candle to organosilicone elastic coating; The anti-paint of polyurethanes three has good low temperature resistant, resistance to solvent and moisture resistivity, but paint film embrittlement, weathering resistance and high thermal resistance can not show a candle to silicone based elastic coating; Acrylic acid or the like and the anti-paint of polyurethanes three are mainly used the fragrant same clan, ester class, and ketone is as solvent, as: toluene, ethyl acetate, acetone, turps, hexanaphthene, these solvent toxicity are larger, after volatilization, HUMAN HEALTH and environment damaged to some extent.The existing RTV-1 type organosilicon coating putting goods on the market, be with in low viscous α, alpha, omega-dihydroxy polydimethyl siloxane is that base glue, organotin inner complex are catalyzer, methyl tributanoximo silane, vinyl tributyl ketoximyl silane be as linking agent, the third amino triethoxyl silane tackifier, add filler, solvent is formulated.Mainly there are 4 problems in the product that this formula is made: 1, surface drying time is long, and inside solidification speed is slow, affects client and use; 2, while use as three anti-paints, bad to institute's contact substrate cementability, easily peel off; 3, product forms paint film intensity is lower, elasticity is poor, hardness is higher, finally causes toughness poor, in use easily broken; 4, contain part aromatic solvents, toxicity is larger.
For this reason, the problem that solution RTV-1 organosilicon coating application aspect faces becomes the major objective of research and development, shows: 1, improve the vulcanization rate of RTV-1 organosilicon coating, shorten surface drying time and set time; 2, improve the cementability of coating to base material; 3, gain in strength, reduce hardness, improve toughness; 4, use the solvent of low smell low toxicity.
Along with scientific and technological development, electronics is integrated more and more higher, the preparation of precise electronic components and parts is used more and more extensive, pcb board has been widely used in various electronic integrated circuits, Auto Electronic Controlled System, household appliances manufacturing, covering in pcb board and electronic devices and components piece process, in order to reach satisfied performance, need product to there is following character:
1, meet the required low viscosity of coating processes: viscosity is excessive, and after coating, levelling property is poor, can not flow to certain area, and cause coating thickness blocked up after coating surface drying, and usage quantity increases, and causes unnecessary waste; So this kind of tailor-(made) coating need to reach low viscosity: 500-1200 mPa.s/25 ℃; High trickling: can Fast Filling after coating, Self-leveling, can guarantee that coating can sprawl in use fast, filleting, in very narrow electronic devices and components gap, can also meet spraying application requirement simultaneously;
2, can fast setting under room temperature: as streamline production operation, for guaranteeing working efficiency, need this kind of tailor-(made) coating can be at ambient temperature, surface drying time is at 10-30 minute (25 ℃, 50 %), just admittedly time 5-15 hour (25 ℃, 50 %), if can not fast setting, can cause the waste of plenty of time in workflow, affect production efficiency;
3, product meet the requirement of environmental protection: be to construct in workshop because apply construction, product should be selected neutral de-ketoxime system, selects the solvent of low smell low toxicity;
4, good to substrate bonding: the cementability good to base material, after guarantee coating curing, be difficult for being stripped from, play protection insulating effect;
5, solidify after coating high tenacity: only have solidify after strength of coating high, hardness is low, elongation good, the toughness of coating is better, is in use difficult for damaged.
Therefore, a kind of exploitation of room temperature vulcanization organosilicon elastic coating of easy to use, high performance-price ratio necessitates.
Summary of the invention
For solving above technical problem, the present invention is directed to the demand of electron trade, this patent provides a kind of ketoxime removing type, low viscosity, high tenacity, high strength, fast curing, good, easy to use to substrate bonding organosilicone elastic coating.
The present invention solves the organosilicone elastic coating that above technical problem provides, and it is characterized in that: α, 90 ~ 120 parts of (notes: portion rate used of alpha, omega-dihydroxy polydimethyl siloxane, be mass ratio), 10 ~ 30 parts of MQ resins, 10 ~ 30 parts of white carbon blacks, 0.3 ~ 1 part of vulcanization accelerator, 2 ~ 3 parts of methyl tributanoximo silanes, 2 ~ 3 parts of vinyl tributyl ketoximyl silanes, the third 1 ~ 3 part of amino triethoxyl silane, 1 ~ 2 part of 3-glycidyl ether oxygen propyl trimethoxy silicane,, 70 ~ 90 parts of solvents.
As improvement of the present invention, α, alpha, omega-dihydroxy polydimethyl siloxane viscosity=500 ~ 100000 mPa.s/25 ℃, white carbon black is thermal silica or precipitated silica, and solvent is solvent oil or sherwood oil, and wherein solvent oil is 120# or 200# solvent oil; The boiling range of sherwood oil is 90～120 ℃ or 120～150 ℃.Solvent is dry through Calcium Chloride Powder Anhydrous, in solvent, adds 2% Calcium Chloride Powder Anhydrous, leaves standstill 20-24h and processes with anhydrous cupric sulfate detection, not moisture dry qualified in solvent oil.
Vulcanization accelerator in the present invention is formulated by organotin and tetraethoxy, mix with 1:3～7 with tetraethoxy by organotin, be mixed with vulcanization accelerator, wherein tetraethoxy is Si28 or Si40, and organotin is organic carboxyl acid tin or organotin inner complex.
Select viscosity at the α of 500 ~ 100000mPa.s/25 ℃, alpha, omega-dihydroxy polydimethyl siloxane, add Nano carbon white and MQ resin, take methyl tributanoximo silane and vinyl tributyl ketoximyl silane as linking agent, vulcanization accelerator is as catalyzer, the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane are tackifier, solvent oil or sherwood oil are as solvent, select suitable technique to be mixed with low viscosity, high tenacity, high strength, fast solidifying, good to substrate bonding, organosilicone elastic coating easy to use, to meet the need of market.
Organosilicone elastic coating preparation method of the present invention, comprises the following steps:
(1) material choice and weighing: α, 90 ~ 120 parts of alpha, omega-dihydroxy polydimethyl siloxanes, 10 ~ 30 parts of MQ resins, 10 ~ 30 parts of white carbon blacks, 0.3 ~ 1 part of vulcanization accelerator, 1 ~ 2 part of 1 ~ 3 part of 2 ~ 3 parts of methyl tributanoximo silane, 2 ~ 3 parts of vinyl tributyl ketoximyl silanes, the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane;
(1) sizing material is dry: by α, alpha, omega-dihydroxy polydimethyl siloxane, MQ resin, white carbon black is mediated evenly in kneader, again sizing material is transferred on three-roller and milled, transfer in drying kettle after evenly and heat up and stir, keep sizing material temperature at 100 ~ 150 ℃, vacuum tightness >=0.085 Mpa, stirring vacuumizes dry 2 ~ 4 hours, airtight stand-by.
(2) preparation of sizing material: dried sizing material drops in planet stirring still, airtight cooling within the scope of 30 ~ 50 ℃ time until sizing material, add vulcanization accelerator, methyl tributanoximo silane, vinyl tributyl ketoximyl silane, the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane, high-speed stirring 20 ~ 30 minutes, add 70 ~ 90 parts of solvents, stir 20 ~ 30min.
Organosilicone elastic coating viscosity of the present invention low (500-1200 mPa.s/25 ℃); Good fluidity, Self-leveling, filling fast after coating; Under room temperature, curing speed is fast, surface drying time 10-30 min(25 ℃, 50 %), just consolidate time 5-15 h(25 ℃, 50 %); High strength, tensile strength 2-5Mpa; Soft (15-30 HA), snappiness, good toughness, elongation 200-500%; Cementability is good, to aluminium shearing resistance 2-5Mpa; Corrosion-free to base material, adopt solvent oil or sherwood oil to make solvent, low smell, can effectively insulate and conservation treatment to pcb board and electronic devices and components surface.
Organosilicone elastic coating of the present invention is coated in behind the surface of pcb board or electronic devices and components, and along with the volatilization of solvent, the moisture under normal temperature in ingress of air is cured as elastomerics voluntarily ,-60～+ 200
0c temperature range is long-term keeps good electric insulating quality, resistance to chemical attack, hydrophobic nature, weather resisteant energy and high strength, high tenacity, nontoxic non-corrosiveness, storage period length, easy construction, feature that comprehensive cost is low, and as external insulation, protection against corrosion, protection against the tide, shockproof, the waterproof paint of electronic circuit board, electronic devices and components, to meet the demand of electronic industry, meanwhile, for room temperature vulcanization organosilicon elastic coating is explored a good platform is provided in the application in electronics, automobile, the field such as medical.
The present invention completes by following reaction mechanism:
This reaction adopts the ketoxime type silane coupling agent of trifunctional as the linking agent of silicon rubber, and organotin is as catalyzer, and the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane are as tackifier, and solvent oil or sherwood oil are as solvent.In this product sulfidation, solvent evaporates, viscosity increases gradually, form film, be coated on base material, meanwhile, the moisture content in the silane coupling agent ingress of air in film and rapidly hydrolysis, under the promotion of catalyzer, the active terminal hydroxy group generation of linking agent and organosilicon polymer condensation reaction, sloughs the low-molecular material that reaction generates, and hydrolysis-condensation-de-low-molecular material chain reaction is progressively carried out, finally be formed with the cross-linked network of organosilicon polymer, realize the cross-linking vulcanized of organosilicon coating coating.
Accompanying drawing explanation
The following drawings is that the present invention is further detailed
Accompanying drawing 1 is sizing material drying process figure of the present invention
Accompanying drawing 2 is sizing material preparation technology figure of the present invention (note: the linking agent mixture in this schema refers to: vulcanization accelerator, linking agent, these three kinds of load weighted mixtures of tackifier.）
Embodiment
Embodiment 1
Select full-bodied α, 90 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity is at 500mPa.s/25 ℃, 10 parts of MQ resins, 10 parts of thermal silicas, in kneader, mediate evenly, sizing material is transferred on three-roller and milled, transfer to again in drying kettle after evenly and heat up and stir, keep sizing material temperature under 100 ℃, vacuum tightness=0.085 Mpa state, stirring vacuumizes dry 2 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 30 ℃ time until sizing material, add 0.3 part of the vulcanization accelerator that organotin is mixed with, 2 parts of 2 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, the third 1 part of amino triethoxyl silane and 1 part of alkane of 3-glycidyl ether oxygen propyl trimethoxy silicon, high-speed stirring 20 minutes, adds 70 parts of the 120# solvent oils of drying treatment, stir 20min, obtain organosilicone elastic coating.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si28=1:3.
Embodiment 2
Select full-bodied α, 110 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity 60000mPa.s/25 ℃, 20 parts of MQ resins, 15 parts of thermal silicas, in kneader, mediate evenly, sizing material is transferred on three-roller and milled, transfer to again in drying kettle after evenly and heat up and stir, keep sizing material temperature under 130 ℃, vacuum tightness=0.090 Mpa state, stirring vacuumizes dry 3 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 40 ℃ time until sizing material, add 0.6 part of the vulcanization accelerator that organotin is mixed with, 2.3 parts of 2.3 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, 1.5 parts of the third 2 parts of amino triethoxyl silanes and 3-glycidyl ether oxygen propyl trimethoxy silicanes, high-speed stirring 25 minutes, adds the 200# industrial naptha of 80 parts of drying treatment, stir 25min, obtain organosilicone elastic coating.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si28=1:5.
Embodiment 3
Select full-bodied α, 120 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity is at 100000 mPa.s/25 ℃, 30 parts of MQ resins, 30 parts of precipitated silicas, in kneader, mediate evenly, sizing material is transferred on three-roller and milled, transfer to again in drying kettle after evenly and heat up and stir, keep sizing material temperature under 150 ℃, vacuum tightness=0.095 Mpa state, stirring vacuumizes dry 4 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 50 ℃ time until sizing material, add 1 part of the vulcanization accelerator that organotin is mixed with, 3 parts of 3 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, 1 part of the third 3 parts of amino triethoxyl silanes and 3-glycidyl ether oxygen propyl trimethoxy silicane, high-speed stirring 30 minutes, adds 90 parts of the 200# industrial napthas that drying treatment crosses, stir 30min, obtain organosilicone elastic coating.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si28=1:7.
Embodiment 4
Select full-bodied α, 90 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity is at 500mPa.s/25 ℃, 10 parts of MQ resins, 10 parts of precipitated silicas, in kneader, mediate evenly, sizing material is transferred on three-roller and milled, transfer to again in drying kettle after evenly and heat up and stir, keep sizing material temperature under 100 ℃, vacuum tightness=0.085 Mpa state, stirring vacuumizes dry 2 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 30 ℃ time until sizing material, add 0.3 part of the vulcanization accelerator that organotin is mixed with, 2 parts of 2 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, the third 1 part of amino triethoxyl silane and 1 part of alkane of 3-glycidyl ether oxygen propyl trimethoxy silicon, high-speed stirring 20 minutes, adds 70 parts of the 90# sherwood oils of drying treatment, stir 20min, obtain organosilicone elastic coating.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si40=1:3.
Embodiment 5
Select full-bodied α, 120 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity is at 100000 mPa.s/25 ℃, 30 parts of MQ resins, 30 parts of precipitated silicas, in kneader, mediate evenly, sizing material is transferred on three-roller and milled, transfer to again in drying kettle after evenly and heat up and stir, keep sizing material temperature under 150 ℃, vacuum tightness=0.095 Mpa state, stirring vacuumizes dry 4 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 50 ℃ time until sizing material, add 1 part of the vulcanization accelerator that organotin is mixed with, 3 parts of 3 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, 2 parts of the third 1 part of amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicanes, high-speed stirring 30 minutes, adds 90 parts of the 120# sherwood oils that drying treatment crosses, stir 30min, obtain organosilicone elastic coating.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si40=1:7.
Embodiment 6: the preparation of reference substance 1:
Select low viscous α, 110 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity 1500 mPa.s/25 ℃, join in drying kettle and heat up and stir, keeping sizing material temperature is under 0.090 Mpa state at 130 ℃, vacuum tightness, stirs and vacuumizes dry 3 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 40 ℃ time until sizing material, add 0.6 part of the vulcanization accelerator that organotin is mixed with, 2.3 parts of 2.3 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, 1.5 parts of the third 2 parts of amino triethoxyl silanes and 3-glycidyl ether oxygen propyl trimethoxy silicanes, high-speed stirring 25 minutes, adds 80 parts of the 120# industrial napthas of drying treatment, stir 25min, obtain reference substance 1.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si28=1:5.
Embodiment 7: the preparation of reference substance 2:
Select full-bodied α, 110 parts of alpha, omega-dihydroxy polydimethyl siloxanes, viscosity is at 60000 mPa.s/25 ℃, 15 parts of thermal silicas are mediated evenly in kneader, and sizing material is transferred on three-roller and milled, evenly, transfer to again in drying kettle and heat up and stir, keep sizing material temperature under 130 ℃, vacuum tightness=0.090 Mpa state, stir and vacuumize dry 3 hours, airtight stand-by.
Dried sizing material is dropped in planet stirring still, airtight cooling within the scope of 40 ℃ time until sizing material, add 0.6 part of the vulcanization accelerator that organotin is mixed with, 2.3 parts of 2.3 parts of methyl tributanoximo silanes and vinyl tributyl ketoximyl silanes, 1.5 parts of the third 2 parts of amino triethoxyl silanes and 3-glycidyl ether oxygen propyl trimethoxy silicanes, high-speed stirring 25 minutes, adds 80 parts of the 120# industrial napthas of drying treatment, stir 25min, obtain reference substance 2.Wherein, vulcanization accelerator be formulated as organotin: tetraethoxy Si28=1:5.
Performance Detection:
Tensile strength and elongation at break are measured: the coating preparing is poured into Self-leveling in the hopper of horizontal positioned, make the film that mean thickness is 1 mm to 2mm, self cure 7d, the film vulcanizating is cut into dumbbell shaped batten with sampling machine, test its tensile strength and elongation at break with reference to GB/T 528-1998 standard with almighty test machine, rate of extension is 50 mm/min;
Surface drying time is measured: coating surface drying test, and ballotini method, with reference to GB/T 6753.3-86 standard;
The testing method of hardness: with reference to GB/T 531-1999 standard;
Fineness testing method: with reference to GB/T 1724-79 standard;
Viscosity test standard: be placed in 3h under 25 ℃ of conditions by airtight product, guarantee that the temperature of product is 25 ± 1 ℃, get appropriate product in sampling cup, with reference to GB/T 1723-93 viscosity test standard, test its rotary viscosity with rotational viscosimeter.
Solid content testing method: with reference to GB/T 1725-79 standard;
Method for testing shear strength: adopt vulcanized rubber and metal sticking tensile shear strength measuring method, with reference to GB/T 13936-92 standard;
In addition, just the testing standard of time is admittedly:
Just admittedly time test standard: at 25 ℃, under 60 % conditions, accurate weighing product 5 ± 0.2 g, on the sheet glass of horizontal positioned, allow after its Self-leveling and start timing, substantially solidify and have the required time of certain elasticity to silicon rubber, consolidate the time at the beginning of being.
This coating is owing to containing a certain amount of solvent, in the process that is solidified into film, first, this coating is Self-leveling fast, and solvent can volatilize away completely in surface drying time, simultaneously, improve operating efficiency, viscosity controller is at 500-1200 mPa.s/25 ℃, and surface drying time can not be less than 10min, can not be greater than 30min, just consolidate time 5-15 h.
Organosilicone elastic coating in the present invention and reference substance comparison:
Organosilicone elastic coating in table 1 the present invention and reference substance Performance Ratio are
Can find out: reference substance 1# does not add any reinforcing filler, and transparency is better, but viscosity, hardness, elongation, tensile strength and shearing resistance are all seriously on the low side, toughness is obviously poor than product, do not meet snappiness, soft, high-intensity requirement, have no value for use; Reference substance 2# viscosity is higher, and tensile strength and shearing resistance are all on the low side, does not meet high strength, low viscous requirement; Only have the organosilicone elastic coating indices in the present invention to meet the requirements.
The over-all properties of the organosilicone elastic coating in the present invention:
The performance of table 2 organosilicone elastic coating
Claims (4)
1. an organosilicone elastic coating, it is characterized in that: α, 90 ~ 120 parts of alpha, omega-dihydroxy polydimethyl siloxanes, 10 ~ 30 parts of MQ resins, 10 ~ 30 parts of white carbon blacks, 0.3 ~ 1 part of vulcanization accelerator, 2 ~ 3 parts of methyl tributanoximo silanes, 2 ~ 3 parts of vinyl tributyl ketoximyl silanes, the third 1 ~ 3 part of amino triethoxyl silane, 1 ~ 2 part of 3-glycidyl ether oxygen propyl trimethoxy silicane, 70 ~ 90 parts of solvents; Wherein, vulcanization accelerator is that organotin is mixed with 1:3～7 with tetraethoxy, is mixed with vulcanization accelerator, and wherein tetraethoxy is Si28 or Si40, and organotin is organic carboxyl acid tin or organotin inner complex; Solvent is solvent oil or sherwood oil, and wherein solvent oil is 120# or 200# solvent oil, and the boiling range of sherwood oil is 90～120 ℃ or 120～150 ℃; Organosilicone elastic coating has following steps to make:
(1) material choice and weighing: α, 90 ~ 120 parts of alpha, omega-dihydroxy polydimethyl siloxanes, 10 ~ 30 parts of MQ resins, 10 ~ 30 parts of white carbon blacks, 0.3 ~ 1 part of vulcanization accelerator, 1 ~ 2 part of 1 ~ 3 part of 2 ~ 3 parts of methyl tributanoximo silane, 2 ~ 3 parts of vinyl tributyl ketoximyl silanes, the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane;
(1) sizing material is dry: by α, alpha, omega-dihydroxy polydimethyl siloxane, MQ resin, white carbon black is mediated evenly in kneader, again sizing material is transferred on three-roller and milled, transfer in drying kettle after evenly and heat up and stir, keep sizing material temperature at 100 ~ 150 ℃, vacuum tightness >=0.085 Mpa, stirring vacuumizes dry 2 ~ 4 hours, airtight stand-by;
(2) preparation of sizing material: dried sizing material drops in planet stirring still, airtight cooling within the scope of 30 ~ 50 ℃ time until sizing material, add vulcanization accelerator, methyl tributanoximo silane, vinyl tributyl ketoximyl silane, the third amino triethoxyl silane and 3-glycidyl ether oxygen propyl trimethoxy silicane, high-speed stirring 20 ~ 30 minutes, add 70 ~ 90 parts of solvents, stir 20 ~ 30min.
2. organosilicone elastic coating according to claim 1, is characterized in that: α, alpha, omega-dihydroxy polydimethyl siloxane viscosity=500 ~ 100000 mPa.s/25 ℃.
3. organosilicone elastic coating according to claim 1, is characterized in that: white carbon black is vapor phase process or precipitated silica.
4. organosilicone elastic coating according to claim 1, is characterized in that: solvent is through drying treatment, and drying method is: in solvent oil, add 2% Calcium Chloride Powder Anhydrous, leave standstill 20-24h.
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